The new design of the thermal elongation compensation mechanism eliminates the transient thermal error of the ram caused by the thermal deformation before the ram reached thermal equilibrium.Through test,measured machine tools after reaching heat balance of the temperature error of the spindle and the corresponding temperature field,and by using the least square method (LSM) fitting out the mathematical model between the error and temperature,the mathematical model was input in the numerical control (NC) system of machine tool for spindle steady-state thermal compensation,namely the temperature error compensation.The combination of these two kinds of thermal compensation way further enhances the machining precision of the machine tool,so as to ensure the flexible production line of computer numerical control (CNC) gantry of machining accuracy requirements of various parts.%新设计的滑枕热伸长补偿机构消除了滑枕达到热平衡之前因热变形造成的瞬态热误差.通过试验,测出机床达到热平衡后主轴的温度误差和机床对应的温度场,并利用最小二乘法拟合出该误差和温度值之间的数学模型,将数学模型输入数控系统中进行机床主轴的稳态热补偿,即温度误差补偿.这两种热补偿相结合的方式进一步提高了机床的加工精度,保证了数控龙门柔性生产线各种零件的加工精度要求.
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