【作者】 胡艳涛；

【导师】 邢英杰；

【作者基本信息】 大连理工大学 ， 机械设计及理论， 2010， 硕士

【摘要】 圆柱滚子轴承在承载状态下,滚子的两侧端部在和内、外滚道接触处会产生高度应力集中,由此所导致的疲劳破坏、剥落会向中间发展,导致整个轴承失效,大大减少了轴承的寿命。对滚子进行凸度设计后,即将滚子的直母线改为凸度母线,能有效地改善滚子和内外圈接触区的应力分布,对提高轴承的使用寿命有很大帮助。目前,发达国家对圆柱、圆锥滚子轴承滚子都要求带凸度,因此对滚子凸度设计的研究就很重要,即能提高轴承本身的寿命,还能增加国家在轴承设计上的技术优势。本文利用有限元分析软件ANSYS进行对数母线滚子凸度的设计,对不同载荷,不同凸度量下的接触区的应力分布做了详细的比较分析,最后得到了一个较为合理的凸型和凸度量区间。另外,轴承滚子的表面粗糙度对轴承的寿命也有很大的影响,较低的粗糙度值对降低摩察系数,减小噪声,提高滚子旋转精度等起到明显的作用。考虑到电化学机械光整加工在改善表面粗糙度方面所起到的效果,本文提出了轴承滚子的电化学机械复合光整加工,设计和制造了电化学机械光整轴承滚子的实验装置,包括电源、电解液循环系统、滚子的运动系统、机械磨削装置和阴极的进给装置等,并通过正交实验初步研究了工件转速、电流密度、砂带压力、砂带粒度和加工时间等工艺参数对轴承滚子表面质量的影响。研究结果表明,电化学机械复合光整技术在降低滚子的表面粗糙度方面作用明显。该方法工艺简单,易操作,具有很好的实用性。利用直母线加工轴承滚子的优化参数,设计和制造了圆弧型阴极,尝试加工凸度滚子,把电流和加工时间作为影响凸度加工的重要参数,设计了新的实验表,实验结果表明,电化学机械复合光整加工技术能够在降低滚子表面粗糙度的同时,实现凸度的加工。更多还原

【Abstract】 High stress concentration happens on both sides of the rollers, also the inner and outer raceway generating lines, when cylindrical roller bearing is in a state of being loaded. The stress concentration mentioned above often leads to further development of fatigue collapse and breakingoff toward to the core, which could make the entire bearing fail. This plays an important role in the decaying of the bearing life.The design of crowning roller, which changes the direct bus of roller to crowning bus, can effectively improve the stress distribution of rolling contact zone. At present, the developed countries require the cylindrical, tapered roller to be with crowning profile. So it becomes very important to do research into the design of crowning roller. By means of finite element method software ANSYS, the design of roller with logarithmic profile has been done. Through the comparison of stress distribution of contact zone under different loads, finally get a more reasonable crowning profile and crowning metric.At the same time, the surface roughness of bearing roller has a great influence on the bearing life. The lower roughness can reduce the friction coefficient, noise and improve the precision of rotation. Research has proved that electrochemical mechanical finishing can improve the surface roughness greatly. This paper presents ECM-mech finishing of bearing roller, designs and manufactures a set of ECM-mech finishing equipment including power supply, recycle system of electrolyte, roller motion system, grinding device, cathode feeding device and so on. The influence of technologic parameters, such as speed of workpiece, electric current density, pressure of belt, granularity of belt and processing time have been researched primarily by orthogonal experiment, which provide the foundation for optimization of technological parameters. Finally experiments analysis shows that ECM-mech finishing can improve the surface quality and reduce the surface roughness greatly. The method is simple, practical and easy to operate.Then design and manufacture a crowning cathode, consider electric current density and processing time as the main parameters to do the experiment of crowning rollers. The results shows that ECM-mech finishing can not only reduce the surface roughness greatly, but also get the crowning profile.更多还原