How to Use TNMG Inserts for Different Materials

News 26 Feb 2025

TNMG (tangential, negative rake, multi-edge) inserts are versatile tools suitable for various machining applications. Here’s how to effectively use TNMG inserts for different materials:

1. Using TNMG Inserts for Steel

Characteristics

Steel is a common material with varying hardness levels.

Recommendations

Insert Grade: Choose a carbide grade with good wear resistance and toughness, such as P-grade inserts.
Cutting Speed: Moderate to high cutting speeds are effective. Adjust based on the specific steel grade.
Feed Rate: Use a medium feed rate to ensure proper chip formation and prevent tool wear.

2. Using TNMG Inserts for Stainless Steel

Characteristics

Stainless steel is tougher and more abrasive than carbon steel.

Recommendations

Insert Grade: Opt for high-performance grades, like K or M grades, designed for high toughness and wear resistance.
Cutting Speed: Keep cutting speeds lower to manage heat and prevent work hardening.
Coolant Use: Employ coolant to reduce temperatures and improve chip removal.

3. Using TNMG Inserts for Aluminum

Characteristics

Aluminum is softer and produces long, stringy chips.

Recommendations

Insert Grade: Use inserts with a sharper edge and a specific geometry for aluminum, often an N-grade.
Cutting Speed: High cutting speeds are suitable due to the material's softness.
Feed Rate: Increase the feed rate to ensure effective chip management and avoid chip clogging.

4. Using TNMG Inserts for Cast Iron

Characteristics

Cast iron is abrasive and produces brittle chips.

Recommendations

Insert Grade: Choose a C-grade insert designed for wear resistance.
Cutting Speed: Moderate cutting speeds help manage chip formation and reduce wear.
Coolant Use: Typically, minimal coolant is needed, but it can help with chip removal and cooling.

When using TNMG inserts, always consider the specific material characteristics and adjust your cutting parameters accordingly. Selecting the right insert grade, adjusting cutting speeds, and managing feed rates will enhance performance and extend tool life across different materials.

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