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| Function: | Pressed |
| Material: | Steel |
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Bosswinn Torsion Ramp Springs - Precision-Tuned for Rotational Force and Long-Term Performance
Bosswinn Torsion Ramp Springs are high-performance mechanical components designed to deliver controlled rotational energy for a wide variety of applications, including automotive, machinery, doors, ramps, and industrial systems requiring precise torque. Engineered with accuracy and reliability in mind, these springs provide consistent torsional force, smooth operation, and long-lasting stability even in the most demanding environments.
Crafted from premium materials such as stainless steel, hardened carbon steel, or phosphor bronze, and finished with advanced protective coatings, Bosswinn Torsion Ramp Springs are built to withstand corrosion, wear, and mechanical fatigue. Their coiled structure and tightly controlled winding angles ensure optimal torque output, dependable performance, and a long service life.
The design allows for efficient energy storage and release during angular movement, making installation easier and operation smoother. Whether used in loading ramps, industrial doors, or rotational mechanisms, Bosswinn Torsion Ramp Springs are a trusted solution for high-load, high-precision needs.
Bosswinn Torsion Ramp Springs - Key Features
Controlled Rotational Force
Designed to deliver precise torque and angular motion control, ensuring reliable performance in rotating or pivoting applications.
Premium-Grade Materials
Manufactured from high-quality carbon steel, stainless steel, or specialty alloys with anti-corrosion surface treatments to ensure long-lasting durability.
Outstanding Fatigue Life
Built to endure millions of cycles without significant performance loss-ideal for demanding environments that require repeated motion.
Fast and Easy Assembly
Engineered for quick installation into shafts, hinges, or mechanical interfaces, reducing labor time and improving productivity on the assembly line.
Reliable in Extreme Conditions
Performs consistently under fluctuating temperatures, high stress, and exposure to moisture or chemicals-suitable for both indoor and outdoor use.
High-Precision Coiling and Bending
Produced using CNC coiling and forming processes for exacting tolerances, ensuring consistent torque output and seamless integration into mechanical systems.
Wide Range of Applications
Used in ramps, lids, access panels, automotive assemblies, agricultural equipment, door mechanisms, and heavy-duty machinery.
Tailor-Made Solutions
Offered in various coil diameters, leg lengths, wind directions, and torque specifications. Custom designs available to meet unique OEM and industry requirements.
Bosswinn Torsion Ramp Springs - Technical Specifications
Precision-Engineered for Controlled Motion and Torque Modulation
| Material Type | Common Grades | Surface Treatment | Key Properties |
|---|---|---|---|
| Stainless Steel | SUS301, SUS304, SUS316 | Passivation, Electropolishing | Excellent corrosion resistance, consistent spring torque |
| Carbon Steel | 65Mn, 70#, SK5 | Phosphating, Black Oxide, Zinc Plating | High fatigue strength, reliable under cyclic loading |
| Phosphor Bronze | C51000, C52100 | Natural Finish, Tin Coating | Stable under varying temperatures, low friction coefficient |
Material Thickness: 0.3 mm - 3.0 mm
Hardness Range: HRC 40-55 (depends on material and heat treatment)
Tensile Strength:
Stainless Steel: 900-1200 MPa
Carbon Steel: 1200-1600 MPa
Phosphor Bronze: 400-800 MPa
| Parameter | Typical Range / Options | Notes |
|---|---|---|
| Torque Output | 0.05 Nm - 10 Nm (customizable) | Based on material, coil diameter, and arm length |
| Coil Diameter | 5 mm - 50 mm | Inner or outer diameter depending on design |
| Arm Length | 10 mm - 150 mm | Designed to interface with cam profiles or levers |
| Winding Direction | Left-hand, Right-hand | Application-specific |
| Surface Coating | Zinc, Nickel, Black Oxide, Dacromet | Improves durability and corrosion resistance |
| Cycle Life | > 200,000 cycles | Designed for high-repetition motion |
| Tolerances | ±0.03 mm (diameter), ±2° (angle) | Precision coiling and forming ensures consistency |
| Working Temperature | -40°C to +250°C | Suitable for automotive and industrial environments |
Multi-arm Configuration: Double-leg, offset-leg, or custom-leg styles
End Forming: Hooks, tangs, or machined ends for application fit
Pre-Tensioned Design: For increased torque in smaller envelopes
Logo Stamping: For traceability and branding
Packaging Options: Bulk, tray-packed, or automated line compatible
Incoming Quality Control (IQC):
Validate material grade and supplier certificates (e.g., 55CrSi, 60Si2Mn).
Measure wire diameter, tensile strength, surface hardness, and straightness.
Inspect for surface defects: rust, pitting, cracks, or dents.
Surface Cleaning (if required):
Degreasing, pickling, or shot blasting to remove scale and ensure a clean surface before coiling.
Equipment: Automatic wire feeders, cutting machines.
Action: Wire is straightened and cut to predetermined lengths if not coiled from spools.
Tolerance: Length accuracy within ±0.1 mm to ensure precise coil geometry.
Process:
CNC-controlled spring coiling machines or custom mandrel setups for ramp profile.
Torsion arms are formed with precise angular deflection based on ramp angle.
Parameters:
Arm angle, coil diameter, number of coils, and leg position are precisely programmed.
Tolerance: ±0.05 mm on dimensions; ±1° on leg angles.
Purpose: To achieve required hardness, elasticity, and fatigue strength.
Methods:
Stress relieving after forming
Hardening & tempering for critical load-bearing applications
Temperature Range: 400°C-600°C, depending on spring material and load rating.
Verification:
Rockwell or Vickers hardness test
Torsion load test at specified deflection
Options:
Zinc plating (bright or yellow), Black oxide, Phosphate coating, or Powder coating
Function:
Corrosion resistance
Enhanced surface finish
Improved fatigue life
Testing:
Salt spray resistance (48-96 hrs)
Coating thickness gauge
Adhesion test (tape pull or scratch test)
Operations (if needed):
End grinding, leg trimming, hole drilling or slotting
Welding or rivet attachment if torsion spring is part of an assembly
Tools: High-precision grinders, punch presses, or CNC milling.
Quality Control: Angle verification, length measurement, and alignment check.
Mechanical Tests:
Torque vs. deflection test
Fatigue life testing (100,000+ cycles)
Angle and leg position verification
Dimensional accuracy (length, coil diameter, leg offset)
Visual Inspection:
Surface finish, coating quality, presence of cracks or deformation
Burrs, sharp edges, and coil uniformity
Identification:
Laser engraving or marking with part number, batch code, or logo
Packing Options:
PE bags in export cartons
Compartment trays for torsion arm protection
Customized packing as per client request
Labeling:
Product name, material grade, batch number, quantity, and specification
Logistics:
Export compliance (RoHS/REACH if required)
Domestic or international shipment scheduling
Bosswinn Torsion Ramp Spring Quality Control Strategies
1. Incoming Quality Control (IQC)
Objective: Ensure only qualified materials are used in torsion ramp spring production.
Key Actions:
• Material Certification Review - Confirm material type and traceability (e.g., 55CrSi, 60Si2Mn, stainless steel grades).
• Physical Property Testing:
Hardness Test - Rockwell or Vickers methods
Tensile Strength Check - Validate supplier claims
Wire Diameter and Cross-Sectional Roundness - Micrometer, laser gauge
• Visual Inspection:
Detect surface defects such as rust, decarburization, cracks, or scale
2. In-Process Quality Control (IPQC)
Objective: Maintain consistent quality throughout the forming and heat treatment process.
Process Checkpoints & Quality Controls:
| Stage | Inspection Focus | Tools/Methods |
|---|---|---|
| Coiling | Coil diameter, pitch, leg orientation | Caliper, coil gauge, visual check |
| Heat Treatment | Torsional strength, stress relief | Hardness tester, microstructure check |
| End Grinding / Trimming | Flatness, parallelism, burr-free finish | Surface plate, dial indicator |
| Surface Treatment | Coating adhesion, corrosion resistance | Salt spray test, thickness gauge |
| Assembly (if applicable) | Leg position, pre-load accuracy | Torque wrench, angle gauge |
3. Final Quality Control (FQC)
Objective: Verify all torsion ramp springs meet Bosswinn standards before shipment.
Key Testing Items:
• Dimensional Inspection
Coil outer diameter, wire diameter, arm length, angles
Tolerance control: ±0.05 mm or as specified
• Spring Torque Test
Measure initial torque and working torque under load
• Fatigue / Lifecycle Testing
Simulated ramp cycles: ≥100,000 without loss of performance
• Surface Finish Verification
No sharp edges, cracks, or coating defects
• Load-Deflection Curve Comparison
Match to engineered curve or customer requirement
4. Corrective & Preventive Actions (CAPA)
• Perform root cause analysis for defects (e.g., coil irregularity, torque deviation)
• Adjust forming tooling, heat treatment parameters, or material source
• Introduce in-line monitoring for high-risk processes
• Regular QC training and performance audits for production staff
5. Optional Customer-Specific Quality Tests
• Salt Spray Test (ASTM B117 - 96 to 240 hours)
• REACH / RoHS Compliance documentation
• Custom Torque Curve Testing based on client application
• Full Lifecycle Simulation (rotational cycles, applied torque loading)
Bosswinn Clip Springs are versatile fastening components engineered for secure, reusable, and vibration-resistant connections across a wide range of industries. Their spring-loaded design ensures a strong and consistent clamping force without the need for permanent fixtures like screws or rivets.
Designed for easy installation, long-term durability, and reliable performance under dynamic conditions, Bosswinn Clip Springs serve as a vital component in both mass production lines and custom assembly systems.
Key Application Sectors
Securing trim panels, dashboard components, and wire harnesses
Fastening HVAC ducts, filter housings, and underbody shields
Vibration-resistant mounts for interior/exterior parts
Fixing wall panels, ceiling frames, ducts, and insulation boards
Supporting cable trays, pipelines, and framing systems
Quick-clip installation for modular structures
Assembly of internal components in washing machines, refrigerators, air conditioners
Mounting printed circuit boards (PCBs), casings, and control modules
Snap-on parts for easy service and disassembly
Holding wires, conduits, or busbars in switchboards or junction boxes
Mounting electrical components on DIN rails or enclosures
Ensuring safe, tool-less installations in compact spaces
Mounting panels, lighting systems, and cable management systems
Withstanding shocks, vibrations, and thermal expansion environments
Durable fastening under heavy-duty conditions
Tool-less fixture of guards, access covers, or service panels
Vibration-absorbing fasteners in dynamic assemblies
Repeatable locking mechanisms for maintenance-friendly design
Zhuji Bosswinn Springs Co., Ltd. is a trusted manufacturer specializing in the design, development, and production of high-performance spring components. With advanced facilities and experienced engineers, we provide customized and standard solutions for various industries.
Custom Spring Manufacturing
Precision-made compression springs, tension springs, torsion springs, and wire forms based on your drawings or samples.
Damping, Suspension & Brake Chamber Springs
Engineering and mass production of springs for automotive, truck, and industrial damping systems.
OEM & ODM Services
Full support from concept design to finished product, including tooling development and sample validation.
CNC Machining & Stamping Parts
Production of precision-machined and punched metal components to complement spring assemblies.
Surface Treatment & Heat Treatment
In-house processes including tempering, black oxide coating, powder coating, and plating to enhance durability and corrosion resistance.
Quality Control & Testing
Comprehensive QC procedures, including load testing, fatigue testing, dimensional inspection, and material certification.
Zhuji Bosswinn is committed to on-time delivery, stable quality, and responsive customer service for both domestic and international clients.
A: Yes, Bosswinn is a professional manufacturer specializing in precision torsion ramp springs. With over a decade of industry experience, we serve a wide range of applications including automotive mechanisms, industrial assemblies, and mechanical actuators.
Our vertically integrated production system includes:
Advanced wire coiling and torsion forming lines
CNC torsion spring winders and torque-setting machines
In-house heat treatment and stress relieving
Specialized labs for torque, cycle life, and corrosion resistance testing
We maintain full process control-from certified wire to packaged finished parts-to ensure performance consistency and on-time delivery.
A: Bosswinn torsion ramp springs are widely used in:
Automotive Systems: Clutch assist mechanisms, gear shift detents, seating assemblies
Industrial Equipment: Loading ramps, control arms, cam mechanisms
Agricultural Machinery: Gate latches, spring-loaded arms
Medical Devices: Adjustable support hinges, torque-sensitive components
Custom Assemblies: Precision force control in rotating and pivoting systems
A:
Standard models: 10-20 working days
Custom designs: 20-35 working days, based on tooling and volume
Urgent projects: Expedited manufacturing is available upon request
Production is tracked with ERP systems for real-time progress updates.
A:
Prototype & New Clients: 100 pcs or fewer
Mass Orders: 5,000-10,000 pcs (optimal cost and efficiency)
Custom Projects: MOQ depends on complexity and setup cost
We remain flexible to support your project stage and demand scale.
A:
T/T (Telegraphic Transfer): 30% deposit, 70% before shipment
L/C: Available for large-scale or government projects
Western Union / MoneyGram: Suitable for small batches or samples
Custom terms can be arranged for long-term partners.
A:
Yes. Free samples are provided for standard torsion spring types.
Custom-designed samples (based on drawings/specs) can be delivered within 5-10 working days.
All samples are tested for:
Torque force consistency
Angle of deflection
Dimensional accuracy
Mass production follows the approved sample specifications strictly.
A:
High-Carbon Spring Steel: 65Mn, 70#, or equivalent
Stainless Steel: SUS302, SUS304 - rust-proof, ideal for exposed use
Oil-Tempered Wire: For high-cycle, heavy-load applications
Surface treatments include black oxide, zinc plating, dacromet, or epoxy coatings based on end-use.
All materials are certified and traceable back to approved mills.
A:
Quality is enforced throughout production via:
Incoming Material Control: Chemical composition and tensile strength tests
In-Process Checks: Angle, torque curve verification, winding accuracy
Final Testing:
Torque calibration within ±5% tolerance
Load-deflection testing
Fatigue life simulation (100,000-1 million cycles)
Surface finish and corrosion testing (salt spray)
Certifications: ISO 9001, RoHS, Material Reports, PPAP (as requested)
A:
Absolutely. Bosswinn's engineering team provides:
Torque & Deflection Simulations
2D/3D Modeling based on samples or concepts
Reverse Engineering for legacy or imported components
Design Optimization for load handling, spring angle, and material savings
We work in SolidWorks, UG, AutoCAD, and support rapid prototyping as needed.
A:
Yes. Bosswinn serves clients across:
Europe: Germany, Italy, Poland, Netherlands
North America: USA, Canada, Mexico
Asia & Middle East: Japan, South Korea, UAE
Others: Brazil, Australia, South Africa
We provide full logistics support including:
Commercial Invoice & Packing List
Certificate of Origin (CO)
HS code matching & Custom declarations
Shipment under FOB, CIF, or DDP terms as required
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