In order to analyze the temperature field distribution of 170SD30 motorized spindle,and to provide theoretical basis for improving the accuracy of spindle machining,the mathematical model and a quarter of the motorized spindle three-dimensional geometric model were established to verify the reliability of the model by experiments.Simulate the temperature distribution of motorized spindle by using COMSOL software,study the influence of spindle speed and radial grinding force on the temperature rise of motorized spindle.Simulation results show that the highest temperature field appears on the rear bearing and the temperature is 47.4 ℃,and the lowest temperature field appears on the channel is 16.2 ℃.The temperature of air between rotor and stator decreases gradually.When the flow reaches 0.35 m3/h,the average range of temperature between experiment and simulation result on bearing of the motorized spindle external surface is 0.25 ℃,the error of 1.3 ％.Bearing and rotor are in high temperature area.On account of the largest heating rate on bearing,meanwhile the structure of the rear bearing is not conducive to heat dissipation,the maximum temperature exists on the rear bearing.The temperature between the rotating shaft and the casing gradually decreases,and the temperature of the rotor to the stator decreases fleetly due to the low heat transfer coefficient of the stator and rotor clearance.The revolving speed has the greatest influence on the rear bearing and the grinding force has the greatest influence on the front bearing.%目的 分析170SD30电主轴温度场分布情况,为提高主轴加工精度提供理论依据.方法 建立电主轴数学模型及1/4三维几何模型,实验验证电主轴模型的可靠性.利用COMSOL软件模拟电主轴的温度分布,研究主轴转速、径向磨削力对电主轴温升的影响.结果 电主轴的最高温度出现在后轴承处,温度为47.7℃;电主轴最低温度出现在冷却水水道处,温度为16.2℃;转子到定子间的空气温度迅速递减;在冷却液流量达到0.35 m3/h时,对比电主轴后轴承外表面处温度的实验数据与模拟数据,平均温差为0.25℃,误差为1.3％.结论 轴承和转子处于高温区,由于轴承发热率大,而后轴承所处位置的结构不利于散热,导致后轴承温度最高;由于定、转子间隙的传热系数低,致使转子到定子的温度急剧降低;转速对后轴承温升影响最大,而磨削力对前轴承温升影响最大.
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