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CNC Bearing Rings Technical Specifications
| Shaft Types | Engine Water Pump Shafts, Coolant Pump Spindles, Electric Water Pump Rotors |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, CNC Cylindrical Grinders, CNC Centerless Grinders |
| Dimensional Tolerance | Bearing Journals: ±0.002mm; General Diameters: ±0.005mm |
| Geometric Tolerances | Straightness: 0.005mm/100mm; Coaxiality: 0.003mm; Cylindricity: 0.002mm |
| Common Materials | SUJ2, 42CrMo, 40Cr, SUS440C, SUS304 |
| Heat Treatment | Quenching & Tempering, Induction Hardening (HRC 55-62 on journals) |
| Surface Roughness (Ra) | Ground Bearing Journals: Ra 0.2 - Ra 0.4; Turned Surfaces: Ra 0.8 |
| Machining Features | Stepped Journals, Keyways, Snap Ring Grooves, Threaded Ends, Cross-Drilled Holes |
| Surface Treatments | Black Oxide, Zinc Plating, Phosphating, Nitriding |
| Inspection Equipment | Japanese/German Roundness Testers, CMM, Hardness Testers, Profilometers |
High-Precision CNC Bearing Rings for Reliable Engine Cooling Systems
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium CNC Bearing Rings for the global automotive and machinery industries. Water pump shafts are the critical rotating core of an engine's cooling system, constantly subjected to high-speed rotation, dynamic torsional loads, and corrosive coolant environments. These demanding conditions require the shafts to possess extreme fatigue strength, flawless geometric straightness, and superior surface finishes to prevent premature bearing failure or coolant leakage.
To achieve flawless results, our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, advanced machining centers, and precision cylindrical grinders. The guide bushing technology on our Swiss lathes provides continuous, rigid support to the bar stock, completely eliminating deflection when machining long, slender water pump shafts. This allows us to turn complex stepped geometries, mill keyways, and cut mounting threads in a single continuous setup, ensuring absolute concentricity between the bearing journals and the impeller mounting ends.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as SUJ2 bearing steel, 42CrMo, and 40Cr alloy steel. To guarantee reliable product performance, we apply strict quality inspection protocols utilizing a complete set of testing instruments imported directly from Japan and Germany, verifying hardness, straightness, and dimensional tolerances. We keep innovating to maintain sound business development and warmly welcome domestic and overseas clients to visit our factory and explore custom OEM/ODM cooperation opportunities.
Core Advantages of Xierge CNC Bearing Rings
- Zero-Deflection Swiss Machining: Our Japanese Star CNC Swiss-type lathes utilize continuous guide bushing support, enabling the machining of long water pump shafts without bending or vibration, ensuring superior straightness.
- Extreme Concentricity Control: By completing turning, milling, and drilling in a single continuous setup, we eliminate secondary clamping errors, maintaining coaxiality tolerances within 0.003mm between bearing seats.
- Superior Fatigue Resistance: We strictly select SUJ2 and 42CrMo alloy steels and apply precise induction hardening to the bearing journals, providing excellent wear resistance and torsional fatigue strength for extended engine life.
- Advanced Precision Grinding: Equipped with high-precision CNC cylindrical and centerless grinders, we achieve mirror-like finishes (Ra 0.2) on bearing journals, significantly reducing friction and preventing premature bearing failure.
- Thermal Deformation Correction: For hardened shafts, we meticulously manage heat treatment and utilize grinding post-treatment to correct any micro-warping, restoring exact geometric tolerances and straightness.
- Anti-Corrosion Surface Management: We coordinate various surface treatments, such as black oxide and zinc plating, to ensure the shafts withstand harsh, moisture-rich coolant environments without rusting.
- 3-Decade OEM/ODM Expertise: Since 1990, we have continuously innovated, providing DFM (Design for Manufacturing) optimization for custom pump shaft designs, seamlessly scaling from prototyping to mass production.
Payment Methods & Global Logistics Solutions
Secure International Payment Terms:
To facilitate smooth B2B international trade, we offer flexible and secure payment options. For mass production orders of CNC Bearing Rings, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale automotive or industrial supply contracts, we are fully capable of processing Irrevocable Letters of Credit (L/C) at sight. For initial prototyping, sample orders, or custom tooling fees, PayPal and Western Union are also available to expedite the process.
Global Logistics & Protective Packaging:
We provide comprehensive end-to-end shipping solutions under FOB, CIF, and DAP Incoterms. For urgent prototypes or small batches, we utilize expedited international couriers such as DHL, FedEx, and UPS. For bulk mass production, we offer highly competitive sea freight (LCL/FCL) and air cargo rates through our trusted global forwarder network. Recognizing that water pump shafts are long, slender precision components highly susceptible to bending and oxidation during transit, we utilize specialized packaging: each shaft is individually coated in anti-rust oil and wrapped in VCI (Volatile Corrosion Inhibitor) paper, suspended in custom rigid cardboard tubes or closely spaced EPE foam slots to prevent point contact, and packed in sturdy export-grade wooden cases to ensure zero deformation during international shipping.
FAQ
We utilize Japanese Star CNC Swiss-type lathes equipped with guide bushings. The guide bushing provides continuous, close-fitting support to the bar stock right at the cutting point. This completely eliminates the deflection that traditional lathes experience when machining long, slender components, allowing us to maintain strict straightness tolerances (0.005mm/100mm).
Induction hardening can induce microscopic warping in long shafts. We solve this by leaving a specific grinding allowance before heat treatment. Post-treatment, we utilize precision CNC cylindrical or centerless grinders to systematically remove the allowance and correct the micro-deformation. This restores the shaft's straightness and bearing journal dimensions to exact micro-tolerances.
Yes. Our Swiss-type lathes are equipped with live tooling and synchronized sub-spindles. This allows us to perform radial drilling, part-off, and mill snap ring grooves directly on the machine in a single setup. Because the part is not transferred to secondary machines, we maintain perfect concentricity between the bearing journals and the machined features.
Standard hand tools cannot measure these geometric tolerances accurately. We utilize imported Japanese and German Coordinate Measuring Machines (CMM) and precision roundness testers. The shaft is supported on V-blocks or centers, and the machine traces multiple points along the length and circumference to map straightness, cylindricity, and coaxiality.
For high-speed automotive water pumps requiring excellent wear resistance, we highly recommend SUJ2 bearing steel or 42CrMo alloy steel. After controlled induction hardening, these materials provide a hard, wear-resistant surface (HRC 58-62) on the bearing journals while maintaining a tough, fracture-resistant core to absorb dynamic engine vibrations.
Yes. With over 30 years of experience supplying the automotive industry, we are fully compliant with PPAP (Production Part Approval Process) requirements. We provide complete documentation, including dimensional layouts, material certificates, capability studies (Cpk/Ppk), and measurement system analysis (MSA) to ensure seamless integration into your automotive supply chain.
