SUMITOMO VNMG160408N-UP AC830P Heavy Interrupted Turning Insert for Steel (VNMG 160408 / VNMG 332 Equivalent)
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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.
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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.