| 摘要 |
PURPOSE:To prevent the generation of web waving and to produce a wide flange beam having a large thickness ratio by maintaining the surface of horizontal rolls for rolling the thin-walled part of H-shape steel at a prescribed temp. and executing rolling. CONSTITUTION:A universal mill is constituted of the upper and lower horizontal rolls 1, 2 and right and left vertical rolls 3, 4. Heaters 11, gas ejection nozzles 12 and radiation thermometers 13 are provided to the barrel parts of the rolls 1, 2 for rolling the web. The surface temp. of the horizontal rolls is measured by the thermometers 13 during rolling and is maintained at a constant temp. by heating the roll surface with the heaters 11 or subjecting said surfaces to gas cooling with the nozzles 12. The generation of the web waving arising from the temp. drop by heat transmission is, therefore, prevented and the H- shape steel having 4.5mm web thickness and 7mm flange thickness is produced. |
