JPS6415203A - Manufacture of t-shape steel and similar shape steel - Google Patents

Abstract

PURPOSE:To eliminate melting cut and restraightening and to reduce the manufacturing period of time by notching the web, separating a stock into two pieces at the notched part, twisting the two bar stocks by twising guides to be bitten in the same position, and introducing to a finishing, correctly forming pass. CONSTITUTION:A stock is heated, is rolled into a rough H-shape by a breakdown mill BD, then is subjected to reciprocative rolling by a group of edgers E1 and universal mills U1 to screw down a flange width, web thickness, and flange thickness. T-shape steels separated into two bars are obtained by one pass of respective groups of edgers E2 and universal mills U2 as finishing rolling. The universal mills U2 are a slit pass and separated two (a, b) T-shape bars whose web thickness and flange thickness are screwed down and a notched part (S part) is sheared to separate. The separated two T-shape steel bars of (a, b) are twisted by guides at the outlet side of the U2 to be the same biting position shown by E3 (or U3) in the illustration and the slit cut face is rolled and correctly formed by the E3 (U3).