Effects of offset angles on the rolling process of a three-roll planetary
mill by three-dimensional finite element analysis

Yeong-Maw Hwang, Ming-Hu Chang and Shyue-Jian Wu

Department of Mechanical Engineering, National Sun Yat-sen University,

Kaohsiung, Taiwan 80424, Repulic of China

Email address: ymhwang@mail.nsysu.edu.tw

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The purpose of this paper is to investigate the plastic deformation behavior of a round bar at the roll-gap during the rolling process of a three-roll planetary mill. The analysis is carried out with the aid of a finite element program MARC adopting the large deformation - large strain theory and the updated lagrangian formulation (ULF). A mesh rezoning procedure is also adopted to improve the uncontrollable running error of elements turning inside out. The mesh system of the whole bar billet is established by using three-dimensional brick elements, and the three-dimensional elastic-plastic finite element model in MARC is chosen to perform the simulations of three-roll planetary rolling processes. In total, five different offset angles are used during the simulation of the rolling process. Numerical results were successfully obtained: - such as the equivalent von-Mises stress and plastic strain distributions, rolling force, rolling moment, billet speeds at the entrance and exit planes of the roll-gap, etc., are useful in designing the pass schedules of the three-roll planetary rolling processes.

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(c) Copyright 2001 Professor F.R. Hall - University of Wolverhampton.