Product Description
Materials: Tension Springs areproduced using wide variety of materials
including music wire, hard drawn, oil tempered, galvanized wire,
stainless steels and phosphor bronze, as well as exotics such as pre
plated materials (gold, silver, tin) inconel, chrome vanadium and many
others.
Specifications: Tension spring of high quality with competitive price, wire diameter
from 0.08mm to 18mm.ISO 9001
Capabilities of Tension Spring:
Diameter to. 800" diameter; Thick to. 048" flat strip
Detailed Photos
Our production
1. Material Sourcing
Steel Selection: Tension springs are typically made from high-carbon steel, stainless steel, or alloy steel. Choose the material based on the required durability, corrosion resistance, and flexibility.
Quantity & Quality: Ensure you have a reliable supplier with consistent delivery times to avoid production delays. Also, ensure the materials meet the required specifications for your tension springs.
2. Design & Specifications
Spring Parameters: The design of tension springs depends on the specific requirements. These include the diameter, wire thickness, spring length, load capacity, and spring index (ratio of diameter to coil thickness).
Customization: If your clients need custom designs, it's important to have a team or software that can quickly adjust and produce tailored designs.
3. Manufacturing Process
Coiling: This is the first step in the production of tension springs. A coiling machine is used to wind the wire into a helical shape. Make sure the machine can handle the wire thickness and tension needed for your specific product.
Heat Treatment: After coiling, the springs must undergo heat treatment to ensure they have the necessary strength and elasticity. This is usually done in a furnace to temper the steel.
Surface Treatment: Springs often need to be coated (e.g., with zinc, black oxide) to improve their corrosion resistance. This can be done via plating or powder coating.
4. Testing & Quality Control
Load Testing: Each batch should be tested to ensure the springs meet the required load-bearing specifications. Use load-testing machines to simulate real-world applications.
Dimensional Checking: Ensure that each spring meets the specified dimensions and tolerances (e.g., length, diameter, coil count).
Fatigue Testing: Tension springs are subject to repeated stretching, so you should check their ability to withstand cycles of stress and return to their original shape without failure.
5. Automation vs. Manual Labor
Automation: Consider automating the production of tension springs, especially for high-volume manufacturing. Machines can coil the wire, heat treat the springs, and even perform load tests automatically.
Manual Quality Checks: While automation speeds up production, manual quality checks are still critical to ensure that there aren't any defects in the springs.
6. Inventory Management
Raw Materials: Keep track of your raw material inventory to ensure you have enough wire, coatings, and other essentials to meet production needs.
Finished Products: Implement a system to manage finished product inventory. This ensures you have enough stock on hand to meet customer orders without overproducing.
7. Packaging & Delivery
Packaging: Depending on the customer requirements, tension springs need to be packaged properly to prevent damage. You might use plastic bags, bubble wrap, or cardboard boxes to protect the springs during shipping.
Shipping Logistics: Make sure to have an efficient system for order fulfillment and timely shipping, especially if you're dealing with large orders or international customers.
8. Sustainability & Waste Management
Recycling: Since steel is highly recyclable, you should plan for scrap management. Recycle any leftover materials or scrap from the production process to reduce waste and cut down on costs.
Energy Efficiency: Manufacturing processes like heat treatment and coiling can be energy-intensive, so look into ways to optimize energy consumption in the plant.
9. Software & Data Analytics
ERP System: Implement an Enterprise Resource Planning (ERP) system to streamline production, track inventory, manage orders, and handle logistics.
Data Monitoring: Use sensors and IoT technology to monitor the production line, quality, and machine performance. This can help prevent downtime and improve efficiency.
10. Compliance & Certifications
Standards Compliance: Ensure that your springs meet industry standards (like ASTM or ISO standards for spring manufacturing) to ensure product quality and reliability.
Certifications: If needed, get your production processes certified to ensure you meet safety, quality, and environmental regulations.
Our quality control
Packaging & Shipping
1. Material Sourcing and Inspection
Raw Material Quality Check:
Verify the steel's grade (carbon, stainless, alloy steel) through certificates of analysis (CoA) from suppliers.
Inspect for any visible defects such as surface cracks or inconsistencies in diameter.
Perform a hardness test to ensure it meets the specifications for strength and elasticity.
Check for correct wire thickness, ensuring it matches the design specifications (e.g., 0.8 mm, 1.5 mm, etc.).
2. Design & Specifications Validation
Design Review:
Confirm that the spring design complies with the customer's requirements for load, dimensions, and material.
Use CAD software or simulations to verify that the designed spring will meet the required mechanical properties.
Dimensional Verification:
Double-check all dimensions against the design specifications, especially the spring length, coil diameter, and number of coils.
3. Coiling Process QC
Coiling Consistency:
Inspect the coil for uniformity in spacing and coil diameter.
Ensure there are no irregularities such as pitch deviations or coil overlaps.
Coil Shape & Smoothness:
Check for consistent coil shape and ensure there are no sharp edges or deformations that could affect performance.
4. Heat Treatment QC
Temperature Monitoring:
Verify that the furnace is operating within the correct temperature range to temper the springs (typically around 800-900°C depending on material type).
Use thermocouples or sensors to ensure even heat distribution across the entire batch of springs.
Post-Treatment Strength Test:
Conduct a hardness test after heat treatment to ensure that the springs have reached the desired mechanical properties (usually measured via Rockwell or Vickers hardness scales).
5. Surface Treatment QC
Coating Thickness:
Check the coating thickness (e.g., zinc, black oxide, or powder coating) to ensure it is within specification. This ensures the springs will have proper corrosion resistance.
Use a coating thickness gauge to ensure uniformity across all springs.
Adhesion Test:
Conduct an adhesion test to ensure the coating is properly bonded to the spring and doesn't peel off under stress.
6. Load Testing (Mechanical Performance)
Deflection Test:
Perform a deflection test to ensure the spring can elongate under load and return to its original shape.
Measure the amount of elongation under a specific force and compare it with the design expectations.
Load-Compression Test:
Apply a known load to the spring and measure the force required to achieve a certain amount of elongation. Ensure that the spring performs within its specified load limits.
7. Fatigue Testing
Cycle Testing:
Subject the springs to repeated cycles of extension and release to test for durability and fatigue resistance.
Monitor the spring for any signs of deformation, breaking, or loss of elasticity after a defined number of cycles (typically several thousand).
8. Dimensional & Functional Inspection
Dimensional Inspection:
Verify that the dimensions of the spring (e.g., overall length, inner and outer diameter, coil diameter, and number of coils) are within specified tolerances using a micrometer or caliper.
Visual Inspection:
Inspect each spring visually for defects such as cracks, scratches, kinks, or irregularities in the coil shape.
Check for any inconsistencies in the coil pitch (distance between coils) and ensure the ends are properly formed.
9. Packaging & Handling QC
Spring Integrity During Packaging:
Ensure that the springs are not damaged during packaging. Use adequate protective materials (like bubble wrap or foam) to prevent deformation during shipment.
Check that packaging is durable and clearly labeled with necessary specifications (e.g., part number, dimensions, quantity).
10. Final Product Inspection Before Shipping
Batch Quality Control:
Randomly select samples from each batch and perform a comprehensive inspection of their dimensions, load performance, surface coating, and fatigue resistance.
Documented Test Results:
Keep records of all test results (load tests, fatigue tests, hardness, etc.) for traceability and quality assurance purposes.
Customer Specifications Compliance:
Double-check that the final product meets all customer specifications and custom requirements (e.g., packaging, certifications, etc.).
11. Waste Management & Recycling QC
Scrap Inspection:
Ensure that any leftover material or springs that don't meet the QC standards are properly identified as scrap and set aside for recycling.
Recycling Process:
Track the recycling of defective springs or scrap material to ensure it is being repurposed or disposed of in an environmentally responsible manner.
12. Software & Data Monitoring (Optional)
Automated Data Logging:
Implement automated systems for recording test results, machine settings, and production data. This helps in quickly identifying any patterns that may indicate quality issues.
Performance Monitoring:
Use sensors to monitor the machines during production for any signs of wear, misalignment, or inconsistencies in the process that might affect spring quality.
The applications
Extension springs are in our daily life everywhere, small electronics, house appliances, from being in our cars , to the farm machinery that produces our food.
1. Tampolines. The trampoline has hundreds of hook end extension springs forming the trampoline base to the metal frame.
2. Vehicles , vehicles use heavy duty extension springs because of the amount of power and strength they require to pull.
3. Small electronics, like toys.
Extension springs make the electronics to function as designed.
4. House appliances , like washing machines
Springs are likewise used in washing machines to suspend the drum in position.
5. Furnitures, doors, windows etc
extension springs to help the house doors or furnitures close back over once they have been opened.
7. Exercising facilities
The most common exercise equipment that use extension springs like the Chest Expander, and other strenght training facilik
FAQ
1.Is Bosswinn a manufacturer ?
A: We are a manufacturer, the business owner has 2 factories producing springs, machining part, stamping parts
2. When is the delivery time?
A: 10 and 15 days , one month in the peak seasons
3. What is the MOQ?
For the initial order , any quantity ok. For the mass production order, 10000 pcs better.
4. What's your payment method?
: T/T, L/C, Western Unions,
5. How can we confirm the samples?
Free samples are offered,
Audited Supplier 
){kind=link}