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Abstract：
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In this paper, the author analyses the stress and the strain of pipe under bending condition, and deduces an approximate calculation formula to represent the springback angle,based on the springback theory.
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AuthorIntro：
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Reference：
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1 李硕本冲压工艺学北京:机械工业出版社,1982
2 肖景容,姜奎华冲压工艺学北京:机械工业出版社,1980
3 胡世光板料冷压成形原理北京:国防工业出版社,1979
4 汪大年金属塑性成形原理(第二版)北京:机械工业出版社,1986
5 王同海管材塑性加工技术北京:机械工业出版社,1998
6 远藤顺一,室田忠雄圆管の均等塑性曲げによるへん平化塑性と加工1982,23(260):708～713
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