Transactions of Materials and Heat Treatment

Title：Stability analysis on continuous stamping for drawing parts based on thermal-mechanical coupling model

Authors： Wei Donglai1 Pan Saian2

Unit： 1.Shanghai Dian Ji University 2.Jilin University

KeyWords： drawing parts continuous stamping thermal-mechanical coupling clearance between punch and die

ClassificationCode：

year,vol(issue):pagenumber：2016,41(7):147-151

Abstract：

In the continuously massive drawing of sheet metal parts, due to frictional heat between dies and blank, the heat accumulation in the die results in the gradually rising temperature of die, then the thermal expansion of dies changes the clearance between die and punch, which has influences on the quality of cold stamping parts, especially deep-drawing parts. The variation of die temperature and die clearance under different stamping times for typical cylindrical deep-drawing parts in a continuous stamping process were investigated based on the thermal-mechanical coupling model by finite element simulation and mathematical analysis. The results indicate that during the continuous stamping, the die temperature rises sharply in initial stage and then gradually weakens to a stable condition. Correspondingly, the die clearance decreases with the increase of die temperature, which leads to a degradation of continuous stamping stability. In practical process, the continuous stamping stability can be strengthened by adding the air cooling or water cooling in the dies, improving the lubrication between dies and blank, and reducing the frequency of stamping.

Funds：

上海市教育委员会上海高校知识服务平台建设项目（ZF1225）

韦东来（1974-），男，博士，讲师

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