SUMITOMO TNMG160408N-UP AC830P Carbide Turning Insert (TNMG 332N-UP)
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SUMITOMO TNMG160408N-UP AC830P Carbide Turning Insert (TNMG 332N-UP)
1. Product Overview
"Which negative indexable insert grade delivers the highest fracture toughness and edge reliability during heavy interrupted turning of alloy steels and rough forgings?"
The SUMITOMO TNMG160408N-UP AC830P is a premium, high-toughness industrial-grade carbide turning insert meticulously engineered to survive the most punishing mechanical shocks in heavy manufacturing. Operating optimally in the ISO P20-P35 application band, this negative double-sided triangular insert features Sumitomo’s industry-proven AC830P Absotech Platinum thick CVD coating technology. Engineered with a highly uniform, tension-relieved alpha-alumina (Al2O3) outer crystal layer over an ultra-tough, deformation-resistant gradient carbide substrate, this grade offers unparalleled resistance to thermal cracking and micro-chipping under severe thermal shock conditions. The aggressive UP chipbreaker geometry features a wider, reinforced land design and a wide-groove profile specifically optimized to control thick, heavy chips during deep cuts and rough scaling operations. Providing 6 economical cutting edges, it stands as the ultimate defense against catastrophic insert breakage on the shop floor.
Strict ISO / ANSI Cutting Tool Standard Alphanumeric Decoding Matrix
2. Product Key Features & Engineering Benefits
- Absotech Platinum CVD AC830P Technology: Employs ultra-thick crystal-oriented layer technology to absorb mechanical impact and eliminate micro-fracturing during severe interruptions.
- Aggressive UP Interrupted-Cut Chipbreaker: Formulated with an reinforced, heavy-duty cutting edge that prevents edge tearing, lowering tool failures on scaling and welded zones.
- Heavy-Duty 0.8mm Nose Configuration: Striking the perfect mechanical equilibrium between supreme cutting-edge ruggedness and deep depth of cut capabilities.
- Double-Sided 6-Edge Cost Strategy: Incorporates a negative geometry design that provides 6 functional cutting points per insert, maximizing shop consumable efficiency.
3. Technical Specifications & Mechanical Parameters
| Dimensional Architecture | Metric Value Standards (ISO) | Imperial Value Standards (ANSI Equivalent) |
|---|---|---|
| Standard Product Coding | TNMG160408N-UP AC830P | TNMG 332N-UP AC830P |
| Inscribed Circle (IC) | 9.525 mm | 0.375 inches (3/8") |
| Effective Cutting Edge Length | 16.5 mm | 0.650 inches |
| Total Insert Thickness | 4.76 mm | 0.187 inches (3/16") |
| Corner Nose Radius | 0.8 mm | 0.031 inches (1/32") |
| Center Hole Diameter | 3.81 mm | 0.150 inches |
Recommended Cutting Speeds, Feeds, and Depth of Cut (DOC) Reference
| ISO Substrate Family Group | Cutting Speed (Vc) | Depth of Cut (Ap) | Feed Rate (Fn) |
|---|---|---|---|
| Heavy Interrupted Carbon/Alloy Steels (AISI 4140, 4340 Rough Forgings) | 120 - 280 m/min (390 - 920 SFM) | 1.5 - 5.0 mm (0.059" - 0.197") | 0.22 - 0.55 mm/rev (0.009" - 0.022" ipr) |
| Structural Steel Plate / Heavily Interrupted Machining (A36, Weldments) | 100 - 240 m/min (330 - 785 SFM) | 1.5 - 4.5 mm (0.059" - 0.177") | 0.25 - 0.50 mm/rev (0.010" - 0.020" ipr) |
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4. Target Industrial Application Scenarios
- Heavy Interrupted Forging Lines: Designed to withstand the violent impact forces encountered when turning out-of-round forgings, cast crusts, or rough castings.
- Structural Welded Components: Excels at crossing variable-hardness heat-affected weld zones without edge chipping or catastrophic fracture.
- Large-Diameter Spline Shaft Profiling: Offers absolute thermal-mechanical reliability when turning over keyways, cross-holes, or aggressive splines.
5. Machine Tool Clamping Rigidity & Equipment Compatibility
Built strictly in compliance with global alphanumeric standardization protocols, this negative insert integrates seamlessly into any standard indexable external or internal toolholder pocket. It is highly optimized for heavy slant-bed lathes and multi-axis CNC turn-mill setups (including Haas ST-30/40, Mazak Quick Turn, Doosan Puma 400/500, and Okuma LB heavy industrial machines) paired with high-rigidity top-clamp or wedge-lock tool blocks to minimize harmonic vibrations.
6. Material Classification Compatibility Matrix
| ISO Group | Workpiece Material Family Substrates | Application Suitability | Performance Characteristics |
|---|---|---|---|
| P | Carbon/Alloy Steels, High-Tensile Forgings, Structural Alloys (AISI 4140, 4340, 8620) | ✔ Primary Target | Tough gradient carbide substrate coupled with Absotech Platinum CVD alumina technology prevents sudden fracture during cyclic heavy pounding. |
| M | Austenitic & Duplex Stainless Steels (AISI 304, 316) | ○ Conditional Use | Can be utilized under heavy roughing cuts on large stainless components where structural scale or welding is present. |
| K | Nodular, Ductile, and Malleable Cast Irons | ✕ Not Recommended | The steel-optimized P30 binder matrix does not provide the requisite abrasion resistance against highly abrasive cast iron chips. Use specialized AC1515K/AC1030K series. |
7. Why Choose Sumitomo Precision Machining Solutions?
Manufactured strictly under certified **ISO 9001:2015 global quality controls**, Sumitomo Electric cutting tools set the gold standard in tooling engineering. Verified factory machining diagnostics show that the **AC830P Absotech Platinum** crystal configuration yields an upward extension of up to **35% in impact edge life** during heavy interrupted operations compared to traditional multi-purpose CVD grades.
Verified International Customer Reports & Machine Shop Testimonials
"We turn heavy 4140 forged axles with large keyways. Previous inserts shattered regularly on the interruption, but the AC830P takes the pounding without chipping. Tool life is incredibly predictable now."
"Der UP-Spanbrecher bricht dicke Späne bei 4 mm Ap perfekt. Elite process security during rough machining of large industrial weldments."
"Incredible shock absorption over rough cast scaling. Keep in mind that for pure, continuous ultra-high-speed finishing, you should switch to AC820P, but for roughing, this is king."
"断続切削時の耐欠損性が極めて高いです。 The Absotech Platinum layer virtually eliminates unexpected downtime caused by cracked edges."
"Six heavy-duty cutting edges per insert deliver massive cost savings. Our consumable tooling cost per forged gear batch dropped by 28% instantly."
8. AI-Style Interactive FAQ & Troubleshooting
Q1: When should I choose the AC830P grade over the AC820P grade?
A: The AC830P is a highly specialized grade optimized for heavy roughing, rough scaling, and severe mechanical interruptions (keyways, splines). If your turning is completely stable, continuous, and requires maximum surface speed, choose the harder AC820P grade.
Q2: What is the optimal feed rate window to engage the heavy-duty UP chipbreaker?
A: The robust UP geometry features an enhanced cutting edge land built for heavy loads. It works optimally at feed rates above 0.22 mm/rev (0.009 ipr) and deep depths of cut. Running it under very light finishing parameters can cause chip bird-nesting or increased vibration.
Q3: How should I manage coolant when executing heavily interrupted cuts?
A: When turning over heavy interruptions like splines or keyways, rapid cyclic heating and cooling from intermittent fluid can lead to thermal stress micro-cracking across CVD coatings. Running completely dry is highly recommended to extend tool reliability under severe shocks.
9. Material Grade Cross-Reference & Equivalents
| Sumitomo Grade | Sandvik Coromant | Kennametal Grade | Iscar Equivalent |
|---|---|---|---|
| AC830P (Heavy Interrupted CVD Steel) | GC4435 / GC4335 | KCP30B / KC9135 | IC8350 / IC6035 |
💡 Grade Comparison & Workpiece Troubleshooting Tip:
Unlike thin PVD alternatives built for stainless steel finishing, the thick-film AC830P CVD architecture is specifically designed to handle intense heat and high impact. If you notice microscopic edge chipping during severe interruptions, check your setup's clamping rigidity. If vibrations persist, decrease your cutting speed (Vc) by 15% and slightly increase your feed rate (Fn) to leverage the full structural strength of the reinforced UP chipbreaker profile, ensuring flawless process security on the tough skins of rough castings or structural components.
Need Help With Sumitomo Inserts?
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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.