The wear resistance research of the rail contact surface depending on the grinding process
The wear resistance research of the rail contact surface depending on the grinding process
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DOI：
10.20535/2521-1943.2019.86.181036
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发表时间：
2019-12
影响因子：
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通讯作者：
P. Protsenko;Yurii Borodii;M. Bobyr;E. Uhlmann;J. Thalau;Pavlo Lypovka
中科院分区：
文献类型：
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作者：
P. Protsenko;Yurii Borodii;M. Bobyr;E. Uhlmann;J. Thalau;Pavlo Lypovka
背景在钢轨与车轮接触期间，钢轨上的连续机械载荷导致钢轨表面层中残余应力的积累，从而导致快速增长的疲劳裂纹。此外，轮轨之间的相互作用导致轮轨接触过程中的微观和宏观滑移、磨粒磨损以及钢轨的塑性变形。钢轨打磨是一种修复方法，通过这种方法可以去除钢轨表面的缺陷材料层，提供必要的尺寸和形状精度以及表面质量。Objective.本工作的目的是确定磨削对轨面摩擦学性能的影响，并确定磨削过程的最佳参数，以确保轨面具有最佳的耐磨性。方法.在M-22 M摩擦试验机上对钢轨磨削表面试样进行了磨损和接触损伤的研究。研究通过样品（从铁轨上切下）与来自用于制造铁路车轮的材料的反样品的干摩擦进行，持续1小时，摩擦路径为3.60 km。在摩擦机上进行研究之前和之后，在VLR-200天平上对样品进行称重。因此，确定了每个样品的质量磨损值。结果基于摩擦学研究的结果，我们得到了图形的磨损强度上的样品的表面硬度和直方图，显示磨削工艺参数对样品的磨损强度的量的影响的依赖关系。在工作中考察了影响耐磨性的主要工艺参数有钢轨温度、切削深度、砂轮转速。研究结果可在铁路运输钢轨修磨中得到实际应用。结论.通过对试验数据的分析，得出了切削深度、试样表面硬度与试样磨损强度之间的经验关系。磨削工艺参数（轨温、切削深度、砂轮速度）对钢轨表面耐磨性的影响的本质得以确立。提供更高的钢轨表面耐磨性的工艺参数的最佳值是切割深度- 0.007 mm，砂轮速度- 30 m/s，钢轨温度- 20°C（最好在温暖的季节进行钢轨加工）。研究结果可在铁路运输钢轨修磨中得到实际应用。
Background. Continuous mechanical loads on the rails during its contact with the wheel lead to an accumulation of residual stresses in the surface layers of the rails, resulting in fast-growing fatigue cracks. In addition, the interaction of the wheel and the rail leads to micro-and macro-slip during their contact, abrasive wear, as well as plastic deformation of the rail. Rail grinding is the repair method by which defective material layers removes from the rail surface, provides the necessary accuracy of size and shape as well as surface quality. Objective. The aim of the work is to determine the effect of grinding on the tribological properties of the rail surface and establish the optimal parameters of the grinding process to ensure the best wear resistance of the rail surface. Methods. The research on wear and contact damage of samples of surfaces cut from grinding rails conducted on a friction machine M-22M. The studies were carried out by dry friction of a sample (cut from a rail) with a counter-sample from the material used in the manufacture of railway wheels, for 1 hour, the friction path was 3.60 km. Samples were weighed on a VLR-200 balance before and after the study was performed on the friction machine. As a result, the mass wear value was determined for each sample. Results. Based on the results of tribological studies, we obtained graphical dependencies of the wear intensity on the hardness of surfaces of samples and histograms which showing the effect of grinding process parameters on the amount of the wear intensity of samples. In the work was investigated influence the next main parameters of the grinding process on wear resistance there are the temperature of the rail, depth of cut, grinding wheel speed. The results of the work can find practical application in railway transport when repairing rails by grinding. Conclusions. Based on the analysis of experimental data, the empirical relationship revealed between the depth of cut, the surface hardness of the sample and the intensity of its wear. The nature of the influence of grinding process parameters (rail temperature, depth of cut, grinding wheel speed) on the wear resistance of the rail surface is established. The most optimal values of the process parameters that provide greater wear resistance of the rail surface are depth of cut – 0.007 mm, grinding wheel speed – 30 m/s, rail temperature – 20°C (it is better to conduct the processing of rails in the warm season). The results of the work can find practical application in railway transport when repairing rails by grinding.