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:
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Efficiency: Energy is applied directly to the springs only; surrounding air and fixturing are not heated.
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Precision: Temperature and duration of process are controlled, which also leads to a repeatable process.
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Convenience: Induction heating from Ambrell integrates well into a continuous process.
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