CN109604356B - Method for controlling scratching iron oxide defects of hot-rolled coil box - Google Patents
Method for controlling scratching iron oxide defects of hot-rolled coil box Download PDFInfo
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- CN109604356B CN109604356B CN201811423711.4A CN201811423711A CN109604356B CN 109604356 B CN109604356 B CN 109604356B CN 201811423711 A CN201811423711 A CN 201811423711A CN 109604356 B CN109604356 B CN 109604356B
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- roll
- roller
- upper bending
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000007547 defect Effects 0.000 title claims abstract description 22
- 238000006748 scratching Methods 0.000 title claims description 8
- 230000002393 scratching effect Effects 0.000 title claims description 8
- 238000005452 bending Methods 0.000 claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000005098 hot rolling Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 26
- 229910052742 iron Inorganic materials 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- 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
- B21B39/20—Revolving, turning-over, or like manipulation of work, e.g. revolving in trio stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Metal Rolling (AREA)
Abstract
The application discloses a method for controlling the scratch iron oxide defect of a hot rolling coil box, wherein a first upper bending roll, a lower bending roll, a second upper bending roll, a coiling roll, a coil supporting roll, a coil releasing roll and a pinch roll are sequentially arranged in the hot rolling coil box, the inlet of the hot coil box is provided with high-pressure water which is over against the upper surface and the lower surface of the steel strip, the levelness of the first upper bending roll, the lower bending roll and the second upper bending roll is less than 0.5mm/m, the levelness of the supporting roller is less than 0.1mm/m, the distance between the first upper bending roller and the lower bending roller and the roll gap between the second upper bending roller and the lower bending roller are 45-55mm respectively, the first upper bending roll or the lower bending roll or the second upper bending roll is provided with a high-pressure water blowing and cooling device, the head of the threading speed of the hot coiling box is 3.0m/s, the speed of the middle and tail parts is 4.0-4.5m/s, and the speed raising rate is less than 0.2 m/s.2And the rotating speed of the winding roller is less than that of the first upper bending roller, the lower bending roller or the second upper bending roller and less than that of the backing roller. The method has the advantage of greatly reducing the defect of the scratch iron scale of the hot coil box.
Description
Technical Field
The application relates to the technical field of hot rolling, in particular to a method for controlling the scratching iron oxide defect of a hot rolling coil box.
Background
When producing hot rolled strip steel, especially thin hot rolled strip steel, the intermediate blank has long retention time between the roughing mill and the finishing mill, fast temperature drop speed, large head-tail temperature difference and large edge temperature drop. These all affect the strip thickness tolerance accuracy. At present, most iron and steel enterprises use a hot coil box to solve the temperature drop problem of thin-specification strip steel.
The hot coil box is positioned between a rough rolling mill and a finishing mill of a hot rolling production line, and mainly has the main functions of carrying out mandrel-free coiling on a rough rolling intermediate billet, uncoiling the rough rolling intermediate billet to remove the head and the tail of the intermediate billet and the upper and lower surfaces of the intermediate billet, and then feeding the intermediate billet into a finishing mill group for rolling.
The most important characteristics of the hot coil box are that firstly, the temperature of the strip steel is uniform: the heat transfer and the heat radiation are generated after the intermediate blank is coiled, so that the head-tail temperature difference of the strip steel can be reduced, the temperature drop of the edge of the strip steel can be reduced, and the black mark generated by the strip steel in a heating furnace can be reduced; secondly, the scale breaking effect is achieved: the mechanical bending deformation in the coiling and uncoiling process enables the brittle and hard iron scale on the surface of the strip steel to be broken, and the finish rolling and descaling become easier. Thirdly, the metal yield is improved: when thin gauge strip steel is produced, in order to reduce the head-tail temperature difference of the intermediate billet, the temperature of a casting blank in the furnace must be obviously improved. By adopting the hot coil box, the heating temperature does not need to be greatly increased, the oxidation burning loss of the casting blank in the heating furnace is reduced, and the energy consumption is saved.
The use of the hot coil box effectively reduces the temperature drop problem of the hot rolled strip steel, but the bending of the strip steel by the bending roller easily causes surface defects to the strip steel, particularly scratches on the surface of a high-strength hot rolled sheet such as an acid-washed automobile sheet. The bending roller is in contact with the surface of the intermediate blank for a long time, so that the iron scale is adhered to the bending roller, and further the scratch-type iron scale defect is generated on the surface of the intermediate blank. The surface abrasion iron scale defect brought by the hot coil box to the high-strength hot-rolled sheet seriously affects the surface quality of the strip steel, a large amount of manpower and material resources are input for technical attack in each steel mill, and the prior effective method is to adopt a bending roller with surfacing welding and excellent wear resistance and needs to be replaced regularly. The method has obvious effect of controlling the defects of the surface scratch type iron scale, but has high cost.
Disclosure of Invention
The invention aims to provide a method for controlling the defect of scratching iron oxide of a hot rolling coil box, which overcomes the defects of the prior art.
In order to achieve the above object, the present invention provides the following technical solutions.
The embodiment of the application discloses a method for controlling the defect of abrasive iron oxide in a hot rolling coil box, wherein a first upper bending roll, a lower bending roll, a second upper bending roll, a coiling roll, a coil supporting roll, a coil unwinding roll and a pinch roll are sequentially arranged in the hot rolling coil box,
the inlet of the hot coil box is provided with high-pressure water which is over against the upper surface and the lower surface of the steel strip,
the levelness of the first upper bending roller, the lower bending roller and the second upper bending roller is less than 0.5mm/m, the levelness of the supporting roller is less than 0.1mm/m,
the roll gap distance between the first upper bending roll and the lower bending roll and the roll gap distance between the second upper bending roll and the lower bending roll are 45-55mm respectively,
the first upper bending roll or the lower bending roll or the second upper bending roll is provided with a high-pressure water blowing and cooling device,
the head of the threading speed of the hot coil box is 3.0m/s, the middle and tail speeds are 4.0-4.5m/s, and the speed-up rate is less than 0.2m/s2，
The rotating speed of the winding roller is less than that of the first upper bending roller, the lower bending roller or the second upper bending roller and less than that of the backing roller.
Preferably, in the method for controlling the scratching iron oxide defects in the hot-rolling box, two carrier rolls are provided.
Preferably, in the method for controlling the scratching iron oxide defects in the hot-rolling box, the support roller is far away from the winding roller after the winding roller winds 4 to 5 circles, and the far-away speed is less than or equal to 25 mm/s.
Preferably, in the method for controlling the scratching iron oxide defects of the hot rolling coil box, two pinch rolls are arranged oppositely from top to bottom, and the two pinch rolls are separated after biting the steel from the rear.
Compared with the prior art, the method has the advantages that the technology of the coil box is optimized, the coil box equipment is simply transformed, the defect of the scratch iron scale of the coil box is greatly reduced, expensive equipment is not needed, frequent replacement is not needed, and the cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of the interior of a heat coil box in an embodiment of the present invention;
FIG. 2 shows a scratch scale defect micro-topography;
fig. 3 shows the microscopic appearance of the iron scale by adopting the technical scheme of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-3, a method for controlling the scratch iron oxide defect of a hot rolling coil box, wherein a first upper bending roll 100, a lower bending roll 200, a second upper bending roll 300, a winding roll 400, a supporting roll 500, an unwinding roll 600 and a pinch roll 700 are sequentially arranged in the hot rolling coil box, two supporting rolls 500 are arranged,
the inlet of the coil box is provided with high-pressure water which is over against the upper surface and the lower surface of the steel strip 800,
the levelness of the first upper bending roller 100, the lower bending roller 200 and the second upper bending roller 300 is less than 0.5mm/m, the levelness of the supporting roller 500 is less than 0.1mm/m,
the first upper bending roll 100 and the second upper bending roll 300 respectively have a roll gap distance of 45-55mm from the lower bending roll 200,
the first upper bending roll 100 or the lower bending roll 200 or the second upper bending roll 300 is provided with a high-pressure water blowing and cooling device,
the head of the threading speed of the hot coiling box is 3.0m/s, the middle and tail speeds are 4.0-4.5m/s, and the speed increasing rate is less than 0.2m/s2，
The rotating speed of the winding roller 400 is less than that of the first upper bending roller 100, the lower bending roller 200 or the second upper bending roller 300 is less than that of the backing roller 500.
After the coiling roller 400 coils for 4-5 circles, the supporting roller 500 is far away from the coiling roller 400, and the far-away speed is less than or equal to 25 mm/s.
Two pinch rolls 700 are arranged up and down oppositely, and the two pinch rolls 700 are separated after being bitten by steel from the rear.
In the technical scheme, expensive bending rolls are not needed, equipment does not need to be replaced frequently, only descaling and purging devices are needed, and related processes are optimized to realize surface defect-free rolling of the hot-rolled high-strength plate, so that the rolling is easy to realize.
A high-pressure water descaling device is added at the inlet of the hot rolling box, so that the adhesion of the iron scale of the intermediate billet on a bending roller of the hot rolling box can be effectively reduced; the levelness of the bending roller and the supporting roller of the hot coil box and the roller gap of the bending roller of the hot coil box are controlled, so that the uneven abrasion of a steel coil and the roller surface can be effectively reduced; the bending roller is additionally provided with a roller surface high-pressure water blowing and cooling device, so that the temperature of the bending roller can be effectively reduced, the roller surface iron scale can be effectively removed, and the adhesion of the iron scale on the roller surface can be reduced; after the intermediate billet is coiled for 4-5 circles, the supporting roller is automatically and slowly opened, so that the contact time between the supporting roller and the intermediate billet can be reduced, and the abrasion between the supporting roller and the surface of the strip steel can be reduced; the head of the threading speed of the hot coiling box is 3.0m/s, the speed of the middle and tail parts is 4.0-4.5m/s, the speed raising rate is less than 0.2m/s2, the speed of the intermediate blank is less than the speed of the bending roller and less than the speed of the coil supporting roller during coiling, and the problems of coil loosening and flat coiling after the bending roller is opened can be prevented; after the F1 bites the steel, the roll gap of the pinch roll is automatically lifted, so that the contact time between the intermediate billet and the pinch roll can be effectively reduced, and the abrasion is reduced.
The invention effectively solves the problem of the scratch iron scale defect of the hot-rolled strip steel caused by using the hot coil box, and has good economic benefit and social benefit.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (4)
1. A control method for the scratch iron oxide defect of a hot rolling coil box is characterized in that a first upper bending roll, a lower bending roll, a second upper bending roll, a coiling roll, a coil supporting roll, a coil releasing roll and a pinch roll are sequentially arranged in the hot rolling coil box,
the inlet of the hot coil box is provided with high-pressure water which is over against the upper surface and the lower surface of the steel strip,
the levelness of the first upper bending roller, the lower bending roller and the second upper bending roller is less than 0.5mm/m, the levelness of the supporting roller is less than 0.1mm/m,
the roll gap distance between the first upper bending roll and the lower bending roll and the roll gap distance between the second upper bending roll and the lower bending roll are 45-55mm respectively,
the first upper bending roll, the lower bending roll or the second upper bending roll is provided with a high-pressure water blowing and cooling device which acts on the roll surface of the first upper bending roll, the lower bending roll or the second upper bending roll,
the head of the threading speed of the hot coil box is 3.0m/s, the middle and tail speeds are 4.0-4.5m/s, and the speed-up rate is less than 0.2m/s2，
The rotating speed of the winding roller is less than that of the first upper bending roller, the lower bending roller or the second upper bending roller and less than that of the backing roller.
2. The method of controlling gouge iron oxide defects in a hot rolled coil box according to claim 1, wherein two idler rolls are provided.
3. The method for controlling the scratching iron oxide defects of the hot-rolled hot-coil box according to claim 1, wherein the distance between the support roller and the winding roller is less than or equal to 25mm/s after 4 to 5 turns of winding by the winding roller.
4. The method as claimed in claim 1, wherein the pinch rolls are disposed opposite to each other in the vertical direction, and the pinch rolls are separated after biting the steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811423711.4A CN109604356B (en) | 2018-11-27 | 2018-11-27 | Method for controlling scratching iron oxide defects of hot-rolled coil box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811423711.4A CN109604356B (en) | 2018-11-27 | 2018-11-27 | Method for controlling scratching iron oxide defects of hot-rolled coil box |
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| CN109604356A CN109604356A (en) | 2019-04-12 |
| CN109604356B true CN109604356B (en) | 2021-02-12 |
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| CN201811423711.4A Active CN109604356B (en) | 2018-11-27 | 2018-11-27 | Method for controlling scratching iron oxide defects of hot-rolled coil box |
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| CN113798325A (en) * | 2020-06-14 | 2021-12-17 | 上海梅山钢铁股份有限公司 | Hot coiling box pinch roll device for preventing meat sticking and control method |
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| CN2493328Y (en) * | 2001-05-16 | 2002-05-29 | 中国第二重型机械集团公司 | Coreless feeding type themal steel winding box |
| CN101507977B (en) * | 2009-03-20 | 2012-06-06 | 燕山大学 | System error comprehensive compensation technique of strip-mill strip-shape detection device |
| CN102950156B (en) * | 2011-08-17 | 2015-03-04 | 五冶集团上海有限公司 | Mounting method of horizontal loop |
| CN104593687B (en) * | 2015-01-22 | 2016-09-28 | 首钢总公司 | The manufacture method of a kind of hot rolling high-strength wearable steel plate and hot rolling high-strength wearable steel plate |
| CN107952815A (en) * | 2017-11-16 | 2018-04-24 | 北京首钢股份有限公司 | A kind of production method of hot rolling acid-cleaning plate |
| CN208066974U (en) * | 2018-04-19 | 2018-11-09 | 二重（德阳）重型装备有限公司 | Blow device for Coil Box |
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Address after: 215600 Zhangjiagang Hongchang steel plate Co., Ltd., Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Jiangsu Shagang Steel Co.,Ltd. Patentee after: JIANGSU SHAGANG GROUP Co.,Ltd. Address before: 215600 Zhangjiagang Hongchang steel plate Co., Ltd., Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: ZHANGJIAGANG HONGCHANG STEEL PLATE Co.,Ltd. Patentee before: JIANGSU SHAGANG GROUP Co.,Ltd. |
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