Induction Tempering Spring with High Frequency Induction Heating Equipment
Objective Temper a spring by heating it to 300Ā°C (570Ā°F) in 2 ā 4Ā seconds
Material Stainless steel AISI 302 springs- different length from 60 to
110 mm – outer diameters 8 mm.- wire diameter from 0.3 to 0.6Ā mm
Temperature 300Ā°C (570Ā°F)
Frequency 326 kHz
Equipment ā¢ DW-UHF-10kW induction heating system
ā¢ remote workhead, two 0.33Ī¼F capacitors (total 0.66Ī¼F)
ā¢ multi-turn C-channel coil developed for this application
Process Springs are mounted on non-metallic mandrels to facilitateĀ loading and unloading and are placed inside the coil (picture).Ā Power is applied for 2 ā 4 seconds, completing the temperingĀ process. The C-channel distributes the heating evenly andĀ enables the convenient staging and removal of the springs.
Results/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
Convenience: method integrates into a continuous process