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Based on the superfluous triangle material wrinkle model,the no wrinkle limit criterion of cylindrical cup multi deep drawing is calculated as the prediction and control of the wrinkle limit.According to fracture model,the no fracture limit criterion of cylindrical cup multi deep drawing is calculated as the prediction and control of the fracture limit.Combining the no wrinkle limit criterion with the no fracture limit criterion,the no wrinkle and no fracture limit criterion and diagram on cylindrecal cup multi deep drawing are given as the prediction and control of both wrinkle and fracture limits.In accordance with this can determine the limit deep drawing coefficient and minimum deep drawing coefficient,and can choose the deep drawing coefficient of multi deep drawing,blank holder force and deformation force by optimization choice method.Theory calculation and test data are highly consistent,and suitable for no flange multi deep drawing,flange multi deep drawing and rigid punch expanding
Based on the superfluous triangle material wrinkle model, the no wrinkle limit criterion of cylindrical cup deep drawing is calculated as the prediction and control of the wrinkle limit. According to fracture model, the no fracture limit criterion of cylindrical cup deep drawing is calculated as the prediction and control of the fracture limit. Combining the no wrinkle limit criterion with the no fracture limit criterion, the no wrinkle and no fracture limit criterion and diagram on cylindrecal cup multi deep drawing are given as the prediction and control of both wrinkle and fracture limits. According to this can determine the limit deep drawing coefficient and minimum deep drawing coefficient, and can choose the deep drawing coefficient of multi deep drawing, blank holder force and deformation force by optimization choice method. The calculation calculation and test data are highly consistent, and suitable for no flange multi deep drawing, flange multi deep drawi ng and rigid punch expanding