Increased rolling strength and friction reduction for bearings and homokinetic joints due to innovative hard machining

由于创新的硬加工，提高了轴承和等速接头的滚动强度并减少了摩擦

• 批准号: 200405159
• 负责人: Professor Dr.-Ing. Berend Denkena
• 金额: --
• 依托单位: Institut für Maschinenkonstruktion und Tribologie (IMKT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/200405159?language=en
• 关键词: Increased; rolling; strength; friction; reduction

The fatigue life time and the friction conditions are limiting factors during the operation of bearing components. These factors are many influenced by the surface integrity properties residual stresses and surface topography within the contact area and the prevailed stresses. The goal of this application is to desgin and create an optimal surface integrity state for bearings and homokinetic joints by an innovative hard machining process. The necessary surface integrity will be induced by reliable and finacial processes. Due to analyzing roller bearings and homokinetic joints the tribologiy states full lubrication and mixed friction are considered in this application. In the first application periode the focus stays on the roller bearings. Due to the processes hard turning and deep rolling the necessary residual stresses and surface topography can be created, altough the processes have to be adjusted to each other. For a very low surface roughness, the deep rolling can cause a deterioation of the surface quality. A created model to calculate the lifetime of bearings can consider the preconditions due to residual stresses and shows an improvement of the lifetime. To analyse the effects for the mixed friction in homocinetic joints, the significant to affect the surface integrity due to process parameters for the milling will be determined at the end of this period. The following application will increase this knowledge. For the roller bearing a financial and reliable process combination of hard truning and deep rolling, turn-rolling, and its effects on the surface integrity will be analyzed. The created models for the full lubrication will be verfied in statitical lifetime tests of the bearings. For the homocinetic joints the influence of the milling process and cutting edge geomtry on the surface integrity, residual stresses and topography, are going to be examined. Finally the effect of the different topography an residual stress state will be analyzed in means of the tribology conditions and lifetime. The results will show, that the models for the full lubrication can be tranfered to the mixed friction area.

疲劳寿命和摩擦条件是轴承部件运行期间的限制因素。这些因素受到表面完整性、接触区域内的残余应力和表面形貌以及主要应力的影响。该应用程序的目标是通过创新的硬加工工艺为轴承和等速万向节设计和创建最佳的表面完整性状态。必要的表面完整性将通过可靠和完善的工艺来实现。通过对滚动轴承和等速万向节的分析，本文考虑了摩擦学状态下的全润滑和混合摩擦。在第一个应用阶段，重点放在滚子轴承上。由于硬车削和深滚的工艺，可以产生必要的残余应力和表面形貌，尽管这些工艺必须相互调整。对于非常低的表面粗糙度，深滚压会导致表面质量的恶化。所建立的计算轴承寿命的模型可以考虑由于残余应力的先决条件，并显示寿命的改善。为了分析等速接头中混合摩擦的影响，将在本阶段结束时确定铣削工艺参数对表面完整性的影响。下面的应用程序将增加这方面的知识。对于滚子轴承，将分析硬车削和深滚压、车削滚压的经济可靠的工艺组合及其对表面完整性的影响。所建立的全润滑模型将在轴承静态寿命试验中得到验证。对于等速万向节的铣削工艺和切削刃几何形状的表面完整性，残余应力和地形的影响，将被检查。最后从摩擦学条件和寿命两个方面分析了不同形貌对残余应力状态的影响。结果表明，完全润滑区的模型可以推广到混合摩擦区。