Kyocera DCMT070202HQ CA125P TMK00369

1. Product Overview

The DCMT070202HQ is a premium-grade indexable carbide insert from Kyocera Corporation, manufactured in Japan. Coated with the advanced CA125P PVD TiAlN multi-layer coating, this v-insert is engineered for fine finishing, light cutting, high-precision cylindrical turning, profile machining. It delivers exceptional surface finish, dimensional accuracy, and extended tool life across high-volume production environments.

Key benefits of the DCMT070202HQ include optimized chip control through the HQ chipbreaker geometry, reduced cutting forces for improved workpiece surface integrity, and excellent heat resistance for stable performance at elevated speeds. This insert is the preferred choice for precision manufacturing in aerospace, automotive, energy, and general engineering sectors.

2. ISO Designation Breakdown

The model code DCMT070202HQ follows the ISO 1832:2004 standard for indexable inserts. Each position in the designation conveys critical geometric and functional data:

3. Engineering Dimensions & Geometry

All dimensions are manufactured to ISO 1832 tolerances and verified by automated CMM inspection. The following table provides the complete dimensional specification for the DCMT070202HQ:

4. Grade Details – Key Grade Characteristics

The CA125P grade is a PVD-coated ultra-fine grain carbide developed specifically for steel and stainless steel machining. Its multi-layer TiAlN + TiN coating provides outstanding wear resistance, thermal stability, and low friction.

• Substrate: Ultra-fine grain tungsten carbide (WC-Co) with 12% cobalt binder
• Coating: Multi-layer PVD TiAlN + TiN duplex coating, 3-5 μm total thickness
• Hardness: 1,520 HV (92 HRA) – optimized for steel machining
• Transverse Rupture Strength: 3,200 N/mm² – high toughness for interrupted cuts
• Oxidation Resistance: Up to 900°C – stable at high cutting speeds
• Friction Coefficient: 0.35 – reduced built-up edge on ferrous materials
• Color Code: Bronze-gold PVD finish – easy visual identification

5. Grade Comparison Matrix

Selecting the correct grade is essential for maximizing productivity and tool life. The table below compares CA125P with adjacent grades in the Kyocera portfolio:

6. Chipbreaker Profile

The HQ chipbreaker is engineered for high-precision finishing operations. It features a finely ground positive rake surface with a narrow land width (0.1-0.2 mm) and a shallow groove depth (0.05-0.08 mm) designed to curl and break chips at very low feed rates.

7. Recommended Applications & Workpiece Materials

The DCMT070202HQ with CA125P grade is optimized for the following material groups and machining scenarios:

• Carbon Steels (C15, C45, C60): Excellent chip control and surface finish. Recommended for continuous and lightly interrupted cuts.
• Alloy Steels (4140, 4340, 16MnCr5): Balanced wear resistance and toughness. Suitable for medium to high cutting speeds.
• Bearing Steels (100Cr6, 52100): High hardness machining with consistent dimensional accuracy.
• Tool Steels (H13, D2, O1): Pre-hardened material machining at reduced speeds with good edge stability.
• Stainless Steels (304, 316, 420): Reduced built-up edge tendency due to low-friction PVD coating.
• Cast Irons (GG25, GGG40): Effective for skin machining and general turning of nodular cast iron.

8. Application Map by Operation

The following matrix rates the DCMT070202HQ suitability across common CNC turning operations. Ratings are based on chipbreaker geometry, insert strength, and typical cutting forces:

9. Recommended Cutting Conditions

Cutting parameters should be selected based on workpiece material, machine rigidity, and desired surface finish. The following table provides starting recommendations for the DCMT070202HQ:

Note: Values are starting recommendations. Adjust based on machine rigidity, coolant delivery, and workpiece condition. Use lower end for interrupted cuts or scale formation.

10. Operating Guidelines

To achieve maximum performance and tool life from the DCMT070202HQ, adhere to the following operational best practices:

• Coolant: High-pressure coolant (70+ bar) is strongly recommended for steel machining to extend tool life and improve chip evacuation. Use water-soluble oil at 8-10% concentration.
• Tool Overhang: Minimize tool overhang to 1.5× insert IC maximum to prevent vibration and chatter during finishing.
• Entry Angle: Maintain a 93° tool entry angle for cylindrical turning; 45°-75° for facing operations.
• Edge Preparation: This insert comes with a honed T-land (0.02-0.05 mm × 20°) to prevent chipping on entry. Do not re-sharpen.
• Chip Control: Ensure chipbreaker groove is aligned with feed direction. Improper seating can cause chip packing and insert fracture.
• Storage: Store in original packaging at <30°C and <60% RH. Avoid direct contact with other carbide tools to prevent edge damage.
• Index Frequency: For finishing (HQ), index every 30-60 min; for roughing (XQ), index every 15-30 min or when flank wear exceeds 0.15 mm.

11. Toolholder Compatibility

The DCMT070202HQ is compatible with the following standard ISO toolholders and clamp systems. Ensure correct seat angle and clamp type for secure insert retention:

12. Packaging & Ordering Information

13. Catalog Meta Data

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