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Common Causes Of Wrinkling During The Drawing Of Metal Stampings
May 15, 2018

Common causes of wrinkling during the drawing of metal stampings.


Stretch depth effect


There is a direct relationship between the material flow resistance along the die opening and the depth of the draw. In the position of the concave and convex curves, if the stretching depth is too large, the uneven distribution of the deformation resistance may be caused, and wrinkling may be avoided.


Adjust the size of the blank holder force


When the wrinkles are evenly generated around the parts, it should be determined that the pressing force is insufficient, and gradually increasing the pressing force can eliminate wrinkles. When stretching the taper and hemispherical parts, most of the material is in the hanging state when stretching begins. Wall wrinkles are easily generated. Therefore, in addition to increasing the blank holder force, the splayed ribs should be used to increase the radial tension in the plate to eliminate wrinkles.


The radius of the die radius


The corner radius of the die is too large, and the smaller the bending resistance is, the smaller the bending resistance of the blank flows through the die radius in the die. The smaller the bending resistance, the easier it is to cause wrinkling. The larger the bending resistance of the small concave mold radius bending resistance, the less likely to wrinkle, but easily lead to cracking and pulling phenomenon of the product.


Accumulation of a large number of production practices proves that the main cause of wrinkling of stamped parts is the accumulation of materials during stretching and the excessive speed of local material movement. When formulating practical solutions, it is necessary to consider the corresponding institutions for adjusting molds from the above aspects, which will yield good results.