| 摘要 |
<p>PURPOSE:To improve the quality of vicinities of length direction ends and the product yield of a sheet bar by installing induction heaters at upper and lower positions of the sheet bar and heating vicinities of the length direction ends of a stopped sheet bar through a high frequency electric source. CONSTITUTION:Upper and lower induction heaters 6 having magnetic poles 62 are installed for a hot sheet bar 3, respectively. The heaters 6 are connected to a high frequency electric source 27 and a driving device 22. At the time of arrival of the top part of the bar 3 at a top part detector 25, a controller 21 detects the arrival and the heaters 6 are separated from each other to avoid generation of cambers of the bar 3. Then, the bar 3 is stopped in a project area of the downstream side magnetic poles 62, an output of the source 27 is controlled, and the heaters 6 are shifted in the width direction of the bar 3. Hence, generation of material defects in vicinities of the length direction ends of the bar 3 is prevented. The quality and yield are improved because a discarding area at ends is reduced.</p> |
