PROBLEM TO BE SOLVED: To prevent or suppress a trouble such as breaking of a rolled material, reduce an off-gauge part as much as possible, and further improve a yield.SOLUTION: A flying plate thickness changing apparatus timely tracks a presently traveling welded point W and acquiring welded point information Dt; calculates transition pattern information Fs corresponding to transition patterns P1 to P18 at each existence position of three change travel points B, W and E for a plurality of stands 1 to 6, from the obtained timely welded point information Dt; monitoring a change in the transition pattern information Fs; and controls each of the stands 1 to 6 to control values Ct on rolling conditions of each of the stands 1 to 6 associated with the corresponding transition patten Ps with reference to the previously set control table Ct, when the transition pattern information Fs is changed.SELECTED DRAWING: Figure 4
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