基于改进圆弧转接的直线段连续过渡算法  

Continuous transition algorithm of line segments based on improved circle transition

作　　者：肖建新 张辉[2,3] 李炳燃[2] 李国林 XIAO Jianxin;ZHANG Hui;LI Bingran;LI Guolin(Department of Electronic Engineering,Tsinghua University,Beijing 100084,China;Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipment and Control,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学电子工程系,北京100084 [2]清华大学机械工程系,北京100084 [3]清华大学精密超精密制造装备与控制北京市重点实验室,北京100084

出　　处：《计算机集成制造系统》2019年第9期2248-2255,共8页Computer Integrated Manufacturing Systems

基　　金：国家科技支撑计划资助项目（2015BAIO1B16）~~

摘　　要：复杂曲面是数控加工中的一种类型,在数控系统加工前,商业软件会将复杂曲面离散成海量直线段逼近,但相邻直线段间速度的不连续性严重影响曲面加工质量,因此常采用轨迹段间插入直线或曲线来改善速度的连续性。基于已有轨迹段间插入圆弧的转接算法,提出一种基于公差的改进圆弧过渡路径规划算法,在保证转接轨迹精度的同时提高了转接速度。进一步,采用一种加速度连续、加加速度有界的7段S形加减速曲线,实现了刀具路径速度规划及插补。基于上述算法进行了曲线加工验证实验,实验结果表明,所提算法能够在达到同等加工精度条件下,显著提升轨迹段间的转接速度(的连续性),提高复杂曲面加工效率。The complex surface is a type of CNC machining.Before the CNC system is processed,the commercial software will discretize the complex surface into a mass of straight line segments.However,the discontinuity of speed between adjacent straight line segments seriously affects the quality of the curved surface processing,It is often used to insert straight lines or curves between the track segments to improve the continuity of the speed.Based on the algorithm of inserting circular arcs between track segments,a tolerances-based improved circular arc path planning algorithm was proposed,which improved the switching speed while ensuring the precision of transit path.Further,a seven-section S-shaped acceleration/deceleration curve with continuous acceleration and jerk bounded was used to realize tool path speed planning and interpolation.The curve processing verification experiment was carried out based on the above algorithm.The experimental results showed that the proposed algorithm could significantly improve the transition speed between track segments and the processing efficiency of complex curved surface under the same machining accuracy.

关 键 词：局部转接 圆弧曲线 路径规划 速度规划 复杂曲面 数控加工 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TH166[自动化与计算机技术—计算机科学与技术]