| 摘要 |
<p>PURPOSE:To mold an intermediate material different in web height without recombining a roll into another one by preventing generation of web wave and giving molding caliber function of a rough double caliber mill to a rough universal mill. CONSTITUTION:In the rough stage universal mill, both web and flange commence rolling down simultaneously under such a condition that the web wave does not occur. At this time, before the flange begins being rolled down, both the central line and the central line between horizontal rolls 61, 62 are agreed by the web to mold the intermediate material 54 having the accuracy of the web central position equal to that of the molding caliber. Then, a pass web draft rW and a flange draft rF are controlled in accordance with the inlet side web thickness tW of each pass, the inlet side flange thickness tF and a horizontal roll diameter DH, a horizontal roll barrel width II, a vertical roll diameter DV so that the following expressions I, II are satisfied. DHrWtW @DVrFtF... (I) In {(1-rF)/(1-rW)}<29{tW(1-rW)/U}<2>...(II).</p> |
