如果分模面不能在单一平面，利用设计的对称性来减小侧向推力不失为一种好方法。

If the parting line cannot be on a single plane, then it is good practice to use symmetry of the design to minimize the side thrust forces.

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根据开模方向，结合零件的边界描述确定零件上的分模线，进而对分模面进行设计。

According to the parting direction and the description of boundary, the parting line of a body is decided and then the parting surface is designed.

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前言： 为了保证一种既有斜齿轮又有直齿轮零件在注塑成形后能顺利脱模，给出了一套一模两位，点浇口进料， 旋转脱模，胶套式二次分型的双分型面注射模的设计。

To make sure that a plastic part with helical gear and spur gear can be demoulded successfully, an injection mould is designed with double parting faces, point gate feeding and rotating demould.

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