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Investigation of wear resistance of selected materials after slide burnishing process

Dzierwa Andrzej, Gałda Lidia, Tupaj Mirosław, Dudek Kazimiera

Eksploatacja i Niezawodność

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2020

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Vol. 22, no. 3

432--439

EN

The article presents the research on the impact of slide burnishing process carried out with use of various ceramics on friction and wear of steel elements. In addition, surfaces after grinding, lapping and polishing processes were tested. The tribological couple was made of steel discs, toughened to a hardness of 40 ± 2 HRC, and balls made of 100Cr6 steel with a hardness of 62 HRC. The tests were carried out at three sliding speeds: 0.16 m/s, 0.32 m / s and 0.48 m/s. The research proved the possibility of improving selected tribological properties of friction pairs thanks to the use of slide burnishing process and also allowed to establish a number of relationships between the parameters characterizing the surface topography and the tribological parameters.

PL

W artykule przedstawiono wyniki badań wpływu procesu nagniatania ślizgowego realizowanego z wykorzystaniem różnych ceramik na wielkość zużycia oraz siłę tarcia elementów stalowych. Dodatkowo badaniom poddano powierzchnie po procesach szlifowania, docierania oraz polerowania. Skojarzenie materiałowe stanowiły tarcze stalowe ulepszone cieplnie do twardości 40±2 HRC oraz kulki ze stali100Cr6 o twardości 62 HRC. Badania zrealizowano przy trzech prędkościach poślizgu: 0,16 m/s, 0,32 m/s oraz 0,48 m/s. Badania udowodniły możliwość poprawy wybranych właściwości tribologicznych par trących dzięki zastosowaniu procesu nagniatania ślizgowego a także pozwoliły na ustalenie szeregu zależności pomiędzy parametrami charakteryzującymi strukturę geometryczną powierzchni oraz parametrami tribologicznymi.

2

On some aspects of the set theory and topology in J. Puzyna's monumental work

Domoradzki S., Zarichnyi M.

Czasopismo Techniczne. Nauki Podstawowe

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2014

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R. 111, z. 1-NP

85--97

EN

The article highlights certain aspects of the set theory and topology in Puzyna’s work Theory of analytic functions (1899, 1900). In particular, the following notions are considered: derivative of a set, cardinality, connectedness, accumulation point, surface, genus of surface.

PL

W artykule uwypuklono wybrane aspekty dotyczące teorii mnogości i topologii w dziele Puzyny Teorya funkcyj analitycznych (1899, 1900). Odniesiono się m.in. do następujących pojęć: pochodna zbioru, moc zbioru, spójność, punkt skupienia zbioru, powierzchnia, rodzaj powierzchni.

3

Multi-parameter analysis and modelling of engineering surface texture

Petropoulos G. P.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 24, nr 1

91-100

EN

Purpose: Owing to the complexity of machined surface profiles and the contemporary demands for functional characterization, multi-parameter analysis of roughness is recommended by international surface methodology standards, as well as by recent research studies. This article is aimed at presenting a retrospect of works reported by the author on aspects of machined surfaces along with modelling of various texture parameters. Design/methodology/approach: Multi-parameter surface analyses according to the international standards ISO 13565-2: 1997, ISO 12085: 1996 and ISO 13565-2:1996, and with the use of non-standardized parameters as well, are performed on turned and EDM' ed surfaces of different metallic materials over a wide range of machining conditions in order to study: conventional and functional parameter characterization, texture variability, anisotropy and the impact of machining factors on texture parameters. The ultimate goal will be a contribution to surface typology and proposals for selecting representative subsets of parameters in each case considered. Findings: The correlation of each parameter selected is examined with the machining conditions; single and multi-statistical regression models with varying correlation coefficients are developed. New indices to evaluate surface texture anisotropy are proved to be successful. New typology maps for surface control are developed and reduction of roughness parameters in appropriate subsets is achieved. Research limitations/implications: A systematic study of the variation of the parameters selected is conducted regarding three international standards and some "non-common" parameters. Practical implications: Industrial control will benefit by the formulated parameter models, which possess very high coefficients of correlation and a minimum number of representative texture parameters. Originality/value: An integrated view of surfaces obtained by machining processes with quite different physical characteristics and chip formation mechanisms is achieved in the present surface typology oriented study.