CN109604350B - Method for improving tail quality of hot-rolled strip steel - Google Patents
Method for improving tail quality of hot-rolled strip steel Download PDFInfo
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- CN109604350B CN109604350B CN201811572757.2A CN201811572757A CN109604350B CN 109604350 B CN109604350 B CN 109604350B CN 201811572757 A CN201811572757 A CN 201811572757A CN 109604350 B CN109604350 B CN 109604350B
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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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
- B21B37/72—Rear end control; Front end control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/20—End shape; fish tail; tongue
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Abstract
The invention discloses a method for improving the tail quality of hot-rolled strip steel, which comprises the following steps: the finishing mill has a lubricating rolling function, and when the upstream frame throws steel, the downstream frame closes lubricating rolling oil. By applying the method provided by the invention, the lubricating oil closing time sequence is adjusted to that when the upstream rack throws steel, the downstream rack closes the lubricating oil, so that the rolling of the strip steel tail without lubricating oil is shortened to about 4 m. Therefore, the rolling force is prevented from being greatly increased, the roll bending force increase caused by the increase of the rolling force is reduced, the strip steel middle wave caused by the sudden increase of the roll bending force is further reduced, the rolling stability of the strip steel at the tail part is ensured, and the tail part quality of the hot-rolled strip steel is improved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for improving the tail quality of hot-rolled strip steel.
Background
With the increasing demand of automobile users and household electrical appliances for hot rolling thin specifications, the production tasks of conventional hot rolling mills for thin specifications are increasing. The difficulty of producing high-surface thin specifications by conventional hot continuous rolling is in strip shape control at the tail part of the strip steel, once the tail part of the strip steel is rolled to be broken, the strip steel faces the risk of surface quality defects in subsequent production, and the control of the rolled breakage at the tail part of the strip steel becomes an important link for smooth production.
The existing hot continuous rolling line is basically provided with plate shape control functions such as bending rolls, roll shifting and the like, and meanwhile, a plurality of production lines are also provided with rolling lubrication functions to improve the surface quality of strip steel. However, the tail of the strip steel is still rolled to be broken frequently when the thin gauge is rolled, so that the defect of unqualified surface quality is increased, and the roll changing frequency is additionally increased, thereby seriously influencing the production stability.
In summary, how to effectively solve the problems that the tail of the strip steel is easy to be rolled to be broken and the surface quality of the product is influenced when the thin-specification strip steel is continuously rolled is the problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, the invention aims to provide a method for improving the tail quality of hot-rolled strip steel, which can effectively solve the problem that the tail of the strip steel is easy to be broken and the surface quality of a product is influenced when the thin-gauge strip steel is hot-rolled in a continuous rolling manner.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for improving the tail quality of hot-rolled strip steel comprises the following steps: the finishing mill has a lubricating rolling function, and when the upstream frame throws steel, the downstream frame closes lubricating rolling oil.
Preferably, the method for improving the tail quality of the hot-rolled strip steel further comprises the following steps: and when the tail part of the upstream frame throws steel, controlling the roll bending force to be reduced to be equal to the balance force.
Preferably, in the method for improving the tail quality of the hot-rolled strip steel, the closing of the lubricating rolling oil by the downstream stand specifically includes:
the controller controls the downstream machine frame to close the lubricating rolling oil.
By applying the method for improving the tail quality of the hot-rolled strip steel, the finish rolling mill has a lubricating rolling function, and lubricating rolling oil is closed by a downstream frame when the upstream frame throws the steel. Through data analysis during tail rolling, the lubricating oil is turned off when the lubricating rolling function is put into use and the strip steel does not leave the F1 rolling mill at the tail, after the lubricating rolling oil is turned off, the rolling force begins to rise, about 15m is acted on the tail of the strip steel, and the roll bending force rises rapidly due to long-time large rolling force, so that the tail of the strip steel is rolled to be broken. In order to shorten the rolling length after the lubricating oil is closed, the lubricating oil closing time sequence is adjusted to that when the upstream rack throws steel, the downstream rack closes the lubricating oil, so that the rolling without lubricating oil at the tail part of the strip steel is shortened to about 4 m. Therefore, the rolling force is prevented from being greatly increased, the roll bending force increase caused by the increase of the rolling force is reduced, the strip steel middle wave caused by the sudden increase of the roll bending force is further reduced, the rolling stability of the strip steel at the tail part is ensured, and the tail part quality of the hot-rolled strip steel is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for improving the tail quality of a hot rolled strip according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a method for improving the tail quality of hot-rolled strip steel, which is used for avoiding the tail of the strip steel from being rolled to be broken when the thin-specification strip steel is continuously rolled and improving the surface quality of a product.
The technical solutions in the embodiments of the present invention will be clearly and completely described 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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for improving the tail quality of a hot rolled strip according to an embodiment of the present invention.
In one embodiment, the present invention provides a method for improving the tail quality of a hot rolled strip, comprising:
s1: the finishing mill has a lubricating rolling function, and when the upstream frame throws steel, the downstream frame closes lubricating rolling oil.
The hot rolling thin specification strip steel has the advantages that the rolling time is long, the contact time of the strip steel and the roller is prolonged, the thermal convexity of the roller is larger than that of the common strip steel during rolling, meanwhile, the temperature drop of the tail part of the strip steel is more severe along with the increase of the rolling time, the rolling force rises more quickly, the rolling difficulty of the tail part is increased, and the problem of tail part rolling rotting is easily caused.
The tail rolling erosion caused by the analysis of the field rolling plate shape change condition and the final steel coil material object defect is mainly caused by that the middle wave is large when the tail of the strip steel is rolled, the strip steel is forced to move to one side of a roller after the middle wave exists in a rolling mill, the tail flicking erosion is caused, and the middle part of the strip steel is directly punched and rolled into erosion due to the overlarge middle wave.
The reason for causing the middle wave during the rolling of the tail part of the strip steel is mainly that the roll bending force is increased along with the increase of the rolling force during the rolling of the tail part, and the larger roll bending force causes the middle wave of the strip steel.
The reason why the rolling force of the tail part is gradually increased is that: the hot crown of the roller is gradually increased along with the increase of the rolling time, particularly the hot crown reaches the maximum value when the tail of the strip steel is rolled, the roller gap of the roller is relatively small, and the rolling force is suddenly increased; the rolling is gradually increased when the temperature of the tail part of the strip steel is greatly reduced; at the tail part, the rolling force can gradually rise after the rolling lubricating oil is closed.
By analyzing the data during tail rolling, when the lubrication rolling function is put into use, the lubricating oil starts to be closed when the strip steel does not leave the F1 rolling mill at the tail, after the lubrication rolling oil is closed, the rolling force starts to rise, about 15m is acted on the tail of the strip steel, and the roll bending force can be increased by large rolling force for a long time, so that the tail of the strip steel is rolled to be broken by waves. In order to shorten the rolling length after the lubricating oil is closed, the lubricating oil closing time sequence is adjusted to that when the upstream rack throws steel, the downstream rack closes the lubricating oil, so that the rolling without lubricating oil at the tail part of the strip steel is shortened to about 4 m. Therefore, the rolling force is prevented from being greatly increased, the roll bending force increase caused by the increase of the rolling force is reduced, the strip steel middle wave caused by the sudden increase of the roll bending force is further reduced, the rolling stability of the strip steel at the tail part is ensured, and the tail part quality of the hot-rolled strip steel is improved.
Further, still include: and when the tail part of the upstream frame throws steel, controlling the roll bending force to be reduced to be equal to the balance force. When the tail of the strip steel is rolled, the closing rolling force of lubricating oil can be increased, the roll bending force control can also be increased along with the increase of the rolling force, and the rapid increase of the roll bending force can easily cause the strip steel to generate medium wave and breakage. Although the closing of the tail lubricating oil is optimized, the rolling force of part of the length is still increased sharply, and the situation that the rolling force is stable until steel throwing cannot be completely avoided. Therefore, when the steel is thrown at the tail part of the upstream frame, the roll bending force control is reduced to the value of the balance force, the roll bending force control does not change along with the change of the rolling force, the middle wave of the strip steel caused by the sudden increase of the roll bending force is effectively controlled, and the rolling stability of the strip steel at the tail part is ensured.
Specifically, the downstream frame closes lubricated rolling oil, specifically includes:
the controller controls the downstream machine frame to close the lubricating rolling oil. Namely, the operation of closing the lubricating rolling oil is realized through the control instruction of the controller, the automation degree is high, and the control precision is high. Of course, the rolling lubricating oil of the downstream stand can be manually shut off when the upstream stand is observed to throw steel by manual control according to needs.
In conclusion, the invention reduces the rolled breakage of the tail part of the strip steel caused by medium waves by optimally controlling the roll bending force of the rolled tail part of the strip steel, improves the rolling stability and meets the requirement of high-quality surface of thin-specification strip steel. The rolling mill can effectively control the problem of rolled breakage caused by large shape change of the tail part of the strip steel in the finishing mill frame, improves the rolling stability of the strip steel in the finishing mill, reduces the abnormal roll changing times of the hot rolling finishing mill, has positive effects on improving the surface quality of the hot rolled strip steel and reducing the roll consumption, and is a key technology for controlling the production of the hot rolled strip steel.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. A method for improving the tail quality of hot-rolled strip steel is characterized by comprising the following steps: the finishing mill is put into use lubricated rolling function to when upstream frame is thrown the steel, lubricated rolling oil is closed to downstream frame, still includes: when the tail part of the upstream frame is cast, the roll bending force is controlled to be reduced to be equal to the balance force; the downstream frame closes lubricated rolling oil, specifically includes:
the controller controls the downstream machine frame to close the lubricating rolling oil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811572757.2A CN109604350B (en) | 2018-12-21 | 2018-12-21 | Method for improving tail quality of hot-rolled strip steel |
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| CN201811572757.2A CN109604350B (en) | 2018-12-21 | 2018-12-21 | Method for improving tail quality of hot-rolled strip steel |
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| CN109604350A CN109604350A (en) | 2019-04-12 |
| CN109604350B true CN109604350B (en) | 2020-11-17 |
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| CN111389925B (en) * | 2020-03-20 | 2021-11-09 | 武汉钢铁有限公司 | Control method for reducing transverse thickness difference of hot-rolled strip steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2808349Y (en) * | 2005-05-11 | 2006-08-23 | 攀枝花新钢钒股份有限公司 | Lubrication unit for hot rolling process |
| CN102189111A (en) * | 2011-03-17 | 2011-09-21 | 湖南华菱涟源钢铁有限公司 | Roll gap lubricating method for producing ultrathin hot-rolled strip steel by using semi-endless rolling technology |
| CN102989787A (en) * | 2012-12-21 | 2013-03-27 | 鞍钢股份有限公司 | Hot-rolled strip steel head and tail plate shape control method |
| CN103028613A (en) * | 2011-09-30 | 2013-04-10 | 鞍钢股份有限公司 | Method for improving shape quality of head or tail of hot-rolled strip steel |
-
2018
- 2018-12-21 CN CN201811572757.2A patent/CN109604350B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2808349Y (en) * | 2005-05-11 | 2006-08-23 | 攀枝花新钢钒股份有限公司 | Lubrication unit for hot rolling process |
| CN102189111A (en) * | 2011-03-17 | 2011-09-21 | 湖南华菱涟源钢铁有限公司 | Roll gap lubricating method for producing ultrathin hot-rolled strip steel by using semi-endless rolling technology |
| CN103028613A (en) * | 2011-09-30 | 2013-04-10 | 鞍钢股份有限公司 | Method for improving shape quality of head or tail of hot-rolled strip steel |
| CN102989787A (en) * | 2012-12-21 | 2013-03-27 | 鞍钢股份有限公司 | Hot-rolled strip steel head and tail plate shape control method |
Non-Patent Citations (2)
| Title |
|---|
| "热轧工艺润滑技术在宝钢2050mm热连轧的应用";何晓明等;《钢铁》;19991031;第34卷;第839页左栏最后1行到第840页第12行 * |
| 何晓明等."热轧工艺润滑技术在宝钢2050mm热连轧的应用".《钢铁》.1999,第34卷第839页左栏最后1行到第840页第12行. * |
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