Self designing and manufacturing special purpose machine tool is one of the effective ways to lower down production cost.

自行设计制造专用机床是降低生产成本的有效方法。

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It can simplify manufacturing technology and make the forming mould with un-special purpose metal cutting machine tool.

简化了机械制造工艺，可在通用机械加工设备条件下进行模具制造。

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So, machining the cavity is quite a task, in the paper we present a method for shaping the cavity with some special toolings on a simple special-purpose machine tool.

本文介绍了如何利用一些特殊的工装、刀具在简易的专用机床上加工该内型腔的方法。

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