复杂弧面分度凸轮精确建模的新方法  

A New Accurately Modeling Method for Complex Globoidal Indexing Cam

作　　者：丛明[1] 刘静[1] 李全普[2] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,大连116023 [2]大连机床集团有限责任公司,大连116620

出　　处：《中国机械工程》2009年第6期669-673,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50675027);大连市科技局科技计划资助项目(2006A12GX003)

摘　　要：针对复杂弧面分度凸轮精确建模困难、制造难度大的实际情况,基于逆向思维提出一种对弧面分度凸轮进行精确建模的新方法。应用共轭曲面原理、微分几何学和坐标变换原理获得弧面分度凸轮的理论轮廓曲面方程;分析了新方法的建模原理,结合分度盘运动规律,在凸轮毛坯模型上建立了理论轮廓曲面,对其进行法向偏置、实体切除操作得到工作轮廓曲面,获得精确的凸轮模型。基于Pro/E软件,给出了用于数控加工中心自动换刀装置中的多头复杂弧面分度凸轮的建模实例,并进行了运动仿真分析,结果满足设计要求,验证了该方法的正确性和可行性。Based on converse thinking, a new modeling method was presented in allusion to the tact 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.

关 键 词：弧面分度凸轮 建模 自动换刀装置 运动仿真 

分 类 号：TH112.2[机械工程—机械设计及理论]