An analysis of the thermal expansion of a machine tool

• Main Author: 朱佑泰
• Other Authors: 吳政憲
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/02295544897117441642

碩士 === 大葉大學 === 機械工程研究所 === 89 === High-speed machining has become more and more important in recent year. In order to achieve this goal, the high-speed spindles are used. With the increasing rotational speed, the problem of temperature rise occurs. This research uses the Taguchi method to find the optimum parameters for an oil-air lubrication spindle with ceramic bearings. The effects of the design parameters on the temperature rise and the thermal error of the spindle can also be obtained. The results can be used to minimize the temperature rise and the thermal deformation of an oil-air lubrication spindle with ceramic bearings. For the feeding system, this research applies a preload on the screw to compensate the thermal deformation. With varying feed rates and preloads, the temperature rise, the thermal deformation and the positional errors were measured. The thermal deformation and the positional errors are compared. The last part of this research focuses on the thermal errors of a planer-type machining center. The temperature rise and the thermal deformation were measured by using thermocouples and capacitance probes. Multiple-variable regression analysis was used to develop a thermal model. The model is found to greatly improve the accuracy.