Pig tail and end-forming

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Pigtail forming shapes the end of a coil spring into a tapered or curled form, while end-forming modifies the ends of tubes or rods to meet functional or assembly requirements.

Pigtail Forming

Pigtail forming is a process used primarily in coil spring manufacturing, where the end of a spring is shaped into a tapered or curled form, often resembling a small tail. This shape helps the spring seat properly in assemblies, such as automotive suspension systems, and reduces lateral loads on connected components .

Process: A semi-finished coil spring is mounted on a forming jig. The open end is clamped, and the jig rotates or moves in a controlled path to wind the end into a pigtail shape. The forming jig may move perpendicular to the spring axis to achieve the desired taper or curvature .
Equipment: Machines for pigtail forming are often automated, with programmable jigs that adjust for different pigtail shapes and numbers of turns. Springs are loaded, oriented, and formed automatically, then transferred to subsequent processes like quenching .
Applications: Pigtail ends are common in strut-type suspension devices, barrel-shaped coil springs, and other mechanical assemblies where precise seating and load distribution are critical .

End-Forming

End-forming refers to shaping the ends of tubes, rods, or pipes to meet functional requirements, such as fitting, sealing, or assembly. This process is widely used in metal fabrication and tubing applications .

Methods: Common end-forming techniques include segmented tool sizing, ram forming, rotary forming, roll forming, and spinning. Ram and segmented tooling typically form the entire circumference at once, while rotary, roll, and spinning methods gradually shape the tube, which is useful for sharp angles or diameter changes .
Process Considerations: The choice of method depends on material properties, required deformation, tolerances, and surface finish. Ram forming, for example, compresses the tube end against clamp dies, causing cold flow to form beads or flares .
Applications: End-formed tubes are used in automotive, aerospace, and industrial piping systems, where precise end shapes are needed for connections, fittings, or sealing.

Summary

Pigtail forming is specific to coil springs, creating a tapered or curled end for proper seating and load distribution.
End-forming is a broader metal fabrication process for tubes and rods, shaping ends for assembly, sealing, or functional purposes.
Both processes rely on specialized machinery and precise control to ensure consistent product quality and performance . Understanding these processes is essential for designing mechanical components that require precise end shapes, whether in springs, tubing, or fiber optic applications.

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Pigtail forming shapes the end of a coil spring into a tapered or curled form, while end-forming modifies the ends of tubes or rods to meet functional or assembly requirements.

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