The continuous bending phenomenon of wave shape is made by the effect of tangential compressive stress. The part of the crack risk is the excessive fillet of the side wall and the bottom, and when the tensile stress exceeds the strength of the data, it will be cracked here to avoid the ability to move from a measure: 1, choose a reasonable drawing coefficient. 2, concave, convex die at the corner must have rounded corners, so that the data in the simple activity here. 3, control concave, convex mold clearance, generally go to z= (1.1~1.2) 4, pay attention to the smooth mold, to add a smooth agent when drawing, can drop the side wall part of the drawing stress, but also to reduce mold wear. 5, the use of crimping ring for drawing depth, can be useful to avoid drawing deep wrinkle.

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