undercut
... 模型pattern 模型凹穴undercut 模型板pattern plate ...
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相同的原理用到这儿关于推出任何内部模型凹穴，也就是说零件在顶出时必须能自由扩张答应形成的模型凹穴通过型芯的约束。
The same principle applies here as to stripping any internal undercut i. e. the molding must be free to expand during ejection to permit the molded undercut to ride over the restriction on the core.
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