Wyniki wyszukiwania - BazTech

1

Physical Simulation of the Mannesmann Effect in the Rolling Process

Wójcik Ł., Pater Z.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 4

1369--1375

EN

The study presents the results of laboratory testing of the phenomenon of cracking in the process of cross rolling. A new method of determining the critical value of the damage function was developed, in which a disc-shaped sample is subjected to rotational compression in a channel. In this method the Mannesmann effect was used. The laboratory tests were conducted for C45, 50HS and R260 grade steel in the temperature range 950°C-1150°C. In order to research various methods of simulating the phenomenon of cracking in the process of cross rolling, physical modelling was also employed. The model material was commercial plasticine, cooled to the temperature 0°C-20°C. Comparing the test results for both the real and model material allowed one to determine the range of the forming temperature for the model material, in which the cracking process is similar to the case of the real material.

2

Wpływ temperatury i smarowania na współczynnik pary trącej plastelina handlowa - kopolimer abs

Wójcik Ł., Pater Z.

Hutnik, Wiadomości Hutnicze

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2018

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Vol. 85, nr 10

362--366

PL

W pracy przedstawiono wyniki badań laboratoryjnych na podstawie których określono warunki tarcia pomiędzy materiałem modelowym, a narzędziami wykonanymi z materiału ABS. W badaniach wykorzystano model tarcia Amontonsa - Coulomba. Jako materiał modelowy przyjęto plastelinę handlową na bazie wosku firmy PRIMO, natomiast narzędzia wykonano metodą druku 3D FDM/FFF. Materiałem budulcowym wykorzystanym do wydruku był ABS P430. Badania laboratoryjne przeprowadzono dla pięciu temperatur (0, 5, 10, 15, 20) ˚C w warunkach tarcia suchego i ze smarowaniem (olej PTFE). Do analizy laboratoryjnej wykorzystano próbki materiału modelowego w kształcie krążków w kolorze czarnym oraz białym. Na podstawie zebranych informacji zaobserwowano, że w warunkach tarcia suchego w zakresie badanych temperatur wartości współczynników tarcia dynamicznego dla obu kolorów plasteliny są bardzo wysokie (μ≈1). Po zastosowaniu smarowania olejem teflonowym otrzymano wyniki odpowiednio dla plasteliny białej: 0˚C - 0,454; 5˚C - 0,411; 10˚C - 0,376; 15˚C - 0,319; 20˚C - 0,223, natomiast dla plasteliny czarnej: 0˚C - 0,44; 5˚C - 0,365; 10˚C - 0,362; 15˚C - 0,382; 20˚C - 0,196. Zastosowanie odpowiedniego smarowania podczas modelowania fizycznego pozwala na otrzymanie dokładniejszych wyników symulacji fizycznej procesów obróbki plastycznej.

EN

The paper presents the results of laboratory tests on the basis of which the friction conditions between the model material and tools made of ABS material were determined. The Amontons -Coulomb friction model was used in the research. As a model material, commercial plasticine based on the PRIMO company was adopted, while the tools were made using the 3D FDM / FFF. The building material used for printing is ABS P430. Laboratory tests were carried out for five temperatures (0, 5, 10, 15, 20˚C) ˚C under dry friction and lubrication conditions (PTFE oil). For laboratory analysis, samples of model material in the shape of discs in black and white were used. Based on the collected information, it was observed that in conditions of dry friction in the range of the tested temperatures, the values of dynamic friction coefficients for both colors of plasticine are very high (μ≈1). After applying Teflon oil lubrication results were obtained for white plasticine, respectively: 0˚C - 0.454; 5˚C - 0.411; 10˚C - 0.376; 15˚C - 0.319; 20˚C - 0.223, while for black plasticine: 0˚C - 0.44; 5˚C - 0.365; 10˚C - 0.362; 15˚C - 0.382; 20˚C - 0.196. The use of appropriate lubrication during physical modeling allows to obtain more accurate results of physical simulation of plastic forming processes.

3

Comparison analysis of cockroft – latham criterion values of commercial plasticine and C45 steel

Wójcik Ł., Pater Z.

Acta Mechanica et Automatica

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2018

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Vol. 12, no. 4

286--293

EN

The paper presents and compares the results of theoretical and experimental research in the field of cracking of model material (commercial plasticine) and C45 steel in hot forming conditions. The aim of the research was to determine the limit values of the CockroftLatham integral for both materials. The presented research methodology includes experimental tests (tensile tests) and numerical simulations carried out in the DEFORM-3D program. For laboratory tests, axially symmetric samples made of C45 steel and model material were used. On the basis of the obtained experimental and numerical results, a comparative analysis of both materials was carried out.

4

Physical analysis of cross-wedge rolling process of a stepped shaft

Wójcik Ł., Pater Z.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 4

60--67

EN

The paper presents experimental- model research results on the process of cross-wedge rolling of an axially-symmetrical element (stepped shaft). During research plastic mass on the basis of waxes in black and white colour was used. The aim of this experimental research was to determine the best option of forming in terms of values obtained and the course of forces. Physical examination was carried out using specialist machines, i.e. model and a laboratory cross-wedge rolling mill. Experimental analysis was carried out using billets with the temperature of 15°C, whereas the actual process was carried out for billet from C45 carbon steel of temperature 1150°C. The study compared the dimensions of the components obtained during rolling tests and forming forces obtained in the result of physical modeling with forces obtained during real tests.

5

Materiały stosowane w modelowaniu fizycznym

Gronostajski Z., Hawryluk M.

Przegląd Mechaniczny

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2005

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nr 7-8

42-46

PL

W pracy przedstawiono przebiegi naprężenia uplastyczniającego w funkcji odkształcenia rzeczywistego uzyskane w próbie spęczania materiałów modelowych, takich jak: plastelina oraz syntetyczny wosk filia modyfikowanych dodatkami parafiny, kaolinu, lanoliny oraz kredy. Zbadano również wpływ zmiany prędkości i temperatury odkształcania na naprężenie uplastyczniające.

EN

In paper the courses of flow stress, obtained in knock-down test, as a function of strain of modeling material such as plasticine and synthetic wax - filia were presented. Additives like paraffin, kaolin, lanolin, and chalk modified modeling materials. The influence of temperature and strain rate on the flow stress was also determined.

6

Badania nad uzyskaniem nowego materiału modelowego bazującego na plastelinie

Świątkowski K.

Przegląd Mechaniczny

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2001

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nr 4

28-31

PL

Przedstawiono wstępne wyniki badań nad możliwością uzyskania nowego materiału modelowego bazującego na krajowej plastelinie, opracowano procedury uzyskiwania materiału doświadczalnego w postaci mieszanin plasteliny z kaolinem oraz kredą, z mieszanin tych otrzymano próbki do badań charakterystyk mechanicznych w procesie spęczania.

EN

Preliminary results of studies on a possibility of obtaining a nw modelling material based on domestic plasticine. Procedures of obtaining an experimental material in the form of mixtures of plasyicine with kaoline and chalk. From these mixtures test pieces were prepared for examining mechanical characterictics in an upsetting process. The relationships obtained can be a basic for seeking cheap modelling materials simulating the behaviour of metals in a process of their plastic working.