SUMITOMO WNMG080404N-GU AC520U (WNMG 431-GU) Superalloy Turning Insert
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SUMITOMO WNMG080404N-GU AC520U (WNMG 431-GU) PVD Carbide Heat-Resistant Alloy Turning Insert
1. Product Overview
"Which indexable carbide insert grade and chipbreaker configuration are best suited to prevent localized notch wear, reduce cutting forces, and ensure structural edge stability during medium turning of titanium alloys and nickel-based heat-resistant superalloys?"
The SUMITOMO WNMG080404N-GU AC520U (internationally recognized in imperial nomenclature as WNMG 431-GU) is an industrial-grade, double-sided negative 80° trigon indexable turning insert engineered specifically for medium roughing to general turning of heat-resistant superalloys (HRSA) and titanium alloys (ISO S classification). Engineered with Sumitomo's pioneering PVD coating technology, the AC520U grade provides extreme resistance to adhesion, thermal cracking, and localized boundary notch wear. Paired with the highly engineered, low-cutting-force GU Type Chipbreaker geometry, this insert efficiently slices through gummy materials, mitigates severe work hardening, and yields long-lasting, predictable performance across variable CNC production paths.
2. Product Key Features
- Advanced PVD Coating Matrix: Features a smooth TiAlN-based PVD layer optimized for thermal protection. This configuration delivers an excellent thermal barrier and surface smoothness, drastically reducing built-up edge (BUE) adhesion and boundary notch wear on sticky heat-resistant alloys.
- Optimized GU-Type Rake Geometry: Engineered with a sharp, positive cutting edge and a specialized variable deflector wall. It effectively minimizes cutting resistance by up to 15%, lowering thermal buildup at the tool-tip while providing outstanding chip control across mixed depths of cut.
- High-Toughness Substrate Matrix: The AC520U matrix features a highly specialized structural substrate designed to absorb heavy mechanical impacts and counter thermal fatigue caused by intermittent coolant applications during exotic alloy machining.
- 6 Highly Cost-Effective Cutting Corners: The negative structural profile leverages a double-sided arrangement to provide 6 distinct indexable cutting corners per insert, delivering elite structural economy without sacrificing pocket seat stability.
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)
Medium Breaker
| 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) |
|---|---|---|
| Titanium Alloys (Ti-6Al-4V Processing) | 40 - 90 m/min (130 - 295 SFM) | 0.10 - 0.25 mm/rev (0.004 - 0.010 ipr) |
| Nickel-Based Superalloys (Inconel 718 Turning) | 25 - 60 m/min (80 - 195 SFM) | 0.08 - 0.22 mm/rev (0.003 - 0.009 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 specialized exotic grade provides premium security across high-spec processing operations:
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: Engineered for high-rigidity CNC turning centers (Mazak, DMG Mori, Okuma, Haas) utilizing high-pressure flood coolant delivery systems to optimize chip clearing.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC520U (Target) | ISO S20 - S30 / High-Reliability General Superalloy Machining | High-Adhesion PVD Hard Layer Matrix |
| Sandvik Coromant | GC1105 / GC1115 | ISO S15 - S25 / Medium HRSA Turning | High-Hardness PVD Coating Layer |
| Kennametal | KCS10B | ISO S10 - S20 / Aerospace Titanium Workpieces | Advanced AlTiN PVD Hard Coating Matrix |
| Iscar | IC806 / IC807 | ISO S10 - S30 / Universal Medium HRSA Cut | TiAlN PVD Coating System |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving structural edge stability and wear control under high speed:
"We rough Ti-6Al-4V stock all day. Built-up edge was killing our dimensional tolerances until we put these Sumitomo AC520U inserts in the machine. The GU breaker keeps chips tightly curled and tool life predictable."
"Hervorragende Standzeit bei Inconel 718. Die PVD-Beschichtung schützt die Schneidkante perfekt vor Kerbverschleiß. Absolut prozesssicher."
"Ottimo controllo del truciolo su titanio. Il tagliente resiste alla scheggiatura anche su tagli leggermente interrotti."
"チタン合金の旋盤加工で使用。コーティングの平滑性が素晴らしい。溶着が原因の境界摩耗やチッピングが大幅に減少し、難削材の加工でも寸法精度が安定して維持できています。"
8. Technical Machining FAQ
Q: Why should I select the AC520U grade over a traditional CVD grade for superalloy applications?
A: The AC520U grade utilizes an ultra-thin, highly uniform PVD coating over a sharp, high-toughness substrate. Unlike thicker CVD coatings, PVD preserves a much sharper cutting edge radius. Sharpness is essential when cutting heat-resistant alloys or titanium to reduce localized friction, eliminate built-up edge, and prevent rapid notch wear development.
Q: How does the GU chipbreaker address the work-hardening tendencies of Inconel?
A: The GU chipbreaker features a uniquely optimized positive rake geometry that creates a highly effective shearing action. By cleanly cutting rather than pushing the gummy material, it reduces the depth of the work-hardened layer on the workpiece surface, protecting subsequent cutting edges from accelerated notch wear.
Q: What is the recommended coolant strategy when running this insert?
A: High-pressure flood coolant targeted directly at the tool-workpiece interface is strongly advised for exotic alloys. This rapid cooling action manages structural heat deflection and assists the GU profile in washing away stringy chips before they wrap around the workpiece.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain spans ISO S20 to S30 parameters. Tailored explicitly for medium profiling, copy turning, and light roughing of titanium alloys (Ti-6Al-4V), nickel-based superalloys (Inconel 718/625), and cobalt-chrome variations.
Machining Troubleshooting Guide: If advanced built-up edge or chipping occurs, confirm your cutting speed (vc) is not too low, or increase coolant delivery pressure. If rapid boundary notch wear occurs, adjust your machining path depth to avoid rubbing against the cast crust, or shift to a tougher insert radius profile.
Authorized Reference Documentation: Physical sizing constraints, pocket mounting tolerances, and international parameters strictly follow the regulatory ISO 1832:2017 blueprint. Cutting recommendations and metallurgical properties are cross-referenced directly from official technical datasheets 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.