CN113523022A - Solution method for warping buckle head of rolled piece with thickness of more than 18mm of medium plate straightener - Google Patents
Solution method for warping buckle head of rolled piece with thickness of more than 18mm of medium plate straightener Download PDFInfo
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- CN113523022A CN113523022A CN202110670166.4A CN202110670166A CN113523022A CN 113523022 A CN113523022 A CN 113523022A CN 202110670166 A CN202110670166 A CN 202110670166A CN 113523022 A CN113523022 A CN 113523022A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000005096 rolling process Methods 0.000 abstract description 11
- 238000007373 indentation Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000010485 coping Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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Abstract
The invention discloses a method for solving the warping and buckling head of a rolled piece with the diameter being more than 18mm of a medium plate straightening machine, which relates to the technical field of steel production, achieves the control aim of the warping and buckling head of the rolled piece with the diameter being more than 18mm by reasonably improving a straightening process according to the structure of production equipment, has strong operability of an improved straightening scheme through production demonstration, achieves the requirement of a customer order on the control effect of the warping and buckling head of the rolled piece, and solves the problems that the straightening effect of the warping and buckling head of the head is not ideal and the subsequent rescue cost is large. Compared with a conventional straightening mode, the straightening machine can effectively straighten the abnormal head part produced in the previous process (rolling mill), reduce the collision and damage to the straightening roll and the subsequent equipment of the straightening machine due to the raised buckle head of the rolled piece, and reduce the occurrence probability of indentation of the straightening machine, equipment halt and defect coping of the straightening roll.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a solution for a rolled piece buckle head with the thickness of more than 18mm of a medium plate straightener.
Background
In the production process of the medium plate, after rolling of a rolling mill is finished, the plate blank is sheared and segmented by a flying shear, passes through a laminar cooling area and then reaches a straightener area, and the head rolling force is increased due to the fact that the head temperature is excessively reduced in the rolling process and the rolling deformation resistance is increased. In order to ensure that the thickness change of the rolled piece in the length direction is within the process requirement range, the roll gap is controlled by a first-level program to have a compensation deviation when the head is rolled, namely the roll gap of the rolling mill is smaller than the roll gap of the body when the head is bitten, the deformation resistance of the head of the rolled piece is increased, so that the head of the rolled piece is warped or buckled, and the strength of the head warped and buckled part of the head is much higher than that of the body after laminar cooling. Rolled pieces below 18mm can be straightened by a straightening machine automatically at one time, the impact load of the head on the roll surface of the straightening roll is relatively small, and the probability of generating indentation of the straightening roll and equipment damage is low. The impact force of the head warping buckle of the high-temperature-control rolled piece with the diameter of more than 18mm on the straightening roll surface is high, the probability of straightening roll indentation, roll surface tumors, straightening roll falling and the like is high, the straightening roll indentation needs to be polished one to three times in one production shift (8 hours), the time of each impact is about 12 minutes, the production rhythm of a rolling line is greatly influenced, surface quality defects such as straightening roll indentation, buckling, indentation and the like are generated, the rescue cost of a subsequent process is increased, the re-production cost of a compensation order is increased, even waste products cannot be saved, and losses are brought to enterprises.
The aforementioned buckling is divided into several types: buckling the head of the rolled piece, buckling the rolled piece in a wave shape without flattening, buckling the rolled piece in the width direction or buckling the rolled piece in a pot bottom shape, and buckling the rolled piece in the length direction or buckling the rolled piece in a pot bottom shape. Wherein the thick plate with the thickness of more than 18mm is buckled, and most of the thick plates are buckled with the head warping buckling head and are arched in the width direction of the rolled piece or are buckled in a pot bottom shape. In contrast, buckling of the head warping buckle is a difficult problem which puzzles the production of the medium plate.
In the prior art, a production line of a hot rolled steel plate mostly adopts a full-automatic one-step forming and straightening mode of a straightening machine to straighten a rolled piece, namely, the rolled piece flows out of a layer of flow and is straightened by a preset straightening machine roll gap to reach a next procedure. The straightening effect of the head warping and buckling head is not ideal, the subsequent rescue cost is high, and the contract redemption and the market competitiveness of the product are influenced.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a method for solving the buckling head of a rolled piece with the thickness of more than 18mm of a medium plate straightener, which comprises the following steps:
s1, rapidly opening the roll gap of the straightening machine to the maximum before the rolled piece reaches the straightening machine;
s2, leading the head of the rolled piece to pass through the roller gap of the straightener from the center to the rear of the straightener;
s3, after the head of the rolled piece passes through the straightener, the straightener and the roller bed are manually stopped;
s4, setting a roll gap according to the target thickness of a rolled piece, keeping the height of an inlet side roll unchanged, setting the height of an outlet side roll to be a numerical value according to the buckle head condition of the plate head, and sending straightening data again after setting;
s5, after the roll gap is in place, starting a straightening machine and a roller way, reversely straightening the rolled piece until the rolled piece is in front of the straightening machine, and finishing primary pre-straightening, wherein the head of the rolled piece is relatively flat at the moment;
s6, setting the straightening rollers according to normal straightening parameters, and retransmitting straightening data after setting;
and S7, straightening the rolled piece from the front of the machine to the back of the machine after the roll gap is in place, and finishing the straightening of the rolled piece.
The technical scheme of the invention is further defined as follows:
s8, if the straightening head needs to be strengthened, the head of the rolled piece is straightened in the straightening machine repeatedly in the steps S7 once.
In the method for solving the buckling head warping of the rolled piece with the thickness of more than 18mm of the medium plate straightener, the medium plate with the thickness of 18-25 mm is executed to the step S7, and the medium plate with the thickness of more than 25mm is executed to the step S8.
In the method for solving the buckling head of the rolled piece with the diameter of more than 18mm of the medium plate straightener, in the step S4, the height of an inlet side roller is 0, the height of the buckling head is set to be-2 to-5, the buckling head is set to be +2 to +5, a straightening force single cylinder is 0.5Mbar, and the total number of the four cylinders is four.
In the method for solving the buckling head of the rolled piece with the thickness of more than 18mm of the medium plate straightener, in the step S6, an inlet roll gap is smaller than the target thickness of the rolled piece by 0.80mm, an outlet roll gap is smaller than the target thickness of the rolled piece by 0.60mm, and a single straightening force cylinder is 1.0-1.5 Mbar.
According to the method for solving the buckling head warping of the rolled piece with the length being more than 18mm of the medium plate straightener, the head is straightened at a low speed of 0.5m/s, and the body can freely select the high speed and the low speed.
In the method for solving the buckling head warping of the rolled piece with the thickness of more than 18mm of the medium plate straightener, the adjusting range of the edge roller of the straightener is +/-10 mm, and 0 position is horizontal to the upper roller surface of the lower straightener roller, namely the working reference surface.
According to the method for solving the buckling head warping of the rolled piece with the diameter of more than 18mm of the medium plate straightener, the single-cylinder force adjustment range of the straightening force is 0-2.5 Mbar.
In the method for solving the buckling head of the rolled piece with the thickness of more than 18mm of the medium plate straightener, the process parameters are set in advance in the steps S4 and S6, and the height position of the edge roller is only required to be modified in the straightening process.
The invention has the beneficial effects that:
(1) according to the self structure of the production equipment, the straightening process is reasonably improved, the purpose of controlling the warping and buckling head of the rolled piece with the diameter of more than 18mm is achieved, through production demonstration, the improved straightening scheme has strong operability, the control effect on the warping and buckling head of the rolled piece meets the requirement of a customer order, and the problems that the straightening effect of the warping and buckling head of the head is not ideal and the subsequent rescue cost is high are solved;
(2) compared with a conventional straightening mode, the straightening device can effectively straighten the abnormal head part produced in the previous process (rolling mill), reduce the collision and damage to the straightening roller and the subsequent equipment of the straightening machine due to the buckle head of the rolled piece, and reduce the probability of the indentation of the straightening machine, the shutdown of the equipment and the defect coping of the straightening roller;
(3) the invention greatly improves the production efficiency of equipment and powerfully ensures the final surface quality, the first-time qualification rate and the contract exchange rate of rolled pieces.
Drawings
FIG. 1 is a schematic view showing the basic structure of a leveler;
FIG. 2 shows the head warping of the rolled piece before straightening by the straightener;
FIG. 3 is the situation of the head of a rolled piece after being straightened by the straightener;
wherein: 1. rolling pieces; 2. an upper roller box; 3. a lower roll box; 4. a pressure oil cylinder; 5. a frame; 61. an inlet edge roller; 62. an outlet edge roller; 7. a roller way.
Detailed Description
The solution for straightening the buckling head of a rolled piece with a diameter of more than 18mm in the medium-thick plate straightener provided by the embodiment takes straightening a 20mm warping head plate as an example.
As shown in figure 1, the straightening head part adopts low-speed straightening of 0.5m/s, the rolled piece is cooled by laminar flow after being taken out of a rolling mill, as shown in figure 2, the rolled piece 1 is conveyed to the front of a straightening machine by a roller way 7, and a roller gap 'fast open' of the straightening machine is opened to the maximum (220 mm) before the rolled piece 1 reaches the straightening machine; the head of the rolled piece 1 passes through the straightener from the hollow roll gap of the straightener; after the head of the rolled piece 1 passes through the straightener, the straightener and the roller way 7 are manually stopped; setting a roll gap (20.00) according to the target thickness of a rolled piece 1, keeping the height of an inlet side roll 61 unchanged (0 bit), setting a numerical value (the head is set to be-3) according to the head raising condition of an outlet side roll 62, setting a single cylinder of a pressure oil cylinder 4 by 0.5Mbar (four cylinders in total), and retransmitting straightening data after setting; after the roll gap is in place, starting a straightening machine and a roller way 7, reversely straightening the rolled piece 1 to the front of the machine, finishing primary pre-straightening, and relatively flattening the head of the rolled piece at the moment; setting the straightening roller according to normal straightening parameters: the inlet roll gap is 0.80mm (19.20) smaller than the target thickness of the rolled piece 1, the outlet roll gap is 0.6mm (19.40) smaller than the target thickness of the rolled piece 1, and the single cylinder of the pressure oil cylinder 4 is 1.0Mbar, and the straightening data is sent again after the setting is finished; and after the roll gap is in place, straightening the rolled piece 1 from the front of the machine to the back of the machine, and finishing the straightening of the rolled piece, as shown in figure 3.
According to the structure of production equipment, the straightening process is reasonably improved, the purpose of controlling the warping and buckling head of the rolled piece with the diameter of more than 18mm is achieved, production demonstration shows that the improved straightening scheme is strong in operability, the control effect on the warping and buckling head of the rolled piece meets the requirement of a customer order, and the problems in the prior art are solved.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (9)
1. A method for solving the problem of warping and buckling of a rolled piece with a thickness of more than 18mm of a medium plate straightener is characterized by comprising the following steps: the method comprises the following steps:
s1, rapidly opening the roll gap of the straightening machine to the maximum before the rolled piece reaches the straightening machine;
s2, leading the head of the rolled piece to pass through the roller gap of the straightener from the center to the rear of the straightener;
s3, after the head of the rolled piece passes through the straightener, the straightener and the roller bed are manually stopped;
s4, setting a roll gap according to the target thickness of a rolled piece, keeping the height of an inlet side roll unchanged, setting the height of an outlet side roll to be a numerical value according to the buckle head condition of the plate head, and sending straightening data again after setting;
s5, after the roll gap is in place, starting a straightening machine and a roller way, reversely straightening the rolled piece until the rolled piece is in front of the straightening machine, and finishing primary pre-straightening, wherein the head of the rolled piece is relatively flat at the moment;
s6, setting the straightening rollers according to normal straightening parameters, and retransmitting straightening data after setting;
and S7, straightening the rolled piece from the front of the machine to the back of the machine after the roll gap is in place, and finishing the straightening of the rolled piece.
2. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: s8, if the straightening head needs to be strengthened, the head of the rolled piece is repeatedly straightened in the straightening machine for once according to the step S7.
3. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 2 is characterized in that: the 18-25 mm medium plate is processed to step S7, and the medium plate with the thickness of more than 25mm is processed to step S8.
4. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: in step S4, the inlet side roller has a height of 0, a head warping is set to be-2 to-5, a head buckling is set to be +2 to +5, a straightening force single cylinder is 0.5Mbar, and the four cylinders are total.
5. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: in step S6, the inlet roll gap is 0.80mm smaller than the target thickness of the rolled piece, the outlet roll gap is 0.60mm smaller than the target thickness of the rolled piece, and the straightening force single cylinder is 1.0-1.5 Mbar.
6. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: when the head is straightened, the low-speed straightening is adopted at 0.5m/s, and the high speed and the low speed of the body can be freely selected.
7. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: the adjusting range of the edge roller of the straightener is +/-10 mm, and the 0 position is horizontal to the upper roller surface of the lower straightener roller, namely the working reference surface.
8. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: the single-cylinder force adjustment range of the straightening force is 0-2.5 Mbar.
9. The method for solving the buckling head of the rolled piece with the length of more than 18mm of the medium plate straightener as claimed in claim 1 is characterized in that: and step S4 and step S6 set technological parameters in advance, and the height position of the edge roller is only needed to be modified in the straightening process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110670166.4A CN113523022A (en) | 2021-06-17 | 2021-06-17 | Solution method for warping buckle head of rolled piece with thickness of more than 18mm of medium plate straightener |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110670166.4A CN113523022A (en) | 2021-06-17 | 2021-06-17 | Solution method for warping buckle head of rolled piece with thickness of more than 18mm of medium plate straightener |
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| CN113523022A true CN113523022A (en) | 2021-10-22 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001105006A (en) * | 1999-09-30 | 2001-04-17 | Sumitomo Metal Ind Ltd | Production of thick steel plate and this apparatus |
| CN101716618A (en) * | 2009-11-13 | 2010-06-02 | 秦皇岛首秦金属材料有限公司 | Method for penetrating straightening steel plate of thermal straightening machine |
| RU2432221C1 (en) * | 2010-04-09 | 2011-10-27 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") | Method of straightening rolled thick-sheet |
| CN102228914A (en) * | 2011-05-04 | 2011-11-02 | 南京钢铁股份有限公司 | Roll gap positioning method for straightening machine |
| CN102699144A (en) * | 2012-05-15 | 2012-10-03 | 北京首钢自动化信息技术有限公司 | Method for straightening seriously warped steel plate |
| CN104772367A (en) * | 2014-01-10 | 2015-07-15 | 宝山钢铁股份有限公司 | Rapid thick plate straightening method |
| CN104998927A (en) * | 2015-07-10 | 2015-10-28 | 南京钢铁股份有限公司 | Thick standard hot rolling nose plate thermal straightening process |
| WO2021063364A1 (en) * | 2019-09-30 | 2021-04-08 | 宝钢湛江钢铁有限公司 | High-efficiency double-frame double-cutting line feed-through intermediate thickness slab production line and production method |
-
2021
- 2021-06-17 CN CN202110670166.4A patent/CN113523022A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001105006A (en) * | 1999-09-30 | 2001-04-17 | Sumitomo Metal Ind Ltd | Production of thick steel plate and this apparatus |
| CN101716618A (en) * | 2009-11-13 | 2010-06-02 | 秦皇岛首秦金属材料有限公司 | Method for penetrating straightening steel plate of thermal straightening machine |
| RU2432221C1 (en) * | 2010-04-09 | 2011-10-27 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") | Method of straightening rolled thick-sheet |
| CN102228914A (en) * | 2011-05-04 | 2011-11-02 | 南京钢铁股份有限公司 | Roll gap positioning method for straightening machine |
| CN102699144A (en) * | 2012-05-15 | 2012-10-03 | 北京首钢自动化信息技术有限公司 | Method for straightening seriously warped steel plate |
| CN104772367A (en) * | 2014-01-10 | 2015-07-15 | 宝山钢铁股份有限公司 | Rapid thick plate straightening method |
| CN104998927A (en) * | 2015-07-10 | 2015-10-28 | 南京钢铁股份有限公司 | Thick standard hot rolling nose plate thermal straightening process |
| WO2021063364A1 (en) * | 2019-09-30 | 2021-04-08 | 宝钢湛江钢铁有限公司 | High-efficiency double-frame double-cutting line feed-through intermediate thickness slab production line and production method |
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Application publication date: 20211022 |
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