METHOD FOR CONTROLLING CHANGE OF MOLD WIDTH IN CONTINUOUS CASTING FACILITY

PURPOSE: To prevent the occurrence of flaw on a cast slab and of breakout by returning hydraulic pressure back to that at the time of the ordinary operation after positioning a short side. CONSTITUTION: The short side 1 of a mold is shifted to a dummy bar head 9 direction with an electric hydraulic servo cylinder 2 and forcedly collided to have the position of the dummy bar head 9 recognized. Then, the slippage between the electrical control position and a mechanical actual short side position is corrected, and the short side 1 is stopped at the position where the mold short side copper plate 8 is apart from the dummy bar by the preset gap distance. Further, before shifting the short side 1 of the mold to the dummy bar head 9 direction, the hydraulic pressure of the electric hydraulic servo cylinder 2 is lowered than the pressure at the time of the ordinary operation, and after positioning the short side 1, the hydraulic pressure is returned back to the hydraulic pressure at the time of the ordinary operation. By this method, the service life of the short side copper plate is not shortened, and the shortening of the service life of the mold can be prevented.