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Tytuł:
Optimizing Body Machining Including Variable Casting Allowances
Autorzy:
Gessner, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1841423.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron geometry assessment
machining allowance
machining cost minimization
Opis:
The work contains the results of research conducted to optimize the machining of milling table castings. The possibility of reducing the total volume of machining allowances, reducing the wear of cutting tools, shortening machining time and eliminating idle machining passes was considered. The tests were carried out on two batches of castings supplied by two independent foundries. Casting geometry measurements were made using a structured light scanner. The analysis included machining with cemented carbide tools and tool ceramics at two machining centers: DMC200U and DMC270U. It has been shown that as a result of eliminating idle machining passes, it is possible to reduce machining time by 12% for the first and by 44% for the second casting supplier. The estimated annual savings for the production volume of 500 pcs of these castings can range from € 7388 to even € 23 346. The actual cost of cheaper casts was also calculated, taking into account the difference in machining cost resulting from larger machining allowances.
Źródło:
Management and Production Engineering Review; 2021, 12, 2; 65-74
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Płyny obróbkowe w obróbce skrawaniem – wybrane aspekty ich stosowania
Machining fluids in machining – selected aspect of their application
Autorzy:
Kowalczyk, Joanna
Madej, Monika
Powiązania:
https://bibliotekanauki.pl/articles/404395.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo AWART
Tematy:
machining
machining fluid
way of cooling
effectiveness of machining
płyny obróbkowe
chropowatość powierzchni
obróbka skrawaniem
Opis:
Machining fluids are commonly used in a wide range of machining application. In this paper numerous functions of these fluids and ways of increasing their effectiveness during machining were presented. The effect of different types of machining fluids on the roughness of the machined surface were also compared.
W szeroko rozumianej obróbce skrawaniem powszechnie używane są płyny obróbkowe. W artykule przedstawiono liczne funkcje tych płynów oraz sposoby zwiększania efektywności ich oddziaływania podczas obróbki. Porównano także efekty zastosowania różnych rodzajów płynów obróbkowych w aspekcie chropowatości obrabianej powierzchni.
Źródło:
Obróbka Metalu; 2019, 2; 34-37
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issues in machining of hollow core honeycomb sandwich structures by abrasive waterjet machining
Autorzy:
Devadula, S.
Nicolescu, M.
Powiązania:
https://bibliotekanauki.pl/articles/99450.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
abrasive waterjet
machining
honeycomb sandwich material
Opis:
Machining of hollow core honeycomb sandwich materials is a challenging job as the mechanical properties of various layers (skin, core) are quite dissimilar, and the conventional solid cutting tool experiences a sudden change of conditions while machining that might lead to damage on the tool/part. Although, abrasive waterjets (AWJs) is highly efficient in the machining of advanced composite materials due to their unique characteristics, efficient machining of sandwich structures by AWJs needs many challenges to be addressed. This work presents various issues observed in AWJ machining of carbon- and glass- fiber skin based, aluminum sandwich structure composite materials, and the limitations of AWJs in processing these exotic materials. Finally, possible strategies for efficient machining of honeycomb structures were proposed for future investigation.
Źródło:
Journal of Machine Engineering; 2013, 13, 1; 117-124
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precise model of HSC Machining Centre for aerospace parts machining
Autorzy:
Jedrzejewski, J.
Kwasny, W.
Kowal, Z.
Modrzycki, W.
Powiązania:
https://bibliotekanauki.pl/articles/1429344.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machining centre
model
aerospace
precision
Opis:
This article shows the aspects of precise modelling of precise High-speed Machining Centres for High-Speed Cutting (HSC) of parts used in the aerospace industry. The main focus was made on the thermal errors having a dominant influence on the precision of machining. Main assumptions for a hybrid thermal model of a centre thermal behaviour have been stated, taking into account the characteristics of heat sources. On the example of a 3-axis machining centre, measured runs of heating up and heat displacements have been shown, compared to these determined with the use of simulations of a behaviour in assumed working conditions. A special attention was drawn to the phenomena taking place in motorspindles, as well as to the displacements of a spindle face during high rotational speeds of spindles and step changes of rotational speeds. The significance and influence of the bearing preload and centrifugal forces on the spindle axial displacements was shown, which is decisive on the precision of part machining. Additionally, it was shown that the important component of a machining error is an error of spindle position identification by means of a linear encoder, resulting from the thermal deformation of a centre body, to which a quartz linear encoder is fixed.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 29-41
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of machining conditions on the forces in the process of roller brush machining
Autorzy:
Matuszak, J.
Powiązania:
https://bibliotekanauki.pl/articles/102899.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
brushing
machining conditions
radial force
cutting force
Opis:
Because of its advantages, brushing processing has many uses. The main ones include the removal of corrosion products, surface cleaning, deburring and shaping the properties of the surface layer. The intensity of these processes depends on the degree of impact of brush fibres on the work surface. In the case of tools, in which the resilient fibres are the working elements, forces in the brushing process, apart from the machining parameters, depend on the characteristics and overall dimensions of individual fibres. The paper presents the results of studies of the influence of technological parameters and type of fibres on the radial force in the brushing process.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 294-300
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical machining - special equipment and applications in aircraft industry
Autorzy:
Ruszaj, A.
Gawlik, J.
Skoczypiec, S.
Powiązania:
https://bibliotekanauki.pl/articles/407012.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrochemical machining
machining of special materials
turbine blades
aircraft engines
Opis:
Electrochemical machining is an unique method of shaping in which, for optimal parameters tool has no wear, surface layer properties after machining are similar to the core material and surface quality and accuracy increase together with material removal rate increase. Such advantages of electrochemical machining, besides of some ecological problems, create industry interest in the range of manufacturing elements made of materials with special properties (i.e. turbine blades of flow aircrafts engines). In the paper the nowadays possibilities and recent practical application of electrochemical machining in aircraft have been presented.
Źródło:
Management and Production Engineering Review; 2016, 7, 2; 34-41
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation into electrochemical discharge machining of microholes
Autorzy:
Kudla, L.
Powiązania:
https://bibliotekanauki.pl/articles/384333.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
electrochemical discharge machining (ECDM)
micromachining
microholes
Opis:
The paper presents fundamentals and technology of electrochemical discharge machining (ECDM) of microholes in borosilicate glass and partly in diamond crystals. The both mentioned materials have very useful technical properties but are difficult to machine using conventional or even laser techniques. The ECDM gives another chance to reduce some machining problems under condition of precise selection and control of the process means.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 21-24
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of magneto-abrasive machining of taps
Autorzy:
Maiboroda, Victor
Tarhan, Dmytro
Dzhulii, Dmytro
Slobodianiuk, Ivanna
Powiązania:
https://bibliotekanauki.pl/articles/387037.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
tap
magneto-abrasive machining
cutting tools
machining intensity
polishing effect
strengthening effect
Opis:
The features of magneto-abrasive machining of taps for metric thread cutting were investigated. The calculation method of integral intensity of the magneto-abrasive machining of the working surfaces of the taps by the quantitative values of normal and tangential components of moving speed of the quasi-stable volumes of the magneto-abrasive tool was developed. Based on the results of calculations, it was possible to predict the probable influence of the taps’ location in the working zone on the quality and efficiency of machining their working surfaces. The calculation method is relevant for taps of all diameters with a profile angle of 60°. The working surfaces of the tool would not be effectively machined if the location angle of taps to the plane of the working zone of the machine equals 20–60°. Depending on the expected major polishing or strengthening effect of magneto-abrasive machining, the taps are required to be located at an angle of 60–90° to the plane of the working zone of the machine.
Źródło:
Acta Mechanica et Automatica; 2020, 14, 1; 1-7
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Database of multi-variant machining process plan
Autorzy:
Gola, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/409500.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Database
multi-variant machining process plan
access
Opis:
This paper presents database of multi-variant machining process plan. This database is a part of CAPP (Computer Aided Process Planning) – prototype system, which was built on the basis of algorithm generating multi-variant process plan. Database was implemented to Microsoft Access 2010.
Źródło:
Research in Logistics & Production; 2014, 4, 3; 201-207
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing modular machining line design problem with mixed activation mode of machining units
Autorzy:
Belmokhtar, S.
Dolgui, A.
Delorme, X.
Ignatenko, I.
Powiązania:
https://bibliotekanauki.pl/articles/375904.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
modular machining line
cost optimization
mixed-integer programming
Opis:
A modular transfer line designing problem is investigated. The problem is to find the best subset of modules (machining units) from a given set and to assign them to different stations so that technological constraints and cycle upper limit are respected and the line cost is minimal. The investigated lines have a mixed activation mode for the machining units of each station, i. e. the units of each station are arranged into a series of stages such that each stage is composed of several units activated in parallel. A mixed integer program approach is proposed to model and solve the corresponding design problem. Improvements are suggested in order to reduce the model size and speed up the computations.
Źródło:
Decision Making in Manufacturing and Services; 2007, 1, 1-2; 35-48
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of machining errors by CMM-CNC data feedback
Autorzy:
Stryczek, R.
Powiązania:
https://bibliotekanauki.pl/articles/114048.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
machining error
error compensation
accuracy enhancement
Opis:
Needs and possibilities of the reduction of machining automation errors on the basis of the measurements of a workpiece which undergoes a multi-sided machining is presented in the paper. The article briefly shows various sources of machining errors and their reduction methods. The difficulties occurring when taking into account the CMM measurements results in the workshop environment are characterized. The examples of how the presented approach can be applied in practice is displayed.
Źródło:
Measurement Automation Monitoring; 2015, 61, 5; 154-157
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using thermovision for machining processes inspection
Autorzy:
Molenda, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/245868.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turning
infrared measurement
drilling
machining processes temperature
Opis:
During metal cutting process, an increase of the tool and workpiece temperatures can be observed. The heat generated has a negative influence on the tool life and performance. It causes rapid tool wear, plastic deformation of the cutting edge, built-up-edge formation and others. Therefore, the control of cutting temperature is required to achieve the desired tool performance. Temperature is the most frequently measured physical quantity, second only to time. Accurate temperature monitoring improves product quality and increases productivity. Downtimes are decreased, since the manufacturing processes can proceed without interruption and under optimal conditions. In this work, authors propose noncontact infrared method for determining temperature of machining processes. This was mainly due to thermography ability to catching moving targets in real time, to measure temperatures over some area not only in point. As a result of measurement, it is obtained a data set that is presented in a form of a colourful map: a thermogram. Getting an accurate temperature of an object using this method is difficult because of numerous errors, which researchers could done during experiments. This work presents some results of research done during turning and drilling realized on conventional lathe CDS 6250 BX-1000. These demonstrate the usefulness of proposed method to study the machining processes temperature.
Źródło:
Journal of KONES; 2016, 23, 3; 345-350
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Multidisciplinary Approach For Three-Dimensional Foil Machining
Autorzy:
Jaouen, R.
Martineau, J. P.
Hascoet, J.-Y.
Damay, T.
Powiązania:
https://bibliotekanauki.pl/articles/971241.pdf
Data publikacji:
2009
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
adapted tool trajectories
5 axis machining machining peaks
hydrofoil lspropellers
hydrodynamic
Opis:
The context of this paper implies disciplines of mechanical design, machining and hydrodynamics behaviours applied to propellers. Performances of propellers are linked with their shape and their surface texture. To optimise hydrodynamics behaviours, it is demonstrated in this paper that required polishing operation is not essential. To study the influence of an predefined surface texture on the performances of a three-dimensional foil, a comparative analysis is conducted. The presented methodology allows the definition of tool paths, according to the desired surface texture and upstream flow. Three foils are machined, and their performances are compared to each other: the first, considered as the reference, has a surface roughness like mirror, the second features machined peaks parallel to the upstream flow and the third has machined peaks following streamlines obtained by Computational Fluid Dynamics for operating conditions. The validation of this method is experimental: on the one hand by the manufacturing of foils following pre-established trajectories, and on the other hand by the functional test in hydrodynamic tunnel. This paper presents the methodology steps, and the hydrodynamic behaviours that the three different foils show. In a first approach, the different surface textures do not influence the lift coefficient but strongly influence the drag coefficient of a foil. Furthermore several hypotheses educed from the observed tendencies are discussed.
Źródło:
Journal of Machine Engineering; 2009, 9, 1; 5-17
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feed drive simulation for the prediction of the tool path follow up in High Speed Machining
Autorzy:
Prevost, D.
Lavernhe, S.
Lartigue, C.
Powiązania:
https://bibliotekanauki.pl/articles/1429192.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
simulation
high speed machining
5-axis machining
identification
Opis:
This paper deals with an advanced modeling of the feed drives of a five axis machine tool within the context of High Speed Machining. The management of the multi axes as well as high velocities causes problems to the set machine tool – Numerical Controller throughout the trajectory execution process. As a result, many errors are introduced during machining all process long affecting the surface quality. The paper aims at modeling the feed drive dynamics during trajectory follow-up including the current, the velocity and position loops as well as the feed forward terms, which characterize classical drives on actual HSM machines. It concerns translational axes as well as rotary axes. A procedure of identification of the virtual axis model are detailed for three and five axis trajectories presenting various types of geometrical discontinuities.
Źródło:
Journal of Machine Engineering; 2008, 8, 4; 32-42
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of Surface Roughness based on the Machining Conditions with the Effect of Machining Stability
Autorzy:
Lin, Yung-Chih
Chen, You-Chen
Wu, Kung-Da
Hung, Jui-Pin
Powiązania:
https://bibliotekanauki.pl/articles/102332.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
machining conditions
machining stability
regression analysis
surface roughness
warunki obróbki
stabilność obróbki
analiza regresji
chropowatość powierzchni
Opis:
This study was aimed at analyzing the influence of the cutting parameters (spindle speed, feed rate and cutting depth) on the surface roughness of the machined parts with the influence of the machining stability of the cutter. In order to consider the chattering effect, the machining stabilities were calculated based on the measured tool tip frequency response functions. A series of machining tests were conducted on aluminum workpieces under different cutting parameters. Then, the surface roughness prediction models in the form of nonlinear quadratic and power-law functions were established based on the multivariable regression method, in which the input parameters, cutting depth and spindle speed, were respectively defined in the stable and unstable regions, according to the stability lobes diagram. The current results show that both models built with the cutting parameters defined in stable regions demonstrate higher prediction accuracy of the surface roughness, about 90%, when compared with the models defined in full regions with the accuracy of about 80%. In particular, the power-law model is proven to have 90% prediction accuracy when validated with the cutting parameters in a stable region. As a conclusion, the mathematical models based on the cutting parameters with well-defined machining stability were proven to show more accurate prediction ability of the surface roughness. It could be expected that the prediction model can further be applied to optimize the machining conditions in low speed roughing and high speed finishing process with desirable surface quality.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 2; 171-183
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of elasto/visco-plastic workpiece material during machining
Autorzy:
Chodor, J.
Kukiełka, L.
Powiązania:
https://bibliotekanauki.pl/articles/99651.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machining
modeling
numerical simulations
chip
Opis:
Experimental investigations of plastic deformation and uniaxial tension of elasto/visco-plastic (E/V-P) material (41Cr4) were conducted to characterize the flow behavior of the material. Dynamic effects, constitutive damage law and contact with non-linear friction in simulations were described using updated Lagrangian formulation. That model of the process allows defining advanced simulations of tool's penetration in workpiece and chip formation. The yield stress is taken as a function of the strain and the strain rate in order to reflect realistic behavior of unsteady-state process, a material separation criterion based on the failure strain ?f were determined Finite element simulations were carried out using ANSYS code. The influence of the chosen process parameter in numerical simulations on the chip's shapes was presented. Results revealed good agreements between FEM results and experimental ones.
Źródło:
Journal of Machine Engineering; 2012, 12, 4; 99-116
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Corners Milling of Aluminum Alloy Elements
Autorzy:
Anasiewicz, K.
Włodarczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2065028.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
aluminum machining
surface roughness
machining strategy
Opis:
The article presents comparative research on the effects of milling of concave corners of elements made of aluminum alloy 7075. The work focuses on the study of the impact of changes in technological parameters and types of machining on the obtained geometrical state of the machined samples. Correct milling of the corners requires selection of the appropriate feed rate and the proper engagement angle of the milling cutter. At the corners, tool engagement angle increases, which significantly hinders the execution of stable machining and adversely affects the geometric and qualitative characteristics of the surface in the corners. Study with application of various strategies and technological parameters of milling corners with variable opening angles were carried out. The main parameters of surface roughness of the machined elements were examined. When analyzing the results obtained, conclusions were formulated indicating the relationship between the change of selected technological parameters, with the assumed type of treatment, and the obtained quality parameters of the samples made.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 33--39
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A finite element model for abrasive waterjet machining
Autorzy:
Hassan, A. I.
Kosmol, J.
Powiązania:
https://bibliotekanauki.pl/articles/279301.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
waterjet machining
finite element method
Opis:
This paper presents a first attempt to model abrasive waterjet (AWJM) machining process using the powerful tool of the finite element method (FEM) in order to explain the abrasive particle-workpiece interaction. The new model takes into account precise representation of the constitutive behaviour of the workpiece material under AWJ dynamic loading conditions which was ignored in previous AWJM models. In the present model, forces acting on the abrasive particle need not be initially determined, as in previous AWJM studies, as they are automatically calculated at each time step. The results show that the finite element method is a useful tool in predicting abrasive-material interaction and AWJ depth of cut.
Modelowanie obróbki strumieniem wodnościernym metodą elementów skończonych. W artykule przedstawiono pierwsze podejście do modelowania obróbki strumieniem wodnościernym metodą elementów skończonych. Celem badań jest próba wyjaśnienia zjawisk występujących na styku ścierniwa i przedmiotu obrabianego. Ten nowy model w sposób precyzyjniejszy uwzględnia właściwości materiału poddanego dynamicznym obciążeniom, co we wcześniejszych modelach nie było uwzględniane. W modelu tym nie trzeba definiować początkowej siły działającej na ścierniwo (jak to miało miejsce w poprzednich modelach), ponieważ jest ona automatycznie obliczana w każdym kroku czasowym. Wyniki symulacji pokazują, że MES jest bardzo dobrym narzędziem do przewidywania reakcji pomiędzy ścierniwem i przedmiotem obrabianym oraz głębokości skrawania.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 957-968
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frezotoczenie – hybrydowa obróbka skrawaniem
Rotating milling – hybrid machining
Autorzy:
Potrzebski, Marek
Styp-Rekowski, Michał
Świątek, Paweł
Świątek, Paweł Lech
Powiązania:
https://bibliotekanauki.pl/articles/1818871.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo AWART
Tematy:
frezowanie obrotowe
toczenie
frezowanie
wydajność obróbki
rotating milling
milling
turning
machining efficiency
machining accuracy
Opis:
W artykule w sposób syntetyczny przedstawiono frezotoczenie – niezbyt popularną ciągle metodę obróbki skrawaniem. Jest to obróbka hybrydowa stanowiąca połączenie tradycyjnych obróbek toczenia i frezowania. Przedstawiono jej zalety i wady. Przedstawiono także wyniki badań eksperymentalnych, które potwierdziły dużą przydatność frezotoczenia w praktyce przemysłowej. Jej pozytywną cechą jest wyraźnie większa efektywność obróbki w porównaniu do obróbek tradycyjnych, negatywną zaś – mniejsza dokładność. Ogranicza to w pewnym stopniu jej zastosowanie.
In this paper rotating milling – a not very popular method of machining is presented in a synthetic way. It is hybrid machining which combines traditional turning and milling operations. Its advantages and disadvantages are presented. The results of experimental research, which confirmed the great usefulness of rotating milling in industrial practice are also presented. Its positive feature is significantly better machining efficiency in comparison to traditional machining, while its negative feature is worse accuracy. This feature limits its use in some applications.
Źródło:
Obróbka Metalu; 2020, 1; 44--50
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of Electro-Discharge Mechanical Machining of Manganese Cast Steels
Autorzy:
Młynarczyk, P. S.
Spadło, S.
Powiązania:
https://bibliotekanauki.pl/articles/947639.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
EDM
flexible electrode
manganese cast steel
electro-discharge machining
roughness
machining efficiency
elektroda
staliwo manganowe
obróbka elektroerozyjna
chropowatość
Opis:
This paper presents a study of the hybrid electro-discharge mechanical machining BEDMM (Brush Electro-Discharge Mechanical Machining) with the application of a rotary disk brush as a working electrode. The discussed method enables not only an effective machining with a material removal rate of up to 300 mm3/min but also finishing (with the obtained roughness of Ra < 0.5 μm) of the surfaces of complex-shaped alloys with poor machinability. The analysis of the factors involved in the machining process indicates that its efficiency is determined by electrodischarge. The use of flexible working electrodes makes it possible to apply simple technological instrumentation and results in the simplicity of the process automation. The aim of the study was to obtain quantitative relationships between the parameters of brush electro discharge mechanical machining (BEDMM) and its effects. The presented experimental research results define the effect of the process input parameters on the performance and roughness of machined surfaces obtained for manganese cast steel.
Źródło:
Archives of Foundry Engineering; 2020, 20, 2; 95-100
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of new developments in machining of aerospace materials
Autorzy:
Jemielniak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1428707.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machining
aerospace materials
nickel alloy
titanium alloy
composite
Opis:
The paper presents an update of the recent literature on advances in machining of difficult to machine materials such as nickel and titanium-based alloys, and composites used in aeroengine and aerostructure applications. The review covers the following issues: advances in high-performance cooling techniques as cryogenic machining, minimum quantity lubrication, the combination of MQL and cryogenic cooling, and high-pressure lubricoolant supply and hybrid cutting processes – vibration assisted machining (both low and high frequency), laser, plasma and EDM assisted machining. Examples of applications in industrial processes are also given.
Źródło:
Journal of Machine Engineering; 2021, 21, 1; 22-55
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanofluid assistance in machining processes – properties, mechanisms and applications: a review
Autorzy:
Grzesik, Wit
Powiązania:
https://bibliotekanauki.pl/articles/1429063.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
nanofluid
nanoparticle
machining process
minimum quantity lubrication
Opis:
A special group of hybrid assisted processes termed media-assisted processes which apply liquid media with special additives in the form of nanoparticles supplied to the cutting zone is overviewed. Special attention is paid to minimum quantity lubrication (MQL) technique with the use of nanofluids. In this review paper some important thermal and tribological effects resulting from the applications of various nanoparticles are outlined and compared. The MQL-nano cutting fluid mechanisms (rolling and ploughing) are described. In particular, some important quantitative effects concerning thermal and tribological behaviour of the cutting process as well as surface quality are presented.
Źródło:
Journal of Machine Engineering; 2021, 21, 2; 75-90
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność obróbki elementów wielkogabarytowych – zagadnienia technologiczne
Large-size elemets machining accuracy – technological problems
Autorzy:
Styp-Rekowski, M.
Matuszewski, M.
Oborski, I. L.
Bromberek, F.
Powiązania:
https://bibliotekanauki.pl/articles/404449.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo AWART
Tematy:
obróka elementów wielkogabarytowych
dokładność
machining
machining accuracy
large-size element
Opis:
W artykule przedstawiono czynniki technologiczne determinujące dokładność obróbki elementów, zwłaszcza wielkogabarytowych. Przedstawiono także sposoby aby zminimalizować negatywny wpływ tych czynników na dokładność wymiarową elementów.
In the paper there were presented technological factors which determine element's machining accuracy, particularly large-size elements. The ways which enable minimization their negative influence on dimensional accuracy were presented too.
Źródło:
Obróbka Metalu; 2015, 3; 11-14
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary evaluation of the applicability of F, V and AEsignals in diagnosis of ADI machining process
Autorzy:
Myszka, D.
Bombiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/381921.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austempered ductile iron
machining
diagnosis
ADI machining process
żeliwo sferoidalne
obróbka
diagnostyka
obróbka ADI
Opis:
In this study, a preliminary evaluation was made of the applicability of the signals of the cutting forces, vibration and acoustic emission in diagnosis of the hardness and microstructure of ausferritic ductile iron and tool edge wear rate during its machining. Tests were performed on pearlitic-ferritic ductile iron and on three types of ausferritic ductile iron obtained by austempering at 400, 370 and 320°C for 180 minutes. Signals of the cutting forces (F), vibration (V) and acoustic emission (AE) were registered while milling each type of the cast iron with a milling cutter at different degrees of wear. Based on individual signals from all the sensors, numerous measures were determined such as e.g. the average or maximum signal value. It was found that different measures from all the sensors tested depended on the microstructure and hardness of the examined material, and on the tool condition. Knowing hardness of the material and the cutting tool edge condition, it is possible to determine the structure of the material .Simultaneous diagnosis of microstructure, hardness, and the tool condition is probably feasible, but it would require the application of a diagnostic strategy based on the integration of numerous measures, e.g. using neural networks.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1; 91-96
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrode tool designing in the ECM machining for curvilinear surfaces
Autorzy:
Paczkowski, T.
Zdrojewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/99678.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
computer simulation
electrochemical machining
electrolyte flow
Opis:
Electrochemical machining with the use of a tool electrode (ECM.S) is one of the basic and most widely used electrochemical technological operations for machining tools and machine parts. This article presents a method of approximating the surfaces with electrode designing curves, with an assumed two dimensional electrolyte flow model in the inter-electrolyte gap. An example of calculations is also presented.
Źródło:
Journal of Machine Engineering; 2010, 10, 1; 58-69
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some aspects of electrochemical machining process modeling and applications
Wybrane zagadnienia modelowania i praktycznego zastosowania procesu obróbki elektrochemicznej
Autorzy:
Ruszaj, A.
Powiązania:
https://bibliotekanauki.pl/articles/176245.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrochemical machining
mathematical modeling
electrochemical machining applications
obróbka elektrochemiczna
modelowanie matematyczne
zastosowanie obróbki elektrochemicznej
Opis:
Electrochemical machining process (ECM) can be applied for shaping advanced materials which are difficult or impossible for machining using conventional methods. In electrochemical machining the workpiece is an anode and material is removed as a result of electrochemical reactions “atom” by “atom”, without mechanical forces. This mechanism of material removal makes it possible to obtain high quality of machined surface layer with uniform properties. Very important advantage of ECM process is also the fact that there is no electrode – tool wear because the equivalent reaction to anodic dissolution is hydrogen generation on cathode surface and hydrogen can be easy removed from interelectrode gap by electrolyte flow. Because of this advantages ECM process is dynamically developed. Some aspects of ECM process mathematical modeling and practical applications are presented in the paper, taking into account literature review and author’s own research.
Procesy obróbki elektrochemicznej (ECM) są stosowane do kształtowania wyrobów wykonanych z materiałów specjalnych przewodzących prąd elektryczny, trudnych lub niemożliwych do obróbki metodami konwencjonalnymi. W obróbce elektrochemicznej przedmiot obrabiany jest anodą i materiał jest usuwany w wyniku reakcji elektrochemicznych bez oddziaływania sił mechanicznych. Proces taki usuwania materiału umożliwia uzyskanie wysokiej jakości warstwy wierzchniej obrabianych wyrobów. Zaletą procesu ECM jest brak zużycia elektrody roboczej (narzędzia). Reakcją ekwiwalentną do reakcji anodowego roztwarzania jest bowiem wydzielanie się wodoru, łatwo usuwanego przez przepływający elektrolit. Stąd obecnie procesy ECM są dynamicznie rozwijane. W pracy przedstawiono niektóre problemy związane z matematycznym modelowaniem oraz aplikacją procesów ECM, z uwzględnieniem danych literaturowych i wyników badań własnych.
Źródło:
Advances in Manufacturing Science and Technology; 2017, 41, 4; 5-22
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic parameter identification in nonlinear machining systems
Autorzy:
Nicolescu, M.
Archenti, A.
Powiązania:
https://bibliotekanauki.pl/articles/100167.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machining system
dynamic parameters
white noise excitation
self-excited vibration
Opis:
The demand for enhanced performance of production systems in terms of quality, cost and reliability is ever increasing while, at the same time, there is a demand for shorter design cycles, longer operating life, minimisation of inspection and maintenance needs. Experimental testing and system identification in operational conditions still represent an important technique for monitoring, control and optimization. The term identification refers in the present paper to the extraction of information from experimental data and is used to estimate operational dynamic parameters for machining systems. Such an approach opens up the possibility of monitoring the dynamics of machining systems during operational conditions, and can also be used for control and/or predictive purposes The machining system is considered nonlinear and excited by random loads. Parametric and nonparametric techniques are developed for the identification of the nonlinear machining system and their application is demonstrated both by numerical simulations and in actual machining operations. Discrimination between forced and self-excited vibrations is also presented. The ability of the developed methods to estimate operational dynamic parameters ODPs is presented in practical machining operations.
Źródło:
Journal of Machine Engineering; 2013, 13, 3; 91-116
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the surface topography after precision machining
Autorzy:
Tomkowski, R.
Kacalak, W.
Lipiński, D.
Powiązania:
https://bibliotekanauki.pl/articles/99460.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
extra smooth surfaces
geometric features
surface parameters
machining
Opis:
Analysis of the geometric features and determination of the condition of the surfaces machined during an abrasive process is of crucial importance for evaluation of their wear properties. Numerous parameters can be used for assessing topography of technical surfaces. Many of them contain information that is general or poorly correlated with the wear features. The group of parameters used for such purpose should include those that do not cause information redundancy and provide distinct information. Evaluation of the surface geometric structure after precision machining is a difficult process due to the limited scope of unevenness heights that fit within the range of a few micrometers to a few nanometers. In this paper the synthetic indexes of the evaluation of extra smooth surfaces were created, taking into consideration numerous elementary parameters. The value of the synthetic index was determined as the geometric average of the partial indexes which, when compared to the arithmetic average, is more dependent on the data believed to be disadvantageous.
Źródło:
Journal of Machine Engineering; 2012, 12, 4; 71-80
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of crankshaft machining
Monitorowanie obróbki wałów korbowych
Autorzy:
Fries, J.
Dubina, S.
Powiązania:
https://bibliotekanauki.pl/articles/410143.pdf
Data publikacji:
2011
Wydawca:
STE GROUP
Tematy:
obróbka skrawaniem
wał korbowy
czas operacyjny
machining
crankshaft
operations time
Opis:
Within the MPO project which focuses on supporting lunettes control and crankshaft alignment automation it was necessary to measure time demands of some activities during machining of selected crankshaft types. The article evaluates the basic data measured.
W ramach projektu MPO, który koncentruje się na wspieraniu sterowania lunetą oraz automatyzacji ustawienia obrabianego wału korbowego, koniecznym było dokonanie pomiarów czasów operacyjnych podczas wytwarzania wybranych typów wałów. W artykule dokonano oceny zebranych podstawowych danych.
Źródło:
Management Systems in Production Engineering; 2011, 4 (4); 23-28
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaktywne hybrydowe systemy monitorowania i optymalizacji procesów mikro- i nanoobróbki
Interactive hybrid systems for monitoring and optimization of micro- and nano-machining processes
Autorzy:
Lipiński, D.
Majewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/155273.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
monitorowanie procesów mikroobróbki
monitorowanie procesów nanoobróbki
optymalizacja procesów mikroobróbki
optymalizacja procesów nanoobróbki
system inteligentny
interakcja
sztuczna inteligencja
monitoring of micro-machining processes
monitoring of nano-machining processes
optimization of micro-machining processes
optimization of nano-machining processes
intelligent system
interaction
artificial intelligence
Opis:
Artykuł prezentuje opracowaną koncepcję interaktywnych hybrydowych systemów monitorowania i optymalizacji procesów mikro- i nanoobróbki. Inteligentny system zdalnego monitorowania i optymalizacji jakości procesów, wyposażony w interfejs wizualny i głosowy, przedstawiono w przykładowym zastosowaniu w procesach precyzyjnego szlifowania. Opracowana koncepcja proponuje architekturę systemu wyposażoną w warstwę analizy danych, warstwę nadzorowania procesu, warstwę decyzyjną, podsystem komunikacji głosowej w języku naturalnym oraz podsystem komunikacji wizualnej z opisem głosowym.
The paper presents a concept of interactive hybrid systems for monitoring and optimization of micro- and nano-machining processes. The intelligent system for monitoring and optimization of the process quality, equipped with a visual and speech interface, is presented in an exemplary application to precision grinding processes. The developed concept proposes an architecture of the system equipped with a data analysis layer, a process supervision layer, a decision layer, a communication subsystem by speech and natural language, and a visual communication subsystem using vocal descriptions. In the proposed system, computational intelligence methods allow for real-time data analysis of the monitored process, configuration of the system, process supervision based on process features and quality models. The system is also capable of detection of inaccuracies, estimation of inaccuracies results, compensation of inaccuracies results, and selection of machining parameters and conditions. The paper describes the concept of voice and visual communication (Fig. 1), and the complete structure of the system (Fig. 2). The interactive system using mobile technologies is shown in Fig. 3, while the system using neural models is presented in Fig. 4. Also the block diagrams of command meaning analysis methods (Figs. 5 and 6), and the probabilistic neural networks for process assessment (Figs. 7 and 8) are shown in the paper.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 10, 10; 920-923
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid additive and subtractive manufacturing processes and systems: a review
Autorzy:
Grzesik, W.
Powiązania:
https://bibliotekanauki.pl/articles/99525.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hybrid manufacturing
CNC machining
additive machining
laser cladding
repair technology
Opis:
This review paper highlights the hybrid manufacturing processes which integrate the additive and subtractive processes performing on one hybrid platform consisting of the LMD (laser metal deposition) unit and CNC machine tools. In particular, some important rules and advantages as well as technological potentials of the integration of different AM technique and finishing CNC machining operations are discussed and overviewed. Some representative examples such as formation of difficult features around the part periphery, deposition of functional layers and coatings and repair of high-value parts in aerospace industry are provided. Some conclusions and future trends in the implementation of hybrid processes are outlined.
Źródło:
Journal of Machine Engineering; 2018, 18, 4; 5-24
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active alignment chuck for ultra-precision machining
Autorzy:
Daghini, L.
Archenti, A.
Rashid, A.
Nicolescu, C. M.
Powiązania:
https://bibliotekanauki.pl/articles/99849.pdf
Data publikacji:
2011
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
ultraprecision machining
high damping interface
active alignment
Opis:
Ultraprecision (UP) components have become common in everyday life products such as mobile phones or compact high resolution digital cameras. Thus the need of producing such components with high accuracy and low production cost. UP machine tools are capable of extremely high accuracy in tool positioning but still today the workpiece is positioned by hand, hence the high production cost of UP components. A fully automated chain of production has been developed within the EU-IP project "Production 4 micro". This paper describes the active alignment chuck for workholding in UP machining. The chuck has been provided with a high damping interface (HDI) and to evaluate its efficiency the chuck has undergone an experimenta modal analysis (EMA) as well as machining tests. The chosen operation was grooving by fly cutting using a diamond tool. The EMA showed that the HDI was effective for those modes where there was relative displacement between one side and the other of the HDI. This result was confirmed by the machining tests as well. The HDI resulted being effective in damping high frequency modes (around 4 - 5 kHz), hence one expected benefit would be a longer tool life.
Źródło:
Journal of Machine Engineering; 2011, 11, 4; 39-48
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process factors of impact on OEE for lathes for machining of wheelset
Autorzy:
Stryczek, R.
Szczepka, W.
Powiązania:
https://bibliotekanauki.pl/articles/100007.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
wheelset machining
optimization
friction drive
adaptive control
Opis:
Lathes for machining of wheelsets are the specific class of production means, for which the maintaining of satisfactorily high value of coefficient of overall equipment effectiveness (OEE) is very difficult and depends on many different factors. In this study it has been focused on the process factors which influence shaping of OEE for this group of lathes. These include: optimizing the geometry of the wheel flange, identifying and optimization of partition of machining allowance, segmentation and parameterization of machining programs, adaptive control of roughing as well as detecting and reducing of occurrence of slippage between the drive rollers and the machined wheel. A particularly difficult problem is to detect and avoid slippage of drive rollers at the moment of stopping of the machined wheelset, as a result of occurrence of excessive cutting resistances. In the study it has been presented a new method for detecting of slippage and reacting through synchronous actions, to the occurrence of slippage in the friction drive lathes. The method described in this work has been implemented in real industrial conditions.
Źródło:
Journal of Machine Engineering; 2016, 16, 3; 126-140
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model homogeniczny impulsowej obróbki elektrochemicznej
Homogeneous model of pulse electrochemical machining
Autorzy:
Rozenek, M.
Powiązania:
https://bibliotekanauki.pl/articles/270027.pdf
Data publikacji:
2011
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
obróbka elektrochemiczna impulsowa
modelowanie
symulacja
pulse electrochemical machining
modelling
simulation
Opis:
Tradycyjny proces przygotowania procesu technologicznego, wykonanie elektrod-narzędzi, dobór parametrów obróbki, jest długotrwały i kosztowny. Jedną z najskuteczniejszych metod redukcji kosztów jest modelowanie i symulacja komputerowa procesu. W artykule przedstawiono założenia oraz opis matematyczny modelu homogenicznego obróbki elektrochemicznej impulsowej wraz z wynikami symulacji komputerowej. W szczególności zaprezentowano wyniki dotyczące wpływu parametrów procesu na przebiegi: gęstości prądu w impulsie, temperatury i zmiany koncentracji fazy gazowej.
The traditional preparation process is long and expensive (implementation of electrode tools, selection of processing parameters). One of the most effective methods of reducing costs is the modeling and computer simulation of the process. The article presents the assumptions and the mathematical description of the homogeneous model pulse electrochemical machining with the results of computer simulation. In particular, the presented results concerning the influence of process parameters on the waveforms in the pulse current density, temperature, changes in concentration of the gas phase
Źródło:
Inżynieria Maszyn; 2011, R. 16, z. 4; 101-108
1426-708X
Pojawia się w:
Inżynieria Maszyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the Work of Multi-spindle Machining Centers with the Petri Nets
Autorzy:
Stryczek, Roman
Powiązania:
https://bibliotekanauki.pl/articles/24200521.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
stochastic petri nets
machining center
process modeling
process simulation
Opis:
The article presents the results of the simulation studies concerning the impact of random production interruptions on the efficiency of multi-spindle machining centers. Four different machining center configuration models were developed using a dedicated class of stochastic Petri nets. In addition to the number of machine spindles, the number of simultaneously mounted parts, loading time of parts, their machining time, and reliability parameters regarding the frequency of machine interruptions caused by random factors were also taken into account as model parameters. A series of virtual tests was carried out for machining processes over a period of 1000 hours of operation. Analysis of the results confirmed the purpose of conducting simulation tests prior to making a decision regarding the purchase of a multispindle milling center. This work fills the existing research gap, as there are no examples in the technical literature of evaluating the effectiveness of multi-spindle machining centers.
Źródło:
Management and Production Engineering Review; 2023, 14, 3; 16--26
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Areal field and fractal based characterization of hard surfaces produced by different machining operations
Autorzy:
Zak, K.
Powiązania:
https://bibliotekanauki.pl/articles/99745.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hard machining
grinding
ball burnishing
surface texture
fractals
Opis:
This literature survey highlights the possible influences of surface roughness parameters on functional properties of surfaces produced by different finishing operations. The prediction of such functional properties as fatigue, sealing capacity, adhesion, friction, wear and corrosion resistance based on five groups of spatial (S) roughness parameters is overviewed. In contrast, traditional approach based on 2D roughness parameters is provided. Some real 3D surface topographies produced with desired functional properties by finishing cutting and abrasive operations are characterized. This survey confirms the vital role of machined surfaces in the functionality of machine components.
Źródło:
Journal of Machine Engineering; 2016, 16, 1; 24-32
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and simulation of nonlinear self-excited vibrations in turning
Autorzy:
Zeleny, J.
Repak, T.
Fojtu, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429152.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
machining
machining process
self-excited vibrations
Opis:
Commonly applied theories of self-excited vibrations in machine tools are prevailingly based on frequency domain analysis of linear models and are devoted in most cases only to evaluation of stability limits of strictly linear systems. In this way, the behaviour of more stable or more unstable systems cannot be studied and analyzed. Certain important nonlinear effects cannot be studied as well for limitations connected with classical representation of systems only in the frequency domain. Evaluation of stability by analysis of nonlinear systems in time domain has not been applied until now. The paper shows a new approach based on interpretation of the self-excited vibration systems as nonlinear servo-systems. With this approach, linear and nonlinear systems of any degree of stability can be studied by combination of frequency and time-domain methods. This can considerably contribute to better understanding of complex phenomena in various regimes and special situations.
Źródło:
Journal of Machine Engineering; 2008, 8, 4; 68-79
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of carbon fibres as tool electrodes in micro electrical discharge machining
Autorzy:
Kudla, L.
Trych, A.
Powiązania:
https://bibliotekanauki.pl/articles/385286.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
electrical discharge machining (EDM)
micromachining
carbon fibres electrodes
Opis:
The aim of this paper is to present the outcomes of the experiments concerning micro electrical discharge machining with the use of carbon fibres as tool electrodes. Key properties of carbon fibres are discussed and the procedure of such electrodes fabrication is also described. Conducted tests indicate promising perspectives for machining with such electrodes by means of shaping microcavities, but at the same time they reveal problems. A longitudinal machining as well as experiments with different electric parameters were presented. Finally, the influence of discharge energy is being considered.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 153-156
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obróbka elementów wielkogabarytowych. Zagadnienia pomiarowe
Machining of large-size elements. Measurement problems
Autorzy:
Horyashchenko, S.
Matuszewski, M.
Oborski, I. L.
Styp-Rekowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/404459.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo AWART
Tematy:
large-size element
machining
machining accuracy
thermal forcing
obróbka skrawaniem
korpus obrabiarki
pomiar odchyłek kształtu
dokładność obróbki
Opis:
The paper presents the problems concerning the machining of large-size elements. Metrological problems, which have a significant influence on the accuracy of such elements, have been indicated. Proposals how to minimize the effects of thermal forcing interacting during machining were also presented. A results of experimental investigations verifying the proposals were presented too.
W artykule przedstawiono problemy dotyczące obróbki skrawaniem elementów o dużych gabarytach. Wskazano zagadnienia metrologiczne, które mają istotny wpływ na dokładność wykonania takich elementów. pisano propozycje jak zminimalizować skutki czynników cieplnych oddziałujących podczas obróbki oraz rezultaty badań je weryfikujących.
Źródło:
Obróbka Metalu; 2018, 2; 38-41
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chip grain size from the process of machining steamed and unsteamed alder wood on a cnc machining center and assessment of separation results
Autorzy:
Dzurenda, Ladislav
Banski, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/24072429.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
alder wood
steaming
CNC machining center
granulometric composition of chips
filter technique
Opis:
The paper discusses the particle size of the chips formed in the process of machining unsteamed and steamed alder wood on a CNC machining center. From the granulometric analysis of the chips, it follows that the average share of the coarse fraction of the chips created from unsteamed alder wood is 66.0% and steamed alder wood is 62.9%. The representation of medium-coarse fractions of alder wood with dimensions of 1.0-0.125 μm in unsteamed wood is 29.5% and steamed by 32.7%. Dust fractions with dimensions below 125 μm in unsteamed alder wood account for 4.5% and in steamed alder wood 4.4%. Chips of non-steamed or steamed alder wood with dimensions below 32 μm were not measured, so it can be concluded that no respirable dust particles with dimensions below < 10 μm are formed. Changes in the physical and mechanical properties of steamed alder wood are manifested by a decrease in the coarse fraction above 2 mm and an increase in the fraction of chips 0.125 to 2000 μm. For the separation of chips, both unsteamed and steamed alder wood, from the transport air, fabric filters and filter fabric Finet PES 4 are suitable, the separation limit of which is smaller than the size of the smallest chips formed in the milling process: aMO = 7 µm amin = 32 µm.
Rozmiar wiórów z procesu obróbki drewna olchowego parowanego i nieparowanego na centrum obróbkowym cnc oraz ocena warunków rozdzielania. W pracy omówiono ziarnistość wiórów powstających w procesie obróbki drewna olchowego nieparzonego i parzonego na centrum obróbczym CNC. Z analizy granulometrycznej zrębki wynika, że średni udział frakcji grubej zrębki powstałej z nieparzonego drewna olchowego wynosi 66,0%, a parzonego drewna olchowego 62,9%. Udział frakcji średniogrubych drewna olchowego o wymiarach 1,0-0,125 μm w drewnie nieparzonym wynosi 29,5%, a parzonym 32,7%. Frakcje pyłu o wymiarach poniżej 125 μm w drewnie olchy nie parzonej stanowią 4,5%, aw drewnie olchy parzonej 4,4%. Nie mierzono wiórów drewna olchowego nie parzonego lub parzonego o wymiarach poniżej 32 μm, można więc stwierdzić, że nie tworzą się pyły respirabilne o wymiarach poniżej 10 μm. Zmiany właściwości fizycznych i mechanicznych parzonego drewna olchowego przejawiają się spadkiem frakcji grubej powyżej 2 mm i wzrostem frakcji wiórów od 0,125 do 2000 μm. Do separacji zrębków zarówno nieparzonego jak i parzonego drewna olchowego z powietrza transportowego nadają się filtry tkaninowe i włóknina filtracyjna Finet PES 4, których granica oddzielania jest mniejsza od wielkości najmniejszych wiórów powstałych w procesie frezowania: aMO = 7 μm amina = 32 μm.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 43--50
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modelling of the laser machining process of sapphire crystal Al2O3
Autorzy:
Wyszyński, D.
Skoczypiec, S.
Furyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/99499.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
laser beam machining
micromachining
sapphire
Opis:
The paper presents theoretical aspects concerning use of pulse laser source for precise machining of Al2O3 crystals for medical applications. The scheme of laser beam manipulation and the test stand has been presented. Application of the mathematical model enabled determination of values of basic sapphire machining parameters. Presented results give rough information about dynamics of the process and can be used for the test stand designing as well as determination of machining precision.
Źródło:
Journal of Machine Engineering; 2012, 12, 2; 20-28
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of Optimal Machining Strategy in the Manufacture of Elements Bounded by Curvilinear Surfaces
Autorzy:
Czerech, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/386869.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
maszyny
CAD
CAM
toolpath tolerance
machining strategy
geometric deviations
Opis:
Increasing machining accuracy realized on CNC machine tools causes that the more frequently surfaces machined with this technique are not subject to further finishing processing and directly affects on the final quality of the product. Achieving geometric accuracy established by the constructor is the problem that modern technologists and CAD/CAM programmers have to faced with. The paper presents the influence of toolpath tolerance and machining strategy available in CAD/CAM software on the constituting process of technological surface layer for elements limited with curvilinear surfaces. The impact of the above mentioned parameters on the location and direction of geometrical deviations were also analyzed. Following article is part of research of the impact of selected technological parameters on the freeform surfaces geometric structure manufactured on CNC machines
Źródło:
Acta Mechanica et Automatica; 2013, 7, 1; 5-10
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie autonomicznych głowic obróbkowych w procesach wygładzania materiałów trudnoskrawalnych w przemyśle samochodowym
Application of autonomous machining heads in smoothing processes of hard-wearing materials in the automotive and aerospace industries
Autorzy:
Gotowała, K.
Musiał, W.
Powiązania:
https://bibliotekanauki.pl/articles/315848.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
obróbka
wygładzanie
głowica obróbkowa
machining
smoothing
machining head
Opis:
W artykule przedstawiono innowacyjny sposób obróbki materiałów trudnoskrawalnych, który może być wdrożony w przemyśle samochodowym i lotniczym. Przedstawiono obróbkę wygładzającą powierzchni krzywoliniowych. Zaprezentowana metoda obróbki może być wykorzystana do wygładzania powierzchni i krawędzi odlewów powstałych na skutek realizacji procesu produkcyjnego części samochodowych i lotniczych. Metoda obróbki powierzchni i krawędzi, może być wykorzystana również po cięciu laserowym i innych obróbkach erozyjnych.
The article presents the method of processing hard-wearing materials used in the automotive and aviation industry. The smoothing treatment of curvilinear surfaces is shown. The presented machining method can be used to smooth the surfaces and edges of castings resulting from the production process of automotive parts. The surface and edge treatment method can also be used after laser cutting.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 7-8; 328-330
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie obróbki wodno-ściernej do szybkiego wytwarzania prototypów
Abrasive waterjet machining application for rapid prototyping
Autorzy:
Wala, T.
Powiązania:
https://bibliotekanauki.pl/articles/270074.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
obróbka wodno-ścierna
cięcie 5-osiowe
waterjet machining
Opis:
Szybkie wytwarzanie prototypów przez zastosowanie wysokociśnieniowej technologii cięcia strumieniem wodno-ściernym warunkowane jest możliwością manipulowania położeniem głowicy tnącej w stosunku do przedmiotu. Dodatkowe możliwości można uzyskać przez manipulowanie pozycją przedmiotu obrabianego w trakcie procesu. Obecnie na rynku przemysłowym technologie przeznaczone do szybkiego wytwarzania prototypu pozwalają na kształtowanie modelu określonego urządzenia, jednocześnie uwzględniając kinematykę ruchową. Dlatego też należy zaznaczyć, że prototypowanie przez zastosowanie metody wodno-ściernej dotyczy tylko i wyłącznie jednej części danego zespołu. Artykuł przedstawia metody i ograniczenia podczas manipulowania położeniami głowicy tnącej i przedmiotem obrabianym w metodzie obróbki wodno-ściernej, z wykorzystaniem 5-osiowego sterowania dla nadania przedmiotowi (prototypowi) określonego kształtu.
The rapid prototyping with the application of high pressure abrasive waterjet cutting technology is determinated by the possibilities of the cut head manipulation. The article shows the restrains of the cut head manipulation. The increase possibility can achieve by the workpiece manipulation during the process. Al presents on the industry market exists technologies, where prototype performance is associated with production once the whole assemble with moving parts. Therefore it should be marked that prototyping by using the abrasive waterjet method can be used only for single part of the assemble. The article shows modem relative manipulation method once by cut head and workpiece by using the abrasive waterjet machining for final shape of workpiece (prototype) performance.
Źródło:
Inżynieria Maszyn; 2012, R. 17, z. 3; 84-93
1426-708X
Pojawia się w:
Inżynieria Maszyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostics of workpiece surface condition based on cutting tool vibrations during machining
Autorzy:
Józwik, J.
Mika, D.
Powiązania:
https://bibliotekanauki.pl/articles/102959.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vibration
diagnostics
machining
turning
surface geometric structure
roughness parameters
Opis:
The paper presents functional relationships between surface geometry parameters, feedrate and vibrations level in the radial direction of the workpiece. Time characteristics of the acceleration of cutting tool vibration registered during C45 steel and stainless steel machining for separate axes (X, Y, Z) were presented as a function of feedrate f. During the tests surface geometric accuracy assessment was performed and 3D surface roughness parameters were determined. The Sz parameter was selected for the analysis, which was then collated with RMS vibration acceleration and feedrate f. The Sz parameter indirectly provides information on peak to valley height and is characterised by high generalising potential i.e. it is highly correlated to other surface and volume parameters of surface roughness. Test results presented in this paper may constitute a valuable source of information considering the influence of vibrations on geometric accuracy of elements for engineers designing technological processes.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 26; 57-65
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on oxidation phenomenon during titanium machining and its prevention
Autorzy:
Tanabe, Ikuo
Goi, Yuya
Tanabe, Yuko
Powiązania:
https://bibliotekanauki.pl/articles/99617.pdf
Data publikacji:
2020
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
titanium
titanium alloy
countermeasure
oxidation
L-ascorbic acid
machining
Opis:
Over the last few decades, titanium alloys have become an important ingredient in many industrial sectors. In fact, titanium with additional characteristics, such as: high strength, heat resistance, low thermal conductivity, light weight and biocompatibility are being more and more used. However, the machining of titanium products tends to result in a thermal oxidation process and the development of a coloured layer. Therefore, a research regarding the thermal oxidation phenomena and its prevention was conducted. In this regard, cutting and grinding processes were experimentally investigated. Subsequently, L-ascorbic acid, a substance used against food oxidation, was used as an agent against oxidation during grinding. The main conclusions of the current study are the following: (1) Causes leading to the thermal oxidation during cutting and grinding were defined, (2) Prevention against oxidation was established by using L-ascorbic acid and strong alkaline water solution, (3) Optimum density of the solution with L-ascorbic acid and strong alkaline water was only 7.5 wt. % for grinding.
Źródło:
Journal of Machine Engineering; 2020, 20, 2; 77-85
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autonomous machining – recent advances in process planning and control
Autorzy:
Dittrich, Marc-André
Denkena, Berend
Boujnah, Haythem
Uhlich, Florian
Powiązania:
https://bibliotekanauki.pl/articles/99503.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
process planning
adaptive machining
machine learning
Opis:
While autonomous driving has come close to reality over the recent years, machining is still characterised by many manual tasks and prone to costly errors. In this article, an overview is given about the potential of autonomous machining and uprising technologies that support this vision. For that purpose, a definition of autonomous machine tools and the required elements is presented. Next, selected elements of an autonomous machine tool, e.g. sensory machine components and control loops, are discussed. Finally, some insights into ongoing research projects regarding the use of machine learning for process planning and control are given.
Źródło:
Journal of Machine Engineering; 2019, 19, 1; 28-37
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy modeling and parametric analysis of non-traditional machining processes
Autorzy:
Chakraborty, Shankar
Das, Partha Protim
Powiązania:
https://bibliotekanauki.pl/articles/406928.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-traditional machining process
fuzzy model
process parameter
response
interaction plot
Opis:
The application of artificial intelligence (AI) in modeling of various machining processes has been the topic of immense interest among the researchers since several years. In this direction, the principle of fuzzy logic, a paradigm of AI technique, is effectively being utilized to predict various performance measures (responses) and control the parametric settings of those machining processes. This paper presents the application of fuzzy logic to model two non-traditional machining (NTM) processes, i.e. electrical discharge machining (EDM) and electrochemical machining (ECM) processes, while identifying the relationships present between the process parameters and the measured responses. Moreover, the interaction plots which are developed based on the past experimental observations depict the effects of changing values of different process parameters on the measured responses. The predicted response values derived from the developed models are observed to be in close agreement with those as investigated during the past experimental runs. The interaction plots also play significant roles in identifying the optimal parametric combinations so as to achieve the desired responses for the considered NTM processes.
Źródło:
Management and Production Engineering Review; 2019, 10, 3; 111-123
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of machining centre sliding system fault detection using torque signals and autoencoder
Autorzy:
Augustyn, Damian
Fidali, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2233649.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
condition monitoring
torque signal
machining centre
anomaly detection
autoencoder
Opis:
The sliding system of machining centres often causes maintenance and process problems. Improper operation of the sliding system can result from wear of mechanical parts and drives faults. To detect the faulty operation of the sliding system, measurements of the torque of its servomotors can be used. Servomotor controllers can measure motor current, which can be used to calculate motor torque. For research purposes, the authors used a set of torque signals from the machining centre servomotors that were acquired over a long period. The signals were collected during a diagnostic test programmed in the machining centre controller and performed once per day. In this article, a method for detecting anomalies in torque signals was presented for the condition assessment of the machining centre sliding systems. During the research, an autoencoder was used to detect the anomaly, and the condition was assessed based on the value of the reconstruction error. The results indicate that the anomaly detection method using an autoencoder is an effective solution for detecting damage to the sliding system and can be easily used in a condition monitoring system.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 3; 445--451
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Hamming network to the classification of surfaces after abrasive machining
Autorzy:
Lipinski, D.
Tomkowski, R.
Kacalak, W.
Powiązania:
https://bibliotekanauki.pl/articles/99929.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
classification
surface topography
abrasive machining
neural network
Opis:
The use of artificial neural networks for modelling and inference about surface parameters is a more and more often undertaken research topic. Based on the analysis of the ranges of suitability of surface topography parameters, a variety of different parameters can be observed to identify surfaces with different features and different conditions of use. The issues of surface topography analysis and determination of surface condition after abrasive machining are of fundamental importance. Currently, when assessing the surface intended for interaction with the other surface, it is possible to use many surface evaluation parameters. Assigning the machined surface to the appropriate assessment group, especially in automated quality control systems, requires a preliminary surface classification. In this article Hamming's network was used for the surface classification along with modification of Hamming distance.
Źródło:
Journal of Machine Engineering; 2018, 18, 4; 114-126
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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