Investigation of the fundamental knowledge to railway grinding by ways analyzing grinding tools and processes in correlation with operational behavior of track

通过钢轨打磨，可以从轨道表面去除有缺陷的材料层，并且可以实现所需的尺寸和尺寸精度。目前，尽管广泛的工业实施，但缺乏关于磨削工具、工艺参数和结果之间的相互作用以及它们对轨道的摩擦学特性和进一步的操作行为的影响的技术知识。因此，必须建立有关钢轨打磨的基本知识，并对这种修复技术与轨道的预期运行行为和寿命之间的相互作用进行鉴定。为了对钢轨打磨进行科学分析，IWF和MMI之间的合作是有目的的，因为这两个领域需要广泛的能力，制造技术（IWF）和摩擦力学（MMI）。国际合作的进一步动机是目前对铁路维护中互操作基础设施解决方案的高需求。项目方法以及初步工作是在国际合作准备活动范围内进行的，由DFG（UH 100/173-1）资助。研究项目分为两个资助期，每两年一次。在第一个资助期内，必须通过磨削和摩擦学试验，对磨削过程和环境条件对产生的轨道次表面和寿命的影响进行鉴定。此外，钢轨打磨和钢轨的摩擦学行为的模型将被开发。钢轨磨削模型特别考虑了磨削过程中的热发展对钢轨亚表面结构的影响。钢轨的摩擦学行为的模型将描述一个时间离散的材料疲劳不同的摩擦情况下的车轮/钢轨接触。在第二个资助期内，必须系统地扩大有关钢轨打磨的科学知识。分析了打磨工具和转向架规格对钢轨打磨效果和钢轨使用性能的影响。对钢轨/车轮系统的影响因素进行了广泛的分类，并对它们对磨削结果以及钢轨使用寿命的影响进行了定性。最后，将新生成的知识应用到钢轨打磨和钢轨摩擦学行为的模型中。还将进行项目文件编制和模型核查。

By way of rail grinding, defective material layers can be removed from track surfaces and the required dimension and size accuracies can be achieved. Currently, despite wide industrial implementation, there is a lack of technological knowledge concerning the interactions between grinding tools, process parameters and results, as well as their influence on the tribological properties and further operational behavior of the track. Hence fundamental knowledge about rail grinding has to be generated and the interactions between this repair technology and the expectable operational behavior and life time of the track have to be qualified. For the scientific analysis of rail grinding cooperation between the IWF and the MMI is intended, since broad competences in the two fields, manufacturing technology (IWF) and friction mechanics, (MMI) are needed. The international cooperation is further motivated by the current high demand for interoperable infrastructure solutions in railway maintenance. The project approach as well as preliminary work was carried out within the activities for preparation of the international cooperation, being funded by DFG (UH 100/173-1).The research project divides into two funding periods with the duration of each two years. Within the first funding period the influence of the grinding process and environmental conditions at generated track sub-surface and life time has to be qualified, which will be carried out by ways of grinding and tribological tests. Furthermore, models of rail grinding and the tribological behavior of rail will be developed. The rail grinding model particularly regards the heat development during the process with the influence on the sub-surface structure of rail. The model of the tribological behavior of rail will characterize a time-discrete material fatigue for different friction scenarios of wheel/rail contact. During the second funding period the scientific knowledge concerning rail grinding has to be systematically enlarged. The influence of the grinding tool and bogie specification on the results of rail grinding and the operational behavior of rail will be analyzed. The influencing factors on the rail/wheel system will be widely classified and their influence on the results of grinding as well as on the operational life time of rail will be qualified. Finally, the newly generated knowledge will be implemented into the models of the rail grinding and the tribological behavior of rail. Project documentation and model verification will also be carried out.