## Project Background
The client is a top-tier aviation bearing manufacturer in China, specializing in aircraft engine bearings, spacecraft bearings, and other high-end products. In developing next-generation high-temperature bearings, they faced the following technical challenges:
• Operating temperatures up to 300℃ and above
• Speeds reaching 20,000rpm and above
• Complex and variable load conditions
• Required service life of 50,000+ hours
• Must pass strict aviation certification
## Technical Requirements
### Operating Environment
– **Operating Temperature:** -55℃ to 300℃
– **Speed Range:** 5,000-25,000rpm
– **Load Type:** Radial load + Axial load
– **Lubrication:** High-temperature synthetic grease
– **Environmental Conditions:** High altitude low pressure, vibration and shock
### Performance Standards
– **Hardness Requirements:** HRC58-62
– **Fatigue Life:** L10≥50,000 hours
– **Dimensional Accuracy:** G10 grade
– **Surface Quality:** Ra≤0.02μm
– **Material Purity:** Oxygen content <15ppm
## Product Selection
### Technical Parameters
– **Product Model:** 440C Stainless Steel Ball
– **Specifications:** 9.525mm G10 precision
– **Quantity Required:** 50,000 pieces/year
– **Special Requirements:** Aviation-grade material certification
### Material Advantages
– **High Temperature Performance:** Maintains excellent performance at 300℃
– **Corrosion Resistance:** Resistant to fuel and lubricant corrosion
– **High Hardness:** HRC60, excellent wear resistance
– **Fatigue Strength:** Long fatigue life at high temperatures
## Manufacturing Process
### Material Control
– **Raw Materials:** Vacuum induction furnace melting
– **Chemical Composition:** Strict control of C, Cr, Mo content
– **Purity:** Ultrasonic testing for internal defects
– **Heat Treatment:** Triple tempering process
### Machining Precision
– **Rough Grinding:** Remove surface oxide layer
– **Precision Grinding:** Control dimensional accuracy
– **Polishing:** Achieve mirror finish
– **Inspection:** 100% full-size inspection
## Application Verification
### High Temperature Performance Testing
– **Temperature Range:** -55℃ to 300℃ cycle testing
– **Holding Time:** 2 hours at each temperature point
– **Test Results:** Hardness change <2HRC
– **Dimensional Stability:** Change <0.001mm
### Fatigue Life Testing
– **Test Conditions:** 300℃, 20,000rpm
– **Load Conditions:** 120% of rated load
– **Test Results:** L10 life reached 55,000 hours
– **Failure Mode:** No spalling or fatigue cracks
## Project Results
### Technical Performance Improvement
– **Service Life:** Improved by 40%
– **High Temperature Performance:** Stable operation at 300℃
– **Reliability:** Failure rate reduced by 60%
– **Maintenance Interval:** Extended to 18 months
### Economic Benefits
– **Product Cost:** Reduced by 15%
– **Maintenance Cost:** Reduced by 35%
– **Downtime:** Reduced by 50%
– **Customer Satisfaction:** Improved to 96%
## Quality Assurance
### Certification System
– **Aviation Certification:** AS9100 certified
– **Material Certification:** Compliant with AMS standards
– **Process Certification:** Special process certification
– **Quality System:** ISO9001:2015
### Testing Capabilities
– **Chemical Analysis:** Spectral analyzer detection
– **Hardness Testing:** Rockwell hardness testing
– **Fatigue Testing:** Bearing fatigue testing machine
– **Surface Quality:** Coordinate measuring machine inspection
## Customer Feedback
“440C stainless steel balls perform excellently in our aviation bearings, completely meeting the stringent requirements of high temperature, high speed, and heavy load. The product quality is stable and performance is reliable, winning good reputation for our aviation bearing products in the international market.”