扭矩对试验机转轴微动损伤特性的影响

发布时间：2018-02-27 06:05

本文关键词： 试验机转轴制动力矩微动损伤　出处：《西南交通大学学报》2017年05期 　论文类型：期刊论文

【摘要】：为了探索扭矩作用下转动轴的微动损伤特性,利用JD-1轮轨模拟试验机,通过改变载荷大小,研究了制动力矩对转轴与轴承内圈过盈配合面微动损伤特性的影响,并借助激光扫描共聚焦显微镜和扫描电子显微镜观察损伤表面的磨痕和剖面微观组织,分析了不同扭矩载荷下转轴表面的微动损伤机理.结果表明:在垂向试验载荷和制动力矩的作用下,试验机转轴在与左右两端轴承内圈过盈配合面处出现了微动损伤,磨损形式主要表现为磨粒磨损和粘着磨损;随着制动力矩的增加,转轴配合面的表面磨损加剧,塑性变形层变厚约75%,微动损伤变得更严重;左端配合面的磨损和塑性变形均比右端严重,两端配合面处的塑性变形层厚度分布不均;转轴配合面处产生了微裂纹,且左端产生的裂纹多于右端,微裂纹的数量随着制动力矩的增加而增多了约6倍,裂纹扩展角度也变大约50%.
[Abstract]:In order to explore the fretting damage characteristics of rotating shaft under torque, the influence of braking moment on fretting damage characteristics of interference fit surface of rotary shaft and bearing inner ring was studied by using JD-1 wheel-rail simulation testing machine. Laser scanning confocal microscopy and scanning electron microscope were used to observe the wear marks and microstructures of the damaged surface. The fretting damage mechanism of the rotating shaft surface under different torque loads is analyzed. The results show that under the action of vertical test load and braking torque, the fretting damage occurs between the rotary shaft of the testing machine and the interference fit surface of the inner ring of the left and right ends of the bearing. The wear forms are mainly abrasive wear and adhesion wear, with the increase of braking torque, the wear on the surface of the shaft surface increases, the plastic deformation layer becomes thicker about 75%, and the fretting damage becomes more serious. The wear and plastic deformation of the left side are more serious than that of the right side, the thickness of plastic deformation layer at the two ends of the fit surface is uneven, and there are microcracks at the axis surface and more cracks on the left end than on the right end. The number of microcracks increases by about 6 times with the increase of braking torque, and the angle of crack propagation is about 50%.
【作者单位】：西南交通大学牵引动力国家重点实验室摩擦学研究所;
【基金】：国家自然科学基金资助项目(51475393)
【分类号】：TH117.1

【相似文献】