The cause of warpage of precision stamping and bending parts and the solution ``hardware''

Reasons for warpage of precision stamping and bending parts: Compression deformation occurs on the outside of the bending line due to tensile stress, and there are opposite stress and strain on the inside, so the product will be saddle-shaped. When H/t is less than 6-7, the warpage rate H/t is 2/1000 when it is large, and when it is greater than 6-7, the warpage rate is 1/1000 or less. It has nothing to do with material and rolling direction. The solution to the warpage of precision stamping and bending parts: 1. When the warpage of the thin plate is very small, the cavity should be close to the middle part of the bending line. 2. When the processing conditions are strict, first measure the amount of warpage, and secondly, make the punch reverse bending only according to the amount of warpage. In this reverse bending method, a bush is clamped between the punch and the die base and fixed at both ends.