Henan San Kuang Machinery Technology Co., Ltd.
Henan San Kuang Machinery Technology Co., Ltd.
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Main Products: Gear Shaft, Gear Ring, Non-Standard Custom-Made, Washing and Separating Equipment
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Home > Blog > Heavy-Duty Large Slewing Bearing Custom Manufacturing | Induction Hardened HRC 55+ · Case Depth ≥4mm

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Heavy-Duty Large Slewing Bearing Custom Manufacturing | Induction Hardened HRC 55+ · Case Depth ≥4mm

Mr. He September 3, 2026

Henan Sankuang Machinery Technology Co., Ltd., located in Luoyang Heavy Equipment Manufacturing Base, specializes in R&D and precision machining of slewing bearings with diameters from 500mm to 3,000mm and accuracy grades P0, P6, P5, and P4. Slewing bearings are large special-structure bearings capable of simultaneously withstanding axial loads, radial loads, and overturning moments, integrating support, rotation, transmission, and fixing functions.

Core Manufacturing Process (Patented Technology Route):

  1. Forging Blank Inspection: Check material and forging condition for lamination/cracks; measure ID/OD and height to calculate machining allowance and turning passes.

  2. Turning Operations:

    • Rough turning: 5 RPM, 10–12mm cut depth

    • Rough turning aging: 3-point support, horizontal placement (no stacking), ≥48 hours

    • Finish turning: 6–8 RPM, 0.3–0.5mm cut depth

    • Profile finish turning: Unclamped/unloaded condition, 8 RPM, 0.2mm cut depth (critical for deformation prevention)

  3. Raceway Induction Hardening: Hardness ≥55HRC, case depth ≥4mm, soft zone width <50mm, with "S" marking at soft zone.

  4. Post-Hardening Tempering: 48 hours at 200°C for complete stress relief.

  5. Gear Hobbing/Milling: Accuracy Grade 8 or above.

  6. Drilling: Layout positioning, hole tolerance ≤3%; split inner ring mounting holes machined together, hole spacing error ≤5% at 180° opposite soft zones.

  7. Grinding:

    • Rough grinding: 36-grit porous resin wheel, 1500 RPM, max depth ≤1mm

    • Finish grinding: 46 or 60-grit resin wheel

Materials: 42CrMo, 50Mn, GCr15SiMn high-quality alloy steel forgings.

Applications: Construction machinery (excavators, cranes), mining equipment (stacker-reclaimers), port machinery (ship unloaders), wind power (yaw/pitch bearings).

Delivery Documents: Material certificates, hardness test reports (with case depth records), dimensional inspection reports, UT/MT inspection reports.


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