| 摘要 |
<p>PURPOSE:To accurately cut a joined part and to improve the yield and productivity by coating a place to be cut on a steel material with paint on the inlet side of a rolling mill, continuously measuring radiation energy of the surface of the steel material on the outlet side of the rolling mill and detecting a cutting position through the change of the radiation energy. CONSTITUTION:The rear end of a preceeding rolled steel material and the tip end of the following rolled steel material are joined by a joining device 14 before they enter a finishing mill 10. Immediately after it, the joined part is coated by a paint spray gun 16 with paint. Surface temperatures of the steel material are measured by a radiation thermometer 18 continuously on the outlet side of the finishing mill. At this time, since an apparent temperature falls at the coated part only, by which it is decided to be a joined part and cut by a cutting machine 20.</p> |
