Control method and device for minimizing residence time of slab in strand

Abstract

The invention provides a control method and device for minimizing the residence time of the slab in the casting stream, which includes: setting a virtual cutting point, the virtual cutting point is set at a fixed position opposite to the slab head of the uncut slab The distance of the length of the ruler; track the solidification end point of the slab through the temperature field tracking model; judge whether the solidification end position of the uncut slab is not greater than the position of the virtual cutting point; if not, set the virtual cutting point as the actual cutting point; If it is larger, the virtual cutting point when the solidification end point of the slab retreats to the distance from the slab head not less than a cut-to-length distance is taken as the actual cutting point; the cutting device is moved to the actual cutting point to cut the slab. The above control method and device minimize the residence time of the slab in the strand.

Description

technical field [0001] The invention relates to the technical field of continuous casting, and more specifically, relates to a control method and device for minimizing the residence time of a slab in a casting stream. Background technique [0002] The direct rolling technology saves the heating furnace process between continuous casting and steel rolling, saves energy consumption and pollutant emissions, and brings significant energy saving and emission reduction effects, thereby reducing the cost per ton of steel and having significant direct economic benefits. [0003] To realize the direct rolling technology, the first thing is to ensure that the temperature of the slab before reaching the rolling mill is high enough to meet the high temperature rolling requirements. In order to achieve this goal, the existing technology has been greatly improved, such as increasing the pouring speed of continuous casting, increasing the cutting speed, increasing the speed of the roller t...

AI Technical Summary

Problems solved by technology

[0006] The traveling speed of the slab in the continuous casting section and the cutting section is completely limited by the casting speed of the casting machine, which is generally less than 4.0m / min, while the speed of the transition roller table section and the conveying roller table section is very high, which can reach 50-300m / min. It is necessary to optimize the cut-to-length slab in the continuous casting section and the cutting section; at the same time, the temperature of the cut-to-size slab in the continuous casting section and the cutting section is relatively high, generally above 1000°C, and the radiation heat dissipation is significant, which can reach 30°C / Min above, but the existing technology can not realize the optimization of this area

In addition, the design of the cutting stroke of the existing cutting transposition only considers that the cast slab can be cut off at the maximum casting speed of the casting machine, and the cutting process is fixed: after the cutting is completed, the cutting device returns to the starting position; After the initial position is equal to the fixed length, clamp the billet and start cutting; until the cutting is completed

Regardless of design or actual operation, under different pouring speeds, the cutting starts from the cutting start position, and the function of reducing the residence time of the slab in the casting stream under different casting speeds cannot be realized

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