摘要
以某厂一台数控双主轴车床为研究对象，根据齐次坐标转换原理，给出了该机床的几何误差和热误差的综合数学模型．对于不同的热误差因子，给出了不同的热误差数学模型，通过计算机分析合成误差曲线的斜率，分离了热误差和几何误差．补偿系统主要由微机结合机床控制器构成．由机床的温度信号和工作台运动位置信号结合综合误差数学模型，通过微机算出补偿值并送入机床控制器对刀架进行附加进给运动完成实时补偿．补偿试验表明，工件之间的尺寸变化可从原来的６０μｍ以上降到１４μｍ；工件的锥度变化从５０μｍ／ｃｍ以上降到１５μｍ／ｃｍ，大幅度提高了机床的加工精度，满足了工厂的实际生产需要．
A real time error compensation system has been developed to improve the geometric thermal accuracy of a NC twin spindle lathe by using sensing, metrology, modeling, and computer control techniques. The synthesis error models are proposed to combine in a single expression both the geometric and thermal errors of the machine by a homogeneous coordinate transformation method. Different types of models are proposed for different kinds of the thermal error components. Separation of the geometric and thermal errors if done by estimating variation of the slopes of the error profiles. The compensation cutting tests show that the size variations of the workpieces could be reduced from 60 μm to 14 μm, and the taper from 50 μm/cm to 15 μm/cm.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1998年第5期28-33,共6页
Journal of Shanghai Jiaotong University
关键词
数控机床
数学模型
几何误差
热误差
实时补偿
numerically controlled machine
mathematical model
machining accuracy
geometric and thermal error
real time compensation
