Induction Heating Nitinol spring
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Objective To heat a nitinol spring assembly to 800ºF (426.6ºC) for shape setting application
Material 0.018” (.457mm) Nitinol wire wrapped around a 0.08” (2.03mm) Nitinol mandrel 15” (381mm) long
Temperature 800ºF (426.6ºC)
Frequency 270 kHz
Equipment • Power of 6 kW induction heating system, equipped with a remote workhead containing two 1.5μF capacitors for a total of 0.75μF
• An induction heating coil, designed and developed specifically for this application.
Process A six turn split helical coil is used to heat the nitinol wire assembly to 800ºF (426.6ºC). The assembly is pulled through the coil at a steady rate to evenly heat a 1/2” (12.7mm) section of wire continuously in 4-5 second.
Results/Benefits Induction heating provides:
• Hands-free heating that involves no operator skill for manufacturing
• Even distribution of heating along the wire
• Wire is heat treated on the winding machine, eliminating a secondary process
• Desired heat treating temperature can be adjusted by varying the time the wire assembly spends in the coil.
Heating Nitinol spring
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