Description
CARBIDE TURNING INSERTS CNMM
CNMM carbide turning inserts are single-sided, negative-geometry turning tools featuring an 80° diamond (rhomboid) shape with a 0° relief (clearance) angle. These inserts are designed for heavy-duty and roughing applications, but can also be used for semi-finishing and finishing under less demanding conditions. Made from cemented carbide (WC-Co) and coated (CVD or PVD, depending on grade), CNMM inserts provide durability, stability, and good performance, especially in aggressive cuts or challenging materials.
Key Features:
• Shape: 80° diamond (rhomboid)
• Relief Angle: 0° (negative geometry)
• Cutting Edges: Single-sided – 2 cutting edges per insert
• Mounting Type: Clamp or screw-on
• Coatings: CVD, PVD, TiN, TiCN, Al₂O₃ (depending on grade)
• Application Type: Heavy roughing, semi-finishing, and general turning
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Materials & Applications
CNMM carbide inserts are utilized in applications requiring strong, frequent cuts, challenging materials, and high stability.
Typical Workpiece Materials:
• Steel (carbon, alloy) — heavy cuts, general machining, roughing.
• Stainless Steel — when using appropriate grades and coatings to minimize issues like built-up edge (BUE), heat, etc.
• Cast Iron — gray and ductile cast iron, benefits from suitable chipbreakers and robustness; CNMM performs well with these materials.
• Titanium / Superalloys — some versions can be used, but more for light finishing applications under controlled conditions, due to high temperature and wear demands.
Common Operations:
• Heavy roughing (deep cuts)
• Semi-finishing (when tolerance and finish are required)
• Finishing under less aggressive conditions, if grade and geometry permit
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Advantages & Performance
• High strength and stability: Negative geometry and thicker insert design allow for aggressive cuts and resistance to vibrations and mechanical stresses.
• Durability: Modern coatings and quality substrates make CNMM inserts resistant to wear and high temperatures.
• Versatility: Wide range of chipbreakers and grades allow adaptation to different materials and working conditions.
• Cost-efficiency: While the price may be higher for coated and superior grades, inserts offer long life and good performance in demanding applications.
