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Abstract：
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According to characteristics of ring rolling process, a method dealing with the unknown mandrel velocity and distribution of roll reductions is proposed so that the problems met in the rigid plastic FEM culculation of ring rolling is solved. The comparision of calculated and experimental results shows that the method has the merits of easy handling, exact results and short calculation time. with the FEM method, the ring rolling process and the disgn of ring rolling mill can be guided. Besides ring rolling, the given method can be also used in analysis of other asymmetric rolling processes.
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Reference：
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[1] W. Johnson and A. G. Mamalis Ist.Meta Revs.1979 No.4 pp137-148
[2] 森谦一郎 塑性加工 Vol.24 No.273 pp.1022-1027(1983-10)
[3] 森谦一郎 小坂田宏造 塑性加工 Vol.23,No.260 pp.897-902(1982-9)
[4] Keu-ichiro Mori Susumu SHIMA and Kozo OSAKADA Bulletin of the JSMS Vol.23 No.178 pp.523-529(1980-4)
[5] 许思广 王海文 太原重型机械学院学报,Vol.9 No.3 pp.1-10(1988)
[6] Masujiro HAYAMA Bulletin of the Faculty of Engineering Yokohama National University. Vol. 31 March 1982, pp. 131-143．
[7] #12
[8] A. G. Mamalis W. Johnson and J. B. Hawkyard. J. Mech.Eng. Sci.Vol. 18, No. 4 pp. 197-209(1976)
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