基于跳度约束的连续短线段高速加工运动学平滑算法  

Kinematic smoothing algorithm for high speed machining of continuous short-segments based on jounce constraint

作　　者：杜金锋[1] 张立强[1] 高甜[1] DU Jinfeng;ZHANG Liqiang;GAO Tian(College of Mechanical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械工程学院,上海201620

出　　处：《计算机集成制造系统》2018年第9期2246-2253,共8页Computer Integrated Manufacturing Systems

基　　金：国家自然科学基金资助项目(51775328)~~

摘　　要：针对连续短线段刀具路径加工过程中,机床进给轴速度和加速度突变引起刀具振动,影响加工质量等问题,提出适用于高速、高精数控机床的新型运动学平滑算法。对连续短线段刀具路径,利用跳度约束加速度曲线,对其附加速度、加速度、位移边界条件,并结合最大轮廓误差和驱动器的运动学限制,推导出拐角处的最佳转接速度和短线段路径的最大进给速度,实现进给轴速度和加速度平滑转接。通过实验对比直线型加减速算法验证分析表明,在加工具有29个拐角的连续短线段刀具路径时,加工时间减少了11%,刀具路径达到G3连续,速度曲线达到G2连续,加速度曲线达到G1连续,有效减少了刀具振动,提高了加工质量。In the processing of continuous short-segments tool path,the changes of machine drive shaft speed and acceleration would lead to tool vibration and affect processing quality.For these problems,a new kinematic smoothing algorithm for high speed and high precision CNC machine tools was proposed.For the continuous short-segments tool path,its boundary conditions included velocity,acceleration and displacement were attached by constraining the acceleration curve with jounce.The optimal speed of corner and the maximum speed of short-segment were deduced through combining with the maximum contour error and the kinematic limit of the driver,which achieved smooth speed and acceleration of feed axis.Through the comparative test analysis of linear acceleration/deceleration algorithm,when the continuous short-segments tool path with 29 corners had been processed,the machining time reduced by 11%,the tool path reached G 3 continuity,the velocity curve reached G 2 continuity and the acceleration curve reached G 1 continuity.The tool vibration was reduced effectively and the processing quality was improved.

关 键 词：高速加工 短线段 运动学 跳度 平滑算法 数控系统 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]