Key Process Control Points
Quality assurance and manufacturing standards for ooxAuto products
ooxAuto maintains strict quality control throughout the manufacturing process. Each critical operation is monitored and verified to ensure products meet or exceed international standards and customer expectations.
Piston Rod Manufacturing
Manufacturing Process
Cold Drawing
Precision cold-drawn round steel
Centerless Grinding (Rough)
Initial grinding to near-finish dimensions
High-Frequency Surface Hardening
Quenching and tempering for wear resistance
Centerless Grinding (Fine)
Precision finish to exact specifications
Chrome Plating
Micro-crack chromium coating for corrosion protection
Surface Polishing
Final polishing for quality and appearance
Quality Control Parameters
Material Selection
- • 35#, 45#, 40Cr steel grades
- • High tensile strength
- • Non-stainless steel
- • Consistent composition
Chrome Plating Standards
- • Total thickness: 15-20μm
- • Micro-crack density: ≥400 cracks/cm
- • Hardness: ≥HV900
- • Uniform appearance
Plating Defect Prevention
Common plating defects (roughness, blistering, burning, peeling, crystalline deposits) are prevented through strict control of:
- • Current density optimization
- • Plating solution temperature
- • Pre-treatment procedures
- • Operator technique and training
Working Cylinder Manufacturing
Technical Standards
Cylinder specifications comply with:
GB/T3639-2000
Cold-drawn and cold-rolled precision seamless steel tube technical conditions
GB/T8713-1998
Precision seamless steel tubes for hydraulic and pneumatic cylinders
Mechanical Properties
- Cold-worked/hardened (Y) condition
- Yield strength verified
- Tensile strength confirmed
- Elongation tested
Dimensional Tolerances
Straightness
0.4mm per 1000mm (0.05-0.08mm for formed cylinders)
Bore Tolerance
H8 grade precision
Surface Finish
Ra 0.4 μm maximum roughness
Damper Fluid Specifications
Base Formulation
Base Oil Options
- Mineral oil
- Silicon oil
- (Lower viscosity, higher flashpoint)
Additives Package
- Viscosity index improvers
- Anti-wear agents
- Anti-foam additives
- Anti-oxidants
Performance Requirements
VISCOSITY STABILITY
Excellent viscosity-temperature performance maintains consistent damping force
TEMPERATURE RANGE
High flashpoint and low pour point for all-weather operation
ANTI-FOAM
Superior foaming resistance for normal damper operation
WEAR PROTECTION
Anti-wear and lubricating properties extend service life
CORROSION PROTECTION
Rust and oxidation inhibitors protect internal components
COMPATIBILITY
Compatible with rubber and plastic seals
Approved Suppliers
ooxAuto partners with leading international damper fluid manufacturers:
- Shanghai Hailian
- Hongfu Corporation
- FUCHS (Germany)
- ELF (France)
- Nippon Oil (Japan)
Piston Assembly Manufacturing
Manufacturing Process
Material & Components
- Iron-base powder metallurgy
- PTFE piston rings
- Precision valve components
- Flow control orifices
Process Steps
- 1.Powder mixing
- 2.Forming
- 3.Sintering
- 4.Post-treatment & coating
Quality Assurance
Critical importance for ensuring accurate damping force characteristics:
- Dimensional accuracy of all orifices and valve components
- Surface finish quality to minimize flow resistance variation
- Material density consistency for reliable damping force
- Flow testing to verify damping characteristics match specifications
Final Quality Testing
Performance Testing
- Damping force curve verification at multiple velocities
- Compression and rebound cycle testing
- Endurance and durability testing
- Seal integrity verification
Physical Inspection
- Visual inspection for defects
- Dimensional measurement verification
- Surface finish quality assessment
- Assembly alignment verification
Commitment to Quality
Every ooxAuto damper and suspension component undergoes rigorous testing and verification to ensure exceptional reliability, performance, and longevity. Our process control standards exceed industry requirements, reflecting our commitment to customer satisfaction.