CN113953332B - Control method for unilateral wave shape of strip steel between hot continuous rolling frames - Google Patents
Control method for unilateral wave shape of strip steel between hot continuous rolling frames Download PDFInfo
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- CN113953332B CN113953332B CN202010708088.8A CN202010708088A CN113953332B CN 113953332 B CN113953332 B CN 113953332B CN 202010708088 A CN202010708088 A CN 202010708088A CN 113953332 B CN113953332 B CN 113953332B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000005096 rolling process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000007547 defect Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 8
- 230000003211 malignant effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Abstract
A control method of single-side wave shape of strip steel between hot continuous rolling frames is provided, an image detection system is arranged to dynamically monitor the single-side wave shape between rolling frames in real time, a single-side roll gap adjustment value is calculated through a model of the single-side wave shape control system, and the single-side roll gap adjustment value is adjusted according to the single-side roll gap adjustment value, so that the single-side wave shape of the strip steel can be controlled in a mode of automatically intervening in single-side roll gap reduction of a finish rolling frame, the single-side wave shape defect occurrence rate of the hot rolled strip steel is effectively reduced, the quality of products is guaranteed, and the occurrence probability of accidents in production is greatly reduced.
Description
Technical Field
The invention relates to a strip steel wave shape control technology, in particular to a control method for single-side wave shapes of strip steel between hot continuous rolling mill frames.
Background
For hot continuous rolling, in the process of producing hot rolled strip steel, the strip steel is rolled by a finish rolling machine frame in sequence, a laser detector for detecting the wave shape is usually arranged on a 7 th (F7 for short) machine frame, and no effective measuring means exists on the single-side wave shape between the machine frames. At present, the control of the unilateral wave shape of the hot continuous rolling strip steel mainly judges whether the unilateral wave shape is generated by manually watching an industrial camera, and adopts corresponding measures to perform intervention control according to different wave shapes. However, the manual control has larger hysteresis, and meanwhile, the situation of misjudgment often occurs in the manual work due to the fact that the speed of the strip steel on the frame is very fast, so that the adjustment directions are opposite, serious malignant accidents are caused, the normal production of hot rolling is influenced, and larger loss is brought to a production factory.
The patent with publication No. CN103028617A discloses an online detection method for the wave-shaped defect of a hot-rolled strip steel and a measuring device thereof (patent I), wherein a wave-shaped defect measuring device is arranged at a fixed position above the strip steel at the inlet side of a hot-rolled separation line, the device is provided with a swinging rod, along with the movement of the hot-rolled strip steel, the end part of the swinging rod slides on the strip steel, and the wave-shaped height of the position of the end part of the swinging rod is calculated by measuring the deflection angle of the swinging rod. The technology mainly provides a wave-shape measuring device on the parting line, but the wave shape cannot be effectively detected in the dynamic rolling process.
Patent application number 201510348732.4 discloses a control method and a system for improving coiling edge damage caused by strip steel finish rolling wave shape (patent II), which refers to a control technology for adjusting an opening additional value set value of a coiling side guide plate in real time according to a finish rolling outlet strip steel wave shape flatness detection value so as to improve coiling edge damage and solve the problem of the prior art about hot rolled strip steel coil edge damage. The technology mainly controls the opening of the coiling guide plate through the wave shape measured by the F7 final frame, reduces the defect of edge damage, but cannot solve the problem of unilateral wave shape.
The patent with the application number 201120223665.0 discloses a simple measuring device for the wave-shaped defect of the hot-rolled strip steel, which refers to a simple measuring device for the wave-shaped defect of the hot-rolled strip steel (a third patent), and mainly comprises a transverse ruler, a longitudinal ruler, a connecting piece and other parts, wherein the transverse ruler and the longitudinal ruler are vertically arranged and are connected through the connecting piece, a first sliding groove and a second sliding groove are respectively arranged on the front surface and the back surface of the connecting piece, and extension lines of the first sliding groove and the second sliding groove are mutually perpendicular. However, the technology is to measure the wave shape manually, only improves the precision and efficiency of measuring the wave shape defect manually, and does not participate in control.
In summary, the first patent and the third patent detect the wave shape of the strip steel by researching the static state, while the second patent controls the opening of the coiling guide plate mainly through the wave shape measured by the F7 frame, so that the defect of edge damage is reduced, the situation of the strip steel between finish rolling mills cannot be dynamically monitored in real time, and the wave shape of the strip steel is improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a control method for single-side wave shape of strip steel between hot continuous rolling frames, which can dynamically monitor the strip steel between finishing rolling frames in real time, and control the single-side wave shape of the strip steel in a mode of automatically intervening in single-side roll gap pressing of a finishing rolling frame when wave shape phenomenon is monitored by an image recognition technology.
The invention discloses a control method of a single-side wave shape of strip steel between hot continuous rolling frames, which comprises the following steps:
a. Establishing a unilateral wave-shaped control system, and arranging an image detection system among the frames;
b. During rolling, a unilateral wave control system receives detection data of an image detection system, wherein the detection data comprise detected wave arc length and projection length of the wave in the vertical direction, and data of a computer at the upper layer level, including rolled steel coil width, steel grade, thickness, roller gap value of a unilateral rolling in real time and correction coefficient;
c. judging whether a single-side wave shape appears on the rolled steel coil between the frames by a single-side wave shape control system, judging which side the single-side wave appears on, if so, executing the step d, and if not, rolling according to the original given rolling model;
d. According to the single-side roll gap adjustment control model, single-side roll gap adjustment of the rolling mill is carried out;
e. and d, judging whether the F7 frame throws steel or not by using the unilateral wave control system, if so, ending the unilateral wave control model of the steel, and if not, returning to the step b.
2. The method for controlling the unilateral wave shape of the strip steel between the hot continuous rolling frames according to claim 1, which is characterized in that: in step c, the inequality of judging that the unilateral wave shape appears is as follows: and I (s-l)/(l I M,IM) is a wave threshold, and if the inequality is true, a single-sided wave appears.
3. The method for controlling the unilateral wave shape of the strip steel between the hot continuous rolling frames according to claim 1, which is characterized in that: in the step d, the single-side roll gap adjustment control model is as follows:
Wherein Δgap i is the actual adjustment amount of the roller Gap on one side of the ith frame, i=1, 2,3,4,5,6;
taking the value of the wave shape between the ith and the i+1 frames if the wave shape appears on the working side, and taking the value of the wave shape if the wave shape appears on the working side, otherwise taking the value of the wave shape;
K mi is the rigidity coefficient of the mill of the ith frame;
K si is the plastic deformation coefficient of the strip steel of the ith rack;
k i is the efficiency coefficient of the ith rack;
kt is a thickness coefficient of the strip steel and is determined according to the grade of the strip steel;
Kw is a strip steel width coefficient and is determined according to the grade of the steel;
kc is a correction coefficient;
s is the detected wave arc;
l is the projected length of the wave in the vertical direction.
In step d, a maximum threshold value Δ Gapmax is also set, and when the calculated Δgap i is larger than Δ Gapmax, the single-side roll Gap is set according to Δ Gapmax.
The control method of the single-side wave shape of the strip steel between the hot continuous rolling frames can dynamically monitor the strip steel between the finishing rolling frames in real time, and when the wave shape phenomenon is monitored through an image recognition technology, the single-side roll gap pressing of the finishing rolling frames is automatically interfered to control the single-side wave shape of the strip steel. The similar feedback control mode for adjusting the rolling reduction of the single-side roll gap of the finish rolling frame after the strip steel wave shape is identified according to the image identification technology reduces the incidence rate of single-side wave shape defects of the hot rolled strip steel, is beneficial to ensuring the quality of products and reduces the occurrence probability of accidents in production.
Drawings
FIG. 1 is a schematic diagram of an image detection system according to the present invention;
FIG. 2 is a schematic view of the working side of the strip of the present invention having a wave shape;
FIG. 3 is a flow chart of the control method of the single-side wave shape of the strip steel between the hot continuous rolling frames.
Detailed Description
The method for controlling the unilateral wave shape of the strip steel between the hot continuous rolling frames is further described below with reference to the accompanying drawings and the embodiment.
Referring to fig. 1 to 3, the specific steps of the method for controlling the single-side wave shape of the strip steel between hot continuous rolling frames of the invention are as follows:
a. establishing a unilateral wave-shaped control system, and arranging an image detection system 1 among the frames;
b. During rolling, a unilateral wave shape control system receives detection data of the image detection system 1, wherein the detection data comprise detected wave shape arc length s and projection length l of the wave shape in the vertical direction, and data of a computer at the upper layer are received, and the data comprise a steel coil number, a rolled steel coil width, a steel grade, a thickness, a roll gap value of a unilateral real-time rolling, a correction coefficient and the like;
c. Judging whether a single-side wave shape appears on the rolled steel coil between the frames by a single-side wave shape control system, judging which side the single-side wave appears on, if so, executing the step d, and if not, rolling according to the original given rolling model; the inequality for judging the occurrence of the unilateral wave shape can be specifically expressed by the following formula: and I (s-l)/(l I M,IM) is a wave threshold, and if the inequality is true, a single-sided wave appears.
D. According to the single-side roll gap adjustment control model, single-side roll gap adjustment of the rolling mill is carried out; the single-side roll gap adjustment control model can adopt the following formula:
Wherein Δgap i is the actual adjustment amount of the roller Gap on one side of the ith frame, i=1, 2,3,4,5,6;
taking the value of the wave shape between the ith and the i+1 frames if the wave shape appears on the working side, and taking the value of the wave shape if the wave shape appears on the working side, otherwise taking the value of the wave shape;
K mi is the rigidity coefficient of the mill of the ith frame;
K si is the plastic deformation coefficient of the strip steel of the ith rack;
k i is the efficiency coefficient of the ith rack;
kt is a thickness coefficient of the strip steel and is determined according to the grade of the strip steel;
Kw is a strip steel width coefficient and is determined according to the grade of the steel;
kc is a correction coefficient;
s is the detected wave arc;
l is the projected length of the wave in the vertical direction.
When the calculated Δgap i is larger than Δ Gapmax, the single-side roll Gap is set according to Δ Gapmax, and the single-side roll Gap of the rolling mill is cyclically adjusted.
E. And d, judging whether the F7 frame throws steel or not by using the unilateral wave control system, if so, ending the unilateral wave control model of the steel, and if not, returning to the step b to control the next period.
Examples
When the rolled product is rolled to the coil, the working side of the strip steel generates single-side waves, the detected data are l=1.5 meters, s=2.2 meters and S-L/l= 0.46667, after the image recognition system recognizes that the working side between the F5/F6 frames generates single-side waves, the model is controlled to start according to the formula after judging that the working side between the F5/F6 frames generates single-side waves, the model is controlled to start according to the formula (S-L) +.IM=0.2), wherein the thickness of the rolled product is 2.0mm, the width is 900mm, and the coil number is 121046552100And setting a single-side roll gap value, and timely adjusting the single-side wave shape to avoid malignant accidents.
The set values of the coefficients are shown in the following table:
The method is obtained by calculation of the formula:
therefore, when Δ Gapi < [ delta ] Gapmax, therefore [ delta ] Gapi is adjusted to 0.088mm, s-l/l=0.095 after adjustment, and the wave shape is small.
Claims (1)
1. The control method of the unilateral wave shape of the strip steel between the hot continuous rolling frames is characterized by comprising the following steps:
a. Establishing a unilateral wave-shaped control system, and arranging an image detection system among the frames;
b. During rolling, a unilateral wave control system receives detection data of an image detection system, wherein the detection data comprise detected wave arc length and projection length of the wave in the vertical direction, and data of a computer at the upper layer level, including rolled steel coil width, steel grade, thickness, roller gap value of a unilateral rolling in real time and correction coefficient;
c. judging whether a single-side wave shape appears on the rolled steel coil between the frames by a single-side wave shape control system, judging which side the single-side wave appears on, if so, executing the step d, and if not, rolling according to the original given rolling model;
d. According to the single-side roll gap adjustment control model, single-side roll gap adjustment of the rolling mill is carried out;
e. judging whether the F7 frame throws steel or not by the unilateral wave control system, if so, ending the unilateral wave control model of the steel, if not, returning to the step b,
In the step d, the single-side roll gap adjustment control model is as follows:
wherein Δgap i is the actual adjustment amount of the roller Gap at one side of the ith frame, i=1, 2,3,4,5,6;
taking the value of the wave shape between the ith and the i+1 frames if the wave shape appears on the working side, and taking the value of the wave shape if the wave shape appears on the working side, otherwise taking the value of the wave shape;
K mi is the rigidity coefficient of the mill of the ith frame;
K si is the plastic deformation coefficient of the strip steel of the ith rack;
k i is the efficiency coefficient of the ith rack;
kt is a thickness coefficient of the strip steel and is determined according to the grade of the strip steel;
Kw is a strip steel width coefficient and is determined according to the grade of the steel;
kc is a correction coefficient;
s is the detected wave arc;
l is the projection length of the wave shape in the vertical direction;
in step c, the inequality of judging that the unilateral wave shape appears is as follows: i (s-l)/(l I M,IM) is a wave threshold, if the inequality is true, a single-sided wave appears;
In step d, a maximum threshold value Δ Gapmax is also set, and when the calculated Δgap i is larger than Δ Gapmax, the single-side roll Gap is set according to Δ Gapmax.
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| CN202010708088.8A CN113953332B (en) | 2020-07-21 | Control method for unilateral wave shape of strip steel between hot continuous rolling frames |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010708088.8A CN113953332B (en) | 2020-07-21 | Control method for unilateral wave shape of strip steel between hot continuous rolling frames |
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| Publication Number | Publication Date |
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| CN113953332A CN113953332A (en) | 2022-01-21 |
| CN113953332B true CN113953332B (en) | 2024-07-12 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106984652A (en) * | 2016-01-21 | 2017-07-28 | 宝山钢铁股份有限公司 | The method that finishing stand sideslip is controlled according to breakdown bar camber |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106984652A (en) * | 2016-01-21 | 2017-07-28 | 宝山钢铁股份有限公司 | The method that finishing stand sideslip is controlled according to breakdown bar camber |
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