- Incoming material inspection
- In-process inspection
- Final inspection
- Batch management
- 6S management
- Inspection records for critical product categories
Quality control starts with incoming inspection and extends through in-process verification, final inspection, and batch management.
Inspection logic
For B2B buyers, the key requirement is not only spring forming capability but the ability to verify force, geometry, and durability. QIFENG SPRING positions its testing workflow around that requirement.
Supplier Review Checklist
Quality points buyers usually want clarified before quoting sensitive spring programs.
| Checkpoint | How It Is Reviewed |
|---|---|
| Incoming material release | Material certificate alignment, wire or strip condition, and supplier-lot acceptance before production use. |
| In-process forming control | Sampling around dimensions, force behavior, and visible process drift during production. |
| Heat-treatment confirmation | Heat-treatment and tempering outcomes checked against force or hardness expectations. |
| Final inspection and lot lock | Critical dimensions, force checks, appearance, and pack-out separation reviewed before shipment release. |
| Shipment traceability | Batch identity stays connected to inspection results and packaging records for follow-up control. |
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Inspection System
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Testing Focus
- Spring force testing
- Torque testing
- Hardness testing
- Tensile strength testing
- Fatigue strength testing
- Metallographic analysis
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Quality Positioning
The quality workflow is aimed at stable spring force, consistent geometry, and repeatable surface and heat treatment performance across production lots.
Quality Visuals
Inspection and Verification
