Wyniki wyszukiwania - BazTech

1

Convergence technology for vehicle part surface finishing

Sikulskiy Valeriy, Maiorova Kateryna, Vorobiov Yurii, Fomichev Petro, Myronova Svitlana

Transport Problems

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2023

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T. 18, z. 1

117--127

EN

The subject of this research is convergence technology for the surface finishing of vehicle parts. A literature review has been conducted to carry out a comparative analysis of existing methods for the surface finishing of parts used in the manufacturing of aircraft, hydraulic and pneumatic devices, and other vehicles. Prospects are shown for further research on methods with the aim of creating a complex technology (i.e., convergence) that combines information technologies; nanotechnologies; and thermochemical, electrochemical, and mechanical processing methods. A method is proposed for selecting and combining surface finishing methods according to a five-point expert assessment, which allows the batch processing of vehicle parts. Based on this method, the concept of convergence technology for the surface finishing of vehicle parts is proposed, which includes the impulse thermal energy method, honing, superfinishing, and electrochemical processing. An expanded process is presented for manufacturing parts with high-precision, low-roughness surfaces and a specified microrelief by using electrochemical superfinishing and electrochemical honing. A scheme of the concentration (focusing) of the current flow during electrochemical superfinishing due to the movement of the electrode relative to the part surface is proposed, which enables the effect of surface polishing and the removal of oxidation products. Convergence technology for the surface finishing of vehicle parts will provide parts’ geometric dimensions with micro- and nano-precision and allow the precision machining of small-diameter holes and complex profiles, increased machining accuracy (up to 0.001 microns), the possibility of batch processing, and the possibility of process automation.

2

Colour stability of surface finishes on thermally modified beech wood

Slabejova Gabriela, Šmidriakowá Maria

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2021

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No. 114

116--124

EN

Colour stability of surface finishes on thermally modified beech wood. The paper deals with the influence of the type of transparent surface finish on the change of colour of the surfaces of native beech wood and thermally modified wood. At the same time, the colour stability of three surface finishes on the surfaces of native and thermally modified beech wood was monitored. Beech wood was thermally modified at temperature of 125 °C for 6 hours. The thermal treatment was performed in a pressure autoclave APDZ 240, by the company Sundermann s.r.o in Banská Štiavnica. Three various types of surface finishes (synthetic, wax-oil, water-based) were applied onto the wood surfaces. The colour of the surfaces of native wood and thermally modified wood was measured in the system CIELab before and after surface finishing; the coordinates L*, a*, b*, C*ab and h*ab were measured. From the coordinates measured before and after surface finishing, the differences were calculated and then the colour difference ΔE* was calculated. Subsequently, the test specimens with the surface finishes were exposed to natural sunlight, behind glass in the interior for 60 days. The surface colour was measured at specified time of the exposure (10, 20, 30, 60 days). The results showed that the colour of the wood surfaces changed after application of the individual surface finishes; and the colour difference reached a change visible with a medium quality filter up to a high colour difference. The wax-oil surface finish caused a high colour difference on native wood and on thermally modified wood as well. On native beech wood, the lowest colour difference after exposure to sunlight was noticeable on the synthetic surface finish. On the surface of wood thermally modified, after exposure to sunlight, the lowest colour difference was noticeable on the surface with no surface finish.

3

Beton jako materiał konstrukcyjny i wykończeniowy ścian oraz sufitów

Zdziechowski Jędrzej, Szczęsny Krystian

Materiały Budowlane

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2020

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nr 4

4--7

4

The influence of the brake pad surface machining and finishing on its friction performance : examined by inertia brake dynamometer testing

Dąbrowski T., Kurczyński D., Łagowski P., Warianek M.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

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R. 19, nr 6

399--404, CD

EN

The article describes the influence of brake pads surface machining and finishing on their friction characteristics. It shows the methods of machining and finishing of the brake pads surface and their influence on noise emission and performance. It shows the brake dynamometer test results obtained on three brake pads which have three different types of surface modification and their detailed analysis and comparison.

5

Numerical modelling of behaviour of surface finishing of composite materials

Vosáhlo Josef, Syrovátková Martina, Petrů Michal

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 1

48--53

EN

The article describes and compares the course of the resistance test of a treated surface against the impact of gravel with the model of the test process. The two series of composite samples with surface treatment underwent a so-called gravel test, followed by the evaluation of the test results. Simultaneously with the tests, the material models of the tested composites were created. The input values obtained were used to create a FEM model. The model describes the response of the surface treatment to the impact of the object i.e. gravel of the given size and weight/number. The modelling results were compared with the results of real tests.

6

Elektropolerowanie stali nierdzewnych

Brytan Z.

Stal, Metale & Nowe Technologie

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2017

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nr 1-2

55--57

PL

W artykule scharakteryzowano główne cechy procesu elektropolerowania, podając jego wady i zalety. Opisano wpływ wykończenia powierzchni na skłonność do elektropolerowania oraz wpływ elektropolerowania na chropowatość powierzchni. Opisano również zjawiska występujące w trakcie procesu elektropolerowania i ich wpływ na końcowy efekt wizualny stanu powierzchni. Omówiono preferowane do tego procesu gatunki stali nierdzewnych. Przedstawiono także zastosowania tego procesu w różnych gałęziach przemysłu.

EN

The paper characterises the main properties of the electropolishing process, giving its drawbacks and advantages. The influence of surface finish on the susceptibility to electropolishing and the influence of electropolishing on surface roughness have been described. The phenomena occurring during the electropolishing process, as well as their influence on the final visual effect of the surface, have been also addressed. Stainless steel grades preferred for such a process have been discussed. The applications of the process in different industrial branches have been also presented.

7

Doświadczenia przy projektowaniu i budowie nawierzchni betonowych w Polsce

Mackiewicz P., Szydło A.

Budownictwo, Technologie, Architektura

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2017

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nr 2

38--45

8

Wykończenia powierzchni stali nierdzewnej

Brytan Z.

Stal, Metale & Nowe Technologie

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2015

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nr 5-6

162--166

PL

Prawidłowy dobór typu wykończenia powierzchni stali nierdzewnej stanowi kluczowy czynnik w zapewnieniu długotrwałej i bezawaryjnej pracy elementów wytwarzanych z tego typu stali. Odporność korozyjna stali nierdzewnych wynika bezpośrednio z ich składu chemicznego, lecz może zostać dodatkowo polepszona lub pogorszona przez zastosowanie różnego typu wykończenia powierzchni.

9

Polishing of poly(methyl methacrylate), polycarbonate, and SU-8 polymers

Zhong Z. W., Wang Z. F., Zirajutheen B. M. P., Tan Y. S., Tan Y. H.

Materials Science Poland

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2007

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Vol. 25, No. 1

103--112

EN

Polymers such as poly(methyl methacrylate), polycarbonate, and SU-8 epoxy resin replace silicon as the major substrate in microfluidic system (or BioMEMS) fabrication. Chemical-mechanical polishing is an important technology for many advanced microelectromechanical systems (MEMS) and microoptoelectromechanical system applications. In this study, the chemical-mechanical polishing of polycarbonate, poly(methyl methacrylate), and SU-8 polymers was investigated. Four types of slurry were tested for chemical-mechanical polishing of polycarbonate and poly(methyl methacrylate). Experiments were then designed and performed to investigate the effects of two key process parameters. Experimental results show that an increase in head load or table speed causes an increase in material removal rates. Within the chosen experimental parameter ranges, the variation of table speed introduced a more significant change in material removal rates than that of head load. An analysis of variance was also carried out, and it was found that the interaction of head load and table speed had a significant effect (95% confidence) on the surface finish of polished poly(methyl methacrylate) samples, while table speed had a significant effect on the surface finish of polished polycarbonate samples. Chemical-mechanical polishing is also a process well suited for polishing SU-8 structures with high aspect ratios. Polished polycarbonate, poly(methyl methacrylate), and SU-8 surfaces had nanometer-order surface roughness, acceptable for most MEMS applications.

10

Wykończenie powierzchni posadzek przemysłowych

Rokiel M.

Materiały Budowlane

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2002

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nr 9

41-41

11

An experimental study of the nonlinear dynamics of orthogonal metal cutting

Foong Ch.-H., Wiercigroch M, Deans W. F.

Mechanics and Mechanical Engineering

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2001

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Vol. 5, nr 1

55-68

EN

The elimination of chatter is one of the major aims in machining to improve geometrical accuracy and surface finish. In this study, occurrence of chatter was investigated experimentally using a specially designed rig by examining time histories of the cutting and thrust force components. Broad experimental studies were conducted using brass, cast iron and aluminium samples. It was shown that by changing the horizontal stiffness of the rig, the thrust force variations (in the vertical direction) were completely eliminated for the cast iron samples. A systematic analysis of chip formation for an aluminium alloy is presented.