CN113263062B - Control method and device for loop of hot continuous rolling finishing mill unit - Google Patents
Control method and device for loop of hot continuous rolling finishing mill unit Download PDFInfo
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- CN113263062B CN113263062B CN202110729459.5A CN202110729459A CN113263062B CN 113263062 B CN113263062 B CN 113263062B CN 202110729459 A CN202110729459 A CN 202110729459A CN 113263062 B CN113263062 B CN 113263062B
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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
- B21B37/48—Tension control; Compression control
- B21B37/50—Tension control; Compression control by looper control
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Abstract
The application discloses a control method of a loop of a hot continuous rolling finishing mill group, which comprises the steps of increasing the rolling tension of an upstream rack of a throwing frame before rolling; when the head is rolled, after the lower rack of the rack throwing machine is bitten by steel for a preset time, the loop angle of the rack throwing machine is increased to a first preset angle; when the tail part is rolled, after the upper rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced to a second preset angle; and when the tail part is rolled, after the frame at the lower part of the rack throwing frame throws steel, the loop angle of the rack throwing frame is reduced to the original position. The method for controlling the loop of the hot continuous rolling finishing mill unit can effectively avoid finish rolling scratches of the strip steel on the basis of not increasing the cost. The invention also provides a control device of the loop of the hot continuous rolling finishing mill group, which has the same advantages as the control method of the loop of the hot continuous rolling finishing mill group.
Description
Technical Field
The invention belongs to the technical field of rolled surface quality control, and particularly relates to a method and a device for controlling a loop of a hot continuous rolling finishing mill set.
Background
In the production process of hot continuous rolling strip steel, the loop device is an important component part for tension control in the rolling process, the loop device is mainly used for detecting the loop quantity between the racks and realizing the tension control, the speed of the upstream rack is controlled by detecting a loop quantity signal, the rotating speed of main transmission can be rapidly and accurately adjusted, the deviation of the strip speed is corrected, the fluctuation of the width and the thickness of the strip steel caused by the tension fluctuation is avoided, and the normal rolling production is ensured. Under the condition of the throwing frame rolling, a loop of the throwing frame rack does not participate in tension control, namely the rolling process does not act when moving at an initial position, the tension is controlled by an upstream loop of the throwing frame rack, the position of the loop is at a 10-degree reference position, and the tension of the strip steel is controlled by the upstream rack loop of the throwing frame rack. However, the space between the throwing frame rolling mills is changed from 5 meters to 10 meters, and the throwing frame rolling is in a thick specification, so that the unit color temperature and the unit weight are large, and the strip steel is frequently contacted with the rear guard plate of the throwing frame in the throwing frame rolling process under the superposition effect of the space between the mills and the unit weight. The surface scratch defect is generated, the rolling line needs to stop rolling and pulling rollers after the scratch defect is generated, the rear guard plate is polished, the scratch roll needs quality repair treatment, the yield and the quality of the rolling line can be seriously influenced, and therefore the scratch defect needs to be treated.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for controlling a loop of a hot continuous rolling finishing mill group, which can effectively avoid finish rolling scratches of strip steel on the basis of not increasing the cost.
The invention provides a method for controlling a loop of a hot continuous rolling finishing mill group, which comprises the following steps:
before rolling, increasing the rolling tension of a rack on the upstream of the throwing frame;
when the head is rolled, after the downstream frame of the rack throwing machine bites steel for a preset time, the loop angle of the rack throwing machine is increased to a first preset angle;
when the tail part is rolled, after the upper rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced to a second preset angle;
and when the tail part is rolled, after the frame at the lower part of the rack throwing frame throws steel, the loop angle of the rack throwing frame is reduced to the original position.
Preferably, in the method for controlling a loop of a hot continuous rolling finishing mill group, the step of increasing the rolling tension of the upstream stand of the throwing rack before rolling is as follows:
before rolling, the rolling tension of the frame at the upstream of the throwing frame is changed from 10N/mm2Increase to 12N/mm2。
Preferably, in the method for controlling the loop of the hot continuous rolling finishing mill group, when the head is rolled, after the frame downstream of the throwing frame bites steel for a preset time, the angle of the loop of the throwing frame is increased to a first preset angle:
when the head is rolled, the loop angle of the throwing frame is increased from 10 degrees to 20 degrees after the frame at the lower part of the throwing frame bites steel for 1 second.
Preferably, in the method for controlling the loop of the hot continuous rolling finishing mill group, when the tail is rolled, after the frame upstream of the throwing frame throws steel, the angle of the loop of the throwing frame is reduced to a second preset angle:
when the tail part is rolled, after the frame at the upstream of the throwing frame throws steel, the loop angle of the throwing frame is reduced from 20 degrees to 15 degrees.
Preferably, in the method for controlling the loop of the hot continuous rolling finishing mill group, when the tail is rolled, after the frame downstream of the throwing frame throws steel, the angle of the loop of the throwing frame is reduced to the original position:
when the tail part is rolled, after the frame at the downstream of the throwing frame throws steel, the loop angle of the throwing frame is reduced from 15 degrees to 10 degrees.
The invention provides a control device for a loop of a hot continuous rolling finishing mill group, which comprises:
the rolling tension increasing component is used for increasing the rolling tension of the rack on the upstream of the throwing rack before rolling;
the throwing frame machine frame loop angle improving component is used for improving the throwing frame machine frame loop angle to a first preset angle after a machine frame at the lower part of the throwing frame machine frame bites steel for a preset time when the head is rolled;
the frame throwing rack loop angle reducing component is used for reducing the frame throwing rack loop angle to a second preset angle after a frame at the upstream of the frame throwing rack throws steel when the tail part is rolled;
and the throwing frame loop angle recovery in-situ component is used for reducing the throwing frame loop angle to the original position after a frame at the downstream of the throwing frame throws steel when the tail is rolled.
Preferably, in the control device for a loop of a hot continuous rolling finishing mill train as described above, the rolling tension increasing means is specifically configured to change the rolling tension of the stand upstream of the throwing stand from 10N/mm before rolling2Increase to 12N/mm2。
Preferably, in the control device for the loop of the hot continuous rolling finishing mill group, when the throwing frame loop angle increasing component is specifically used for rolling the head, the throwing frame loop angle is increased from 10 ° to 20 ° after the frame downstream of the throwing frame bites steel for 1 second.
Preferably, in the control device for the loop of the hot continuous rolling finishing mill group, when the loop angle reducing component of the rack throwing machine is specifically used for rolling the tail, after the rack upstream of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced from 20 ° to 15 °.
Preferably, in the control device for the loop of the hot continuous rolling finishing mill group, when the loop angle recovery component of the rack throwing machine is specifically used for rolling the tail, after the downstream rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced from 15 degrees to 10 degrees.
According to the control method of the loop of the hot continuous rolling finishing mill unit, which is provided by the invention, the rolling tension of the upstream rack of the throwing frame is increased before rolling, so that the loop quantity can be increased, and the loop angle of the upstream rack can be increased; when the head is rolled, after the lower rack of the throwing rack bites steel for a preset time, the loop angle of the throwing rack is increased to a first preset angle, so that the defect that the strip steel is scratched due to contact with a rear guard plate of the throwing rack can be avoided; when the tail is rolled, after the frame at the upper part of the throwing frame throws steel, the loop angle of the throwing frame is reduced to a second preset angle, so that abnormal production caused by the fact that the strip steel does not stretch the loop when the tail is rolled can be avoided; and finally, when the tail part is rolled, after the lower rack of the rack throwing rack throws steel, the loop angle of the rack throwing rack is reduced to the original position to prepare for the production of the next steel, so that the method can effectively avoid finish rolling and scratching of the strip steel on the basis of not increasing the cost. The control device provided by the invention has the same advantages as the method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of an embodiment of a method for controlling a loop of a hot continuous rolling finishing mill group according to the present invention;
fig. 2 is a schematic diagram of an embodiment of a control device for a loop of a hot continuous rolling finishing mill group provided by the invention;
FIG. 3 is a schematic diagram of the average number of scratches of a finish rolling month before and after the loop control method is implemented.
Detailed Description
The core of the invention is to provide a method and a device for controlling the loop of the hot continuous rolling finishing mill group, which can effectively avoid finish rolling scratches of strip steel on the basis of not increasing the cost.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of an embodiment of a method for controlling a loop of a hot continuous rolling finishing mill group according to the present invention, where the method includes:
s1: before rolling, increasing the rolling tension of a frame at the upstream of the throwing frame;
it should be noted that the rolling tension of the upstream stand may be, but is not limited to, 10N/mm2Increase to 12N/mm2Or to a level greater than 12N/mm2By increasing the tension of the upstream frame of the throwing frame, the loop amount can be increased, and the loop angle of the upstream frame can be increased.
S2: when the head is rolled, after the lower rack of the rack throwing machine is bitten by steel for a preset time, the loop angle of the rack throwing machine is increased to a first preset angle;
it should be noted that the preset time can be, but is not limited to, 1 second, the loop angle of the throwing frame can be, but is not limited to, adjusted from 10 degrees to 20 degrees, the loop is automatically lifted, and the scratch defect caused by the contact of the strip steel and the rear guard of the throwing frame can be avoided by lifting the loop angle.
S3: when the tail part is rolled, after the frame at the upper part of the throwing frame throws steel, the loop angle of the throwing frame is reduced to a second preset angle;
it should be noted that in the step, the loop angle of the rack throwing frame can be adjusted from 20 degrees to 15 degrees, and here, by reducing the loop angle in advance, abnormal production caused by the fact that the strip steel is not stretched and looped when the tail is rolled can be avoided.
S4: and when the tail part is rolled, after the frame at the lower part of the rack throwing frame throws steel, the loop angle of the rack throwing frame is reduced to the original position.
It should be noted that, in this step, the loop angle of the rack throwing machine can be adjusted from 15 degrees to 10 degrees, and after the rack throwing machine returns to the original position, the production of the next piece of steel can be prepared.
As can be seen from the above description, in the embodiment of the method for controlling the loop of the hot continuous rolling finishing mill unit, because the rolling tension of the upstream frame of the throwing frame is increased before rolling, the loop amount and the loop angle of the upstream frame can be increased; when the head is rolled, after the lower rack of the throwing rack bites steel for a preset time, the loop angle of the throwing rack is increased to a first preset angle, so that the defect that the strip steel is scratched due to contact with a rear guard plate of the throwing rack can be avoided; when the tail is rolled, after the frame at the upper part of the throwing frame throws steel, the loop angle of the throwing frame is reduced to a second preset angle, so that abnormal production caused by the fact that the strip steel does not stretch the loop when the tail is rolled can be avoided; and finally, when the tail part is rolled, after the downstream rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced to the original position, and preparation is made for the production of next steel, so that the method can effectively avoid finish rolling scratch of the strip steel on the basis of not increasing the cost.
Fig. 2 shows an embodiment of a control device for a loop of a finishing hot rolling mill set according to the present invention, where fig. 2 is a schematic diagram of an embodiment of a control device for a loop of a finishing hot rolling mill set according to the present invention, and the device may include:
a rolling tension increasing component 201 for increasing the rolling tension of the upstream frame of the throwing rack before rolling, wherein the rolling tension of the upstream frame can be, but is not limited to, 10N/mm2Increase to 12N/mm2Or up to more than 12N/mm2The loop quantity and the loop angle of the upstream rack are improved by increasing the tension of the upstream rack of the rack throwing machine;
the throwing frame stand loop angle improving component 202 is used for improving the throwing frame stand loop angle to a first preset angle after a stand at the lower part of the throwing frame stand bites steel for preset time when the head is rolled, wherein the preset time can be but is not limited to 1 second, the throwing frame stand loop angle can be but is not limited to be adjusted to 20 degrees from 10 degrees, the loop is automatically lifted, and the condition that the strip steel is in contact with a rear guard plate of the throwing frame stand to generate scratch defects is avoided by improving the loop angle;
the throwing frame loop angle reducing component 203 is used for reducing the throwing frame loop angle to a second preset angle after a frame at the upstream of the throwing frame throws steel when the tail is rolled, specifically, the throwing frame loop angle can be adjusted from 20 degrees to 15 degrees, and abnormal production caused by that the strip steel is not stretched and rises when the tail is rolled is avoided by reducing the loop angle in advance;
the throwing frame loop angle restoring component 204 is used for reducing the throwing frame loop angle to the original position after a frame at the lower part of the throwing frame throws steel when the tail part is rolled, specifically, the throwing frame loop angle can be adjusted from 15 degrees to 10 degrees, and after the frame returns to the original position, preparation can be made for next steel production.
An example of the practice using the above method and apparatus is shown in fig. 3, where fig. 3 is a schematic diagram of the average number of scratches in the finish rolling month before and after the loop control method is performed.
The loop angle control is carried out on the hot rolling line from 7 months in 2020, and the finish rolling scratch defect is controlled to be reduced from 24 coils per month before implementation to 5.75 coils per month, so that the improvement effect is obvious.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A control method for a loop of a hot continuous rolling finishing mill group is characterized by comprising the following steps:
before rolling, increasing the rolling tension of a frame at the upstream of the throwing frame;
when the head is rolled, after the lower rack of the rack throwing machine is bitten by steel for a preset time, the loop angle of the rack throwing machine is increased to a first preset angle;
when the tail part is rolled, after the upper rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced to a second preset angle;
when the tail part is rolled, after the frame at the lower part of the throwing frame throws steel, the loop angle of the throwing frame is reduced to the original position;
the rolling tension of the upstream frame of the throwing frame is increased before rolling:
before rolling, the rolling tension of the frame at the upstream of the throwing frame is adjusted to 10N/mm2Increase to 12N/mm2；
During head rolling, after the lower rack of the throwing rack bites steel for a preset time, the loop angle of the throwing rack is increased to a first preset angle:
when the head is rolled, after a frame at the lower part of the throwing frame bites steel for 1 second, the loop angle of the throwing frame is improved from 10 degrees to 20 degrees;
during rolling of the tail part, after the upper rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced to a second preset angle:
when the tail part is rolled, after the upper rack of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced from 20 degrees to 15 degrees;
during rolling of the tail part, after the downstream frame of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced to the original position:
when the tail part is rolled, after the frame at the downstream of the throwing frame throws steel, the loop angle of the throwing frame is reduced from 15 degrees to 10 degrees.
2. A control device for a loop of a hot continuous rolling finishing mill group is characterized by comprising:
the rolling tension increasing component is used for increasing the rolling tension of the rack on the upstream of the throwing rack before rolling;
the throwing frame machine frame loop angle improving component is used for improving the throwing frame machine frame loop angle to a first preset angle after a machine frame at the lower part of the throwing frame machine frame bites steel for a preset time when the head is rolled;
the frame throwing rack loop angle reducing component is used for reducing the frame throwing rack loop angle to a second preset angle after a frame at the upstream of the frame throwing rack throws steel when the tail part is rolled;
the throwing frame machine frame loop angle recovery in-situ component is used for reducing the throwing frame machine frame loop angle to the in-situ position after a machine frame at the downstream of the throwing frame machine frame throws steel when rolling the tail;
the rolling tension increasing component is particularly used for increasing the rolling tension of the rack upstream of the throwing rack to 10N/mm before rolling2Increase to 12N/mm2；
When the loop angle improving component of the rack is particularly used for rolling the head, the loop angle of the rack is improved from 10 degrees to 20 degrees after the downstream rack of the rack bites steel for 1 second;
when the loop angle reducing component of the rack throwing machine is particularly used for rolling the tail part, after the rack at the upstream of the rack throwing machine throws steel, the loop angle of the rack throwing machine is reduced from 20 degrees to 15 degrees;
when the in-situ component for restoring the angle of the loop of the rack throwing machine is particularly used for rolling the tail, the angle of the loop of the rack throwing machine is reduced from 15 degrees to 10 degrees after a rack at the downstream of the rack throwing machine throws steel.
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| JP4140349B2 (en) * | 2002-11-11 | 2008-08-27 | 愛知製鋼株式会社 | Centering method and centering apparatus for rolling mill |
| JP2006341275A (en) * | 2005-06-09 | 2006-12-21 | Daido Steel Co Ltd | Rolling apparatus |
| CN202105855U (en) * | 2011-03-29 | 2012-01-11 | 河北钢铁股份有限公司邯郸分公司 | Hot rolling split flexible coupler of encoder |
| CN103170507B (en) * | 2013-03-26 | 2014-11-05 | 鞍钢股份有限公司 | Method for preventing surface of strip steel from being scratched when strip steel passes through finishing mill |
| CN104209341B (en) * | 2014-09-03 | 2016-01-27 | 山西太钢不锈钢股份有限公司 | Hot continuous rolling silicon steel kink is added to locking control method |
| CN104249082A (en) * | 2014-09-23 | 2014-12-31 | 山西太钢不锈钢股份有限公司 | Method for controlling loops of hot continuous rolling mills for special steel with thick specifications during technological idle setting |
| CN105728460B (en) * | 2016-03-08 | 2018-02-13 | 首钢京唐钢铁联合有限责任公司 | Method for preventing thick strip steel from being scratched between finishing mill frames |
| CN111618092B (en) * | 2020-06-01 | 2022-05-03 | 宝钢湛江钢铁有限公司 | Control method for reducing scratch defects of thick plate finish rolling |
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