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Yuyao, Ningbo City, China
Bearing Shields Quality
This is the quality control process during dust cover manufacturing. So we ensure every dimension meets specification according to technical drawings. Our system has 6 dedicated inspectors:
1 inspector for incoming raw materials (steel coil chemical composition, thickness certification)
1 inline inspector for production steps (stamping mold alignment, crimp groove depth control)
4 inspector for final products (sealing lip performance, dimensional accuracy)
All raw materials are 100% inspected before production. Each manufacturing step including material blanking – stamping forming – surface treatment has real-time quality checks. Final dust covers undergo full inspection for:
Surface defects (no scratches/burrs)
Critical dimensions (outer diameter ±0.05mm)
Functional performance (simulated installation test)
Stage 1 – Raw Material Control
This is material QC process. We ensure correct steel grade through chemical testing – confirm carbon steel or 304 stainless via analyzer. Thickness verified with micrometer per specs.
Stage 2 – Manufacturing Control
Production QC during stamping. Operators check mold alignment against drawings. Critical checks: crimp groove depth with dial indicator before final forming. Verify outer diameter tolerance post-pressing. Sample inspection for surface defects – no scratches/burrs allowed.
Stage 3 – Final Product Inspection
Pre-shipment QC covers all parameters: surface, dimensions, cleanliness. Simulate installation for sealing lip performance test. Full checklist verification against order specs. 100% conformance to drawings ensured with documented reports.
Bearing Dust Cover Inspection Standards
Comprehensive Guide for Quality Control
Inspection Equipment Requirements
Precision Caliper
Micrometer
Dial Indicator
Image Measurement
Residual Magnetism Tester
Cleanliness Tester
Contour Measuring Device
Demagnetization Device
Key Inspection Parameters
Surface Appearance
- No cracks, rust, scratches, or burrs
- No bubbling, peeling, or uneven coating
- Consistent color across batch products
Dimensional Tolerance
- Verify VDFsp, VdFsp, VDF1sp parameters
- Check outer diameter conformity
- Inspect elastic crimped edge groove
Cleanliness Level
- Test according to standard methods
- Ensure no contamination
- Verify post-cleaning quality
Residual Magnetism
- Must not exceed 0.25 mT
- Use appropriate testing methods
- Demagnetize if necessary
Material Standards
Carbon Steel
Must comply with industry standards for DC01 or higher grade cold-rolled low carbon steel sheet or strip. Surface quality must be at or above premium grade.
Stainless Steel
Must comply with industry standards for cold-rolled stainless steel sheet or strip with appropriate chromium and nickel content for corrosion resistance.
Surface Treatment
Carbon steel dust covers can be zinc-plated, nickel-plated, or oxidized for rust prevention depending on application requirements.
Inspection Process Flow
