METHOD FOR CONTROLLING TIMING FOR CHANGING BILLET WIDTH DURING CONTINUOUS CASTING

摘要

PURPOSE:To stabilize the operation for casting and to improve yield by adjusting the timing for changing billet width beforehand in synchronization with the fluctuation in the billet drawn if the drawing of the billet in conformity with the casting instruction is infeasible during continuous casting. CONSTITUTION:An ingot 5 under casting is detected at all times at the intended cutting lengths of slabs 5a-5c by a computer which controls the timing for changing billet width. The molten metal above a casting mold 3 which is not solidified yet to a billet is also detected as an extension of the intended cutting length for the slab near the lower part of the casting mold. If the intended cutting length L that the slab 5b under continuous casting possesses becomes shorter by a length l, the timing Lx for changing billet width which is detected just before the same is corrected with Lx-l as a fresh Lx1 by the control of the timing for changing billet width and is freshly detected again, whereby the width of the billet is changed without deviation in the position from the slab which is intended to be changed.