Induction heating springs of automotive for powder coating with IGBT induction heating system
Objective Heat the steel spring assemblies of automotive seats to powder coat
Material · Steel wire springs ~24” (61 cm) long, 1/8 “ (3.175mm) diameter cross section · Nylon powder
Temperature 500 °F (250 °C)
Frequency 120 kHz
Equipment DW-UHF-40kW, induction heating system, equipped with a remote heat station containing four 1.0 mF capacitors for a total of 1.0 mF
An induction heating coil designed and developed specifically for this application
Process A multi-turn helical coil is wound in a special cross pattern to heat the bottom 1.5 turns of the steel to be coated. This coil efficiency heats the special geometry of the springs. The springs are heated for 10-15 seconds and then soak for another 10-15 seconds before being dipped in the Nylon powder bath. This insures good even flow of the Nylon.
Results/Benefits · Even heating of the spring before dipping provides uniform flow and provides consistent thickness of the nylon coating
· Higher quality end product vs. using an open flame convection furnace. Ovens are sensitive to ambient
temperature and humidity variations and tend to produce uneven results.