ROLLING METHOD OF BAR STEEL

摘要

PURPOSE:To permit easy schedule change and to decrease loss time by shifting the molding caliber meeting a product size in an axial direction in such a way that the caliber coincides with a pass line and rolling the material in a flat part in an upper stream stand. CONSTITUTION:A caliber F3 for finishing of a roll R8 is newly made to coincide with a pass line PL in the stage of producing a product W3. Rolls R6, R7 are shifted to make the flat part 30 of the roll 6 and the caliber L2 prior to finishing of the roll R7 to coincide with the pass line PL; further, the gap of each roll and guide gap are changed. A billet is successively drawn by the rolls R3- R6 and is subjected to working prior to finishing by the roll R7 and finishing by the roll R8 and thereafter the billet is taken out as the product W3 on the outlet side of the roll R8.