无温度传感器的数控机床进给轴热误差补偿  

Thermal Error Compensation without Temperature Sensors for CNC Machine Tools' Feed Drive System

作　　者：刘阔[1,2] 孙名佳[2] 吴玉亮[2] 朱铁军[2] 

机构地区：[1]吉林大学机械科学与工程学院,长春130025 [2]沈阳机床(集团)有限责任公司高档数控机床国家重点实验室,沈阳110142

出　　处：《机械工程学报》2016年第15期162-169,共8页Journal of Mechanical Engineering

基　　金：国家科技重大专项资助项目(2014ZX0416A161)

摘　　要：分析了目前常见的进给轴热误差补偿方法的缺点,如需要多个温度传感器、模型的鲁棒性较差等。提出一种基于无温度传感器的、强鲁棒性的机床进给轴热误差补偿方法,在恒温环境下实现对运动生热导致的热误差的补偿。给出了热误差模型的推导过程以及应用ISIGHT平台进行参数优化的过程。热误差模型基于摩擦生热、热传导和散热机理实时预测滚珠丝杠的温度场,以实现预测并补偿丝杠热误差的目的。在一台立式加工中心VMC850上对x、y、z轴进行了热误差测试并给出了模型的仿真效果。在另一台立式加工中心VMC850上采用激光干涉仪进行了热误差补偿前后的对比试验和加工对比试验。试验结果表明,该热补偿方法具有很高的精度稳定性和强鲁棒性。The disadvantages of the current thermal error compensation methods for CNC machine tools＇ feed drive system are analyzed,such as the requirement of many temperature sensors and poor robustness of models.A strongly robust modeling method without temperature sensors for half-closed-loop feed drive systems is proposed to realize the compensation for thermal errors induced by moving in a constant temperature environment.The thermal error modeling and parameter optimization procedure using ISIGHT are presented.Based on the heat production,heat conduction and heat convection theory,the ball-screw＇s temperature field can be obtained to predict and compensate the ball-screw＇s thermal error.Experiments are conducted on a vertical machining center VMC850,and the simulation results of the model are presented.Comparative experiments through laser interferometer test and machining are conducted on another vertical machining center VMC850.The results show that the proposed modeling method owns high accuracy stability and strong robustness.

关 键 词：立式加工中心 热误差 热补偿 鲁棒性 精度稳定性 

分 类 号：TH161[机械工程—机械制造及自动化]