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Pull deep pieces
Pull deep pieces

Wrinkle is the convex part of the drawing depth when drawing deep, which is subjected to tangential compressive stress, which causes the continuous bending phenomenon of wave shape. The dangerous part of the cleavage is the excessive fillet of the side wall and the bottom, and when the tensile stress exceeds the tensile strength of the material, it will be cracked here to prevent the measure from: 1, choose a reasonable drawing coefficient. 2, concave, convex die at the corner must have rounded corners, so that the material is easy to flow here. 3, control concave, convex mold clearance, generally go to z= (1.1~1.2) 4, pay attention to the lubrication of the mold, pull deep to add lubricant, can reduce the side wall part of the drawing depth stress, but also reduce mold wear. 5, the use of crimping ring for drawing depth, can effectively prevent drawing deep wrinkle.

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