SUMITOMO WNMA080408 AC4010K (WNMA 432) Super CVD Coated Cast Iron Turning Insert
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SUMITOMO WNMA080408 AC4010K (WNMA 432) Super FF Coat CVD Coated Carbide Cast Iron Machining Turning Insert
1. Product Overview
"Which indexable turning insert grade and heavy-duty flat-top geometry are best suited for high-speed continuous roughing and profiling of highly abrasive gray and ductile cast irons without edge chipping?"
The SUMITOMO WNMA080408 AC4010K (internationally designated in imperial benchmarks as WNMA 432) is a heavy-duty, industrial-grade, double-sided negative 80° trigon indexable turning insert engineered explicitly for high-velocity continuous processing, roughing, and profiling of abrasive cast iron materials (ISO K10 - K20 classification). Utilizing Sumitomo’s breakthrough Super FF Coat (Flawless Fine Coat) CVD Technology, this grade features a highly dense, ultra-smooth alpha-alumina ($\alpha\text{-Al}_2\text{O}_3$) and titanium carbonitride (TiCN) crystalline layer matrix. This specific coating architecture delivers unparalleled thermal barrier properties and extreme flank wear resistance. Combined with a premium high-rigidity tungsten carbide substrate, it prevents sudden edge deformation under massive heat loads. Featuring a specialized Flat-Top (No Chipbreaker) Structure, this insert relies on a naturally high edge-line strength designed to withstand the heavily abrasive, segmented, discontinuous chip formations typical of cast iron, yielding maximum security during high surface-footage cycles.
2. Product Key Features
- Super FF Coat CVD Layering: Implements an ultra-smooth, multi-layered crystal-oriented CVD coating that drastically lowers friction between the tool and abrasive cast iron dust, preventing premature cratering.
- Heavy-Duty Flat-Top Geometry: Devoid of delicate chipbreaker walls, the solid flat-top face maximizes structural cross-sectional thickness at the cutting edge, effectively neutralizing severe mechanical impacts.
- High-Density K-Class Carbide Substrate: Specially optimized matrix containing enriched carbide structures that offer high plastic deformation resistance and pocket seating stability during high-speed machining.
- 6 Economical Cutting Corners: The negative 80-degree structural trigon layout provides 6 distinct cutting edges per insert, delivering elite processing economy and lowering shop-floor tool costs.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Specification (ANSI) |
|---|---|---|
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Corner Nose Radius (re) | 0.8 mm | 0.0315 in (2/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150 in |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) / Depth of Cut (ap) |
|---|---|---|
| Gray Cast Iron (FC250 / Class 35) | 200 - 450 m/min (650 - 1470 SFM) | 0.15 - 0.45 mm/rev (0.006 - 0.018 ipr) ap: 0.5 - 3.5 mm (0.020 - 0.138 in) |
| Ductile/Nodular Cast Iron (FCD450 / 65-45-12) | 150 - 350 m/min (490 - 1150 SFM) | 0.15 - 0.40 mm/rev (0.006 - 0.016 ipr) ap: 0.5 - 3.0 mm (0.020 - 0.118 in) |
This WNMA0804 / WNMA432 indexable matrix requires standard external or internal negative turning toolholders utilizing rigid top-clamp or lever-lock mechanisms.
Browse Matching MWLNR/L, DWLNR/L & WWLNR/L Toolholders →4. Product Application Scenarios
The AC4010K high-speed CVD cast iron grade offers elite tool safety and wear performance across specific industrial components:
5. Toolholder & Equipment Compatibility
Strictly compliant with indexable geometric standard pocket seating, this CVD coated insert integrates natively into global standard hardware setups:
- External Shank Holders: MWLNR2020K08, MWLNR2525M08, DWLNR2525M08, WWLNR2525M08 (Metric) / MWLNR16-4B, DWLNR16-4B (Imperial).
- Internal Boring Bars: A32S-MWLNR08, A40T-MWLNR08 (Minimum bore clearance diameter >= 40mm / 1.57").
- Lathe Integration: Optimized for modern, rigid CNC turning centers (Mazak, DMG Mori, Okuma, Haas). Given the dry, dusty nature of cast iron machining, high-rigidity setups with proper chip/dust evacuation systems are highly recommended.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Structure |
|---|---|---|---|
| SUMITOMO | AC4010K (Target) | ISO K05 - K15 / Ultra High-Speed Cast Iron Continuous Machining | Super FF Coat CVD (Thick Smooth $\alpha\text{-Al}_2\text{O}_3$ + TiCN) |
| Sandvik Coromant | GC3210 / GC3205 | ISO K10 / Cast Iron Turning | Inveio CVD coating technology (highly textured Al2O3) |
| Kennametal | KCK05 / KC9210 | ISO K05 - K15 / Cast Iron Machining | Thick CVD Al2O3 layer over high-hardness K-class substrate |
| Kyocera | CA310 / CA315 | ISO K10 / Gray and Nodular Iron Turning | CVD coated crystalline Al2O3 structure with high adhesion resistance |
7. Why Choose Us & Verified Global Performance Evaluations
Proven high-velocity machining results showing maximum structural edge retention and crater wear control:
"We run these WNMA 432 inserts on Class 40 gray iron brake housings at 1200 SFM. The flat-top design is bulletproof. Unlike standard inserts that chip out due to sand inclusions, the AC4010K edge just keeps cutting. Flank wear is incredibly uniform."
"Hervorragende Standzeit bei Gusseisen mit Lamellengraphit (GG25). Die Super FF Beschichtung reduziert die Reibung drastisch. Wir konnten unsere Schnittgeschwindigkeit um 30% erhöhen, ohne Einbußen bei der Prozesssicherheit. Absolut professionelles Werkzeug."
"Utilizzato per la tornitura di volani in ghisa sferoidale. Inserto robustissimo grazie alla geometria piana senza rompitruciolo. Ottima stabilità del tagliente alle alte temperature di taglio."
"自動車用ブレーキディスクの高速荒〜中仕上げ加工に導入。AC4010Kの耐摩耗性は圧倒的で、他社グレードで発生していた急激な逃げ面摩耗が完全に抑制されました。平面形状（フラットトップ）の刃先強度が非常に高く、安心して無人化運転を回せます。"
8. Technical Machining FAQ
Q: Why does the WNMA080408 have a completely flat top face without a chipbreaker groove?
A: Cast iron produces short, brittle, segmented chips that naturally break without the aid of a molded chipbreaker pocket. By designing the insert with a flat top (WNMA type), the edge retains maximum cross-sectional mass and cutting-line strength, protecting the insert against the highly abrasive shearing impacts typical of cast iron machining.
Q: Can the AC4010K grade handle interrupted cuts or cast iron skins with heavy sand inclusions?
A: AC4010K is an ultra-hard CVD grade optimized for high-speed continuous machining (ISO K05 - K15). While the flat-top geometry provides excellent edge strength, heavy structural interruptions or severe scaling may cause micro-chipping in such a hard grade. For heavily interrupted cutting, we recommend stepping down to a tougher grade like Sumitomo AC4015K or AC4025K.
Q: Should I use coolant when turning cast iron with this insert?
A: Dry machining is generally preferred for turning cast iron, as the graphite within the material acts as a natural solid lubricant, and dry environments eliminate thermal shock risks along the cutting edge. Additionally, running dry prevents the formation of abrasive slurry with cast iron dust. If coolant is mandatory for machine thermal stability, ensure high-pressure flood delivery focused directly on the cutting zone.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain covers ISO K05 to K20 parameters. Explicitly engineered for high-velocity continuous machining of gray cast iron (e.g., FC200, FC250, FC300) and highly stable ductile iron profiling (e.g., FCD450, FCD500) under rigid workholding configurations.
Machining Troubleshooting Guide: If sudden edge chipping or micro-fracturing occurs, reduce the cutting speed ($v_c$) or check for workpiece clamping deflection. If the flank wear is progressing too rapidly under continuous passes, check that you are running within the high-speed target window ($> 200\text{ m/min}$) to fully leverage the thermal protection of the Super FF alumina layer.
Authorized Reference Documentation & Endorsements: Dimensional configurations, pocket seating tolerances, and naming structures fully comply with the international ISO 1832:2017 industrial standards blueprint. Mechanical strength thresholds, thermal crack criteria, and wear tolerances are cross-referenced from verified test catalogs published by Sumitomo Electric Hardmetal Corp.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.