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Abstract：
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This paper,by way of theory analysis,pointed out that, in the process of conical shell forming, the part of blank not contacting with die and punch is not a conical camber, but a positve camber outside, a nagative camber inside, demarcated by the lalitudinal stress boun dary, therefore, the outline of the forming shell will be effected by a comhined form of die and punch. In the light of experiment, the basic principles of choosing the form for industrial applycation were given out.
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AuthorIntro：
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Reference：
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[1] 李硕本,冲压工艺学,机械工业出版社,1982
[2] 中川威雄.板料冲压加工,天津科学技术出版社,1982年
[3] 李硕本,于连仲,曲面零件成形的分析与工艺参数的确定,《锻压技术》,1981． №.3
[4] 肖夫曼,冷压原理,机械工业出版社,1957年
[5] 肖景容,板料冲压,华中工学院出版社,1986
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