Check the relevant manuals, but no matter how to check and calculate, you can't get accurate data, because the batches of stainless steel plates of the same specification are different, and the elasticity, plasticity and various properties of stainless steel plates will not be exactly the same, so there is only one way, experiment. First, several stainless steel plates are laid, and the calculated data are used as the upper and lower dies for experiments, and then corrected. In addition, both sides of the concave die on the drawing should be rounded, otherwise the surface of the molded workpiece will be pressed out of the indentation.