CN113500114B - Method for eliminating transverse strip-shaped roll mark defect of online temper mill - Google Patents
Method for eliminating transverse strip-shaped roll mark defect of online temper mill Download PDFInfo
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- CN113500114B CN113500114B CN202110675306.7A CN202110675306A CN113500114B CN 113500114 B CN113500114 B CN 113500114B CN 202110675306 A CN202110675306 A CN 202110675306A CN 113500114 B CN113500114 B CN 113500114B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/05—Stretching combined with rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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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
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Abstract
The invention provides a method for eliminating the cross-strip roll mark defect of an online temper mill, which comprises the following steps of S1, controlling the tension balance of strip steel when a welding seam passes through an inlet and an outlet of the online temper mill; s2, when the strip steel enters the online temper mill, adjusting the tension parameter of the welding line passing through the online temper mill according to the thickness of the strip steel; s3, when the welding seam passes through the online temper mill, controlling the roll opening mode of the online temper mill to be that the upper roll is fixed and the lower roll descends; s4, when the control system controls all parts of the online temper mill to reach operation limit, operation conditions are achieved, and an operation instruction is triggered; and starting the on-line temper mill to operate. The method for eliminating the cross-strip-shaped roll mark defect of the online temper mill, disclosed by the invention, has the advantages that the generation of the cross-strip-shaped roll mark defect of the online temper mill is fundamentally and effectively controlled by the schemes of reducing the tension parameter of the welding line passing through the online temper mill, changing the roll opening mode of the welding line passing through the online temper mill, realizing the tension balance of an inlet and an outlet of the welding line passing through the online temper mill and the like.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for eliminating the defect of a cross-strip-shaped roll mark of an online temper mill.
Background
The stainless steel product is widely applied to industries such as building decoration, rail transit, catering kitchenware, deep drawing products, electronic components and the like due to good physical properties, weldability and corrosion resistance, and has the characteristics of attractiveness and durability. In the modern society, with the increasing demand of people for good living, the consumption of stainless steel by Chinese people is steadily increased, and meanwhile, the demand on the quality of stainless steel products is gradually improved, so that the stainless steel products are promoted to develop towards high standard and high quality.
The technological process of the cold-rolled stainless steel 2B surface product comprises the steps of rolling and producing a NO.1 plate by a twenty-high rolling mill, annealing and pickling, quenching and tempering by an online temper mill, flowing to a finished product machine set, longitudinally shearing, slitting and warehousing. At the present stage, the cross bar roll mark defect of the online temper mill always restricts the improvement of the product quality and seriously influences the completion of the qualified rate index.
For such defects, the detailed description is: the cold rolling annealing pickling line is a continuous production line, the tail part of one coil of steel is connected with the head part of the other coil of steel through a rolling type welding machine between the coils of steel, and the cold rolling annealing pickling line continuously operates in the production line. When the welding seam passes through the online temper mill, the strip steel can be stopped quickly from a high-speed (150 m/min) running state, and the temper roll also stops running along with the strip steel. And after the leveler is stopped, the online leveling roller is opened, the welding line runs through the leveling roller, then the leveling roller is closed, and then the operation is started. Because the strip steel has stress after being stopped at a high speed, the instantaneous stress of the lifting roller of the temper mill is released, the strip steel and the temper roller have relative dislocation, so that the transverse strip dislocation damage along the width direction of the roll surface of the temper roller occurs, and if the strip steel is not processed, the periodic transverse strip temper roller mark defect occurs on the surface of the strip steel. This defect can occur in the leveling roller action that opens and shuts at every turn, if solve through changing the leveling roller, can consume a large amount of manpower and materials and production efficiency. If the surface of the grinding roller is eliminated by the flat roller polisher, the defect of dozens of meters to hundreds of meters can be generated, and according to the quality inspection judgment standard, only the secondary product degradation treatment can be judged, so that the quality of the strip steel material object is influenced, and the serious quality economic loss can be caused.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for eliminating the cross-strip roll mark defect of an online leveler, so as to solve the problem of serious economic quality loss caused by the prominent cross-strip roll mark defect of the online leveler.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for eliminating the cross-strip roll mark defect of an online temper mill comprises the steps that equipment used by the method comprises the online temper mill, and the online temper mill is connected with an external control system through signals; the method comprises the following steps:
s1, when a welding line passes through an inlet and an outlet of an online temper mill, a control system controls the tension balance of strip steel;
s2, when the strip steel enters the online temper mill, the control system adjusts the tension parameter of the welding line passing through the online temper mill according to the thickness of the strip steel;
s3, when a welding line passes through the online temper mill, the control system controls the roll opening mode of the online temper mill to be that the upper roll is fixed and the lower roll descends;
s4, when the control system controls all parts of the online temper mill to reach operation limit, operation conditions are achieved, and an operation instruction is triggered; and starting the on-line temper mill to operate.
Further, the specific method of step S1 is as follows:
s11, connecting a signal of welding line detection equipment of the production unit to an external control system, and when a welding line reaches a set distance in front of a temper mill, enabling the control system to enter a welding line positioning link to prepare for reducing the running speed of the strip steel;
s12, the control system accurately positions the welding seam in front of the online temper mill, the tension roller operates through closing action of the mechanical band-type brake, the strip steel operation is stopped, and the upper and lower temper rolls also stop operating through identification of the electrical signals.
And S13, the upper leveling roller and the lower leveling roller do not perform opening action and are in a closed state.
Further, in step S11, the specific requirement of the set distance before the weld reaches the leveler is: the running speed and the distance of the strip steel can be changed at any time, and the strip steel can be automatically stopped when the welding line at the joint of the steel coil reaches the position 2 meters in front of the online temper mill.
Further, the specific method of step S2 is as follows:
s21, inputting the thickness value of the online strip steel and the tension ratio matched with the thickness value into a control system in advance, controlling the balance of the inlet and outlet tension values of the temper mill to be the same value by the control system after the control system judges that the strip steel is in place and stops, and executing normal over-welding seam determined action instructions by other devices of the online temper mill;
and S22, the control system reversely runs the tension roller through the tension control system to eliminate the tension building state of the strip steel, so that the strip steel is in a gravity free sagging state.
Further, in the step S21, when the thickness of the strip steel ranges from 0.20m to 0.80m, the tension adjustment ratio of the temper mill is not greater than 15% compared with that of the strip steel in a normal state;
when the thickness range of the strip steel is 0.81m-1.30m, the tension adjustment proportion of the temper mill is not more than 45% compared with that of the strip steel in a normal state;
when the thickness of the strip steel ranges from 1.31m to 3.00m, the tension adjustment proportion of the temper mill is not more than 60 percent compared with that of the strip steel in a normal state.
Further, the specific method of step S3 is as follows:
s31, after the step S22 is executed, namely after the set time is reached, the control system controls the action instruction of opening the upper leveling roller and the lower leveling roller, so that the upper leveling roller is kept still, and the lower leveling roller is slowly lowered to the roller opening position through the control of a hydraulic cylinder;
s32, when the upper leveling roller and the lower leveling roller are completely opened, the control system positively operates the tension roller through the tension control system to enable the strip steel to be in a tension building state;
s33, selecting whether the next steel coil is put into use of the online temper mill or not according to the production of an operator, and if the next steel coil is not put into use, directly executing an operation starting command, directly operating the strip steel for production, and enabling the temper rolls to be in an open state; if the commissioning condition is triggered, the welding seam is subjected to secondary positioning instruction operation, and the welding seam is moved from an inlet fixing position to an outlet fixing position and is stopped;
s34, when the welding seam is positioned to the outlet and stops, after the control system gives an instruction of throwing the leveling roller, the lower leveling roller slowly rises to a working position through the hydraulic cylinder control system, forms a closed state with the upper working roller, and clamps the strip steel; and the polisher and the crease-resistant roller of the online planisher are all put into service and run to a working position.
Compared with the prior art, the method for eliminating the transverse strip-shaped roll mark defect of the online planisher has the following advantages:
(1) The method for eliminating the defects of the cross-strip-shaped roll marks of the online temper mill focuses on researching and analyzing the principle of the generation of the cross-strip-shaped temper roll marks, and combines the field operation experience, and the method radically and effectively controls the generation of the defects of the cross-strip-shaped temper roll marks of the online temper mill by practical application of schemes such as reducing the tension parameters of a welding line passing through the online temper mill, changing the roll opening mode of the welding line passing through the online temper mill, realizing the tension balance of an inlet and an outlet of the welding line passing through the online temper mill, and the like.
(2) According to the method for eliminating the cross bar roll mark defect of the online temper mill, the quality defect is solved by adopting the method in 2020, the cross bar roll mark of the online temper mill is degraded by 150 tons in the whole year, 450 tons are reduced compared with 2019, the economic quality loss is reduced by 45 ten thousand yuan according to the difference price of a qualified product and a secondary product of 1000 yuan/ton, and the quality increase is realized; meanwhile, the steel coil utilization rate of the online leveling unit is increased from 92.5% to 97.3%, the abnormal flow direction of the process is reduced, the process cost and the yield loss are reduced by 148 ten thousand yuan all the year round, the enterprise benefit is greatly improved, and the resource loss is reduced.
(3) The method for eliminating the strip-shaped roll mark defect of the online temper mill can realize setting different tension ratios according to the thickness change of the strip steel, thereby eliminating the tightening state of the strip steel, further reducing the stress release between the temper roll and the strip steel, and effectively avoiding the working roll from being scratched by the strip steel in the shaking way when the temper roll is opened.
(4) According to the method for eliminating the transverse strip-shaped roll mark defect of the online temper mill, when a welding line passes through the online temper mill, only the lower temper roll is lowered, the upper temper roll is fixed in position, and the action frequency of the spiral positioning device and the upper roll balancing device is lowered from the previous maximum 200 times/shift to the current 1 time/shift; the abrasion caused by frequent action of a spiral positioning device and frequent action of a spiral pressing copper head is avoided, the precision and the stability of a rolling line are improved, the dislocation between the strip steel and the leveling roller is reduced, and the generation of the cross bar leveling roller mark defect is effectively prevented.
(5) The method for eliminating the strip-shaped roll mark defect of the online temper mill thoroughly eliminates the problem of stress release caused by asynchronous speed when the temper roll and the strip steel run from high speed to a stop state by adjusting the tension balance of the inlet and the outlet when a welding seam passes through the online temper mill.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart of a method for eliminating the cross-strip roll mark defect of an on-line temper mill according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A method for eliminating the cross-strip roll mark defect of an online planisher is disclosed, as shown in figure 1, the equipment used in the method comprises an online planisher and a rolling line adjusting device, the existing online planisher equipment is established in a cold rolling annealing pickling line process, a group of tension control systems are respectively arranged in front of and behind the online planisher, each group of tension control systems comprises 4 single tension rollers and is used for providing speed and tension control; the online temper mill is provided with a dual-drive two-roller design and is divided into an upper temper roller and a lower temper roller; the upper leveling roller and the lower leveling roller are both provided with polishers for removing magazines and oil stains on the surface of the leveling roller; inside the housing bay of the online temper mill, two sides of the upper temper roll and the inlet and outlet of the lower temper roll are respectively provided with an anti-crease roll device which is used for ensuring that the strip steel keeps stable and does not shake when entering and exiting the temper rolls and has the function of adjusting the strip steel plate type; the online temper mill is also provided with a roll bending system for compensating the roller shape deficiency of the upper and lower temper rolls so as to achieve the purpose of adjusting the strip steel plate shape;
the pass line adjustment device is controlled by a gear motor of the ac decelerator and a screw-down worm gear unit for lowering the upper leveler roll onto the pass line. In order to detect the vertical displacement of the lower leveling roll, a linear position sensor is installed at a driving side of a gear unit in the in-line leveler. The moving distance of the lower leveling roll is transmitted to the linear position sensor through the gear unit, and the rolling line adjusting device automatically operates after the start button is pressed. The upper and lower end positions of the rolling line adjusting device are controlled by limit switches.
The online temper mill is connected with an external control system through signals; preferably, the external control system is a hydraulic station.
The working principle of the online temper mill equipment is as follows:
when the on-line temper mill works, the strip steel passes through the on-line temper mill from left to right. The upper temper rolls are lowered to the pass line holding position and the lower temper rolls are raised upwardly until they contact the strip and provide the rolling force. The band steel passes through between the upper leveling roller and the lower leveling roller, and the anti-wrinkle roller upwards jacks the band steel to keep the band steel stable and not to shake. In the operation process, all rollers of the on-line temper mill system keep high-speed synchronous motion along with the strip steel, and reach the flat plate type and the bright stainless steel 2B surface according to set process parameters, and simultaneously, the yield platform of the strip steel can be eliminated to improve the mechanical property.
The method comprises the following steps:
s1, realizing the tension balance of an inlet and an outlet when a welding line passes through an online temper mill;
the key of roll-lifting mark is to thoroughly eliminate the problem of stress release caused by asynchronous speed when the leveling roll and the strip steel run from high speed to a stop state.
In the field test process for solving the defects, after the operation of the temper mill is tried to be stopped, the manual mode control is switched, when a welding seam is stopped at the inlet of the temper mill, the tension of the strip steel is manually reduced, the strip steel at the outlet side of the temper mill is manually reversed towards the inlet side by utilizing tension roller equipment, the tension is completely eliminated, and then the operation of opening the temper roll is carried out. When the scheme is used for operation, the dislocation between the strip steel and the leveling roll can not be generated, so the defect of horizontal strip leveling roll mark can not occur. But the method has no practical application significance to a cold rolling annealing pickling line for continuous production. The effective loop quantity of 600 meters at the outlet of the cold rolling annealing pickling line, the running speed of 150 meters/minute and the time for passing a welding line, unloading coils and loading coils is only 4 minutes. Each step of passing the weld is therefore made with minimal time and without stopping and then reversing the run. And therefore can only be implemented by means of a solution for evening out the entrance tension (i.e. by means of electrical control).
The electrical control process is as follows:
s11, through welding seam detection equipment of a production unit, the welding seam detection equipment is connected to an external hydraulic station through signals (through calculation control of distance and speed, namely a speed formula S = vt), when a welding seam reaches a set distance in front of a temper mill, a welding seam positioning link is carried out, and the running speed of the strip steel is prepared to be reduced;
in one or more embodiments, the strip enters the weld locating step when the weld reaches 10 meters before the on-line leveler. Preferably, the distance is not less than 8 meters. The distance can be changed at any time according to the running speed and the distance of the strip steel, and the strip steel can be automatically stopped as long as the requirement that the welding seam at the joint of the steel coil reaches the position 2 meters in front of the online temper mill is met.
And S12, accurately positioning the welding line in front of the temper mill through speed control, simultaneously stopping the operation of the strip steel through the closing action of the mechanical band-type brake during the operation of the tension roller, and simultaneously stopping the operation of the upper and lower temper rolls through the identification of an electric signal.
And S13, the upper leveling roller and the lower leveling roller do not perform opening action and are in a closed state.
Specifically, the tension roller belongs to a tension control system, and the tension control system is connected to the hydraulic station through signals, so that when the tension roller is closed through a mechanical band-type brake (namely, when the strip steel stops moving), the hydraulic station can control the upper leveling roller and the lower leveling roller to stop running through the leveling machine. By implementing the scheme, the stress of the leveling roller relative to the strip steel is effectively released, so that the effect of reverse running of the strip steel is achieved, and the purpose of fundamentally solving the transverse strip-shaped roll mark defect of the online leveling machine is finally realized.
S2, reducing tension parameters of the welding line passing through the online temper mill;
when the welding seam at the joint of the steel coil reaches the position 2 meters in front of the online temper mill, the strip steel is automatically stopped, and the temper mill stops running along with the strip steel. Specifically, according to the conventional control, after the online leveler is stopped, the upper leveling roll is lifted, the lower leveling roll is lowered, and the strip steel is in a tight state under the tension of the tension roll in the process. And when the upper leveling roller and the lower leveling roller are opened to the set positions, the tension roller drives the strip steel to run to pull the welding line to the outlet of the leveling machine for 2 meters and stop, then the upper leveling roller and the lower leveling roller are closed, and normal operation production is continued. According to the steps, at the moment of opening the roll, the tight strip steel can rub the leveling roll to generate the transverse strip roll mark defect.
The detailed description of the solution is that when the welding seam is positioned before the on-line temper mill and stops running, two groups of tension control systems at the front and the back of the on-line temper mill can maintain the tension of the strip steel at 90% of the process tension value in normal running, and if the temper roll is opened at the moment, the strip steel can shake and scratch the working roll instantly. According to the scheme, different tension ratios are given according to the thickness change of the strip steel, so that the tightening state of the strip steel is eliminated, and the stress release between the leveling roller and the strip steel is reduced. The tension before the roll opening is optimized, the tension is reduced as much as possible, and different roll opening tensions of the online temper mill are set according to different strip steel thicknesses. The process parameter values obtained by long-term field groping and production experiments are shown in the following table:
s21, inputting the thickness value of the online strip steel and the tension ratio matched with the thickness value into a control system in advance, and controlling the balance of the inlet and outlet tension values of the temper mill to be the same value by the control system after the control system judges that the strip steel is in place and stops, thereby realizing the effect of manually turning the strip steel back. Meanwhile, other devices of the online temper mill execute normal over-welding seam preset action instructions, the polisher returns to an off-line position from a working position, and the anti-wrinkle roller is lowered to the lowest position. According to the thickness value of the on-line strip steel, different tension ratios are given, so that the tension state of the strip steel is eliminated.
And S22, the control system reversely runs the tension roller through the tension control system to eliminate the tension building state of the strip steel, so that the strip steel is in a gravity free sagging state.
And S3, changing a roll opening mode when the welding line passes through the online temper mill.
S31, after the step S22 is executed, namely after the set time is reached, the control system controls the action instruction of opening the upper leveling roller and the lower leveling roller, so that the upper leveling roller is kept still, and the lower leveling roller is slowly lowered to the roller opening position through the control of a hydraulic cylinder;
s32, when the upper leveling roller and the lower leveling roller are completely opened, the control system positively operates the tension roller through the tension control system to enable the strip steel to be in a tension building state;
s33, selecting whether the next steel coil is put into use of the online temper mill or not according to the production of an operator, and if the next steel coil is not put into use, directly executing an operation starting command, directly operating the strip steel for production, and enabling the temper rolls to be in an open state; if the commissioning condition is triggered, the welding seam is subjected to secondary positioning instruction operation and is stopped from an inlet fixing position to an outlet fixing position.
S34, when the welding seam is positioned to an outlet and stops (the action can be delayed and controlled by a control system or can be realized by installing an infrared sensor at the outlet and sending a signal to the control system after the infrared sensor senses the action), after the control system gives an instruction for throwing the leveling roller, the lower leveling roller slowly rises to a working position through a hydraulic cylinder control system, forms a closed state with the upper working roller and clamps the strip steel; and the polisher and the crease-resistant roller of the online temper mill are all put into service and run to a working position.
S35, when all parts of the temper mill reach operation limit, achieving operation conditions and triggering operation instructions; the online temper mill is started to operate, and the effect of improving the plate shape of the strip steel is achieved.
Specifically, the roll opening mode designed by the traditional online temper mill is that an upper temper roll rises and a lower temper roll falls simultaneously, so that the action of opening the temper roll is realized. From a mechanical point of view, the raising of the upper levelling roll is performed by three sets of devices, respectively a balancing hydraulic cylinder, a bending cylinder and a screw positioning device. The unit is a 40-ten-thousand-ton cold rolling annealing pickling line, the number of produced coils per day can reach 100 coils at most, namely the three sets of devices act 200 times per day, severe loss is generated on the devices, and the precision of an adjusting system is influenced. The abrasion of the spiral positioning device causes the reduction of the positioning precision of the leveling roller, thereby increasing the probability of generating roll mark lifting.
The technical scheme of the invention creatively changes the roller opening mode from the original simultaneous opening of the upper roller and the lower roller into the mode of keeping the upper roller still and lowering the lower roller, and the detailed description is as follows: the original mode of opening the roller is that the welding seam location is to the temper mill before the shutdown back, goes up the temper roll and passes through pneumatic cylinder, spiral turbine worm device, promotes to the position of opening completely by the rolling line position, and lower temper roll passes through the pneumatic cylinder effect, is reduced to the position of opening completely by operating position. The existing roller opening mode is repeatedly researched and tested on site, and when a welding seam is required to be executed to pass through the action of the online leveling machine through electrical control, an instruction for opening the upper leveling roller is shielded, and the action is finished by default. The lower leveling roller is directly lowered, so that the essential change of the roller opening mode is realized. The method revolutionarily reduces the operation frequency of the spiral positioning device and the upper roll balancing device from the previous maximum 200 times/shift to the current 1 time/shift. The abrasion caused by frequent actions of the spiral positioning device and the spiral pressing copper head is avoided, and meanwhile, the precision and the stability of the rolling line are improved. When the scheme is applied to production, when a welding seam passes through the online leveling machine, only the lower leveling roller is lowered, the upper leveling roller ensures that the position is not moved, the stability of equipment is kept, the dislocation between the strip steel and the leveling roller is reduced, and the generation of the cross bar leveling roller mark defect is effectively prevented.
The method focuses on researching and analyzing the principle of the generation of the horizontal strip-shaped leveling roll mark, combines the field operation experience, and is applied to the implementation of schemes such as reducing the tension parameter of the welding line passing through the online leveling machine, changing the roll opening mode of the welding line passing through the online leveling machine, realizing the balance of the inlet and outlet tension of the welding line passing through the online leveling machine, and the like, so that the generation of the horizontal strip-shaped leveling roll mark defect of the online leveling machine is fundamentally and effectively controlled.
The defect solving method of the application is already carried out in a factory for ripening and stabilizing, and achieves substantial effect. The method is adopted to solve the quality defect in 2020, the roll mark of the cross strip of the online temper mill is reduced by 150 tons in the whole year, 450 tons is reduced compared with 2019, and the economic quality loss is reduced by 45 ten thousand yuan according to the difference price of a qualified product and a secondary product of 1000 yuan/ton, so that the quality improvement is realized. Meanwhile, the steel coil casting rate of the online leveling unit is increased from 92.5% to 97.3%, the abnormal flow direction of the process is reduced, and the process cost and the yield loss are reduced by 148 ten thousand yuan all the year round.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A method for eliminating the defect of the cross-strip roll mark of an on-line temper mill is characterized by comprising the following steps: the equipment used by the method comprises an online temper mill, wherein the online temper mill is connected with an external control system through signals;
the method comprises the following steps:
s1, when a welding line passes through an inlet and an outlet of an online temper mill, a control system controls the tension balance of strip steel;
s2, when the strip steel enters the online temper mill, the control system adjusts the tension parameter of the welding line passing through the online temper mill according to the thickness of the strip steel; the specific method comprises the following steps:
s21, inputting the thickness value of the online strip steel and the tension ratio matched with the thickness value into a control system in advance, controlling the balance of the inlet and outlet tension values of the temper mill to be the same value by the control system after the control system judges that the strip steel is in place and stops, and executing normal over-welding seam determined action instructions by other devices of the online temper mill;
s22, the control system reversely runs the tension roller through the tension control system to eliminate the tension building state of the strip steel and enable the strip steel to be in a gravity free sagging state;
s3, when the welding seam passes through the online temper mill, the control system controls the roll opening mode of the online temper mill to be that the upper roll is fixed and the lower roll descends;
s4, when the control system controls all parts of the online temper mill to reach operation limit, operation conditions are achieved, and an operation instruction is triggered; and starting the on-line temper mill to operate.
2. The method for eliminating the cross-strip roll mark defect of the online planisher according to claim 1, characterized in that: the specific method of the step S1 is as follows:
s11, connecting a signal of welding line detection equipment of the production unit to an external control system, and when a welding line reaches a set distance in front of a temper mill, enabling the control system to enter a welding line positioning link to prepare for reducing the running speed of the strip steel;
s12, accurately positioning the welding line in front of the online temper mill by a control system, stopping the operation of the strip steel by closing the tension roller through a mechanical band-type brake during the operation of the tension roller, and stopping the operation of the upper and lower temper rolls through the identification of an electric signal;
and S13, the upper leveling roller and the lower leveling roller do not perform opening action and are in a closed state.
3. The method for eliminating the cross-strip roll mark defect of the online planisher as recited in claim 2, characterized in that: in step S11, the specific requirement of the set distance before the weld reaches the leveler is: the running speed and the distance of the strip steel can be changed at any time, and the strip steel can be automatically stopped when the welding line at the joint of the steel coil reaches the position 2 meters in front of the online temper mill.
4. The method for eliminating the cross-strip roll mark defect of the online planisher according to claim 1, characterized in that: in the step S21, when the thickness range of the strip steel is 0.20mm-0.80mm, the tension adjustment proportion of the strip steel is not more than 15% compared with that of the strip steel in a normal state;
when the thickness range of the strip steel is 0.81mm-1.30mm, the tension adjustment proportion of the temper mill is not more than 45% compared with that of the temper mill in a normal state;
when the thickness of the strip steel ranges from 1.31mm to 3.00mm, the tension adjustment proportion of the temper mill is not more than 60% compared with that of the strip steel in a normal state.
5. The method for eliminating the cross-strip roll mark defect of the online planisher according to claim 1, characterized in that: the specific method of the step S3 is as follows:
s31, after the step S22 is executed, namely after the set time is reached, the control system controls the action instruction of opening the upper leveling roller and the lower leveling roller, so that the upper leveling roller is kept still, and the lower leveling roller is slowly lowered to the roller opening position through the control of a hydraulic cylinder;
s32, when the upper leveling roller and the lower leveling roller are completely opened, the control system positively operates the tension roller through the tension control system to enable the strip steel to be in a tension building state;
s33, selecting whether the next steel coil is put into use of the online temper mill or not according to the production of an operator, and directly executing an operation starting command if the next steel coil is not put into use and triggered, wherein the strip steel directly runs for operation production, and the temper rolls are in an open state; if the commissioning condition is triggered, the welding seam is subjected to secondary positioning instruction operation, and the welding seam is moved from an inlet fixing position to an outlet fixing position and is stopped;
s34, when the welding seam is positioned to the outlet and stops, after the control system gives an instruction of throwing the leveling roller, the lower leveling roller slowly rises to a working position through the hydraulic cylinder control system, forms a closed state with the upper working roller, and clamps the strip steel; and the polisher and the crease-resistant roller of the online planisher are all put into service and run to a working position.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168172A (en) * | 2006-10-23 | 2008-04-30 | 宝山钢铁股份有限公司 | Tension control system and method for planetary gear structure tension roller type evener |
| CN102500659A (en) * | 2011-11-24 | 2012-06-20 | 宝钢工程技术集团有限公司 | Inlet anti-crease rollers in stainless steel flattening unit |
| CN102626718A (en) * | 2012-04-13 | 2012-08-08 | 中冶南方工程技术有限公司 | Control method for high-strength steel straightening and leveling unit |
| CN103433297A (en) * | 2013-08-22 | 2013-12-11 | 攀钢集团攀枝花钢钒有限公司 | Tension stable control device for skin pass mill |
| CN204583915U (en) * | 2015-04-28 | 2015-08-26 | 中冶赛迪工程技术股份有限公司 | Hot-strip skin pass mill |
| CN105642677A (en) * | 2016-03-25 | 2016-06-08 | 首钢总公司 | Method and device for removing roll marks on surface of band steel |
| CN108273870A (en) * | 2018-03-19 | 2018-07-13 | 无锡市锡东橡塑机械有限公司 | A kind of belt steel flating machine |
| CN110038907A (en) * | 2019-04-19 | 2019-07-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method controlling planisher and the electrohydraulic servo system for controlling planisher |
| CN110227723A (en) * | 2019-06-09 | 2019-09-13 | 宝钢湛江钢铁有限公司 | A kind of parameter control method of six roller Cold-Rolled Strip Temper Mill initial segment of continuous annealing |
| CN111299324A (en) * | 2019-12-03 | 2020-06-19 | 攀钢集团西昌钢钒有限公司 | Hot-rolled strip steel leveling method |
-
2021
- 2021-06-17 CN CN202110675306.7A patent/CN113500114B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168172A (en) * | 2006-10-23 | 2008-04-30 | 宝山钢铁股份有限公司 | Tension control system and method for planetary gear structure tension roller type evener |
| CN102500659A (en) * | 2011-11-24 | 2012-06-20 | 宝钢工程技术集团有限公司 | Inlet anti-crease rollers in stainless steel flattening unit |
| CN102626718A (en) * | 2012-04-13 | 2012-08-08 | 中冶南方工程技术有限公司 | Control method for high-strength steel straightening and leveling unit |
| CN103433297A (en) * | 2013-08-22 | 2013-12-11 | 攀钢集团攀枝花钢钒有限公司 | Tension stable control device for skin pass mill |
| CN204583915U (en) * | 2015-04-28 | 2015-08-26 | 中冶赛迪工程技术股份有限公司 | Hot-strip skin pass mill |
| CN105642677A (en) * | 2016-03-25 | 2016-06-08 | 首钢总公司 | Method and device for removing roll marks on surface of band steel |
| CN108273870A (en) * | 2018-03-19 | 2018-07-13 | 无锡市锡东橡塑机械有限公司 | A kind of belt steel flating machine |
| CN110038907A (en) * | 2019-04-19 | 2019-07-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method controlling planisher and the electrohydraulic servo system for controlling planisher |
| CN110227723A (en) * | 2019-06-09 | 2019-09-13 | 宝钢湛江钢铁有限公司 | A kind of parameter control method of six roller Cold-Rolled Strip Temper Mill initial segment of continuous annealing |
| CN111299324A (en) * | 2019-12-03 | 2020-06-19 | 攀钢集团西昌钢钒有限公司 | Hot-rolled strip steel leveling method |
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