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对于高速凸轮或精度要求较高的凸轮,如等径凸轮、凸轮靠模或检验凸轮用的样板,都需要精确地算出凸轮轮廓各点的坐标。在一般机械原理教材中采用的方法为几何图形分析计算法,用这种方法确定凸轮轮廓各点坐标,须先找出凸轮的理论轮廓坐标,然后再根据凸轮理论轮廓坐标求出凸轮的实际轮廓坐标,因而设计步骤较繁。本文根据工厂提出的设计等径凸论轮廓的问题,介绍用微分几何包络线计算法设计凸轮轮廓。用这种方法可一次求出凸轮的实际轮廓,无需经历中间找凸轮理论轮廓的过程,文中提出了当用包络线计算法设计等径凸轮轮廓在使用凸轮设计方程式时应当注意的问题,並举从动件运动规律为等加速等减速运动情形作了推导分析,最后试算了一个实例。
For high-speed cam or high-precision cam, such as equal-diameter cam, cam cam or test cam model, you need to accurately calculate the coordinates of the cam contour points. The method used in the textbook of general mechanical principles is the geometric analysis method. In this method, the coordinates of the points of the cam profile are determined. The theoretical outline coordinates of the cam must be found first, and then the actual profile of the cam Coordinates, so the design steps more complicated. In this paper, according to the design of the factory proposed convex contour contour, the use of differential geometry envelope calculation method to design the cam profile. In this method, the actual profile of the cam can be obtained at one time without going through the process of finding the theoretical profile of the cam in the middle. In the paper, some problems that should be noticed when using the envelope calculation method to design the equal-diameter cam profile when using the cam design equation Cite this article from the law of movement as acceleration and other deceleration situations made deduction analysis, the final trial of an example.