圆锥滚子轴承因使用不当造成的失效现象分析

圆锥滚子轴承通常由外圈、内圈、滚子和保持架组成，其中，内圈、滚子和保持架装配铆合后形成内组件，而外圈则是可分离的。轴承转动时，滚子与内外套圈滚道都受到很大的交变接触应力，其工作表面易产生金属疲劳现象。实践证明，有适当的润滑和密封、安装和维护条件正常时，绝大多数轴承能达到预期寿命，其失效形式为承受交变应力作用而发生的接触疲劳失效。但在轴承安装、使用和维护过程中如发生不正确的操作，或与轴承相关的工件表面几何形状超差，     

圆锥滚子轴承失效分析

通过对某圆锥滚子轴承的失效分析,找出两公司圆锥滚子轴承在材料及制造方面存在的差异,指出轴承早期疲劳失效的原因,提出相应的改进建议,以提高圆锥滚子轴承使用寿命及可靠性。     

圆锥滚子轴承早期失效个案分析

由某公司生产的30307轴承,在考核其寿命时,试验至174 h时轴承损坏.现对其失效的原因进行分析. 1 表面缺陷形貌观察 拆套后发现外圈、保持架均完好无损坏,而滚子靠近小头处的工作表面沿圆周方向有不同程度的剥落(图1),同时内圈滚道靠近小端面油沟处沿圆周方向存在一条磨印(图2).     

圆锥滚子轴承的失效形式

通过对圆锥滚子轴承进行失效分析,较详细地介绍了接触疲劳、磨损、断裂、塑性变形、锈蚀及电流腐蚀等失效形式,并指出了各种失效的基本特征及其形成的原因,为采取相应的防范措施提供了重要参考。     

四列圆锥滚子轴承的使用分析

针对四列圆锥滚子轴承在实际使用中的早期失效,提出滚动轴承的润滑防护、定期改变轴承的承载区等方法。     

渗碳钢制圆锥滚子轴承外圈开裂失效分析

G20CrNi2Mo渗碳钢制圆锥滚子轴承外圈,征使用过程中出现开裂现象。由于该轴承产量高,使州部何炎键,为避免再出现旧样的开裂现象,必须找出其产牛开裂的原因。     

四列圆锥滚子轴承的修复

针对某四列圆锥滚子轴承双外圈滚道上存在的若干凹坑及多条灰褐色痕迹的情况,分析了原因并研究提出了修复方案.     

外圈带凸缘的圆锥滚子轴承成套宽度的控制

针对原磨装工艺无法保证外圈带凸缘的圆锥滚子轴承的整套宽度,根据磨装加工的尺寸链,对其进行了分析,并调整了影响成套宽度的各个尺寸公差,保证了轴承的成套宽度,实现了该产品大批量生产和完全互换装配.     

圆锥滚子轴承车削工艺的改进

1 问题的提出 以31318圆锥滚子轴承内圈外表面车加工工序为例,如图1所示.传统的车加工工艺为:由液压仿形车床一次装卡,上刀架纵向走刀车削外表面中的内外径和内滚道,下刀架成形刀车削小内外径和弯头刀向上走刀车削大端面,一次加工完成.     

四列圆锥滚子轴承的选用及维护

介绍轧机工作辊用四列圆锥滚子轴承的选用要点及使用维护方法,以期提高其使用寿命。     

Prediction of Roller Skewing in Tapered Roller Bearings

The paper proposes a comprehensive model to predict the skew movement of a roller in tapered roller bearings. Numerical solutions are given on a LM48548/LM48510 bearing. The effect of the shaft speed, ring misalignment, and lubricant temperature on the roller skew angle is presented and compared to the experimental data available in the literature. The results indicate that the skew angle depends first on the misalignment angle between the cup and the cone. The roller skew is also greatly influenced by the traction at the roller-flange contact, the skew angle increasing with the traction at this contact, and by the geometry of the roller end.     

圆锥滚子超精导辊的设计

为了超精出带修正线的全凸或半凸滚子 ,需采用专门设计的超精导辊。介绍了一种计算简便的圆锥滚子超精导辊的设计方法 ,并用实例说明。     

双列圆锥滚子轴承拟动力学分析

为得到较准确的高速动车轴箱轴承动态性能,考虑了轴承内部摩擦,润滑剂以及保持架等因素,利用Python语言求解所建立的双列圆锥滚子轴承(5+3n)自由度拟动力学模型,得到轴承各滚动单元角速度和内外圈接触面相对滑动速度的分布,对不同游隙下滚子打滑率和内外圈PV值动态性能进行了研究。结果表明:随着轴承负游隙的增大,滚动体与内圈接触载荷增大,滚子打滑率逐渐降低;滚动体与内圈相对滑动速度较大,PV值明显大于外圈;与内圈相比,滚动体与外圈接触处产生的热量明显小于内圈处。     

圆锥滚子轴承动态刚度分析

圆锥滚子轴承承受 5个方向上的载荷 ,相应地产生 5个方向上的位移 ,同时考虑到滚子的惯性力 ,导出了相应的刚度计算模型 ,并给出了计算实例 ,为轴承设计和工况选用提供了分析方法。附图 1幅 ,参考文献 4篇。     

A Fatigue Life Comparison of Two-Row Tapered Roller Bearings and Spherical Roller Bearings

Tests were run to compare the fatigue life of two-row tapered roller bearings to that of spherical roller bearings. Both bearing types had an outer diameter of 110 mm with the spherical roller bearing having a 22 percent larger dynamic radial load rating than the tapered roller bearings. All tests were run at 165 percent of the respective two-row dynamic radial load ratings. The results show that both the indirect mounting (double cup or outer ring) and the direct mounting (double cone or inner ring) tapered roller bearings gave significantly better fatigue lives than the spherical roller bearings. These results appear to contradict the present ISO 281 standard which assigns a 1.15 b_m rating factor to spherical roller bearings compared to a b_m rating factor of 1.10 for that of tapered roller bearings.     

Thermally-Induced Failures in Railroad Tapered Roller Bearings

An Association of American Railroads (AAR) class F (6 1/2 × 12) tapered-roller bearing assembly is modeled, using finite elements, to examine thermally-induced failures observed in the laboratory when the bearing is operating at relatively high speeds. It is hypothesized that this failure is caused by an unstable thermal expansion/internal bearing load feedback process. Sequentially-coupled, transient thermal and static structural models are used to obtain the thermal-mechanical transient time response as a function of speed, seal type, and lubricant starvation at the rib contact. The model assumes no external loads and zero initial preload (zero end-play). Therefore, the loads developed in the bearing are thermally-induced and self-equilibrated. Two train speeds, viz. 80 and 100 mph, are considered. Simulation results indicate that at axle rotational speeds equivalent to a train speed of 100 mph, a combination of grease starvation and heat flux from the contact seals cause high rib temperature and subsequent unstable load growth which will lead to failure. At rotational speeds equivalent to train speeds of 80 mph or for bearing assemblies that utilize special design seals, the rib temperature is relatively low and no operational instabilities were observed for the model used.     

圆锥滚子轴承优化设计系统

着重对圆锥滚子轴承计算机辅助优化设计的数学模型和约束条件的建立以及优化原理进行了详细的论述，该系统的使用实现了圆锥滚子轴承的智能化设计和绘图，提高了设计效率。     

圆锥滚子轴承半自动装配机

改进现用圆锥滚子轴承装配的手工模式,开发了圆锥滚子轴承半自动装配机,介绍了该装配机的结构组成、工作原理及其适用范围。