| 摘要 |
PURPOSE:To increase the web inside dimension of shape steels such as H-shape steels having a web and flanges by on-line working by constructing horizontal rolls of a universal mill so that a roll body width is freely changeable in the axial direction and rolling a rolled stock with a width of the body sequentially expanded during reverse rolling. CONSTITUTION:An upper horizontal roll 41a and a lower horizontal roll 41b are freely movable in the axial direction; a stock 5 to be rolled having a web inside dimension WF shows a section of an intermediate rolled stock; the thickness of a web and flanges of the stock 5 is made to be nearly equal to that of a prescribed product and the web is formed a little thicker web in accordance with a web width expansion amount. In a 1st pass in finish rolling, the stock 5 is spread rolled with a body width WF1 of the upper and lower horizontal rolls 41a, 41b expanded a little larger than the web inside dimension WF. Right and left vertical rolls 6a, 6b retract by an optional distance (t) not to draft a flange faces 5a. In a 2nd pass, the stock 5 is rolled with the body width of the rolls 41a, 41b expanded to the position of imaginary lines WF2. In a 3rd pass, the vertical rolls 6a, 6b are pressed onto the flange faces 5a to eliminate a flange taper theta, to make the angle between the web and flanges rectangular, to correct the shape of the stock 5, and to roll the flanges. |
