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Induction Heating of a Varying Diameter Preform
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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A proposal to use a varying diameter preform for forging the 120-mm M256 gun tube required a modification to the induction heating system power control to provide uniform heating of the preform. In addition, there was a need to automate the heating process for more uniform and consistent heating of constant diameter preforms. Various approaches to modify the control were investigated. A temperature feedback control, determined to be the best type, uses an infrared temperature sensor at the induction coil that sends a signal to a proportional controller. The proportional controller varies power to the induction coil based on the temperature sensed. When the preform reaches the set point temperature, the controller provides just enough power to hold the preform at temperature. Operation of the feedback control has proved successful. It also provides emergency power shutoff if the infrared instrument detects a preform temperature that exceeds a reset limit.
APPROVED FOR PUBLIC RELEASE