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在精确制造或设计凸轮时,都要求用分析法。例如加工时需要知道凸轮轮廓坐标或刀具的中心坐标;强度计算或磨损计算时需要知道凸轮轮廓的曲率半径等。解决这个问题有些文献已经提出一些不同的方法。这里所提出的就是以凸轮压力角α和升角β为参数,推导系统设计公式的方法。为了计算方便还讨论了几根计算图线的设计问题。凸轮的设计步骤如下:(a)选定从动件的运动规律。(b)按最大压力角和图线(4)或(5)决定凸轮最小尺寸。(c)用公式(1)(2)(3)或(8)(9)计算凸轮理论轮廓坐标。如果滚子尺寸和刀具尺寸不同,还需用公式(6′)和(7′)继续计算。(d)如果需要考虑强度磨损或滚子半径用公式(13)计算凸轮轮廓的曲率半径。因为摆动从动件和移动从动件的凸轮在公式推导的方法上是一样的,所以仅对摆动从动件的凸轮公式推导作了详细的叙述。
In the precise manufacture or design of the cam, require analysis. For example, you need to know the contour coordinates of the cam or the center coordinates of the tool during machining; you need to know the radius of curvature of the cam contour when calculating the strength or wear. Some documents have proposed some different solutions to this problem. What is proposed here is the method of deriving the system design formula taking the cam pressure angle α and the angle β as parameters. In order to facilitate the calculation also discussed the design of several calculation lines of the problem. The design steps for the cam are as follows: (a) The motion of the selected follower. (b) Determine the minimum size of the cam at the maximum pressure angle and the line (4) or (5). (c) Calculate the cam theoretical profile coordinates using equations (1) (2) (3) or (8) (9). If the roller size and tool size are different, you will need to continue the calculation with equations (6 ’) and (7’). (d) Calculate the radius of curvature of the cam profile using equation (13), if you need to consider the strength wear or roller radius. Since the oscillating follower and the moving follower cam are the same in the method of formula derivation, only the derivation of the cam formula of the oscillating follower will be described in detail.