高速角接觸球軸承油氣潤滑二相流溫升數(shù)值分析
[Abstract]:High-speed motorized spindle is the core functional part of high-speed machining machine tool. Angular contact ball bearing is the main supporting mode of high-speed motorized spindle. The friction heat of angular contact ball bearings in high speed operation is the main factor leading to premature failure, so good lubrication and cooling is very important to ensure the normal operation of bearings. As a new type of gas-liquid two-phase flow cooling and lubrication technology, oil-gas lubrication has become the first choice for high-speed bearing lubrication and cooling due to its excellent performance and clean and environmental characteristics. In view of this, the temperature rise of oil-gas lubricated two-phase flow in angular contact ball bearing is analyzed. Based on the theory of bearing heat generation, the heat generation mechanism of angular contact ball bearing under the condition of oil and gas lubrication is analyzed, and the heat generation rate and convection heat transfer coefficient of the bearing under different conditions are calculated. The geometric model of 7006C angular contact ball bearing cavity is established, and the temperature field is numerically analyzed by using Fluent from six aspects of rotational speed, oil supply, gas supply pressure, lubricating oil viscosity, inlet position and inlet number. The results show that: (1) the high temperature region in the bearing cavity is mainly distributed in the area where the rolling body is in contact with the raceway, which is caused by the friction heat in the contact area and the stirring heat of lubricating oil, and the temperature in the oil and gas inlet region of the bearing cavity is relatively lowest. (2) with the increase of rotational speed, the temperature in the bearing chamber increased significantly, and the temperature increased more and more, and with the increase of the oil supply, the temperature in the bearing chamber first decreased and then increased. There is an optimal amount of oil supply. (3) compressed air is not only the transfer of oil in oil and gas lubrication, but also cooling and heat dissipation. In a certain range, with the increase of gas supply pressure, the temperature in the bearing chamber decreases obviously, and the cooling effect is obvious; with the increase of the viscosity of lubricating oil, the temperature of the bearing chamber decreases first and then increases. The optimum viscosity of lubricating oil exists. (4) with the increase of inlet number, the temperature distribution in the bearing chamber changes obviously. In the case of a certain amount of gas supply, the bearing chamber with two entrances is the best temperature condition. At the same time, it is noticed that the temperature in the bearing chamber is relatively uniform and the high temperature region is reduced when the inlet is increased. Therefore, increasing the number of imports while properly increasing the amount of gas supply can achieve better results. By comparing with the experimental data, the numerical analysis results are basically consistent with the experimental results. The research results provide an effective method and reference for the design of oil and gas lubrication system of angular contact ball bearing and the determination of optimum lubrication parameters.
【學(xué)位授予單位】:蘭州理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TG502.3
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