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Abstract：
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The bar shearing is the first operation of forging deformation.Quality of blanking directly affects the later forging deformation.Especially,precision forging deformation demands higher quality of blank.Common shear dies for blanking can't reach the demand in the respect of blank weight and the surface quality.This paper analysed the reason of shear blade failure of common shear dies,we also suggested some preventive measures.
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Reference：
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1 徐新成等铁路重载货车轴承滚动体温塑性成形研究.锻压技术,2001,26(3):3～5
2 张志文.锻造工艺学.北京:机械工业出版社,1983
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