Medium plate laminar cooling chain edge part shading device control method

A technology of a shielding device and a control method, which is applied in the direction of temperature control, etc., and can solve the problem of large temperature difference in the width direction of the steel plate, etc.

Inactive Publication Date: 2009-08-12
NORTHEASTERN UNIV
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Problems solved by technology

[0004] In order to solve the problem of large temperature difference in the width direction of the steel plate in the cooling process after rolling, the present invention provides a control method for the chain-type edge shielding device of the medium-thick plate laminar flow cooling, and establishes a control method for the chain-type edge shielding device of the medium-thick plate

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  • Medium plate laminar cooling chain edge part shading device control method
  • Medium plate laminar cooling chain edge part shading device control method
  • Medium plate laminar cooling chain edge part shading device control method

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Embodiment Construction

[0091] The setting steps of the control method of the edge masking device are as follows: Figure 7 As shown, taking the steel plate with furnace number 3C5791P32_1 as an example, the specific implementation method is as follows:

[0092] (1) The specific specifications of 3C5791P32_1 are as follows: the steel type is Q345C, the width is 2000mm, and the thickness is 20mm. The starting cooling temperature is 830°C, and the final cooling target temperature is 650°C. First of all, according to the steel type layer, thickness layer, width layer, opening and cooling temperature layer and water flow density layer, the corresponding long-term self-learning coefficient f of the steel plate read in the self-learning file L =0.88, since this steel plate is the first steel plate of the same specification, so select f L A self-learned correction factor calculated as an edge shading setting. Before being replaced with steel plates of other specifications for rolling, the remaining steel...

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Abstract

A control method for a middle thickness plate laminar cooling chain edge masking device is disclosed, belonging to the field of rolling automatic control technology and comprising the following steps of: (1) determining a basic value MB of the amount of middle thickness plate laminar cooling chain edge masking; (2) correcting the masking amount with MB' being equal to MB.f(3); calculating the masking amount Mi of each group of opening manifolds; (4) implementing the masking amount of the single manifold; and considering that a masking baffle plate moves to a set masking location when a moving pulse Iact of the i group of manifold is equal to a target setting pulse Ind of the i group of manifold, in order to realize accurate positioning for the masking device of single group of manifold. The invention can achieve accurate control for the location of the edge masking baffle plate of the single group of manifold; a masking policy model takes parameters like thickness of steel plate, width of steel plate and cooling water amount into consideration, and has high model setting accuracy; the method can compensate and correct the system effectively and improve uniformity of controlling width temperature of the steel plate. The invention is suitable for hot-rolling middle thickness plate and laminar cooling device after rolling.

Description

technical field [0001] The invention belongs to the technical field of steel rolling automatic control, and relates to a method for controlling temperature uniformity in the width direction of a steel plate during the laminar flow cooling process of a medium-thick plate. Background technique [0002] Cooling uniformity control is an important issue in the controlled cooling process of medium and thick plates. In the width direction of the steel plate, in addition to the convective heat exchange between the cooling water of the upper header directly sprayed from the nozzle and the hot steel plate, there is also secondary cooling of the cooling water that flows laterally from the stagnant water on the upper surface of the steel plate, resulting in the water flow velocity at the lateral end of the steel plate The sharp increase produces a cooling effect that cannot be ignored. In addition, the lower cooling water falls back to both sides of the steel plate, aggravating the une...

Claims

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Application Information

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IPC IPC(8): B21B37/74
Inventor 王丙兴王君张殿华胡贤磊王昭东刘相华王国栋
Owner NORTHEASTERN UNIV
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