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Abstract：
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In this paper, for the aim of practical process planning, the non-steady plasitic flow in the key blocking process of the warm forging technology of a gear of bicycles was numerically simulated by rigid-viscoplastic FEM and mesh rezoning technique. The distributions of stresses, strains, strain rates in workpiece and the forces applied on die surfaces were obtained. The material of the workpiece was A3 steel, the warm forging experiment was completed on a 500T crank press. The load-stroke curves of calculation and experiment agreed with each other very well. During the FEM simulation, the authors proposed a new transformation method for transferring the coordinates from old mesh to the new one. the practice of the authors proved it a more accurate and convenient method.
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Reference：
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[1] Li, G-J., Kobayashi, S., Numericai Analysis of Forming Processes, edited by J. F. T. Pittman, O. C. Zienkiewicz, et al, 1984, chapter 3．
[2] 张柏年,温锻润滑剂研究,《模具技术》,1984． 1,P63-68。
[3] Oh, S. I., et al, Finite Element Mesh Rezoning and its Applications to Metal Forming Analysis, Advanced Technology of Plasticity, Vol. Ⅱ, 1984, 1 PP1051-1058．
[4] Cheng, J. H., Kikuchi, N. A., A Mesh Rezoning Technique for Finite Element Simulations of Metal Forming
Processes, Inter. J, fo Numerical Methods in Engi., Vol. 23, 1986, PP219-228．
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