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Wyświetlanie 1-15 z 3631
Tytuł:
Surface irregularities as a complex signal of tool representation together with uneven displacement in respect to the workpiece
Autorzy:
Boryczko, A.
Rytlewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/221576.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface irregularities
surface profile
tool profile
surface disturbances
tool displacements
Opis:
In a dynamic machining process, distortion in surface irregularity is a very complex phenomenon. Surface irregularities form a periodic representation of the tool profile with various kinds of disturbance in a broad range of changes in the height and length of the profile. To discern these irregularity disturbances, interactions of the tool in the form of changes perpendicular and parallel relative to the workpiece were analyzed and simulated. The individual kinds of displacement of the tool relative to the workpiece introduce distortions in the changes of height and length. These changes are weakly represented in standard height and length irregularity parameters and their discernment has been found through amplitude-frequency functions.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 133-144
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 4₃ configuration of lines and conics in ℙ⁵
Autorzy:
Szemberg, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1311649.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
configuration
Kummer surface
abelian surface
Opis:
Studying the connection between the title configuration and Kummer surfaces we write explicit quadratic equations for the latter. The main results are presented in Theorems 8 and 16.
Źródło:
Annales Polonici Mathematici; 1994-1995, 60, 2; 145-158
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Flap Peening Speed on the Surface Quality and Micro Hardness of Aircraft Aluminum Alloys
Autorzy:
Shaban, Nabeel Abu
Alshabatat, Nabeel
Al-Qawabah, Safwan
Powiązania:
https://bibliotekanauki.pl/articles/2125528.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface roughness
surface quality
material processing
flap speed
surface hardness
Opis:
Flap peening (FP) is a cold working technique used to apply a compressive force using small shots, this will lead to enhance the surface properties that it can sustain for long life during working conditions. In this study, several aircraft aluminum alloys materials namely; 2219 T6, 2024 T6, 7075 T6, and 6061 T6 were flap peened under different rotational speeds. The effect of rotational speed on the average surface roughness (Ra) and average surface micro hardness have been investigated. As seen by the Scanning Electron Microscope SEM phots that the hardness of peened layer is increased. It was found that as the flap peening speeds increase the percent change in surface roughness (Ra) increases, and the percent change in surface micro hardness decreases. The maximum increase in Ra occurs in 2219 T80 and the minimum in 6061 T6 alloys, and for hardness, it is reported that the maximum occurs in 6061 T6 and the minimum in 2019 T80 alloy.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 855-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A low-cost, simple optical setup for a fast scatterometry surface roughness measurements with nanometric precision
Autorzy:
Kucharski, D.
Zdunek, H.
Powiązania:
https://bibliotekanauki.pl/articles/200883.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
scatterometry
surface texture
optical measurement systems
surface metrology
surface roughness
Opis:
We present a prototype of a simple, low-cost setup for a fast scatterometric surface texture measurements. We used a total integrated scatter method (TIS) with a semiconductor laser (λ = 638 nm) and a Si photodiode. Using our setup, we estimated the roughness parameters Rq for two reference surfaces (Al mirrors with flatness λ/10) and seven equal steel plates to compare. The setup is easily adaptable for a fast, preliminary manufacturing quality control. We show is possible to construct a low-cost measurement system with nanometric precision.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 485-490
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metrological Aspects of Surface Topographies Produced by Different Machining Operations Regarding Their Potential Functionality
Autorzy:
Żak, K.
Grzesik, W.
Powiązania:
https://bibliotekanauki.pl/articles/220573.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface metrology
surface topography
surface roughness
areal parameters
machining operations
Opis:
This paper presents a comprehensive methodology for measuring and characterizing the surface topographies on machined steel parts produced by precision machining operations. The performed case studies concern a wide spectrum of topographic features of surfaces with different geometrical structures but the same values of the arithmetic mean height Sa. The tested machining operations included hard turning operations performed with CBN tools, grinding operations with Al2O3 ceramic and CBN wheels and superfinish using ceramic stones. As a result, several characteristic surface textures with the Sa roughness parameter value of about 0.2 μm were thoroughly characterized and compared regarding their potential functional capabilities. Apart from the standard 2D and 3D roughness parameters, the fractal, motif and frequency parameters were taken in the consideration.
Źródło:
Metrology and Measurement Systems; 2017, 24, 2; 325-335
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free-form surface data registration and fusion. The case of roughness measurements of a convex surface
Autorzy:
Zawada-Tomkiewicz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/221231.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stitching data
surface measurement
free-form surface
Opis:
Combining surface measurement data from individual measurements of surface fragments is an issue that has been recognized for flat surfaces. The connection takes place on the principle of making ‘overlap’ measurements according to a specific measurement strategy, and then the algorithm synthesizes the measurement data for the common part (data fusion). This paper presents a method of combining partial data into one larger set using image processing methods. The purpose of the analysis is to combine surface data of a more complex shape in terms of surface roughness and waviness. A successful attempt was made to combine surface measurement data located on a cylindrical surface - convex surface. A rotated table was designed and used for surface data acquisition. The datasets were acquired with the use of CCI 6000 (366μm - 366μm) with the assumed overlapping of at least 20%. The measurement datasets were first pre-processed: filling in non-measured points, levelling and form removing were applied. For such processed datasets, the common part was identified (data registration) and then the data fusion was performed. An example of stitching the surface datasets shows usefulness of the presented methodology.
Źródło:
Metrology and Measurement Systems; 2019, 26, 2; 323-333
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of grinding conditions on the topographic characteristic of machined surfaces
Autorzy:
Żak, K.
Powiązania:
https://bibliotekanauki.pl/articles/100111.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
surface texture
surface roughness
hard machining
grinding
Opis:
This paper compares the ability of grinding processes to enhance functional properties of the surface textures produced. The main objective of such a comparison is to facilitate the decision about precision grinding operations. The experimental study performed includes two grinding operations using electro-corundum Al2O3 and CBN wheels. For this purpose, the topographic features of ground surfaces with the Sa roughness parameter of about 0.2?m were compared. Apart from the set of 3D roughness parameters, the frequency, fractal, wavelet and motif characteristics were analyzed.
Źródło:
Journal of Machine Engineering; 2014, 14, 2; 47-56
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of cutting parameters on surface roughness and productivity when milling wood materials
Autorzy:
Loc, Nguyen Huu
Hung, Trinh Quoc
Powiązania:
https://bibliotekanauki.pl/articles/2052204.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
surface roughness
response surface
milling method
optimization
Opis:
The quality of the machined surface is one of the most important criteria when products are processed. For different materials, there are differentially fitting processing technologies and cutting modes to ensure that the parts have surface roughness in the allowed value range. In this paper, the research on surface roughness of machining tropical wood by milling method is presented. It is necessary to establish and solve the optimal problems with such aims as the highest surface quality, minimum cutting power and the highest productivity in the optimal cutting mode. Using a great amount of experimental planning and many constrained nonlinear optimization problem solving methods, the authors built a process and solved the problem to determine the optimal cutting parameters such as feed per tooth Sz, tool tip radius ρ, depth of cut h, etc. that satisfy the above object. Research object is tropical wood chukrasia and this is the database to design woodworking machines by milling method and choose a reasonable working mode when processing on CNC machines.
Źródło:
Journal of Machine Engineering; 2021, 21, 4; 72-89
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advancements in near-surface seismicreflection acquisition
Autorzy:
Miller, B. E.
Tsoflias, G. P.
Steeples, D. W.
Powiązania:
https://bibliotekanauki.pl/articles/115499.pdf
Data publikacji:
2010
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
near-surface seismology
near-surface seismic refl ection
near-surface seismic acquisition
Opis:
3-D seismic refl ection methods have been established as the predominant seismic method for hydrocarbon exploration. While this is true for exploration scale surveys the same is not yet true for near-surface seismic refl ection investigations. While the benefi ts of employing 3-D methods have been documented they are yet to be fully adopted by the near-surface community. There are a number of reasons for this; primary among them is the labor involved with planting and re-cabling large numbers of geophones. The amount of time and labor involved in these operations has been a direct hindrance for 3-D investigations of the near-surface. To help overcome these limitations The University of Kansas geophysics group has developed a portable, automated seismic data acquisition system, known as the autojuggie. The autojuggie allows for effi cient ultra-shallow seismic imaging and is capable of quickly performing non-invasive, high-resolution 2-D or 3-D seismic surveys by deploying a dense array of geophones.
Źródło:
Challenges of Modern Technology; 2010, 1, 1; 14-18
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System Talysurf CCI 6000 - metodyka analizy cech powierzchni z wykorzystaniem TalyMap Platinium
System Talysurf CCI 6000 - methodic of analysis surface feature with using TalyMap Platinium
Autorzy:
Cincio, R.
Kacalak, W.
Łukianowicz, C.
Powiązania:
https://bibliotekanauki.pl/articles/154704.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pomiary powierzchni
ocena powierzchni
surface measurement
surface assessment
Opis:
W artykule przedstawiono zasadę działania, metodykę przeprowadzania pomiarów oraz przykładowe możliwości analiz wykonywanych za pomocą ultraprecyzyjnego sytemu pomiarowego Talysurf CCI 6000 produkcji firmy Taylor-Hobson znajdującego się w Laboratorium Mikroinżynierii i Nanoinżynierii Katedry Mechaniki Precyzyjnej Politechniki Koszalińskiej. Artykuł zawiera również opis aplikacji do sterowania systemem Talysurf CCI 6000 pod nazwą TalyscanCCI oraz aplikacji do analizy wyników po-miarów TalyMap Platinium. Dodatkowo przedstawiono możliwości opraco-wywanej aplikacji "Realsurface v1.0", która uzupełnia możliwości anali-tyczne produktów Taylor-Hobson. Artykuł zakończono przedstawieniem różnych możliwości oprogramowania Talymap Platinum oraz wnioskami.
In article introducted rule operation, realizing methodic of measurement and example possibilities of analyses realized with ultraprecise measuring sytem Talysurf CCI 6000 production by Taylor-Hobson, being found in Laboratory Microengineering and Nanoengineering of the Mechanics Precise Department of Koszalin University of Technology. The article contains also description of control application of system Talysurf CCI 6000 under name TalyscanCCI and application to results analysis of measurement TalyMap Platinium. Additionally introduced possibilities elaborated application "Realsurface v1.0" which supplements analytic possibilities of products Taylor-Hobson. The article was finished presentation of different possibilities of software Talymap Platinum and conclusions.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 4, 4; 187-191
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of transient elastohydrodynamic lubrication subjected to sinusoidal dynamic loads for rough contact surfaces
Autorzy:
Abd-Alsamieh, Mohamed F.
Powiązania:
https://bibliotekanauki.pl/articles/2106001.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
transient elastohydrodynamics
surface roughness
sinusoidal load
wavy surface
Opis:
The purpose of this paper is to study the behaviour of transient elastohydrodynamic contacts subjected to forced harmonic vibrations, including the effect of surface waviness for concentrated counterformal point contact under isothermal conditions. Profiles of pressure and film thickness are studied to reveal the combined effects of sinusoidal external load and surface roughness on the lubrication problem. The time-dependent Reynolds' equation is solved using Newton–Raphson technique. The film thickness and pressure distribution are obtained at different snap shots of time by simultaneous solution of the Reynolds’ equation and film thickness equation including elastic deformation and surface waviness. It is concluded that the coupling effects of the transient sinusoidal external load and wavy surface would result in increase in modulations of the pressure and film thickness profile in comparison to the case where the smooth contact surfaces are subjected to sinusoidal external load.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 2; 162--168
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Ozonation Process for Shaping the Energy Properties of the Surface Layer of Polymer Construction Materials
Autorzy:
Kłonica, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/2027827.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
surface layer
ozone
polymer material
surface free energy
Opis:
The properties of the surface layer of construction materials are very important for making adhesive bonds. The article presents the test results for surface free energy in PA6 polyamide subjected to surface layer modification using the ozonation process. To develop the surface geometrically, the samples were subjected to mechanical processing. The comparison of results demonstrated that ozonation is an efficient and eco-friendly method of modifying the surface layer. The article also presents the comparison results for measurements of selected surface roughness parameters.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 212-219
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of surface quality for chosen milling strategies when producing relief surfaces
Autorzy:
Varga, J.
Stahovec, J.
Beno, J.
Vrabeľ, M
Powiązania:
https://bibliotekanauki.pl/articles/102765.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
relief surface
fragmentation of the surface
milling strategies
Opis:
The paper deals with design and modeling of the relief surfaces that are produced in milling. Modeled and real surface quality is presented for the chosen fragments of the relief surfaces. Fragmentation of the relief surfaces has been made by the surface sampling. Milling strategies are compared with regard to surface formation. Surface quality was checked with regard to applied cutting conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 22; 37-41
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Topography of Inconel 718 Alloy in Finishing WEDM
Autorzy:
Buk, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2022497.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
WEDM
Inconel 718
surface topography
nanohardness
surface layer
Opis:
The properties of Iconel 718 determine its application for parts operating in extremely tough conditions. The difficulties when machining nickel-based superalloys allowed in recent years for researching other machining methods. One of the proposed methods is Wire Electrical Discharge Machining (WEDM). It becomes possible to minimize or eliminate such problems associated with electrical discharge machining as microcracks, forming of a white layer, or high surface roughness. One way to avoid these issues is to apply finishing machining. The literature indicates that the peak current is the main parameter responsible for shaping the machined surface in finishing WEDM. Furthermore, few works focus on the electrode’s infeed, in particular there are not many papers regarding the influence of the infeed on the machined surface parameters. Therefore, the paper aims to investigate on the influence of the peak current and infeed during finishing WEDM on the surface properties of Inconel 718. The paper presents measurements of selected surface topography parameters and Abbot Firestone curves (AFC). The presented plots allowed to determine the ranges of the process parameters for which the lowest surface roughness values were achieved. Cross-sections were performed to measure the thickness of a white layer. Nanohardness HV0,01 measured by Berkovich tip was recorded to determine the size of a heat affected zone (HAZ). The correlation between the peak current Ic and the infeed z regarding the machined surface quality was presented.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 1; 47-61
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 3631

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