| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent remaining of scab onto a thick steel plate after cutting off a crop by judging whether a crop length at the front part of the thick steel plate at the time of rolling is in a specific range or not to control the position of the scab. SOLUTION: After broadside-rolling a slab according to a preset rolling schedule, a finish-rolling is executed to produce the thick steel plate. Whether the crop length Lc obtd. with the equation at the front part of the thick steel plate at the time of rolling is in the range of 100-150mm or not, is judged. In the case the crop length Lc is out of the range, the width rolling reduction load in an edging with the vertical roll in the finish-rolling is controlled so that the crop length Lc becomes in the range of 100-150mm. In the equation, wherein,ϕis the broadside rolling ratio in the finish-rolling,λis a length extending ratio in the finish-rolling and F is a total width rolling reduction load per unit thickness in each pass in the edging at the finish-rolling.</p> |
