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Abstract：
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A multi-step method is introduced to produce a type of ladder-like cylinder workpiece that are difficult to be formed by common stamping processes. At first, a simple contour is formed at the bottom of the cylinder. Subsequently the final shape and dimension are made based on the formed contour. Taking the outer case punching process of the automobile low temperature starter as an example, the paper introduces its application and the problems that should be notified.
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AuthorIntro：
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Reference：
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1 党根茂,骆志斌,李集仁模具设计与制造西安:西安电子科技大学出版社,1995
2 周开华冲压零件展开尺寸计算北京:国防工业出版社,1981
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