Introduce the forming technology of compound extrusion for a shell piece, analyzing the material utilization ratio of two processing ways including extruding process and machine work, calculate and design the extrusion piece drawing of a shell part, and design the die structure.

Through adding public side, setting appropriate cutting route and using proper adding joint to the workpiece,we can improve producing efficiency and workpiece quality, can also reduce the consumption of gas and improve material utilization ratio of steel plate at the same time, the costs of production will be saved for the enterprise.

In the paper, the general arranging method of the blanking parts on the sheet and calculation of the material utilization ratio by AutoCAD software have been discussed for punch die design.