METHOD FOR CONTROLLING SHEET THICKNESS IN HOT CONTINUOUS ROLLING MILL

摘要

PROBLEM TO BE SOLVED: To improve the precision of a sheet thickness in a hot rolling by using sheet velocity at the inlet side, sheet thickness at the inlet side and sheet velocity at the outlet side in a downstream side stand calculated from angle and angle velocity of a looper and sheet velocity at the outlet side in an upstream side stand, calculating the sheet thickness at the outlet side in the downstream side stand with a mass-flow constant rule and controlling to a target sheet thickness. ;SOLUTION: The inlet side sheet thickness in the downstream side stand 20_i+1, the outlet side sheet velocity in the upstream side stand 20_i and the outlet side sheet velocity in the downstream side stand 20_i+1 in a hot continuous rolling mill constituted of plural rolling stands 20_i, 20_i+1 providing roll velocity control devices 32_i, 32_i+1 and rolling reduction positional control devices 30_i, 30_i+1, and the looper 22, are used to calculate the outlet side sheet thickness in the downstream side stand 20_i+1 with the mass-flow constant rule. The outlet side sheet velocity in the upstream side stand 20_i is corrected so that the outlet side sheet thickness in the downstream side stand becomes the target sheet thickness by using the looper angle θ and the looper angle velocity ω arranged between the upstream side and the downstream side stands 20_i, 20_i+1, and the outlet side sheet thickness in the downstream side stand 20_i+1 is calculated and then, the precision of the sheet thickness can be improved.;COPYRIGHT: (C)1998,JPO