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本文讨论了用展成法加工非圆孔的原理，以加工等厚形三面孔为例，介绍了插刀设计与刃磨方法。
In this paper, the principle of non-circular hole machining is discussed in this paper. Taking the processing of equal-thickness three-face holes as an example, the design and grinding method of cutting insert are introduced.