| 摘要 |
<p>PURPOSE:To prevent generation of material defects in ends in the length direction of a sheet bar by stopping transfer of the bar or reducing a transfer speed of the bar in a heating zone and shifting an induction furnace in the width direction of the bar. CONSTITUTION:At the time when the top of a sheet bar 3 arrives at a top end detector 25, the detector 25 outputs a theoretical value signal showing arrival of the top of the bar 3 to a controller 21. Then, a temp. sensor 26 starts temp. detection to detect a temp. of the top of the bar 3 and sends the detection signal to a controller 21. Next, the controller 21 calculates a difference between the measured top end temp. of the bar 3 and a target temp. and controls outputs of a high frequency power source 27 based on a detected speed value of the bar 3 detected by a speed detector 24. An induction heat oil is shifted with an approach limit distance of the coil kept. As the result, the top of the bar 3 over the entire area in the width direction is heated by the induction heating coil and temp. drop in the top end is compensated.</p> |
