CN109967532B - Method for preventing hot-rolled strip finishing mill group from slipping - Google Patents
Method for preventing hot-rolled strip finishing mill group from slipping Download PDFInfo
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- CN109967532B CN109967532B CN201910228976.7A CN201910228976A CN109967532B CN 109967532 B CN109967532 B CN 109967532B CN 201910228976 A CN201910228976 A CN 201910228976A CN 109967532 B CN109967532 B CN 109967532B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/06—Pushing or forcing work into pass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
Abstract
The application discloses a method for preventing a hot-rolled strip finishing mill group from slipping, which comprises the following steps: a steel feeding speed adjusting block and a steel feeding speed coefficient control block connected with the steel feeding speed adjusting block are arranged in the hot coil box control module; judging whether the current production process has the risk of slipping of an F1 unit; if the F1 unit slip risk exists, starting a steel feeding speed coefficient control block to adjust the numerical value of the steel feeding speed coefficient; the steel conveying speed adjusting block adjusts the steel conveying speed according to the adjusted steel conveying speed coefficient; and the adjusted steel conveying speed and the speed of the F1 machine set generate a speed difference, and the strip steel is forcibly pushed into the roll of the F1 machine set by external force generated by the speed difference. The method adjusts the steel feeding speed of the hot coil box, and forces the strip steel to be pushed into the F1 roller of the finishing mill group by using the external force formed by the speed difference between the hot coil box and the finishing mill group F1, thereby improving the strip steel biting condition, preventing the strip steel of the finishing mill group F1 from slipping, and reducing the scrap piling and quality accidents caused by the slipping of the strip steel.
Description
Technical Field
The application relates to the technical field of metallurgical hot rolling, in particular to a method for preventing a hot-rolled strip steel finishing mill group from slipping.
Background
In the current domestic mainstream hot-rolled broadband production line, a hot coil box process is generally arranged, and the hot coil box mainly has the functions of coiling an intermediate blank rolled by a roughing mill set into an intermediate coil in front of a finishing mill set, and reversely uncoiling the intermediate coil through an uncoiling arm so that the head and the tail of the intermediate blank are reversely conveyed into a head frame F1 of the finishing mill set.
However, the first stand F1 of the finishing mill group has process instability compared with other mill groups, and the rolling reduction of F1 is large, so that the problem that the strip steel is difficult to bite is easily caused, which is commonly called as F1 slipping. Once the F1 slipping phenomenon occurs, equipment damage and shutdown or strip quality defect caused by the sleeve opening in the middle of the strip steel can seriously cause the strip steel scrap accident.
Disclosure of Invention
The application provides a method for preventing a hot-rolled strip finishing mill group from slipping, which aims to solve the problems that the process of a first frame F1 of the existing finishing mill group is unstable and the biting and slipping are easy to occur.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the embodiment of the application discloses a method for preventing a hot-rolled strip finishing mill group from slipping, which comprises the following steps:
a steel feeding speed adjusting block and a steel feeding speed coefficient control block connected with the steel feeding speed adjusting block are arranged in the hot coil box control module;
judging whether the current production process has the risk of slipping of an F1 unit;
if the F1 unit slip risk exists, starting a steel feeding speed coefficient control block to adjust the numerical value of the steel feeding speed coefficient;
the steel conveying speed adjusting block adjusts the steel conveying speed according to the adjusted steel conveying speed coefficient;
and the adjusted steel conveying speed and the speed of the F1 machine set generate a speed difference, and the strip steel is forcibly pushed into the roll of the F1 machine set by external force generated by the speed difference.
Optionally, judging whether there is a slip risk of the F1 unit in the current production process, includes:
recording the time interval between the detection time point of the hot metal detector and the steel biting signal establishment time of the F1 rolling mill;
judging whether the time interval exceeds a preset threshold value or not;
if the time interval exceeds a preset threshold value, the current production process is indicated to have the risk of slipping of the F1 unit.
Optionally, judging whether there is a slip risk of the F1 unit in the current production process, includes:
acquiring the change condition of rolling force data fed back by a pressure sensor after the F1 machine set bites the strip steel;
judging whether the rolling force data change condition is consistent with a preset data change condition or not;
and if the change condition of the rolling force data is inconsistent with the preset data change condition, indicating that the F1 unit slip risk exists in the current production process.
Optionally, if there is a slip risk of the F1 machine set, the steel feeding speed coefficient control block is started to adjust the value of the steel feeding speed coefficient, including:
if the current production process has the risk of slipping of the F1 machine set, starting a steel feeding speed coefficient control block;
and setting the steel conveying speed coefficient to be a numerical value which is larger than 1 and is within an adjusting range through the steel conveying speed coefficient control block.
Optionally, the adjustment range of the steel conveying speed coefficient includes: 1 to 1.05.
Optionally, the steel feeding speed adjusting block adjusts the steel feeding speed according to the adjusted steel feeding speed coefficient, and the method includes:
the steel conveying speed adjusting block receives the adjusted numerical value of the steel conveying speed coefficient;
when the hot metal detector detects the intermediate billet, the hot metal detector sends a trigger signal to the steel feeding speed adjusting block;
and the steel feeding speed adjusting block adjusts the rotating speed of the conveying roller way below the intermediate billet according to the steel feeding speed coefficient so as to adjust the steel feeding speed.
The embodiment of the application provides a method for preventing a hot-rolled strip finishing mill group from slipping, which comprises the following steps: a steel feeding speed adjusting block and a steel feeding speed coefficient control block connected with the steel feeding speed adjusting block are arranged in the hot coil box control module; judging whether the current production process has the risk of slipping of an F1 unit; if the F1 unit slip risk exists, starting a steel feeding speed coefficient control block to adjust the numerical value of the steel feeding speed coefficient; the steel conveying speed adjusting block adjusts the steel conveying speed according to the adjusted steel conveying speed coefficient; the speed difference is generated between the adjusted steel conveying speed and the speed of the F1 machine set, and the strip steel is forcibly pushed into the roller of the F1 machine set by external force generated by the speed difference. According to the method for preventing the hot-rolled strip steel finishing mill group from slipping, the steel feeding speed of the hot coil box strip steel is properly increased by adjusting the steel feeding speed coefficient, so that the speed difference between the steel feeding speed of the hot coil box and the speed of the finishing mill group F1 is formed, the strip steel is forcibly pushed into the finishing mill group F1 roller by using the external force formed by the speed difference, the biting condition can be improved, the slipping of the finishing mill group F1 strip steel is prevented, waste piling and quality accidents caused by the slipping of the strip steel are reduced, and the production stability of the hot-rolled strip steel is effectively improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an exemplary hot box and finishing train F1;
FIG. 2 is a flowchart of a method for preventing a finishing train of a hot rolled strip from slipping according to an embodiment of the present disclosure;
FIG. 3A is a schematic view showing a load change in a normal bite of a strip steel;
FIG. 3B is a schematic view showing a load change at the time of slipping of a strip steel;
FIG. 4 is a schematic diagram of a steel feeding speed coefficient control block in the method for preventing a finishing mill group of a hot-rolled strip steel from slipping according to an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating forced biting of a hot strip in the method for preventing a finishing mill group of a hot rolled strip from slipping according to an embodiment of the present application;
fig. 6 is a schematic view of a bite angle in the method for preventing a finishing mill group of a hot-rolled strip from slipping according to the embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
As shown in FIG. 1, the hot rolled steel strip is in an automatic rolling mode, and the intermediate slab of the steel strip is uncoiled in a hot coil boxThen at an unwinding speed V0And (4) conveying the strip steel to a finishing mill group, wherein after the strip steel passes through a hot spot of an HMD406, the speed of the strip steel is changed from an uncoiling speed to a steel conveying speed V' along with the speed V of a finishing mill group F1. However, the strip head suffers bite slip at the finishing mill F1 due to the principles of unreasonable thickness, unreasonable elevation, and poor head shape of the intermediate billet.
In order to solve the above problems, embodiments of the present application provide a method for preventing a hot-rolled strip finishing mill from slipping, by which a strip can be easily bitten into a first stand F1 of the finishing mill from a hot-rolling box device, thereby improving production stability of the hot-rolled strip and reducing labor intensity of workers.
As shown in fig. 2, a method for preventing a finishing mill group of a hot-rolled strip from slipping according to an embodiment of the present application includes:
s100: and a steel feeding speed adjusting block and a steel feeding speed coefficient control block connected with the steel feeding speed adjusting block are arranged in the hot coil box control module.
And adding a steel feeding speed adjusting block in the hot coil box control module, setting a steel feeding speed coefficient control block in a hot coil box parameter setting picture, and well connecting the adjusting block and the control block, wherein the steel feeding speed adjusting block can adjust the steel feeding speed of the intermediate billet according to the steel feeding speed coefficient displayed by the steel feeding speed coefficient control block.
S200: and judging whether the current production process has the risk of slipping of the F1 unit.
The strip steel intermediate billet is fed into the finishing mill group F1 to cause the slipping risk, which mainly means that the strip steel is difficult to bite into the finishing mill, and an operator can actually check whether the strip steel normally bites into the mill on site, so that whether the slipping risk of the F1 unit exists in the current production process is judged.
Besides the fact that whether the F1 unit slipping risk exists or not is checked through an operator, judgment can be conducted from the trend recorded by the model, for example, judgment can be conducted according to the strip steel biting signal establishing time, the load establishing change trend and the like.
1) Judging from the steel biting signal establishment: recording the time interval between the detection time point of the hot metal detector and the steel biting signal establishment time of the F1 rolling mill; judging whether the time interval exceeds a preset threshold value or not; and thirdly, if the time interval exceeds a preset threshold value, the current production process has the risk of slipping of the F1 unit.
For example, when the intermediate strip steel is normally bitten into the F1 machine set, the HMD (hot metal Detector) 406 detects that the time interval between the HMD406 detection time point and the steel biting signal establishment time interval of the F1 machine set is 9.54s (preset threshold), and when the strip steel slips, the time interval between the HMD406 detection time point and the steel biting signal establishment time interval of the F1 machine set may be extended to 10s, and a delayed biting phenomenon may occur. Therefore, when the time interval between the two is larger than the preset threshold value, the F1 slip risk in the current production process can be judged; when the time interval between the two is smaller than or equal to the preset threshold value, the F1 slip risk is not existed in the current production process.
In this example, the HMD406 detection time point corresponding to different steel specifications is different from the time interval established by the F1 machine set steel biting signal, and an operator may set a corresponding preset threshold according to the actual steel specification, and when the steel strip slips, the time interval between the two is indefinite, may be close to the preset threshold, or may be much greater than the preset threshold, which all belong to the protection scope of the embodiment of the present application.
2) Judging from the load trend of F1: firstly, acquiring the rolling force data change condition fed back by a pressure sensor after an F1 unit bites a strip steel; judging whether the rolling force data change condition is consistent with the preset data change condition; and thirdly, if the change condition of the rolling force data is inconsistent with the preset data change condition, the situation shows that the F1 unit slip risk exists in the current production process.
For example, when the strip steel normally bites into the F1 machine set, the rolling force fed back by the pressure sensor of the F1 machine set can instantly build over 1000 tons of rolling force at about 0.06s of normal slope, as shown in fig. 3A; when the strip steel slips, the rolling force of the F1 unit is gradually reduced by more than 0.5s, and the rolling force of about 1000 tons is built up only after the strip steel is actually bitten after a small platform is formed by about 200 tons, as shown in figure 3B.
In this example, the rolling forces of the F1 units corresponding to different steel specifications are different, and the load changes when the F1 unit is normally bitten or slips occur are also different, so that an operator can select a corresponding normal load change diagram in the system according to the produced steel specifications, compare the load change diagram in the actual situation with the normal load change diagram, and detect whether the two diagrams are consistent, thereby judging whether the slip risk of the F1 unit exists in the current production process.
S300: and if the F1 unit has the risk of slipping, starting the steel conveying speed coefficient control block to adjust the numerical value of the steel conveying speed coefficient.
When the operator considers that there is a risk of slipping of the F1 machine set in the current production process, as shown in fig. 4, the numerical value of the "steel feeding speed coefficient" is adjusted in the coil box speed setting screen, and the coefficient is set to a numerical value that is greater than 1 and within the required range.
The adjustment range of the steel conveying speed coefficient is related to production lines, the adjustment ranges of the steel conveying speed coefficients corresponding to different production lines are different, for example, the steel conveying speed coefficient corresponding to a certain production line has a coefficient adjustment range [1, 1.05], an operator can correct the adjustment range of the steel conveying speed coefficient according to an actual operation production line, and then the actual value of the steel conveying speed coefficient is set according to actual conditions. When the speed coefficient is input to '1' in the speed control block in the control picture of the hot coil box, the control block of 'steel feeding speed coefficient' is not started; when the input value is greater than 1 and within the adjustment range, the "steel feeding speed coefficient" control block may be considered to be enabled.
S400: and the steel feeding speed adjusting block adjusts the steel feeding speed through the adjusted steel feeding speed coefficient.
After the numerical value of the steel conveying speed coefficient is adjusted by the steel conveying speed coefficient control block, the adjusted numerical value of the steel conveying speed coefficient is sent to a steel conveying speed adjusting block, and the steel conveying speed is changed by the steel conveying speed adjusting block in a mode of setting the rotating speed of a conveying pipeline by a system.
The change of the steel conveying speed of the intermediate billet is realized by the change of the rotating speeds of the backing roll below the intermediate billet and other conveying roller ways. In the automatic rolling mode, in the middle of the stripThe blank is uncoiled in a hot coiling box and then uncoiled at an uncoiling speed V0After the strip steel passes through an HMD406 hot spot, the strip steel speed is changed from an uncoiling speed to a steel feeding speed V ' along with the speed V of the finishing mill group F1, when an operator selects to start a ' steel feeding speed coefficient ' control block, the system takes a hot metal detector as a trigger signal, adjusts the rotating speed of corresponding backing rolls and a conveying roller bed through a ' steel feeding speed ' adjusting block, and adjusts the steel feeding speed V ' to be V ″ -aV ' (a-steel feeding speed coefficient), so that the steel feeding speed of the strip steel in a hot rolling box is properly increased.
An HMD (hot metal Detector) is used for identifying and judging whether hot metal reaches the HMD device installation position, "406" is a code number for distinguishing other HMDs, "4" refers to a hot box area, and "06" refers to a 6 th detection point of the hot box area. In this example, the HMD detection point is not limited to the 406 hot spot, and the HMD detection points corresponding to different production lines are different, and if there is a production line, the hot spot such as 405/408 is used as a trigger signal, which all belong to the protection scope of the embodiment of the present application.
S500: the speed difference is generated between the adjusted steel conveying speed and the speed of the F1 machine set, and the strip steel is forcibly pushed into the roller of the F1 machine set by external force generated by the speed difference.
For example, the numerical value of "steel feeding speed coefficient" is adjusted to 1.03, at this time, the speed of the intermediate slab unwound from the hot box is adjusted from the original steel feeding speed V 'to V ″ -1.03V', the steel feeding speed is increased by 3%, so that the steel feeding speed of the hot box and the speed of the finishing mill group match each other from the original relationship, a speed difference is generated by the increase of the steel feeding speed of the hot box by 3%, and the strip can be forcibly pushed into the rolls of the finishing mill group F1 by an external force generated by the speed difference, so that the strip is in the forced biting-in relationship of the micro-stack steel rolling.
The theory and technology of metal plasticity processing rolling indicates that the forced biting, that is, the rolled piece is forced to be pushed into the roller by external force, and the front end of the rolled piece is flattened by the external force, which is equivalent to reducing the contact angle alpha of the front end, so the biting condition can be improved. As shown in fig. 5 and 6, when the strip is forcibly pushed into the rolls of the finishing mill group F1 by an external force due to the speed difference, the tip of the strip is flattened by the external force, which corresponds to a reduction in the bite angle α (the bite angle is changed from α to α'). The strip steel biting condition is that the biting angle alpha is not more than the friction angle beta, the strip steel is forced to be pushed into an F1 roller of a finishing mill group through external force, the biting angle alpha is reduced, and the biting condition is improved.
When the operator believes there is currently no risk of slipping at F1, or the current production is not suitable for using the positive bite function, the coefficient may be revised to "1" in the "steel feed speed coefficient" control block as the "steel feed speed coefficient" block is not enabled.
According to the method for preventing the hot-rolled strip steel finishing mill group from slipping, the steel feeding speed of the hot-rolled strip steel is properly increased by adjusting the steel feeding speed coefficient, so that the speed difference between the steel feeding speed of the hot-rolled coil and the speed of the finishing mill group F1 is formed, the strip steel is forcibly pushed into the finishing mill group F1 roller by using external force formed by the speed difference, the gripping condition is improved, the slipping of the finishing mill group F1 strip steel is prevented, waste stacking and quality accidents of the strip steel caused by the slipping are reduced, and the production stability of the hot-rolled strip steel is improved.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (3)
1. A method of preventing slippage in a hot strip finishing block, the method comprising:
a steel feeding speed adjusting block and a steel feeding speed coefficient control block connected with the steel feeding speed adjusting block are arranged in the hot coil box control module;
judging whether the F1 unit slips risk or not in the current production process according to the signal establishment time when the F1 unit bites into the strip steel or according to the load trend after the F1 unit bites into the strip steel;
if the F1 unit slip risk exists, starting a steel conveying speed coefficient control block, and setting the steel conveying speed coefficient to a value which is larger than 1 and is within an adjustment range through the steel conveying speed coefficient control block; wherein, the adjustment range of the steel conveying speed coefficient comprises: 1 to 1.05;
the steel conveying speed adjusting block receives the adjusted numerical value of the steel conveying speed coefficient;
when the hot metal detector detects the intermediate billet, the hot metal detector sends a trigger signal to the steel feeding speed adjusting block;
the steel conveying speed adjusting block adjusts the rotating speed of a conveying roller way below the intermediate billet according to the steel conveying speed coefficient so as to adjust the steel conveying speed;
the adjusted steel conveying speed and the speed of the F1 machine set generate a speed difference, and the strip steel is forcibly pushed into the roll of the F1 machine set by external force generated by the speed difference;
if the F1 unit does not have the risk of slipping or is not suitable for using the forced biting function, the steel feeding speed coefficient control block revises the coefficient to 1.
2. The method of claim 1, wherein determining whether there is a risk of slip in the F1 unit during the current production run comprises:
recording the time interval between the detection time point of the hot metal detector and the steel biting signal establishment time of the F1 rolling mill;
judging whether the time interval exceeds a preset threshold value or not;
if the time interval exceeds a preset threshold value, the current production process is indicated to have the risk of slipping of the F1 unit.
3. The method of claim 1, wherein determining whether there is a risk of slip in the F1 unit during the current production run comprises:
acquiring the change condition of rolling force data fed back by a pressure sensor after the F1 machine set bites the strip steel;
judging whether the rolling force data change condition is consistent with a preset data change condition or not;
and if the change condition of the rolling force data is inconsistent with the preset data change condition, indicating that the F1 unit slip risk exists in the current production process.
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| CN112570466B (en) * | 2019-09-30 | 2023-01-20 | 宝山钢铁股份有限公司 | Control method for solving scratch of high-surface thin-specification strip steel conveying roller way |
| CN111069286B (en) * | 2019-12-05 | 2021-09-07 | 唐山不锈钢有限责任公司 | Automatic correction method for rolled piece slipping based on analysis and judgment of rolling process parameters |
| CN111790763A (en) * | 2020-06-16 | 2020-10-20 | 首钢京唐钢铁联合有限责任公司 | Strip steel hot rolling control method |
| CN113877968B (en) * | 2020-07-01 | 2023-12-12 | 宝山钢铁股份有限公司 | Method for preventing slipping of width-fixing machine |
| CN113333481B (en) * | 2021-05-31 | 2022-12-06 | 广东韶钢松山股份有限公司 | On-line detection method and device for hot metal detector state in continuous rolling production line |
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