On the basis of improving cutting-tool angle and operating method, the machining efficiency is raised, the difficulties in processing inside whorl are also solved.

通过改进刀具角度及操作方法，提高了加工效率，解决了内螺纹加工的难点。

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Higher the rake Angle, better is the cutting and less are the cutting forces, increasing the rake Angle reduces the metal backup available at the tool rake face.

前角越大，则切削越好且切削力越小，增加前角可以减少刀具前倾面上产生的金属阻塞。

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The influencing orderliness of the cutting depth and the rake Angle of the tool on cutting qualities are found and the mathematical models are built.

得出了切削厚度与刀具前角这两个切削参数对切削质量影响的规律，得出二者关系的数学模型。

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