CN113953332A - Control method for strip steel single-side wave shape between hot continuous rolling mill frames - Google Patents
Control method for strip steel single-side wave shape between hot continuous rolling mill frames Download PDFInfo
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- CN113953332A CN113953332A CN202010708088.8A CN202010708088A CN113953332A CN 113953332 A CN113953332 A CN 113953332A CN 202010708088 A CN202010708088 A CN 202010708088A CN 113953332 A CN113953332 A CN 113953332A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000005096 rolling process Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000002436 steel type Substances 0.000 claims description 9
- 230000007547 defect Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 8
- 238000005098 hot rolling Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
Abstract
A control method for the unilateral wave shape of band steel between hot continuous rolling mill stands is characterized in that an image detection system is arranged for dynamically monitoring the unilateral wave shape between the rolling mill stands in real time, a unilateral roll gap adjusting value is calculated through a model of the unilateral wave shape control system and is adjusted according to the unilateral roll gap adjusting value, so that the unilateral wave shape of the band steel can be controlled in a mode of automatically intervening when the unilateral roll gap of a finish rolling stand is pressed down, the occurrence rate of the unilateral wave shape defect of the hot rolled band steel is effectively reduced, the quality of products is guaranteed, and the accident occurrence probability in production is greatly reduced.
Description
Technical Field
The invention relates to a strip steel wave shape control technology, in particular to a method for controlling the single-side wave shape of strip steel between hot continuous rolling mill frames.
Background
For hot continuous rolling, in the production process of hot rolled strip steel, the strip steel is rolled by a finish rolling stand in sequence, a laser detector for detecting the wave shape is usually arranged on the 7 th (F7 for short), and the single-side wave shape between the stands has no effective measurement means. At present, the control of the unilateral wave shape of the hot continuous rolling strip steel is mainly to judge whether the unilateral wave shape is generated by manually watching an industrial camera, and corresponding measures are taken according to different wave shapes for intervention control. However, the manual control has a large hysteresis, and meanwhile, because the strip steel is very fast in the stand, the judgment error often occurs in the manual work, so that the adjustment direction is opposite, thereby causing serious malignant accidents, influencing the normal production of hot rolling and bringing large loss to a production plant.
The patent with publication number CN103028617A discloses an on-line detection method for wave-shaped defects of hot-rolled strip steel and a measuring device thereof (patent one), wherein the wave-shaped defect measuring device is arranged at a fixed position above the strip steel at the inlet side of a hot-rolled coil splitting line, the device is provided with a swing rod, the end part of the swing rod slides on the strip steel along with the movement of the hot-rolled strip steel, and the wave-shaped height of the position of the end part of the swing rod is calculated by measuring the deflection angle of the swing rod. The technology mainly invents a wave shape measuring device on a coil separating line, but cannot effectively detect the wave shape in the dynamic rolling process.
The patent with the application number of 201510348732.4 discloses a control method and a control system (patent II) for improving coiling edge loss caused by strip steel finish rolling wave shape, which refers to a control technology for adjusting the opening added value set value of a coiling side guide plate in real time according to a flatness detection value of the strip steel finish rolling outlet wave shape so as to improve coiling edge loss, and solves the problem of edge damage of the hot rolling strip steel coiling shape in the prior art. According to the technology, the opening degree of the winding guide plate is controlled mainly through the wave shape measured by the F7 final frame, the defect of edge damage is reduced, but the problem of the single-side wave shape cannot be solved.
The patent with application number 201120223665.0 discloses a simple and easy measuring device of hot rolling belted steel wave shape defect, and it mentions the simple and easy measuring device (patent three) of measuring hot rolling belted steel wave shape defect, mainly has parts such as horizontal ruler, vertical ruler and connecting piece, places perpendicularly and is connected through the connecting piece through horizontal ruler and vertical ruler, the connecting piece openly is equipped with spout one and spout two respectively with the back, and spout one is mutually perpendicular with the extension line of spout two. However, the technology still measures the wave shape manually, only improves the precision and efficiency of manually measuring the wave shape defects, and does not participate in control.
To sum up, the wave shape of strip steel is detected under the static state through studying to these two patents of above-mentioned patent one and patent three, and the wave shape that patent two was measured mainly through the F7 frame is controlled the aperture of batching baffle, reduces limit damage defect, and is irrelevant with wave shape control, can't carry out dynamic real time monitoring to the strip steel condition between the finish rolling mill, and then improves the strip steel wave shape.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a control method for the unilateral wave shape of the strip steel between the hot continuous rolling mill frames, which can dynamically monitor the strip steel between the finishing mill frames in real time, and control the unilateral wave shape of the strip steel in a mode of automatically intervening the unilateral roll gap pressing of the finishing mill frames when the wave shape phenomenon is monitored by an image recognition technology.
The invention discloses a control method of single-side wave shape of strip steel between hot continuous rolling mill frames, which comprises the following steps:
a. establishing a unilateral wave-shaped control system, and arranging an image detection system among the racks;
b. during rolling, the single-side wave shape control system receives detection data of the image detection system, wherein the detection data comprises detected wave shape arc length and the projection length of the wave shape in the vertical direction, and receives data of a computer at the previous layer level, wherein the data comprises the width, steel type and thickness of a rolled steel coil, a real-time rolling single-side roll gap value and a correction coefficient;
c. judging whether the rolled steel coil has single-side wave shape on the rack by a single-side wave shape control system, judging which side the single-side wave occurs on, if so, executing the step d, and if not, rolling according to the original given rolling model;
d. adjusting the roll gap on one side of the rolling mill according to a roll gap adjustment control model on one side;
e. and (4) judging whether the F7 rack throws steel or not by the unilateral wave shape control system, if so, ending the unilateral wave control model of the steel block, and if not, returning to the step b.
2. The control of the single edge wave shape of the strip steel between hot continuous rolling mill stands as claimed in claim 1The method is characterized in that: in step c, the inequality of judging the occurrence of the unilateral wave shape is as follows: (s-l) ÷ l purple>IM，IMThe wave threshold value is a single-side wave if the inequality is true.
3. The method for controlling the single-edge wave shape of the strip steel between the hot continuous rolling mill frames as claimed in claim 1, wherein the method comprises the following steps: in step d, the single-side roll gap adjusting control model is as follows:
in the formula, delta GapiThe actual adjustment amount of the roll gap on one side of the ith frame is i ═ 1,2,3,4,5, 6;
Kmithe rolling mill stiffness coefficient of the ith stand;
Ksithe plastic deformation coefficient of the strip steel of the ith frame;
Kithe efficiency coefficient of the ith frame;
kt is the thickness coefficient of the strip steel and is determined according to the steel type;
kw is the width coefficient of the strip steel and is determined according to the steel types;
kc is a correction coefficient;
s is the detected wave arc;
and l is the projection length of the wave shape in the vertical direction.
In step d, a maximum threshold value Δ Gapmax is also set, and when the calculated Δ Gap is usediIf the gap is larger than the delta Gapmax, the single-side roll gap is set according to the delta Gapmax.
The control method of the unilateral wave shape of the strip steel between the hot continuous rolling mill frames can dynamically monitor the strip steel between the finishing mill frames in real time, and automatically intervenes in the unilateral roll gap pressing of the finishing mill frame when the wave shape phenomenon is monitored through the image recognition technology to control the unilateral wave shape of the strip steel. The similar feedback control mode of adjusting the rolling gap pressing at the single side of the finish rolling rack after the strip steel wave shape is identified according to the image identification technology reduces the defect rate of the single side wave shape of the hot rolled strip steel, is beneficial to ensuring the quality of products and reduces the accident occurrence probability in production.
Drawings
FIG. 1 is a schematic diagram of an image inspection system according to the present invention;
FIG. 2 is a schematic view of the present invention showing the presence of waves on the working side of the strip;
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 mill frames.
Detailed Description
The method for controlling the single-side wave shape of the strip steel between the hot continuous rolling mill stands according to the invention is further described below with reference to the accompanying drawings and the embodiment.
Referring to fig. 1 to 3, the method for controlling the single-side wave shape of the strip steel between the hot continuous rolling stands of the present invention comprises the following steps:
a. establishing a unilateral wave-shaped control system, and arranging an image detection system 1 among all the racks;
b. during rolling, the single-side wave shape control system receives detection data of the image detection system 1, wherein the detection data comprises detected wave shape arc length s and projection length l of the wave shape in the vertical direction, and receives data of a computer at the previous layer, wherein the data comprises a steel coil number, a rolled steel coil width, a steel type, thickness, a real-time rolling single-side roll gap value, a correction coefficient and the like;
c. judging whether the rolled steel coil has single-side wave shape on the rack by a single-side wave shape control system, judging which side the single-side wave occurs 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 specifically adopt the following formula: (s-l) ÷ l purple>IM，IMThe wave threshold value is a single-side wave if the inequality is true.
d. Adjusting the roll gap on one side of the rolling mill according to a roll gap adjustment control model on one side; the unilateral roll gap adjusting and controlling model can adopt the following formula:
in the formula, delta GapiThe actual adjustment amount of the roll gap on one side of the ith frame is i ═ 1,2,3,4,5, 6;
Kmithe rolling mill stiffness coefficient of the ith stand;
Ksithe plastic deformation coefficient of the strip steel of the ith frame;
Kithe efficiency coefficient of the ith frame;
kt is the thickness coefficient of the strip steel and is determined according to the steel type;
kw is the width coefficient of the strip steel and is determined according to the steel types;
kc is a correction coefficient;
s is the detected wave arc;
l is the projected length of the wave in the vertical direction.
In addition, a maximum threshold value delta Gapmax is set, and when the calculated delta Gap is usediAnd when the gap is larger than the delta Gapmax, setting the single-side roll gap according to the delta Gapmax, and circularly adjusting the single-side roll gap of the rolling mill.
e. And (4) judging whether the F7 rack throws steel or not by the unilateral wave shape control system, if so, ending the unilateral wave control model of the steel block, otherwise, returning to the step b for the control of the next period.
Examples
The thickness of the rolled finished product is 2.0mm, the width is 900mm, the coil number is 121046552100, when the rolled finished product is rolled to the coil, the working side of the strip steel generates single-edge wave shape, the detected data is 1.5 meters, 2.2 meters and 0.46667, the image identification system identifies that single-edge wave is generated on the working side between F5/F6 stands, and the single-edge wave is judged to be | (S-L) ÷ L ÷ M>IM＝0.2 then controlling the model to start according to the formula
The roll gap value of the single side is set, and the wave shape of the single side is adjusted in time to avoid serious accidents.
The coefficient settings are as follows:
the formula is calculated to obtain:
therefore, when Δ Gapi < Δgapmax, Δ Gapi is adjusted to 0.088mm, and after adjustment, s-l/l is 0.095, the wave shape is small.
Claims (4)
1. A control method for the unilateral wave shape of strip steel between hot continuous rolling mill stands is characterized by comprising the following steps:
a. establishing a unilateral wave-shaped control system, and arranging an image detection system among the racks;
b. during rolling, the single-side wave shape control system receives detection data of the image detection system, wherein the detection data comprises detected wave shape arc length and the projection length of the wave shape in the vertical direction, and receives data of a computer at the previous layer level, wherein the data comprises the width, steel type and thickness of a rolled steel coil, a real-time rolling single-side roll gap value and a correction coefficient;
c. judging whether the rolled steel coil has single-side wave shape on the rack by a single-side wave shape control system, judging which side the single-side wave occurs on, if so, executing the step d, and if not, rolling according to the original given rolling model;
d. adjusting the roll gap on one side of the rolling mill according to a roll gap adjustment control model on one side;
e. and (4) judging whether the F7 rack throws steel or not by the unilateral wave shape control system, if so, ending the unilateral wave control model of the steel block, and if not, returning to the step b.
2. The method for controlling the single-edge wave shape of the strip steel between the hot continuous rolling mill frames as claimed in claim 1, wherein the method comprises the following steps: in step c, the inequality of judging the occurrence of the unilateral wave shape is as follows: (s-l) ÷ l purple>IM，IMThe wave threshold value is a single-side wave if the inequality is true.
3. The method for controlling the single-edge wave shape of the strip steel between the hot continuous rolling mill frames as claimed in claim 1, wherein the method comprises the following steps: in step d, the single-side roll gap adjusting control model is as follows:
in the formula, delta GapiThe actual adjustment amount of the roll gap on one side of the ith frame is i ═ 1,2,3,4,5, 6;
Kmithe rolling mill stiffness coefficient of the ith stand;
Ksithe plastic deformation coefficient of the strip steel of the ith frame;
Kithe efficiency coefficient of the ith frame;
kt is the thickness coefficient of the strip steel and is determined according to the steel type;
kw is the width coefficient of the strip steel and is determined according to the steel types;
kc is a correction coefficient;
s is the detected wave arc;
and l is the projection length of the wave shape in the vertical direction.
4. The method for controlling the single-edge wave shape of the strip steel between the hot continuous rolling mill frames as claimed in claim 4, wherein the method comprises the following steps: in thatIn step d, a maximum threshold value delta Gapmax is also set, and when the calculated delta Gap isiIf the gap is larger than the delta Gapmax, the single-side roll gap is set according to the delta Gapmax.
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