The simple processing technology of bearings is smelting-casting-annealing-rough machining-quenching, tempering-finishing. The hardness of the workpiece after quenching and tempering is generally above HRC45. For high-hardness bearing steel parts, traditional cutting tools (carbide cutting tools and ceramic cutting tools) can no longer meet the processing requirements. The performance of cemented carbide tools will not be described in detail here. Currently, the tool materials suitable for processing high-hardness carbide steel parts include ceramic tools and cubic boron nitride tools. Ceramic tools are well known to be brittle and cannot be turned with large margins. Intermittent cutting is not allowed. If the deformation of the workpiece after heat treatment is small, the surface is smooth, and the margin is small, it is suitable to choose ceramic tools.

According to different workpieces, hardness, and allowance, select relatively suitable carbide tool grades and cutting parameters. The plan is as follows:

(1) Finely turned slewing bearing carbide raceway, end face, hardness HRC47-55, allowance<2mm. Cutting parameters: ap≤1mm, Fr=0.05-0.35mm/r, Vc=60-250m/min.

Processing effect: The tool life of cemented carbide is 7 times that of ceramic tools, and the surface roughness is controlled between Ra0.6-1.0.

(2) Finished turning to slew bearing carbide outer circle, end face, hardness HRC47-55, channel hardness HRC55-62; margin ≥ 2mm

Processing effect: The Carbide tool has a long tool life and can replace rough grinding, and the surface roughness reaches Ra0.4.

(3) Finely turned metallurgical carbide outer circle and inner hole, hardness HRC62:

Processing effect: Compared with foreign cutting tools, it has a longer service life and the surface roughness is within Ra0.8.