SUMITOMO VNMG160408N-UP AC830P Heavy Interrupted Turning Insert for Steel (VNMG 160408 / VNMG 332 Equivalent)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
SUMITOMO VNMG160408N-UP AC830P CVD Coated Carbide Heavy Interrupted Turning Insert
1. Product Overview
"Which indexable turning insert grade and chipbreaker profile provide the highest fracture toughness for heavy interrupted cuts, rough profiling of structural steel castings, and unstable machining setups without premature edge chipping?"
The SUMITOMO VNMG160408N-UP AC830P is an industrial-grade, 35° rhombic negative double-sided indexable turning insert precision-engineered for the most demanding heavy roughing and severe interrupted cutting cycles. Optimized for the ISO P25–P40 material range (including carbon steels, low-alloy structural steels, and welded structures), this insert features Sumitomo’s ultra-tough AC830P Absotech Technology coating. By applying a thick, highly oriented $\alpha$-$\text{Al}_2\text{O}_3$ (Alumina) and TiCN CVD layer with advanced residual stress control, it provides industry-leading adhesion and micro-chipping protection under high thermal variations. Integrated with the high-strength -UP Type Chipbreaker, it features an optimized lands-and-grooves profile that stabilizes the cutting edge under severe mechanical impacts while ensuring excellent chip control during deeper depths of cut (DOC).
2. Product Key Features
- Absotech Heavy Impact Coating Shield: Utilizes a state-of-the-art crystal alignment CVD matrix that prevents crack propagation from the coating surface down into the carbide core.
- Ultra-High Toughness Carbide Substrate: Specifically engineered with a specialized binder phase enrichment layer to withstand extreme mechanical shock during severe interrupted profiling.
- Heavy-Duty -UP Chipbreaker Geometry: Designed with a reinforced edge land that maximizes structural integrity while minimizing tool pressure during heavy-duty material removal rates (MRR).
- Four Strong Cutting Edges: Negative double-sided layout offers high edge economy and superior pocket seat contact stability inside the toolholder pocket.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Industrial Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Equivalent Benchmark (ANSI) |
|---|---|---|
| Product Designation Model | VNMG160408N-UP | VNMG 332-UP (VNMG332) |
| Inscribed Circle (IC) Diameter | 9.525 mm | 0.375 in (3/8") |
| Insert Thickness (s) | 4.76 mm | 0.1875 in (3/16") |
| Nose Corner Radius ($r_{\epsilon}$) | 0.8 mm | 0.0315 in (2/64") |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed ($v_c$) | Feed Rate per Revolution ($f$) / Depth ($a_p$) |
|---|---|---|
| Carbon & Low-Alloy Steels (Interrupted Cut / Scale) | 120 - 240 m/min (390 - 785 SFM) | 0.25 - 0.60 mm/rev (0.010 - 0.024 ipr) ap: 1.5 - 5.0 mm (0.060 - 0.197 in) |
| Heavy Welded Steel / High Tensile Structure | 100 - 200 m/min (330 - 655 SFM) | 0.20 - 0.50 mm/rev (0.008 - 0.020 ipr) ap: 1.0 - 4.5 mm (0.040 - 0.177 in) |
This VNMG160408 indexable profiling insert requires standard negative 35° toolholders equipped with robust pin-and-clamp or top-clamp pocket lock arrays.
Browse Matching MVJNR / MVUNR / MVQNR Lathe Toolholders →4. Product Application Scenarios
The AC830P heavy CVD turning grade delivers unmatched edge safety across highly demanding structural machining tasks:
5. Toolholder & Equipment Compatibility
Strictly compliant with standard indexable turning seats, this insert operates across all industrial platforms:
- Turning Toolholder Assemblies: Universally compatible with all premium external MVJNR, MVUNR, MVQNR blocks, and heavy-duty internal boring bars using a VNMG 1604 / VNMG 33 structural envelope.
- CNC Equipment Optimizations: Extensively tuned for rigid, high-torque CNC lathes and horizontal turn-mill centers (Mazak, Okuma, Doosan, DMG Mori, Haas) that run high feed roughing cycles.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC830P (Target) | ISO P25 - P40 / Heavy Interrupted & Structural Steel Turning | Absotech Premium High-Toughness CVD Coating System |
| Sandvik Coromant | GC4335 / GC4435 | ISO P35 - P40 / Heavy Roughing & Severe Interruption | Inveio® Alumina Crystal orientation matrix |
| Kennametal | KCP40B / KCU40 | ISO P35 - P45 / Maximum Impact Resistance Matrix | Thick CVD wear layer over highly ductile substrate |
| Iscar | IC8350 / IC807 | ISO P30 - P40 Heavy Rough Turning & Shock Cutting | SUMO TEC high-toughness PVD/CVD structural coating |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world shop feedback showcasing excellent reliability in high-impact roughing and deep profiling tasks:
"We use the VNMG 332-UP AC830P on cast steel gear housings with multiple cross bores. Every other insert we tested chipped out within 5 parts. This Sumitomo grade absorbs the pounding easily, maintaining a predictable wear curve for over 22 parts per corner."
"Hervorragende Leistung bei stark unterbrochenem Schnitt auf geschweißten Konstruktionsstählen. Die Kombination aus zähem Substrat und der Absotech-Beschichtung verhindert Kammrisse absolut zuverlässig, selbst bei ungleichmäßiger Kühlmittelzufuhr."
"Inserto eccezionale per sgrossatura pesante. Il rompitruciolo -UP richiede un po' più di potenza ma garantisce che i taglienti resistano ad urti violenti senza rompersi. Molto affidabile."
"黒皮付きの大型鍛造鋼シャフトの倣い加工で使用。AC830Pの耐欠損性は群を抜いています。-UPブレーカの刃先強度が強く、突然の破損で機械が止まるリスクが激減しました。コストパフォーマンスが非常に高いです。"
8. Technical Machining FAQ
Q: How does the AC830P grade differ from the AC820P grade?
A: While the AC820P grade is optimized for high-speed continuous cutting and maximum crater wear resistance, the AC830P grade is specifically formulated with higher substrate elasticity and impact resistance, making it the preferred choice for rough casting scales and severe interrupted cuts.
Q: What are the feed rate limits for the -UP heavy-roughing chipbreaker geometry?
A: The -UP geometry is designed to perform best at feed rates between 0.20 and 0.60 mm/revolution. Running below 0.20 mm/rev may result in poor chip breaking because the edge profile is reinforced to handle thicker mechanical chip loads.
Q: Can this insert be run dry under heavy interrupted configurations?
A: Yes. The Absotech CVD coating provides excellent thermal insulation, allowing it to excel in dry machining. For interrupted cuts, dry running is often preferred to avoid the severe thermal cycling shock caused by intermittent flood coolant hitting the hot cutting edge.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Main application range covers ISO P25 to P40 specifications. Uniquely engineered for heavy carbon structural steels (e.g., ASTM A36), forged low-alloy steel shafts (4140/4340), and cast steel blocks under unstable toolholding setups.
Machining Troubleshooting Guide: If sudden edge fracturing occurs despite the high toughness of the AC830P substrate, audit for excessive fixture deflection or adjust the depth of cut ($a_p$) to stay within the recommended 1.5 - 5.0 mm range. If rapid flank wear is encountered under high-speed settings, reduce the cutting velocity ($v_c$) to increase tool life predictability.
Authorized Reference Documentation & Endorsements: Dimensional values, clearance specifications, and naming nomenclature adhere strictly to international industrial standards conventions. Mechanical structural properties and performance thresholds are verified against empirical testing data 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.