隔热涂层对磨床主轴动静压轴承热变形的影响研究

为了减少热变形,提高高速精密磨床砂轮主轴系统的精度,将隔热涂层应用于深浅油腔动静压轴承.应用FLUENT和ANSYS两个有限元软件联合仿真分析了不同厚度与不同热导率的隔热涂层在不同的动静压轴承供油压力、主轴转速等因素下的轴承热-结构特性.结果表明:动静压轴承的温度和热变形以及它们的均布程度,都随着隔热涂层厚度的增大逐渐降低,随着隔热涂层热导率的减小而减小,随着轴承供油压力的增加而减小,随着轴承主轴转速的减小而减小;隔热涂层还具有均化轴承温度场和热变形分布的作用.高性能隔热涂层将明显降低轴承主轴热变形并且使其热变形均布,最终明显提高高速精密磨床砂轮主轴系统的加工精度.

Thermal Deformation Research about Applying Heat Insulation Coating on Hybrid Bearing in Spindle of Grinder

In order to reduce the thermal deformation and improve the accuracy of the grinding wheel spindle in high speed & precision grinder, the heat insulation coating was applied to the hybrid bearing with deep-shallow oil recesses. Using FLUENT and ANSYS two softwares, the thermal characteristics of the heat insulation coatings on the bearing with different thickness and different thermal conductivity were analyzed by some oil supply pressures of the bearing and the spindle speeds. The results show that temperature and thermal deformation of the hybrid bearing and their uniform distribution are gradually decreased with the increase of the thickness of the heat insulating coating and with the decrease of the thermal insulation coating''s thermal conductivity and with the increase of the oil supply pressure and with the decrease of the spindle speed; Heat insulation coating can be the average bearing temperature distribution. High performance heat insulation coating will greatly reduce the thermal deformation of the bearing spindle and improve the accuracy of the spindle, the machining precision of the grinding machine with the spindle will be improved.