| 摘要 |
<p>PURPOSE:To decide the initial passing speed so that the temp. in the head part of a rolled stock falls stably in the range of the tolerance of control temp. even in the case the operating conditions are varied or the estimation of the temp. on the outlet side of finishing mill is difficult. CONSTITUTION:By measuring and checking respective differences of (1) an arrival time (hour deg. minute' second'') at the hot roughing mill on the final stage, )thickness (mm) on the outlet side of the roughing mill on the final stage, (3)target thickness (mm) of product, (4) temp. ( deg.C) of the rolled stock at the time of arriving at the roughing mill on the final stage, (5) target tensile strength (kg/mm<2>) of product and 06 target temp. ( deg.C) in the head part of the rolled stock when the rolled stock is passed through the finishing mill, whether the initial passing speed of a rolled stock which is formerly rolled is taken as a reference or the initial passing speed of the typical rolled stock is taken as a reference is decided. By correcting the initial passing speed by differences regarding the temp. of each case, the initial passing speed that is fallen in the range of the tolerance of control temp. is attained.</p> |
