CN112547810A - Method for detecting and improving axial force of hot continuous rolling mill - Google Patents
Method for detecting and improving axial force of hot continuous rolling mill Download PDFInfo
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- CN112547810A CN112547810A CN202011313388.2A CN202011313388A CN112547810A CN 112547810 A CN112547810 A CN 112547810A CN 202011313388 A CN202011313388 A CN 202011313388A CN 112547810 A CN112547810 A CN 112547810A
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- working roll
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- axial force
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- 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
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- 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
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- 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
- B21B2038/002—Measuring axial forces of rolls
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Abstract
The invention discloses a method for detecting and improving axial force of a hot continuous rolling mill, and belongs to the technical field of metal material processing. The method comprises the following steps: the axial force and the axial deviation of the working roll are detected by the output current of the working roll shifting cylinder, the corresponding working roll bearing seat sliding plate or rolling mill housing sliding plate is adjusted, the axial deviation of the working roll is corrected, and the axial force is improved. The method is applied to 1780 hot continuous rolling units of the company, has good effect, and avoids the burning loss of the bearing seat of the working roll and the breakage accident of the clamping plate cylinder of the working roll. Meanwhile, the rolling stability of the rolling mill is obviously improved, the shape control is obviously improved, and the proportion of the strip steel tail-flicking accidents is reduced by 30 percent.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a method for detecting and improving axial force of a hot continuous rolling mill.
Background
In the hot continuous rolling process, due to the fact that deviation exists between a rolling mill housing and a working roll bearing seat during manufacturing and installation and the reasons of abrasion, corrosion and the like during use, the axis of a working roll is not perpendicular to a rolling central line or is not parallel to the axis between the working roll and the working roll, so that the working roll can generate an axial component force during rotation to cause axial movement of the working roll, and the axial component force is transmitted to equipment such as the rolling mill housing, a clamping plate cylinder, a main motor and the like through the working roll bearing seat. As a harmful factor in the production process, the axial force is objective, the maximum axial force can reach 8-10% of the rolling force, so that serious equipment accidents such as burning loss of a bearing seat of a working roll, damage of a clamping plate cylinder of the working roll, peeling of a roll surface of the working roll, damage of a main motor and the like can be caused, meanwhile, the precision of a rolling mill can be reduced due to the axial force, the control of the plate shape is difficult, and production accidents such as tail flicking, steel piling and the like can be caused.
At present, axial force detection devices are installed on few hot continuous rolling mills, and the axial force detection devices are not generally applied due to high equipment investment and high maintenance cost. Most hot continuous rolling mills do not have an axial force detection device and cannot detect axial force on line, and a special measuring tool is usually adopted to perform off-line measurement on the window size of a rolling mill housing or the size of a working roll bearing seat, judge the offset direction of the axis of a working roll and repair a sliding plate of the rolling mill housing or the sliding plate of the working roll bearing seat, so that the axial force is improved. The method has the advantages that the technical difficulty is high, the misjudgment is more, because the measured size of the rolling mill housing window and the size of the working roll bearing seat are the whole size, but not the size of each part from the rolling center line, the position where the axial line of the working roll is deviated is difficult to judge, if the judgment is wrong, the axial line of the working roll is deviated more, the axial force is larger, and the damage effect of the axial force is intensified. Meanwhile, the method needs off-line measurement, the measurement period is long, and long-time shutdown is specially arranged, so that the rolling line operation rate is influenced.
Disclosure of Invention
The invention aims to provide a method for detecting and improving the axial force of a hot continuous rolling mill, which can accurately, quickly and real-timely judge the axial force and the deviation of the axial line of a working roll, and repair a sliding plate of a mill housing or a sliding plate of a bearing seat of the working roll in time, thereby improving the axial force and solving the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for detecting axial force of a hot continuous rolling mill detects the axial force and axial deviation of a working roll through output current of a working roll shifting cylinder. The current output by the working roll shifting cylinder refers to the current output by the working roll shifting cylinder when a rolled piece is rolled in the rolling mill, but not the current output by the working roll shifting cylinder when the working roll is shifted.
Further, the output current of the working roll shifting cylinder is expressed by the percentage of the current capacity of the working roll shifting cylinder control system, and the amplitude limit is +/-100%. The method specifically comprises the following steps: when the working roll has no axial play, the output current of the working roll shifting cylinder is zero; when the working roll moves towards the transmission side, the output current of the working roll shifting cylinder is a positive value; when the working roll moves to the operation side, the output current of the working roll shifting cylinder is a negative value.
Further, it is detected axial force and working roll axis skew to scurry roller jar output current through the working roll, specifically include: when the output current of a working roll shifting cylinder at a certain position of a certain frame is a positive value, the direction of an axial force is the operation side of the rolling mill, the axis of the working roll deviates to the inlet of the rolling mill at the operation side and deviates to the outlet of the rolling mill at the transmission side; when the output current of the working roll shifting cylinder at a certain position of a certain frame is a negative value, the direction of the axial force is the transmission side of the rolling mill, the axis of the working roll deviates to the inlet of the rolling mill at the transmission side and deviates to the outlet of the rolling mill at the operation side.
The method for improving axial force of hot continuous rolling mill is characterized by that according to the result obtained by detection method the correspondent working roll bearing seat slide plate or rolling mill housing slide plate can be regulated, and the axial deviation of working roll can be corrected so as to improve axial force.
Further, adjusting the work roll bearing block slide plate or the rolling mill housing slide plate specifically includes:
(1) when the axis of the working roll deviates to the inlet of the rolling mill at the operation side and deviates to the outlet of the rolling mill at the transmission side, a gasket is added in the sliding plate of the bearing seat of the working roll at the inlet of the operation side or the sliding plate of the housing of the rolling mill, and simultaneously a gasket is added in the sliding plate of the bearing seat of the working roll at the outlet of the transmission side or the sliding plate of the housing of the rolling mill; or the gaskets are reduced in the sliding plate of the working roller bearing seat at the outlet of the operation side or the sliding plate of the rolling mill housing, and the gaskets are reduced in the sliding plate of the working roller bearing seat at the inlet of the transmission side or the sliding plate of the rolling mill housing;
(2) when the axis of the working roll deviates from the inlet of the rolling mill on the transmission side and deviates from the outlet of the rolling mill on the operation side, the method for adding and subtracting the gasket in the sliding plate of the bearing seat of the working roll or the sliding plate of the housing of the rolling mill is opposite to the method (1). Specifically, when the axis of a working roll deviates to the inlet of a rolling mill on the transmission side and deviates to the outlet of the rolling mill on the operation side, a gasket is added in a sliding plate of a bearing seat of the working roll at the inlet of the transmission side or a sliding plate of a housing of the rolling mill, and simultaneously, a gasket is added in a sliding plate of a bearing seat of the working roll at the outlet of the operation side or a sliding plate of a housing of the rolling mill; or the gaskets are reduced in the sliding plate of the bearing seat of the working roll at the outlet of the transmission side or the sliding plate of the housing of the rolling mill, and the gaskets are reduced in the sliding plate of the bearing seat of the working roll at the inlet of the operation side or the sliding plate of the housing of the rolling mill.
Furthermore, when the output current of the working roll shifting cylinder is less than or equal to | +/-0.2% |, the sliding plate of the bearing seat of the working roll or the sliding plate of the housing of the rolling mill is not required to be adjusted; when the output current of the roller shifting cylinder of the working roller is more than +/-0.2% | in | +/-10% |, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted by 0.3mm-1.0 mm; when the output current of the roller shifting cylinder of the working roller is more than +/-10% | +/-20% |, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted by 1.0mm-1.5 mm; when the output current of the roller shifting cylinder of the working roller is greater than +/-20 percent, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted to be 1.5mm-2.0 mm.
Further, when axial force only appears on a certain fixed set of working roll, the axial deviation of the working roll caused by the size deviation of the bearing seat of the working roll is caused, and the sliding plate of the bearing seat of the working roll is adjusted; when axial force is generated on different working rolls of the same stand, the axial line of the working roll is deviated due to the deviation of the central line of the window of the rolling mill housing of the stand, and the sliding plate of the rolling mill housing is adjusted.
Compared with the prior art, the invention has the beneficial effects that:
1. the inventor finds that when a rolled piece is rolled in a rolling mill, if the axis of a working roll deviates, an axial force is formed due to the deviation of the axis when the working roll rotates, the working roll drives a bearing seat to generate axial movement, and a reaction force of the axial force is generated on the bearing seat by a working roll shifting cylinder in order to keep the working roll at the original shifting position, so that the working roll shifting cylinder has current output, the larger the axial force is, the larger the current output of the working roll shifting cylinder is, and the axial force can be detected through the output of the current of the working roll shifting cylinder.
2. The invention utilizes the output current of the working roll shifting cylinder to detect the axial force of the rolling mill and the axial deviation of the working roll, and corrects the axial force of the working roll by adjusting the working roll bearing seat sliding plate or the rolling mill housing sliding plate gasket, thereby improving the axial force. The method is applied to 1780 hot continuous rolling units of the company, the effect is good, and the burning loss of the bearing seat of the working roll and the breakage accident of the clamping plate cylinder of the working roll do not occur in 5 consecutive years.
3. After the invention is put into application, the rolling stability of the rolling mill is obviously improved, the shape control is obviously improved, and the tail-flick accident ratio of the strip steel is reduced by 30 percent.
Detailed Description
The technical solutions and effects of the present invention will be further described with reference to specific examples, but the scope of the present invention is not limited thereto.
Example 1
The method for detecting the axial force of the hot continuous rolling mill in the embodiment is applied to a seven-stand rolling mill system of a 1780mm hot continuous rolling finishing mill group of the company. The system comprises a working roll, a working roll bearing seat sliding plate, a rolling mill housing sliding plate, a working roll shifting cylinder and a control system. The working rolls are used for transmitting torque and rolling pressure to enable metal to generate plastic deformation; the working roll bearing seats are arranged at two ends (an operation side and a transmission side) of the working roll, and are arranged in a window of a rolling mill housing together with the working roll to fix the working roll; the rolling mill housing comprises an operation side housing and a transmission side housing, and a working roll bearing seat are fixed through a housing window; the working roll bearing block sliding plate is arranged on the outer side of the working roll bearing block and used for adjusting the size of the working roll bearing block so as to keep the position of a working roll in a window of a rolling mill housing; the rolling mill housing slide plates are respectively arranged at the inner sides of the rolling mill housing at the operation side and the transmission side and used for adjusting the size of the window of the rolling mill housing so as to keep the position of the working roll in the window of the rolling mill housing; the working roll shifting cylinder and the control system are arranged on the operation side of the rolling mill and generate roll shifting force to enable the working roll to axially shift to reach a target position.
The method for detecting the axial force of the hot continuous rolling mill in the embodiment is to detect the axial force and the axial deviation of the working roll through the output current of the working roll shifting cylinder. The current output by the working roll shifting cylinder refers to the current output by the working roll shifting cylinder when a rolled piece is rolled in the rolling mill, but not the current output by the working roll shifting cylinder when the working roll is shifted.
In this embodiment, the output current of the working roll shifting cylinder is expressed by the percentage of the current capacity of the working roll shifting cylinder control system, and the amplitude limit is ± 100%. The method specifically comprises the following steps: when the working roll has no axial play, the output current of the working roll shifting cylinder is zero; when the working roll moves towards the transmission side, the output current of the working roll shifting cylinder is a positive value; when the working roll moves to the operation side, the output current of the working roll shifting cylinder is a negative value.
In this embodiment, the roll shifting cylinder output current through the working roll detects the axial force and the axial deviation of the working roll, and specifically includes: when the output current of a working roll shifting cylinder at a certain position of a certain frame is a positive value, the direction of an axial force is the operation side of the rolling mill, the axis of the working roll deviates to the inlet of the rolling mill at the operation side and deviates to the outlet of the rolling mill at the transmission side; when the output current of the working roll shifting cylinder at a certain position of a certain frame is a negative value, the direction of the axial force is the transmission side of the rolling mill, the axis of the working roll deviates to the inlet of the rolling mill at the transmission side and deviates to the outlet of the rolling mill at the operation side.
Example 2
According to the method for improving the axial force of the hot continuous rolling mill in the embodiment, the corresponding work roll bearing seat sliding plate or rolling mill housing sliding plate is adjusted according to the detection result obtained by the detection method in the embodiment 1, the axial deviation of the work roll is corrected, and the axial force is improved.
In this embodiment, adjusting work roll bearing block slide or rolling mill housing slide specifically includes:
(1) when the axis of the working roll deviates to the inlet of the rolling mill at the operation side and deviates to the outlet of the rolling mill at the transmission side, a gasket is added in the sliding plate of the bearing seat of the working roll at the inlet of the operation side or the sliding plate of the housing of the rolling mill, and simultaneously a gasket is added in the sliding plate of the bearing seat of the working roll at the outlet of the transmission side or the sliding plate of the housing of the rolling mill; or the gaskets are reduced in the operating side outlet working roll bearing seat sliding plate or the rolling mill housing sliding plate, and the gaskets are reduced in the transmission side inlet working roll bearing seat sliding plate or the rolling mill housing sliding plate;
(2) when the axis of the working roll deviates from the inlet of the rolling mill on the transmission side and deviates from the outlet of the rolling mill on the operation side, the method for adding and subtracting the gasket in the sliding plate of the bearing seat of the working roll or the sliding plate of the housing of the rolling mill is opposite to the method (1). Specifically, when the axis of a working roll deviates to the inlet of a rolling mill on the transmission side and deviates to the outlet of the rolling mill on the operation side, a gasket is added in a sliding plate of a bearing seat of the working roll at the inlet of the transmission side or a sliding plate of a housing of the rolling mill, and simultaneously, a gasket is added in a sliding plate of a bearing seat of the working roll at the outlet of the operation side or a sliding plate of a housing of the rolling mill; or the gaskets are reduced in the sliding plate of the bearing seat of the working roll at the outlet of the transmission side or the sliding plate of the housing of the rolling mill, and the gaskets are reduced in the sliding plate of the bearing seat of the working roll at the inlet of the operation side or the sliding plate of the housing of the rolling mill.
In the embodiment, when the output current of the working roll shifting cylinder is less than or equal to | +/-0.2% |, the sliding plate of the bearing seat of the working roll or the sliding plate of the housing of the rolling mill does not need to be adjusted; when the output current of the roller shifting cylinder of the working roller is more than +/-0.2% | in | +/-10% |, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted by 0.3mm-1.0 mm; when the output current of the roller shifting cylinder of the working roller is more than +/-10% | +/-20% |, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted by 1.0mm-1.5 mm; when the output current of the roller shifting cylinder of the working roller is greater than +/-20 percent, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted to be 1.5mm-2.0 mm.
In the embodiment, when the axial force is only applied to a certain fixed set of working rolls, the axial force is the deviation of the working roll axis caused by the size deviation of the bearing seat of the working roll, and the sliding plate of the bearing seat of the working roll is adjusted; when axial force is generated on different working rolls of the same stand, the axial line of the working roll is deviated due to the deviation of the central line of the window of the rolling mill housing of the stand, and the sliding plate of the rolling mill housing is adjusted.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The method for detecting the axial force of the hot continuous rolling mill is characterized in that the axial force and the axial deviation of a working roll are detected by the aid of output current of a working roll shifting cylinder.
2. The method for detecting the axial force of the hot continuous rolling mill according to claim 1, wherein the output current of the working roll shifting cylinder is expressed by the percentage of the current capacity of a working roll shifting cylinder control system, and the amplitude limit is +/-100%; the method specifically comprises the following steps: when the working roll has no axial play, the output current of the working roll shifting cylinder is zero; when the working roll moves towards the transmission side, the output current of the working roll shifting cylinder is a positive value; when the working roll moves to the operation side, the output current of the working roll shifting cylinder is a negative value.
3. The method for detecting the axial force of the hot continuous rolling mill according to claim 2, wherein the axial force and the axial deviation of the working roll are detected by the output current of the working roll shifting cylinder, and the method specifically comprises the following steps: when the output current of a working roll shifting cylinder at a certain position of a certain frame is a positive value, the direction of an axial force is the operation side of the rolling mill, the axis of the working roll deviates to the inlet of the rolling mill at the operation side and deviates to the outlet of the rolling mill at the transmission side; when the output current of the working roll shifting cylinder at a certain position of a certain frame is a negative value, the direction of the axial force is the transmission side of the rolling mill, the axis of the working roll deviates to the inlet of the rolling mill at the transmission side and deviates to the outlet of the rolling mill at the operation side.
4. The method for improving the axial force of the hot continuous rolling mill is characterized in that the method for improving the axial force is to adjust corresponding work roll bearing seat sliding plates or rolling mill housing sliding plates according to the result obtained by the detection method, correct the axial deviation of the work rolls and improve the axial force.
5. The method for improving the axial force of a hot continuous rolling mill according to claim 4, wherein the adjusting of the work roll chock slide or the mill housing slide specifically comprises:
(1) when the axis of the working roll deviates to the inlet of the rolling mill at the operation side and deviates to the outlet of the rolling mill at the transmission side, a gasket is added in the sliding plate of the bearing seat of the working roll at the inlet of the operation side or the sliding plate of the housing of the rolling mill, and simultaneously a gasket is added in the sliding plate of the bearing seat of the working roll at the outlet of the transmission side or the sliding plate of the housing of the rolling mill; or the gaskets are reduced in the sliding plate of the working roller bearing seat at the outlet of the operation side or the sliding plate of the rolling mill housing, and the gaskets are reduced in the sliding plate of the working roller bearing seat at the inlet of the transmission side or the sliding plate of the rolling mill housing;
(2) when the axis of the working roll deviates from the inlet of the rolling mill on the transmission side and deviates from the outlet of the rolling mill on the operation side, the method for adding and subtracting the gasket in the sliding plate of the bearing seat of the working roll or the sliding plate of the housing of the rolling mill is opposite to the method (1).
6. The method for improving the axial force of a hot continuous rolling mill according to claim 4, wherein when the output current of the working roll shifting cylinder is less than or equal to | ± (0.2% |), the sliding plate of the bearing seat of the working roll or the sliding plate of the mill housing is not required to be adjusted; when the output current of the roller shifting cylinder of the working roller is more than +/-0.2% | in | +/-10% |, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted by 0.3mm-1.0 mm; when the output current of the roller shifting cylinder of the working roller is more than +/-10% | +/-20% |, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted by 1.0mm-1.5 mm; when the output current of the roller shifting cylinder of the working roller is greater than +/-20 percent, the sliding plate gasket of the bearing seat of the working roller or the sliding plate gasket of the housing of the rolling mill is adjusted to be 1.5mm-2.0 mm.
7. The method for improving the axial force of a hot continuous rolling mill according to claim 4, wherein when the axial force is only applied to a certain fixed set of working rolls, the axial force is caused by the deviation of the working roll axis due to the dimensional deviation of the working roll bearing seat, and the working roll bearing seat sliding plate is adjusted; when axial force is generated on different working rolls of the same stand, the axial line of the working roll is deviated due to the deviation of the central line of the window of the rolling mill housing of the stand, and the sliding plate of the rolling mill housing is adjusted.
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| CN202011313388.2A CN112547810B (en) | 2020-11-20 | 2020-11-20 | Method for detecting and improving axial force of hot continuous rolling mill |
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