CN114535311B - Control method for hot rolling W-shaped section of wide aluminum plate strip - Google Patents
Control method for hot rolling W-shaped section of wide aluminum plate strip Download PDFInfo
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- CN114535311B CN114535311B CN202111372020.8A CN202111372020A CN114535311B CN 114535311 B CN114535311 B CN 114535311B CN 202111372020 A CN202111372020 A CN 202111372020A CN 114535311 B CN114535311 B CN 114535311B
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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
- B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls
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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
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- 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
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention provides a control method for a wide aluminum plate strip hot rolling W-shaped section, and belongs to the technical field of steel rolling automation. The method controls the W-shaped section profile by adjusting a plate shape control strategy to reduce the roll bending force and adjusting a sectional cooling strategy to change the thermal expansion distribution of the roll. For a four-roller CVC rolling mill, the positive roll shifting of the working roll is equivalent to positive roll bending, so that the roll bending force is reduced by increasing the roll shifting amount, the convexity of a rolled piece is ensured, and the W-shaped section trend of the rolled piece is reduced. Meanwhile, the thermal expansion amount of the edge position of the roller is improved by reducing the spraying amount of the edge of the rolled piece, and then the tilting position of the W-shaped edge is pressed down to reduce the trend of the W-shaped section of the rolled piece. The method can effectively control the W-shaped section in the rolling process of the aluminum plate strip, not only improves the plate shape quality of the aluminum plate strip, but also provides an idea for perfecting the hot-rolled plate shape control theory.
Description
Technical Field
The invention relates to the technical field of steel rolling automation, in particular to a control method for a wide aluminum plate strip hot rolling W-shaped section.
Background
The aluminum and aluminum alloy products have a series of advantages of high specific strength, good toughness, light weight, corrosion resistance and the like, and are widely applied to the fields of construction, transportation, aviation, aerospace and the like. With the continuous increase of the annual output of the aluminum plate strip, the requirements of downstream processes and users on the product quality are also continuously improved, and the plate shape is regarded as one of important quality indexes to gain more and more attention. In particular, in a wide rolling mill having a roll length of 3000mm or more, the roll system deflection deformation is more complicated, and when a narrow gauge aluminum alloy represented by 6XXX series is rolled (the rolled material width is 1300mm to 2000 mm), a high-order W-shaped cross-sectional profile, that is, the edge portion position is thickened, tends to occur. At present, the research on the aluminum plate strip mostly focuses on the aspect of convexity and flatness control, the research on the complex section contour is very little, and the problem of the W-shaped section cannot be explained and solved. However, such a section is liable to cause poor coil shape, and generates edge waves in the subsequent cold rolling process, which seriously affects the yield and competitiveness of the product, so that the generation mechanism and control method of the sheet shape defect need to be researched.
Disclosure of Invention
The invention aims to provide a control method for a wide aluminum plate strip hot rolling W-shaped section.
The method controls the hot-rolled W-shaped section of the wide aluminum plate strip by reducing the roller bending force and adjusting the sectional cooling strategy.
For a four roll CVC mill, the commonly used shape control means include both hydraulic roll bending and work roll shifting. And the positive roll shifting of the working roll is equivalent to positive roll bending, so that the roll bending force can be reduced by increasing the roll shifting amount, the convexity of the rolled piece is ensured, and the W-shaped section trend of the rolled piece is reduced.
Therefore, reducing the roll bending force is specifically: according to the crown regulation effect equivalent principle, under the condition of ensuring that the crown of a rolled piece is not changed, the roll shifting quantity is increased to reduce the roll bending force, so that the roll bending force is kept below 1000kN, and the corresponding roll shifting quantity is obtained by converting the roll shifting quantity and the efficiency conversion coefficient of the roll bending to the crown of the strip steel, which are obtained by calculating the roll bending force and the process control model, namely the trend of the W-shaped section of the rolled piece is reduced by reducing the local bending deformation of the edge part caused by the roll bending. The specific calculation is as follows:
in the formula,. DELTA.F B The roll bending force reducing value is delta s is a roll shifting quantity increasing value, alpha is roll shifting quantity required by unit convexity change and is obtained by calculation of a secondary control model according to the deformation working condition of a roll system rolled piece, and beta is the roll bending force required by unit convexity change and is obtained by calculation of the secondary control model according to the deformation working condition of the roll system rolled piece.
The adjustment of the sectional cooling strategy specifically comprises the following steps: closing the upper and lower rows of nozzles at the corresponding positions of the two side parts of the plate strip, reducing the spraying amount of 70-80mm of the rolled part side part to improve the thermal expansion amount of the roller side part position, and further pressing down the tilting position of the W-shaped side part.
The method is suitable for a four-roller CVC rolling mill.
The technical scheme of the invention has the following beneficial effects:
in the scheme, two methods of positive roll shifting of the working roll and adjustment of sectional cooling strategies are adopted to change the thermal expansion distribution of the roll, so that the edge pressing of the strip is controlled, the W-shaped section profile of the aluminum plate strip is effectively improved, and the plate shape quality of the aluminum plate strip is improved.
Drawings
FIG. 1 is a comparison of an original cooling strategy for hot rolling of wide aluminum strip in accordance with the present invention, wherein (a) is the original cooling strategy and (b) is the new cooling strategy;
FIG. 2 is a graph of work roll surface temperature distribution and thermal expansion distribution for different cooling strategies, wherein (a) is the temperature distribution and (b) is the thermal expansion distribution;
fig. 3 is an actually measured outlet section profile of six rolls of aluminum alloy strips according to an embodiment of the present invention, where (a) is a first roll of aluminum alloy strip, (b) is a second roll of aluminum alloy strip, (c) is a third roll of aluminum alloy strip, (d) is a fourth roll of aluminum alloy strip, (e) is a fifth roll of aluminum alloy strip, and (f) is a sixth roll of aluminum alloy strip;
FIG. 4 is a sectional profile of a rolled material before and after adjustment, wherein (a) is before adjustment and (b) is after adjustment.
Detailed Description
To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a control method for a wide aluminum plate strip hot rolling W-shaped section.
The method controls the wide aluminum plate and strip hot rolling W-shaped section by reducing the roll bending force and adjusting the sectional cooling strategy.
Wherein, reducing the roll bending force specifically comprises: the roll bending force is reduced by increasing the roll shifting amount, and the W-shaped section trend of the rolled piece is reduced while the convexity of the rolled piece is ensured. The adjustment of the sectional cooling strategy specifically comprises the following steps: and reducing the spraying amount of the edge of the rolled piece to improve the thermal expansion amount of the edge of the roller, and further pressing down the tilting position of the W-shaped edge.
The optimization strategy for staged cooling is shown in FIG. 1. FIG. 1 (a) shows an original cooling strategy, wherein the spraying width of a cooling row is equal to the width of a rolled piece, which causes a temperature drop zone to be generated at a position near the edge of the rolled piece, so that the edge of the rolled piece is thickened; fig. 1 (b) shows a new cooling strategy, the spraying width of the cooling row is slightly smaller than the width of the rolled piece (namely, the nozzle at the edge of the rolled piece is closed), so that the thermal expansion amount of the working roll at the edge of the rolled piece is increased, and the tilting position of the W-shaped edge is pressed down.
The two cooling strategies are calculated by using the roll temperature field model, and the obtained surface temperature distribution and thermal expansion distribution of the working roll are shown in fig. 2 (a) and 2 (b), so that the temperature of the edge part of a rolled piece obviously rises under the new cooling strategy, the corresponding thermal expansion amount of the edge part of the rolled piece rises, and a 'steep drop zone' of the thermal expansion of the roll moves outwards.
The following description is given with reference to specific examples.
Continuously producing 6 coils of 6XXX series aluminum alloy plate strips, wherein the rolling process of each coil is the same as that of the following coils: 3 times of rolling, the last time of entrance thickness is 10.90mm, the exit thickness is 7.06mm, the last time of reduction rate is 35.2%, the width of the finished product is 1530mm, and the data of rolling force, roll bending force, roll shifting value and the like of each roll are shown in Table 1.
TABLE 1 last operating mode parameters of each coil in production test
The measured outlet profile of the 6 rolls of aluminum sheet is shown in fig. 3. Under the original plate shape control strategy, the No. 1 roll (FIG. 3 (a)) has a clear W-shaped section; from the 2 nd coil (figure 3 (b)), the roll shifting value is gradually increased on the operating platform of the rolling mill, the roll shifting value is increased from-100 mm to-20 mm, the roll bending force is reduced along with the roll shifting value, the roll bending force is reduced from 2397kN to 506kN, and the W-shaped trend of the section profile gradually disappears. Experiments prove that the trend of the W-shaped section can be effectively relieved by improving the roll shifting value so as to reduce the roll bending force.
In the aspect of sectional cooling, according to the strategy, 1 row of cooling nozzles on the upper side and the lower side of the two sides of the edge of a rolled piece are closed during a field production test, the spraying distribution is shown as figures 1 (a) and 1 (b), the section profile changes of finish rolling outlets before and after adjustment are shown in figures 4 (a) and 4 (b), and the optimization sectional cooling strategy has a slowing effect on a W-shaped section.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A control method for a wide aluminum plate strip hot rolling W-shaped section is characterized in that the wide aluminum plate strip hot rolling W-shaped section is controlled by reducing roll bending force and adjusting a sectional cooling strategy;
the method for reducing the roll bending force specifically comprises the following steps: according to the convexity control effect equivalent principle, under the condition that the convexity of a rolled piece is not changed, the roll shifting quantity is increased to reduce the roll bending force, so that the roll bending force is kept below 1000kN, and the corresponding roll shifting quantity is obtained by converting roll shifting obtained by the calculation of the roll bending force and a process control model and the efficiency conversion coefficient of the roll bending to the convexity of the rolled piece:
in the formula,. DELTA.F B The roll bending force is a roll bending force reduction value, deltas is a roll shifting amount increase value, alpha is roll shifting amount required by unit convexity change and is obtained by calculation of a secondary control model according to the deformation working condition of a roll system rolled piece, and beta is roll bending force required by unit convexity change and is obtained by calculation of the secondary control model according to the deformation working condition of the roll system rolled piece;
the adjusting of the sectional cooling strategy specifically comprises the following steps: closing the upper and lower rows of nozzles at the corresponding positions of the two side edges of the plate strip, reducing the spraying amount of 70-80mm of the plate strip side edges to improve the thermal expansion amount of the roller side edge positions, and further pressing down the tilting positions of the W-shaped side edges.
2. A method for controlling a hot-rolled W-shaped section of a wide aluminum strip as claimed in claim 1, wherein the method is applied to a four-roll CVC rolling mill.
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| CN114535311B true CN114535311B (en) | 2023-01-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551394A (en) * | 2013-11-06 | 2014-02-05 | 河北省首钢迁安钢铁有限责任公司 | Control method for side reverse tilting on thickness profile of low-silicon non-oriented silicon steel |
| CN105436208A (en) * | 2014-08-14 | 2016-03-30 | 宝山钢铁股份有限公司 | Edge-drop control method during rolling process |
| CN106975663A (en) * | 2016-01-15 | 2017-07-25 | 宝山钢铁股份有限公司 | Solve the problems, such as the milling train roll shifting control method of edge thickening |
| CN110404966A (en) * | 2018-04-27 | 2019-11-05 | 宝山钢铁股份有限公司 | It is used to prepare the roughing technique and method of high-strength high-tractility magnesium alloy thin plate |
| CN112007956A (en) * | 2019-05-30 | 2020-12-01 | 上海梅山钢铁股份有限公司 | Hot rolling and finish rolling variable-convexity control method |
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- 2021-11-18 CN CN202111372020.8A patent/CN114535311B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551394A (en) * | 2013-11-06 | 2014-02-05 | 河北省首钢迁安钢铁有限责任公司 | Control method for side reverse tilting on thickness profile of low-silicon non-oriented silicon steel |
| CN105436208A (en) * | 2014-08-14 | 2016-03-30 | 宝山钢铁股份有限公司 | Edge-drop control method during rolling process |
| CN106975663A (en) * | 2016-01-15 | 2017-07-25 | 宝山钢铁股份有限公司 | Solve the problems, such as the milling train roll shifting control method of edge thickening |
| CN110404966A (en) * | 2018-04-27 | 2019-11-05 | 宝山钢铁股份有限公司 | It is used to prepare the roughing technique and method of high-strength high-tractility magnesium alloy thin plate |
| CN112007956A (en) * | 2019-05-30 | 2020-12-01 | 上海梅山钢铁股份有限公司 | Hot rolling and finish rolling variable-convexity control method |
Non-Patent Citations (1)
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| 六辊冷连轧机带钢边降控制性能仿真研究;轩康乐等;《轧钢》;20171215;第33-38页 * |
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