JPS56151154A - Control method for changing of casting speed in continuous casting plant - Google Patents

Abstract

PURPOSE: To stabilize solidification completion points by comparing the estimated values calculated by inputting actually measured values to an arithmetic unit with the patterns of the solidification completion points, and controlling casting speeds.

CONSTITUTION: In case a considerable change in speed is intended such as at the start or end of casting, a solidification completion point pattern setter B having beforehand been set with the change patterns of the prescribed solidification completion points is operated. Also, there are the target surface temperatures corresponding to the solidification completion point patterns, and a setter D for these is operated. If the outputs of the setters B, D are defined as Lt, θt, respectively, Lt and solidification completion point position estimation L' are operated by a comparing arithmetic controller M, and ingot surface temp. estimation θ' and θt by a comparing arithmetic controller N. Thence, a control output is applied as a set value from the controller M to a cast speed controller Q. Likewise, the output is applied from the controller N as a set value to a cooling water flow rate controller R. By the above, the smooth movement of the solidification completion point position and the assurance of the ingot surface temp. are easily achieved.

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