METHOD FOR INSPECTING METALLIC PLATE SURFACE AT FOLLOWING STAGE IN ACCORDANCE WITH FLAW INFORMATION BEFORE COLD ROLLING

PURPOSE:To balance operating speed with inspecting speed by grasping a plate length and a flaw position of a coil in a line after the flaw is inspected and reducing the speed automatically when the flaw passes through an inspection position at the rear. CONSTITUTION:As the coil is pickled 26 in a pickling line 1, it is inspected by an inspection instrument 2, a serious flaw is cut by a cutting machine 15, a part to require careful operation in a rolling time is marked by a marking device 20 and coiled by a coiler 3 to grasp each data by a controller 6. A flaw position data is transmitted to a controller 18 through a transmission system 7 and the part to require careful operation in a rolling time is dealt with automatic reduction of speed. A correction of length at the flaw part generated by rolling is transmitted to the controller 7 and a command for automatic reduction of speed is given to a passing device 11 when the flaw position reaches the inspection instrument 10. The flaw position is marked by a marking device 13 and cut by cutting machine 15 in accordance with the inspection result of the inspection instrument 10.