CN113198850A - Control method and control system of hot rolling finishing mill group and industrial control equipment - Google Patents

Control method and control system of hot rolling finishing mill group and industrial control equipment Download PDF

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Publication number
CN113198850A
CN113198850A CN202110343545.2A CN202110343545A CN113198850A CN 113198850 A CN113198850 A CN 113198850A CN 202110343545 A CN202110343545 A CN 202110343545A CN 113198850 A CN113198850 A CN 113198850A
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frame
loop
compensation amount
bending force
value
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CN113198850B (en
Inventor
王海深
王娜
王秋娜
张转转
王伦
罗旭烨
焦彦龙
李春元
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Beijing Shougang Co Ltd
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Beijing Shougang Co Ltd
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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
    • B21B37/72—Rear end control; Front end control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention discloses a control method of a hot finishing mill group, which comprises the following steps: upon detection of Fi‑1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein, i takes values of 2,3, the. Upon detection of Fi‑1After unloading of the frame, F is increasediSetting tension of a loop of the frame; upon detection of FjAfter the frame is cast, locking FjRoll bending force of all frames behind the frame, and F is detectedk‑1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force; wherein, FjF removal in hot finishing mill group as frame1Frame and FNAny rack other than the rack; the locking value of the bending force of each frame is FjThe actual value of the bending force corresponding to the moment of casting the steel on the frame; k sequentially takes values of j +1, j +2, a. The method can improve the stability of the rolling of the tail part of the strip steel.

Description

Control method and control system of hot rolling finishing mill group and industrial control equipment
Technical Field
The application relates to the technical field of hot continuous rolling, in particular to a control method, a control system and industrial control equipment of a hot finishing mill group.
Background
When a hot finishing mill group rolls a plate strip, the stability of the tail part of the plate strip is important; for example, when strip steel is hot rolled, if the stability of the tail of the strip steel is not well controlled during rolling, the problems of deviation, wave and the like of the tail of the strip steel are easy to occur, and the tail flicking phenomenon can also occur in serious cases.
Disclosure of Invention
The invention provides a control method, a control system and industrial control equipment of a hot rolling finishing mill group, which aim to solve or partially solve the technical problem of poor control of the stability of a strip tail during finish rolling.
To solve the above technical problem, according to an alternative embodiment of the present invention, there is provided a control method of a finishing hot rolling mill train, including:
upon detection of Fi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein i takes values of 2,3, … in sequence, and N is the total frame number of the hot finishing mill group;
upon detection of Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
upon detection of FjAfter the frame is cast, locking the FjRoll bending force of all frames behind the frame, and F is detectedk-1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force; wherein, F isjThe frame is the hot finishing mill group for removing F1Frame and FNAny rack other than the rack; each one of which isThe roll force locking value of the frame is FjThe actual value of the bending force corresponding to the moment of casting the steel on the frame; k takes the values j +1, j +2, … …, N in turn.
Optionally, said detecting Fi-1After unloading of the frame, F is lowerediThe setting real-time rolling speed of the frame specifically comprises the following steps:
upon detection of said Fi-1After the frame is unloaded, according to the first compensation quantity, the F is processediCompensating for loop speed regulating quantity of the frame; the first compensation amount is-0.15% to-0.1%.
Further, the method for determining the first compensation amount comprises the following steps:
obtaining the FiSetting a tension value for a loop of the frame;
determining the first compensation amount according to the loop set tension value, which specifically comprises:
when the set tension value of the loop is less than or equal to 6MPa, the first compensation amount is-0.1%;
when the set tension value of the loop is more than 6MPa and less than or equal to 7MPa, the first compensation amount is-0.11 percent;
when the set tension value of the loop is greater than 7MPa and less than or equal to 8MPa, the first compensation amount is-0.12 percent;
when the set tension value of the loop is more than 8MPa and less than or equal to 9MPa, the first compensation amount is-0.13 percent;
when the set tension value of the loop is more than 9MPa and less than or equal to 10MPa, the first compensation amount is-0.14 percent;
when the set tension value of the loop is more than 10MPa, the first compensation amount is-0.15%.
Further, the control method further comprises:
upon detection of said FiAnd after the rack is unloaded, clearing the first compensation quantity.
Optionally, said detecting Fi-1After unloading of the frame, F is increasediThe loop of frame sets for tension, specifically includes:
obtaining the FiSetting a tension value for a loop of the frame;
upon detection of said Fi-1After the frame is unloaded, according to a second compensation amount, the F is adjustediAnd the loop set tension value of the rack is compensated, and the second compensation amount is 10-20% of the loop set tension value.
Further, the method for determining the second compensation amount comprises the following steps:
acquiring the type of a current rolled steel coil, wherein the type is one of mild steel, medium-hardness steel and hard steel;
determining the second compensation amount according to the type, specifically comprising:
if the current rolled steel coil belongs to the mild steel, the second compensation amount is 10% of the set tension value of the loop;
if the current rolled steel coil belongs to the medium-hardness steel, the second compensation amount is 15% of the set tension value of the loop;
and if the current rolled steel coil belongs to the hard steel, the second compensation amount is 20% of the set tension value of the loop.
Further, the control method further comprises:
upon detection of said FiAnd after the rack is unloaded, clearing the second compensation quantity.
Optionally, N is 7, and F isjThe frame is an F2 frame.
Based on the same inventive concept of the foregoing technical solution, according to yet another alternative embodiment of the present invention, there is provided a control system of a hot finishing mill train, including:
a rolling speed control module for controlling the rolling speed when F is detectedi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein i takes values of 2,3, … in sequence, and N is the total frame number of the hot finishing mill group;
a loop control module for detecting Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
a bending force control module for detecting FjAfter the frame is cast, locking the FjRoll bending force of all frames behind the frame, and F is detectedk-1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force; wherein, F isjThe frame is the hot finishing mill group for removing F1Frame and FNAny rack other than the rack; the locking value of the bending force of each frame is FjThe actual value of the bending force corresponding to the moment of casting the steel on the frame; k takes the values j +1, j +2, … …, N in turn.
Based on the same inventive concept of the foregoing technical solution, according to yet another alternative embodiment of the present invention, there is provided an industrial control device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the control method of the foregoing technical solution.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a control method of a hot finishing mill group, which reduces the set real-time rolling speed of a next frame (the frame) after unloading or steel throwing of the previous frame, so that the loop angle of the next frame returns to the set angle, and the influence on the rolling stability of a band tail due to loop picking is avoided; the centering capacity of the tail part of the strip steel can be improved and the rolling stability of the tail part of the strip steel can be improved by improving the loop set tension of the rack; then detecting a preset FjWhen the frame throws steel, the frame is located at FjThe roll bending force of all the frames behind the frame is locked as the roll bending force at the current moment; and in FjAll the racks behind the rack reduce the roll bending force of the next rack to 50% -70% of the locking value after the previous rack is unloaded, so that the convexity of the strip steel at the tail part can be increased, the wave trend at the tail part is reduced, and the centering property and the rolling stability of the tail part of the strip steel are improved; generally speaking, the stability of the strip tail rolling is improved from the three aspects, and the conditions of poor stability such as strip tail deviation, wave generation and tail flicking in the rolling process are avoided.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic flow diagram of a control method of a finishing hot rolling mill train according to an embodiment of the invention;
fig. 2 shows a schematic diagram of a control system of a finishing hot rolling mill train according to an embodiment of the invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
The research finds that the important reason influencing the stability of the hot-rolled strip tail is that when steel coils are finish rolled, after the unloading is completed in the rolling of the previous frame, due to the instant disappearance of the front tension of the strip, the loop of the next frame, namely the frame, can be instantly chosen (the loop angle is increased), the tension between the frames is reduced, and the phenomena of strip tail stability deterioration such as strip steel tail deviation, wave generation, tail throwing and the like are caused.
Based on the above reasons affecting the rolling with tail stability, as shown in fig. 1, the present invention provides a control method for a hot finishing mill group, the overall idea is as follows:
s1: upon detection of Fi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein i takes values of 2,3, … in sequence, and N is the total frame number of the hot finishing mill group;
s2: upon detection of Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
s3: after the Fj rack is detected to throw steel, the roll bending force of all racks behind the Fj rack is locked, and after the Fk-1 rack is detected to be unloaded, the roll bending force of the Fk rack is controlled to be 50% -70% of the roll bending force locking value; wherein the Fj stand is any one of the stands except for an F1 stand and an FN stand in the finishing hot rolling mill group; the roll bending force locking value of each frame is a roll bending force actual value corresponding to the steel throwing time of the Fj frame; k takes the values j +1, j +2, … …, N in turn.
In general, the control method reduces the set real-time rolling speed of the next rack (the rack) after the previous rack is unloaded or cast, so that the loop angle of the next rack returns to the set angle, and the influence on the tail rolling stability caused by loop picking is avoided; the centering capacity of the tail part of the strip steel can be improved and the rolling stability of the tail part of the strip steel can be improved by improving the loop set tension of the rack; then detecting a preset FjWhen the frame throws steel, the frame is located at FjThe roll bending force of all the frames behind the frame is locked as the roll bending force at the current moment; and in FjAfter the previous frame is unloaded, the roll bending force of the next frame is reduced to 50% -70% of the locking value, so that the convexity of the strip steel at the tail part can be increased, the wave trend at the tail part is reduced, and the centering property and the rolling stability of the tail part of the strip steel are improved; generally speaking, the stability of the strip tail rolling is improved from the three aspects, and the conditions of poor stability such as strip tail deviation, wave generation and tail flicking in the rolling process are avoided.
In an alternative embodiment, the above solution is described in detail by taking a 7-stand hot continuous rolling finishing train as an example, and those skilled in the art can reuse the solution in a 6-stand finishing train or a finishing train with other number of stands after learning the technical principle.
S1: upon detection of Fi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame;
specifically, unloading refers to the moment when the tail of the strip steel passes through the current stand and the moment when the rolling mill of the current stand loses load. Step S1 is to start to reduce the set real-time rolling speed of the next stand (or the own stand) after detecting the unloading of the previous stand; for example, after the strip steel is unloaded through an F1 stand and an F1 stand, the set real-time rolling speed of the F2 stand is reduced; when the F2 stand is unloaded, the set real-time rolling speed of the F3 stand begins to be reduced, and so on.
The reason why the set real-time rolling speed of the stand needs to be reduced after the previous stand is unloaded is that when the previous stand is unloaded or steel is thrown, the rolling force of the stand fluctuates due to the fact that the front tension disappears instantly, and therefore the rolling speed of the stand needs to be reduced for compensation, so that the situation that the loop of the stand is picked to influence the stability of rolling with the tail is avoided.
Reduction of FiThe method for setting the real-time rolling speed of the stand can be realized by operating a rolling mill control box on site by an operator and adjusting the speed regulating quantity of a loop between the stands by a control system. Specifically, the loop device is used for controlling the micro-tension between the two stands, and the loop controls the speed regulating amount of all main transmission controls, so that the rolling speed of all stands can be regulated. For a finishing train with 7 stands for continuous rolling, there are typically 6 loops, one between each two adjacent stands, for example the loop of the F3 stand, which refers to the loop disposed between the F3 stand and the F4 stand.
Therefore, the embodiment provides a rolling speed adjusting scheme based on a loop, which specifically comprises the following steps:
s11: upon detection of said Fi-1After the frame is unloaded, according to the first compensation quantity, the F is processediLoop speed adjustment of a machine frameCompensating the quantity; the first compensation amount is-0.15% to-0.1%.
The above scheme is obtained by tracking and testing mass production data. The production finds that the influence on the rolling force of the current stand when the current stand is unloaded is related to the tension of the loop of the current stand, the fluctuation range of the rolling force is between 1000KN and 3000KN, and the rolling speed obtained based on the calculation needs to be reduced by-0.15 percent to-0.1 percent to enable the angle of the loop to return to the set angle again, so the value range of the first compensation amount is between-0.15 percent and-0.1 percent; the first compensation amount is compensated by FiThe speed regulating quantity of the loop of the frame is superposed. The speed regulating quantity of the loop is a percentage value sent by the loop to the speed control of the rolling mill, and is used as the regulating quantity of the rolling speed based on the multiplication value of the speed regulating quantity and the set value of the rolling speed. For example, when the F2 stand is unloaded, when the speed adjustment of the loop of the F3 stand is 2%, and when the first compensation amount determined at this time is-0.1%, the speed adjustment of the loop actually sent to the rolling mill speed control is 1.9%.
The value range of the first compensation amount is determined to be-0.15% to-0.1%, because if the first compensation amount is too small, the purpose of reducing the picking sleeve can not be achieved; if the first compensation amount is too large, steel drawing is caused, and a reaction is generated.
Because the influence on the rolling force of the machine frame when the previous machine frame is unloaded is related to the tension, different compensation values can be selected according to the tension value, and a specific adjustment scheme obtained according to a large amount of data statistics is as follows:
s111: obtaining the FiSetting a tension value for a loop of the frame;
s112: determining the first compensation amount according to the loop set tension value, which specifically comprises:
when the set tension value of the loop is less than or equal to 6MPa, the first compensation amount is-0.1%;
when the set tension value of the loop is more than 6MPa and less than or equal to 7MPa, the first compensation amount is-0.11 percent;
when the set tension value of the loop is greater than 7MPa and less than or equal to 8MPa, the first compensation amount is-0.12 percent;
when the set tension value of the loop is more than 8MPa and less than or equal to 9MPa, the first compensation amount is-0.13 percent;
when the set tension value of the loop is more than 9MPa and less than or equal to 10MPa, the first compensation amount is-0.14 percent;
when the set tension value of the loop is more than 10MPa, the first compensation amount is-0.15%.
Optionally, when the tail part of the strip steel passes through FiAfter the rack (the rack), the control method further comprises the following steps:
s12: upon detection of said FiAnd after the rack is unloaded, clearing the first compensation quantity.
That is, after the machine frame is unloaded, the compensation of the loop speed regulating quantity of the machine frame is cancelled.
The scheme is to adjust the rolling speed, and then tension adjustment is carried out:
s2: upon detection of Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
the reason why the tension of the frame needs to be increased is that after the previous frame is unloaded, the tension between the frames is reduced due to the instant disappearance of the front tension, so that the strip steel is easy to deviate. And the tail centering capacity can be improved by increasing the tension of the frame, so that the rolling stability is improved. The same as the scheme of S1, the scheme of this step is: after the former frame is unloaded, the loop set tension of the latter frame (the frame) is reduced; for example, when the F1 rack is unloaded, the set tension of the loop of the F2 rack starts to be increased; when the F2 rack is unloaded, the set tension of the F3 rack begins to increase.
Specifically, the loop set tension adjustment scheme is as follows:
s21: obtaining the FiSetting a tension value for a loop of the frame;
s22: upon detection of said Fi-1After the frame is unloaded, according to a second compensation amount, the F is adjustediThe loop of the frame is set with a tension value for compensation, and the second compensation amount is 10% -20% of the set tension value of the loop％。
Specifically, the second compensation amount and the loop tension set value are compensated in a superposition mode, namely compensation for increasing the set tension of the loop of the rack by 10% -20%. The tension cannot be increased too much, otherwise, the strip steel is deformed, thinning and narrowing are caused, and the size precision of the finished hot rolled coil is influenced.
Furthermore, due to the fact that the deformation resistance of different strip steels is different, through a mass production test, a specific scheme for determining a second compensation quantity according to the type of the strip steel is provided:
s221: acquiring the type of a current rolled steel coil, wherein the type is one of mild steel, medium-hardness steel and hard steel;
s222: determining the second compensation amount according to the type, specifically comprising:
if the current rolled steel coil belongs to the mild steel, the second compensation amount is 10% of the set tension value of the loop;
if the current rolled steel coil belongs to the medium-hardness steel, the second compensation amount is 15% of the set tension value of the loop;
and if the current rolled steel coil belongs to the hard steel, the second compensation amount is 20% of the set tension value of the loop.
Mild steel, medium hardness steel and hard steel may be classified according to the yield strength or tensile strength range of the finished coil of hot rolled strip steel. The hot rolled finished product coil based yield strength classification strip steel types are divided as follows:
hard steel: the yield strength is more than or equal to 400 MPa;
medium hardness steel: the yield strength is more than 235MPa and less than 400 MPa;
mild steel: the yield strength is less than or equal to 235 MPa.
Optionally, the control method further includes:
s23: upon detection of said FiAnd after the rack is unloaded, clearing the second compensation quantity.
That is, after the local frame is unloaded, loop tension setting compensation to the local frame is cancelled.
The following is the control of the roll bending force of each frame:
s3: upon detection of FjAfter the frame is cast, locking the FjRoll bending force of all frames behind the frame, and F is detectedk-1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force.
For example, if FjThe frame is an F2 frame, the scheme is that after the F2 frame throws steel, the roll bending force of subsequent F3, F4, F5, F6 and F7 frames is locked, and the locked roll bending force refers to the actual roll bending force of the subsequent frame at the moment that the roll bending force is kept at the F2 throwing steel; if FjThe frame is an F3 frame, and the scheme is to lock the roll bending force of subsequent F4, F5, F6 and F7 frames after the F3 frame throws steel.
After locking the roll bending force of the subsequent frame, the following control logic is performed in the subsequent frame: after the front machine frame is unloaded, the roller bending force of the machine frame is reduced to 50% -70% of the locking value. With FjF2, the lock value is reduced to 70% for example: when the F2 frame is detected to throw steel, the roll bending force control values of F3-F7 are locked; when the F2 unloading is detected, the roll bending force control value of F3 is reduced to 70% of the F3 locking value; when F3 unloaded, the roll force control value of F4 dropped to 70% of the F4 lock value; when F4 unloaded, the roll force control value for F5 dropped to 70% of the original lock value for F5, and so on.
Optionally, the bending force of the present embodiment refers to a working roll bending force.
The roll bending force is locked and reduced because the convexity of the strip steel at the tail part can be increased, the wave tendency at the tail part is reduced, and the centering property and the rolling stability of the strip steel are improved. Tail instability generally occurs after the rolling mill is reduced from rolling speed to steel throwing speed, and for a common 7-stand continuous rolling finishing mill group, the position is generally the position of a F2 stand, and the tail middle wave of the strip steel mainly occurs in F3-F6 stands, so that the bending roll-reducing locking stand is preferentially selected from the F2 stand. However, for other types of 7-stand tandem rolling finishing mill groups or 6-stand tandem rolling finishing mill groups, it is also possible to set the position where the rolling speed is reduced to the throwing speed at F3 or F4, thereby locking the stand FjCan be used forAnd carrying out adaptability adjustment according to different finishing mill groups.
On the other hand, the reduction of the bending force to 50% -70% of the locking value is determined by comprehensively considering the relation of the bending force reduction on the rolling stability and the tail convexity control through a large number of tests and comparisons.
By adopting the scheme for trial, compared with before trial, the number of the drift of the hot rolled strip steel is reduced from the previous average 17 times or more per month to the average 5 times or less per month, and the number of the unplanned roll change caused by the drift is reduced from the previous average 10 times or more per month to the average 3 times or less.
Based on the same inventive concept of the foregoing embodiment, in yet another alternative embodiment, as shown in fig. 2, there is provided a control system of a hot finishing mill train, including:
a rolling speed control module 10 for controlling the rolling speed when F is detectedi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein i takes values of 2,3, … in sequence, and N is the total frame number of the hot finishing mill group;
a loop control module 20 for detecting Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
a bending force control module 30 for detecting FjAfter the frame is cast, locking the FjRoll bending force of all frames behind the frame, and F is detectedk-1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force; wherein, F isjThe frame is the hot finishing mill group for removing F1Frame and FNAny rack other than the rack; the locking value of the bending force of each frame is FjThe actual value of the bending force corresponding to the moment of casting the steel on the frame; k takes the values j +1, j +2, … …, N in turn.
Optionally, the rolling speed control module 10 is specifically configured to:
upon detection of said Fi-1After the frame is unloaded, according to the first compensation quantity, the F is processediCompensating for loop speed regulating quantity of the frame; the first compensation amount is-0.15% to-0.1%.
Further, the rolling speed control module 10 is specifically configured to:
obtaining the FiSetting a tension value for a loop of the frame;
determining the first compensation amount according to the loop set tension value, which specifically comprises:
when the set tension value of the loop is less than or equal to 6MPa, the first compensation amount is-0.1%;
when the set tension value of the loop is more than 6MPa and less than or equal to 7MPa, the first compensation amount is-0.11 percent;
when the set tension value of the loop is greater than 7MPa and less than or equal to 8MPa, the first compensation amount is-0.12 percent;
when the set tension value of the loop is more than 8MPa and less than or equal to 9MPa, the first compensation amount is-0.13 percent;
when the set tension value of the loop is more than 9MPa and less than or equal to 10MPa, the first compensation amount is-0.14 percent;
when the set tension value of the loop is more than 10MPa, the first compensation amount is-0.15%.
Further, the rolling speed control module 10 is further configured to:
upon detection of said FiAnd after the rack is unloaded, clearing the first compensation quantity.
Optionally, the loop control module 20 is specifically configured to:
obtaining the FiSetting a tension value for a loop of the frame;
upon detection of said Fi-1After the frame is unloaded, according to a second compensation amount, the F is adjustediAnd the loop set tension value of the rack is compensated, and the second compensation amount is 10-20% of the loop set tension value.
Further, the loop control module 20 is further configured to:
acquiring the type of a current rolled steel coil, wherein the type is one of mild steel, medium-hardness steel and hard steel;
determining the second compensation amount according to the type, specifically comprising:
if the current rolled steel coil belongs to the mild steel, the second compensation amount is 10% of the set tension value of the loop;
if the current rolled steel coil belongs to the medium-hardness steel, the second compensation amount is 15% of the set tension value of the loop;
and if the current rolled steel coil belongs to the hard steel, the second compensation amount is 20% of the set tension value of the loop.
Further, the loop control module 20 is further configured to:
upon detection of said FiAnd after the rack is unloaded, clearing the second compensation quantity.
Based on the same inventive concept of the foregoing embodiments, in yet another alternative embodiment, an industrial control device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the steps of the control method as in the foregoing embodiments.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a control method of a hot finishing mill group, which reduces the set real-time rolling speed of a next frame (the frame) after unloading or steel throwing of the previous frame, so that the loop angle of the next frame returns to the set angle, and the influence on the rolling stability of a band tail due to loop picking is avoided; the centering capacity of the tail part of the strip steel can be improved and the rolling stability of the tail part of the strip steel can be improved by improving the loop set tension of the rack; then detecting a preset FjWhen the frame throws steel, the frame is located at FjThe roll bending force of all the frames behind the frame is locked as the roll bending force at the current moment; and in FjAll the racks behind the rack reduce the roll bending force of the next rack to 50% -70% of the locking value after the previous rack is unloaded, so that the convexity of the strip steel at the tail part can be increased, the wave trend at the tail part is reduced, and the centering property and the rolling stability of the tail part of the strip steel are improved; in general, all three aspects are mentionedThe stability of high-tail rolling avoids the conditions of poor stability such as tail deviation, wave generation, tail flicking and the like in the rolling process.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A control method of a hot finishing mill train, characterized by comprising:
upon detection of Fi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein i takes values of 2,3, … in sequence, and N is the total frame number of the hot finishing mill group;
upon detection of Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
upon detection of FjAfter the frame is cast, locking the FjRoll bending force of all frames behind the frame, and F is detectedk-1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force; wherein, F isjThe frame is the hot finishing mill group for removing F1Frame and FNAny rack other than the rack; the locking value of the bending force of each frame is FjThe actual value of the bending force corresponding to the moment of casting the steel on the frame; k takes the values j +1, j +2, … …, N in turn.
2. The control method according to claim 1, wherein F is detectedi-1After unloading of the frame, F is lowerediThe setting real-time rolling speed of the frame specifically comprises the following steps:
upon detection of said Fi-1After the frame is unloaded, according to the first compensation quantity, the F is processediCompensating for loop speed regulating quantity of the frame; the first compensation amount is-0.15% to-0.1%.
3. The control method according to claim 2, wherein the first compensation amount is determined by:
obtaining the FiSetting a tension value for a loop of the frame;
determining the first compensation amount according to the loop set tension value, which specifically comprises:
when the set tension value of the loop is less than or equal to 6MPa, the first compensation amount is-0.1%;
when the set tension value of the loop is more than 6MPa and less than or equal to 7MPa, the first compensation amount is-0.11 percent;
when the set tension value of the loop is greater than 7MPa and less than or equal to 8MPa, the first compensation amount is-0.12 percent;
when the set tension value of the loop is more than 8MPa and less than or equal to 9MPa, the first compensation amount is-0.13 percent;
when the set tension value of the loop is more than 9MPa and less than or equal to 10MPa, the first compensation amount is-0.14 percent;
when the set tension value of the loop is more than 10MPa, the first compensation amount is-0.15%.
4. The control method according to claim 2, further comprising:
upon detection of said FiAnd after the rack is unloaded, clearing the first compensation quantity.
5. The control method according to claim 1, wherein F is detectedi-1After unloading of the frame, F is increasediThe loop of frame sets for tension, specifically includes:
obtaining the FiSetting a tension value for a loop of the frame;
upon detection of said Fi-1After the frame is unloaded, according to a second compensation amount, the F is adjustediAnd the loop set tension value of the rack is compensated, and the second compensation amount is 10-20% of the loop set tension value.
6. The control method according to claim 5, wherein the second compensation amount is determined by:
acquiring the type of a current rolled steel coil, wherein the type is one of mild steel, medium-hardness steel and hard steel;
determining the second compensation amount according to the type, specifically comprising:
if the current rolled steel coil belongs to the mild steel, the second compensation amount is 10% of the set tension value of the loop;
if the current rolled steel coil belongs to the medium-hardness steel, the second compensation amount is 15% of the set tension value of the loop;
and if the current rolled steel coil belongs to the hard steel, the second compensation amount is 20% of the set tension value of the loop.
7. The control method according to claim 5, further comprising:
upon detection of said FiAnd after the rack is unloaded, clearing the second compensation quantity.
8. The control method according to claim 1, wherein N is 7, and F is 7jThe frame is an F2 frame.
9. A control system for a finishing hot rolling mill train, the control system comprising:
a rolling speed control module for controlling the rolling speed when F is detectedi-1After unloading of the frame, F is lowerediSetting real-time rolling speed of the frame; wherein i takes values of 2,3, … in sequence, and N is the total number of the hot finishing mill groupThe number of racks;
a loop control module for detecting Fi-1After unloading of the frame, F is increasediSetting tension of a loop of the frame;
a bending force control module for detecting FjAfter the frame is cast, locking the FjRoll bending force of all frames behind the frame, and F is detectedk-1After unloading of the frame, control FkThe roll bending force of the frame is 50% -70% of the locking value of the roll bending force; wherein, F isjThe frame is the hot finishing mill group for removing F1Frame and FNAny rack other than the rack; the locking value of the bending force of each frame is FjThe actual value of the bending force corresponding to the moment of casting the steel on the frame; k takes the values j +1, j +2, … …, N in turn.
10. An industrial control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program is adapted to carry out the steps of the control method according to any one of claims 1 to 8.
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CN110355216A (en) * 2019-06-26 2019-10-22 武汉钢铁有限公司 Eliminate the control method of short route Thin Strip Steel tail portion lateral vibration line offset

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100218576A1 (en) * 2007-10-12 2010-09-02 Hans-Joachim Felkl Operating method for introducing a product to be rolled into a roll stand of a roll mill, control device, data carrier, and roll mill for rolling a strip-type product to be rolled
CN102989787A (en) * 2012-12-21 2013-03-27 鞍钢股份有限公司 Method for controlling head and tail shapes of hot-rolled strip steel
CN106345819A (en) * 2015-07-16 2017-01-25 宝山钢铁股份有限公司 Controlling method of hot continuous rolled and finish rolled strip steel tail rolling stability
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