CN109663817B - Transverse thickness precision control method of wide and thick plate flat roller mill - Google Patents
Transverse thickness precision control method of wide and thick plate flat roller mill Download PDFInfo
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- CN109663817B CN109663817B CN201811378730.XA CN201811378730A CN109663817B CN 109663817 B CN109663817 B CN 109663817B CN 201811378730 A CN201811378730 A CN 201811378730A CN 109663817 B CN109663817 B CN 109663817B
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
Abstract
The invention discloses a method for controlling the transverse thickness precision of a wide and thick plate flat roller mill, which is particularly suitable for producing a 14-40 mm thick steel plate by the wide and thick plate flat roller mill. After the working rolls are changed, the rolling force of the last two passes of the steel plates with different thickness specifications is limited, and when the convexity does not meet the requirement, a proper adjustment strategy is formulated, so that the convexity of the steel plates rolled by the wide and thick plate flat rolling mill can be effectively controlled, and the transverse thickness control precision of the wide and thick plate flat rolling mill is greatly improved.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a transverse thickness precision control method of a wide and thick plate flat roll mill.
Background
In the production of wide and thick plates, the thickness difference of the same plate of a steel plate is very important, and the longitudinal thickness difference along the length direction of the steel plate is mainly realized by reducing longitudinal roll gap fluctuation during rolling; the transverse thickness difference is mainly realized by presetting a convexity value through the roll shape of the roll and using a bending roll or a single bending roll. The thickness precision of the steel plate is influenced by the size of the transverse thickness difference, and meanwhile, the flatness of the steel plate is also greatly influenced. When the thickness of the middle part of the steel plate is larger than the thickness of the two sides, namely the positive convexity is larger, the steel plate will generate double-side waves, and the larger the positive convexity is, the larger the double-side waves of the steel plate are; when the thickness of the middle part of the steel plate is more than that of the two sides, namely the negative convexity is larger, the steel plate will generate middle waves, and the larger the negative convexity is, the larger the middle waves are. When the double-side waves or the medium waves are small, the normal rolling of the rolling mill is not influenced, and the defects can be eliminated by a subsequent hot straightening machine or a subsequent cold straightening machine; however, when the waves on both sides are large or the waves are large to a certain degree, steel clamping occurs during rolling of the rolling mill, and a roller and other equipment of the rolling mill are damaged, so that production accidents are caused. Even if steel clamping does not occur, the steel plates with large double-side waves or medium waves cannot be leveled by a hot straightener or a cold straightener, and the steel plates are finally rejected due to excessive flatness.
The work rolls of modern rolling mills are generally in the shape of rolls with controlled crown and are often also provided with bending rolls. The transverse thickness precision of the steel plate can be controlled easily, and the convexity of the steel plate can be controlled well according to needs. However, there are many older mills that have been flat rolls and have no curved rolls. The old rolling mills have few means when controlling the transverse thickness precision of the steel plate, the rolled steel plate is often seriously wavy, and finally, the excessive judgment of the steel plate caused by the flatness exceeds the standard is wasted.
The patent publication "CN 101850367 a" a strip shape control method aimed at reducing the maximum deviation amount "provides a method of controlling the thickness accuracy in the length and width directions of a strip steel, which can effectively control the thickness accuracy in the longitudinal and transverse directions of the strip steel. But the method has special requirements on the roll shape of the roll, and is suitable for the production of cold-rolled strip steel. And is not suitable for controlling the plate shape of a wide and thick plate rolling mill with flat rolls.
The patent publication "CN 102294362 a" a method for controlling thickness precision of medium plate "provides a method for controlling thickness along length direction and width direction of steel plate, which has better thickness control and higher thickness precision. However, the method has special requirements on the roll shapes of the supporting roll and the working roll, the control system is also complex, the realization is difficult, and the method cannot be used on a wide and thick plate rolling mill with flat rolls.
The patent publication No. CN 102744260A 'a working roll giving consideration to both strip steel convexity and edge drop control and a roll shape design method thereof' provides a method capable of better controlling the strip steel convexity. However, the method is realized by special requirements on the roll shape of the roll, is suitable for a continuous rolling unit and is not suitable for a wide and thick plate rolling mill with a flat roll.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a transverse thickness precision control method of a wide and thick plate flat rolling mill, which is particularly suitable for transverse thickness precision control of a wide and thick plate flat rolling mill for producing a steel plate with the thickness of 10-40 mm.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for controlling the transverse thickness precision of a wide and thick plate flat roller mill comprises the following steps:
s1, controlling the convexity of the steel plate to be 0.02-0.08 mm;
s2, rolling a first steel plate with the thickness of 10-20 mm after the working roll is replaced, controlling the rolling force of the last two passes between 18-22 MN, adjusting the rolling force of the last two passes of the next steel plate according to the actual convexity value of the previous steel plate, and reducing the rolling force of the last two passes of the next steel plate by 2 MN-6 MN if the convexity value of the previous steel plate is larger than 0.08 mm; if the convexity value of the previous steel plate is larger than 0.02mm, the rolling force of the last two passes of the next steel plate is increased by 2 MN-6 MN; adjusting according to the method until the convexity of the steel plate is controlled to be 0.02-0.08 mm;
s3, rolling a first steel plate with the thickness of 20mm < 40mm after the working roller is replaced, controlling the rolling force of the last two passes between 23 and 26MN, adjusting the rolling force of the last two passes of the next steel plate according to the actual convexity value of the previous steel plate, and reducing the rolling force of the last two passes of the next steel plate by 2MN to 6MN if the convexity value of the previous steel plate is greater than 0.08 mm; if the convexity value of the previous steel plate is larger than 0.02mm, the rolling force of the last two passes of the next steel plate is increased by 2 MN-6 MN; adjusting according to the method until the convexity of the steel plate is controlled to be 0.02-0.08 mm.
Further, in S2, the rolling force in the last two passes is controlled to be 20MN when the first 10-20 mm thick steel plate is rolled after the work rolls are replaced.
Furthermore, when the first steel plate with the thickness of 20mm < the thickness of less than or equal to 40mm is rolled after the working rolls are replaced in S3, the rolling force of the last two passes is controlled at 24.5 MN.
And further, the method is applied to the transverse thickness precision control of a steel plate with the thickness of 10-40 mm produced by a wide and thick plate flat roller mill.
The existing wide and thick plate rolling mill on wide and thick plates generally controls the convexity of a steel plate by setting a proper roll shape and utilizing a bending roll, and the convexity of the steel plate can be easily controlled by the proper roll shape and the bending roll through a plate shape software control system. The transverse thickness precision of the steel plate is high.
In the prior wide and thick plate flat roll mill, the roll shape is flat, so that the difficulty of effectively controlling the convexity of a steel plate is high, particularly under the condition of no roll bending. The crown of the flat rolling mill is controlled only through proper pass load distribution, if the rolling force of each pass is small, the crown of the steel plate is favorably controlled, but the number of passes of the rolled steel plate is large, so that deformation is difficult to permeate into the center of the steel plate due to small rolling reduction, the structure of the steel plate is uneven, and the mechanical property of the steel plate is influenced; secondly, because the number of rolling passes is large, the rolling time of each piece of steel is long, and the production efficiency of the rolling mill is low. If the rolling force of each pass is large, although the rolling reduction of each pass is large, the rolling pass frequency of each steel is small, the production efficiency of the rolling mill is high, but the convexity of the steel plate is large, the wave shape is serious, and the steel plate can be finally rejected because the flatness exceeds the standard. The invention controls the plate shape by limiting the rolling force of the last two passes of rolling one steel plate, thereby effectively controlling the convexity of the steel plate, keeping higher production efficiency of the rolling mill and simultaneously not influencing the mechanical property of the steel plate.
After the invention is adopted, the flat rolling mill can also effectively control the convexity of the steel plate, and the transverse thickness precision of the steel plate is greatly improved. After the method is adopted, the steel plate has excessive flatness due to unreasonable convexity control, and the waste content is reduced by more than 95% compared with the prior art. The transverse thickness precision of the steel plate is ensured to meet the requirement.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the method can effectively control the convexity of the steel plate and ensure that the transverse thickness precision of the steel plate meets the requirement.
2. The method of the invention does not need a special roll shape and a special plate shape software control system, does not need additional investment, and is easy to realize in actual production.
3. The method is simple to operate, is easy to realize in field production operation, and is convenient to popularize and apply.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
And (4) replacing the working rolls, rolling a first steel plate with the thickness of 10mm, and controlling the rolling force of the last two passes to be 18 MN. The convexity of the first steel plate after rolling is-0.03 mm; when a second steel plate with the thickness of 10mm is rolled, the rolling force of the last two times is increased by 6MN on the basis of the first steel plate, namely the rolling force of the last two times of rolling the second steel plate with the thickness of 10mm is 24MN, the convexity of the second steel plate after rolling is 0.035mm, and the requirement that the convexity of the steel plate is 0.02-0.08 mm is met. The rolling force of the last two passes of the second and later steel plates with the same thickness specification is 24MN, and the convexity of the rolled steel plates can meet the requirement.
Example 2
And (4) replacing the working rolls, rolling a first finished steel plate with the thickness of 20mm, and controlling the rolling force of the last two passes to be 22 MN. The convexity of the first steel plate after rolling is-0.04 mm; when a second steel plate with the thickness of 20mm is rolled, the rolling force of the last two times is increased by 6MN on the basis of the first steel plate, namely the rolling force of the last two times of rolling the second steel plate with the thickness of 20mm is 24MN, and the convexity of the second steel plate after rolling is 0.018 mm; when a third finished steel plate with the thickness of 20mm is rolled, the rolling force of the last two passes is increased by 2MN on the basis of the second finished steel plate, namely the rolling force of the last two passes of the third finished steel plate with the thickness of 20mm is 26MN, the convexity of the second finished steel plate is 0.037mm, and the requirement that the convexity of the steel plate is between 0.02 and 0.08mm is met. And the rolling force of the last two passes of the third and the following steel plates with the same thickness specification is 26MN, and the convexity of the rolled steel plates can meet the requirement.
Example 3
And (4) replacing the working rolls, rolling a first steel plate with the thickness of 10mm, and controlling the rolling force of the last two passes to be 22 MN. The convexity of the first steel plate after rolling is 0.11 mm; when a second steel plate with the thickness of 20mm is rolled, the rolling force of the last two passes is reduced by 6MN on the basis of the first steel plate, namely the rolling force of the last two passes of the second steel plate with the thickness of 20mm is 18MN, the convexity of the second steel plate after rolling is 0.046mm, and the requirement that the convexity of the steel plate is 0.02-0.08 mm is met. The rolling force of the last two passes of the second and later steel plates with the same thickness specification is 18MN, and the convexity of the rolled steel plates can meet the requirement.
Example 4
And (4) replacing the working rolls, rolling a first finished steel plate with the thickness of 20mm, and controlling the rolling force of the last two passes to be 22 MN. The convexity of the first steel plate after rolling is 0.12 mm; when a second steel plate with the thickness of 20mm is rolled, the rolling force of the last two times is reduced by 2MN on the basis of the first steel plate, namely the rolling force of the last two times of rolling the second steel plate with the thickness of 20mm is 20MN, and the convexity of the second steel plate after rolling is 0.0105 mm; and when a third finished steel plate with the thickness of 20mm is rolled, the rolling force of the last two times is reduced by 4MN on the basis of the second finished steel plate, namely the rolling force of the last two times of rolling the third finished steel plate with the thickness of 20mm is 16MN, and the finished convexity of the third steel plate is 0.06mm, so that the requirement that the convexity of the steel plate is between 0.02 and 0.08mm is met. The rolling force of the last two passes of the third and the following steel plates with the same thickness specification is 16MN, and the convexity of the rolled steel plates can meet the requirement.
Example 5
And (4) replacing the working rolls, rolling a first finished steel plate with the thickness of 16mm, and controlling the rolling force of the last two passes to be 21 MN. The convexity of the first steel plate after rolling is 0.11 mm; when a second steel plate with the thickness of 20mm is rolled, the rolling force of the last two times is reduced by 2.5MN on the basis of the first steel plate, namely the rolling force of the last two times of rolling the second steel plate with the thickness of 16mm is 18.5MN, and the convexity of the second steel plate after rolling is 0.086 mm; when a third steel plate with the thickness of 16mm is rolled, the rolling force of the last two passes is reduced by 4.5MN on the basis of the second steel plate, namely the rolling force of the last two passes of the third steel plate with the thickness of 16mm is 14MN, and the convexity of the rolled third steel plate is 0.052mm, so that the requirement that the convexity of the steel plate is between 0.02 and 0.08mm is met. The rolling force of the last two passes of the third and the following steel plates with the same thickness specification is 14MN, and the convexity of the rolled steel plates can meet the requirement.
Example 6
And (4) replacing the working rolls, rolling a first finished steel plate with the thickness of 40mm, and controlling the rolling force of the last two passes to be 23 MN. The convexity of the first steel plate after rolling is-0.025 mm; when a second steel plate with the thickness of 40mm is rolled, the rolling force of the last two passes is increased by 6MN on the basis of the first steel plate, namely the rolling force of the last two passes of the second steel plate with the thickness of 40mm is 29MN, the convexity of the second steel plate after rolling is 0.042mm, and the requirement that the convexity of the steel plate is 0.02-0.08 mm is met. The rolling force of the last two passes of the second and later steel plates with the same thickness specification is 29MN, and the convexity of the rolled steel plates can meet the requirement.
Example 7
And (4) replacing the working roller, rolling a first finished steel plate with the thickness of 35mm, and controlling the rolling force of the last two passes to be 25 MN. The convexity of the first steel plate after rolling is 0.016 mm; when a second steel plate with the thickness of 35mm is rolled, the rolling force of the last two passes is increased by 2MN on the basis of the first steel plate, namely the rolling force of the last two passes of the second steel plate with the thickness of 35mm is 27MN, the convexity of the second steel plate after rolling is 0.034mm, and the requirement that the convexity of the steel plate is 0.02-0.08 mm is met. The rolling force of the last two passes of the second and later steel plates with the same thickness specification is 27MN, and the convexity of the rolled steel plates can meet the requirement.
Example 8
And (4) replacing the working rolls, rolling a first finished steel plate with the thickness of 30mm, and controlling the rolling force of the last two passes to be 26 MN. The convexity of the first steel plate after rolling is 0.12 mm; when a second finished product of a steel plate with the thickness of 30mm is rolled, the rolling force of the last two passes is reduced by 2MN on the basis of the first finished product, namely the rolling force of the last two passes of the second finished product of the steel plate with the thickness of 30mm is 24MN, the rolled convexity of the second steel plate is 0.095mm, when a third finished product of the steel plate with the thickness of 30mm is rolled, the rolling force of the last two passes of the second finished product of the steel plate is reduced by 3.5MN on the basis of the second finished product of the steel plate, namely the rolling force of the last two passes of the third finished product of the steel plate with the thickness of 30mm is 20.5MN, and the rolled convexity of the third steel plate is 0.055mm, so that the requirement that the convexity of the steel plate is 0.02-. The rolling force of the last two passes of the third and the following steel plates with the same thickness specification is 20.5MN, and the convexity of the rolled steel plates can meet the requirement.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A method for controlling the transverse thickness precision of a wide and thick plate flat roller mill is characterized by comprising the following steps:
s1, controlling the convexity of the steel plate to be 0.02-0.08 mm;
s2, rolling a first steel plate with the thickness of 10-20 mm after the working roll is replaced, controlling the rolling force of the last two passes between 18-22 MN, adjusting the rolling force of the last two passes of the next steel plate according to the actual convexity value of the previous steel plate, and reducing the rolling force of the last two passes of the next steel plate by 2 MN-6 MN if the convexity value of the previous steel plate is larger than 0.08 mm; if the convexity value of the previous steel plate is larger than 0.02mm, the rolling force of the last two passes of the next steel plate is increased by 2 MN-6 MN; adjusting according to the method until the convexity of the steel plate is controlled to be 0.02-0.08 mm;
s3, rolling a first steel plate with the thickness of 20mm < 40mm after the working roller is replaced, controlling the rolling force of the last two passes between 23 and 26MN, adjusting the rolling force of the last two passes of the next steel plate according to the actual convexity value of the previous steel plate, and reducing the rolling force of the last two passes of the next steel plate by 2MN to 6MN if the convexity value of the previous steel plate is greater than 0.08 mm; if the convexity value of the previous steel plate is larger than 0.02mm, the rolling force of the last two passes of the next steel plate is increased by 2 MN-6 MN; adjusting according to the method until the convexity of the steel plate is controlled to be 0.02-0.08 mm.
2. The method of claim 1, wherein the rolling force of the last two passes is controlled to 20MN when the first 10 to 20mm thick steel plate is rolled after the work rolls are replaced in S2.
3. The method of claim 1, wherein the rolling force of the last two passes is controlled to be 24.5MN when rolling the first steel plate with a thickness of 20mm < 40mm after changing the work rolls in S3.
4. The method for controlling the transverse thickness precision of the wide and thick plate flat rolling mill according to claim 1, which is applied to the wide and thick plate flat rolling mill for producing a steel plate with the thickness of 10-40 mm.
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| CN111451292A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Method for controlling transverse thickness precision of 1000 MPa-grade cold-rolled dual-phase steel |
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