1. Function As a close partner of the bearing, the bearing seat plays an important role in the entire shaft system. It is generally located at both ends of the shaft, and its main function is to support and fix the bearing, so that the shaft and its connecting parts have a certain positional relationship. In addition, bearing housings generally have seals to reduce bearing contamination. 2. Material The main materials of the bearing housing are cast steel (such as ZG45), gray cast iron (such as HT200), ductile iron (such as QT400-17) or stainless steel. The rolling mill bearing housing is mainly made of cast steel. The choice of bearing housing blank is related to its material, structure and size. Bearing holes with small diameters are generally cast in steel molds, or solid castings can be used; sand molds are used for larger diameters; steel molds are generally used in mass production, which can improve productivity and save materials. 3. Classification The bearing seat can be divided into split bearing seat, integral bearing seat, flange bearing seat, outer spherical bearing seat and so on according to its structure. Rolling mills are mainly used in integral bearing housings. Fourth, technical points (1) Inner hole The inner hole is the most important surface of the bearing seat for supporting and positioning, and it cooperates with the outer ring of the bearing. The dimensional accuracy of the diameter of the inner hole is generally grade 7, and grade 6 is generally used for those with high precision requirements. The shape accuracy of the inner hole is generally controlled within the aperture tolerance range. For bearing housings with high precision requirements, the shape tolerance is controlled within 1 of the aperture tolerance. /3~1/2. In addition to cylindricity and coaxiality, the requirements for straightness of the hole axis should also be considered. In order to ensure the function of the part and improve its wear resistance, the surface roughness of the inner hole is generally Ra3.2~Ra1.6. (2) The distance from the axis of the hole to the ground ensures the parallelism and size of the base and the upper cover. Fifth, the maintenance and maintenance of the bearing housing The same as the bearing, the bearing housing must be regularly maintained and maintained, so as to find the problem as soon as possible and solve it early, and improve the productivity and economy. After the bearing seat is removed, clean the inside of it to remove impurities; then observe whether the aperture surface is worn or bumped; then check the shape and dimensional accuracy of the aperture surface to see if it meets the current requirements, it is necessary Repair or scrap from time to time.