数控机床高速电主轴的热态特性分析

摘要

根据高速电主轴的结构、主要传热机理和热源的生热率计算,将计算得到的结果带入ANSYS有限元分析软件,并建立电主轴有限元分析模型,进一步获得电主轴温度场信息.分析了轴承预紧力、电机转速、冷却空气流量对电主轴热态特性的影响,结果表明:预紧力的大小对主轴轴承的温升影响较小；电机转速与冷却空气流量的大小对主轴轴承的温升作用比较明显.根据研究结果提出了改善电主轴热态特性的具体措施.%According to the structure of the high speed electric spindle, the main heat transfer mechanism and the rate calculation method of heat source production, the calculation parameters were put into ANSYS finite element analysis software and the element analysis model was established in order to get electric spindle temperature field information. The influence of bearing preloaded forces, the motor speed, bearing cooling air flow rate on electric spindle hot modal were analyzed. The results show that the size of the preloaded force has little influence on the temperature rise of bearing; Motor speed and cooling air flow have apparent influence on the temperature rise of bearing. According to the results, this paper puts forward improving electric spindle heat response measures.