PCBN (Polycrystalline Cubic Boron Nitride) is a superhard material with hardness second only to diamond. It is sintered from CBN micron powder and metal or ceramic binders under high temperature and high pressure. Hardness typically ranges from HV 2500 to 5000. It is often composited with cemented carbide to increase strength, enabling efficient processing.

PCBN tools are used for the machining of hard ferrous metals to improve efficiency, precision, and stability while reducing comprehensive costs. PCBN tools are also suitable for automated production lines and dry cutting applications.

PCBN is a primary material for difficult-to-machine materials. Application areas include: hardened steel, cast iron, high-temperature alloys, and powder metallurgy.

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• Hardness and Wear Resistance: PCBN hardness is higher than cemented carbide and ceramic tools. It resists cutting wear of hard materials such as hardened steel (above HRC 60) and chilled cast iron. Tool life is 5 to 15 times that of cemented carbide tools, reducing tool change frequency and production costs.
• Thermal Stability: Heat resistance reaches 1400-1500°C. Performance remains stable in high-temperature cutting environments, supporting dry cutting and high-speed cutting. This reduces cutting fluid usage and environmental impact.
• Chemical Inertness: No chemical reaction occurs with ferrous materials at 1200-1300°C. This prevents bonding and diffusion between the tool and workpiece, ensuring processing accuracy and surface quality in ferrous metal machining.
• Friction Coefficient: The friction coefficient is 0.1-0.3. Cutting forces and temperatures are lower compared to cemented carbide, reducing tool-chip sticking while increasing processing efficiency.
• Thermal Conductivity: High thermal conductivity allows for rapid dissipation of cutting heat. This reduces thermal deformation and improves dimensional accuracy for heat-sensitive materials.
• Processing Adaptability: Suitable for roughing, semi-finishing, and finishing operations. The hard turning process increases efficiency by 3 to 10 times compared to grinding. Applications include the automotive, aerospace, and mold industries.
• Edge Retention: The cutting edge maintains its initial geometry during operation. This ensures processing consistency for automated production and high-precision requirements.