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WIDIA CBN NEGATIVE

WIDIA, a brand with origins tracing back to the early 20th century, is recognized globally for its expertise in carbide tooling and cutting inserts. The WIDIA CBN NEGATIVE product line focuses on indexable turning inserts that utilize cubic boron nitride (CBN) as the cutting material. CBN is a superabrasive material second only to diamond in hardness, making these inserts suitable for machining hardened steels, cast irons, and other ferrous materials where conventional carbide tools wear rapidly. The negative geometry of these inserts refers to the rake angle, which is negative, providing increased edge strength and allowing for higher cutting forces, which is beneficial in interrupted cuts and heavy roughing operations. The product family includes a variety of insert shapes—diamond (DNGA, VNGA), square (SNGA), and triangle (TNGA)—each available in multiple sizes and edge preparations. For example, the DNGA432EMT and DNGA433EMT variants feature a medium edge hone, while the S0425MT and S01025MT designations indicate specific chipbreaker geometries and edge treatments optimized for different material groups and cutting conditions. These inserts are typically used in turning operations on CNC lathes and machining centers, where they deliver consistent tool life and surface finish. 3G Electric supplies these WIDIA CBN NEGATIVE inserts as part of its industrial cutting tool inventory, supporting procurement specialists and plant engineers who require reliable, specification-compliant tooling for high-volume or precision machining. The inserts are available in standard ISO geometries, ensuring compatibility with common tool holders. 3G Electric provides logistics support for global shipments, enabling customers to source these specialized inserts without navigating multiple suppliers. The product range covers common sizes such as VNGA160404, TNGA160408, and SNGA120408, which correspond to inch and metric designations, allowing for direct replacement in existing tooling setups. For maintenance managers and process engineers, the availability of multiple edge preparations and chipbreaker styles means that the inserts can be selected to match specific workpiece materials and surface finish requirements, reducing trial-and-error in tool selection.

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About WIDIA CBN NEGATIVE

WIDIA, a brand with origins tracing back to the early 20th century, is recognized globally for its expertise in carbide tooling and cutting inserts. The WIDIA CBN NEGATIVE product line focuses on indexable turning inserts that utilize cubic boron nitride (CBN) as the cutting material. CBN is a superabrasive material second only to diamond in hardness, making these inserts suitable for machining hardened steels, cast irons, and other ferrous materials where conventional carbide tools wear rapidly. The negative geometry of these inserts refers to the rake angle, which is negative, providing increased edge strength and allowing for higher cutting forces, which is beneficial in interrupted cuts and heavy roughing operations. The product family includes a variety of insert shapes—diamond (DNGA, VNGA), square (SNGA), and triangle (TNGA)—each available in multiple sizes and edge preparations. For example, the DNGA432EMT and DNGA433EMT variants feature a medium edge hone, while the S0425MT and S01025MT designations indicate specific chipbreaker geometries and edge treatments optimized for different material groups and cutting conditions. These inserts are typically used in turning operations on CNC lathes and machining centers, where they deliver consistent tool life and surface finish. 3G Electric supplies these WIDIA CBN NEGATIVE inserts as part of its industrial cutting tool inventory, supporting procurement specialists and plant engineers who require reliable, specification-compliant tooling for high-volume or precision machining. The inserts are available in standard ISO geometries, ensuring compatibility with common tool holders. 3G Electric provides logistics support for global shipments, enabling customers to source these specialized inserts without navigating multiple suppliers. The product range covers common sizes such as VNGA160404, TNGA160408, and SNGA120408, which correspond to inch and metric designations, allowing for direct replacement in existing tooling setups. For maintenance managers and process engineers, the availability of multiple edge preparations and chipbreaker styles means that the inserts can be selected to match specific workpiece materials and surface finish requirements, reducing trial-and-error in tool selection.

Common Applications

  • Hard turning of bearing races — WIDIA CBN NEGATIVE DNGA432EMT inserts for finishing hardened steel rings.
  • Machining of die and mold components — WIDIA CBN NEGATIVE TNGA332S0425MT inserts for roughing tool steels.
  • High-volume production of automotive gears — WIDIA CBN NEGATIVE SNGA432S0425MT inserts for turning case-hardened steels.
  • Interrupted cut turning of cast iron brake drums — WIDIA CBN NEGATIVE VNGA331S0425MT inserts for heavy roughing.
  • Finishing of powder metal sprockets — WIDIA CBN NEGATIVE DNGA150408S01025MT inserts for surface finish requirements.
  • Profiling of hardened steel shafts — WIDIA CBN NEGATIVE TNGA160408S01025MT inserts for contour turning.

Frequently asked questions

Common questions about WIDIA CBN NEGATIVE from 3G Electric.

What does the 'CBN NEGATIVE' designation mean in WIDIA inserts?

CBN stands for cubic boron nitride, a superabrasive material used for machining hard ferrous materials. 'Negative' refers to the insert's rake angle, which is negative (typically -5° to -7°). This geometry provides a stronger cutting edge, making the insert suitable for interrupted cuts, heavy roughing, and machining of hardened steels above 45 HRC. The negative rake also allows the insert to be used in both left-hand and right-hand tool holders, increasing versatility.

What insert shapes are available in the WIDIA CBN NEGATIVE line?

The WIDIA CBN NEGATIVE line includes diamond (DNGA and VNGA), square (SNGA), and triangle (TNGA) shapes. Diamond inserts (80° included angle) are common for turning and facing operations. Square inserts (90° included angle) offer four cutting edges and are used for general turning. Triangle inserts (60° included angle) provide three cutting edges and are often used for profiling and finishing. Each shape is available in multiple sizes, such as DNGA432, VNGA331, SNGA432, and TNGA332.

How do I interpret the part numbers like DNGA432EMT or SNGA432S0425MT?

These part numbers follow ISO coding for indexable inserts. For example, DNGA432EMT: 'D' indicates diamond shape, 'N' indicates negative clearance angle, 'G' indicates tolerance class, 'A' indicates chipbreaker style, '432' indicates insert size (e.g., 4 = inscribed circle diameter, 32 = thickness and corner radius). 'EMT' indicates edge preparation (E = medium edge hone, MT = medium chipbreaker). In SNGA432S0425MT, 'S' indicates square shape, '0425' indicates a specific edge hone radius (0.025 inch). Always refer to the manufacturer's catalog for exact specifications.

What materials are WIDIA CBN NEGATIVE inserts designed to machine?

These inserts are optimized for machining hardened steels (45-65 HRC), tool steels, die steels, and cast irons (gray, ductile, and alloyed). They are also effective for high-speed machining of powder metal parts and certain superalloys. CBN is not recommended for machining soft steels or non-ferrous materials like aluminum, as chemical wear can occur. For best results, use these inserts with rigid setups and appropriate coolant application.

Can WIDIA CBN NEGATIVE inserts be used for both roughing and finishing?

Yes, but the specific edge preparation and chipbreaker geometry determine suitability. Inserts with a stronger edge hone (e.g., S0425MT) are better for roughing and interrupted cuts, while those with a lighter edge (e.g., S01025MT) are suited for finishing. The negative rake provides edge strength for roughing, but for fine finishing, a positive rake insert may be preferred. Always match the insert grade and geometry to the specific operation and material.

Does 3G Electric supply WIDIA CBN NEGATIVE products?

Yes — 3G Electric (S) Pte. Ltd. supplies WIDIA CBN NEGATIVE products. We stock the WIDIA CBN NEGATIVE catalog and supply genuine factory-original products with full manufacturer warranty and technical support.