| 摘要 |
<p>PURPOSE:To control the length of a pipe to a prescribed value and to improve the control accuracy of length by adjusting the rotating speeds of rolls of every stand from the preset sectional area and actually measured value of the pipe for each of the stands determined by a rolling schedule. CONSTITUTION:The sectional area of the pipe is preset by each of the stands to determine a reference pattern. A billet weight is measured with a weight meter 2 and the length of the base pipe 4 is actually measured by a length measuring gage 5 on the inlet side of a stretch reducer 6. The ratio between a reference value Loe and actually measured value Le on the inlet side and the ratio of the reference value Lod and actually measured value Ld on the outlet side of the stretch reducer 6 are determined. The rotating speeds of the rolls of the respective stands are determined from the equation on the basis of such values and the control is executed. The length control accuracy of the pipe is improved by the above-mentioned method.</p> |
