Search Results - "Tomczak, Janusz"

A comparative analysis of hot and cold flashless forging of a stepped shaft using vertically-parted dies by Bulzak, Tomasz, Tomczak, Janusz, Pater, Zbigniew

“…Flashless forging is classified as a precise metal forming technology. The main advantages of this technology are the reduction of the flash allowance and the…”
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Establishment of a new hybrid fracture criterion for cross wedge rolling by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz

“…•The stress states in the axial zone of parts produced by cross wedge rolling are analyzed; these stress states are, for the first time ever, analyzed in the…”
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Conception of a Three Roll Cross Rolling Process of Hollow Rail Axles by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz, Wójcik, Łukasz

“…The article presents an innovative method of forming hollow rail axles by cross rolling (CR) in a 3-roll mill. Assessing the correctness of the concept was…”
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Rotary compression in tool cavity—a new ductile fracture calibration test by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz, Wójcik, Łukasz, Lis, Konrad

“…Ductile fracture is one of the most common failure modes in hot metal forming. It can be predicted by means of so-called damage functions that describe the…”
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Limits of the Process of Rotational Compression of Hollow Stepped Shafts by Bartnicki, Jarosław, Tomczak, Janusz, Pater, Zbigniew

“…This article presents the results of theoretical–experimental testing of the process of rotational compression of hollow stepped shafts. The advantages of the…”
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Rotary compression as a new calibration test for prediction of a critical damage value by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz

“…The article presents the problem of ductile fracture of metals and metal alloys formed in hot working conditions. The basic damage criteria used in modelling…”
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Analysis of a cross wedge rolling process for producing drive shafts by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz

“…The paper discusses the problems of forming parts such as stepped shafts by cross wedge rolling (CWR). In industrial practice, this rolling process is…”
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The influence of hollow billet thickness in rotary compression by Tomczak, Janusz, Pater, Zbigniew, Bulzak, Tomasz

“…The study presents a selection of numerical and experimental results of producing hollow stepped shafts. The first part of this study describes the advantages…”
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Rapid estimation of ductile crack formation in cross-wedge rolling by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz

“…This study investigates the problem of predicting material cracking in cross-wedge rolling (CWR). Fifty-four cases were analyzed using the finite element…”
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Experimental and numerical analysis of helical-wedge rolling process for producing steel balls by Pater, Zbigniew, Tomczak, Janusz, Bartnicki, Jarosław, Lovell, Michael R., Menezes, Pradeep L.

“…The helical-wedge rolling (HWR) process is a new metal forming technique for producing spherical parts of various dimensions. In this paper, the overall…”
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An innovative method for producing balls from scrap rail heads by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz, Cyganek, Zdzisław, Andrietti, Stéphane, Barbelet, Mickael

“…The paper describes an innovative technological solution for producing balls from scrap rail heads. The proposed method consists in performing the following…”
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Problems of forming stepped axles and shafts in a 3-roller skew rolling mill by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz

“…The paper focuses on a new method for forming axisymmetric parts of considerable length in a CNC skew rolling mill. The laboratory rolling mill was used to…”
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Investigation of hot deformation behavior and three-roll skew rolling process for hollow stepped shaft of Al–Zn–Mg–Cu alloy by Zhang, Qingdong, Zuo, Jinrong, Xia, Yingxiang, Tomczak, Janusz, Pater, Zbigniew, Ma, Zheng, Yang, Chen, Shu, Xuedao, Mei, Bizhou, Wang, Guobiao

“…The increasing demand for high-strength lightweight hollow shafts in transportation highlights the need for advanced fabrication techniques. Al–Zn–Mg–Cu…”
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A New Cross Wedge Rolling Process for Producing Rail Axles by Pater, Zbigniew, Tomczak, Janusz

“…Rail axles are large-size parts produced in large batches. Currently, these parts are produced by metal forming techniques such as rotary forging, open die…”
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Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer by Gontarz, Andrzej, Drozdowski, Krzysztof, Michalczyk, Jacek, Wiewiórowska, Sylwia, Pater, Zbigniew, Tomczak, Janusz, Samołyk, Grzegorz, Winiarski, Grzegorz, Surdacki, Piotr

“…Magnesium alloys are highly strain rate sensitive and exhibit good workability in a narrow forging temperature range. Consequently, parts made of these…”
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Novel damage calibration test based on cross-wedge rolling by Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz, Walczuk-Gągała, Patrycja

“…This article presents a new calibration test for damage functions that uses the cross-wedge rolling method (CWR). In this test, the forming conditions were…”
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The Mechanism of Forming Hollow Shafts with Constant Wall Thickness by Three-Roll Skew Rolling by Zhang, Song, Shu, Xuedao, Wang, Jitai, Li, Zixuan, Xu, Haijie, Xia, Yingxiang, Pater, Zbigniew, Tomczak, Janusz, Bulzak, Tomasz

“…To solve the problem of the long forming process for hollow shafts with constant wall thickness (HSCWT), a new process for forming HSCWT, namely three-roll…”
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NUMERICAL MODELLING OF THE ROLLING PROCESS OF INTERNAL TOOTHING OF TOOTHED WHEEL RIMS by Tomczak, Janusz

“…This paper presents results of numerical analysis of rolling process of internal toothing. Numerical simulations of the rolling process were made basing on…”
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Thermomechanical Analysis of a Helical-Wedge Rolling Process for Producing Balls by Pater, Zbigniew, Tomczak, Janusz, Bartnicki, Jarosław, Bulzak, Tomasz

“…The paper presents a complete numerical model of a helical-wedge rolling process for producing balls. The model was designed in Finite Element Method…”
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Physical Modelling of the Ball-Rolling Processes by Pater, Zbigniew, Tomczak, Janusz, Wójcik, Łukasz, Bulzak, Tomasz

“…The objective of the article was to present the state of the problem of physical modelling of the hot-working processes with plasticine as the model material…”
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