In mechanical machining, the selection of turning inserts significantly impacts machining efficiency, workpiece quality, and tool life. Different machining materials and conditions require different types of turning inserts. This article provides a detailed introduction to several common turning insert models and their applicable scenarios.

1. CNMG Series

• Model Characteristics: CNMG inserts are common negative rake angle inserts with four cutting edges, offering high cost-effectiveness.

• Applicable Scenarios: Suitable for roughing and semi-finishing, commonly used for machining steel, stainless steel, and cast iron.

• Advantages: High insert strength, suitable for heavy cutting.

• Disadvantages: High cutting force, not suitable for finishing.
  

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2. DNMG Series

• Model Characteristics: DNMG inserts are negative rake angle inserts with two cutting edges and a 55-degree tip angle.

• Applicable Scenarios: Suitable for finishing and semi-finishing, commonly used for machining steel, stainless steel, and cast iron.

• Advantages: High tip strength, suitable for high-precision machining.

• Disadvantages: Fewer cutting edges, lower cost-effectiveness.
  

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3. TNMG Series

• Model Characteristics: TNMG inserts are positive rake angle inserts with three cutting edges and a 60-degree tip angle.

• Applicable Scenarios: Suitable for finishing and semi-finishing, commonly used for machining steel, stainless steel, and cast iron.

• Advantages: Low cutting force, suitable for high-precision machining.

• Disadvantages: Lower insert strength, not suitable for heavy cutting.
  

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4. WNMG Series

• Model Characteristics: WNMG inserts are negative rake angle inserts with six cutting edges and an 80-degree tip angle.

• Applicable Scenarios: Suitable for roughing and semi-finishing, commonly used for machining steel, stainless steel, and cast iron.

• Advantages: Multiple cutting edges, high cost-effectiveness.

• Disadvantages: Lower tip strength, not suitable for high-precision machining.
  

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5. CCMT Series

• Model Characteristics: CCMT inserts are positive rake angle inserts with two cutting edges and an 80-degree tip angle.

• Applicable Scenarios: Suitable for finishing and semi-finishing, commonly used for machining steel, stainless steel, and cast iron.

• Advantages: Low cutting force, suitable for high-precision machining.

• Disadvantages: Lower insert strength, not suitable for heavy cutting.
  

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6. VBMT Series

• Model Characteristics: VBMT inserts are positive rake angle inserts with two cutting edges and a 35-degree tip angle.

• Applicable Scenarios: Suitable for finishing and super-finishing, commonly used for machining steel, stainless steel, and cast iron.

• Advantages: Low cutting force, suitable for high-precision machining.

• Disadvantages: Lower insert strength, not suitable for heavy cutting.

Choosing the right turning insert depends on the machining material, conditions, and requirements. Roughing and semi-finishing typically require negative rake angle inserts, such as CNMG and WNMG, while finishing and super-finishing are better suited for positive rake angle inserts, such as TNMG and VBMT. By selecting the appropriate turning insert, you can improve machining efficiency, ensure workpiece quality, and extend tool life.