Experimental Investigation on the Wear and Damage Characteristics of Machined Wheel/Rail Materials under Dry Rolling-Sliding Condition
Experimental Investigation on the Wear and Damage Characteristics of Machined Wheel/Rail Materials under Dry Rolling-Sliding Condition
复制标题
轮轨加工材料干滚滑磨损损伤特性试验研究
DOI：
10.3390/met10040472
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发表时间：
2020-04-01
期刊：
影响因子：
2.9
通讯作者：
Yu, Lang
中科院分区：
文献类型：
--
作者：
Liu, Peijie;Quan, Yanming;Yu, Lang
为了保证列车的平稳运行，钢轨打磨和车轮车削是消除表面缺陷的必要措施。已加工轮轨材料的表面完整性是影响其摩擦学性能的重要因素。本文首先在数控车床上对车轮试件进行车削，在外圆磨床上对钢轨试件进行磨削，并分别设定不同的加工参数。在此基础上，利用双盘磨损试验机系统地研究了干滚滑条件下轮轨盘的磨损和损伤行为。试验结果表明，轨盘加工后的表面硬度略高于轮盘，而轮盘的表面粗糙度和塑性变形层远大于轨盘。滚滑试验后，轨盘表面硬度增加程度和塑性变形层厚度均大于车轮盘。轮盘的磨损量远大于轨盘。轮轨盘表面粗糙度、硬度和加工后的塑性变形层对摩擦副的磨损行为有综合影响，具有合适原始表面硬度和粗糙度的摩擦副产生的磨损量最小。
To guarantee the smooth operation of trains, rail grinding and wheel turning are necessary practices to remove surface defects. Surface integrity of machined wheel/rail materials is significant to affect their tribological performance. In this paper, firstly, the wheel specimens were turned by a CNC lathe and the rail specimens were ground by a cylindrical grinding machine with various machining parameters. Then, the wear and damage behavior of the machined wheel/rail discs was systematically investigated via a twin-disc wear testing apparatus under dry rolling-sliding condition. The experimental results show that the surface hardness of rail discs after machining is slightly higher than that of wheel discs, while the surface roughness and plastic deformation layer of wheel discs are much larger than those of rail discs. The surface hardness increase degree of rail discs and their thickness of plastic deformation layer are greater than those of wheel discs after the rolling-sliding test. The wear loss of wheel discs is much larger than that of rail discs. Surface roughness, hardness and plastic deformation layer of wheel/rail discs after machining exert a comprehensive effect on the wear behavior, and friction pair with appropriate original surface hardness and roughness generates the smallest amount of wear loss.