The workpiece is a quadratic bending part with circular arc, and there is a 4mm hole on the straight side of the bending. In addition to the tolerance, its height and radius of bending fillet R 1.2mm should also be guaranteed. From the above analysis of the shape of the bracket, it is not difficult to see that it needs to go through blanking, bending, punching, cutting and other stamping processes, but how to ensure the accuracy of the bending part and ensure that the bending rebound does not affect the size has become the focus and difficulty. The precision of the die designed this time does not need to be very high, and it can meet the requirements if it reaches 10-IT9. According to the process analysis of parts, there are four basic processes: blanking, bending, punching and cutting. According to their sequential combination, the following schemes can be obtained. (1) blanking-bending-punching; Single-process stamping die stamping. (2) blanking-punching-bending; Single-process stamping die stamping. (3) blanking-punching-bending; Stamping with compound die. Schemes (2) and (3) belong to punching first and then bending, and the aperture accuracy of the straight edge cannot guarantee that it will not deform when bending, so punching must be placed after bending, so scheme (1) is selected.