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建立描述加工大轮时切齿过程的坐标系∑＿Ｇ，确定切齿运动参数的单位矢量ｅ＿Ｇ、ｇ＿Ｇ、ｐ＿Ｇ。建立描述加工大轮的刀盘（产形面）的坐标系∑＿（ＧＣ），确定产形面的有关几何特征矢量，并变换到∑＿Ｇ中。根据刀盘参数建立产形面方程。由产形面和大轮齿面的共轭关系，建立大轮齿面方程及确定刀具齿面多数，从而确定加工小轮时大轮齿面计算点的位置，并根据啮合原理确定该点曲率。
The coordinate system Σ_G that describes the process of cutting teeth during machining of a large wheel is established, and the unit vectors e_G, g_G, p_G for determining the cutting motion parameters are determined. Establish the coordinate system Σ_ (GC) which describes the cutter wheel (production surface) of the processing round, and determine the geometric characteristic vector of the production surface and transform it into Σ_G. According to cutter parameters to establish the production surface equation. Based on the conjugate relation between the profile surface and the large tooth surface, the equation of the large tooth surface and the majority of the tooth surface of the tool are established to determine the position of the calculated point of the large tooth surface during the processing of the small wheel, and the curvature is determined according to the principle of meshing .