Causes and solutions of uneven shape of stamping and drawing parts

In the processing of stamping and drawing parts, stamping factories often encounter uneven shapes of processed products, and sometimes after a long period of research, they can’t find a solution. There are many reasons for the uneven shape of metal stamping and drawing parts. Next, Precision will focus on some of these points to analyze the reasons and solutions for everyone. 1) There is no air hole on the punch. During the punching process, the air in the workpiece is compressed by the punch and cannot be discharged, which makes the shape of the drawn part appear uneven. This reason is usually easily overlooked by many people. The solution is to add ventilation holes on the punch. 2) Uneven billet The surface of the billet is uneven, resulting in uneven surface of the stretched part. The solution is to replace materials with better surface quality. 3) The material rebounds too much. The material rebounds too much, resulting in uneven shape of the stretched part. The solution is to increase the annealing or shaping process. 4) The gap between the punch and the die is too large. If the gap is too large, the working surface of the mold will lose the straightening effect on the workpiece wall, which will make the shape of the workpiece uneven. Therefore, the mold gap should be repaired or replaced with new parts. 5) The negative deviation of the material thickness is too large. If the material thickness is too small, the gap of the mold will be relatively large, resulting in uneven shape. Need to change the material with precise thickness. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automotive stamping parts molds Learn more: Points to note in the design of continuous stamping dies