Kyocera GMM3020MT KW10 Grade Uncoated Carbide, Indexable Grooving Insert

Product Overview

The Kyocera GMM3020-MT is a precision-engineered KW10 grade uncoated carbide indexable insert designed for external deep grooving operations. Manufactured by Kyocera Precision Tools in Japan, this grooving insert delivers exceptional dimensional accuracy, superior surface finish, and extended tool life in demanding CNC machining environments. The GMM3020-MT features 2 usable cutting edge(s) and is compatible with standard ISO toolholders for seamless integration into existing production workflows.

Ideal for manufacturers seeking high-performance tooling solutions, the GMM3020-MT combines a premium micro-grain carbide substrate with an optimized edge preparation that minimizes built-up edge and ensures consistent chip evacuation across a wide range of workpiece materials.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Precision manufacturing ensures tight dimensional tolerances and consistent repeatability across batch production. The following specifications define the physical geometry of the GMM3020-MT insert:

All dimensions are manufactured to ISO 1832 tolerances with C-class accuracy for reliable tool life prediction and consistent part quality.

Grade Details – Key Grade Characteristics

KW10 is a premium uncoated micro-grain carbide grade from Kyocera Precision Tools, engineered specifically for machining non-ferrous & cast iron. The grade composition features:

• Substrate: Ultra-fine tungsten carbide grain structure (sub-micron) for high hardness and excellent edge retention
• Coating: Uncoated (bare carbide) for maximum edge sharpness and minimal friction in non-ferrous applications
• Binder: Optimized cobalt content providing balanced toughness and wear resistance
• Hardness: Approximately 92.0 HRA, suitable for high-speed machining of softer materials
• Transverse Rupture Strength: High TRS for stable performance in interrupted cuts

The uncoated surface finish of KW10 minimizes material adhesion and built-up edge when machining aluminum, copper, and titanium alloys, delivering mirror-quality surface finishes without the risk of coating delamination.

Grade Comparison Matrix

KW10 is the optimal choice when machining non-ferrous & cast iron where coating adhesion is not required and maximum edge sharpness is preferred.

Chipbreaker Profile

Sharp-cutting MT chipbreaker designed for deep grooving and cut-off operations. Provides excellent chip control in narrow grooves and minimizes cutting forces for stable machining.

Recommended Applications & Workpiece Materials

The GMM3020-MT in KW10 grade is specifically formulated for stable cutting of the following material groups:

• Cast Iron: Gray cast iron (GG/GGL), nodular cast iron (GGG) – excellent wear resistance and thermal stability
• Non-Ferrous Metals: Aluminum alloys (6061, 7075, 2024), copper, brass, bronze – prevents built-up edge and ensures mirror finish
• Titanium Alloys: Ti-6Al-4V and commercially pure titanium – low chemical affinity reduces diffusion wear
• Non-Metals: Engineering plastics, composites, and graphite – sharp edge prevents delamination and fiber pull-out

Not recommended for: Hardened steels (>45 HRC), high-temperature nickel alloys, or stainless steels requiring coated grades for crater wear resistance.

Application Map by Operation

Recommended Cutting Conditions

The following parameters serve as starting points for stable machining. Adjustments should be made based on machine rigidity, workpiece material condition, and coolant delivery:

Note: For aluminum and copper alloys, higher cutting speeds up to 200 m/min may be achievable with stable setups and efficient chip evacuation. For titanium alloys, reduce Vc to the lower end of the range and ensure generous coolant flow to prevent heat buildup.

Operating Guidelines

• Tool Setup: Ensure insert seat is clean and free of chips before seating. Use proper torque when clamping to avoid micro-cracking of the carbide substrate.
• Run-In Period: For the first 2–3 minutes of operation, reduce feed rate by 20% to allow the cutting edge to stabilize and develop a natural wear land.
• Chip Management: Verify chip breaker performance visually. Long, stringy chips indicate insufficient feed or incorrect coolant delivery. Adjust parameters accordingly.
• Edge Inspection: Inspect cutting edges under magnification after each shift. Look for uniform flank wear (VB max 0.3 mm) as the primary index change criterion. Avoid using inserts with chipping or thermal cracking.
• Coolant Delivery: Direct coolant nozzle to the cutting zone at high pressure (minimum 10 bar for deep grooving). For aluminum, consider through-tool coolant if available.
• Storage: Store inserts in original packaging away from moisture and corrosive atmospheres. Handle with gloves to prevent corrosion from skin oils.

Toolholder Compatibility

The GMM3020-MT is designed for use with KGM series external grooving and cut-off holders with GMM insert seat. Compatible holder families include:

• KGMH, KGMG series grooving holders
• Standard ISO shank sizes: 16×16 mm, 20×20 mm, 25×25 mm (select based on machine turret and overhang requirements)
• Insert clamping: Lever-lock or top-clamp systems (holder-dependent)
• Coolant capability: External and through-tool coolant compatible

Always verify insert seat geometry and clamping mechanism compatibility before ordering toolholders. Contact Kyocera technical support for application-specific holder recommendations.

Packaging & Ordering Information

For bulk orders, technical documentation, and material certification requests, contact our CNC tooling specialists. Genuine OEM inserts ensure full manufacturer warranty coverage and consistent batch-to-batch performance.

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