UHD provides a modular CBN insert solution for hard turning HRC60–64 GCr15 bearing rings, helping bearing manufacturers control raceway profiles, surface quality, tool life, and production consistency across roughing, finishing, and grooving operations.
Keywords: GCr15 bearing hard turning · CBN insert solution · bearing raceway machining · HRC60–64 hardened steel cutting · UHD
Designed for inner and outer rings used in deep‑groove ball bearings and cylindrical roller bearings. After quenching hardness reaches HRC60‑64, hard turning replaces partial grinding processes. Tool‑edge stability and profile retention directly affect bearing noise, service life and assembly tolerance.
Hard turning of HRC60+ bearing steel cannot rely on a single CBN insert to finish all features. Uneven heat‑treatment allowance, intermittent cutting, local impact load and progressive flank wear easily lead to edge chipping, dimensional drift, raceway profile distortion and fluctuating surface roughness. UHD divides machining tasks according to machining feature, cutting condition and quality target to allocate corresponding CBN grades and geometries.
Hover over a tooling module below to view its recommended application. The configuration can be refined according to machine rigidity, interruption level, stock allowance, and required finishing target.
For bearing ring end‑face roughing and preliminary raceway machining under stock variation or oil‑hole interruption. Absorb roughing impact, keep remaining stock uniform to relieve finishing tool burden.
For high‑speed hard finishing of raceways and bores. Excellent wear resistance, keeps profile stability and surface quality for ordinary mass‑production bearing rings.
For high‑end precision bearings, strict requirements for raceway surface integrity, low noise and long fatigue life. Realize stable ultra‑precision hard turning.
Special for seal grooves and lubrication oil grooves. Independent grooving geometry ensures groove width, bottom fillet and side‑wall quality, prevent corner collapse of general turning inserts.
Assigning impact‑resistant CBN to roughing reduces the effect of unsuitable tool use under variable or interrupted conditions.
Finishing inserts focus on profile and dimensional retention, helping reduce batch‑to‑batch variation in critical raceway features.
Clear tool roles make wear behavior easier to monitor and reduce unplanned tool changes caused by edge failure.
Dedicated roughing, finishing, and grooving modules help limit rework, downtime, and quality risk associated with one‑tool‑for‑all methods.
As a manufacturer of superhard cutting tools, Henan UHD Ultrahard Tools Co., Ltd supports CBN insert selection, non‑standard tooling adaptation, and process‑oriented technical coordination for bearing hard‑turning applications.
Tell us your workpiece, quantity, and tooling requirement. Our team will reply with a practical solution.
