高速轴承滑蹭试验台设计及动态特性分析

摘要

Skidding damage is one of the key problems which restrict the work performance and service life of high speed rolling bearing. High speed rolling bearings often work under harsh conditions of high temperature and vibration. This paper develops a skidding damage simulation test rig of high speed rolling bearing under high temperature and excitation conditions. The simulation test rig is helpful for researching the failure mechanism of skidding damage of high speed rolling bearing under complex conditions. The inner ring specimen and rolling element specimen are respectively driven by two high speed motorized spindles to simulate their dynamic contact under different slip ratio, radial load, rotating speed, excitation load, temperature and lubricating conditions. The principle and structure of the test rig are discussed, and dynamic characteristics of the main shaft are analyzed based on ANSYS workbench to investigate its nature frequency and analyze the effect of excitation load on its deformation. The analysis results provide reliable bases for setting the parameters of the test rig.%打滑蹭伤是制约高速滚动轴承工作性能和服役寿命的关键问题之一。高速轴承工作时往往还伴随高温、振动等严苛工作条件，开发高速轴承在高温、激振环境下的滑蹭模拟试验台有助于实验研究高速轴承在复杂工况下的打滑蹭伤机理。采用双电主轴分别驱动轴承内圈和滚动体试样，模拟在不同滑差率、径向载荷、转速、激振载荷、温度、润滑等工况条件下，轴承内圈与滚动体试样之间的动态接触。讨论了试验台工作原理和结构设计，利用ANSYS Workbench对试验台主轴进行了模态分析，调查其固有频率，并分析了激振载荷对主轴变形的影响，为试验台的参数设置提供依据。