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Abstract：
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In this paper,the precise calculation formula of contact surface ratio in rotary forging has been deduced, the ideas of real relative decreased amount and approximative relative decreased amount have been presented the first time, the two\|term formula and the three\|term formula representing contact surface ratio have been raised. It has directive meaning for the theory research of rotary forging deeply and practical application of rotary forging reasonably.
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AuthorIntro：
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Reference：
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1 张猛,胡亚民摆辗技术北京:机械工业出版社,1998
2 张猛,胡亚民回转塑性成形工艺及模具.武汉:武汉工业大学出版社,1994
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