| 摘要 |
PROBLEM TO BE SOLVED: To provide a sizing and rolling method by which high dimensional accuracy is obtained over the entire length of a wire rod by especially properly controlling repletion into a caliber before the final roll stand in the hot finish rolling process in a sizing mill for bar steel such as the wire rod and a steel bar. SOLUTION: In the finish rolling in a two-way roll type sizing mill having at least two roll stands which are installed on the poststage side of a finishing mill, a rolled stock 5 is made so as to be subjected to reduction in the top and bottom parts A1 of the caliber which is in the range of at least 50°in the central angle (2θ) on both sides of the axis of symmetry of the caliber in the direction perpendicular to the roll axis of the caliber G of one roll stand (F-1) this side of the final roll stand (F) of the sizing mill. As a result, the shape of the rolled stock 5 along the shape of this caliber is maintained by parts that are not brought into contact with the caliber at the finish rolling at low reduction of area in the final roll stand (F) and the high dimensional accuracy is obtained because the twist of the rolled stock 5 is prevented. COPYRIGHT: (C)2007,JPO&INPIT
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