| Item | Parameters | ||||
|---|---|---|---|---|---|
| Core Material Base | High-Carbon Chromium Bearing Steel (AISI 52100 / SUJ2 / 1.3505 / 100Cr6) | ||||
| Precision Grade Ratings | ISO P0, P6, P5, P4 / ABMA ABEC-1, ABEC-3, ABEC-5, ABEC-7 Grade Standards | ||||
| Radial Internal Clearance | Standard C2, C0 (Normal), C3, C4, C5 (High-temperature transmission setups) | ||||
| Vibration & Noise Ratings | Z1V1, Z2V2, Z3V3 (Low-noise motor grade for high-end electric motors) | ||||
Grade: G10 to G1000
| Ball diameter variation | Spherical deviation | Surface roughness | Diameter variation | Diameter tolerance | |
|---|---|---|---|---|---|
| Gade | Vdws | △Sph | Ra | Vdwl | Tdn |
| Not Over | |||||
| μm | |||||
| 10 | 0.25 | 0.25 | 0.02 | 0.5 | * |
| 16 | 0.4 | 0.4 | 0.032 | 0.8 | * |
| 20 | 0.5 | 0.5 | 0.04 | 1 | * |
| 24 | 0.6 | 0.6 | 0.05 | 1.2 | * |
| 28 | 0.7 | 0.7 | 0.06 | 1.4 | * |
| 40 | 1 | 1 | 0.08 | 2 | * |
| 60 | 1.5 | 1.5 | 1 | 3 | * |
| 100 | 2.5 | 2.5 | 0.1 | 5 | ±12.5 |
| 200 | 5 | 5 | 0.15 | 10 | ±25 |
| 500 | 12.5 | 12.5 | * | 25 | ±50 |
| 1000 | 25 | 25 | * | 50 | ±125 |
Bearing Steel Wire Sourcing & Micro-Structure Inspection
The manufacturing lifecycle of high-load cylindrical roller bearings begins with selecting ultra-clean, vacuum-degassed high-carbon chromium bearing steel wire rods (premium AISI 52100 / GCr15 steel grade). Every incoming coil undergoes strict eddy-current and ultrasonic inspection to eliminate raw material sub-surface cracks. The wire rods then pass through an automated spheroidizing annealing furnace and vertical wire drawing machines to calibrate the exact raw wire diameter required for production.
Automated Cold Heading for Precision Roller Blank Formation
The calibrated alloy wire is fed into high-speed, automated horizontal roller cold heading machines utilizing ultra-hard tungsten carbide (WC) matrix dies. This precision roller cold heading process shears the continuous wire and applies heavy axial pressure for near-net-shape blank formation. This plastic deformation preserves continuous internal metal grain flow lines, drastically increasing the fatigue life of the barrel-shaped roller blanks and fine needle blanks.
Soft Grinding
The newly forged, unhardened 420 steel balls are rolled between heavy cast-iron plates under high pressure. This step removes the "equator" seam (flashing) created during cold heading.
Soft grinding improves the initial sphericity of the AISI 420 balls and relieves internal surface stresses, creating a perfectly uniform foundation before the critical heat treatment and hardening phase.
Controlled Atmosphere Heat Treatment & Martensitic Quenching
To achieve excellent wear resistance, the rough-ground rollers undergo continuous martensitic quenching inside mesh-belt conveyor furnaces. This protective atmosphere heat treatment is saturated with a nitrogen-methanol gas matrix to eliminate surface decarburization or oxidation.
Micrometric Centerless Finish Grinding & Outer Diameter Calibration
Post-heat treatment, micro-scale thermal distortions are removed via multi-pass abrasive grinding. Hardened precision rollers pass through high-precision centerless grinders utilizing vitrified CBN (Cubic Boron Nitride) grinding wheels. This micrometric centerless finish grinding phase achieves significant roundness deviation reduction and complete cylindrical error elimination, anchoring the outer diameter calibration within strict sub-micron dimensional tolerance barriers.
Logarithmic Roller Profile Superfinishing & Micro-Crown Modification
Standard cylindrical rollers with straight outer profiles suffer from severe edge stress concentration under heavy radial loads. To resolve this, R&S utilizes specialized oscillation superfinishing machines where high-frequency oscillating abrasive stones profile the rolling surface into a mathematically precise logarithmic profile with a micro-convex crown modification.
Dual-Gaging Automatic Sorting & Inspection
Final quality assurance requires 100% automated, non-destructive testing (NDT) before packaging. Every production batch is funneled through a high-speed laser automatic sorting machine integrated with optoelectronic and pneumatic sensors.
Maximum Radial Load Capacity ：Utilizing premium vacuum-degassed SUJ2 / 1.3505 bearing steel, our rollers can withstand immense radial shock loads without structural fatigue, subsurface spalling, or mechanical deformation.
Logarithmic Roller Crowning : Our finishing lines grind a precise, mathematically optimized modified crown profile onto each roller body, shifting peak mechanical stresses to the center, reducing friction torque by up to 25%, and eliminating rib scuffing.
Automated Multi-Stage Roller Sorting：To achieve flawless load distribution, roller diameter groups are managed within ultra-tight grouping tolerances. This precise pairing prevents uneven wear across the wholesale cylindrical roller bearings assembly.
Advanced Vacuum Cryogenic Hardening: Our atmosphere-controlled vacuum quenching processes lock the core hardness at a uniform HRC 58-65, maintaining a retained austenite level of ≤10\%for long-term dimensional stability up to 150 °without geometric distortion.
Annual Manufacturing Capacity & High-Volume Cylindrical Roller Bearing Output
Massive Annual Production Scale: Utilizing fully automated CNC grinding and assembly lines, our facility delivers an annual capacity exceeding 5 million sets of high-precision radial roller bearings.
Advanced Industrial Cylindrical Roller Bearings Grinding & Thermal Treatment Infrastructure
Automated Micro-Honing Production Lines: Risheng operates state-of-the-art raceway super-finishing tracks, controlling inner and outer ring surface roughness strictly within Ra≤ 0.1 pm for a flawless mirror finish.
In-House Vacuum Hardening Workshops: Our atmosphere-controlled vacuum quenching and liquid-nitrogen cryogenic chambers lock the core hardness of AISI 52100 / SUJ2 steel at a uniform HRC 58-65, limiting retained austenite to ≤10%.
Wholesale OEM/ODM Customization Flexibility & Reliable Global Logistics Supply Chain
Precision Inspection via Digital Micrometer
Changzhou Risheng Steel Ball Co., Ltd. is Founded with a deep commitment to heavy-duty mechanical engineering precision, Changzhou Risheng (Risheng) has evolved into an elite, internationally recognized cylindrical roller bearings manufacturing plant. Operating from our state-of-the-art Hutang Production Base in Wujin District, Changzhou, we specialize strictly in the advanced R&D, structural design, and large-scale fabrication of high-capacity radial roller bearings and high-precision industrial rolling elements.
As an ISO 9001 & IATF 16949 certified factory, Risheng entirely bypasses middle trading companies and export brokers, offering global procurement managers, industrial gear reducer assembly houses
Multi-Stage Ultrasonic Industrial Degreasing : Prior to sealing, every single wholesale cylindrical roller bearing assembly routes through Risheng’s automated multi-stage ultrasonic washing tracks. This high-frequency cleansing cycle completely eradicates microscopic grinding matrix residues, volatile carbon contaminants, and airborne particles from the inner/outer bearing ring raceways, ensuring zero abrasive friction during initial operational startup.
Anti-Rust Oil Inoculation & Preservation :To shield the super-finished, high-carbon chromium bearing steel against global transoceanic climate variations, we coat the logarithmic rolling elements and internal rib and flange contact zones with a premium, moisture-displacing industrial anti-rust oil barrier. This molecular protection prevents atmospheric oxidation without degrading onsite lubricant film formation.
Moisture-Proof Vacuum Wrapping Protocols: Individual radial assemblies are instantly packed and heat-sealed inside heavy-duty, anti-static vacuum polybags fortified with high-absorption active silica gel desiccants. This rigorous vacuum configuration shields the precision steel components from aggressive maritime salt humidity, atmospheric sweating, and tropical cargo hold condensation.
Heavy-Duty Reinforced Seaworthy Crates : Sealed units are tightly nested within robust, fumigation-free export wooden boxes or heavy-gauge steel drums reinforced with exterior steel perimeter banding. This high-integrity protective framing entirely eliminates geometric brinelling, bearing ring nesting distortion, or physical impacts triggered by rough port container crane handling.
Just-In-Time (JIT) Supply Chain Logistics : As a premier China cylindrical roller bearings Manufacturer, Risheng maintains a permanent, rolling warehouse inventory stock of over 200 tons of standard metric single-row radial assemblies (NU, NJ, NUP series). This massive inventory readiness eliminates factory lead-time friction, guaranteeing swift container dispatch to Shanghai or Ningbo ports within 3-7 business days.
Yes, as a professional cylindrical roller bearing manufacturer, we configure our components to handle variable loading setups. R&S operates an advanced bearing production plant that supplies multiple standardized flange designs:
NU Type: Engineered with no flanges on the inner ring, acting as an ideal free-end bearing to accommodate axial thermal expansion.
NJ Type: Fabricated with a single integral flange on the inner ring, allowing the bearing to sustain limited directional axial loads.
NUP Type: Equipped with a loose flange on the inner ring to provide secure bi-directional axial positioning for industrial gearboxes.
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