Exploring the Various Types of Springs Produced via CNC Machining(surface finish symbols chart Sandy)

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CNC machining has revolutionized the manufacturing industry by providing precise and efficient methods for producing a wide range of products. In this article, we will delve into one specific area of CNC machining, namely the production of different kinds of springs. From coil springs to torsion springs, we will explore how these vital components are manufactured using advanced computer-controlled machinery.

Types of Springs Manufactured through CNC Machining:

1. Coil Springs:
Coil springs are widely used in various industries, including automotive, aerospace, and machinery. These springs are known for their ability to store mechanical energy when compressed or stretched. Through CNC machining, creating coil springs involves the following steps:

a) Material Selection: The process begins with selecting an appropriate material depending on the application requirements. Common materials include carbon steel, stainless steel, and alloys.

b) Wire Forming: Using a CNC machine, wire bending techniques shape the spring according to the desired dimensions, pitch, and diameter.

c) Heat Treatment: To enhance durability and stability, the coiled wire undergoes heat treatment processes like annealing, quenching, or tempering.

d) Surface Finishing: Several surface treatments such as powder coating, electroplating, or passivation can be employed based on the intended use and corrosion resistance needed.

2. Torsion Springs:
Torsion springs work by exerting torque when twisted. They find applications in hinges, counterbalances, and numerous other mechanisms. CNC machining allows for accurate production of torsion springs by following these steps:

a) Material Selection: Similar to coil springs, choosing the right material is crucial for torsion springs to withstand the required load and maintain elasticity. Materials commonly used include high-carbon steels, stainless steel, and alloyed metals.

b) Wire Bending: A CNC machine effectively bends the wire into complex shapes based on the design specifications and the required angle of twist.

c) Heat Treatment: To increase the flexibility, strength, and fatigue resistance, torsion springs undergo heat treatments that can vary depending on the material used. Stress relieving may also be performed to minimize distortion and spring relaxation.

d) Surface Enhancement: Depending on the application, additional surface treatments such as shot peening, electroplating, or painting may be applied to improve corrosion resistance or aesthetics.

3. Extension Springs:
Extension springs are designed to resist axial pulling forces between two points. These springs often find applications in trampolines, garage doors, and various mechanical devices. CNC machining aids in their production through the following steps:

a) Material Selection: Similar materials used for coil and torsion springs can also be utilized for extension springs, with consideration given to load requirements.

b) Wire Bending: The wire is bent using a CNC machine into specific shapes and sizes to match the desired tension properties and working length.

c) Forming Hooks: Extension springs typically require hooks at each end for attachment purposes, which are created through wire forming techniques under precise control provided by CNC machines.

d) Heat Treatment & Surface Finishing: As with other types of springs, heat treatment processes enhance tensile strength and durability. Additionally, appropriate surface finishes are applied based on environmental conditions and aesthetic preferences.


CNC machining plays a pivotal role in the efficient production of different types of springs. From coil springs to torsion and extension springs, this advanced manufacturing technique ensures precision and consistency in meeting varying industrial needs. By utilizing state-of-the-art computer-controlled machinery, manufacturers can produce high-quality springs that offer optimal performance across numerous applications. CNC Milling