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根据螺旋线的成形原理，推导了普通螺旋线的统一模型，给出了螺旋角与导程的关系方程，讨论了不同刀刃曲线的统一表示和建模方法。
According to the forming principle of helix, a unified model of common helix is deduced. The relation equation between helix angle and lead is given. The unified expression and modeling method of different cutting edge curves are discussed.