关键词: 弧面凸轮；三坐标测量机；曲线拟合；传动质量评价

Abstract:

Based on the analysis of the mathematic model of globoidal cam profile surface, the coordinate measuring machine was used to inspect the point coordinates of cam profile with the equal radius. A point by point comparision method was described with which all the measured data were used to calculate the position relation between the measuring coordinate system and the cam coordinate system. A least squares B spline fitting method was also introduced to approximate all coordinate data in the cam coordinate system. Based on the conjugate relations at the contact point between the fitted curve and the follower, the real follower movement can be solved to evaluate the transmission quality of globoidal cam profile surface. At last, a practical example was given to show the effectiveness and usefulness of the proposed algorithm.

Key words: globoidal cam, coordinate measuring machine(CMM), curve fitting, transmission quality evaluation