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Method for controlling shapes of double-side wave and medium wave plate of five-stand cold continuous rolling high-strength steel plate belt

A five-stand cold continuous rolling, high-strength steel plate technology, applied in contour control and other directions, can solve problems such as poor shape, large deviation, inability to eliminate double-sided and medium-wave shape defects, and achieve high precision.

Active Publication Date: 2019-01-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the strength of the cold-rolled incoming material is high, the deviation between the assumed value and the actual value is large, and the shape cannot be accurately controlled, resulting in poor shape at the entrance of the last stand, even if the shape actuator of the last stand reaches the limit value , also can not eliminate the double-sided waves and mid-wave board shape defects caused by the front rack

Method used

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  • Method for controlling shapes of double-side wave and medium wave plate of five-stand cold continuous rolling high-strength steel plate belt
  • Method for controlling shapes of double-side wave and medium wave plate of five-stand cold continuous rolling high-strength steel plate belt
  • Method for controlling shapes of double-side wave and medium wave plate of five-stand cold continuous rolling high-strength steel plate belt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Preparation thickness is 2.75mm, and width is the QP980 automobile dual-phase steel strip of 1250mm, after five times of continuous cold rolling, be rolled into the plate strip that thickness is 0.7mm, adopt five stands cold rolling high-strength steel plate of the present invention The parameters of the bending force of each frame are shown in Table 1 before and after the control method of the double-sided wave and middle wave plate shape of the belt:

[0100] Each frame roll bending force parameter before and after the method of the present invention is put into use in table 1

[0101]

[0102] As can be seen from Table 1, before the method of the present invention is put into use, the roll bending force of the fifth frame is close to the limit value, while the roll bending force of the front several frames still has a margin. Figure 4 It is the shape of the finished strip before the method of the present invention is put into use. It can be seen from the figure t...

Embodiment 2

[0104] Preparation thickness is 3.5mm, and width is the DP980 automobile dual-phase steel strip of 1160mm, after five times of continuous cold rolling, be rolled into the plate strip that thickness is 1.2mm, adopt five stand cold rolling high-strength steel plates of the present invention The parameters of the bending force of each rack are shown in Table 2 before and after the control method of the double-sided wave and middle wave plate shape of the belt:

[0105] Each frame roll bending force parameter before and after the method of the present invention is put into use in table 2

[0106]

[0107] As can be seen from Table 2, before the method of the present invention is put into use, the bending force of the fifth frame is close to the limit value, and the bending force of the front several frames still has a margin. Figure 6 It is the shape of the finished strip before the method of the present invention is put into use. It can be seen from the figure that the qualit...

Embodiment 3

[0109] Preparation thickness is 3.5mm, and width is the DP780 automobile dual-phase steel strip of 1200mm, after five times of continuous cold rolling, be rolled into the plate strip that thickness is 0.9mm, adopt five stands cold rolling high-strength steel plate of the present invention The parameters of the bending force of each rack are shown in Table 3:

[0110] Table 3 The bending force parameters of each frame before and after the method of the present invention is put into use

[0111]

[0112] As can be seen from Table 3, before the method of the present invention is put into use, the roll bending force of the fifth frame is close to the limit value, while the roll bending force of the front several frames still has a margin. Figure 8 It is the shape of the finished strip before the method of the present invention is put into use. It can be seen from the figure that the quality of the strip is poor, and there are obvious bilateral wave defects on both sides of the...

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Abstract

The invention provides a method for controlling the shapes of a double-side wave and medium wave plate of a five-stand cold continuous rolling high-strength steel plate belt, and relates to the technical field of shape control of cold continuous rolling steel plate belts. The method comprises the following steps of: firstly, giving a precondition for controlling the shapes of the double-side waveand medium wave plate by using the method; secondly, setting an end frame as an i-1th stand; and calculating the shape value of the double-side wave or medium wave plate of an outlet of the i-th stand, comparing the calculated shape value of the double-side wave or medium wave plate of the outlet of the i-1th stand with a measured value, repeatedly carrying out the calculation until the calculatedvalue meets the quality requirement of the finished product plate shape; calculate a correction value of a roll bending force between a working roller and middle roller of the i-1th stand, if the correction value of the roll bending force does not meet the requirement, calculating a correction value of a roll bending force of between a working roll and middle roll of the i-2th stand; until the shape deviation of the double-side wave or medium wave plate at the outlet of the i-1th stand reaches the quality requirement of the finished product shape. According to the control method, the controlprecision of the shape of the double-side wave or medium wave plate of the front stand is improved, the regulation and control pressure of the last stand is reduced, and the plate shape quality of theproduct is improved.

Description

technical field [0001] The invention relates to the technical field of five-stand cold-rolled strip shape control technology, in particular to a five-stand cold-rolled high-strength steel strip shape control method for both sides and middle waves. Background technique [0002] Cold-rolled steel strips are widely used in various fields of the national economy. With the improvement of the quality of cold-rolled steel strips, users' requirements for the shape quality are also gradually increasing. Good shape quality plays a vital role in improving product quality and yield in downstream processes. [0003] Like the thickness and width, the strip shape is an important index to measure the geometrical accuracy of the strip steel. It is the degree of warping of the strip steel intuitively, and its essence is the distribution of the internal residual stress of the strip steel along the width direction of the strip after rolling. Common board shape defects are mainly divided into s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
CPCB21B37/28
Inventor 李长生金鑫王煜彭良贵武志成
Owner NORTHEASTERN UNIV
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