CN116393525A - Transverse deflection control method for working rolls of 4-roll and 6-roll rolling mill - Google Patents

Transverse deflection control method for working rolls of 4-roll and 6-roll rolling mill Download PDF

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Publication number
CN116393525A
CN116393525A CN202310020074.0A CN202310020074A CN116393525A CN 116393525 A CN116393525 A CN 116393525A CN 202310020074 A CN202310020074 A CN 202310020074A CN 116393525 A CN116393525 A CN 116393525A
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roller
roll
rolling
working
stress
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CN202310020074.0A
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李坤
张子强
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/18—Adjusting or positioning rolls by moving rolls axially
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention relates to a transverse deflection control method for working rolls of 4-roll and 6-roll rolling mills, which comprises the following steps: s1, calculating a rolling force value and a front-back tension difference according to a rolling schedule; s2, calculating the eccentricity of a roller according to the front-rear tension difference and the rolling force value of the strip steel, wherein the target is set to enable the transverse stress of the roller body to be zero; s3, adjusting the horizontal position of the working roller to enable the offset distance between the center lines of the working roller and the supporting roller to reach a calculated value; s4, rolling down the roller, building up strip steel, checking the stress condition of the roller detected by a horizontal stress detector of the working roller, and opening and adjusting the roller gap to correct the eccentricity again if the stress exceeds a set limit value; s5, starting rolling when the roll body of the working roll is stressed within a set range. The method is suitable for rolling various specifications and steel grades, has strong adaptability to rolling environments, ensures that the transverse stress of the roll body is controlled in a certain range, can effectively reduce the transverse deflection of the roll body, and obtains better plate shape.

Description

Transverse deflection control method for working rolls of 4-roll and 6-roll rolling mill
Technical Field
The invention relates to the technical field of strip processing, in particular to a method for processing strips, relates to a transverse deflection control method for working rolls of a 4-roll rolling mill and a 6-roll rolling mill, which is applied to the 4-roll rolling mill and the 6-roll rolling mill.
Background
The technique is similar for 4 and 6 roll mills, and a 4 roll mill is described herein as an example. The rolling force and the tension influence in the rolling process of the 4-roll mill, and the working roll easily sways transversely in the stand to influence the rolling stability. In order to ensure the stability of the lateral position of the working roll, the center lines of the supporting roll and the working roll are generally designed to be eccentric, as shown in fig. 1, and the eccentric design amount ensures that the working roll always leans against one side of the housing under the action of rolling force, but cannot shake laterally. The working roll is acted by the supporting roll, the strip steel and the housing during rolling, the roll body is stressed in the horizontal direction to enable the roll to generate certain transverse deflection, deflection can seriously affect the rolling process, the product quality, the roll body and the service life of the bearing, deflection is mainly related to the stress size of the roll body and the diameter of the roll, the diameter size of the working roll of the 4-roll mill is limited, the working roll cannot be too small, and the transverse deflection is controlled by limiting the size of the working roll in the world at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a transverse deflection control method for a working roll of a 4-roll and 6-roll rolling mill, which is suitable for rolling of various specifications and steel types, has strong adaptability to rolling environments, ensures that the transverse stress of the roll body is controlled within a certain range, can effectively reduce the transverse deflection of the roll body, and obtains better plate shape.
The technical scheme adopted for solving the technical problems is as follows: a transverse deflection control method for working rolls of a 4-roll and 6-roll rolling mill is constructed, and comprises the following steps:
s1, calculating a rolling force value and a front-back tension difference according to a rolling schedule;
s2, calculating the eccentricity of a roller according to the front-rear tension difference and the rolling force value of the strip steel, wherein the target is set to enable the transverse stress of the roller body to be zero;
s3, adjusting the horizontal position of the working roller to enable the offset distance between the center lines of the working roller and the supporting roller to reach a calculated value;
s4, rolling down the roller, building up strip steel, checking the stress condition of the roller detected by a horizontal stress detector of the working roller, and opening and adjusting the roller gap to correct the eccentricity again if the stress exceeds a set limit value;
s5, starting rolling when the roll body of the working roll is stressed within a set range.
According to the above scheme, in the step S2, the eccentricity e is calculated by the following formula:
Figure SMS_1
wherein R is the radius of a working roll, R is the radius of a supporting roll, F0 is the rolling force, F2 is the horizontal component of the rolling force, T0 is the front tension of the strip steel, T1 is the rear tension T1 of the strip steel, and Fx is an unstable factor.
According to the scheme, the positioning devices are respectively arranged at the outlet ends of the bearing seats at the two sides of the working roller and are used for adjusting the horizontal position of the working roller.
According to the scheme, the positioning device comprises the inclined wedge adjusting block, one part of the inclined wedge adjusting block is fixed on the mill housing, and the other part of the inclined wedge adjusting block is driven by the hydraulic cylinder to stretch and retract, so that the left side positioning of the roll bearing block is realized.
According to the scheme, the thrust device is arranged at the inlet end of the working roller, and the pressure sensor and the displacement sensor are arranged in the thrust device
According to the scheme, the thrust device is a cushion block pushed by the hydraulic cylinder, the hydraulic cylinder is arranged on the right side housing, and after the roller is pushed into the housing, the hydraulic cylinder stretches out to tightly prop against the right side of the working roller, and the working roller is tightly leaned against the left side positioning device, so that the position of the center of the working roller relative to the center of the housing is adjusted and fixed.
The principle of the invention is as follows:
the stress of the working roll body is mainly strip steel tension, backup roll rolling force and other small external forces. The tension of the strip steel is set by steel rolling process personnel according to the rolling schedule. The set value of the rolling force can be calculated according to the strength, specification and rolling reduction of the strip steel, but the actual value of the rolling force is regulated in real time by an AGC automatic control system, and a small difference exists between the calculated value and the actual value. The horizontal component of the rolling force is influenced by the rolling force and the eccentricity between the working roll and the supporting roll, and the horizontal component of the rolling force of the roll body of the working roll can be adjusted by adjusting the eccentricity of the roll. The horizontal component of the rolling force and the tension difference between the front and the rear of the strip steel are comprehensively considered, and the roll body of the working roll is controlled to be stressed within a certain range by adjusting the eccentricity of the roll, so that the transverse deflection of the working roll is reduced.
The method for controlling the transverse deflection of the working rolls of the 4-roll and 6-roll rolling mills has the following beneficial effects:
when rolling steel, the smaller the roller diameter of the working roller, the smaller the rolling force and the rolling moment required during rolling, and the smaller the elastic flattening of the roller, so that the rolling with smaller roller diameter is required during rolling the strip steel with higher strength. However, when rolling, the transverse force applied to the roller can cause the roller to flex transversely, the bending deformation to a certain degree can seriously affect the plate shape quality, and the smaller the roller diameter of the working roller is, the larger the bending deformation is when the transverse force is applied, so the roller diameters of the working rollers of the 4-roller and 6-roller rolling mills are severely limited by the transverse bending deformation of the roller, and the roller diameters of the working rollers of the conventional wide strip steel 4-roller and 6-roller rolling mills are all more than 300 mm. The method can reduce the transverse stress of the working roller, and the working roller diameter is used in a smaller direction.
The method is suitable for rolling various specifications and steel grades, has stronger adaptability to rolling environment, ensures that the transverse stress of the roll body is controlled in a certain range, can effectively reduce the transverse deflection of the roll body, obtains better plate shape, and allows the 4-roll mill and the 6-roll mill to adopt smaller roll diameter.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a 4, 6 roll mill;
FIG. 2 is a schematic diagram of the apparatus used in the method for controlling the lateral deflection of the work rolls of the rolling mill 4 and 6 according to the present invention;
in the figure 1: work roll, 2: backup roll, 3: strip steel, 4: a thrust device; 5: adjusting device, 6: bearing block, 7: a pressure sensor.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
The transverse deflection control method of the working rolls of the 4-roll and 6-roll rolling mill comprises the following steps:
s1, calculating a rolling force value and a front-back tension difference according to a rolling schedule.
S2, calculating the eccentricity of the roller according to the front-rear tension difference and the rolling force value of the strip steel, and setting the target to enable the transverse stress of the roller body to be zero.
As shown in fig. 1, set up: work roll radius R, backup roll radius R, eccentricity e, rolling force F0, rolling force horizontal component F2, strip front tension T0, strip back tension T1, other instability factors Fx, such as: the equipment machining precision, the friction state between the strip steel and the roller and other uncertain factors need to be compensated through testing, and then:
and (3) making: f2+t1-t0+fx=0
And (3) calculating:
Figure SMS_2
s3, adjusting the horizontal position of the working roller to enable the offset distance between the center lines of the working roller and the supporting roller to reach a calculated value.
S4, rolling down, building strip steel, checking the stress condition of the roller detected by a horizontal stress detector of the working roller, and opening and adjusting the roller gap to correct the eccentricity again if the stress exceeds a set limit value. And feeding the deviation back to the calculation library to correct the calculation formula.
S5, starting rolling when the stress of the roller body is within a set range.
The method is suitable for rolling various specifications and steel grades, has stronger adaptability to rolling environment, ensures that the transverse stress of the roll body is controlled in a certain range, can effectively reduce the transverse deflection of the roll body, obtains better plate shape, and allows the 4-roll mill and the 6-roll mill to adopt smaller roll diameter. When rolling the strip steel, the smaller the roller diameter of the working roller is, the smaller the rolling force and the rolling moment are required during rolling, and the smaller the elastic flattening of the roller is, so that the strip steel with higher rolling strength is required to be rolled by a small roller diameter. However, when rolling, the transverse force applied to the roller can cause the roller to flex transversely, the bending deformation to a certain degree can seriously affect the plate shape quality, and the smaller the diameter of the working roller is, the larger the bending deformation is when the transverse force is applied, so the diameter of the working roller of the 4-roller and 6-roller rolling mills is severely limited by the transverse bending deformation of the roller, and the diameters of the working rollers of the conventional wide strip 4-6-roller rolling mills are all more than 300 mm. The method can reduce the transverse stress of the working roller, and the working roller diameter is used in a smaller direction.
As shown in fig. 2, the device is used for the transverse deflection control method of the working rolls of the 4-roll and 6-roll rolling mills. On the bearing frame of work roll both sides, the exit end installs a positioner respectively, and it can be in the horizontal position of accurate adjustment work roll in certain scope, and the position accuracy reaches 1 micron. The inlet end is respectively provided with a thrust device, the inside of the thrust device is provided with a high-precision pressure sensor, the thrust force can be accurately measured, and the thrust position is measured by the high-precision displacement sensor.
The positioning device in the embodiment adopts a wedge adjusting block, one part of the wedge is fixed on a mill housing, and the other part is driven by a hydraulic cylinder to stretch and retract, so that the left side positioning of the roll bearing block is realized. The thrust device is a cushion block pushed by a hydraulic cylinder, the hydraulic cylinder is arranged on the right side housing, and after the roller is pushed into the housing, the hydraulic cylinder stretches out to tightly prop the right side of the working roller, so that the working roller is tightly propped against the left side positioning device. The position of the working roll center relative to the housing center is adjusted and fixed. The positioning device and the thrust device are not limited to specific structures in the present invention, but are only one device design for realizing the method in the present embodiment.
The invention also provides a specific example, which comprises the following steps:
1. before rolling, calculating the required eccentricity e according to a rolling rule, and calculating the stroke of the positioning device according to the eccentricity, wherein the calculation formula is as follows:
Figure SMS_3
assuming t0=300kn, t1=240kn, fx=0kn, f0=8000kn, r=200 mm, r=650 mm, e=6.375 mm is calculated.
2. The positioning device is positioned and locked.
3. The hydraulic cylinder stretches out to output a larger thrust, the thrust is obviously larger than the horizontal stress of the roller body, and the pressure is kept unchanged. The pressure sensor can measure the horizontal pressure born by the bearing pedestal and record the horizontal pressure, and the transverse horizontal stress of the roller body of the calibrated working roller is zero.
4. Pressing down, building up, checking the pressure change measured by the pressure sensor, wherein the pressure change value is the transverse horizontal force born by the roller body, and automatically detecting whether the pressure change value exceeds a set limit value.
5. If the limit value is exceeded, the roll gap is opened, the offset value is revised, and the calculation formula is revised. The correction process is to readjust the eccentric distance e of the roller and correct the Fx value in the formula.
6. And rolling the roller until the stress of the roller body is within a set value range.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims (6)

1. A method for controlling transverse deflection of working rolls of 4 and 6 roller mills is characterized by comprising the following steps:
s1, calculating a rolling force value and a front-back tension difference according to a rolling schedule;
s2, calculating the eccentricity of a roller according to the front-rear tension difference and the rolling force value of the strip steel, wherein the target is set to enable the transverse stress of the roller body to be zero;
s3, adjusting the horizontal position of the working roller to enable the offset distance between the center lines of the working roller and the supporting roller to reach a calculated value;
s4, rolling down the roller, building up strip steel, checking the stress condition of the roller detected by a horizontal stress detector of the working roller, and opening and adjusting the roller gap to correct the eccentricity again if the stress exceeds a set limit value;
s5, starting rolling when the roll body of the working roll is stressed within a set range.
2. The method for controlling lateral deflection of work rolls of 4, 6-high rolling mill according to claim 1, wherein in said step S2, the eccentricity e is calculated by the following formula:
Figure QLYQS_1
wherein R is the radius of a working roll, R is the radius of a supporting roll, F0 is the rolling force, F2 is the horizontal component of the rolling force, T0 is the front tension of the strip steel, T1 is the rear tension T1 of the strip steel, and Fx is an unstable factor.
3. The method for controlling the transverse deflection of the working rolls of the 4-roll and 6-roll rolling mill according to claim 1, wherein the outlet ends are respectively provided with a positioning device on bearing blocks at two sides of the working rolls, and the positioning devices are used for adjusting the horizontal position of the working rolls.
4. A method of controlling lateral deflection of a work roll of a 4-6-high rolling mill according to claim 3, wherein the positioning means comprises a wedge adjusting block, one part of the wedge adjusting block is fixed on the mill housing, and the other part is driven to expand and contract by a hydraulic cylinder, thereby realizing left side positioning of the roll chock.
5. A method of controlling lateral deflection of a work roll of a 4, 6-high rolling mill according to claim 3, wherein a thrust device is installed at the inlet end of the work roll, and a pressure sensor and a displacement sensor are installed inside the thrust device.
6. The method according to claim 5, wherein the thrust device is a pad pushed by a hydraulic cylinder, the hydraulic cylinder is mounted on a right side housing, and when the roller is pushed into the housing, the hydraulic cylinder stretches out to press the right side of the working roller tightly, and the working roller is tightly leaned against a left side positioning device, so that the position of the center of the working roller relative to the center of the housing is adjusted and fixed.
CN202310020074.0A 2023-01-06 2023-01-06 Transverse deflection control method for working rolls of 4-roll and 6-roll rolling mill Pending CN116393525A (en)

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Application Number Priority Date Filing Date Title
CN202310020074.0A CN116393525A (en) 2023-01-06 2023-01-06 Transverse deflection control method for working rolls of 4-roll and 6-roll rolling mill

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Application Number Priority Date Filing Date Title
CN202310020074.0A CN116393525A (en) 2023-01-06 2023-01-06 Transverse deflection control method for working rolls of 4-roll and 6-roll rolling mill

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CN116393525A true CN116393525A (en) 2023-07-07

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