Pigtail head processing method

The pigtail head processing flow involves positioning the coil spring, forming the pigtail end using a jig, and transferring the finished spring for subsequent processing.

Overview of the Process

The pigtail head, typically the end of a coil spring, is formed into a pigtail shape to ensure proper fit and function in assemblies. The process is usually automated and integrated with the coiling machine for efficiency and precision .

Step-by-Step Processing Flow

1. Loading and Positioning
   • The coil spring is loaded onto a specified position on the pigtail forming machine.
   • The end of the spring is oriented by an operator or automatically positioned using a loader, ensuring the open end is correctly aligned for forming .
2. Forming the Pigtail
   • A forming jig, programmed according to the desired pigtail shape, moves to shape the spring end.
   • The spring end is pressed against the jig or a spindle, and the jig rotates or moves centripetally to wind the spring into the pigtail configuration.
   • Typically, the pigtail is formed with 2–2.5 turns, achieving high accuracy and uniformity .
3. Automation and Control
   • The forming machine operates via a pre-set program, controlling the jig movement and rotation.
   • The machine may include sensors or clamping mechanisms to fix the starting position and maintain consistent forming throughout the batch .
4. Unloading and Transfer
   • After forming, the finished spring is unloaded by an operator or automatically transferred to the next stage, such as quenching or heat treatment.
   • The compact design of the machine allows it to be installed near the coiling machine, minimizing handling and improving workflow .
5. Jig Adjustment
   • Different pigtail shapes or numbers of turns require changing the forming jig.
   • This ensures flexibility for various spring designs and maintains precision across different production runs .

Key Considerations

• Accuracy: Proper alignment and jig design are critical to avoid variations in pitch or shape.
• Integration: Positioning the pigtail forming machine near the coiling machine streamlines production.
• Automation: Automated jigs reduce operator intervention and improve consistency.
• Versatility: Machines can handle different spring types, including coil springs, leaf springs, and stabilizer bars . This flow ensures that each coil spring end is consistently formed into a precise pigtail shape, ready for assembly or further processing.