Method for improving coiling temperature control accuracy of hot rolled new-variety new-specification band steel

Abstract

The invention discloses a method for improving coiling temperature control accuracy of hot rolled new-variety new-specification band steel and belongs to the field of control. The method includes that an on-site control computer dynamically controls production running parameters of production equipment in a hot rolling laminar flow cooling process according to a coiling temperature control model, a released product task and production process indicators; key production process information like band steel type, target thickness, target coiling temperature, rolling speed and band steel cooling mode are combined in a hot rolling laminar flow cooling control process; whether incoming materials from a previous process belong to new variety or new specification or not in a current process is automatically judged; model parameters of the new variety or the new specification in the current process during first-time production are automatically determined through a series of presumption logic so as to improve coiling temperature control accuracy and control qualification rate during first-time production of the band steel of the steel type or the new specification by the current process and lower 'waste, defective and downgraded rate in the process of first-time production to lower product manufacturing cost. The method can be widely used for the field of control on the hot rolling laminar flow cooling process.

Description

technical field [0001] The invention belongs to the field of control, in particular to an automatic control method for the production process of hot-rolled strip steel. Background technique [0002] Laminar cooling is an important process in the hot rolling production process. Its main function is to cool the strip from a certain final rolling temperature to the required temperature by controlling the dynamic opening and closing of the water spray valve in the laminar cooling area after the strip is rolled. Target coiling temperature. [0003] Because the coiling temperature has a great influence on the physical properties of the strip, the actual coiling temperature of the finished strip must be controlled within a certain target tolerance range, otherwise the finished strip may be "rejected" or "downgraded" Use, resulting in lower product qualification rate, increased production costs. [0004] In order to improve the control accuracy of the strip coiling temperature, th...

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Problems solved by technology

[0010] For the first-time production of new varieties or new specifications, the mathematical model of the coiling temperature control can only be calculated with default parameters, resulting in a generally low accuracy hit rate for the first production. Generally, the accuracy of ±30°C (actual coiling temperature The deviation from the target coiling temperature is within 30°C, the same below) is less than 80%, and the partial or even overall coiling temperature of the strip is "out of tolerance", causing the coiling temperature to be "waste, second, drop"

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