Industry Knowledge & Technical Overview
1. Basic Introduction
Cubic Boron Nitride Insert (CBN Insert) is a superhard cutting tool made from synthetic CBN powder sintered under high pressure and high temperature (HPHT). It is widely used in high-speed machining, hard turning, and precision cutting of difficult-to-process materials.
2. Development History of CBN Inserts
| Period | Key Milestones |
|---|---|
| 1957 | First synthetic CBN crystal successfully developed by GE |
| 1970s–1980s | PCBN composite technology realized; early CBN inserts applied in industry |
| 1990s | Coated CBN inserts launched; "turning instead of grinding" widely adopted |
| 2000s–2010s | Grain refinement, gradient structure, high-content CBN matured |
| 2020s – Present | Binderless CBN, smart tools, high-end domestic manufacturing rapidly developed |
3. Core Performance Advantages
| Property | Performance |
|---|---|
| Hardness | HV3000–4500, second only to diamond |
| Thermal Stability | Stable at up to 1200–1400°C |
| Wear Resistance | 20–50 times that of carbide inserts |
| Chemical Stability | No reaction with ferrous metals at high temperature |
| Machining Accuracy | High precision, good surface finish |
4. Current Technical Status
Today's CBN insert technology has entered a stage of high performance, intelligence, and customization.
① Material Technology
High-purity CBN powder (purity ≥ 99.9%)
Binderless CBN (nearly 100% CBN content)
Gradient composite structure for high hardness & high toughness
② Manufacturing Technology
Precision HPHT sintering
Laser & EDM machining
CNC grinding for micron-level edge quality
Intelligent online detection
③ Product Classification
| CBN Content | Application |
|---|---|
| 40%–60% | Rough machining |
| 60%–85% | Semi-finishing |
| 85%–95% | High-speed finishing |
| Binderless | Super-precision & difficult alloys |
5. Main Applications
Automotive parts: hardened steel gears, bearings, crankshafts, camshafts
Mold & die: hardened mold steels, rolls, cylinders
Aerospace: high-temperature alloys, titanium alloys
Engineering machinery: high-hardness parts, precision valves
Energy equipment: wind power, nuclear power, rail components
6. Industry Trends
High-end, high-content CBN becomes mainstream
Binderless CBN and nano-structured CBN grow rapidly
Intelligent tools with real-time monitoring
Strong domestic substitution in China's high-end tool market
Customized solutions for special materials and processes
