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Method of Controlling Waves in Straightening Wide and Thick Plates

A control method and technology for wide and thick plates, which is applied in the field of straightening control of wide and thick plates, can solve the problems of different cooling speeds, easy generation of waves in plates, uneven rolling deformation, etc., and achieve the effect of eliminating the defects of waves and eliminating waves

Active Publication Date: 2016-02-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the plate is processed by the previous process, due to the effects of factors such as uneven rolling deformation, uneven temperature distribution, and different cooling rates, the plate is very easy to produce middle waves, and it is difficult to correct such middle waves in the existing straightening methods. waves to eliminate

Method used

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  • Method of Controlling Waves in Straightening Wide and Thick Plates

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Embodiment 1

[0036] Such as figure 2 As shown, a method for controlling waves in straightening wide and thick plates is characterized in that it comprises the following steps:

[0037] Step 1. The process control computer system is based on the steel type and specification of the wide and thick plate, the initial bending radius of curvature ρ0 and the initial mid-wave roughness λ 0 , set the target roughness λ of the medium wave 1 ;

[0038] Step 2. According to the parameters collected in step 1, calculate the residual stress distribution curve σ(x) of the wide and thick plate, take the width direction of the wide and thick plate as the x-axis, and take the center of the plate width as the origin

[0039] (2)

[0040] In the formula, ars, a1, a2 are empirical parameters, obtained from experiments, ars=(0.6~1.2)×10 -5 , a1=0.3~0.8, a2=-5.0~-1.5;

[0041] H is the thickness of wide and thick plate;

[0042] B is the width of wide and thick plate;

[0043] σcr is the warping critic...

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Abstract

The invention relates to the field of metal plate shape control, in particular to a wide and thick plate straightening control method. A wide and thick plate middle wave straightening control method includes: firstly, collecting a steel type, specifications, an initial bending curvature radius and initial middle wave waviness of a wide and thick plate requiring straightening, and setting target waviness of a middle wave; then, calculating to obtain a residual stress distribution curve of the wide and thick plate, and calculating to obtain negative roller bending values required by middle wave straightening according to the residual stress distribution curve; finally, straightening the wide and thick plate according to the negative roller bending values prior to utilizing a flatness gauge at an outlet of a straightener for detecting to obtain actual waviness after the wide and thick plate is straightened, repeating straightening operation until middle wave indexes satisfy finished product requirements and terminating straightening operation. The wide and thick plate middle wave straightening control method has the advantages that the required roller bending values of negative bending rollers during corresponding straightening is provided according to middle wave conditions of supplied materials, and straightening of the middle wave of the wide and thick plate can be guaranteed effectively, so that straightened plate shape indexes are guaranteed, and middle wave defects of the plate are eliminated.

Description

technical field [0001] The invention relates to the field of shape control of metal plates, in particular to a straightening control method for wide and thick plates. Background technique [0002] The straightening of wide and thick plates is generally based on the 9 / 5 roll straightening mode, which achieves the purpose of straightening through repeated bending of wide and thick plates in the roll gap of the leveler, that is, the metal plate is straight after straightening. It can be seen that the straightening machine achieves the purpose of improving the shape of the plate by eliminating the internal residual stress of the wide and thick plate, rather than improving the shape of the plate through obvious dimensional changes. [0003] At present, the design of steel plate straightening machines in the world adopts the multi-roll mode, that is, the steel plate 1 is reciprocally bent in the roll gap formed by the upper and lower rows of straightening rolls 2 to achieve the pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/02
Inventor 王英杰王英睿
Owner BAOSHAN IRON & STEEL CO LTD
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