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通过对渐开线拉刀切削原理的分析，提出粗精复合小径定心的设计原理，并介绍拉刀的结构特点及加工中的关键工序和保证加工精度的方法。
Based on the analysis of the cutting principle of the involute broach, the design principle of roughing compound small diameter centering is put forward. The structural characteristics of the broach and the key processes of the broaching and the methods to ensure the machining accuracy are introduced.