Method for controlling hot continuous rolling finish rolling process

Abstract

The invention provides a method for controlling a hot continuous rolling finish rolling process, which belongs to the technical field of automatic steel rolling control. The method is that after the parallel data interface (PDI) data is obtained, according to the technological requirements which are established in a rolling plan, the thickness of a hot continuous rolling finish rolling target outlet and the target temperature of the finish rolling outlet are determined; the practical temperature of a hot continuous rolling finish rolling inlet is obtained; the load distribution of a rack is determined; rolling parameters including the roller linear velocity, inlet temperature, rolling force, roller gap position and motor power parameter of various racks are calculated; the rolling parameters are subjected to limit checking and are judged whether to meet the operation conditions of equipment or not, if yes, the rolling parameters are sent to a control system in a command mode, and the hot continuous rolling finish rolling process is controlled; and if not, calculation is carried out again. Through calculating the rolling force, the prediction precision and the thickness precision are improved, the service cycle of a roller is accurately predicted, based on a roller thermal expansion model, the rolling process has different rolling intervals, and good thickness controlling precision is obtained.

Description

technical field [0001] The invention belongs to the technical field of steel rolling automatic control, and in particular relates to a process control method for hot continuous rolling and finishing rolling. Background technique [0002] At present, the number of hot-rolling mills in my country ranks among the top in the world, and the installed capacity and production capacity of hot-rolled strip steel production lines have reached the international level as a whole. However, only a few large-scale state-owned enterprises have imported advanced computer control systems for wide-band steel rolling lines, which can be fully automated. Production, most small and medium-sized rolling lines still use semi-automated production methods, that is, only basic automation without process automation control system, production efficiency is low, and product quality is generally not high. [0003] Most of the existing process control methods are imported from abroad as a whole, it is diffi...

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Problems solved by technology

[0002] At present, the number of hot-rolling mills in my country ranks among the top in the world, and the installed capacity and production capacity of hot-rolled strip steel production lines have reached the international level as a whole. However, only a few large-scale state-owned enterprises have imported advanced computer control systems for wide-band steel rolling lines, which can be fully automated. Production, most small and medium-sized rolling lines still use semi-automated production methods, that is, only basic automation without process automation control system, low production efficiency, and generally low product quality

[0003] Most of the existing process control methods are imported from abroad as a whole, it is difficult to carry out secondary development, and there are problems such as single data processing method and poor system portability; the model algorithm is relatively single, it is difficult to be universally applicable to each production site, and there is a lack of unity The solution, the model factors are not fully considered, and there is a problem of low thickness accuracy after the roll is stopped and the roll is changed

[0004] Most of the process control systems used in the industry are based on a multi-process structure. Generally, the system has dozens of processes. Since the process integrates the basic unit of resource allocation and the basic unit of CPU scheduling, it has a parallelism in the development of programs. has great limitations

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