Motor bearing testing standards

2020 - motor bearing testing standards 12 - 05 bearing is critical in the motor running, how to judge of bearing in the process of repair. 1, bearing should be no crack after cleaning, the surface has no metal flake, the phenomenon such as corrosion, pitting and overheating, holder should not become loose, deformation, the phenomenon such as jamming and severe wear, otherwise should be replaced. 2, bearing clearance fit, flexible rotation, no obvious shaking or overheating, general bearing clearance shall comply with the following table: 3, when the bearings do not meet above requirement, or maturity, in the operation of the service life have different sounds, etc. , should replace new bearing, a new bearing model is the same as the original bearing, precision, as well as structure should comply with the requirements. 4, new bearing must be oil or bearing heater uniform heating, the temperature should not exceed 100 ℃, the bearings must be cushioned, shall not use hammer knock directly, and check should be installed, bearing should be appropriate use of special tools, general big bearing should be used to heat down, lest hair shaft neck. 5, lubricating grease should be clean without impurities, agglomerate, moisture, metamorphism, model is correct, may also use a different type of grease. Grease usually used for 3 #, 4 # molybdenum disulfide, pitted for bearing cover of lumen 1/22/3 ( High-speed, 1/2, 2/3) at low speed 。 6, eccentric shaft neck without traces, elliptical cracks, burrs, and serious damage, a damage shaft neck should use iron plating chromium, plating, repair welding and set set of methods for processing, processing should pay special attention to cooperate with the concentricity and the size of the core shaft precision, large motor shaft after welding, should be heat treatment, in case of stress concentration and broken shaft accidents.