CN111790758B - Calibration method and automatic roll changing control method for lower step pad of finishing mill - Google Patents
Calibration method and automatic roll changing control method for lower step pad of finishing mill Download PDFInfo
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- CN111790758B CN111790758B CN202010473153.3A CN202010473153A CN111790758B CN 111790758 B CN111790758 B CN 111790758B CN 202010473153 A CN202010473153 A CN 202010473153A CN 111790758 B CN111790758 B CN 111790758B
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- pad
- hydraulic cylinder
- lower step
- finishing mill
- step pad
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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
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
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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
Abstract
The invention belongs to the technical field of hot rolling, and discloses a calibration method and an automatic roll changing control method for a lower step pad of a finishing mill; the calibration method of the lower step pad of the finishing mill comprises the following steps: acquiring the height of the lower supporting surface of the lower supporting roller when the lower supporting surface is positioned on the supporting roller pulley; determining an Nth pad of the lower step pads corresponding to the height; pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate of the lower support roller; and calibrating the zero position of the hydraulic cylinder of the step pad by the roll changing position, and calibrating each pad of the lower step pad based on the distance L1. The calibration method of the lower step pad of the finishing mill provided by the invention can improve the accuracy of the shifting position of the lower step pad and the operation efficiency when the roll is automatically changed.
Description
Technical Field
The invention relates to the technical field of hot rolling, in particular to a calibration method and an automatic roll changing control method for a lower step pad of a finishing mill.
Background
In the production process of hot rolled strip steel, the height of a base plate is adjusted by reciprocating a lower step pad, the abrasion loss of the roll diameters of a working roll and a supporting roll is compensated, and the influence of the change of the roll diameter of the working roll on the height of a rolling line is compensated by different thicknesses of the step pad. However, in the automatic roll changing process, the position of the step pad is lost or inaccurate, so that the accuracy of the shifting position of the step pad is poor, and the operation efficiency is seriously influenced; meanwhile, equipment accidents that the lower supporting roller falls down inaccurately are easily caused.
Disclosure of Invention
The invention provides a calibration method and an automatic roll changing control method for a lower step pad of a finishing mill, and solves the technical problems of poor accuracy of a shifting position of the lower step pad and low operation efficiency in automatic roll changing in the prior art.
In order to solve the technical problem, the invention provides a calibration method of a lower step pad of a finishing mill, which comprises the following steps:
acquiring the height of the lower supporting surface of the lower supporting roller when the lower supporting surface is positioned on the supporting roller pulley;
determining an Nth pad of the lower step pads corresponding to the height;
pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate of the lower support roller;
and calibrating the zero position of the hydraulic cylinder of the step pad by the roll changing position, and calibrating each pad of the lower step pad based on the distance L1.
Furthermore, the gap value between the connecting pin shaft and the connecting sleeve of the stepped pad hydraulic cylinder and the lower stepped pad sliding frame is less than or equal to 2 mm.
Further, the moving speed of the rod of the step pad hydraulic cylinder is 100 mm/sec.
Further, after the zero position of the mechanical calibration is determined, recording the zero position in a control program of the step pad hydraulic cylinder, and setting the relative position between the magnetic ring of the step pad hydraulic cylinder and the magnetic scale to be zero.
An automatic roll changing control method for a finishing mill comprises the following steps:
controlling the stepped pad hydraulic cylinder to move the lower stepped pad to a target pad position according to the diameter of a working roll of the upper machine;
controlling the arc-shaped base plate of the lower supporting roller to fall to a target base position, and reinstalling the lower supporting roller and the working roller;
before the automatic roll changing process is operated, the zero position of a hydraulic cylinder of the step pad is calibrated mechanically in advance, and the judgment conditions of the positions of a lifting cylinder of the lower supporting roll and the position of the lower step pad during automatic roll changing are set;
the zero position of the mechanical calibration step pad hydraulic cylinder comprises:
acquiring the height of the lower supporting surface of the lower supporting roller when the lower supporting surface is positioned on the supporting roller pulley;
determining an Nth pad of the lower step pads corresponding to the height;
pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate of the lower support roller;
and calibrating the zero position of the hydraulic cylinder of the step pad by the roll changing position, and calibrating each pad of the lower step pad based on the distance L1.
Further, the control method further comprises: starting a vehicle to judge conditions;
the start-up determination condition includes: the in-place error numerical value of the lower step pad is within +/-5 mm;
and executing starting judgment after the lower supporting roller and the working roller are reloaded.
Further, the setting of the determination condition of the lower support roller lift cylinder during automatic roller change includes:
the in-place lifting judgment condition is that the pressure of the plug cavity of the lifting cylinder is more than 150bar and lasts for more than 12 seconds;
and the in-place descending judgment condition is that the pressure of the plug cavity of the lifting cylinder is less than 3bar and lasts for more than 5 seconds.
Further, the setting of the determination condition of the position of the lower step pad at the time of automatic roll change includes:
the in-place error of the Nth pad in the lower step pads is within +/-10 mm.
Furthermore, the gap value between the connecting pin shaft and the sleeve of the step pad hydraulic cylinder and the lower step pad sliding frame is less than or equal to 2 mm.
Further, the moving speed of the rod of the step pad hydraulic cylinder is 100 mm/sec.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the calibration method and the automatic roll changing control method for the lower step pad of the finishing mill, zero calibration is carried out through the equal-height relation between the lower support surface of the lower support roll and the Nth pad, so that the calibration relation between the lower step pad and a roll changing position can be directly obtained, the play error of the lower step pad caused by the abrasion of the connecting pin shaft of the hydraulic cylinder of the lower step pad and the sliding frame of the step pad and the gap generated by each connecting part of the sliding frame of the step pad is eliminated, and the lower support roll is prevented from falling down and being inaccurate; and the zero position inaccuracy of roll replacement caused by the internal leakage of the stepped cushion hydraulic cylinder and the zero drift of the proportional valve in the production process. The technical defect that the automatic roll changing control program is terminated due to inaccurate position or lost position of the lower step pad in the automatic roll changing process is effectively overcome, and the operation efficiency is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a lower support roll area of a finishing mill provided by an embodiment of the invention;
FIG. 2 is an enlarged view of a portion of the area I in FIG. 1;
description of the reference numerals: 1-lower supporting roll, 11-arc base plate, 2-step point hydraulic cylinder and 3-lower step pad.
Detailed Description
The embodiment of the application provides a calibration method of a lower step pad of a finishing mill and an automatic roll changing control method, and solves the technical problems that in the prior art, when the rolls are automatically changed, the accuracy of the shifting position of the lower step pad is poor, and the operation efficiency is low.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings of the specification and the specific embodiments, and it should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and the examples of the present application may be combined with each other without conflict.
Referring to fig. 1 and 2, a calibration method of a finishing mill lower step pad includes:
acquiring the height of the lower supporting surface of the lower supporting roller 1 when the lower supporting surface is positioned on the supporting roller pulley;
determining an Nth pad of the lower step pads 3 corresponding to the height;
pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder 2, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate 11 of the lower support roller;
the zero position of the step pad hydraulic cylinder 2 is calibrated by the roll changing position, and each pad of the lower step pad 3 is calibrated based on the distance L1.
And the gap value between the connecting pin shaft and the sleeve of the step pad hydraulic cylinder 2 and the lower step pad sliding frame is less than or equal to 2 mm. The moving speed of the rod of the step pad hydraulic cylinder 2 is 100 mm/sec.
After the zero position of the mechanical calibration is determined, the zero position is recorded in a control program of the stepped pad hydraulic cylinder 2, and the relative position between the magnetic ring of the stepped pad hydraulic cylinder 2 and the magnetic scale is set to be zero.
The embodiment also provides an automatic roll changing control method based on the calibration method.
An automatic roll changing control method for a finishing mill comprises the following steps:
controlling the stepped pad hydraulic cylinder 2 to move the lower stepped pad 3 to a target pad position according to the diameter of a working roll on the machine;
controlling the lower support roller arc-shaped base plate 11 to fall to a target base position, and reinstalling the lower support roller 1 and the working roller;
before the automatic roll changing process is operated, the zero position of a hydraulic cylinder 2 of the stepped pad is calibrated mechanically in advance, and the judgment conditions of the positions of a lifting cylinder of the lower supporting roll and the position of the lower stepped pad 3 during automatic roll changing are set;
the zero position of the mechanical calibration step pad hydraulic cylinder 2 comprises:
acquiring the height of the lower supporting surface of the lower supporting roller when the lower supporting surface is positioned on the supporting roller pulley;
determining an Nth pad of the lower step pads 3 corresponding to the height;
pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder 2, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate of the lower support roller;
the zero position of the step pad hydraulic cylinder 2 is calibrated by the roll changing position, and each pad of the lower step pad is calibrated based on the distance L1.
The present embodiment also provides a scheme of setting the start determination condition after the roll change is performed.
The start-up determination condition includes: the in-place error value of the lower step pad is within +/-5 mm;
and executing starting judgment after the lower supporting roller and the working roller are reloaded.
Specifically, the setting of the determination condition of the lower backup roll lift cylinder during automatic roll change includes:
the in-place lifting determination condition is that the pressure of a plug cavity of the lifting cylinder is more than 150bar and lasts for more than 12 seconds;
and the in-place descending judgment condition is that the pressure of the plug cavity of the lifting cylinder is less than 3bar and lasts for more than 5 seconds.
On the other hand, the determination conditions for setting the position of the lower step pad at the time of automatic roll change include:
the in-place error of the Nth pad in the lower step pads is within +/-10 mm.
This will be explained by an example.
The number of the lower step pads 3 is 12, the width of each step pad is 150mm, the length of each step pad is 830mm, and the thickness difference between the adjacent pads is 15 mm. The contact lower surface of the arc-shaped base plate 11 and the lower step pad 3 has the width of 135mm and the length of 800 mm. The sizes of the positioning holes of the arc-shaped base plate 11 are 150mm in width, 802mm in length and 20mm in depth. The gap value between the connecting pin shaft and the sleeve of the step pad hydraulic cylinder 2 and the step pad sliding frame is less than or equal to 2 mm. The judgment conditions of the automatic roll changing of the lower support roll lifting cylinder are set as follows: the in-place lifting judgment condition meets the requirements that the pressure of a plug cavity of a lifting cylinder is more than 150bar, and the time is delayed for 12 seconds; and (5) descending to the right position and judging conditions, and simultaneously meeting the requirement that the pressure of a plug cavity of the lifting cylinder is less than 3bar and delaying for 5 seconds. The moving speed of the cylinder rod of the step pad hydraulic cylinder 2 is 100 mm/s. After the support roller arc-shaped base plate 11 falls to the target base position, the judgment conditions of starting and steel interlocking satisfaction are set as follows: the numerical value of the error of the in-place position of the lower step pad 3 is controlled within +/-5 mm.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the calibration method and the automatic roll changing control method for the lower step pad of the finishing mill, provided by the embodiment of the application, zero calibration is carried out through the equal-height relation between the lower support surface of the lower support roll and the Nth pad, so that the calibration relation between the lower step pad and the roll changing position can be directly obtained, the play error of the lower step pad caused by the abrasion of the connecting pin shaft of the hydraulic cylinder of the lower step pad and the carriage of the step pad and the clearance generated by each connecting part of the carriage of the step pad is eliminated, and the lower support roll is prevented from falling down and being inaccurate; and the roll changing zero position is inaccurate due to the internal leakage of the stepped pad hydraulic cylinder and the zero drift of the proportional valve in the production process. The technical defect of automatic roll changing control program termination caused by inaccurate position or lost position of the lower step pad in the automatic roll changing process is effectively overcome, and meanwhile, the operation efficiency is improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A calibration method for a lower step pad of a finishing mill is characterized by comprising the following steps:
acquiring the height of a lower support surface of a lower support roller when the lower support roller is positioned on a support roller pulley;
determining an Nth pad of the lower step pads corresponding to the height;
pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate of the lower support roller;
and calibrating the zero position of the hydraulic cylinder of the step pad by the roll changing position, and calibrating each pad of the lower step pad based on the distance L1.
2. The method for calibrating a lower step pad of a finishing mill according to claim 1, wherein a clearance between a connecting pin and a sleeve of the hydraulic cylinder of the step pad and the carriage of the lower step pad is not more than 2 mm.
3. The calibration method of the lower step pad of the finishing mill as set forth in claim 1, wherein the moving speed of the cylinder rod of the step pad hydraulic cylinder is 100 mm/sec.
4. The method for calibrating a lower step pad of a finishing mill as set forth in claim 1, wherein after the zero position for mechanical calibration is determined, the zero position is recorded in a control program of the step pad hydraulic cylinder, and the relative position between the magnetic ring of the step pad hydraulic cylinder and the magnetic scale is set to zero.
5. An automatic roll changing control method of a finishing mill is characterized by comprising the following steps:
controlling a stepped pad hydraulic cylinder to move a lower stepped pad to a target pad position according to the diameter of a working roll of the upper machine;
controlling the arc-shaped base plate of the lower supporting roll to fall to a target base position, and reinstalling the lower supporting roll and the working roll;
before the automatic roll changing process is operated, the zero position of a hydraulic cylinder of the stepped pad is calibrated mechanically in advance, and the judgment conditions of the positions of a lifting cylinder of the lower supporting roll and the position of the lower stepped pad during automatic roll changing are set;
the zero position of the mechanical calibration step pad hydraulic cylinder comprises:
acquiring the height of the lower supporting surface of the lower supporting roller when the lower supporting surface is positioned on the supporting roller pulley;
determining an Nth pad of the lower step pads corresponding to the height;
pushing the Nth pad to a roller changing position through the action of a stepped pad hydraulic cylinder, and acquiring a distance L1 between the center line of the Nth pad and the center line of the arc-shaped pad plate of the lower support roller;
and calibrating the zero position of the hydraulic cylinder of the step pad by the roll changing position, and calibrating each pad of the lower step pad based on the distance L1.
6. The automatic roll change control method of a finishing mill according to claim 5, characterized by further comprising: starting a vehicle to judge conditions;
the start-up determination condition includes: the in-place error numerical value of the lower step pad is within +/-5 mm;
and executing starting judgment after the lower supporting roller and the working roller are reloaded.
7. The automatic roll change control method of a finishing mill according to claim 5, wherein the setting of the determination condition of the lower backup roll lift cylinder at the time of automatic roll change includes:
the in-place lifting judgment condition is that the pressure of the plug cavity of the lifting cylinder is more than 150bar and lasts for more than 12 seconds;
and the in-place descending judgment condition is that the pressure of the plug cavity of the lifting cylinder is less than 3bar and lasts for more than 5 seconds.
8. The finishing mill automatic roll change control method according to claim 5, wherein the determination condition for setting the position of the lower step pad at the time of automatic roll change includes:
the in-place error of the Nth pad in the lower step pads is within +/-10 mm.
9. The automatic roll changing control method of a finishing mill according to claim 5, characterized in that a clearance value between a connecting pin and a sleeve of the hydraulic cylinder of the step pad and the carriage of the lower step pad is not more than 2 mm.
10. The automatic roll change control method of a finishing mill according to claim 5, wherein a moving speed of a cylinder rod of the stepped pad hydraulic cylinder is 100 mm/sec.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010473153.3A CN111790758B (en) | 2020-05-29 | 2020-05-29 | Calibration method and automatic roll changing control method for lower step pad of finishing mill |
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| CN202010473153.3A CN111790758B (en) | 2020-05-29 | 2020-05-29 | Calibration method and automatic roll changing control method for lower step pad of finishing mill |
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| CN114130831B (en) * | 2021-11-30 | 2023-05-09 | 山东钢铁集团日照有限公司 | Device and method for calibrating position of step pad on rolling mill |
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| DE3504415A1 (en) * | 1985-02-08 | 1986-08-14 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | Apparatus for the axial displacement of rolls in roll stands |
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