直线逼近的自定心中心架凸轮机构设计与加工  

Design and Machining of Self-Centering Center Rest Cam Mechanism Based on Linear Approximation

作　　者：谢祖强[1] XIE Zu-qiang(School of Mechanical and Intelligent Manufacturing,Fujian Chuanzheng Communications College,Fuzhou Fujian 350007,China)

机构地区：[1]福建船政交通职业学院机械与智能制造学院,福建福州350007

出　　处：《机械研究与应用》2021年第5期77-82,共6页Mechanical Research & Application

基　　金：福建省教育厅中青年教师教育科研项目:基于误差控制的中心架平移凸轮廓线加工及其接触强度研究(JAT201077);福建省高等职业院校智能装备应用技术协同创新中心:智能装备应用技术协同创新项目(闽教科[2016]71)

摘　　要：根据自定心中心架的工作原理,利用速度瞬心法建立了中心架凸轮实际廓线方程,编程计算与文献公式比较,验证了公式正确性。基于凸轮理论廓线推导凸轮实际廓线一阶、二阶导数及曲率半径计算公式。分析直线逼近弓高误差计算原理,基于牛顿迭代法设计了非圆曲线等间距直线逼近算法。编程计算得到中心架凸轮廓线直线逼近点坐标值并验证算法正确性。将凸轮直线逼近点坐标值导入CAD软件中生成实体模型,再导入到MasterCAM软件中生成数控加工代码,经济、高效地实现中心架凸轮机构高精度加工。Based on the working principles of the self-centering center rest,the actual profile equation of the center rest cam is established by using the velocity instantaneous center method;correctness of the formula is then verified by programming calculation and comparison with the formulas given in reference. Based on the theoretical profile of cam,the calculation formulas of the first and second derivatives and curvature radius of the actual profile of cam are derived. Based on analyzing the calculation principle of the chord error of the non-circular curve linear approximation,the algorithm of equal distance straight line approaching non-circular curve is designed based on the Newton iterative method. Through the programming calculation,the coordinate values of the approximation points of the convex contour line of the self-centering center rest are obtained,and correctness of the algorithm is then verified. The coordinate values of straight line approaching points of cam are imported into CAD software to generate the solid model,and then imported into MasterCAM software to generate NC machining code. Thus high-precision machining of self-centering center rest cam mechanism could be realized economically and effectively.

关 键 词：自定心中心架 凸轮机构 非圆曲线 直线逼近 牛顿迭代法 

分 类 号：TH122[机械工程—机械设计及理论]