CN114289525A - Method for detecting and straightening warping of head of hot-rolled steel plate - Google Patents
Method for detecting and straightening warping of head of hot-rolled steel plate Download PDFInfo
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- CN114289525A CN114289525A CN202111551810.2A CN202111551810A CN114289525A CN 114289525 A CN114289525 A CN 114289525A CN 202111551810 A CN202111551810 A CN 202111551810A CN 114289525 A CN114289525 A CN 114289525A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
- 239000010959 steel Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a method for detecting and straightening head warping of a hot-rolled steel plate, which specifically comprises the following steps: s1, arranging a laser cold detection device; the laser cold detection device is provided with a first height h1A second height h2… … nth height hn(ii) a And an ultimate height H; s2, moving the steel plate to a cooling bed, and triggering an anti-straightening signal when the head of the steel plate shields the signal of the laser cold detection device; s3, the PLC control system receives the reverse straightening signal of the limit height H to stop the steel plate straightening, and an operator manually cuts off the part of the steel plate warping exceeding the limit height H; s4, the PLC control system automatically judges the nth height h with the highest execution heightnThe reverse straightening signal of (1); s5, straightening the rest part of the steel plate continuously after the head of the steel plate is straightened by the hot straightening machine. The invention detects the reverse straightening signal of the head warpage of the hot straightening incoming steel plate, controls the opening height of the roll gap of the hot straightening machine and the running direction of the straightening machine in a linkage manner, and performs reverse straightening by the hot straightening machineThe process eliminates the phenomenon of 'warping and buckling' and enables the steel plate to be flat.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for detecting and straightening warping of a head of a hot-rolled steel plate.
Background
In the existing steel plate rolling production system, the head of a part of a steel plate after the rolling process is finished is warped before the steel plate enters the hot straightening process, namely the phenomenon of head warping is caused. If the processing can not be found in time after the situation of the 'warping buckle head' occurs, the angle of the cooling water sprayed to the surface of the steel plate can be changed after the ultra-fast cooling process of the steel plate, so that the cooling situation of the head and the tail of the steel plate and the execution of the cooling process are changed. The performance of the steel plate can be affected by slight warping, and the steel plate can directly impact the body equipment of the cooling system when the steel plate is seriously warped, so that the steel rolling cooling equipment is damaged.
The existing detection and prevention method is to manually observe and pick out unqualified steel plates, but the manual detection lacks a specific quantitative detection means, so that a detection and straightening method for the head warping of the hot rolled steel plate is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a method for detecting and straightening the head warpage of a hot rolled steel plate.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for detecting and straightening warping of a head of a hot-rolled steel plate specifically comprises the following steps:
step 1, a steel plate rolled by a rolling mill needs to pass through a laser cold detection device before entering a cooling bed; the transmitter and the receiver of the laser cold detection device are respectively arranged at two sides of the advancing direction of the steel plate and are positioned at the same height; the laser cold detection device is provided with a plurality of groups of detection heights in the vertical direction, and the detection heights from low to high are first heights h1A second height h2… … nth height hnWherein n is a positive integer; the laser cold detection device is also provided with a group of limit heights H, and the limit heights H are higher than the nth height Hn；
and 5, after the head of the steel plate is leveled by the hot straightener, the steel plate continues to perform a normal straightening process, and the rest part of the steel plate is straightened.
As a further preferred aspect of the present invention, if the signal of the laser cold inspection device is not blocked by the warpage of the head of the steel plate, the hot straightening machine executes the normal straightening process when the PLC control system does not receive the anti-straightening signal, and the straightening direction is the direction in which the rolling mill faces the cooling bed; on the contrary, if the signal of the laser cold detection device is blocked by the warping of the head of the steel plate, and the PLC control system receives the reverse straightening signal, the hot straightening machine executes a reverse straightening process, and the straightening direction is the direction of the cold bed facing the rolling mill.
It is further preferred according to the invention that the limiting height H of the steel sheet is at most 350 mm.
As a further preferred aspect of the present invention, the laser cold inspection apparatus in step 1 is provided with 3 sets of inspection heights, each being a first height h1A second height h2And a third height h3(ii) a First height h1Is 80-120 mm and has a second height h2130-170 mm, third height h3Is 180-220 mm.
As a further preference of the invention, the first height h1Is 100mm, the second height h2Is 150mm, and a third height h3Is 200 mm.
As a further preferred aspect of the present invention, the automatic determination logic of the PLC control system is: when the first height h is acquired simultaneously1A second height h2And a third height h3When the signal is inverted, the third height h is implemented3According to the reverse straightening signal, the roll gap of the hot straightening machine is raised to 300mm, and the steel plate moves towards the direction of a cooling bed on a conveying roller way until the head of the steel plate enters the hot straightening machine for a distance of 4 meters; when the first height h is acquired simultaneously1A second height h2Is not detected to a third height h3In the case of the reverse straightening signal, the second height h is implemented2The roll gap of the hot straightener is raised to 250mm, and the steel plate is arranged on a conveying rollMoving the steel plate to the direction of the cooling bed on the way until the head of the steel plate enters the hot straightening machine for a distance of 3 meters; when the first height h is acquired1Is not detected to a second height h2A third height h3In the case of the reverse straightening signal, the first height h is implemented1According to the reverse straightening signal, the roll gap of the hot straightening machine is raised to 200mm, and the steel plate moves towards the direction of a cooling bed on a conveying roller way until the head of the steel plate enters the hot straightening machine for a distance of 2 meters; when the first height h1A second height h2And a third height h3When the reverse straightening signals are not collected, the hot straightening machine executes a normal straightening process.
The invention has the following beneficial effects:
1. the invention can realize automatic monitoring of the warping condition of the head of the steel plate, replaces manual observation to screen out unqualified steel plates with warped heads, and has accurate monitoring and high reliability.
2. According to the invention, when the warping height of the head of the steel plate exceeds the limit height H, the PLC control system gives an alarm to prompt an operator to manually cut off the warping part of the steel plate exceeding the limit height H, so that the stable operation of a thermal straightening process is ensured; when the warping height of the head of the steel plate is not more than the limit height H, the warping height is judged through the laser cold detection device, an anti-straightening signal is automatically judged and selected and fed back to the PLC control system, the roll gap lifting height of the hot straightening machine and the distance of the head of the steel plate entering the hot straightening machine are adjusted, and the anti-straightening steel plate enables the steel plate to be flat and meets the production requirements.
Drawings
FIG. 1 is a schematic view of a detecting and straightening apparatus for detecting and straightening a head portion of a hot rolled steel sheet according to the present invention.
FIG. 2 is a schematic view of a laser cold testing apparatus for detecting and straightening the head portion of a hot rolled steel sheet according to the present invention.
Among them are: 1. a rolling mill; 2. a rollgang; 3. a thermal straightener; 4. a laser cold inspection device; 5. and (4) cooling the bed.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
A method for detecting and straightening warping of a head of a hot-rolled steel plate specifically comprises the following steps:
step 1, the head of a part of steel plate is warped before entering a hot straightening process, namely the phenomenon of 'warping and buckling'. If the processing can not be found in time after the situation of the 'warping buckle head' occurs, the angle of the cooling water sprayed to the surface of the steel plate can be changed after the ultra-fast cooling process of the steel plate, so that the cooling situation of the head and the tail of the steel plate and the execution of the cooling process are changed. The performance of the steel plate can be affected by slight warping, and the steel plate can directly impact the body equipment of the cooling system when the steel plate is seriously warped, so that the steel rolling cooling equipment is damaged. As shown in figure 1, before a steel plate rolled by a rolling mill 1 enters a cooling bed 5, a laser cold detection device 4 is needed, the laser cold detection device 4 can realize automatic monitoring of the warping condition of the head of the steel plate, the unqualified steel plate with the warped head is screened out by replacing manual observation, and the monitoring is accurate and the reliability is high.
As shown in fig. 2, the transmitter and the receiver of the laser cold inspection device 4 are respectively arranged at two sides of the steel plate in the advancing direction and are located at the same height; the laser cold detection device 4 is provided with a plurality of groups of detection heights in the vertical direction, and the detection heights from low to high are first heights h1A second height h2… … nth height hnWherein n is a positive integer; the laser cold detection device 4 is also provided with a group of limit heights H, and the limit heights H are higher than the nth heighthn。
And 2, the steel plate moves to the cooling bed through the conveying roller way 2, when the head of the steel plate is warped and shields the signal receiving between the transmitter and the receiver of the laser cold detection device 4, an anti-straightening signal can be triggered, and the anti-straightening signal is transmitted to the PLC control system through acquisition.
If the signal of the laser cold detection device 4 is not blocked by the warping of the head of the steel plate, the hot straightening machine 3 executes a normal straightening process when the PLC control system does not receive an anti-straightening signal, and the straightening direction is the direction of the rolling mill 1 towards the cooling bed 5; on the contrary, if the signal of the laser cold detection device 4 is blocked by the warpage of the head of the steel plate, and the PLC control system receives the reverse straightening signal, the hot straightening machine 3 executes the reverse straightening process, and the straightening direction is the direction of the cold bed 5 towards the rolling mill 1.
And 5, after the head of the steel plate is leveled by the hot straightener 3, the steel plate continues to perform a normal straightening process, and the rest part of the steel plate is straightened.
The laser cold detection device 4 in the step 1 is provided with 3 groups of detection heights which are respectively a first height h1A second height h2And a third height h3(ii) a First height h180-120 mm, secondHeight h2130-170 mm, third height h3Is 180-220 mm.
This is further described below in connection with preferred embodiment 1.
In the aspect of objectivity, based on the objective limit of the performance of the hot straightener 3 and the quality of the steel plate coming from the hot straightener, the position where the steel plate needing to be straightened warps is basically located at the head of the steel plate, the general limit height of the warping is 350mm, the steel plate with the warping height exceeding 350mm is an unqualified steel plate, and the straightening necessity is lost, so that the limit height H of the steel plate is 350mm at most. On the basis of the height h1Is 100mm, the second height h2Is 150mm, and a third height h3200mm is the optimum detection height setting for the present invention.
When the first height h is acquired simultaneously1A second height h2And a third height h3When the signal is inverted, the third height h is implemented3According to the reverse straightening signal, the roll gap of the hot straightening machine 3 is raised to 300mm, and the steel plate moves towards the direction of the cooling bed 5 on the conveying roller bed 2 until the head of the steel plate enters the hot straightening machine 3 for a distance of 4 meters; when the first height h is acquired simultaneously1A second height h2Is not detected to a third height h3In the case of the reverse straightening signal, the second height h is implemented2According to the reverse straightening signal, the roll gap of the hot straightening machine 3 is raised to 250mm, and the steel plate moves towards the direction of the cooling bed 5 on the conveying roller bed 2 until the head of the steel plate enters the hot straightening machine 3 for a distance of 3 meters; when the first height h is acquired1Is not detected to a second height h2A third height h3In the case of the reverse straightening signal, the first height h is implemented1According to the reverse straightening signal, the roll gap of the hot straightening machine 3 is raised to 200mm, and the steel plate moves towards the direction of the cooling bed 5 on the conveying roller bed 2 until the head of the steel plate enters the hot straightening machine 3 by a distance of 2 meters; when the first height h1A second height h2And a third height h3When the reverse straightening signals are not collected, the hot straightening machine 3 executes a normal straightening process.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (6)
1. A method for detecting and straightening the head warping of a hot-rolled steel plate is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, the steel plate rolled by the rolling mill (1) passes through a laser cold inspection device (4) before entering a cooling bed (5); the transmitter and the receiver of the laser cold detection device (4) are respectively arranged at two sides of the advancing direction of the steel plate and are positioned at the same height; the laser cold detection device (4) is provided with a plurality of groups of detection heights in the vertical direction, and the detection heights from low to high are first heights h1A second height h2… … nth height hnWherein n is a positive integer; the laser cold detection device (4) is also provided with a group of limit heights H, and the limit heights H are higher than the nth height Hn；
Step 2, the steel plate moves to a cooling bed through a conveying roller way (2), when the head of the steel plate is warped to shield the signal reception between a transmitter and a receiver of the laser cold detection device (4), a reverse straightening signal can be triggered, and the reverse straightening signal is transmitted to a PLC control system through acquisition;
step 3, when the PLC control system receives an anti-straightening signal of the limit height H, the PLC control system automatically stops straightening the steel plate, and the picture alarm prompts an operator to manually cut off the warping part exceeding the limit height H of the steel plate; after the reverse straightening signal of the limit height H disappears, continuing the straightening work;
step 4, when the PLC control system receives the nth height hnN-1 th height hn-1… … first height h1Automatically judging and selecting the n-th height h with the highest execution height during the reverse straightening signalnThe reverse straightening signal of (1); the roll gap of the hot straightening machine (3) is raised by hn+100mm, the steel plate moves to the direction of the cooling bed on the conveying roller way (2) until the head of the steel plate enters the hot straightening machine (3) for a distance of 2-4 m, the roller of the hot straightening machine (3) is pressed downwards to recover the straightening roll gap in normal operation,the steel plate moves towards the rolling mill (1) on the conveying roller way (2) until the head of the steel plate exits from the hot straightening machine (3), and the head of the steel plate is warped, namely, is reversely straightened and flattened by the hot straightening machine (3);
and 5, after the head of the steel plate is leveled by the hot straightener (3), the steel plate continues to perform a normal straightening process, and the rest part of the steel plate is straightened.
2. The method for detecting and straightening the head portion warpage of a hot rolled steel sheet according to claim 1, characterized in that: in the step 2, if the signal of the laser cold detection device (4) is not blocked by the warping of the steel plate head, the hot straightening machine (3) executes a normal straightening process when the PLC control system does not receive an anti-straightening signal, wherein the straightening direction is the direction of the rolling mill (1) towards the cooling bed (5); on the contrary, if the signal of the laser cold detection device (4) is blocked by the warping of the head of the steel plate, and the PLC control system receives the reverse straightening signal, the hot straightening machine (3) executes a reverse straightening process, and the straightening direction is the direction of the cooling bed (5) towards the rolling mill (1).
3. The method for detecting and straightening the head portion warpage of a hot rolled steel sheet according to claim 1, characterized in that: the maximum limit height H of the steel plate in the step 1 is 350 mm.
4. The method for detecting and straightening the head portion warpage of a hot rolled steel sheet according to claim 1, characterized in that: the laser cold detection device (4) in the step 1 is provided with 3 groups of detection heights which are respectively a first height h1A second height h2And a third height h3(ii) a First height h1Is 80-120 mm and has a second height h2130-170 mm, third height h3Is 180-220 mm.
5. The method for detecting and straightening the head portion warpage of a hot rolled steel sheet according to claim 4, characterized in that: first height h1Is 100mm, the second height h2Is 150mm, and a third height h3Is 200 mm.
6. The method for detecting and straightening the head portion warpage of a hot rolled steel sheet according to claim 5, characterized in that: when the first height h is acquired simultaneously1A second height h2And a third height h3When the signal is inverted, the third height h is implemented3According to the reverse straightening signal, the roll gap of the hot straightening machine (3) is raised to 300mm, and the steel plate moves towards the direction of the cooling bed (5) on the conveying roller way (2) until the head of the steel plate enters the hot straightening machine (3) for a distance of 4 meters; when the first height h is acquired simultaneously1A second height h2Is not detected to a third height h3In the case of the reverse straightening signal, the second height h is implemented2According to the reverse straightening signal, the roll gap of the hot straightening machine (3) is raised to 250mm, and the steel plate moves towards the direction of the cooling bed (5) on the conveying roller way (2) until the head of the steel plate enters the hot straightening machine (3) for a distance of 3 meters; when the first height h is acquired1Is not detected to a second height h2A third height h3In the case of the reverse straightening signal, the first height h is implemented1According to the reverse straightening signal, the roll gap of the hot straightening machine (3) is raised to 200mm, and the steel plate moves towards the direction of the cooling bed (5) on the conveying roller way (2) until the head of the steel plate enters the hot straightening machine (3) for a distance of 2 meters; when the first height h1A second height h2And a third height h3When the reverse straightening signals are not collected, the hot straightening machine (3) executes a normal straightening process.
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| CN202111551810.2A CN114289525B (en) | 2021-12-17 | 2021-12-17 | Method for detecting and straightening head warpage of hot rolled steel plate |
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| CN202111551810.2A CN114289525B (en) | 2021-12-17 | 2021-12-17 | Method for detecting and straightening head warpage of hot rolled steel plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116037654A (en) * | 2023-04-03 | 2023-05-02 | 江苏瑞邦复合材料科技有限公司 | Rolling method and rolling equipment for ultrathin copper-aluminum composite foil |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000071003A (en) * | 1998-08-28 | 2000-03-07 | Sumitomo Metal Ind Ltd | Thick steel plate manufacturing method and device |
| CN103537486A (en) * | 2013-10-29 | 2014-01-29 | 首钢总公司 | Control method for buckling deformation of hot rolled open flat |
| CN112024642A (en) * | 2020-08-24 | 2020-12-04 | 江苏省沙钢钢铁研究院有限公司 | Automatic hot straightening method for steel plate |
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- 2021-12-17 CN CN202111551810.2A patent/CN114289525B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000071003A (en) * | 1998-08-28 | 2000-03-07 | Sumitomo Metal Ind Ltd | Thick steel plate manufacturing method and device |
| CN103537486A (en) * | 2013-10-29 | 2014-01-29 | 首钢总公司 | Control method for buckling deformation of hot rolled open flat |
| CN112024642A (en) * | 2020-08-24 | 2020-12-04 | 江苏省沙钢钢铁研究院有限公司 | Automatic hot straightening method for steel plate |
Non-Patent Citations (1)
| Title |
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| 岳临萍;: "强力矫直机控制模式分析及应用", 电气应用, no. 04, 20 February 2010 (2010-02-20) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116037654A (en) * | 2023-04-03 | 2023-05-02 | 江苏瑞邦复合材料科技有限公司 | Rolling method and rolling equipment for ultrathin copper-aluminum composite foil |
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