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，并可以达到所需的尺寸和尺寸精度。目前，尽管在工业上得到了广泛的应用，但对于磨具、工艺参数和结果之间的相互作用，以及它们对磨轨摩擦学性能和进一步运行行为的影响，还缺乏技术知识。因此，必须掌握有关钢轨打磨的基本知识，并且必须对这种修复技术与轨道的预期使用性能和寿命之间的相互作用进行鉴定。对于钢轨磨削的科学分析，IWF和MMI之间的合作是目的，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)。目前铁路维护领域对可互操作的基础设施解决方案的需求很高，进一步推动了国际合作。项目办法和前期工作是在DFG(UH 100/173-1)资助的国际合作筹备活动范围内进行的。研究项目分为两个资助期，每期两年。在第一个资助期内，必须对磨削工艺和环境条件对产生的轨道次表面和寿命的影响进行鉴定，这将通过磨削和摩擦学试验进行。此外，还将建立钢轨磨削和钢轨摩擦学行为的模型。钢轨磨削模型特别考虑了磨轨过程中的热发展及其对钢轨亚表层组织的影响。钢轨的摩擦学行为模型将描述轮轨接触的不同摩擦情景下的时间离散材料疲劳。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。分析磨具和转向架规格对钢轨磨削结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鉴定。最后，将新产生的知识应用到钢轨磨削和钢轨摩擦学行为的模型中。还将进行项目文件和模型验证。

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.