The motion of the CAM mechanism is

The motion of the CAM mechanism is mainly determined by the CAM profile, and the basic parameters that determine the CAM profile are the motion law of the driven member and the minimum base circle radius limited by the allowable pressure Angle. However, from the perspective of the application of CAM mechanism, only when the CAM is in an active state, the follower has only the travel requirements, and the intermediate process is not specified, it is necessary to choose the displacement law with good performance in all aspects.1. Formation of theoretical profile of CAMCylindrical CAM mechanism is a spatial CAM mechanism. Its contour curve is a spatial curve, which cannot be directly represented in the plane. But the cylindrical surface can be expanded into a plane, after the expansion of the cylindrical CAM into a plane motion CAM.. Planar moving CAM is a special case of disk CAM. It can be viewed as a disk CAM, with its center of rotation at infinity. Therefore, the principle and method of disk CAM contour curve design can be applied to draw the expansion diagram of cylindrical CAM contour curve..In order to find out the actual contour equation of the CAM, the formation of the theoretical contour of the CAM was first studied. When the "reverse motion" analysis method is adopted, the CAM is fixed, and the roller motion follower, on the one hand, moves in reverse relative to the camshaft, and at the same time, relative to its own motion guide, carries out a given motion rule. In the process of this movement, the roller axis occupies a series of positions, and the spatial position set or scanning track forms the theoretical contour of the CAM. The theoretical section is an undeveloped regular surface, which is exactly similar to the normal spiral surface (cylindrical spiral surface) commonly seen in engineering. If the minimum cylindrical radius of the cylindrical CAM is given, it is called the theoretical contour guiding radius of the CAM, and the movement rule of the follower is known, that is, the axis of the slider is relative to the axis of the cylindrical CAM, then the theoretical contour of the CAM can be obtained.. Obviously, this kind of regular surface is the same as the normal spiral surface in engineering, which is the geometric model of the theoretical contour of cylindrical CAM with moving follower..