Slewing Bearing Technology Improvement and Performance Improvement

Sep 01, 2021

Slewing bearings occupies an important position in the use of equipment in many industries, such as construction machinery, ships, automation, photovoltaics, etc. In order to make the equipment run better, reduce wear and extend its life, the performance of the slewing bearing can be improved from the following processes:

1. Improve the quality of 42CrMo and 50Mn steel, and strictly control the content of chemical composition and the level of non-metallic inclusions, which is an important basis for improving the quality of slewing bearings.

2. In the production process, due to the large machining allowance of the blank, large cutting stress may be generated and quenching deformation may be increased. In order to increase accuracy and reduce deformation, stress relief annealing can be carried out after rough turning.

3. Improve the design of the slewing bearing. The steel ball arc raceway has been widely adopted abroad. The structure is uniformly stressed, directly polished after quenching, without grinding, which can prevent defects such as cracks in the raceway.

4. The large turntable bearing not only requires the surface of the raceway to be wear-resistant, but also has a certain strength. After quenching and tempering, the depth of the hardened layer must be increased as much as possible. The actual test proves that increasing the hardened layer to 3-4mm can strengthen the strength of the raceway.

5. The processing quality of the slewing ring bearing itself is greatly affected by manufacturing accuracy, axial clearance and heat treatment. The element that is easy to ignore here is the effect of heat treatment. Obviously, in order to prevent cracks and depressions on the surface of the raceway, it is necessary that the raceway surface has sufficient hardness, sufficient hardened layer depth and core hardness. The depth of the hardened layer of the raceway should be thickened as the rolling elements increase. The manufacturing accuracy of the slewing bearing is critical to the heat treatment process. Reduce the intermediate frequency quenching speed, try to obtain a larger surface hardness and hardening depth, to prevent quenching cracks on the surface of the raceway.