Kyocera CNMG120416KH CA320 TME01022

Product Overview

The CNMG120416KH CA320 (TME01022) is a premium-grade indexable carbide insert manufactured by Kyocera in Japan. Designed for heavy roughing operations, this roughing insert combines an ultra-fine grain carbide substrate with a multi-layer CVD coating to deliver exceptional wear resistance, thermal stability, and chip control.

With its 80° rhombic (diamond) geometry, 12.70 mm inscribed circle, and 1.60 mm nose radius, the CNMG120416KH is optimized for steel, stainless steel, cast iron machining. The heavy roughing (k-type) profile ensures reliable chip evacuation across a broad spectrum of cutting parameters, reducing downtime and improving surface integrity.

ISO Designation Breakdown

The CNMG120416KH designation follows ISO 1832 standard nomenclature for indexable inserts:

Engineering Dimensions & Geometry

All dimensions conform to ISO 1832:2017 tolerances. Measurements are nominal values at 20°C.

Grade Details – Key Grade Characteristics

The CA320 grade is a CVD-coated ultra-fine grain carbide engineered for medium to high-speed turning of ferrous materials. The coating architecture provides a thermal barrier and chemical stability at elevated temperatures.

Grade Comparison Matrix

Select the optimal grade based on your specific machining requirements:

Chipbreaker Profile

The KH-type chipbreaker features an aggressive groove geometry designed for heavy roughing operations. The wide, deep chip pocket accommodates large chip volumes while the reinforced cutting edge withstands high mechanical loads. Key characteristics include:

• Wide chip groove (0.8mm depth) for efficient chip evacuation
• Reinforced cutting edge with negative land (0.15mm x 15°)
• Optimized for depths of cut 2.0–8.0 mm
• Excellent chip control at feed rates 0.25–0.60 mm/rev
• Designed for interrupted cuts and scale-covered surfaces

Recommended Applications & Workpiece Materials

The CNMG120416KH CA320 is primarily recommended for the following material groups:

• Carbon & Alloy Steels: Excellent performance from annealed to quenched & tempered conditions (up to 35 HRC)
• Stainless Steels: Austenitic (304, 316) and ferritic grades; avoid work-hardening by maintaining consistent feed
• Cast Irons: Gray cast iron (GG20–GG30) and nodular cast iron (GGG40–GGG60) with or without chill layers
• Tool Steels: Pre-hardened tool steels (H13, D2, O1) in soft-annealed or pre-hardened state
• Structural Steels: S235, S355, and similar construction steels with scale or rust

Not Recommended For: Titanium alloys, nickel-based superalloys (Inconel), hardened steels >45 HRC, or non-ferrous metals (aluminum, copper) without specialized geometry modifications.

Application Map by Operation

Suitability rating for common turning operations (★★★★★ = Optimal):

Recommended Cutting Conditions

Parameters are starting recommendations. Optimize based on machine rigidity, workpiece condition, and required surface finish. Use coolant for steels and stainless; dry or mist for cast iron.

Note: Reduce cutting speed by 20–30% for interrupted cuts, cast surfaces with scale, or when using long overhang toolholders. Increase speed by 10–15% for stable, continuous cuts on pre-machined surfaces.

Operating Guidelines

• Entry Angle: Use 45°–75° entering angle for optimal chip control and minimal notch wear
• Lead Angle: Maintain 5°–15° lead angle to distribute cutting force and improve surface finish
• Coolant: High-pressure coolant (70–100 bar) recommended for stainless steel and exotic alloys; dry cutting acceptable for cast iron
• Speed Ramp: Reduce cutting speed by 15% for initial passes on forged or cast surfaces with scale/oxidation
• Depth Progression: For heavy roughing, use progressive depth increments: 50% → 75% → 100% of target DOC
• Tool Overhang: Keep toolholder overhang to minimum (≤4× holder diameter) to prevent vibration
• Edge Preparation: KH-type chipbreaker requires no additional edge honing for standard applications
• Insert Change: Monitor flank wear (VBmax = 0.3 mm for roughing, 0.15 mm for finishing). Replace before catastrophic failure
• Workpiece Rigidity: Ensure minimum L/D ratio of 4:1 for unsupported workpieces; use steady rests for slender shafts
• Chip Management: Verify chip curl and break pattern within first 10 passes; adjust feed if continuous chips form

Toolholder Compatibility

The CNMG120416KH is compatible with standard ISO toolholders designed for 80° rhombic (diamond) inserts with 0° (neutral) clearance:

• Recommended Toolholders: PCLNR/L, PCKNR/L, CCLNR/L (80° diamond, 7°–11° clearance)
• Clamping System: Lever-lock or screw-clamp mechanisms with top clamp or through-hole clamping
• Seat Angle: Match toolholder seat angle to insert clearance angle (0° (Neutral))
• Insert Pocket: Ensure pocket is clean and free of chip debris before insert seating
• Torque Spec: Clamp screw torque 2.5–3.5 N·m (do not overtighten to avoid insert fracture)
• Replacement: Use original Kyocera clamping components for guaranteed retention force

Packaging & Ordering Information

Catalog Meta Data