| 摘要 |
PURPOSE:To smoothly cope with a residence time change due to cessation, etc. by accumulating slab temp. rising patterns from charging slabs into a heating furnace to extracting them in the form of the ratio of the time elapsed after charging and the predetermined residence time and by controlling the slab temp. according to the date. CONSTITUTION:When slabs 5 are heated in heating furnace 1, the temp. of the i-th zone is detected with slab temp. operator 7, and the temps. of all slabs 5 in the i-th zone are estimated according to the following equation: dtheta/dtau=K(T<4>-theta<4>) wherein theta is slab temp., T is furnace temp., tau is time and K is a coefficient. Next the time elapsed after charging each slab 5 is measured with zero dimensional operator 11, and the time is divided by the predetermined residence time the of slab to calculate zero dimensional time. In accordance with this calculated time the slab temp. of the time is selected from slab temp. pattern accumulator 12 and compared to the output value of operator 7 to obtain the difference. This operation is performed with respect to all slabs 5 in the i-th zone to calculate the mean value of differences in temp. of the slabs, and the temp. of the i-th zone is changed according to the value. |
