汽车轴承的材料及热处理长寿命技术

介绍了汽车轴承疲劳剥落失效的几种形式及其形成原因,针对各自的成因,又介绍了所采用的材料和热处理长寿命技术。     

高温长寿命发动机辅助轴承

1前言 为了满足对现代汽车发动机驱动辅助装置用轻量、低成本、高速轴承的日益增长的需求，常规的带轮轴承材料被树脂材料取代。高速运转产生大量的热量时，带轮轴承材料的变化会导致散热不良。这会使工作环境比以前更热。例如，过去最高工作温度大约为150-160℃，     

从材料及热处理浅谈轴承延寿

在分析不同工作条件下轴承零件疲劳失效机理的基础上，从材料及热处理的角度论述了国内外近年来提高可靠性，延长轴承寿命技术的发展。简单介绍了提高钢材纯净度、改善夹杂物和碳化物分布、改进钢材化学成分及采用特殊热处理等技术的开发思路及效果。     

Constructive optimisation criteria to increase bearing service life

For light mechanical structures, a bearing housing cannot be considered as rigid. Thus, rolling bearing rings are elastically deformed under loading and lose their initial cylindrical shape. The load distribution among the rolling bodies is then modified, which therefore affects the bearing life. In order to improve deficiencies in the existing models concerning the load distribution in the case of non-rigid housings, a new calculation model is proposed in the present work. This model takes into account all the constructive parameters that define the housing geometry. Using this model one can improve an existing housing shape or can optimise the design of a new one. The paper presents the results of a detailed, theoretical and experimental research project concerning the effect of the housing geometry on the bearing service life. This revised version was published online in July 2006 with corrections to the Cover Date.     

重载轴承套圈热处理工艺改进

幅高大于65mm的轴承套圈,在滚棒式热处理生产线加工时,易产生软点质量问题。通过调整不同的工艺参数,制定合理的热处理工艺,保证了该类产品的热处理质量。     

72K轴承寿命试验机改造

对72K轴承寿命试验机进行了机械、电气部分的改造,采用了触摸屏、伺服电机、直驱机械传动装置等先进技术,实现了轴向与径向自动加载,满足了用户试验要求。     

提高GCr15钢轴承套圈淬火质量的工艺措施

通过改进冷却设施和提高油的冷却强度 ,既保证淬火时工件表面淬硬和淬透层深度 ,又尽量减少淬火应力所造成的变形或开裂。提高了热处理质量。     

润滑脂的质量对轴承噪声的影响

在分析了润滑脂性能、润滑机理和噪声特性的基础上,对润滑脂的适用范围和使用要求进行了介绍,特别论证了低噪音轴承对润滑脂的要求。     

改善临界接触状态确保抱轴瓦运用可靠性

从内燃机车抱轴瓦的工作原理、工作条件出发．分析了抱轴瓦碾片、烧损的机理,提出了改善临界接触状态的技术补偿措施．以确保机车运用安全。     

渗碳钢制轴承套圈渗碳及热处理工艺

通过对某渗碳钢制轴承套圈渗碳工艺的试验研究,达到足够的有效硬化层深度、表面碳含量且渗碳层组织中无粗大网状碳化物等要求,使轴承内、外套圈的工作表面具有高的硬度、耐磨性、高抗疲劳性,而心部具有高的强韧性等性能。     

热处理工艺参数对轴承套圈变形的影响

针对超轻系列轴承套圈易变形的问题,采取改变热处理工艺参数的方法,使变形超差率大大降低。     

超轻系列轴承热处理工艺探讨

采用正交试验法研究了加热温度、保温时间、工件冷却时间、搅拌速度等四种因素对61810轴承外圈椭圆变形、硬度和组织的影响。结果表明,套圈硬度和组织均能满足技术要求,工件冷却时间对椭圆变形影响较大,搅拌速度次之。通过试验,确定了61810轴承外圈的最优热处理工艺参数。     

Behavior of perfluoropolyalkylethers under simulated dynamic bearing conditions

Perfluoropolyalkylether (PFPAE) fluids are of interest to the United States Air Force as potential high temperature liquid lubricants in gas turbine engines. PFPAE fluids have desirable thermal and oxidative stability, and favorable temperature/viscosity characteristics. However, their performance depends on the specific base fluids, additives, bearing material used as well as contact conditions and environments. Screening tests using a modified ball‐on‐rod type rolling contact fatigue (RCF) tester were conducted to study the effects of the above variables and lubricant circulation on fatigue life, wear and performance of PFPAE. Post test lubricant samples were analyzed for changes in physical and chemical properties. Traditional testing for viscosity, acid number and weight changes was performed. Fluid degradation was studied using Fourier transform infrared spectroscopy (FTIR), gas chromatography with atomic emission detector (GC‐AED) and supercritical fluid chromatography (SFC). Elemental analysis of the deposits formed at the tribocontact were determined by Auger electron spectroscopy (AES). This revised version was published online in July 2006 with corrections to the Cover Date.