Ultrafast cooling control method for H-shaped steel

Abstract

The invention discloses an ultrafast cooling control method for H-shaped steel, and belongs to the technical field of steel rolling automatic control. A system adopted comprises a universal mill control unit and an ultrafast cooling control unit, wherein the universal mill control unit comprises a process control computer, a programmable logic controller (PLC) and a universal mill (UF); and the ultrafast cooling control unit comprises a process control computer, a programmable logic controller (PLC), a hot metal detector, a thermodetector and a pneumatic butterfly valve bank. By the invention, an ultrafast cooling control strategy, namely valve bank opening priority, is determined according to process requirements such as the type, specification, final cooling target value and the like ofthe H-shaped steel, and the finished rolling speed in steel biting and steel throwing is strictly controlled, so that the H-shaped steel passes through an ultrafast cooling area at a constant speed; and a mathematical model for the ultrafast cooling process is established, the temperature of a flange and a web is accurately controlled, the ultrafast cooling temperature control accuracy for the H-shaped steel is greatly improved, and through self-learning of the model, the ultrafast cooling process is more reasonable and reliable, the H-shaped steel can be subjected to controlled cooling stably at a high speed, and the horizontal and longitudinal cooling uniformity can be ensured.

Description

technical field [0001] The invention relates to the technical field of steel rolling automatic control, in particular to an ultra-fast cooling control method for H-shaped steel. Background technique [0002] At present, the ultra-fast cooling mechanical equipment for large-scale H-beam rolling has been used in production. The equipment is equipped with side nozzles along both sides of the rolling production line, and the cooling of the H-beam flange is controlled by the opening and closing of the valve group. The upper nozzle is installed on the elbow. Above, the elbow is connected to the side water supply pipe to cool the upper R angle of the H-beam and the upper surface of the web, and the lower nozzle is installed under the output roller table of the universal rolling mill to cool the lower R angle of the H-beam and the lower surface of the web. To achieve the purpose of improving organizational performance. However, when the automatic control system of this equipment ad...

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Problems solved by technology

[0003] (1) When the upper and lower valves on the web are controlled by a pair, due to the problem of water accumulation in the web, it is very easy to cause defects in the internal and external expansion of the H-beam, and even fail to pass through the straightening machine; and only the lower valve group is opened to cool the web. When the plate is thicker, its cooling capacity is seriously insufficient;

[0004] (2) Due to the cooling process of the web and the R angle, the lower sprayed cooling water flows back to the water supply system along the drainage groove under the roller table, but during the cooling process of the upper surface of the web plate and the upper R angle by the upper sprayed cooling water, due to the cooler There is water purging at the inlet and air purging at the outlet, so the residual cooling water cannot be discharged in time

Therefore, it is impossible to establish an accurate and effective cooling model for this nonlinear problem

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