| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of processes and the period of production so as to make a T-steel efficiently by decreasing residual stress of an H-steel, applying web cutting or preliminary working to it, correcting its shape vertically and horizontally, and thereby securing the post-cutting straightness of T-steel. SOLUTION: A light screw-down type universal rolling mill 10 removes residual stress while rolling down the root of the web of an H-steel 1 through the reduction by its vertical roll 12, and also cuts the web by the pre-working roll. A roller straightener 20, performing repeated bend and left/right bend by the upper and lower rolls while pinching the web and flange by the horizontal rolls 21, 22 and the vertical roll 23, cuts the web, straightens the T-steel thus cut to produce a cut T-steel. In addition, with the purpose of fully demonstrating this effect, the light screw-down type universal rolling mill 10 is equipped with a driving unit 15 and a reduction gear 16, as is the roller straightener 20 with a driving unit 25 and a reduction gear 26, so that both driving units 15, 25 are properly controlled. |
