Brand provides a process-specific CBN tooling solution for carburized and quenched 20CrMnTi gear shafts. It separates roughing, finishing and groove machining to improve interrupted-cutting reliability, dimensional consistency and surface-finish stability.
Keywords: 20CrMnTi gear shaft hard turning · HRC60–64 CBN inserts · gear shaft hard machining · interrupted cutting CBN tooling
Typical Workpiece and Machining Scope
Designed for active shafts, input shafts and output shafts after carburizing and quenching, where hard turning must cover both continuous and interrupted features.
- Material condition: 20CrMnTi carburized and quenched steel, HRC60–64
- Typical features: journals, gear end faces, spline positions, radii and relief grooves
- Primary challenges: edge chipping, size drift, unstable roughness and inefficient groove machining
Recommended CBN Insert Configuration
The core method is process-layered, feature-specific tooling: impact resistance for roughing, controlled wear for finishing, and dedicated geometry for grooves. Hover over an insert series to view its application focus and matching image.
Integral Brazed CBN Insert Series
For journal roughing, interrupted gear end-face cutting and spline-area roughing. Its role is stable stock removal under impact loads and reduced risk of sudden edge chipping.
Coated CBN Insert
For high-speed finish turning of journals and radii. Suitable where predictable wear behavior, dimensional consistency and stable surface quality are required in batch production.
Solid CBN Insert Series
For critical precision journals with higher requirements for roundness, surface finish and edge retention. Used as a finishing safeguard for high-standard gear shaft features.
CBN Grooving Insert Series
For relief grooves, sealing grooves and spline grooves. Dedicated groove geometry supports stable entry and exit, helping control burrs, vibration and groove-bottom dimensional variation.
1. Roughing: Resist Interruption
Use an impact-resistant Integral Brazed CBN Insert Series for intermittent features and stock removal before finishing.
2. Finishing: Control Wear
Use a Coated CBN Insert for journal finishing, separating the wear pattern of finishing from roughing loads.
3. Grooving: Use Dedicated Geometry
Use the CBN Grooving Insert Series rather than adapting external-turning inserts to groove features.
Operational Value for Gear Shaft Production
- Improves process stability in interrupted cutting at gear end faces and spline positions.
- Supports more controllable dimensional consistency by separating roughing and finishing functions.
- Reduces groove-related burr, vibration and rework risks through dedicated CBN grooving tooling.
- Helps lower unplanned downtime and scrap exposure caused by abnormal tool failure.
- Provides an adaptable tooling framework for different machines, fixtures, allowances and cycle-time targets.