Solid CBN Inserts (100% Pure Polycrystalline Cubic Boron Nitride)
UKing Diamond’s alloy-free solid CBN inserts deliver exceptional shock resistance, wear resistance, and thermal stability for interrupted cutting and deep-cut machining of hardened steel and cast iron, with multi-pass regrinding capability for extended tool life and lower machining costs.
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Description
Uking Diamond’s Solid CBN cutting inserts represent the zenith of tool construction strength. Containing zero carbide backing or silver brazing layers, these solid PCBN matrices provide isotropic structural integrity to withstand violent torque spikes and high red-hardness under devastating thermal and mechanical stress:
Severe Interrupted Automotive & Train Hard Turning
Survives continuous cross-hole, splines, and keyway interruptions when roughing hardened steel gears ( 58–65), preventing crack propagation along the flank.
Heavy-Duty Steel Mill Rolls & Slag Castings
Effortlessly slices through the uneven, abrasive oxidized skin and structural sand inclusions of chilled cast iron and high-manganese steel mill rolls.
Large-Diameter Wind Power Bearings & Slewing Rings
Supports extra-large depth of cut ( ≥2.0 mm) and aggressive feed rates during the initial roughing passes of large-scale forged rings.
Aerospace High-Temperature Superalloys Roughing
Maintains exceptional chemical inertness against thermal sticking and diffusion wear when scaling dense Inconel or titanium forged components.
Models & Specs
| ISO Standard Model | Insert Shape & Topography | Primary Mechanical Application | Industry Standard Sizes |
| RNGN Series | Round / Circular (Maximum edge profiling) | [Catastrophic Interrupted Turning & Milling] 100% solid round blank with no hole. Offers infinite indexable edge alignment and massive strength for heavy mill roll dressing. | RNGN 090300, RNGN 120400, RNGN 120700 |
| SNGN Series | 90° Square (Deep depth cuts) | [Heavy-Duty Skin Roughing & Facing] Square geometry built for deep roughing cuts ($a_p$) in heavily scaled cast blanks and volatile casting crusts. | SNGN 120408, SNGN 120412, SNGN 150712 |
| TNGN Series | 60° Triangle (Max orientation flex) | [Aggressive Plunge & Internal Boring] Triangular footprint engineered for high-feed plunging, deep chamfering, and rough internal boring of hardened housings. | TNGN 160408, TNGN 160412, TNGN 220716 |
| CNGN Series | 80° Rhombic (Heavy negative profile) | [High-Velocity Rough Turning] High bulk toughness rhombic insert for roughing to medium-turning configurations of large automotive drivetrain shafts. | CNGN 120408, CNGN 120412 |
| DNGN Series | 55° Rhombic (Narrow clearance tracking) | [Heavy Copying & Recess Roughing] Double-sided profile clearing tool optimized for deep tracing inside irregular hardened cavities or heavy mold blocks. | DNGN 150412, DNGN 150712 |
1. Isotropic Solid Phase Homogeneity vs. Layered Composites
While tipped or composite tools rely on a thin functional layer backed by carbide, they introduce an internal thermal expansion mismatch line. When a tool hits a deep keyway interruption or a severe casting void at 200 m/min, this composite boundary acts as a stress-collector, leading to severe splitting.
Uking’s Solid CBN inserts feature a 100% homogeneous solid phase block. Sintered under intense HPHT parameters, the pure crystalline microstructure disperses impact energy equally in all directions (isotropic toughness). This eliminates structural delamination vulnerabilities completely, enabling machine operators to run heavy, aggressive dry cuts that would instantly fracture standard layered tooling.
2. Fully Regrindable Lifecycle: Maximizing Your Capital Asset Return
In high-volume heavy industries, a tool is not just a consumable—it is a production asset.
Because Uking’s Solid CBN series contains no carbide backing, the entire insert body consists of cutting-ready PCBN material. Once the initial cutting edges reach their wear limits, the inserts can be reground and re-lap polished multiple times to original specifications.
This multi-lifecycle profile offsets the higher initial purchase price, slashing your long-term tooling cost-per-part over months of continuous production campaigns.
Why Choose Uking Diamond Solid CBN?
Zero Delamination Risk Under Interruption: 100% alloy-free solid block composition ensures absolute structural immunity against severe mechanical impacts.
Extreme Depth of Cut ( ap ) Resilience: Allows maximum material removal rates (MRR) per pass without the clearance constraints of brazing or layering zones.
Multi-Cycle Regrindable Economy: Entire body geometry can be multi-stage reground and re-sharpened, maximizing tool life and destroying long-term inventory costs.
Supreme Thermal Red-Hardness: Retains mechanical edge hardness at intense friction zone temperatures up to 1100°C, perfect for continuous high-speed dry turning.
Application
Are your heavy-duty mill roll dressing or wind-power bearing machining lines constantly stopping due to sudden tool fractures, micro-cracking, or brazing failure under severe interrupted cuts?
Stop gambling your large-scale casting components and expensive CNC spindle time on fragile tipped inserts that cannot survive raw casting crusts. Backed by 20 years of ultra-high pressure large-scale-volume solid PCBN synthesis authority in Henan, China, Uking Diamond manufactures industrial-grade 100% Solid CBN inserts built to conquer the most hostile metal-cutting environments on Earth.
Because these pure solid-phase PCBN blanks represent the highest echelon of superhard manufacturing cost and heavy industrial performance assets, we do not distribute unverified free samples. We focus entirely on high-intent industrial process alignment.
Ready to master severe interruptions and unlock multi-time regrinding economy? Contact our global heavy-duty tooling division today with your current ISO configuration (e.g., RNGN 120400), your exact workpiece alloy spec (HRC\ /HB), and your current bottleneck (e.g., rapid micro-chipping or thermal splitting). Our team will instantly activate your Corporate Solid CBN Evaluation Pass: obtain your prioritized test batch of pure solid CBN inserts at direct factory wholesale cost, with 100% of the sample evaluation fee fully credited back to your balance upon your first bulk commercial order.
[ Contact Our Global Tooling Desk & Request Your Solid CBN Quote Now ]
FAQ
Q: What makes Solid CBN inserts different from tipped or composite CBN inserts?
A: Solid CBN inserts consist entirely of homogeneous PCBN material – no carbide backing, no brazing alloy, and no composite interface. The insert body is fully sintered PCBN from face to base. This construction provides two key advantages:
(1) No interface stress concentrator – in severe interrupted cuts (cross-holes, keyways, casting voids at high cutting speed), the thermal expansion mismatch at a carbide-CBN interface focuses crack propagation perpendicular to the cutting face. Solid CBN eliminates this boundary, distributing impact stress uniformly.
(2) Regrindable lifecycle – because the entire body is cutting-grade PCBN, worn inserts can be reground and re-lap polished 3–5 times to restore original edge geometry, reducing long-term tooling cost per part in heavy production.
Q: What is the maximum working temperature and hardness range for Solid CBN inserts?
A: Solid PCBN retains mechanical hardness at friction-zone temperatures up to approximately 1,100 °C – higher than tipped or composite CBN constructions, which begin to soften at the binder interface above ~900 °C. This makes Solid CBN suitable for continuous high-speed dry turning of hardened steel (HRC 55–65) and high-temperature superalloys (Inconel, Waspaloy) where friction-zone temperatures regularly exceed 1,000 °C. For steel hardness below HRC 50, Solid CBN is technically capable but economically less competitive than coated carbide; the high-temperature stability advantage is most valuable at HRC 58 and above in dry or minimum-quantity lubrication (MQL) cutting conditions.
Q: Which Solid CBN insert ISO geometries are available and what are their primary applications?
A: Uking Diamond Solid CBN inserts are available in:
RNGN series (round, no hole) – the most interruption-resistant geometry due to the continuous circular edge; used for mill roll dressing, large-diameter shaft roughing, and applications where tool approach direction changes.
SNGN (90° square) – high-feed facing and deep skin-pass roughing of scaled cast blanks.
TNGN (60° triangle) – aggressive plunge turning and internal boring of hardened housings.
CNGN (80° rhombic negative) – high-velocity rough turning of automotive drivetrain components.
DNGN (55° rhombic) – deep copying and recess roughing in hardened mold blocks.
All geometries use negative rake angles and S-land or T-land edge preparation for maximum insert body protection during cut entry.
