关键词: 弧面分度凸轮；建模；自动换刀装置；运动仿真

Abstract:

Based on converse thinking,a new modeling method was presented in allusion to the fact that the modeling and manufacturing of complex globoidal indexing cam were difficult.The theoretical profile equations of globoidal indexing cam were derived with the application of conjugate surface theory,differential geometry,and coordinate transformation principle. The principle of the new modeling method was analyzed.Theoretical profiles were built
up on the blank model of globoidal indexing cam combined with movement laws of driven turret and working profiles were obtained by normal offset of the theoretical profiles and solid cutting operation.Therefore,the accurate model of globoidal indexing cam was finished.A modeling example of the complex multihead globoidal indexing cam used in automatic tool changer of NC machining center was carried out by this method and the kinematics simulation was presented.The result is agree with the design requirements,showing validity and feasibility of the method.

Key words: globoidal indexing cam;modeling;automatic tool changer;kinematics simulation