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摘要：
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压痕是多点成形中特有的成形缺陷 ,是板材多点成形中必须解决的问题。本文首先对多点成形中压痕的形成进行了力学分析 ,给出了抑制压痕的方法 ;并通过典型件的数值模拟及成形实验说明了弹性垫技术及变路径多道成形技术消除压痕缺陷的有效性
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Dimples is a particular defects in Multi\|point forming (MPF) of sheet metal, it is a problem that the designer have to overcome in MPF. In this paper, through the mechanics analysis of dimpling in MPF process, the methods to restrain dimple are suggested. Numerical results and forming test of typical specimens demonstrate that dimples can be eliminated effectively by the techniques of elastic cushion and multi\|step MPF.
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基金项目：
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国家自然科学基金资助项目 (50 2 750 63);;
“十五”国家重点科技攻关资助项目 (2 0 0 1BA2 0 3B1 1 )
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作者简介：
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参考文献：
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1 李明哲,中村敬一基本的な成形原理の检讨日本塑性加工春季讲演会论文集,1992:519～522
2 LiMingzhe,LiuChunguo,ChenQingminResearchonmulti pointformingofthree dimensionalsheetmetalpartsIn:MGeigeretal,AdvancedTechnologyofPlasticityGermany,Springer,1999:189～194
3 李明哲,中村敬一多点成形にぉけゐ不良现象の发生及びその抑制日本第43回塑性加工联合讲演会,1992:425～428
4 李淑慧板材多点成形工艺的有限元仿真研究长春:吉林工业大学博士论文,1999
5 蔡中义板材多点成形过程的数值模拟与最优成形路径研究吉林大学博士论文,2000
6 ZhongyiCai,MingzheLiOptimum pathformingtechniqueforsheetmetalanditsrealizationinMulti-pointformingJournalofMaterialsProcessingTechnology,2001,110(2):136～141
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