How to improve slewing bearing strength and rigidity of raceway surface?

1, Improving ring material including control the content of chemical components and the control the grade of non-metallic inclusions is one of the important measures to improve the quality of slewing bearing.

2, Because the tolerance is big relatively at beginning of process, the cutting stress could increase the quenching distortion. In order to improve the accuracy and reduce the deformation, it is valued to add annealing process by pit furnace after rough turning.

3, Improve the slewing bearing design that adopt steel ball arc raceway (steel ball diameter 25mm). This structure makes homogeneous stress and the raceway finish 6. It can be polished directly after quenching without grinding and can prevent cracks in the raceway.

4, large supporting not only requires the raceway surface wear-resistant, but also have a certain strength, in addition to quenching and tempering, we must try to increase the depth of hardened layer. It is proved that the strength of the raceway can be improved by increasing the unit heating power of the medium frequency quenching (from the original 1.6Kw/mm2 to 2.4Kw/mm2) and decreasing the heating rate, so that the hardened layer is increased to 3-4 mm.

5, In order to stabilize the substance structure and improve the dimensional stability of large supporting parts, the grinding parts must be tempered at low temperature to eliminate the grinding stress and prevent the crack.

6, The flame hardening on raceway surface can reach hardened layer (3-4mm), and even save energy, low cost, easy to manufacture heaters and so on. Many practices have proved that the raceway with flame quenching never has cracks, so the flame quenching process can be applied.