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通过建立子结构类型及其各定位关系的描述规则，可以自动得到零件上不能在制造中直接保证的设计尺寸．对设计尺寸进行必要的转换，使得零件上所有的尺寸都能直接保证．这样就可以根据加工设备的能力，判断零件的设计尺寸是否满足制造约束．
Through the establishment of sub-structure types and description of the relationship between the positioning rules, you can automatically get the parts can not be guaranteed in the manufacturing design dimensions. Make the necessary changes to the design dimensions to ensure that all dimensions of the part are directly guaranteed. This can be based on the ability of processing equipment to determine whether the design of the part size to meet manufacturing constraints.