The general situation of the bearing

The general situation of the bearing - 2018 07 - 16 a, function as partner of bearing, bearing play an important role in the whole shaft system. It is generally located at the ends of the shaft, the main role is to support, fixed bearing, the shaft and connecting parts have a certain position. In addition, housing, generally with a sealing device, thus reducing the pollution of the bearing. Second, the material manufacture and the main material of the bearing steel ( Such as ZG45) , grey cast iron ( Such as HT200) , nodular cast iron ( Such as QT400 - 17) Or stainless steel, etc. Rolling mill bearing mainly adopts cast steel. Bearing blank instead of material, structure, and the choice of size and other factors. Size smaller bearing hole generally choose die casting, also can use solid casting; Use sand mold casting aperture is large; Generally choose die casting when mass production, to increase productivity and save material. Three, classified according to its structure can be divided into the split bearing housings, integral bearing seat, flange bearing, outside spherical bearing, etc. Mill in the main is the integral bearing seat. Four, the main technical points ( 1) Holes in the inner hole is plays a role of supporting and locating bearing the main surface, it is to match the bearing outer ring. Inner hole diameter size 7 is the general precision, accuracy requirement high general level 6, the shape of the inner hole precision generally control the aperture of tolerance range, for the high precision requirement of bearing seat, the shape of tolerance control in 1/3 ~ 1/2 diameter tolerance. In addition to the cylindricity and coaxial degree, hole axis straightness requirements should also be considered. In order to ensure the function of the parts and improve its wearability, inner hole surface roughness is commonly Ra3. 2 ~ Ra1。 6. （ 2) Hole axis to the distance of the ground to ensure the base and cover parallelism and size requirements. Five, and the maintenance of the bearing housing and bearing, should do maintenance on a regular basis, to find problems early, as soon as possible to improve productivity and economical. Bearing on its internal cleaning after removed, in order to remove impurities; Then observe the aperture plane of existence abrasion, knock against the phenomenon; After checking the aperture surface shape and dimension precision, look to whether accord with the requirement of the present, it is necessary to make repair or scrap processing.