Because the contact conical surface between the metal and the concave surface in the deformation zone is long and the total frictional resistance on the conical surface is large, the total tension increases despite the small mesh deformation. It can be seen that the reasonable determination of the die cone angle should consider the deformation characteristics of the material in the deformation zone and the friction between the die and the workpiece at the same time, and the determination of the reasonable range of the die cone angle has a direct impact on the drawing process. The process test shows that the reasonable cone angle of the female die is α = 5 ~ 8 for aluminum 3 104H 19 for CCB- 1A can. Analysis of bottom forming process. Bottom forming takes place at the end of the stamping stroke, and reverse re-drawing process is adopted. Fig. 4 is a schematic diagram of bottom forming force, which mainly depends on the nature of friction and the size of blank holder force. Usually, the thickness and strength of materials are a pair of contradictions. The thinner the material, the lower the strength. Therefore, lightweight technology requires reducing the tank bottom diameter and designing a special tank bottom shape. Process testing.