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

本文介绍了利用机床热变形的基本特性进行热变形校正的方法。MC的热变形不仅是由内部热源如轴承、电机、滚珠丝杠等引起的，而且是由外部热源引起的，如机械车间的室温变化、车间墙壁的热辐射和其他机器。一般来说，当热源附近测量的单位温度、主轴电机处的单位有效功率和单位室温按脉冲或逐级产生时，可以通过实验得到基本的热变形。当测量机床结构的温度和主轴电机处的有效功率和室温时，可以得到基本特性，然后似乎可以利用基本特性和热源附近测量的温度，电机处和室温处的有效功率来估计热变形。因此，本文研究了基于室温恒定和室温变化以及MC周围上下温差的MC热变形估算方法。根据研究结果，得到以下结论：在室温恒定的情况下，利用机床结构的基本特性和温度或主轴电机的有效功率可获得热变形。在室温变化的情况下，可以通过将MC的热变形从室温变化引起的热变形与除室温变化外的热源引起的热变形之间进行潜水来估计热变形。

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.