| 摘要 |
PURPOSE:To attain a rolling method capable of separetely manufacturing the web height of an H-beam without defect in shape. CONSTITUTION:In a rolling method of shapes by an equipment installed with a 2-high rolling mill in which barrel width varying mechanisms are equipped adjacently to an intermediate rolling stage between the intermediate rolling stage II and a finishing state III, excess metal parts 18 whose cross-sectional shapes in the direction of width consist of the combination of circular arcs having different radii of curvature are formed in both end parts of a web 2a with the horizontal rolls 2H of an intermediate universal mill RU. And, after forming the outside inclined angle theta of the flange 1a in the range of the next inequality: sin<-1>(DELTAW/(F-tw)<=theta<=tan<-1>(DELTAW/2hr), the web height is widened while rolling down the excess metal parts with rolls R2Hi whose cross-sectional shapes in the direction of barrel width of excess metal rolling-down surfaces are smoothly formed by combining circular arcs of different radii. In this way, the property of biting between rolls is improved, large widening rolling is enabled, also the distribution of tensile plastic strain in the direction of web width is uniformized and constriction is suppressed. |
