Secondary cooling water amplitude-cutting control method of slab continuous casting machine

Abstract

The invention provides a method for carrying out online automatic accurate amplitude-cutting control on spraying width of secondary cooling water of a wide and thick slab, belonging to the technical field of control over cooling water for continuous casting and aiming at overcoming the defects of large engineering modification of a cooling water supply loop, higher cost or poorer control precision of manually adjusting spraying width and the like existing in the prior art. The method mainly comprises the following steps of: taking secondary cooling water spraying widths of different steel types and different width specifications of casting blanks, which are determined through temperature field simulation computation of secondary cooling water regions of the casting blanks and field tests,as references, driving a guide device mainly consisting of a support frame and a collecting guide pipe to collect and guide out redundant cooling water which is sprayed from spray pipes at edge partsof rows of the inner arc of the sector section so as to realize online accurate amplitude-cutting to spraying width of the secondary cooling water of the inner arc of the sector section. Due to adoption of the method disclosed by the invention, temperature of the corner of a continuous casting blank can be stably controlled at 870-900 DEG C, a third brittleness temperature region of steel is effectively avoided, the micro transverse crack defect rate of the corner of the micro alloy steel continuous casting blank is controlled within 1 percent.

Description

technical field [0001] The invention belongs to the technical field of continuous casting cooling water control, in particular to the online adjustment technology of cooling water spray width. Specifically, it refers to a method for controlling the width of the secondary cooling water spray in the inner arc of a wide-thick slab continuous caster on-line. technical background [0002] The wide and thick slab continuous casting machine has the characteristics of large section, low casting speed, etc., and has the ability to cast continuous casting slabs with multiple specifications. Tube cooling system, using cooling water sprayed onto the surface of the slab for cooling. In the actual continuous casting production process, on the one hand, due to the characteristics of wide and thick slabs with large cross-sections, in order to ensure that the slabs do not produce bulging behavior during the continuous casting production process and to realize the effective elimination of th...

AI Technical Summary

Problems solved by technology

[0009] In order to effectively realize the online precise width cutting control of the cooling water spray width of each sector of the secondary cooling, the present invention can achieve the over-straightening high temperature at the corner of the continuous casting slab, avoid the third brittle temperature zone of the steel and improve the overall cooling effect of the continuous casting slab In order to overcome the shortcomings of existing inventions, such as the large amount of engineering transformation of the cooling water supply circuit, the high cost, or the poor control accuracy of manual adjustment of the spray width, which cannot meet the high-efficiency production of continuous casting today, a wide and thick plate is proposed. On-line Automatic and Precise Width Cutting Control Method of Billet Second Cooling Water Spray Width

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