| 摘要 |
PURPOSE:To quench a metallic pipe at a uniform cooling speed, by blowing jet water into a metallic pipe of a high temperature from its one end, executing its cooling, also controlling and jetting jet water over the full length from the outside surface, and correcting uneven distribution of cooling of the inside surface. CONSTITUTION:A metallic pipe to be quenched 1 of a high temperature is placed horizontally on a supporting roll group 2 and is rotated. From a nozzle group 3 placed linearly in the upper direction of the metallic pipe 1, laminar flow cooling water is dropped onto the top line of the metallic pipe 1, the outside surface is cooled, also a jet flow is blown into the metallic pipe 1 toward the other end B from its one end T, and the inside surface is cooled. As for the inside surface cooling, its cooling distribution becomes uneven because a temperature rises as the jet water approaches the other end B of the discharge side. In order to correct this unevenness, a header 4 of said nozzle group 3 is divided into plural pieces, and one of such 3 methods as the quantity of jet water is increased as it approaches the end B side, by controlling the outside surface cooling, the action that its cooling start time is quickened, or its cooling end time is delayed is executed. |
