轴承凸度滚道及其电化学机械复合加工方法研究

发布时间：2018-06-02 23:00

本文选题：轴承滚道 + 凸度成形　；参考：《中国石油大学（华东）》2012年硕士论文

【摘要】：轴承的寿命、振动和噪声则是轴承质量的综合反映。依据过去的理论研究成果，把圆柱滚子轴承的滚道由直母线改为具有凸度母线，同时大量降低滚道表面的粗糙度，是改变滚道表面物理力学性能、提高轴承的旋转精度和耐磨性、改善滚动接触区应力分布、降低轴承震动和噪音、避免轴承过早失效、提高轴承的寿命的有效手段。而相对于轴承滚道传统磨削加工存在的一些问题，例如工具（砂轮、油石）损耗大、滚道表面质量差、成型工艺复杂，凸度值不易控制，以及加工效率低等难以解决的矛盾，电化学机械加工方法具有加工表面质量好、表面微观几何形貌优良、加工不受工件材料硬度影响以及加工成本低、加工效率高等优点。因此，针对影响轴承使用性能和寿命的关键——滚道表面质量和形状问题，本文将电化学成型与电化学机械光整加工技术集成应用于轴承滚道加工，力求在实现轴承滚道光整加工的同时，实现滚道的凸度成型。针对电化学机械加工轴承滚道过程中的关键问题，本文所做的主要工作包括：（1）对轴承滚道疲劳失效机理、凸度修正理论、凸度获取技术等问题进行了详细分析；（2）通过对有限长弹性半空间体线接触问题的分析，以及利用有限元数值分析方法，，研究轴承滚道凸度技术对接触应力分布的影响。（3）针对传统机械磨削和超精加工方法实现轴承滚道凸度及表面质量存在的局限性，提出用电化学机械复合法构建轴承滚道的凸度，在建立相关实验装置的基础上，进行了实验研究，得到电化学机械复合加工轴承滚道凸度的基本规律，为最终将其应用于实际生产加工奠定基础。
[Abstract]:Bearing life, vibration and noise is a comprehensive reflection of bearing quality. According to the previous theoretical research results, changing the raceway of cylindrical roller bearings from direct busbar to convex busbar, and greatly reducing the roughness of raceway surface is to change the physical and mechanical properties of raceway surface. It is an effective means to improve the rotation accuracy and wear resistance of bearings, to improve the stress distribution in rolling contact areas, to reduce the vibration and noise of bearings, to avoid premature failure of bearings, and to improve the life of bearings. Compared with the traditional grinding process of bearing raceway, some problems exist in traditional grinding, such as large wear of tools (grinding wheel, oil stone), poor surface quality of raceway, complex forming technology, difficult to control the crown value, and low processing efficiency, etc. Electrochemical machining (ECM) has the advantages of good surface quality, good microcosmic geometry, no influence of workpiece hardness, low machining cost and high machining efficiency. Therefore, aiming at the problem of the surface quality and shape of the raceway, which affects the performance and service life of the bearing, this paper applies the electrochemical forming and electrochemical mechanical finishing technology to the bearing raceway processing. In order to achieve the bearing roller finish processing, to achieve the profile of the raceway. Aiming at the key problems in the electrochemical machining of bearing raceway, the main work in this paper includes the fatigue failure mechanism of bearing raceway and the crown correction theory. Through the analysis of the linear contact problem of the finite length elastic half-space body and the finite element numerical analysis method, the problem of obtaining convexity is analyzed in detail. The influence of bearing raceway crown technology on contact stress distribution. (3) aiming at the limitation of traditional mechanical grinding and super-finishing methods to realize bearing raceway crown and surface quality, an electrochemical mechanical compound method is proposed to construct bearing raceway crown. On the basis of the establishment of the related experimental equipment, the basic law of the raceway crown of the electrochemical mechanical composite machining bearing was obtained, which laid a foundation for its application in practical production and processing.
【学位授予单位】：中国石油大学（华东）
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3;TG65

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