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从动件为摆动圆柱滚子的等速螺线凸轮(通常称为摆动凸轮),广泛应用于自动机床的程序控制。它与一般从动件作直线往复运动的盘形凸轮不同,这种凸轮不是以角度射线分度,而是以凸轮分度圆作为分度原点、以触头的摆动轨迹作为分度弧线来实施分度的。这样便产生了工作曲线理论起止点与实际起止点角度不同而引起的误差△θ_1、△θ_2(见图1)。由于△θ_1≠△θ_2,因此,不能单纯用移动零度角度,直置来修正,这就提出了如何修正摆动凸轮工作曲线的问题。
The follower is a constant-speed helical cam (usually referred to as a swinging cam) that oscillates a cylindrical roller and is widely used in the program control of an automatic machine tool. It is with the general follower for linear reciprocating motion of the disc cam is different from the angle of this cam is not radial indexing, but the indexing of the cam as the origin of graduation, the contact swing trajectory as an index arc The implementation of the indexing. In this way, errors Δθ_1 and Δθ_2 caused by different angles between the starting and ending points of the working curve theory and the actual starting and ending points are produced (see Fig. 1). Because △ θ_1 ≠ △ θ_2, therefore, can not simply move the zero angle, straight to correct, which raised the issue of how to amend the swing cam working curve.