| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress the occurrence of surface flaws apt to be formed particularly in the unsteady part in a bar steel rolling stock. <P>SOLUTION: A method for rolling a bar steel rolling stock is provided in which by various apertures 4 provided at a pair of rolls 3 in a plurality of rolling stands 2 arranged at prescribed intervals, a bar steel rolling stock 1 is successively rolled in a divided plurality of passes, thus the cross-sectional area of the bar steel rolling stock 1 is successively reduced and the bar steel rolling stock 1 is finished into a prescribed product shape. The method is characterized in that the width dimensions of the bar steel rolling stock 1 are measured by a width dimension measuring apparatus 5 arranged at the outlet side of the objective rolling stand 2a, and the width dimensions are controlled to the range of allowable width dimension value preobtained in such a manner that the compression strain in the circumferential direction of the bar steel rolling stock 1 becomes≥-0.5 by rolling in the objective rolling stand 2a. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
