An improved thermal model for machine tool bearings
- 作者：Xu MinJiang ShuyunCai Ying
- 会议时间：2010-07-17
- 关键词：Machine tool spindle ; Thermal characteristics ; Rolling bearing ; Joint ; Heat generation power
- 作者单位：Xu Min,Jiang Shuyun(Department of Mechanical Engineering,Southeast University,Nanjing,210096,P.R.China)Cai Ying(Wuxi Machine Tool Corporation,Wuxi,214061,P.R.China)
- 母体文献：国家自然科学基金委员会高性能机床主轴中的关键科学问题”十二五“规划研讨会论文集
- 会议名称：国家自然科学基金委员会高性能机床主轴中的关键科学问题”十二五“规划研讨会
- 会议地点：长沙
- 主办单位：国家自然科学基金委员会
- 语种：chi
摘要
Thermal model for machine tool spindle is of great importance to machine tool design.Traditionally, the thermal contact resistance between solid joints and the change of the heat generation power with the bearing temperature are often ignored when thermal characteristics of a machine tool spindle are analyzed.This has caused inaccuracies in the thermal model.With the heat source models and the heat transfer models from Bossmanns and Tu [Journal of Manufacturing Science and Engineering 123 (2001) 495-501, International Journal of Machine Tools & Manufacture 39 (1995) 1345-1366], a model including the thermal contact resistance at solid joints based on a fractal model and the change of the heat generation power, viz.the amount of the heat generation per second, with the bearing temperature increases is developed.The complete thermal model is used to simulate the temperature distribution in grinding machine housing with a conventional spindle bearing.Compared with experiment, it is shown that the completed model is much more accurate than the traditional model which ignores the two important factors above.The thermal expansion of the housing system is analyzed.