Archive: Dec 2023

Cold & Hot Coils: Unraveling the Mysteries of Industrial Spring Manufacturing

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Click to ExpandCold & Hot Coils: Unraveling the Mysteries of Industrial Spring Manufacturing

Cold and hot coils in industrial spring manufacturing are spiral wound structures formed from various materials such as steel or alloys. These components are the foundational building blocks for creating different types of springs across industries. The manufacturing process involves precisely winding the metal into a coiled shape, determining the spring’s characteristics and performance.

This article will delve into cold and hot coils, exploring the processes involved in their production.

Cold Coil Manufacturing Processes

Cold coils are formed at or near room temperature, employing techniques like cold drawing or coiling. This method enhances the spring’s tensile strength and surface finish while maintaining dimensional accuracy. The following are the processes essential for ensuring the production of high-quality cold-coiled springs for diverse industrial uses:

Cold Drawing

Cold drawing reduces the diameter of a wire or rod by pulling it through a die at room temperature. The process begins with a material (wire or rod), which is then progressively drawn through a series of dies with decreasing diameters. This mechanical deformation delivers numerous benefits, including increased tensile strength and improved surface finish.


Grinding is a precision machining technique that improves cold coil surface finish by removing defects and irregularities. This tedious process guarantees that the coils fulfill quality requirements, producing a more visually pleasing and mechanically reliable finished product. The overall effectiveness of grinding is essential in the durability and performance of cold-coiled springs in diverse industrial applications.

Shot Peening

Shot peening is a cold working process where small, round particles are forcefully directed at the surface of cold-coiled springs. This induces compressive stress in the material, improving fatigue resistance and overall durability. The process is especially advantageous for applications involving cyclic loading, as it helps mitigate the potential for fatigue failure over time.

Hot Coil Manufacturing Processes

Hot coils refer to coiled springs that are manufactured at elevated temperatures. The hot coiling process enhances the metal’s formability, creating industrial springs with specific mechanical properties. Here are the different manufacturing processes involved in this technique:

Hot Rolling

Hot rolling is a metalworking process where the material is subjected to high temperatures and passed through rollers. It aims to decrease the metal’s thickness before shaping it into a coil. The elevated temperatures during hot rolling make the material more malleable and enhance its formability. This enables the creation of hot-coiled springs with specific design requirements.

Heat Treatment

Following hot coiling, heat treatment refines the material’s microstructure and enhances mechanical properties. The process involves quenching, which rapidly cools the hot-coiled springs, followed by tempering to achieve the desired hardness, strength, and resilience. Quenching adds hardness by freezing the microstructure, while tempering reduces brittleness and optimizes toughness.

Shot Blasting

Shot blasting is a surface treatment method where abrasive particles are propelled at high velocity onto hot-coiled springs. This process enhances the surface finish by removing any scale or oxidation formed during the hot manufacturing processes. The result is an improved appearance of the springs and better corrosion resistance.

Draco Spring Mfg. for High-Quality Spring Products

At Draco Spring Mfg., we have high-quality manufacturing processes that enable us to create spring products like cold and hot coils. We also offer custom design and manufacturing services, tailoring our solutions to precisely match the individual requirements provided by our clients. This approach allows us to meet the evolving needs of various industries.

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A Deep Dive Into Industrial Spring Types: Which Is Right for Your Project?

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Industrial springs are mechanical devices used in various applications to store and release energy. They are often made of durable materials such as steel and are designed to endure heavy loads and repeated use. These components work on the elasticity principle, deforming under force and reverting to their original shape once the force is withdrawn.

Finding the right type of spring is essential for optimizing the performance and longevity of industrial equipment. The choice usually depends on the specific project requirements, including load capacity, deflection range, and environmental conditions. Here are the most widely used industrial spring types and their respective applications:

1. Compression Springs

Compression springs can absorb and store energy when subjected to a compressive force. They are known for their helical coil shape and find extensive use in mechanisms where the primary load is axial compression. Their design considers factors like wire and coil diameter and the number of coils, all of which influence the spring’s behavior.

Applications of compression springs include the following:

  • Aerospace components
  • Automotive suspension systems
  • Consumer electronics
  • Industrial machinery
  • Medical devices

2. Constant Force Springs

Constant force springs, or flat spiral springs, are specialized kinds designed to exert a consistent force throughout their range of motion. Unlike traditional industrial spring types that exhibit force based on compression or extension, these components provide a steady force over their entire length. They are typically created by winding a flat material strip onto a drum, creating a spiral configuration.

Flat spiral springs are ideal in the following applications:

  • Brush springs in electrical devices
  • Cable and wire retractors
  • Measuring tapes
  • Retractable badge holders
  • Window counterbalances

3. Gas Springs

Gas springs, also called gas struts or gas lifts, provide controlled and adjustable support through compressed gas, usually nitrogen. They consist of a cylinder filled with pressurized gas and a piston that moves within the chamber. They are also widely used in various applications where controlled force, damping, and motion control are essential.

Here are some specific utilizations of gas springs:

  • Aircraft seat adjustments
  • Automated machinery
  • Ergonomic chairs
  • Hospital beds
  • Lifting mechanisms

4. Tension Springs

Extension springs are a type of coiled spring designed to resist pulling forces or tension. They operate by absorbing energy when stretched and releasing it as they return to their original, coiled position. The primary application of these components is to provide resistance to a pulling force, making them essential in various mechanical systems.

The following are common applications of extension springs:

  • Agricultural machinery
  • Consumer products
  • Garage doors
  • Industrial equipment
  • Trampolines

5. Torsion Springs

Torsion springs are helically wound springs that exert a torque or rotary force when twisted. They store and release energy as they are subjected to angular displacement. These components are employed in various applications requiring rotational force, as they provide a means to store and release energy in a controlled manner.

Common industrial applications of torsion springs include the following:

  • Automotive suspension systems
  • Clothespin mechanisms
  • Electronic components
  • Garage door mechanisms
  • Industrial machinery parts

6. Wave Springs

Wave springs are coiled devices that produce a high force in a small space. Unlike traditional industrial spring types, their flat-coiled design allows for a lower operating height while maintaining similar force and deflection characteristics. This makes them ideal for situations where a significant load needs to be supported within tight dimensional constraints.

Applications of wave springs are as follows:

  • Aerospace systems
  • Automotive components
  • Bearing preload applications
  • Electronic devices
  • Medical devices

Partner With Draco Spring Mfg. for Reliable Spring Products

At Draco Spring Mfg., we have state-of-the-art manufacturing processes and innovative techniques that enable us to create high-quality springs! We also understand that each project comes with unique specifications and challenges. Therefore, we offer custom design and manufacturing services, tailoring our springs to precisely match the individual requirements outlined by our clients.

Contact us today to partner with us!