Based on the deformation characteristic of regular polygonal box stamped parts and the superfluous triangle material wrinkle model, the criterion of regular polygonal box stamped parts without wrinkle was deduced and used to predict and control the wrinkle limit. According to the fracture model, the criterion of regular polygonal box stamped parts without fracture was deduced and used to predict and control the fracture limit. Combining the criterion for stamping without wrinkle with that without fracture, the stamping criterion of regular polygonal box stamped parts was obtained to predict and control the stamping limit. Taken the stainless steel 0Cr18Ni9 (SUS304) sheet and the square box stamped part as examples, the limit diagram was given to predict and control the wrinkle, fracture and stamping limits. It is suitable for the deep drawing without flange, the deep drawing and stretching combined forming with flange and the rigid punch stretching of plane blank. The limit deep-drawing coefficient and the minimum deep-drawing coefficient can be determined, and the appropriate BHF (blank holder force) and the deep-drawing force can be chosen. These provide a reference for the technology planning, the die and mold design and the equipment determination, and a new criterion evaluating sheet stamping formability, which predicts and controls the stamping process, can be applied to the deep drawing under constant or variable BHF conditions.
参考文献
[1] | 雷君相.正多边形盒零件冲压成形凸缘变形区的应力分布计算[J].塑性工程学报,2002(03):39-42. |
[2] | Wang Xiao-pei.Stamping Handbook[M].Revised ed.Beijing:China Machine Press,1990 |
[3] | Chinese Mechanical Engineering Society.Forging and Stamping Handbook[M].北京:机械工业出版社,2002 |
[4] | Lei Jun-xiang .Prediction and Control of Both Wrinkle Limit and Fracture Limit on Cylindrical Cup Deep-Drawing[J].Journal of University of Science and Technology Beijing(English Edition),1998,5(04):237-240250. |
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