重型数控机床热学模型及热误差补偿技术研究

摘要

研究了重型数控机床主轴系统温度场及主轴热变形误差,分别测试了机床不同工况下的温升情况及主轴三个方向上的热变形.基于测试数据获取了机床主轴热变形的变化规律,并建立起了机床的热误差建模预测模型,针对西门子840D系统的补偿模块,应用预测模型实现对热误差的补偿并进行了实验验证.%This paper studies the temperature field of the spindle system and the thermal deformation error of the spindle of the heavy CNC machines.The temperature rising and the thermal deformation of the spindle in three directions were firstly tested under different conditions.Then,the thermal error prediction model was established based on the data characterizing the variation law of the tool spindle thermal deformation.An experiment,aiming at the Siemens 840D system compensation model,was conducted to verify the compensation of thermal error by using the prediction model.