SUMITOMO WNMG080404N-EX AC520U (WNMG 431-EX) Superalloy Carbide Turning Insert
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SUMITOMO WNMG080404N-EX AC520U (WNMG 431-EX) Super-PVD Carbide HRSA & Titanium Interrupted Turning Insert
1. Product Overview
"Which indexable carbide insert grade and roughing chipbreaker geometry offer the highest resistance to boundary notch wear and plastic deformation during high-load interrupted turning of Inconel, Titanium alloys, and heat-resistant superalloys?"
The SUMITOMO WNMG080404N-EX AC520U (internationally designated in imperial benchmarks as WNMG 431-EX) is an industrial-grade, double-sided negative 80° trigon indexable turning insert engineered for heavy roughing, fluctuating depths of cut, and high-shock interrupted machining of Heat-Resistant Superalloys (HRSA) and Titanium alloys (ISO S20 - S30 classification). Featuring Sumitomo's proprietary ultra-thin, high-hardness Super-PVD (TiAlN matrix) coating layer, the AC520U grade delivers exceptional resistance to high-temperature oxidation and adhesion, significantly reducing boundary notch wear common in exotic materials. Paired with the highly stable, heavy-feed EX Type Chipbreaker geometry, this insert efficiently slices through work-hardening layers, eliminates stringy bird-nesting chips, and delivers excellent edge reliability under extreme cutting forces.
2. Product Key Features
- Super-PVD Coating Layer Technology: Utilizes a highly dense, nano-structured TiAlN coating architecture with optimized residual compressive stress. This provides excellent coating adhesion and outstanding boundary wear resistance under extreme thermal loads.
- Heavy-Duty EX-Type Rake Geometry: Engineered with a reinforced cutting edge land and a wide chip deflector basin. The EX geometry balances sharp shearing to reduce heat generation while maintaining optimal edge strength to handle severe mechanical shock.
- High-Rigidity, Fine-Grained Substrate: The AC520U core features an ultra-fine grain tungsten carbide-cobalt compound matrix that maximizes plastic deformation resistance, ensuring the insert pocket holds form under heavy cross-feed operations.
- 6 Cost-Efficient Indexable Edges: The negative 80-degree structural trigon layout provides 6 distinct cutting corners per insert, delivering elite processing economy and maximizing shop floor cost savings.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
Trigon Shape (80°)
0° Relief Angle
M-Class Tolerance
With Hole & Slots
Edge Length (9.525mm)
Thickness (4.76mm)
Nose Radius (0.4mm)
Heavy Roughing
| 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) | 0.4 mm | 0.0156 in (1/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150 in |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) |
|---|---|---|
| Inconel 718 / Nimonic / HRSA Roughing | 25 - 55 m/min (80 - 180 SFM) | 0.15 - 0.35 mm/rev (0.006 - 0.014 ipr) |
| Titanium Alloys (Ti-6Al-4V Interrupted Cut) | 35 - 75 m/min (115 - 245 SFM) | 0.15 - 0.40 mm/rev (0.006 - 0.016 ipr) |
This WNMG0804 / WNMG431 indexable matrix requires standard external or internal negative turning toolholders with a 95° approach angle.
Browse Matching MWLNR/L & WWLNR/L Toolholders →4. Product Application Scenarios
The AC520U high-grade superalloy insert delivers high operational security across demanding machining environments:
5. Toolholder & Equipment Compatibility
Strictly compliant with indexable geometric standard pocket seating, this insert integrates natively into global standard hardware:
- External Shank Holders: MWLNR2020K08, MWLNR2525M08, WWLNR2525M08 (Metric) / MWLNR16-4B, WWLNR16-4B (Imperial).
- Boring Bars (Internal): A32S-MWLNR08, A40T-MWLNR08 (Minimum bore clearance diameter >= 40mm).
- Lathe Integration: Optimized for high-rigidity CNC turning centers (Mazak, DMG Mori, Okuma, Haas) utilizing high-pressure flood coolant delivery to maximize chip clearing and heat dissipation.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC520U (Target) | ISO S20 - S30 / Heavy Interrupted HRSA & Titanium Roughing | Super-PVD Hard TiAlN Base Matrix |
| Sandvik Coromant | GC1105 / GC1205 | ISO S20 / HRSA Heavy Interrupted Cut | PVD multi-layer thin film coating |
| Kennametal | KCS20B / KCS35 | ISO S20 - S30 / High-Shock Superalloy Machining | High-Al content AlTiN PVD system |
| Iscar | IC806 / IC807 | ISO S20 - S30 / High-Impact Titanium Turning | AlTiN PVD hard coating layer |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving structural edge stability and wear control under heavy impact:
"We machine forged Inconel 718 aerospace rings with severe slot discontinuities. Most inserts chip immediately at the depth-of-cut line. Sumitomo's AC520U grade with the EX breaker has given us predictable tool life and amazing notch wear control."
"Hervorragende Wendeschneidplatte für Titanlegierungen. Die Kombination aus zähem Substrat und EX-Geometrie verhindert Ausbrüche bei stark unterbrochenem Schnitt zuverlässig."
"Il controllo del truciolo con il rompitruciolo EX è eccellente anche su materiali pastosi come il titanio a forti avanzamenti."
"耐熱合金の断続加工で抜群の耐塑性変形性を示します。境界摩耗が抑えられるため、長時間の無人運転でも寸法変化が少ないです。"
8. Technical Machining FAQ
Q: Why does the AC520U grade perform better than standard grades on heat-resistant superalloys?
A: HRSAs like Inconel generate extreme thermal loads at the tool-chip interface and rapidly cause plastic deformation. The AC520U grade utilizes an ultra-fine grain tungsten carbide substrate with excellent high-temperature hardness, combined with a specialized Super-PVD coating. This dual-action design forms a thermal barrier that prevents the cutting edge from softening and collapsing under heavy loads.
Q: How does the EX chipbreaker counteract boundary notch wear in exotic metals?
A: Notch wear is heavily driven by the work-hardened line formed by the material's outer skin. The EX chipbreaker utilizes a highly positive, reinforced land angle that actively reduces cutting forces at the depth-of-cut line, effectively sliding chips upward away from the boundary line and distributing structural load across a broader zone.
Q: Is flood coolant mandatory when running this insert?
A: Yes. High-volume flood coolant, or preferably high-pressure coolant (HPC) focused directly on the cutting zone, is highly recommended when machining HRSAs and Titanium. Coolant prevents the material from bonding to the rake face (reducing built-up edge) and aids in thermal dissipation, which is crucial for extending tool life.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain covers ISO S20 to S30 parameters. Explicitly optimized for continuous-to-heavily interrupted cutting of nickel-based alloys (Inconel 718, Waspaloy), cobalt-based alloys, and alpha-beta titanium alloys (Ti-6Al-4V).
Machining Troubleshooting Guide: If severe plastic deformation occurs at the edge, reduce the cutting speed (vc) or select a harder grade like AC510U. If mechanical chipping occurs at the depth-of-cut boundary line, introduce variable depths of cut to vary the impact zone, or lower the feed rate (f).
Authorized Reference Documentation & Endorsements: Dimensional configurations, pocket seating tolerances, and naming structures fully comply with the 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.
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This Sumitomo insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.