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Abstract：
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in this paper, the finite element method was used to study stress distribution in backextrusion punches and stress factors affecting failure of such punches under simple compression con-dition were determined. At the same time, stress distribution in built-up punches was analyzed, andbuilt-up punches under simple compression condition were admitted to have a higher superioritythan those made in one piece.
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Reference：
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（1）天津第六内燃机配件厂天津大学锻压教研室冷挤压凸模的结构与寿命1977．4（2）吕丽萍有限元法及其在锻压工程中的应用西北工业大学出版社1988（3）汪大年金属塑性成形原理机械工业出版社1986（4）王祖唐锻压工艺学机械工业出版社
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