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CNC Slender Shafts Technical Specifications
| Shaft Types | Engine Oil Pump Shafts, Hydraulic Gear Pump Shafts, Transmission Pump Spindles |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, 4-axis CNC Machining Centers, Cylindrical Grinders |
| Dimensional Tolerance | Bearing & Gear Journals: ±0.005mm; General Diameters: ±0.01mm |
| Geometric Tolerances | Coaxiality: 0.005mm; Straightness: 0.002mm/100mm; Cylindricity: 0.003mm |
| Common Materials | 42CrMo, 40Cr, SUJ2 (AISI 52100), 1045 Carbon Steel |
| Heat Treatment | Quenching & Tempering, Induction Hardening (HRC 55-62 on journals) |
| Surface Roughness (Ra) | Ground Journals: Ra 0.2 - Ra 0.4; Turned Surfaces: Ra 0.8 - Ra 1.6 |
| Machining Features | Micro Center Oil Holes, Keyway Slots, Threaded Ends, Snap Ring Grooves |
| Surface Treatments & Cleaning | Black Oxide, Phosphating, Nitriding, Ultrasonic Cleaning |
| Inspection Equipment | Japanese/German CMM, Roundness Testers, Hardness Testers, Runout Testers |
High-CNC Slender Shafts for Critical Fluid Dynamics and Torque Transmission
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium CNC Slender Shafts for the global automotive, industrial machinery, and heavy equipment sectors. Oil pump shafts are the core driving components responsible for transmitting rotary motion to the pump gears while maintaining precise clearances within the pump housing. These demanding applications require the shafts to possess extreme torsional fatigue strength, flawless concentricity between the bearing journals and gear mounting diameters, and superior surface finishes. In high-pressure, high-temperature lubrication systems, even a microscopic deviation in cylindricity or a slight surface defect can lead to excessive vibration, internal fluid leakage, and catastrophic pump failure.
To achieve flawless results, our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, advanced 4-axis CNC machining centers, and high-precision cylindrical grinders. The guide bushing technology on our Swiss lathes provides continuous, rigid support, completely eliminating deflection when machining long, slender oil pump shaft geometries. This specialized equipment allows us to turn complex stepped profiles, machine precision keyways, and drill micro-center oil holes in a single continuous setup, ensuring absolute coaxiality.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as 42CrMo, 40Cr alloy steel, and SUJ2 bearing steel, to ensure maximum structural integrity and wear resistance. 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 Slender Shafts
- Zero-Deflection Swiss Machining: Our Japanese Star CNC Swiss-type lathes utilize continuous guide bushing support, enabling the machining of long, slender oil pump shafts without bending or vibration, ensuring superior straightness.
- Extreme Journal Concentricity: By turning complex profiles, drilling center holes, and milling keyways in a single continuous setup, we eliminate secondary clamping errors, maintaining strict coaxiality between the bearing journals and gear seats.
- Superior Fatigue and Wear Resistance: We strictly select 42CrMo and SUJ2 steels, applying precise induction hardening to the sliding journals and gear mounting diameters, providing excellent torsional strength for continuous high-speed operation.
- Advanced Precision Grinding: Equipped with high-precision CNC cylindrical grinders, we achieve mirror-like finishes (Ra 0.2) on bearing journals, significantly reducing friction and preventing premature pump bushing failure.
- Burr-Free Micro-Hole Drilling: To prevent debris from damaging pump gears, we utilize specialized gun drilling and back-chamfering techniques, followed by rigorous ultrasonic cleaning to guarantee 100% clear internal oil paths.
- Thermal Deformation Correction: For hardened shafts, we meticulously manage heat treatment and utilize precision grinding post-treatment to correct any micro-warping, restoring exact cylindricity and straightness tolerances.
- 3-Decade Automotive OEM/ODM Expertise: Since 1990, we have continuously innovated, providing DFM (Design for Manufacturing) optimization and full PPAP documentation for custom pump shaft designs, scaling seamlessly 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 Slender Shafts, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale automotive Tier-1 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 oil pump shafts are long, slender precision components with delicate ground journals and fine keyways highly susceptible to bending, pitting, and oxidation, we utilize specialized packaging: each shaft is individually coated in anti-rust oil and wrapped in VCI (Volatile Corrosion Inhibitor) paper. To prevent point contact and bending, parts are suspended in custom rigid cardboard tubes or closely spaced multi-layer EPE foam slots, packed in sturdy export-grade cartons or wooden cases to ensure zero deformation during international transit.
FAQ
Slender components naturally deflect under cutting pressure. We utilize Japanese Star CNC Swiss-type lathes equipped with guide bushings that provide continuous, close-fitting support to the bar stock right at the cutting point. Additionally, we apply specialized pecking cycles and utilize sharp carbide tooling with optimized shallow depth of cuts to minimize radial forces, ensuring the pump shafts remain perfectly straight.
Induction hardening localized journals on a slender shaft can induce slight thermal warping along its length. We account for this by leaving a specific grinding allowance before heat treatment. Post-quenching, we utilize precision CNC cylindrical grinders to systematically remove the deformed layer, restoring the exact diameter, cylindricity, and straightness tolerances required for smooth operation.
Internal burrs can break off and destroy the pump gears. We use specialized gun drills and carbide micro-drills with optimized pecking cycles directly on the Swiss lathes. This is followed by precision back-chamfering tools and rigorous ultrasonic cleaning. For absolute assurance, we can employ thermal energy deburring (TEM) to vaporize any remaining micro-burrs at the molecular level.
Standard hand tools cannot accurately assess these geometric tolerances. We utilize imported Japanese and German Coordinate Measuring Machines (CMM) and precision roundness testers. The component is supported on V-blocks or precision centers, and the machine traces multiple points along the length and circumference to map straightness, cylindricity, and coaxiality.
For high-pressure hydraulic pumps requiring extreme torsional strength and wear resistance, we highly recommend 42CrMo or SUJ2 bearing steel. After quenching and tempering, we apply localized induction hardening to the journals, followed by nitriding or black oxide treatment. This provides a highly durable, anti-galling surface layer capable of withstanding high-friction lubrication environments.
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 mill certificates, heat treatment logs, capability studies (Cpk/Ppk), and measurement system analysis (MSA) to ensure seamless integration into your automotive supply chain.
