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Wyświetlanie 1-15 z 16
Tytuł:
Acceptability testing and development of a novel wood lathe balanced rest
Autorzy:
Onrejas, Ernyl S.
Etcuban, Jonathan O.
Arcadio, Redjie D.
Ponce, Marde T.
Ancheta, Rosein
Demeterio, Rino Anthony
Powiązania:
https://bibliotekanauki.pl/articles/94168.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
wood lathe
design
ergonomics
Opis:
The utility model discussed in this study discloses a wood lathe balancing rest that is advantageous in terms of design, ergonomics, and functions. The study aimed to fabricate a safety device for the wood lathe machine to prevent kickback and slow down vibration from the workpiece attached to the lathe machine to avoid the vibration of the workpiece and to avoid an accident to the operator and to avoid damage of the materials. The utility model is planned not exclusively to spare time yet also for the wellbeing of the laborers amid activity. It is designed to hold the workpiece when turning and control the vibration, it can be mounted on the bed of the lathe near the center of the turning planetary.
Źródło:
Archives of Mechanical Technology and Materials; 2019, 39; 59-65
2450-9469
Pojawia się w:
Archives of Mechanical Technology and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a computational model of a lightweight vertical lathe with the use of superelements
Autorzy:
Powałka, Bartosz
Dolata, Michał
Powiązania:
https://bibliotekanauki.pl/articles/94182.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
lathe
FEM
superelements
weak links
Opis:
This article presents a process of developing a computational model of a light construction vertical lathe. The model is made using the finite elements method. Due to the complexity of the machine tool and the optimization of the computation time superelements have been used in the model. The application of this method has reduced the computation time allowing the analysis of many variants of the mutual position of the machine components. The results of the analyzes led to the indication of weak links of the machine tool. After the improvement of the machine tool construction the movement of the tool tip and the workpiece was much smaller.
Źródło:
Archives of Mechanical Technology and Materials; 2019, 39; 1-6
2450-9469
Pojawia się w:
Archives of Mechanical Technology and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Method analysis of the deformation of the shaft and supports of a large, precise lathe – Cutting force excitation
Autorzy:
Dounar, Stanislau
Iakimovitch, Alexandre
Jakubowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/135653.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
FEA
lathe
rotor
centerline
excitation
resonance
Opis:
In this paper, Finite Element Method (FEA) harmonic analysis of the changes caused by raising the centerline of a large, precise lathe is presented. Two standalone dynamic subsystems (“Rotor Shaft” and “Support”) are revealed and the resilience of the “Rotor Shaft” to the raising procedure is stated. The three subsystems of the “Support” class are much more dynamically pliable, only the main eigenmodes of the shaft and supports are excited in the 0…100 Hz range (MR1“Half-wave” and MS1…3 “Radial pecking”). Mounting the lunette suppresses the MR1 peak by a factor of two; therefore the lunette is strongly recommended, with an optional tuned-mass damper (TMD). The support’s resonant frequencies MS1…3 are more deleterious for precision; they should be omitted or weakened using TMD’s that are attached to the supports. For the above conditions, raising the centerline (up to 600 mm) may be included in the lathe renovation program.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 91-98
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lapping system for improvement of geometrical accuracy using lathe machine
Autorzy:
Soe, Y. H.
Tanabe, I.
Iyama, T.
Da Cruz, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/100014.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
lapping
lathe
deviation of form
high quality
Opis:
The geometrical accuracy of the products are essential for high quality and interchangeability. Lapping processing is mostly using for final improvement of geometrical accuracy. Geometrical accuracy includes cylindricity, circularity and straightness. In this paper, lapping processing using a normal lathe was investigated for improvement of geometrical accuracy. Firstly, normal turning process is taken and then, the lapping process is performed using the same lathe. The lapping tool consists of a lapping head made of polypropylene (PP), a coil spring for supplying lapping pressure and holder for fitting on tool post. Lapping slurry is composed by mixing water, PEO (Polyethylene Oxide) and diamond grain. This lapping slurry is supplied between the work piece and the lapping head during lapping processing. The lapping head is made to contact and leave from work piece in regular intervals for catching new grains and removing chips. The optimum lapping condition was investigated for high productivity and high accuracy by experiments. It is concluded from the results that; (1) The geometrical accuracy were improved by using developed lapping system with ordinary lathe machine. (2) The optimum lapping condition was revealed experimentally. (3) The surface roughness and dimensional accuracy are also improved using this developed lapping system.
Źródło:
Journal of Machine Engineering; 2012, 12, 1; 28-40
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decreasing of thermal errors in a lathe by forced cooling of ball screws and a headstock
Autorzy:
Winiarski, Z.
Kowal, Z.
Błażejewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1429161.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
lathe
feed mechanism
cooling
thermal error
calculation
Opis:
The goal of this paper is to present the effective methods of decreasing thermal deformations of a turning centre's structure in order to reduce the thermal error. The design of a machine tool as well as the scope of analyses are described, and calculation methods are specified. The paper also presents the results of computer simulations, concerning studies on the influence of type and parameters of a headstock-cooling liquid on the reduction of spindle displacements. Moreover, the results of feed mechanism's thermal studies are shown, describing the influence of heat generated during the operation of ball screws and their inner liquid cooling, on tool's thermal displacements.
Źródło:
Journal of Machine Engineering; 2008, 8, 4; 122-130
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic finite element analysis of rotor-shaft fastening into a heavy precise lathe
Autorzy:
Dounar, Stanislau
Jakubowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1818744.pdf
Data publikacji:
2021
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
finite element analysis (FEA)
lathe
rotor
renovation
rigidity
reinforcement
Opis:
The results of finite element analysis of large machined rotor fastened into heavy precise lathe are reported. Many design changes are simulated to improve the dynamic rigidity of the machining. Three radial eigenmodes detrimental to the accuracy were revealed: rotor-stock bending at 17.7 Hz (“half-wave”), rotor-lathe bending at 36.1 Hz (“full-wave”), and “support rocking” at 68.1 Hz. The frequency response functions and dynamic rigidities were evaluated. Three compliance issues were revealed: angular flexibility of the spindle console, low stiffness of the lathe bed (with boots), and an excessively slender tailstock. It is proposed to transform the spindle chuck into a table with additional hydrostatic backing, fill the bed cavities with concrete, and redesign the tailstock as a counter-spindle unit. This will decrease the amplitude of the main rotor resonance by 6.3 times and upshift the frequency near two-fold from 17.7 to 35 Hz. The renovated lathe should be able to machine a rotor without a lunette system or overriding the main resonant frequency.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 66 (138); 37-45
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orthotropic model of rolling bearing in modeling lathe spindle dynamics
Autorzy:
Tomaszewski, Jan
Dunaj, Paweł
Powałka, Bartosz
Jasiewicz, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2086957.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
spindle-bearing system
roller bearing
orthotropic material
lathe
machine tool
Opis:
This paper presents a method for simplified modeling of bearing nodes of a lathe spindle using the finite element method. The proposed modeling methodology is based on the use of an orthotropic material model, which is used to reflect the stiffness properties of the bearing, both in the radial and axial directions. The modeling results have been experimentally verified. This resulted in full agreement of the mode shapes, an average relative error of the natural frequency values of 1.48% and high agreement of the receptance function.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 17--31
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEA-analysis of shaft and supports deformations for huge precise lathe. Statics and resonances
Autorzy:
Dounar, Stanislau
Lakimovitch, Alexandre
Ausiyevich, Andrei
Jakubowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/27315928.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
tokarka
MES
wirnik
linia środkowa
rezonans
lathe
FEA
rotor
centerline
resonance
Opis:
Load bearing system simulation is provided for a huge lathe to be renovated. Static and modal analyses are done by FEM. Focus was centerline rising, needed for larger rotor shaft machining. Forces between shaft and three supports were applied. Shaft static stiffness is lowered at 1.15 times only for 600 mm centerline rising. Supports have lost its rigidity at 1.42 times. Concrete pouring into bed cavities is recommended for supports flexibility limitation such as tailstock reinforcement. Robustness of bottom resonances is revealed both for rotor shaft (14.5-18.2 Hz) and supports (42.7-55.4 Hz). Centerline rising is allowed on 300 mm at least. It gives possibility to machine extremely large (up to ø2750 mm) shafts.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 341-348
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lapping for mirror-like finish on cylindrical inner and end surfaces using the lathe with linear motor
Autorzy:
Moe, A. L.
Tanabe, I.
Iyama, T.
Nasu, F.
Powiązania:
https://bibliotekanauki.pl/articles/99806.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
lapping
linear motor lathe
mirror-like surface
high quality
high productivity
Opis:
Lapping is an old traditional machining process that has been useful all along in the human history. Uniform surface finishing by manual hand lapping on cylindrical inner and end surfaces are very difficult. Additionally, the geometrical form accuracy and productivity are lower. In a previous study, the new lapping method for outer cylindrical surface using the lathe with linear motor has been reported. However, this method could not be applied directly for the cylindrical inner and end surfaces. Therefore, lapping for mirror-like finish on cylindrical inner and end surfaces using the lathe with linear motor is investigated. In this study, lapping tool was modified from previous study to be suited for the cylindrical inner and end surfaces. Then, lapping methods for inner and end surfaces were developed for uniform mirror-like finish. Surface roughness and geometrical form accuracy improvement were measured for both surfaces. The optimum conditions for high productivity and high quality mirror-like surfaces were investigated. It was concluded from the results that, the developed lapping system was able to process mirror-like surface on cylindrical inner and end surfaces. Moreover, the optimum conditions for the mirror-like surfaces were revealed experimentally.
Źródło:
Journal of Machine Engineering; 2010, 10, 1; 13-25
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High speed lapping for mirror-like finish using the lathe with linear motor
Autorzy:
Moe, A. L.
Tanabe, I.
Iyama, T.
Nasu, F.
Powiązania:
https://bibliotekanauki.pl/articles/99731.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
high speed lapping
linear motor lathe
mirror-like surface
high quality
high productivity
Opis:
Several machines with linear motor have been developed for high productivity. The characteristics of these machines are high speed, high acceleration and deceleration with stable behaviors of feed. Moreover, mirror-like surface is required to add high quality on the most products. In this study high speed lapping by using the lathe with linear motor was investigated for mirror-like surface. Lapping was performed after turning with the same lathe Lapping tool consists of a lapping head, a spring and holder on the tool post to assemble the linear motor lathe. The spring is used to supply lapping pressure. Lapping slurry consists of water, PEO ( Polyethylene Oxide) and diamond grain. This slurry was supplied between a work piece and lapping head. Then, high speed lapping was performed. During the process, the lapping head temporarily left from work surface in order to catch some new grains and removed some chips. The optimum combination of both the spindle speed and the feed speed was investigated for high quality and productivity experimentally. Surface roughness and form accuracy were measured. It was concluded from the results that (1) Mirror-like surface was obtained by the high speed lapping, and (2) Optimun conditions for efficient high speed lapping was revealed experimentally.
Źródło:
Journal of Machine Engineering; 2010, 10, 1; 26-38
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation on dynamic properties of turning machine
Badanie właściwości dynamicznych tokarki do gwintów falistych
Autorzy:
Dunaj, P.
Chodźko, M.
Powiązania:
https://bibliotekanauki.pl/articles/175943.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modal analysis
dynamics of machine tool
rope threading lathe
analiza modalna
dynamika obrabiarki
tokarka do gwintów falistych
Opis:
Paper present results of experimental investigations on dynamic properties of rope threading lathe TAE 45N. Prototype of this uniquely designed machine tool was delivered for the tests focused on finding dominant mode shape. Influence of the dominant mode on the cutting process is determined. Significant velocity and acceleration of headstock, during machining, can result in high vibration amplitudes, and its influence was estimated.
W artykule przedstawiono wyniki badań doświadczalnych unikatowej tokarki do gwintów falistych TAE 45N. Badania prototypu tej obrabiarki zostały przeprowadzone w celu wyznaczenia dominującej postaci drgań, oddziałujących na realizację procesu skrawania. Przyjęty cel wynika głównie z zastosowanej kinematyki obróbki charakteryzującej się dużą prędkością i przyspieszeniem głowicy narzędziowej, w trakcie jej realizacji.
Źródło:
Advances in Manufacturing Science and Technology; 2017, 41, 1; 21-29
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic of CNC lathe with QC 20 ballbar system
Autorzy:
Józwik, J.
Semotiuk, L.
Kuric, I.
Powiązania:
https://bibliotekanauki.pl/articles/103158.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
CNC machine tool
CNC Lathe QC 20 Ballbar
diagnostics systems
accuracy
geometric errors
deviation
squareness
reversal spikes
backlash
Opis:
This paper presents the evaluation of the influence of the feedmotion speed on the value of selected geometric errors of CNC lathe CTX 310 eco by DMG, indentified by QC 20 Ballbar system. Diagnostically evaluated were: the deviation of the axis squareness, reversal spike, and backlash. These errors determine the forming of the dimensional and shape accuracy of a machine tool. The article discusses the process of the CNC diagnostic test, the diagnostic evaluation and formulates guidelines on further CNC operation. The results of measurements were presented in tables and diagrams.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 96-102
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying rapid heating for controlling thermal displacement of CNC lathe
Autorzy:
Than, Van-The
Wang, Chi-Chang
Ngo, Thi-Thao
Guo, Guan-Liang
Powiązania:
https://bibliotekanauki.pl/articles/27309848.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
rapid heating
CNC lathe
thermal displacement
ball screw
temperature control
szybkie nagrzewanie
tokarka CNC
przemieszczenie termiczne
śruba kulowa
kontrola temperatury
Opis:
Thermal error always exists in a machine tool and accounts for a large part of the total error in the machine. Thermal displacement in X-axis on a CNC lathe controlled based on a rapid heating system is presented in this paper. Positive Temperature Coefficient (PTC) heating plates are installed on the X-axis of the machine. A control temperature system is constructed for rapid heating which further helps the thermal displacement to quickly reach stability. The system then continuously maintains stable compensation of the thermal error. The presented rapid heating technique is simpler than the compensation of machine thermal errors by interference in the numerical control system. Results show that the steady state of the thermal displacement in the X-axis can be acquired in a shorter time. In addition, thermal errors in constant and varying working conditions could be significantly reduced above 80% and 60%, respectively, compared to those without using the rapid heating. Therefore, the proposed method has a high potential for application on the CNC lathe machine for improving its precision.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 3; 519--539
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical use of innovative operations in programming of CNC controlled lathes
Praktyczne zastosowanie innowacyjnych operacji w programowaniu tokarek CNC
Autorzy:
Filipowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/175871.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cnc lathe
eccentric turning
trochoidal turning
polygon turning
rope thread
tokarka CNC
toczenie mimośrodowe
toczenie trochoidalne
toczenie wielokątów
gwint falisty
Opis:
Article presents description of performed attempts of innovative operations used in modern CNC lathes control systems to make specific objects. Problems of making different operations, that requires new attempt to programming are shown. There are shown different methods of use of new operations in different control systems for accomplishing operations like relieving shape mills, making threads not along thread line or turning eccentrics and flattens. Article also shows issues that are results of technological limits in although no limitations from programming site.
W pracy przedstawiono charakteryzację innowacyjnych operacji stosowanych w nowoczesnych układach komputerowego sterowania tokarek. Przeprowadzono badania w celu ich wprowadzenia do wykonywania określonych przedmiotów. Przedstawiono problematykę wykonywania różnych operacji wymagających uwzględnienia nowego podejścia do programowania tokarek. Zaprezentowano różne metody zastosowania nowych operacji w różnych układach sterowania. Prowadzono analizę możliwości ich zastosowania do opracowanych operacji, m.in. zataczania frezów kształtowych, wykonywania gwintów nie po linii śrubowej, toczenia mimośrodów oraz spłaszczeń. Omówiono również problemy spowodowane ograniczeniami technologicznymi z uwzględnieniem braku ograniczeń dotyczących programowania.
Źródło:
Advances in Manufacturing Science and Technology; 2017, 41, 3; 17-24
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining
Autorzy:
Onysko, Oleh
Kopei, Volodymyr
Medvid, Iulia
Panchuk, Vitalii
Pituley, Lolita
Vryukalo, Viktor
Powiązania:
https://bibliotekanauki.pl/articles/2064355.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
drill string
back rake angle
tool-joint tapered thread
pitch diameter
lathe tool
przewód wiertniczy
gwint stożkowy
średnica podziałowa
nóż tokarski
Opis:
The drill string consists of connected drill pipes and other elements. The connection is carried out by screwing of the drill string elements with the help of tool-joint tapered thread. The operational characteristics of the drill pipes depend of the manufacture precision of these tool-joints mostly. The accuracy of the thread is regulated by the accuracy of its profile and the accuracy of its pitch diameter value. The accuracy of the tapered thread manufacturing on the lathe in its depending on the values of the geometric parameters of the lathe tool and the values of deviations of its installation relatively to the workpiece axis is investigated. It is proved that for the tapered thread of form VI profile used for connection of drill pipes with the diameter from 30 mm to 44 mm the most influential factor, in relation to the accuracy of the thread profile is the value of the rake angle. Application of the rake angle value up to -5° according to the research data leads to a deviation from the specified profile of 0.3°, which is more than 35% of the declared standard tolerance on deviations from the profile. Also, the influence of the back rake angle value on the value of the deviation from the standard pitch diameter of the thread is proved. It is proved that the magnitude of the tangential displacement of the nose of the cutter relatively to the axis of the thread up to -0.2 mm can cause a deviation of the profile angle of 0.18°, which is 27% of the standard tolerance.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 268--276
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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