一种双面凸轮的反求设计方法

Study on the Reverse Engineering of a Double-face Cam

提出一种双面凸轮的反求设计和误差控制方法。从动件类加速度对轮廓曲线误差敏感,通过修正从动件类加速度曲线,以间接提高凸轮廓线精度。通过数字化测量,获得凸轮双面轮廓的点云数据,对点云数据进行精简并进行重构、装配对齐,获得凸轮轮廓实体模型。对获得的凸轮轮廓数据二次求导并拟合,获得从动件类加速度曲线和类加速度误差值。基于类加速度误差与从动件位移误差的关系函数,对轮廓线进行修正,从而消除反求误差。

A reverse design and error correction method for double-face cam is presented. Due to the fact that the type-acceleration of cam follower is sensitive to the cam profile curve error,the cam profile accuracy is improved through correcting the type-acceleration curve. Before the cam profile solid model is generated,the data cloud obtained from the digital measurement of the cam double-face profiles are simplified,reconstructed and justified.Based on the function of the acceleration error and the displacement error of the cam,the profile curve is improved by correcting the fitting error of the type-acceleration curve,which is the second derivative of the profile curve.