高速精密角接触球轴承油气两相流动润滑分析

发布时间：2018-04-01 17:23

本文选题：油气两相流　切入点：水平管　出处：《吉林大学》2016年硕士论文

【摘要】：随着机床主轴转速的不断提高,高速精密轴承的润滑冷却问题逐渐成为了限制主轴转速提高的关键因素。而目前多采用的脂润滑以及油雾润滑,由于其自身条件的限制,已和越来越高的主轴转速显得有所失衡,急需改进现有润滑冷却技术,目前推荐的高速轴承润滑冷却技术主要是油气两相环状流润滑。因此,本文基于本课题组与国内某轴承厂商的校企合作项目,参照油气两相环状流润滑原理,对于水平管路和轴承腔流体域进行了润滑冷却研究。主要进行了以下工作:1.为了研究油气两相流在水平管路内的形成机理和扩展,本文建立了油气输送管路的水平管道模型,通过流体仿真软件FLUENT中的RNG k-?模型和VOF模型,针对不同进油量进行了仿真分析。供气速度恒定为30m/s的情况下,形成稳定油气两相环状流的最佳供油速度大约为1m/s。2.为了研究轴承腔流体域的流场分布,本文建立了7014角接触球轴承的轴承流体域模型,采用流体仿真软件FLUENT,应用RNG k-?模型、VOF模型以及滑移网格模型,在相同润滑参数,不同主轴转速以及相同主轴转速,不同润滑参数条件下,从入口的速度分析、腔内油液分布、流迹线图、液相体积分数对比、温度对比以及压力对比等方面分析了轴承腔内的流场。结果表明,从腔内润滑油液体积分数分布来说,分布量较少,从润滑区、已润滑区、待润滑区依次降低,但是分布范围大,几乎覆盖了腔内所有区域;轴承腔内温度受主轴转速的影响很大,主轴转速越高,腔内最高温度和平均温度也越高。
[Abstract]:With the increasing of spindle speed of machine tool, the lubrication and cooling of high speed precision bearing has gradually become the key factor to limit the increase of spindle speed.However, the grease lubrication and oil mist lubrication, which are widely used at present, have been out of balance with the increasing spindle speed due to the limitation of their own conditions, so it is urgent to improve the existing lubricating and cooling technology.At present, the recommended high-speed bearing lubrication cooling technology is oil-gas two-phase annular flow lubrication.Therefore, based on the school-enterprise cooperation project between our group and a domestic bearing manufacturer, the lubrication and cooling of horizontal pipeline and bearing cavity fluid domain are studied according to the lubrication principle of oil-gas two-phase annular flow.Mainly carried out the following work: 1.In order to study the formation mechanism and expansion of oil-gas two-phase flow in horizontal pipeline, the horizontal pipeline model of oil and gas pipeline is established in this paper, and the RNG k-?The model and VOF model are simulated and analyzed for different oil intake.When the gas supply rate is constant to 30m/s, the optimal oil supply rate for the formation of stable two-phase annular flow is about 1 m / s. 2.In order to study the fluid field distribution in the bearing chamber, the fluid domain model of 7014 angular contact ball bearing is established in this paper. The fluid simulation software fluent and RNG k-?VOF model and slip mesh model, under the same lubrication parameters, different spindle speed, same spindle speed, different lubrication parameters, from the inlet velocity analysis, oil distribution in the cavity, flow trace diagram, liquid volume fraction comparison,The flow field in the bearing cavity is analyzed in terms of temperature comparison and pressure comparison.The results show that the distribution of lubricating oil liquid number in the cavity is less than that in the lubricating zone, but the distribution range is large and almost covers all the areas in the cavity, while the lubricated area, the lubricated area and the unlubricated area decrease in turn.The higher the spindle speed, the higher the maximum temperature and the average temperature.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG502.3;O359

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