| 摘要 |
<p>PURPOSE:To improve the comprehensive dimensional accuracy of a bar material, by using a measuring instrument for measuring a cross-sectional shape of the bar, and respectively recognizing vertical, horizontal, and diagonal dimensions of it for correcting the rolling reduction of a rolling mill at the final stage. CONSTITUTION:An angle detector 13 outputs the signals of an angle rotated from a standard angle and an angle rotated by 180 deg. from the rotated angle. The values of diameters of a wire rod material are detected at 30 points while the bar is rotated by a half revolution, and are inputted to an arithmetic device 9. When a vertical diameter H0, a horizontal diam. B0 and a diagonal diam. L0 are obtained, the deviations DELTAH0, DELTAB0, and DELTAL0 between said diameters and a target diam. D0 are also obtained. By using the relation between the change of rolling reduction of the last mill on the downstream which is previously obtained and the changes of horizontal, vertical and diagonal diameters, the changing quantities of horizontal, vertical and diagonal diameters obtained by adding the change of rolling reduction are added to said deviations, to calculate the estimated deviation from respective target values. The dimensions of the round bar are controlled by controlling the rolling reduction so that the maximum value of these three deviations becomes minimum.</p> |
