Multi-mode continuous casting and rolling control method for plate strip

Abstract

The invention discloses a multi-mode continuous casting and rolling control method for a plate strip, and belongs to the field of short-process rolling of iron and steel metallurgy. According to the multi-mode continuous casting and rolling control method for the plate strip, process reengineering coordination mechanisms are fused, a swing-type plate shear, a tunnel furnace, a descaling box, an equipment unit and an endless rolling technological process are reengineered, transient mutation and dynamic regulation change of a finishing rolling unit are technically cascaded, a roller of the finishing rolling unit is replaced on line without shutdown, fully-continuous production is guaranteed, the surface quality of an endless rolled plate strip is optimized, temperature uniformity control inthe rolling process is improved, procedure configuration is more coordinated and flexible, a flexible rolling production mode is achieved, the coverage range of the product thickness is broadened, theactive regulating ability to transient mutation in the continuous rolling production process of the plate strip and the flexible manufacturing level are improved, the product quality of the endless rolled plate strip and production full continuity are improved, and the multi-mode continuous casting and rolling control method for the plate strip is of great significance in the aspects of promotingtransformation and upgrading and green development of the field of short-process rolling of iron and steel metallurgy, expanding the advantage supply, optimizing production line configuration and thelike.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy short-process rolling, in particular to a strip multi-mode continuous casting and rolling control method. Background technique [0002] The iron and steel industry is an important basic industry in the country, and strip products are the most important products in the iron and steel industry. Continuous strip rolling is a typical continuous, nonlinear and strongly coupled process industry. At present, the continuous automation of strip rolling at home and abroad is relatively high. The ultimate goal is short process, near-net shape, highly automated and intelligent. Endless rolling is the cutting-edge technology in the field of short-process hot-rolled strips at home and abroad. It has compact technology, low equipment investment, and high yield. Endless rolling process such as figure 1 As shown, continuous casting → rough rolling unit → pendulum shear → induction heating → descaling box ...

AI Technical Summary

Problems solved by technology

[0002] The iron and steel industry is an important basic industry in the country, and strip products are the most important products in the iron and steel industry. Continuous strip rolling is a typical continuous, nonlinear and strongly coupled process industry. At present, the continuous automation of strip rolling at home and abroad is relatively high. The ultimate goal is short process, near-net shape, high automation and intelligence. Endless rolling is the cutting-edge technology in the field of short-process hot-rolled strips at home and abroad. It has compact technology, low equipment investment, and high yield. Endless rolling process such as figure 1 As shown, continuous casting → rough rolling unit → pendulum shear → induction heating → descaling box → finishing rolling unit → laminar cooling → flying shear → coiling, because the endless rolling technology is to rigidly connect the continuous casting and rolling line , the production equipment process has excessive rigid connection, sacrifices system flexibility, and lacks the ability to respond to transient changes in the equipment system. There are mainly the following three problems in the production process. First, the wear of the rollers of the finishing rolling unit of the endless rolling technology leads to frequent shutdowns The bottleneck problem of roll change restricts its technical performance. During the rolling process, the rolls of the finishing mill are severely worn and the rolls are changed frequently. During the roll change of the downstream finishing mill of the endless rolling, the upstream continuous casting cannot continue, and the production line stop, seriously affecting the continuity and production efficiency of endless rolling production

Second, the current endless rolling technology does not set up a phosphorus removal process before the rough rolling process, resulting in more oxide scales in the strip production process, which affects the surface quality of the product

The third is that only induction heating is used in the intermediate heating process, resulting in non-uniform temperature distribution of the strip, which affects the structure and performance of the product

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