What is the basic requirement for rolling bearing steel

A, wear-resisting performance Bearing work, not only between race, rolling element and cage rolling friction, and sliding friction will occur, so that the bearing parts wear continuously. To reduce the number of bearing parts wear, keep bearing accuracy stability, prolong the service life, bearing steel should have good wear resistance. Second, the contact fatigue strength Structure Of TIMKEN 30207 Bearing [login to view URL] under the action of cyclic load, the contact surface is easy to fatigue failure, namely appear cracked spalling, this is the main bearing damage forms. Therefore, in order to improve the service life of the bearing, bearing steel must have a high contact fatigue strength. Three, hardness Hardness is one of the important quality of bearing quality, the contact fatigue strength, wear resistance, elastic limit has a direct impact. The hardness of bearing steel in the condition of using general to achieve HRC61 ~ 65, bearing can get high contact fatigue strength and wear resistance. Three, the processing performance Bearing parts in the process of production, after a lot of cold and hot working process, in order to meet the requirements of mass, high efficiency, high quality, bearing steel should have good processing performance. For example, the cold and hot forming properties, machinability, hardenability, etc. Fourth, rust resistance In order to prevent bearing parts and finished products during processing, storage and use of corrosion rust, for bearing steel should have good rust resistance. Bearing steel in addition to the above basic requirements, should also reach the appropriate chemical composition, less uniform and internal organization, non-metallic inclusion, internal accord with a standard surface defect and surface decarburization layer does not exceed the prescribed concentration requirements, these projects are clearly defined in the standard of raw materials. Axial ring and shaft with transition fit, seat and axial dynamic coordination, and are often installed in pairs. In the installation at the same time, should also pay attention to test its axial clearance, and together with the shaft rotational axis and verticality of shaft centerline. The installation of the cone bearing cone hole are bearing more than diameter of conical bore self-aligning ball bearings, cylindrical roller bearings and spherical roller bearing. This kind of bearings can be installed directly on a taper shaft neck, can also use a cone sleeve or withdrawal, installed in a cylindrical shaft neck. Cone bearing fit requirement, generally more closely. Install the clothes after all needs to measure the bearing radial clearance. Because with its tightness is not determined by the journal of tolerance, but according to the distance on the surface of the bearings when installation, press it into a tapered bearing radial clearance caused by reduction is determined, and press it into the greater the distance, radial clearance reduction is more and more, bearing fit more and more closely; On the other hand, the pressure into the smaller the distance, radial clearance reduction is less, bearing fit or is loose. Thus it can be seen that the matching of the cone bearing tightness, completely before and after the installation is to rely on bearing radial clearance reduction is guaranteed. Here to ensure the quality of the installation of the cone bearing and excerpts from the part of the former Soviet union self-aligning ball bearing radial clearance of the original allowed to reduce the quantity, and German FAG company regulations have a tapered hole cylindrical roller bearing radial clearance reduction is, and has a conical hole of spherical roller bearing radial clearance reduction is, available for measuring cone bearing before and after the installation of radial clearance.