| 摘要 |
PURPOSE:To reduce the number of pass, prevent bending, and raise the efficiency of rolling by making early molding by applying a drafting to horizontal roll and one vertical roll every pass and also by fixing the other vertical roll at kissing or a definite position on the horizontal roll side all the time. CONSTITUTION:To prevent the protrusion of the web side @ portion of metal to be rolled, a square sectional shape of the steel piece or cast piece 17 is molded in advance by a double hole type rolling mill consisting of the horizontal rolls 20 and 21, and the metal 22 to be rolled, the shouldder portion (corresponding to the web side @ portion) of which is removed, is molded and rolled by an universal rolling mill while fixing the vertical roll 15 at a certain position all the time and also while drafting the vertical roll 16 every pass to obtain crude product. Thus, the position at which the web side and the vertical roll 15 meet each other is kept constant in making rolling and therefore high quality and bend-less product can be obtained without protrusions on the web side @ portion. |
