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Thickness deviation-on-plate control method of cold-rolled sheet

A control method and technology for cold-rolled sheets, which are used in rolling mill control devices, metal rolling, metal rolling, etc., can solve the problem of poor control effect, low yield, and can not fully reflect the length, width, and thickness of the entire strip. problems, to achieve the effect of small thickness fluctuation, good effect, accurate control strategy and calculation method

Active Publication Date: 2019-01-15
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is used to solve the problems of poor control effect of the same plate difference in the existing control method, inability to fully reflect the thickness value of the length and width of the strip steel, and low yield

Method used

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Experimental program
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Effect test

Embodiment

[0058] Taking a 5-stand tandem cold rolling mill as an example, the control method of the present invention is described in detail.

[0059] The thickness of the hot-rolled incoming material (center point) is 2.5mm, the thickness of the cold-rolled exit is 0.5mm, and the absolute thickness difference requirement of the exit edge (15mm from the edge) is 6μm.

[0060] Determine whether the edge thickness difference is less than the parameter c (the value of parameter c is 1 μm), if the edge thickness difference of the driving side or the working side of the strip steel is less than the parameter c, immediately reduce the bending force value of the work roll of the rack (fixed value 2T) to ensure that the edge does not thicken, and the control process of this cycle is completed; if the thickness difference between the driving side and the working side is greater than the parameter c, enter the next parameter judgment;

[0061] Determine whether the thickness difference between th...

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Abstract

The invention relates to a thickness deviation-on-plate control method of a cold-rolled sheet. The invention adopts a cold rolling absolute thickness difference thickness deviation-on-plate control mode, a difference value of center thickness of strip steel and a set thickness value is calculated correspondingly so as to ensure the control mode of the thickness deviation-on-plate of the strip steel whole plate, the small fluctuation of the thickness of an edge part in the length direction of the strip steel is guaranteed, and a control strategy of bending roll first and displacement later is adopted; and a control scheme of the thickness deviation-on-plate thickness absolute value refers to the fact that when the thickness deviation-on-plate is controlled, an absolute value thickness control mode is adopted, a control mode is implemented according to a each thickness value of a transverse position. According to the method, a thickness deviation-on-plate overall level in a cold rollingrolling process can be enhanced, the thickness deviation-on-plate of a cold rolling high-thickness and high-precision product is improved, the cold rolling product quality is improved, the shearing amount is reduced, and the productivity is improved; the problems that an existing control mode is poor in control effect on the thickness deviation-on-plate, the length and width of the thickness valuesituation of the strip steel whole plate cannot be comprehensively reflected, and the yield is low are solved.

Description

technical field [0001] The invention relates to the technical field of cold rolling, in particular to a method for controlling the same-plate difference of cold-rolled plates. Background technique [0002] The same-plate thickness tolerance of cold-rolled products (referred to as the same-plate difference) refers to the thickness tolerance of each point on the same cold-rolled plate, which includes the transverse thickness tolerance and longitudinal thickness tolerance on the same steel plate. Edge drop (Edge Drop, referred to as edge drop, also known as edge thinning) is an important parameter of dimensional accuracy index. The traditional definition of edge drop is the difference between the thickness tA at the position 100mm from the edge minus the thickness tB at the position 15mm from the edge, such as figure 1 shown. [0003] However, with the continuous improvement of users' requirements for product quality, the traditional definition of edge drop has been difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/16B21B38/04
CPCB21B37/16B21B37/165
Inventor 李红梅曾建峰李山青周毅熊伟
Owner BAOSHAN IRON & STEEL CO LTD
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