According to the national standard GB / T6391-1995 predetermined calculation method wheel rolling bearing basic rating applies when carrying apos common quality hardened steel (steel vacuum degassing means), according to good manufacturing method, and a rolling contact surface morphology Basically designed scroll wheel bearings. Beyond the above-mentioned scope, the bearing load capacity of the turntable will be affected.
1. Influence of material The slewing bearing steel is different in the smelting method. The size, promulgation and content of the inclusions in the material are also different. This difference in village quality will have a favorable or adverse effect on the bearing capacity of the slewing bearing. If ordinary electric furnace slewing bearing steel is used, the load bearing capacity of the slewing bearing will decline to varying degrees. On the other hand, if the slewing bearing steel such as vacuum remelting or electroslag remelting or other steel materials with equivalent materials is used, the load bearing capacity of the slewing bearing will be improved to varying degrees.
2. Influence of temperature The working temperature of the general slewing bearing can reach 120°C (the measuring temperature of the outer ring is 100°C). For working conditions exceeding this limited temperature, turntable bearings made of special (stabilized) heat treatment or special (heat-resistant) materials should be used.
When the slewing ring bearing is often used at a temperature of 120° C. or higher, or used at extremely high temperatures for a short time, the structure of the slewing ring bearing material will change, resulting in a reduction in the bearing capacity of the slewing ring bearing. The base influence relationship can be expressed by
Cr=gtC
Where Cr ----------- is the basic rated load corrected by over temperature;
Gr------------ temperature factor, gr factor can refer to Table 1-39 value.
Table 1-39 gr values
Working temperature/C<120125150175200225250300
Gr1.000.950.900.850.800.750.700.60
