摘要
以往提高CNC系统加工精度的方法主要是采用新的伺服控制系统和改进插补算法,但始终存在因为伺服系统固有的跟随误差带来的对轮廓误差的影响,在高速切削中,这种影响尤为突出。笔者提出一种全新的插补算法,利用实际位置反馈信号来实时进行插补运算,采用矢量的方法给出插补信号,同时为了消除减速过程中因实际减速点和理论减速点不重合造成的长时间低速运行现象,提出了一种全新的速度自适应跳变的方法。仿真结果表明:该方法有效降低了跟随误差对加工误差带来的影响,使轮廓误差降低了一个数量级,同时消除了长时间的低速运行状态,并使减速终点刚好落在目标点上。
The traditional method to improve the machining precision of the CNC system is to adopt new servo control systems and to improve interpolation algorithm. However, it always causes following error and contouring error. Errors are particularly outstanding in high speed cutting. A new interpolation algorithm is proposed in this paper by executing the real-time interpolation based on the real-position feedback and outputing the interpolation data with a vector method. For eliminating the low-speed running stage caused by misalignment of practical deceleration-point and theoretic deceleration-point, a new method of adaptive speed jump is presented. The simulation shows that this method can decrease the influence of the following error on the machining error and eliminate the low-speed running stage, and that the end point of deceleration process falls on the target point exactly and the contouring error is decreased one order of magnitude.
出处
《机械科学与技术》
CSCD
北大核心
2009年第8期1035-1039,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
江苏省自然科学基金项目(BK2003005)资助
关键词
跟随误差
轮廓误差
位置反馈
矢量法
速度自适应跳变
following error
contouring error
position feedback
vector method
adaptive speed jump
