CN112170508A - Method for safely calibrating roll gap of hot rolling mill - Google Patents
Method for safely calibrating roll gap of hot rolling mill Download PDFInfo
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- CN112170508A CN112170508A CN202010940814.9A CN202010940814A CN112170508A CN 112170508 A CN112170508 A CN 112170508A CN 202010940814 A CN202010940814 A CN 202010940814A CN 112170508 A CN112170508 A CN 112170508A
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- rolling mill
- rolling
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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
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
- B21B38/105—Calibrating or presetting roll-gap
Abstract
The invention discloses a method for safely calibrating a roll gap of a hot rolling mill, which comprises the following steps: and sequentially verifying the position of the rolling mill step plate, the elevation data of the rolling mill and the rolling force data of the top and the bottom of the rolling mill, and finishing the calibration of the roll gap of the rolling mill after the verification is passed. By the rolling mill calibration state detection program designed by the PLC system, in the rolling mill calibration process, the potential problems of human or equipment can be found according to the actual situation, and the automatic roll gap calibration program is immediately interrupted; the method is simple and practical and is easy to realize on site; the potential problem of the calibration of the rolling mill is quickly detected, the basis for diagnosing the equipment fault is provided, the vicious accident caused by the calibration is effectively reduced, the production safety in the industrial field is improved, and therefore the economic benefit is obvious.
Description
Technical Field
The invention belongs to the technical field of roll gap calibration of rolling mills, and particularly relates to a method for safely calibrating a roll gap of a hot rolling mill.
Background
At present, in the steel industry, particularly hot rolling manufacturing units, production is organized according to a plan mode of a rolling production unit, and working rolls of a rolling mill need to be replaced according to a rolling period in order to ensure the surface quality and the rolling stability of products. After the working rolls are replaced, the rolling mill needs to perform automatic roll gap calibration again according to the matched roll diameter data, and the rolling mill has basic production conditions after the calibration is completed.
The automatic calibration of the roll gap is a sequence control standard circulation flow, namely theoretical calculation of the roll gap is carried out according to roll diameter data issued by a secondary system, and a calibration process of automatic conditions of a rolling mill is carried out at the same time.
Disclosure of Invention
The invention provides a method for safely calibrating a roll gap of a hot rolling mill, which is used for diagnosing faults during the calibration of the rolling mill, finding and terminating an abnormal calibration process in time and reducing malignant accidents caused by calibration.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for calibrating roll gap safety of a hot rolling mill specifically comprises the following steps:
and sequentially verifying the position of the rolling mill step plate, the elevation data of the rolling mill and the rolling force data of the top and the bottom of the rolling mill, and finishing the calibration of the roll gap of the rolling mill after the verification is passed.
Further, the verification method of the position of the rolling mill step plate specifically comprises the following steps:
after the roll loading of the rolling mill is finished and before the calibration of the rolling mill, the position P of the step plate is detected by using a position sensor arranged in a hydraulic cylinder of the step plateFDetecting the position P of the step plateFWith the set position P of the step plateSComparing, if the detection position P of the step plate isFWith the set position P of the step plateSAnd if the positions of the rolling mill step plates are equal, the verification of the positions of the rolling mill step plates is passed.
Further, the verification method of the rolling mill elevation data comprises the following steps:
the elongation S of the HGC hydraulic cylinder when the HGC hydraulic cylinder is pressed down to the contact between the upper working roll and the lower working roll is calculated through the roll diameter and the matched rolling line elevationZ；
Detecting the screw-down elongation of the HGC hydraulic cylinder in the calibration state of the rolling mill as SgapAnd the rolling mill detects that the rolling force value is Fgap；
If hydraulic pressureCylinder extension Sgap<SZRolling force Fgap<500KN, or the extension S of the hydraulic cylindergap>SZRolling force Fgap>And 500KN, judging that the rolling mill elevation data is qualified in verification.
Further, the verification method of the rolling force data of the top and the bottom of the rolling mill specifically comprises the following steps:
if I | < Fpt-FlcIf not more than 500KN, the rolling force data of the top and the bottom of the rolling mill are verified to be qualified, otherwise, the rolling force data of the top and the bottom of the rolling mill are unqualified;
Fptis the rolling force at the top of the mill, FlcIs the rolling force at the bottom of the mill.
Further, after the verification of the rolling force data of the top and the bottom of the rolling mill, the method further comprises the following steps:
and automatically calibrating the verification of the execution time of each action in the execution process.
Further, the method for verifying the execution time of each action in the automatic calibration execution process specifically includes:
and counting the execution time of each action in the self-calibration execution process, if the execution time of all the actions is lower than the preset execution time of the corresponding action, determining that the execution time of each action in the automatic calibration execution process is qualified, and if the execution time of the actions is higher than the preset execution time of the corresponding action, determining that the execution time of each action in the automatic calibration execution process is unqualified.
The invention provides a rolling mill calibration state detection program designed by a PLC system, which can find artificial or equipment potential problems according to actual conditions and immediately interrupt an automatic roll gap calibration program in the rolling mill calibration process; the method is simple and practical and is easy to realize on site; the potential problem of the calibration of the rolling mill is quickly detected, the basis for diagnosing the equipment fault is provided, the vicious accident caused by the calibration is effectively reduced, the production safety in the industrial field is improved, and therefore the economic benefit is obvious.
Drawings
Fig. 1 is a flowchart of a method for calibrating roll gap safety of a hot rolling mill according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for calibrating roll gap safety of a hot rolling mill according to a second embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The invention provides an automatic detection method for calibrating a safe state, which utilizes the data processing method of the existing rolling mill roll gap calibration PLC system, adopts the action execution process monitoring control on the basis of a calibration sequence control program, combines an inverse calculation method, carries out comparative verification on the correlation between a roll gap position value and a rolling force, simultaneously has an overtime monitoring function for each step process, stops calibration immediately once overtime occurs in the action execution process, can complete all the calibration processes after all the steps are completed, displays the successful calibration, and realizes the calibration accuracy and the process control safety stability.
Fig. 1 is a flowchart of a method for calibrating roll gap safety of a hot rolling mill according to an embodiment of the present invention, where the method specifically includes:
and sequentially verifying the position of the rolling mill step plate, the elevation data of the rolling mill and the rolling force data of the top and the bottom of the rolling mill, finishing the calibration of the roll gap of the rolling mill after the verification is passed, and otherwise, determining that the calibration of the roll gap of the rolling mill is abnormal and terminating the calibration.
In the embodiment of the invention, the verification method of the position of the step plate of the rolling mill specifically comprises the following steps:
after the roll loading of the rolling mill is finished and before the calibration of the rolling mill, the position P of the step plate is detected by using a position sensor arranged in a hydraulic cylinder of the step plateFDetecting the position P of the step plateFWith the set position P of the step plateSComparing, if the detection position P of the step plate isFWith the set position P of the step plateSIf the positions of the rolling mill step plates are equal to each other, the verification of the positions of the rolling mill step plates is passed, otherwise, the verification of the positions of the rolling mill step plates is not passed, and the positions P of the step plates areSThe calculation output of the secondary system is realized, so that the problem of position deviation of the step plate possibly caused by human or equipment in the roll loading process is solved.
In the embodiment of the invention, the verification method of the rolling mill elevation data comprises the following steps:
the elongation S of the HGC hydraulic cylinder when the HGC hydraulic cylinder is pressed down to the contact between the upper working roll and the lower working roll is calculated through the roll diameter and the matched rolling line elevationZ；
In the embodiment of the invention, the HGC hydraulic cylinder is positioned above the upper working roll, the HGC hydraulic cylinder drives the upper working roll to press downwards until the upper working roll is contacted with the lower working roll, and the elongation S of the HGC hydraulic cylinder is obtained based on the existing calculation methodZ。
Detecting the screw-down elongation of the HGC hydraulic cylinder in the calibration state of the rolling mill as SgapAnd the rolling mill detects that the rolling force value is Fgap；
If the hydraulic cylinder extends by the amount Sgap<SZRolling force Fgap<500KN, or the extension S of the hydraulic cylindergap>SZRolling force Fgap>And 500KN, judging that the rolling mill elevation data is qualified in verification, and otherwise, judging that the rolling mill elevation data is unqualified in verification.
According to normal conditions, the theoretical value of the extension amount of the HGC hydraulic cylinder is matched with the actual condition, and the extension amount S of the HGC hydraulic cylinder is usedgapWith rolling force FgapAs a key point for measuring the monitoring of the calibration state, in the automatic calibration process, after the rolling force of the rolling mill rolling force detection sensor is reset, the elongation S of the HGC hydraulic cylinder is kept when the HGC hydraulic cylinder is pressed downgapRolling force F of rolling millgapMonitoring, at cylinder extension Sgap<SZRolling force Fgap<500KN, or the extension S of the hydraulic cylindergap>SZRolling force Fgap>And when 500KN is used, judging that the rolling mill elevation data is qualified for verification, otherwise, judging that the rolling mill elevation data is unqualified for verification.
In the embodiment of the invention, the verification method of the rolling force data of the top and the bottom of the rolling mill is specifically as follows:
an oil pressure sensor is arranged on a HGC hydraulic cylinder at the top of the frame inside the rolling mill and is used for detecting the rolling force F at the top of the rolling millptThe bottom of the rolling mill is provided with a pressure strain gauge (the bottom of a lower working roll) for detecting the rolling force F at the bottom of the rolling milllcThe effective equivalence of the rolling force detected by the two sensors can meet the requirement that when a certain sensor has a fault of the detection sensor or the elevation of the rolling line in the rolling mill is abnormal, the rolling force is detected to carry out deviation comparison calculation, and the guaranteed value is I Fpt-FlcAnd if not, verifying the rolling force data of the top and the bottom of the rolling mill to be qualified, otherwise, determining the rolling force data of the top and the bottom of the rolling mill to be unqualified.
Fig. 2 is a flowchart of a method for calibrating roll gap safety of a hot rolling mill according to a second embodiment of the present invention, where the method for calibrating roll gap safety of a hot rolling mill specifically includes:
and sequentially verifying the position of the rolling mill step plate, the elevation data of the rolling mill, the rolling force data of the top and the bottom of the rolling mill and the execution time of each action in the automatic calibration execution process, finishing the calibration of the roll gap of the rolling mill after the four verifications are passed, and otherwise, determining that the calibration of the roll gap of the rolling mill is abnormal and terminating the calibration.
The verification method for the position of the rolling mill step plate, the verification method for the rolling mill elevation data, and the verification method for the rolling force data at the top and the bottom of the rolling mill used in the second embodiment are the same as the verification method for the position of the rolling mill step plate, the verification method for the rolling mill elevation data, and the verification method for the rolling force data at the top and the bottom of the rolling mill used in the first embodiment, and are not repeated herein.
In the embodiment of the present invention, the method for verifying the execution time of each action in the automatic calibration execution process specifically includes:
and counting the execution time of each action in the self-calibration execution process, if the execution time of all the actions is lower than the preset execution time of the corresponding action, determining that the execution time of each action in the automatic calibration execution process is qualified through verification, and if the execution time of all the actions is higher than the preset execution time of the corresponding action, determining that the execution time of each action in the automatic calibration execution process is unqualified through verification, thereby realizing overtime monitoring alarm of each step.
In the embodiment of the invention, when the calibration program is terminated, the roll diameter data of the roll is re-verified, and the contact surface between the support roll and the working roll inside the frame, the position condition of the step plate mechanical equipment and the like are detected on site.
According to observation data from practice, in automatic calibration control, when a pressing action roller is contacted, the deviation amount between a theoretical calculation value and an actual value of a rolling mill roll gap can be ignored, according to a formulated relation value between rolling force and HGC hydraulic cylinder elongation, the accuracy of the safety calibration detection of the rolling mill can be effectively realized, and meanwhile, the running state of equipment in a rack is monitored, so that a powerful basis is provided for equipment guarantee and maintenance;
the detection and fault diagnosis of the calibration process of the rolling mill can be timely carried out in the automatic calibration process of the rolling mill, the automatic calibration system of the rolling mill is supplemented and improved, the calibration running state and the self characteristics of the rolling mill can be more comprehensively detected, the fault source can be rapidly judged, on the basis, a corresponding safe calibration state detection method is added for reference in the automatic calibration process of other equipment of a hot rolling production line, and reference is provided for equipment use and maintenance personnel.
According to the invention, through a rolling mill calibration state detection program designed by a PLC system, in the rolling mill calibration process, the potential problems of human or equipment can be found according to the actual situation, and the automatic roll gap calibration program is immediately interrupted; the method is simple and practical and is easy to realize on site; the potential problem of the calibration of the rolling mill is quickly detected, the basis for diagnosing the equipment fault is provided, the vicious accident caused by the calibration is effectively reduced, the production safety in the industrial field is improved, and therefore the economic benefit is obvious.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (6)
1. The method for safely calibrating the roll gap of the hot rolling mill is characterized by comprising the following steps of:
and sequentially verifying the position of the rolling mill step plate, the elevation data of the rolling mill and the rolling force data of the top and the bottom of the rolling mill, and finishing the calibration of the roll gap of the rolling mill after the verification is passed.
2. The method for calibrating the roll gap safety of the hot rolling mill according to claim 1, wherein the verification method of the position of the step plate of the rolling mill is as follows:
after the roll loading of the rolling mill is finished and before the calibration of the rolling mill, the position P of the step plate is detected by using a position sensor arranged in a hydraulic cylinder of the step plateFDetecting the position P of the step plateFWith the set position P of the step plateSComparing, if the detection position P of the step plate isFWith the set position P of the step plateSAnd if the positions of the rolling mill step plates are equal, the verification of the positions of the rolling mill step plates is passed.
3. The method for calibrating the roll gap safety of the hot rolling mill according to claim 1, wherein the verification method of the elevation data of the rolling mill comprises the following steps:
the elongation S of the HGC hydraulic cylinder when the HGC hydraulic cylinder is pressed down to the contact between the upper working roll and the lower working roll is calculated through the roll diameter and the matched rolling line elevationZ；
Detecting the screw-down elongation of the HGC hydraulic cylinder in the calibration state of the rolling mill as SgapAnd the rolling mill detects that the rolling force value is Fgap；
If the hydraulic cylinder extends by the amount Sgap<SZRolling force Fgap<500KN, or the extension S of the hydraulic cylindergap>SZRolling force Fgap>And 500KN, judging that the rolling mill elevation data is qualified in verification.
4. The method for calibrating the roll gap safety of the hot rolling mill as claimed in claim 1, wherein the verification method of the rolling force data of the top and the bottom of the mill is as follows:
if I | < Fpt-FlcIf not more than 500KN, the rolling force data of the top and the bottom of the rolling mill are verified to be qualified, otherwise, the rolling force data of the top and the bottom of the rolling mill are unqualified;
Fptis the rolling force at the top of the mill, FlcIs the rolling force at the bottom of the mill.
5. The method for calibrating the roll gap safety of a hot rolling mill as claimed in claim 1, further comprising after verifying the rolling force data at the top and bottom of the mill:
and automatically calibrating the verification of the execution time of each action in the execution process.
6. The method for calibrating the roll gap safety of the hot rolling mill according to claim 5, wherein the method for verifying the execution time of each action in the automatic calibration execution process is as follows:
and counting the execution time of each action in the self-calibration execution process, if the execution time of all the actions is lower than the preset execution time of the corresponding action, determining that the execution time of each action in the automatic calibration execution process is qualified, and if the execution time of the actions is higher than the preset execution time of the corresponding action, determining that the execution time of each action in the automatic calibration execution process is unqualified.
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| CN202010940814.9A CN112170508B (en) | 2020-09-09 | 2020-09-09 | Method for safely calibrating roll gap of hot rolling mill |
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| CN202010940814.9A CN112170508B (en) | 2020-09-09 | 2020-09-09 | Method for safely calibrating roll gap of hot rolling mill |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1192732A (en) * | 1966-08-31 | 1970-05-20 | Rose Downs & Thompson Ltd | Roll Gap Control |
| DE10003126A1 (en) * | 1999-10-17 | 2001-04-26 | Karl Fuhr Gmbh & Co Kg | Rolling device for rolling metal rods or wires has a housing with star-shaped rollers, a drive unit for operating the rollers and a coupling unit for transferring the torque produced by the drive unit to the rollers |
| CN101091967A (en) * | 2007-08-07 | 2007-12-26 | 攀枝花新钢钒股份有限公司 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
| CN101318202A (en) * | 2008-06-26 | 2008-12-10 | 湖南华菱涟源钢铁有限公司 | Zero positioning method for roller gap of stand-alone frame of roller mill |
| CN106269904A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of scaling method of mill roll-gap |
-
2020
- 2020-09-09 CN CN202010940814.9A patent/CN112170508B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1192732A (en) * | 1966-08-31 | 1970-05-20 | Rose Downs & Thompson Ltd | Roll Gap Control |
| DE10003126A1 (en) * | 1999-10-17 | 2001-04-26 | Karl Fuhr Gmbh & Co Kg | Rolling device for rolling metal rods or wires has a housing with star-shaped rollers, a drive unit for operating the rollers and a coupling unit for transferring the torque produced by the drive unit to the rollers |
| CN101091967A (en) * | 2007-08-07 | 2007-12-26 | 攀枝花新钢钒股份有限公司 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
| CN101318202A (en) * | 2008-06-26 | 2008-12-10 | 湖南华菱涟源钢铁有限公司 | Zero positioning method for roller gap of stand-alone frame of roller mill |
| CN106269904A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of scaling method of mill roll-gap |
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| CN112170508B (en) | 2022-05-17 |
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