Note: Heating a Nitinol spring assembly for shape setting
Objective:
To heat a nitinol spring assembly to 800 °F (426.6 °C) for shape setting application
End Product:
Nitinol spring
Equipment:
Ambrell 5.0 kW induction heating system, equipped with a remote workhead containing two 1.5 μF capacitors for a total of 0.75 μF
An induction heating coil, designed and developed specifically for this application
Materials:
0.018 in (.457 mm) Nitinol wire wrapped around a 0.08 in (2.03 mm) Nitinol mandrel 15 in (381 mm) long
Temperature:
800 °F (426.6 °C)
Frequency:
270 kHz
Testing:
A six-turn split helical coil is used to heat the nitinol wire assembly to 800 °F (426.6 °C). The assembly is pulled through the coil at a steady rate to evenly heat a 1/2 in (12.7 mm) section of wire continuously in 4-5 second.
Benefits:
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Hands-free heating that involves no operator skill for manufacturing
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Even distribution of heating along the wire
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Wire is heat treated on the winding machine, eliminating a secondary process
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Desired heat treating temperature can be adjusted by varying the time the wire assembly spends in the coil
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