介绍了汽车覆盖件模具CAPP系统的功能和结构，提出了在开发模具CAPP系统中需要注意的一些问题。
Through the introduction of the frame and function of CAPP system about die of automobile cover parts, bring forward some questions when exploiting the system.
变速器是汽车的重要部件之一，主要实现汽车在行进过程中的变速及倒车等功能，它由几十个零件组成，零件之间的装配关系相对复杂。
Gearbox is one of the essential parts of motorcar, which formed from dozens of parts with complex assembly relations, the shift and reverse are realized by it.
汽车桥壳是车辆中重要的安全件和功能件，要有足够的强度和刚度，质量要小。
Automobile axle housing should have enough strength, enough stiffness and light weight as the safety and functional part of motor vehicle.
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