| Customization: | Available |
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| Function: | Pressed |
| Material: | Steel |
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| Category | Details | Physical and Chemical Data of Raw Materials | Physical and Chemical Data of Finished Products |
|---|---|---|---|
| Raw Materials | Stainless steel, Music wire Carbon steel(SWC), Alloy steel SEA9260/9254/6150/SUP9/SUP10/SUP12, 51CrV4, etc. | Stainless steel: - Density: Approximately 7.93 g/cm³ - Melting point: 1370 - 1430 °C - Corrosion - resistant due to chromium content forming a passive oxide layer. - Good ductility and formability. Music wire Carbon steel (SWC): - High carbon content (around 0.7 - 0.9%), tensile strength can reach 2000 - 2500 MPa. - Density: about 7.85 g/cm³ - Melting point: 1320 - 1350 °C - Good spring properties, but less corrosion - resistant than stainless steel. Alloy steel (e.g., 51CrV4): - Density: around 7.85 g/cm³ - High tensile strength (up to 1800 MPa), good fatigue resistance. - Contains elements like chromium (Cr) for hardenability and vanadium (V) for strength and toughness. - Melting point: 1420 - 1460 °C |
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| Material Dimension | Diameter/thickness: 0.1 - 8mm | ||
| Workcraft | CNC processing, manual work | ||
| Surface Treatment | Painting, electroplating, polishing, blackening, etc. | Painting: - Thickness of paint film: 0.02 - 0.1 mm typically. - Chemical resistance depends on paint type (e.g., resistant to mild acids and alkalis for some industrial paints). Electroplating: - Zinc plating thickness: 5 - 20 μm, provides corrosion protection by sacrificial anode effect. - Nickel plating thickness: 5 - 30 μm, improves hardness and corrosion resistance. Polishing: - Reduces surface roughness to Ra 0.02 - 0.8 μm for mirror - like finish, improves aesthetic and reduces friction. Blackening: - Forms a thin oxide layer (approx. 0.5 - 1.5 μm thick), enhances corrosion resistance slightly and changes appearance. |
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| Applications | Industrial facilities, automobiles, motorcycles, electronics, sports facilities, telecommunications products | ||
| Quality Certification | ISO9001 - 2000, ISO14000 | ||
| Payment Term | T/T, L/C | ||
| Packing | Plastic bags + cartons; wooden/plastic containers | ||
| Shipment | Sea: Ningbo/Shanghai; Air: Shanghai/Hangzhou |
This process ensures that compression and coil springs, whether for industrial use, automotive applications, or other specialized purposes, are manufactured to meet exacting standards of performance and reliability. Each stage of the quality control process plays a critical role in ensuring the product's durability, safety, and functionality.
1. Incoming Quality Control (IQC):
Upon receiving raw materials, such as wire coils, we conduct a thorough inspection to ensure the materials meet the required specifications. We check for consistency in material composition (e.g., carbon steel, stainless steel), wire diameter, and surface quality. Any deviations from the standard are flagged for rejection or reprocessing. Materials that pass this stage are carefully documented and stored in the appropriate conditions to prevent damage before production.
2. Pre-Production Check:
Before the production line begins operation, a pre-production check is carried out to verify all design specifications and technical drawings. We ensure the wire material is correctly set up, the correct spring-forming equipment is ready, and all setup parameters, such as coil diameter, free length, pitch, and load requirements, are accurate. Any discrepancies are corrected immediately to ensure the production process starts without issues.
3. In-Process Quality Control (IPQC):
During the mass production of compression and coil springs, IPQC involves both full inspection and ongoing monitoring at various stages. This includes checks on dimensional accuracy, coil tightness, and overall spring shape (e.g., cylindrical, conical). We regularly test spring force, material hardness, and fatigue resistance to ensure the springs meet the required load specifications. Automated machinery is calibrated regularly, and operators are trained to identify potential issues early. This stage includes the implementation of statistical process control (SPC) to monitor the consistency and stability of production.
4. Final Quality Control (FQC):
Once the compression springs and coil springs are finished, they undergo a comprehensive final quality check. This involves verifying all critical dimensions, including the spring's outer diameter, inner diameter, and overall length. Surface defects, such as burrs, rust, or corrosion, are also inspected and addressed. We conduct load testing to ensure the springs meet the specified compression force and are within tolerance limits. Additionally, fatigue testing is often performed on high-performance springs to verify they can withstand repeated cycles without failure.
5. Outgoing Quality Control (OQC):
Before shipment, a final inspection is done to verify that the finished goods are packaged correctly and are ready for delivery. Each batch of springs is randomly sampled for additional testing, such as load testing or durability trials, to confirm that they meet both internal and client-specific quality standards. Product certificates, including material certificates and test results, are provided if requested. The final inspection ensures that the compression and coil springs are in optimal condition and meet the highest standards of quality before they leave the factory.
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