Analyzed the pressing process of the shell part, introduced the structure design points of drawing-trimmingdie.
对壳体的冲压工艺进行了分析，介绍了拉伸、切边模具结构设计的要点。
2
Introduced the characteristics of the gear box case, and determinded the reasonable forming process, designed the drawingdie, the trimming die, the piercing die and the flanging die.