CN115283451B - Method for improving precision of pinch roll of hot rolling coiling machine - Google Patents
Method for improving precision of pinch roll of hot rolling coiling machine Download PDFInfo
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- CN115283451B CN115283451B CN202211052359.4A CN202211052359A CN115283451B CN 115283451 B CN115283451 B CN 115283451B CN 202211052359 A CN202211052359 A CN 202211052359A CN 115283451 B CN115283451 B CN 115283451B
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- pinch roll
- calibration
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- prp
- pressure
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005098 hot rolling Methods 0.000 title claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
- 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
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/006—Pinch roll sets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
The invention relates to a method for improving the precision of pinch rolls of a hot rolling coiling machine, which comprises the steps of setting the roll gap value between an upper pinch roll and a lower pinch roll to be 200-400 mm; the upper pinch roll starts to descend at the speed of 107-123 mm/sec, and when the distance between the upper pinch roll and the lower pinch roll is 2-3 mm, the pinch roll descends at the speed of 0.5-0.7 mm/sec until the rolling force is 5-7 kN; the multi-stage calibration is adopted on the basis of the basic calibration method. The invention effectively solves the problem of poor control precision of the pinch roll, carries out multistage calibration treatment on the pinch roll, and adjusts the calibration value from the original system fixed value to multi-parameter value calibration.
Description
Technical Field
The invention belongs to the field of strip steel production, and particularly relates to a method for improving the precision of a pinch roll of a hot rolling coiling machine.
Background
The pinch roll is always in contact with the strip steel in the whole coiling process, and the whole process participates in the tension building and tension losing processes. If the precision of the pinch roll is poor, the strip steel deflection is increased, and the problems of head tower shape, tail overflow and poor coiling are easily generated on the premise that the pinch roll of the coiling machine deflects and the coiling speed and the tension are not adjusted sufficiently; for the problem of deviation in the coiling process caused by poor shape of finish rolling incoming materials or poor centering of side guide plates, the pinch roll is unstable in deviation in the coiled steel state, and the defects of coil shape and edge wave breaking are extremely easy to form; the eccentric wear condition of the tension roller is obvious after the roller shape of the tension roller of the lower machine is measured.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for improving the precision of a pinch roll of a hot rolling coiling machine, improve a calibration mode and improve the precision of the pinch roll of the coiling machine.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
A method for improving the precision of pinch rolls of a hot rolling coiling machine comprises the following steps:
1) Basic calibration:
① The roll gap value between the upper pinch roll and the lower pinch roll is 200-400 mm;
② The upper pinch roll starts to descend at a speed of 107-123 mm/sec, and the pinch roll descends at a speed of 0.5-0.7 mm/sec when the distance between the upper pinch roll and the lower pinch roll is 2-3 mm;
③ The upper roller and the lower roller are in contact with each other in theory, and the pinch roller descends until the rolling force is 5-7 kN;
④ Performing pressure leaning detection, and clicking calibration after pressure deviation is adjusted;
⑤ Lifting the roll gap, and ending the whole basic calibration process;
2) After basic calibration, multi-section calibration is adopted:
PRp≈f(s)＝A-B (1)
In formula (1), PRp: pinch roll pressure, kN; f(s): the roll gap change function value is mm; b is layer setting parameters, mm; a is the basic roll gap parameter of the coiling machine, and mm;
And (3) performing multi-stage calibration according to the formula (1).
The multi-section calibration comprises:
1) Start 1 segment calibration mode
PRp(100)≈f(s)-f(s1) (2)
In formula (2), PRp (100): the pinch roll pressure is 100-110 kN; f (s 1): roll gap variation when rolling force fluctuates by 100kN, mm;
2) Start 2-segment calibration mode
PRp(200)≈f(s)-f(s2) (3)
In formula (3), PRp (200): the pinch roll pressure is 200-220 kN; f (s 2): roll gap variation amount when 200kN rolling force fluctuates is mm;
3) Starting 3-section calibration mode
PRp(300)≈f(s)-f(s3) (4)
In formula (4), PRp (300): the pinch roll pressure is 300-320 kN; f (s 3): the roll gap variation in 300kN rolling force fluctuation is mm.
Compared with the prior art, the invention has the beneficial effects that:
The method effectively solves the problem of poor control precision of the pinch roll, carries out diversified calibration treatment on the pinch roll, and adjusts the calibration value from the original system fixed value to multi-section parameter value calibration.
The method is studied in the aspects of calibrating a pinch roll, adjusting the position balance of the pinch roll and the like in the advancing process of the coiling adjustment technology, and mainly solves the following calibration technical problems: the three-section calibration method technology of the pinch roll of the coiling machine is initiated, and the problem of poor control precision of the pinch roll is effectively solved. The method is influenced by the equipment precision and the process parameter changes, so that the strip steel can shake greatly in the process of no tension establishment at the head part and no tension loss at the tail part of the strip steel during finish rolling and throwing of the strip steel before entering a coiling machine, and the occurrence rate of tower-shaped and edge overflow defects is high when the swing amplitude is large. Therefore, the adjustment control of the coiling machine is improved by improving the calibration mode and matching with the adjustment method and improving the guide rule control mode.
Detailed Description
The present invention will be described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A method for improving the precision of a pinch roll of a hot rolling coiling machine comprises the steps of calibrating the pinch roll, adjusting a calibration value from an original system set value to an operation experience value, calibrating the pinch roll by adopting a first-stage calibration method under 100kN pressure, calibrating the pinch roll by adopting a second-stage calibration method under 200kN pressure and calibrating the pinch roll by adopting a third-stage calibration method under 300kN pressure, and is shown in a table 1.
Table 1: three-section standard pressure copper bar data statistics of pinch rolls of 1-3# coiling machine
The upper pinch roll is lifted through when the deviation is <3 kN. Through the implementation of the three-section calibration method, the difficult problem of inaccurate zero drift of the pinch roll is better solved, the hard characteristic is increased, the calculated roll gap value of the pinch roll is more accurate, the control precision of the pinch roll is improved, the compression degree of the pinch roll is improved, the pinch roll is more tightly attached to a steel plate, the vibration of the steel plate is reduced, and the rolling precision is improved.
1) Basic calibration:
① The roll gap between the upper pinch roll and the lower pinch roll has a value of 200-400 mm, preferably 300 + -20 mm, so that the pinch roll has a sufficient stroke;
② The upper pinch roll starts to descend at a speed of 107-123 mm/sec, and the pinch roll descends at a speed of 0.5-0.7 mm/sec when the distance between the upper pinch roll and the lower pinch roll is 2-3 mm;
③ The upper roller and the lower roller are in contact with each other in theory, and the pinch roller descends until the rolling force is 5-7 kN;
④ Performing pressure leaning detection, and clicking calibration after pressure deviation is adjusted;
⑤ Lifting the roll gap, and ending the whole basic calibration process;
2) The multi-section calibration is adopted on the basis of the basic calibration method
PRp≈f(s)＝A-B (1)
In formula (1), PRp: pinch roll pressure, kN; f(s): the roll gap change function value is mm; b is layer setting parameters, mm; a is the basic roll gap parameter of the coiling machine, and mm; obtaining layer setting parameters: when the pressure sensor detects that the pressure reaches a set value, a displacement sensor in the hydraulic cylinder feeds back a roll gap value. The pressure sensor is arranged below the lower pinch roll base and is used for detecting contact pressure between the 2 pinch rolls; the hydraulic cylinder is arranged on the housing, drives the pinch roll to move up and down, and the displacement sensor in the hydraulic cylinder can directly detect the movement displacement of the piston, so that the roll gap value is fed back.
Performing multiple calibration according to the formula (1):
① Starting 1-time calibration mode
PRp(100)≈f(s)-f(s1) (2)
In formula (2), PRp (100): the pinch roll has a pressure of 100-110 kN (the upper pinch roll descends and stops when the rolling pressure reaches 100+/-10 kN; f (s 1) =f_ cPRGap _k21: the roll gap variation when the rolling force is 100+/-10 kN, namely the roll gap variation when the rolling force is 100kN and fluctuates, and the thickness is mm; and meanwhile, the roll gap is subjected to deflection adjustment, and when the empty load pressure value is less than or equal to 3 kN+/-15%, the calibration is passed.
② Starting 2 times of calibration mode
PRp(200)≈f(s)-f(s2) (3)
In formula (3), PRp (200): the pinch rolls have a pressure of 200-220 kN (the upper pinch roll descends and stops when the rolling pressure is displayed to reach 200+ -10 kN); f (s 2) =f_ cPRGap _k22: the roll gap variation when the rolling force is 200+/-10 kN, namely the roll gap variation when the rolling force is 200kN and fluctuates is mm; and meanwhile, the roll gap is subjected to deflection adjustment, and when the empty load pressure value is less than or equal to 6 kN+/-15%, the calibration is passed.
③ Starting 3 times of calibration mode
PRp(300)≈f(s)-f(s3) (4)
In formula (4), PRp (300): the pinch rolls have a pressure of 300-320 kN (the upper pinch roll is lowered and stopped when the rolling pressure is shown to reach 300+ -10 kN); f (s 3) =f_ cPRGap _k23: roll gap variation at 300+ -10 kN, i.e. roll gap variation at 300kN fluctuation, mm: and meanwhile, the roll gap is subjected to deflection adjustment, and when the empty load pressure value is less than or equal to 10 kN+/-15%, the calibration is passed.
The method improves the calibration method of the pinch roll gap of the coiling machine, adjusts the position balance of the pinch roll, and effectively solves the problem that the pressure on two sides of the pinch roll is unbalanced, and the fluctuation of the roll gap causes obvious deviation of strip steel: the numerical deviation obtained by measuring the roller shape of the pinch roller of the lower machine and the gaps of the tension roller window and the bearing box at regular intervals according to the deviation state of the strip steel is used as a reference basis for adjustment, and is shown in tables 2 and 3.
Table 2: gap between bearing box and slide plate in static state
| WS south side gap | WS North side gap | WS side gap | DS south side clearance | DS North side gap | DS side gap | |
| 1#DC | 0.85mm | 0.1mm | 0.95mm | 0.9mm | 0.15mm | 1.05mm |
| 2#DC | 1.15mm | 0.15mm | 1.3mm | 1.15mm | 0.18mm | 1.33mm |
| 3#DC | 0.6mm | 0.1mm | 0.7mm | 0.8mm | 0.18mm | 0.98mm |
Table 3: pinch roll window gap
And dynamically adjusting according to the roll gap pressure deviation value of the pinch roll and the deviation value of the roll, wherein the adjustment value is 10-20%.
Claims (1)
1. The method for improving the precision of the pinch roll of the hot rolling coiling machine is characterized by comprising the following steps of:
1) Basic calibration:
① The roll gap value between the upper pinch roll and the lower pinch roll is 200-400 mm;
② The upper pinch roll starts to descend at a speed of 107-123 mm/sec, and the pinch roll descends at a speed of 0.5-0.7 mm/sec when the distance between the upper pinch roll and the lower pinch roll is 2-3 mm;
③ The upper roller and the lower roller are in contact with each other in theory, and the pinch roller descends until the rolling force is 5-7 kN;
④ Performing pressure leaning detection, and clicking calibration after pressure deviation is adjusted;
⑤ Lifting the roll gap, and ending the whole basic calibration process;
2) After basic calibration, multi-section calibration is adopted:
PRp≈f(s)=A-B （1）
in formula (1), PRp: pinch roll pressure, kN; f(s): the roll gap change function value is mm; b is layer setting parameters, mm; a is the basic roll gap parameter of the coiling machine, and mm;
performing multistage calibration according to the formula (1);
the multi-section type calibration comprises the following steps:
1) Start 1 segment calibration mode
PRp（100）≈f(s) -f(s1) （2）
In formula (2), PRp (100): the pinch roll pressure is 100-110 kN; f (s 1): roll gap variation when rolling force fluctuates by 100kN, mm;
2) Start 2-segment calibration mode
PRp（200）≈f(s) -f(s2) （3）
In formula (3), PRp (200): the pinch roll pressure is 200-220 kN; f (s 2): roll gap variation amount when 200kN rolling force fluctuates is mm;
3) Starting 3-section calibration mode
PRp（300）≈f(s) -f(s3) （4）
In formula (4), PRp (300): the pinch roll pressure is 300-320 kN; f (s 3): the roll gap variation in 300kN rolling force fluctuation is mm.
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| CN115283451B true CN115283451B (en) | 2024-05-14 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11319942A (en) * | 1998-05-15 | 1999-11-24 | Kawasaki Steel Corp | Method for cutting metal strip in hot rolling |
| CN101439366A (en) * | 2008-12-25 | 2009-05-27 | 山西太钢不锈钢股份有限公司 | Method for coiling hot continuous rolling high-intensity medium plate |
| CN102039330A (en) * | 2010-10-16 | 2011-05-04 | 山西太钢不锈钢股份有限公司 | Parameter setting method of hot continuous rolling thin slab coiling device and coiling method of hot continuous rolling thin slab |
| CN102581067A (en) * | 2011-01-06 | 2012-07-18 | 宝山钢铁股份有限公司 | Hot-rolled coiler pinch roll controlling method |
| CN103203374A (en) * | 2013-04-19 | 2013-07-17 | 首钢京唐钢铁联合有限责任公司 | Calibration method for pinch roll of hot rolling coiler |
| CN108372205A (en) * | 2018-02-27 | 2018-08-07 | 山东钢铁股份有限公司 | A kind of hot-strip reels pinch roller crosses Discrete control method during steel |
| CN108817089A (en) * | 2018-04-28 | 2018-11-16 | 江苏省沙钢钢铁研究院有限公司 | Control method for hot rolling thin-specification strip steel coil |
| CN111451291A (en) * | 2020-04-08 | 2020-07-28 | 鞍钢股份有限公司 | Method for improving coil shape quality of hot-rolled strip steel |
-
2022
- 2022-08-31 CN CN202211052359.4A patent/CN115283451B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11319942A (en) * | 1998-05-15 | 1999-11-24 | Kawasaki Steel Corp | Method for cutting metal strip in hot rolling |
| CN101439366A (en) * | 2008-12-25 | 2009-05-27 | 山西太钢不锈钢股份有限公司 | Method for coiling hot continuous rolling high-intensity medium plate |
| CN102039330A (en) * | 2010-10-16 | 2011-05-04 | 山西太钢不锈钢股份有限公司 | Parameter setting method of hot continuous rolling thin slab coiling device and coiling method of hot continuous rolling thin slab |
| CN102581067A (en) * | 2011-01-06 | 2012-07-18 | 宝山钢铁股份有限公司 | Hot-rolled coiler pinch roll controlling method |
| CN103203374A (en) * | 2013-04-19 | 2013-07-17 | 首钢京唐钢铁联合有限责任公司 | Calibration method for pinch roll of hot rolling coiler |
| CN108372205A (en) * | 2018-02-27 | 2018-08-07 | 山东钢铁股份有限公司 | A kind of hot-strip reels pinch roller crosses Discrete control method during steel |
| CN108817089A (en) * | 2018-04-28 | 2018-11-16 | 江苏省沙钢钢铁研究院有限公司 | Control method for hot rolling thin-specification strip steel coil |
| CN111451291A (en) * | 2020-04-08 | 2020-07-28 | 鞍钢股份有限公司 | Method for improving coil shape quality of hot-rolled strip steel |
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