产品变型设计的基本思想就是通过改进已有的系列产品或模块来适应新的设计需求。
The main idea of variant design is to adapt the existing product or module to the new requirements.
通过对进给油缸结构特点的分析，提出基于变型设计的理论，采用参数化的方法开发CAD系统。
By using of the theory in view of the deformed design and adopting the method of parameter synthesis to develop CAD system through the analysis of the structural feature about feeding oil_vat.
通过主模型和主文档进行变型设计，派生出定制产品零部件的工程图、工艺过程规划和NC程序等，达到定制产品快速设计的目的。
The drawing items, process planning and NC code will be derived from master model and master document by product variant design. As a result, the design of customized product can be finished rapidly.
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