Note: Tempering a Spring

Objective:

To temper a spring by heating it to 570 °F (300 °C) in 2-4 seconds.

End Product:

Stainless steel spring

Equipment:

Ambrell EASYHEAT 2 kW, 150-400 kHz induction heating power supply with a workhead
Multiple-turn C-channel coil developed for this application 

Materials:

Stainless steel AISI 302 springs: different length from 60 to 110 mm, outer diameters 8 mm, wire diameter from 0.3 to 0.6 mm

Temperature:

570 °F (300 °C)

Frequency:

326 kHz

Testing:

Springs are mounted on non-metallic mandrels to facilitate loading and unloading and are placed inside the coil. Power is applied for 2-4 seconds, which completes the tempering process. The C-channel distributes the heating evenly and enables the convenient staging and removal of the springs.

Benefits:

  • Efficiency: Energy is applied directly to the springs only; surrounding air and fixturing are not heated.

  • Precision: Temperature and duration of process are controlled, which also leads to a repeatable process.

  • Convenience: Induction heating from Ambrell integrates well into a continuous process.

Tempering a Spring

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