| 摘要 |
PURPOSE:To produce multiple grooves of billets of extremely less variances in dimensions and good surface quality simultaneously by repeating rolling by the alternate use of a universal rolling mill having horizontal rolls and vertical rolls and a shaping rolling mill. CONSTITUTION:The blank material 7 rolled to a prescribed rectangular section with a breakdown rolling mill 19 is guided to the center of horizontal rolls 26, 26' by means of the vertical rolls 27, 27' of a universal rolling mill 20, and is formed with grooves on the top and bottom surfaces by crests 24. Thence, the material 7 is gnawed into the rolls 28, 28' of a shaping rolling mill 21 with the above-mentioned grooves as the guide grooves, and receives mainly the rolling in corner parts 29. Thence, the material 7 again receives the rolling with the mills 20, 21 repeatedly, and is formed to a prescribed sectional shape, after which the connecting parts are cut by a separating device 22, whereby desired plural billets are produced. According to this method, the products of extremely less variances in sizes and good surface quality are obtained. |
