INA powder metallurgy bearing failure experience method

INA bearing failure is often the case in the process of operation, so you don't have a cow. Malfunctioned, judgment and processing is the key. When institutions, installation of bearing parts allowed to have a certain temperature, when the hand touch body shell, should not feel hot as normal, conversely indicates that bearing temperature is too high. The cause of the high bearing temperature are: lubricating oil quality does not conform to the requirements or metamorphism, lubricating oil viscosity is too high; The assemble tight ( Inadequate clearance) ; Bearing assembly too tight; Bearing race in internal rotation shaft or housing; Too much load; INA bearing cage or rolling body fracture, etc. Some experience of machinist lack of identification of powder metallurgy bearing, as long as see the powder metallurgy bearing no obvious damage will continue to use, so that cause serious failure later. Also somebody just remove the powder metallurgy bearings, without check and replace, sometimes it can continue to use the INA bearing is changed. Technology of powder metallurgy bearing condition should be check on dedicated tester, also can use dial indicator for some data measurement. But for general machinist, when does not have these conditions, can roughly check experience way. ( 1) The method of observation. With the naked eye observation of powder metallurgy bearings, inner and outer raceway should not crumbling and serious wear and tear, and in a circular groove; All the roller surface should be no spots, cracks and peeling phenomenon; Cage should not loose, without damage, did not wear out, and the roller clearance but big. ( 2) The shooting method. Normal inner and outer race and rolling elements of bearing clearance is zero. 005-0. 010 mm. To have used a stage in powder metallurgy bearings, fingers hold the seat for the axial shaking, should have no obvious shaking noise. ( 3) The rotation method. With one hand holding the bearing inner race, another hand rotating seat, INA bearings should be flexible rotation, and should not feel radial shaking. Check, should combine the above 3 kinds of methods, to facilitate technology of powder metallurgy bearing state to make the right judgment. For tapered roller bearing, still should observe whether rolling body is located in the middle of the outer race, if you have moved forward, should not be more than 1. 5 mm. Powder metallurgy bearings work in allow a slight noise, if you have any abnormal noise or excessive noise or sound, suggests that INA bearing failure. Powder metallurgy bearing causes of noise is more complex, one is the bearing inner and outer surface wear. Due to this kind of wear and tear, damage the bearings and shell, INA bearings and shaft cooperate relationship, lead to axis deviation from the correct position, when axis at high speed movement produces sound. When the bearing fatigue, its surface metal flake, also can produce sound make bearing radial clearance increases. In addition, the bearing lubrication, form dry