Manufacturing Double Torsion Springs with Camless Spring Machines

Double torsion springs are widely used in automotive systems, household appliances, industrial equipment, furniture hardware, and many other applications where balanced rotational force is required. Compared with standard torsion springs, double torsion springs have a more complex structure, requiring precise control of coil dimensions, leg angles, center spacing, and symmetry.

Modern camless spring machines provide the flexibility and accuracy needed to manufacture these demanding spring designs efficiently and consistently.

What Is a Double Torsion Spring?

A double torsion spring consists of two helical coils connected by a center section. Each coil works together to generate rotational force while distributing stress more evenly than a single torsion spring.

Typical features include:

• Two symmetrical coils

• One center bridge

• Two spring legs

• Precise leg angles

• Accurate center spacing

Because of their balanced design, double torsion springs provide stable torque and long service life.

Why Are Double Torsion Springs Difficult to Manufacture?

Compared with compression or extension springs, double torsion springs require much tighter control over multiple forming dimensions.

Critical manufacturing requirements include:

• Coil diameter consistency

• Equal number of coils

• Accurate center spacing

• Symmetrical leg positioning

• Precise forming angles

• Stable torque characteristics

Even small dimensional deviations can affect spring performance and assembly.

Why Choose a Camless Spring Machine?

Traditional cam-driven spring machines often require multiple mechanical adjustments to produce complex torsion springs.

Camless spring machines eliminate mechanical cams and use independent servo-controlled slides instead.

This provides significant advantages for double torsion spring production.

Independent Servo Control

Each forming tool moves independently, allowing precise control of every forming step.

Higher Forming Accuracy

Digital servo positioning improves repeatability and reduces dimensional variation.

Faster Product Changeovers

New spring designs can be produced by loading different CNC programs instead of replacing mechanical cams.

Easier Product Development

Prototype springs can be developed and optimized more quickly.

Double Torsion Spring Manufacturing Process

The production process typically includes the following steps.

Step 1: Wire Feeding

The wire is fed into the machine through precision feed rollers.

Stable feeding ensures consistent spring dimensions.

Step 2: Coil Forming

The machine forms the first and second coils with precise diameter and pitch control.

Servo synchronization ensures both coils remain symmetrical.

Step 3: Center Bridge Forming

The bridge section connecting the two coils is accurately formed according to the product drawing.

Step 4: Leg Forming

Independent forming slides create the required leg angles and lengths.

Complex leg geometries can be produced without mechanical cam adjustments.

Step 5: Cutting

The finished spring is cut automatically with clean and consistent end quality.

Industries That Use Double Torsion Springs

Automotive Industry

• Door lock mechanisms

• Seat adjustment systems

• Brake components

• Interior hardware

Home Appliance Industry

• Washing machines

• Ovens

• Refrigerators

• Dishwashers

Furniture Industry

• Hinges

• Folding mechanisms

• Adjustable chairs

Industrial Equipment

• Mechanical linkages

• Safety devices

• Automation equipment

Agricultural Machinery

• Latch systems

• Lever mechanisms

• Equipment assemblies

Advantages of Camless Spring Machines for Double Torsion Springs

Excellent Symmetry Control

Independent servo slides maintain consistent left and right coil geometry.

High Precision

Accurate positioning reduces dimensional variation between production batches.

Flexible Programming

Programs can be modified easily for different spring specifications.

Shorter Setup Time

Program changes replace mechanical cam replacement, significantly reducing setup time.

Better Production Efficiency

Faster changeovers allow manufacturers to process multiple product models efficiently.

Consistent Product Quality

Servo-controlled forming ensures repeatable production and stable spring performance.

How Yinfeng Camless Spring Machines Improve Production

Yinfeng camless spring machines are designed specifically for demanding spring applications requiring flexibility and precision.

Key advantages include:

• Independent multi-axis servo control

• High-speed CNC operation

• Stable wire feeding system

• Easy program editing and storage

• Quick product changeover

• English and customized language support

• Professional technical training and after-sales service

These features enable manufacturers to produce high-quality double torsion springs with greater efficiency and lower production costs.

Best Practices for Producing Double Torsion Springs

To achieve consistent quality, manufacturers should:

• Use high-quality spring wire.

• Inspect forming tools regularly.

• Optimize CNC parameters through sample testing.

• Verify coil symmetry and leg dimensions.

• Perform routine machine calibration.

• Save optimized production programs for repeat orders.

Following these practices helps improve accuracy and reduce scrap.

Conclusion

Double torsion springs require precise control of multiple forming dimensions, making them one of the most demanding spring products to manufacture. Camless spring machines provide the flexibility, precision, and efficiency needed to produce these complex springs with excellent repeatability.

For manufacturers seeking higher productivity, faster product development, and superior spring quality, Yinfeng camless spring machines offer an advanced and reliable solution for modern double torsion spring production.