Note: Induction forging silver bars to create collectible coins
Objective:
To heat silver bars to 1200 ºF (649 ºC) for a forging application
End Product:
Collectible coin
Equipment:
Ambrell EKOHEAT® 125 kW/3 kHz induction heating system A single position, twenty turn helical coil
Materials:
Silver bar (3”/76 mm diameter, 12”/305 mm long)
Temperature:
1200 ºF (649 ºC)
Frequency:
3 kHz
Testing:
The coil inside diameter (ID) had to be very close to the outside diameter (OD) of the bar due to the high conductivity of Silver. For this reason, conventional water-cooled steel tubes may not work to support the bars as they rest in the induction coil. Consequently, a stainless steel shim was used to support the silver bar in the coil. With the EKOHEAT 125 kW/3 kHz power supply, the silver bar heated to temperature within 60 seconds.
Benefits:
• Fast heating: The client had been using an oven, and induction offered a faster rate of heating
• Efficiency: Unlike an oven, induction offers instant on/instant off heating
• Throughput: Faster heating means greater manufacturing throughput
• Footprint: Induction, with its small workhead that can be placed a distance from the power supply, required less of a footprint
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