摘要
高频率高精度的机床运动轴位置信息可用于精确地拟合出机床的加工轨迹,是机床动态误差监测、动态加工精度评估的基础。针对加工过程中机床运动轴位置信息高频率、高精度采集的难题,提出一种五轴联动机床运动轴位置信息高频率高精度实时采集方法。基于机床伺服系统位置环信号采集与分析获取高频原始位置信息,将高频原始位置信息转换为坐标值后进行线性误差补偿和考虑回转误差的齐次运动学变换,最终得到工件坐标系下刀位点坐标形式的高频率、高精度的机床运动轴位置信息。在一台配置西门子840Dsl系统的DMU 80P五轴数控机床上对采集方法进行验证,试验结果表明五轴同步采集频率达到1kHz;相对于机床静态定位精度,线性轴采集精度达到±2μm,旋转轴采集精度达到±0.0025°。
The high-frequency and high-precision machine tool motion axis location information can be used to fit the machining trajectory of the machine tool accurately,which is the foundation of dynamic error monitoring and dynamic machining accuracy evaluation.Aiming at the problem of acquiring high-frequency and high-precision machine tool motion axis location information,a method of high-frequency high-precision real-time acquisition for the motion axis of five-axis machine tool was put forward.This method based on gathering and analyzing the signal of the CNC servo system position loop for getting the high-frequency original position information.And then,compensate the linear errors and using homogeneous coordinates transformation which considers the rotary errors after the high-frequency original position information was transformed to coordinate values.The acquisition method was verified on a DMU 80P five-axis machine tool with Sinumerik 840Dsl system.The test indicates a conclusion that five-axis synchronous acquisition frequency reaches 1kHz,compared with the precision of the static location,linear axis acquisition precision reaches±2μm and rotary axis acquisition precision reaches±0.0025°.
作者
程英豪
李迎光
郝小忠
刘长青
张博文
CHENG Yinghao;LI Yingguang;HAO Xiaozhong;LIU Changqing;ZHANG Bowen(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《航空制造技术》
2019年第1期87-94,共8页
Aeronautical Manufacturing Technology
基金
国家级大学生创新训练计划(201710287043)
工信部智能制造专项(40205000150X)
江苏省杰出青年基金项目(BK20140036)
教师教学能力提升专项(1611JF0502Z)
关键词
五轴联动机床
高频率
高精度
位置环信号采集
刀位点坐标
加工轨迹
Five-axis machine tool
High frequency
High precision
Position loop signal acquisition
Cutter location point coordinates
Machining trajectory
作者简介
通讯作者:李迎光,教授、博士生导师,研究方向为飞机复杂零件智能数控加工,E-mail:liyingguang@nuaa.edu.cn
