The protective cover shown in Figure 1 is a dust-proof part at both ends of the main shaft of the transport machine. The material is 08F and the thickness is t=1mm. The part is a box-shaped piece with a shallow flange with a large end of 18 mm and a small end of 13 mm. According to the traditional stamping process: 1 blanking - drawing - trimming. 2 blanking - deep drawing - composite - trimming. Selecting process route 1 requires three submodules