Method of Correction for Thermal Deformation of Machine Tool Using Its Basic Characteristics

本文介绍了利用机床的基本特性进行热变形修正的方法。MC的热变形不仅是由轴承、电机、滚珠丝杠等内部热源引起的，也是由机械加工车间的室温变化、车间墙壁和其他机器的热辐射等外部热源引起的。一般来说，当在热源附近测得的单位温度、主轴电机处的单位有效功率和单位室温以脉冲或步进方式产生时，基本热变形可以通过实验获得。当测量机器结构的温度、主轴电机处的有效功率和室温时，可以获得基本特性。然后利用基本特性和热源附近的温度、电机有效功率和室温来消除热变形。因此，本文研究了在室温恒定、室温变化以及MC周围上下温差的情况下估算MC热变形的方法，得到了以下结论.在室温恒定的情况下，热变形可以利用机床结构的基本特性和温度或主轴电机的有效功率来求出.在室温变化的情况下，可以通过将MC的热变形分为由室温变化引起的热变形和由除室温变化之外的热源引起的热变形来估计热变形。

This study describes approaches available for a method of correction for thermal deformation of machine tool using its basic characteristics. The thermal deformation of MC is caused not only by inner heat sources such as bearings, motors, ball screws and so on, but also by outer heat sources, such as room temperature variation in a machine shop, thermal radiation from the wall of the shop and other machines. In general when a unit temperature measured near heat source and a unit effective power at the spindle motor and a unit room temperature are generated pulsewise or stepwise, the basic thermal deoformation can be obtained experimentally.When the temperature of the machine structure and the efffective power at the spindle motor and the room temperature are measured, the basic characteristics can be obtained, and then it seems that the thernmal deformation can be etimated by using the basic characteristics and the temperature measured near the heat source, the effective power at the motor and the room temperature. Therefore, the method for estimating the thermal deformation of MC with room temperature constancy and room temeperature variation and difference of temperature between upper and lower around MC is researched in this study.As the results, the following conclusions have been obtained.1. In case of room temperature constancy, the thermal deformation can be obtained by using the basic characteristics and the temperature of the machine structure or the effective power at the spindle motor.2. In case of room temperature variation, it is possible to estimate the thermal deformation by diving thermal deformation of MC between thermal deformation caused by room temperature variation and thermal deformation caused by heat source except room temperature variation.