The paper introduces the debugging process of die and analyzes the reason and preventive measures of dangerous surface cracking and wrinkling in sheet metal forming.

For the wrinkling and cracking problems of automobile covering panel subjected to stamping process,the stamping simulation of the automobile covering panel were carried out based on Dynaform5.

Study on crack of sheet metal in the multi-point forming;

Contrast study of crack on sheet metal under flexible and rigid blank holders in multi-point forming;

Prediction of wrinkling and crack during multi-point drawing forming process for rectangle cup with conical walls;

Cause and precaution of 5052 alloy s small slab drawing breakage;

With regard to produce drawing breakage defect YQ450NQR1 second characters steel,By the fact that the surface defect does appearance,observation,metallographic examination and relevance handicraft inquire into analysis,Find out the drawing breakage defect producing cause and bring forward the measure governing method and taking precautions against.

Finite Element Analysis of Fractures in the Process of Digital Multi-point Forming for Retiary Sheet Metal;

The fracture of sheets is caused by the instability of loading.

Wrinkling and fracture are the major defects in sheet metal forming,and the blank-holder force(BHF) is an important technologic parameter controlling the forming of sheet metal.

Simulating tension crack of rock masses by block element method;

Wrinkle and tension crack may occur in the stamping process of bucket, a curved surface part.