高速电主轴轴承的油气润滑及其应用

油气润滑是轴承润滑的理想方式，在高速电主轴行业，油气润滑技术以其众多的优点成为高速主轴轴承润滑方式的首选。本文以高速电主轴的实际应用阐述油气润滑的优越性及其如何合理应用。     

油气润滑技术在高速电主轴轴承上的应用

随着润滑技术的发展,油气润滑技术正逐步应用于高速电主轴轴承的润滑.在分析油气润滑工作原理的基础上,讨论了油气润滑技术在高速电主轴轴承上的应用及其特点.实践表明,相对脂润滑、油雾润滑而言,油气润滑更适应于高速主轴轴承的润滑要求.     

YQA－5油气润滑器

油气润滑是一种新的润滑技术，它具有比油雾润滑更好的润滑效果和更高的可靠性而得到迅速发展。介绍了ＹＱＡ－５油气润滑器及应用于高速主轴轴承的润滑效果，并与油雾润滑效果以及进口同类产品的润滑效果进行了比较。     

高速电主轴轴承油气润滑系统的研究

高速电主轴轴承高速旋转时，轴承内部将产生大量摩擦热，从而影响轴承刚度性能及高速性能，轴承润滑可以减少热量的产生，降低温升。油气润滑系统相对于其它润滑系统更适应于高速主轴轴承的润滑要求。对油气润滑的工作原理及其优越性等方面进行了分析。     

高速轴承油气润滑系统的研究及应用现状

随着高速加工技术的快速发展,油气润滑技术应用于高速机床/磨床电主轴轴承已成为目前发展的普遍趋势。概述近年来油气润滑系统应用于高速轴承的研究现状及应用进展,总结油气润滑系统组成、主要影响因素、油气两相流形成机制、润滑状态、关键部件研制等油气润滑系统的研究成果和应用现状,阐述油气润滑系统的设计难点,并提出油气润滑系统研究的未来发展方向。     

超高速机床主轴轴承润滑的合理选择

近年来，机床主轴在不断的向高速化方向发展，而主轴轴承的润滑对实现主轴的高速化具有重要作用。本文从润滑剂、润滑方式的选择，润滑剂用量的控制等方面讨论了越高速主轴单元轴承的润滑问题，为超高速轴承的润滑设计提供了一些理论依据。     

高速主轴轴承预紧力技术研究

高性能电主轴单元集合了精密主轴轴承技术、高速电机驱动与控制技术、油气润滑与冷却技术、高速主轴轴承预紧等相关技术,其中高速主轴轴承预紧技术是实现高性能电主轴的关键技术之一.论文着重阐述了高速主轴轴承预紧力研究的目的和意义、轴承预紧力的研究现状以及本实验室对轴承施加预紧力的研究.     

氮化硅陶瓷滚子轴承的加速寿命试验和断油润滑试验

本文介绍了一次组合陶瓷轴承的加速寿命试验和断油润滑试验,试验轴承是用于某航空发动机主轴前支承的短圆柱滚子轴承,滚动体由氮化硅陶瓷材料制成,套圈和保持架仍采用原钢轴承的套和保持架,试验设备为航空轴承专用试验台,试验表明,试验陶瓷轴承在高速条件下工作寿命和短期油润滑能力均好于同型号钢轴承。     

超高速主轴轴承内部润滑状态分析

基于稳态Ree-Eyring模型点接触热弹流润滑理论,采用多重网格法分析了油气润滑超高速主轴轴承在不同结构参数和工况条件下内部各接触区域的润滑状态;通过对轴承内部球与内、外套圈滚道之间的润滑状态进行系统仿真,分析了轴承转速、轴向预载荷、球径和初始接触角等基本参数对超高速主轴轴承内部润滑状态的影响。结果表明:超高速运行状态下的主轴轴承,其内部接触区的润滑油膜温度急剧升高,制约着电主轴轴承极限转速的提高;优化轴承的球径和初始接触角可使轴承内部接触区达到最佳的润滑状态;轴承的轴向预载荷对内部接触区的润滑状态影响不大。     

高速电主轴油气润滑参数优化系统及平台设计

油气润滑是高速电主轴最高效的冷却润滑方式,然而要达到最佳的润滑效果必须针对不同型号轴承以及不同工况设定准确的油气润滑参数,这就需要可靠的试验装备进行大量的试验分析。为此搭建模拟电主轴运行工况的实验平台,设计油气润滑系统并设计一种兼具油气混合器和油气分配器功能的油气混合分配器。试验结果表明：试验平台最佳的转速范围为0～30 000 r/min,满足高速机床主轴试验的转速要求;油气混合分配器供油误差满足±10%的行业标准,使用寿命达到12万次。因此搭建的试验平台和油气润滑系统对高速电主轴油气润滑参数的试验研究有较高的可靠性。     

Comparison Between Oil-Mist and Oil-Jet Lubrication of High-Speed,Small-Bore,Angular-Contact Ball Bearings

Parametric tests were conducted with an optimized 35-mm-bore-angular-contact ball bearing on a high-speed, high-temperature bearing tester. Results from both air-oil mist lubrication and oil-jet lubrication systems used to lubricate the bearing were compared to speeds of 2.5¥10⁶ DN. The maximum obtainable speed with air-oil mist lubrication is 2.5¥10⁶ DN. Lower bearing temperatures and higher power losses are obtained with oil-jet lubrication than with air-oil mist lubrication. Bearing power loss is a direct function of oil flow to the bearing and independent of oil delivery system. For a given oil-flow rate, bearing temperature and power loss increase with increases in speed. Bearing life is an inverse function of temperature, the difference in temperature between the individual bearing ring components, and the resultant elastohydrodynamic (EHD) film thicknesses. Bearing life is independent of the oil delivery system except as it affects temperature. Cage slip increased with increases in speed. Cage slip as high as 7 percent was measured and was generally higher with air-oil mist lubrication than with oil-jet lubrication.     

油气润滑滚动轴承试验装置的研制

根据油气润滑技术的特点,研制了一台可以用于油气润滑滚动轴承的试验装置。该装置具有对加载、转速、油气润滑的供油量、供气量、进气位置等参数的调整功能,能对滚动轴承外圈温度变化过程进行测试。通过一组具体的试验,证明该试验装置达到了预期的功能要求。与传统的连续供油润滑方式相比,采用油气润滑方式,可以使滚动轴承的温升速度大大降低,表明油气润滑与传统润滑方式相比的确具有十分显著的优越性。     

高速电主轴的油气润滑

在高转速轴承寿命试验机电主轴中选用了油气润滑方式,实施稳定的微量油润滑.通过实验确认,DMN达150mm.r/min,解决了油雾润滑污染环境的问题,使环境质量良好。     

A parametric study on oil/air lubrication of a high-speed spindle

The ball-bearing is widely used on many high-speed spindles due to its low starting friction and high load capacity. However, heat generation and dynamic loading caused by high-speed rotation have been obstacles for increasing the speed limit in many high-speed ball-bearing applications. Applying an appropriate lubrication and preload cannot be overemphasized. Recently, oil/air lubrication has been used on high-speed spindles because of its accuracy in oil quantity control and high cooling efficiency. However, an oil/air supply with inadequate parameters is undesirable. In this study, the performance of a high-speed spindle under different lubrication parameters and preloads was investigated. The Taguchi method was applied to study the effects of design parameters on the lubrication efficiency. This method can also be used to obtain the optimum lubrication conditions. The optimum operating conditions that create the smallest temperature increase were established. The effects of preload on the temperature increase, the thermal deformation and the static stiffness of an oil/air lubricated spindle were studied. The results provide a useful tool in designing a high-speed spindle with a small increase in temperature and sufficient static stiffness.     

高速铣床电主轴的润滑与冷却

介绍了高速铣床电主轴系统的结构，并着重对它们的润滑方式：脂润滑、油雾润滑和油气润滑的各自优、缺点以及高速电主轴冷却的方式和特性加以深入阐述和分析。     

通心密封短接在油泵出口密封上的应用及其润滑的综合分析

本文通过的对供油泵出口机械密封改用通心密封短接后,密封效果良好:同时,圆柱滚子轴承在4.8MPa的压力下,用250号燃料油润滑,达到弹流润滑。     

Grease lubrication of the high-speed ball bearing for small turbomachines

The feasibility of the operation of a mainshaft ball bearing with grease lubrication at high speed has been demonstrated by rig tests. Angular contact ball bearings of 8 mm bore were used under the 137 N axial load. In order to achieve a good reliability of the grease lubrication at very high speed, the bearings have been subjected to a variety of hostile tests, including the snap accelerations from 0 to 100000 rpm within 10 seconds, extended operation at high axial loading, operation at high speed, and operation exposed to hot air at turbine inlet. From extensive experiments, it was found that the bearings could be operated up to the speed of 0.87 million DN with grease lubrication, and a low-cost grease lubrication system was developed for an expendable small turbomachine.     

高速电主轴系统热变形分析及抑制措施

从加工中心电主轴的结构和热源两方面对电主轴热变形原因进行了分析,提出了降低电主轴温升的技术方案,主要采取了减小轴承发热量、减小电动机发热量、主轴轴承循环冷却及油气润滑系统等措施,通过基于比利时Lemmens多通道动态监测仪和高精度pt100温度传感器的试验验证,高速加工中心电主轴的温升得到了有效控制,其机械性能、可靠性也得到了保障,对加工中心高速电主轴的应用及发挥其潜能具有非凡的现实意义。     

气液两相流对发动机主轴承润滑性能影响的分析

润滑油中出现的气液两相流现象是发动机主轴承工作中较常出现的现象,对发动机工作性能有较大影响。本文基于主轴承中润滑油气液两相均匀流动模型,利用湍流理论和有限差分技术,通过求解Navier-Stokes方程,获得了润滑油含气率、转子转速以及润滑油入口速度和轴承腔润滑油出口压力和速度的关系。本文的工作对于发动机主轴承润滑设计具有一定的参考价值。