SUMITOMO WNMG080404N-LU AC830P Carbide Turning Insert (WNMG 431-LU Metric & Imperial)
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SUMITOMO WNMG080404N-LU AC830P (WNMG 431-LU) Absotech Platinum CVD Carbide Steel Turning Insert
1. Product Overview
"Which carbide insert grade and chipbreaker profile provide the highest impact strength and thermal barrier protection when roughing forged steel under severe interrupted cut conditions on CNC lathes?"
The SUMITOMO WNMG080404N-LU AC830P (internationally designated under imperial nomenclature as WNMG 431-LU) is engineered specifically to eliminate catastrophic edge chipping in heavy-duty roughing and interrupted turning operations. Leveraging Sumitomo's breakthrough Absotech Platinum CVD coating technology alongside the robust, low-resistance LU Type Chipbreaker geometry, this double-sided negative trigon insert delivers maximum processing security, micro-crack prevention, and extended tool life when machining low-to-medium carbon steels, structural alloys, and high-tensile forged components.
2. Product Key Features
- Absotech Platinum CVD Coating: Built with a revolutionary crystal-oriented $\alpha$-Al2O3 and ultra-smooth TiCN multi-layer architecture. This unique stress-control technology minimizes adhesion, reduces micro-chipping, and improves thermal insulation by managing thermal dissipation under severe impact.
- Heavy-Duty LU-Type Chip Breaker Geometry: Engineered with an optimized land angle and reinforced cutting edge to handle high-feed roughing. The wide deflector groove configuration ensures superior chip evacuation during varying depths of cut ($a_p = 1.5\text{mm} - 5.0\text{mm}$), eliminating entanglement hazards.
- 6 Cutting-Edge Trigon Advantage: Utilizes a negative $80^\circ$ profile offering 6 highly secure indexes per insert, optimizing machining economy and structural stability over traditional rhombic alternatives.
- High-Reliability Substrate Composition: Formulated with a specialized tough-carbide matrix that resists deformation and mechanical fatigue under severe mechanical impact and cyclical loads.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
Trigon Shape ($80^\circ$)
0° Relief Angle
M-Class Tolerance
With Hole & Slots
Edge Length ($9.525\text{mm}$)
Thickness ($4.76\text{mm}$)
Nose Radius ($0.4\text{mm}$)
Steel Heavy Breaker
| Dimension Parameter | Metric Specification (ISO) | Imperial Specification (ANSI) |
|---|---|---|
| Inscribed Circle (IC) | $9.525\text{ mm}$ | $0.375\text{ in}$ (3/8") |
| Thickness (S) | $4.76\text{ mm}$ | $0.187\text{ in}$ (3/16") |
| Corner Nose Radius ($r_\epsilon$) | $0.4\text{ mm}$ | $0.0156\text{ in}$ (1/64") |
| Fixing Hole Diameter ($d_1$) | $3.81\text{ mm}$ | $0.150\text{ in}$ |
📊 Recommended Structural Cutting Parameters
| Workpiece Material Category | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Structural Steels & Forgings (Severe Interrupted Cut) | $100 - 220\text{ m/min}$ ($330 - 720\text{ SFM}$) | $0.20 - 0.50\text{ mm/rev}$ ($0.008 - 0.020\text{ ipr}$) | $1.5 - 5.0\text{ mm}$ ($0.059 - 0.197\text{ in}$) |
| Alloy Carbon Steels (Heavy Duty Scaling) | $110 - 240\text{ m/min}$ ($360 - 785\text{ SFM}$) | $0.18 - 0.45\text{ mm/rev}$ ($0.007 - 0.018\text{ ipr}$) | $1.2 - 4.5\text{ mm}$ ($0.047 - 0.177\text{ in}$) |
This WNMG0804 / WNMG432 sequence 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 mechanical composition of the AC830P grade excels at removing oxidized skins, scaled layers, and non-homogeneous surfaces, including:
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 diameter $\ge 40\text{mm}$).
- CNC Clamping Support: Optimized for wedge-clamp and pin-lock multi-direction rigid clamping systems to suppress vibrational displacements.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Type |
|---|---|---|---|
| SUMITOMO | AC830P (Target) | ISO P20 - P35 / Heavy Interrupted & Rough Cut | Absotech Platinum CVD α-Al2O3 |
| Sandvik Coromant | GC4335 / GC4435 | ISO P35 / Shock-Resistant Steel Machining | Inveio™ CVD Al2O3 |
| Kennametal | KCP30B / KC9135 | ISO P30 / Heavy Roughing Steel Cut | CVD Al2O3 TiN |
| Iscar | IC8350 / IC830 | ISO P30 - P40 / High-Shock Heavy Interruption | MTCVD Al2O3 TiCN |
7. Verified Global Performance Evaluations
Real-world manufacturing shop metrics demonstrating tool toughness and wear tracking:
"Our lathe operators were constantly shattering tips on forged 8620 splined shafts. Shifted to the Sumitomo AC830P with the LU breaker. Incredible toughness—edge scaling stopped entirely, and we're getting 40% more parts per corner."
"Hervorragende Leistung bei stark unterbrochenem Schnitt. Die Absotech Platinum Beschichtung verhindert wirksam Kammrisse bei hoher thermischer Belastung auf unseren C60-Stahlwellen. Absolut zuverlässig."
"Grande stabilità su tagli interrotti gravosi. Il rompitruciolo LU scarica benissimo la pressione ad avanzamenti elevati. Consegna puntuale e imballo originale."
"鍛造品の黒皮切削と激しい断続加工用に導入。他社製CVDではチッピングが多発していましたが、AC830Pに変えてから突発欠損が皆無になり、夜間無人稼働ラインの稼働率が劇的に改善しました。"
8. Technical Machining FAQ
Q: When should I choose the AC830P grade over the AC820P or general purpose CVD grades?
A: The AC830P is a specialized, high-toughness grade designated for heavy interrupted cuts and roughing where impact shocks destroy standard inserts. If your application involves stable, high-speed continuous turning, the harder AC820P or AC8025P grades will provide better wear economy. Switch to AC830P specifically when edge chipping or premature breakage occurs.
Q: How does the LU chipbreaker handle chip control at lower depths of cut?
A: The LU chipbreaker features a wider land design configured specifically to reduce cutting resistance under high-feed, high-depth loads ($a_p \ge 1.5\text{mm}$). If you drop the depth of cut below $1.0\text{mm}$, the chip may miss the breaker deflector wall, leading to long ribbon strings. For light-to-medium general steel turning, use the GU or SU chipbreaker instead.
Q: Can this insert be run dry, or is flood coolant recommended?
A: Thanks to the thermal barrier properties of Sumitomo’s Absotech Platinum coating, this insert performs exceptionally well in dry interrupted turning by eliminating thermal cyclical cracking. However, if thermal dimensional stabilization of the workpiece is required, ensure continuous, uniform flood cooling to prevent localized thermal shock.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application falls within ISO P25–P35 parameters. Engineered for carbon steels, alloy steel forgings, high-tensile structural beams, and casting crust profiles exhibiting non-homogeneous structural elements.
Machining Troubleshooting Guide: If plastic deformation of the cutting edge occurs, lower the surface cutting speed ($v_c$) by 15% or drop the feed rate ($f$). If micro-cracking (comb wear) appears across the flank surface, switch to dry machining to prevent the fluid-induced thermal shocks that accelerate crack propagation.
Authorized Reference Documentation: Structural calculations, dimensional sizing tolerances, and system interface cross-references fully comply with the rigorous global metrics dictated by ISO 1832:2017 standards for indexable cutting inserts. Performance envelopes are cross-verified with certified corporate technical datasets hosted by Sumitomo Electric Hardmetal Corp.
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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.