CN115475840A - Hot-rolled strip steel edge drop control method adaptive to deviation - Google Patents
Hot-rolled strip steel edge drop control method adaptive to deviation Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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Abstract
A hot-rolled strip steel edge drop control method adapting to deviation belongs to the field of steel rolling process control. According to the method, on-site actual data and rolling process parameters are combined, an ASR roll shape curve is adopted for the end parts of the lower working rolls of an F5 frame and an F6 frame of a finishing mill group to form a tapered section of the ASR working rolls, a roll shifting strategy adapting to the deviation of strip steel is adopted to avoid the box-shaped uneven wear of the working rolls, the smoothness and adjustability and controllability of the shape of a roll gap with a load are kept, the good control effect on the edge drop of the hot rolled strip steel is achieved, the use times of the rolls within the service life are increased, and the rolling mill has stronger edge drop control capability. The method can avoid the uneven box-shaped abrasion of the working roll, can keep the smoothness, adjustability and controllability of the shape of the loaded roll gap, enhances the control stability of the edge drop and abrasion control section, and achieves good control effect on the edge drop of the hot rolled strip steel; increasing the number of uses within the service life of the roll.
Description
Technical Field
The invention belongs to the field of steel rolling process control, and particularly relates to a method for controlling a plate shape.
Background
Firstly, the problem of edge drop of hot-rolled strip steel is one of the main quality problems concerned by downstream users, in particular to users of cold-rolled products such as electrical steel, fine blanking steel for automobile seats and the like. Taking a non-oriented electrical steel user as an example, because the production process is used in a mode of splitting finished product strip steel and re-laminating stamped steel, the larger the lamination height is, the higher the requirements on the thickness difference and the plate shape of the material are. During lamination, the thickness difference of materials can be accumulated, and finally the heights of the two sides of the part are inconsistent and the part cannot pass through a flow line to be produced, so that the continuous production process is interrupted.
Therefore, the electrical steel user puts forward a strict same plate difference requirement on a cold-rolled finished product, and reflects the requirement to a cold-rolled raw material coil-hot-rolled strip steel, and the edge drop control of the cold-rolled raw material coil-hot-rolled strip steel is very critical. Particularly, under the condition of intense market competition at present, no matter the cold rolling process or the final user, in order to improve the yield, a process of cutting edges slightly or not is adopted in the production process, if the edge of the hot rolled strip steel is excessively reduced, the edge area cannot be effectively cut off in the cold rolling production process, and the final user can be influenced by the fact that the end user can be subjected to lamination obstacles in the using process of the user after the strip division.
Secondly, according to the field investigation on a certain hot continuous rolling production line, the strip steel is always deviated in the rolling process of a finishing mill group, and the deviation amount is not constant, which increases the difficulty for the edge drop control of the hot rolled strip steel, so that a feasible edge drop control method is provided according to the deviation condition, thereby improving the quality of the plate shape.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hot-rolled strip steel edge drop control method suitable for deviation. According to the actual deviation condition of the strip steel, the special roll shape curve design and the special roll shifting mode are adopted at the end parts of working rolls of F5 and F6 frame rolling mills of a finishing mill group to avoid the uneven box-shaped abrasion of the working rolls, so that the smoothness, adjustability and controllability of the shape of a loaded roll gap are kept, the good control effect on the edge drop of the hot rolled strip steel is achieved, and the rolling mill has stronger edge drop control capability.
The technical scheme of the invention is as follows: the edge drop control method of the hot-rolled strip steel adapting to deviation is characterized by comprising the following steps:
according to the method, the end parts of the lower working rolls of the F5 frame and the F6 frame of the finishing mill set are curved in an ASR roll shape by combining field actual data and rolling process parameters to form a tapered section of the ASR working rolls, a roll shifting strategy adapting to the deviation of the strip steel is adopted to avoid the box-shaped uneven wear of the working rolls, the smoothness and adjustability and controllability of the shape of a roll gap with a load are kept, the good control effect on the edge drop of the hot rolled strip steel is achieved, the use times of the rolls in the service life are increased, and the rolling mill has stronger edge drop control capability.
Specifically, the end parts of the lower working rolls of the F5 frame and the F6 frame of the finishing mill group adopt an ASR roll shape curve, wherein the ASR roll shape curve is adopted on the transmission side of the working rolls on the F5 frame, and the ASR roll shape curve is adopted on the operation side of the working rolls on the F6 frame; and for the lower working roll of the F5 frame and the lower working roll of the F6 frame, a roll matching scheme of a flat roll shape is adopted.
Specifically, the ASR roll-shape curve is a roll-shape curve of the end part of the working roll generated based on an asymmetric self-compensation working roll technology; the ASR roll-shape curve comprises a convexity control section L 1 Wear control section L 2 And a structural process section L 3 (ii) a Wherein, the convexity control section L 1 For ensuring that the rolling contact zone is in a flat rolling position, said wear control section L 2 And a structural process section L 3 Tapered segment L forming an ASR work roll e (ii) a Tapered section L of the ASR work roll e Is equal to the wear control section L 2 And a structural process section L 3 The sum of the lengths of (a) and (b), i.e.: l is e ＝L 2 +L 3 。
Further, a convexity control section L in the ASR roll-shape curve 1 Adopting a flat roller shape, the length of which is as follows:
in the formula, L W Is the length of the working roll, B is the width of the strip steel, L S The initial deflection position of the working roll of the strip steel with the rolling reference width is set;
the ASR roll shape curve describes the wear control segment L using the following polynomial 2 Roll shape curve of (2):
y＝a 2 (x-L 1 ) 2 +a 4 (x-L 1 ) 4 +a 6 (x-L 1 ) 6 (L 1 ＜x＜L 1 +L 2 )
L 2 ＝S end -S st
in the formula, a 2 、a 4 、a 6 Compensating the characteristic coefficient of the curve; s st The arrangement position of the working roll when rolling the first strip steel; s end The arrangement position of the working roll when rolling the last strip steel;
in the ASR roll-shape curve, the structural process section L is arranged 3 The grinding amount of the roller is reduced, the simple and easy grinding of the whole roller shape is ensured, and the grinding precision of the roller is ensured.
Specifically, when the main material is rolled, the roll shifting strategy adapting to the deviation of the strip steel comprises the following steps:
(1) Setting different initial roll shifting positions according to different strip steel widths, so that the side edge of a first coil of steel is superposed with the end point of the conical section of the asymmetric self-compensation working roll when the hot-rolled strip steel with different widths is rolled;
(2) The roll shifting strategy is divided into roll shifting rhythm and roll shifting step length;
(3) The unit rolling quantity is determined by the roll shifting stroke and the roll shifting strategy and is expressed as follows:
wherein R is roll shifting rhythm; t is the step length of roll shifting, and n is the number of rolled strip steel coils in the rolling period.
Further, the roll shifting rhythm is generally R =1, namely, when one roll of main material is rolled and shifted once, the roll shifting step length is
Specifically, when the hot rolling material is rolled, the roll shifting strategy for adapting to the deviation of the strip steel comprises the following steps:
(1) The roll shifting is not carried out when the first ironing roll material is rolled, and the subsequent ironing roll material is uniformly shifted to the first roll shifting position of the main material;
(2) And after the roller ironing is finished, the temperature field of the working roller and the shape of the hot roller are established, the roller is placed to the deflection position, and the main material rolling is started.
Further, the hot-rolled strip steel edge drop control method adapting to deviation adjusts the initial roll shifting amount of the F5 and F6 frames according to the actual deviation amount of the strip steel, so that the side edge of the first rolled steel is overlapped with the end point of the conical section of the asymmetric self-compensation working roll.
Furthermore, in the actual rolling process, the roll shifting step length is adjusted according to the deviation and the plate profile of the strip steel so as to obtain a good plate shape.
Compared with the prior art, the invention has the advantages that:
1. according to the technical scheme, the roll shape curves and the configuration modes of the working rolls of the frames F5 and F6 of the finishing mill set are improved by combining field actual data and rolling process parameters, and a roll shifting strategy adaptive to the deviation of strip steel is adopted, so that the uneven abrasion of the box type of the working rolls can be avoided;
2. after the technical scheme is adopted, the smoothness, adjustability and controllability of the shape of the on-load roll gap can be kept, and a good control effect on the edge drop of the hot rolled strip steel is achieved;
3. by implementing the technical scheme, on one hand, the smoothness of the whole roll-shaped curve can be ensured, and the control stability of the edge drop and abrasion control section is enhanced; on the other hand, the integral roll diameter difference of the roll shape can be reduced to the greatest extent, the roll shape is ensured to be simple and easy to grind, the total grinding quantity of the roll is reduced, the use times of the roll in the service life are increased, and the rolling mill has stronger edge drop control capability.
Drawings
FIG. 1 is a schematic view of the roll configuration of F5 and F6 frame work rolls;
FIG. 2 is a schematic view of an ASR roll form;
FIG. 3 is a schematic diagram showing the positional relationship between the ASR working rolls and the backup rolls and the strip steel at the start of rolling;
FIG. 4 is a schematic representation of a polynomial coordinate system position;
FIG. 5 is a schematic view of the roll profile of the work rolls on the F5 frame;
fig. 6 is a schematic view of the roll profile of the work rolls on the F6 frame.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
According to the technical scheme, the special roll shape curve design and the special roll shifting mode of the end part of the working roll are adopted by the F5 and F6 frame rolling mills of the finishing mill group according to actual deviation of the strip steel, so that the box-shaped uneven abrasion of the working roll is avoided, the smoothness, adjustability and controllability of the shape of the loaded roll gap are kept, the good control effect on the edge drop of the hot rolled strip steel is achieved, and the rolling mill has stronger edge drop control capability.
The special roll shape curve design at the end part of the working roll refers to an asymmetric Self-compensating working roll technology (ASR technology for short), and the invention of the specific technical scheme is as follows:
(1) The end part of the working roll adopts a special roll shape curve:
and the roll shape curves and the configuration modes of the working rolls of the frames F5 and F6 of the finishing mill group are developed and designed by combining field actual data and rolling process parameters.
1) The configuration mode is as follows:
considering that the strip steel is off tracking and the upper and lower working rolls of the frame can not independently move, an end curve is designed on only one working roll of the F5 and F6 frames.
By measuring the abrasion conditions of the working rolls of the F5 and F6 frames on site, the upper working roll is found to be abraded more than the lower working roll, the abrasion of the transmission side of the working roll is more than that of the operation side, the average value of the abrasion conditions of the F5 frame and the F6 frame is similar, and no obvious rule exists. Therefore, the roll shape with the larger wear part adopts the ASR roll shape, namely the transmission side of the working roll on the F5 frame adopts the ASR roll shape, the operation side of the working roll on the F6 frame adopts the ASR roll shape, and the working roll under the F5 and the working roll under the F6 adopt the roll matching scheme of the flat roll shape.
2) Designing a roll shape curve:
the roll shape of the ASR working roll has three sections of curves, L 1 The segment is a convexity control segment, L 2 The section being a wear control section, L 3 The section is a structural process section.
(1) Convexity adjusting section L 1 ：
In the production of strip steel, the change of the roll shapes of a working roll and a supporting roll is one of the main factors influencing the strip shape. The initial roll shape of the conventional crown work roll is simple, and the shape of the conventional crown work roll is generally a sine and cosine function.
According to the technical scheme, the problem of symmetry factors is considered, when rolling is started, the hot convexity roll shape is not completely built, the roll shape is just worn, and for ensuring that a rolling contact area is in a flat rolling position, a flat roll shape is adopted for an L1 section.
The design principle of the asymmetrical self-compensating working roll convexity adjusting section is to ensure that the maximum roll shifting stroke of a roll is well utilized in the rolling process. When the asymmetrical self-compensating work roll is used, the position of the initial part of the conical section of the asymmetrical self-compensating work roll, which is aligned with the edge of the strip steel, is specified as a zero position. According to the above analysis, the length of the crown adjustment segments is:
in the formula L W Is the length of the working roll, mm;
b is the width of the strip steel, mm;
L S the initial deflection position of the strip steel working roll with the rolling reference width is mm;
for a finishing train with a roll length of 1580mm, L W Is 1880mm.
(2) Edge drop and wear control segment L 2 ：
The technical principle of the asymmetric self-compensation working roll is that the worn U-shaped side of the roll is skillfully compensated through the specially designed roll shape, so that strip steel is positioned in the flat range of an upper working roll and a lower working roll in the rolling process, and meanwhile, the bearing roll gap shape is controlled through strong roll bending force.
The design of the conical section of the non-automatic self-compensation working roll is a key part of the non-automatic self-compensation working roll, because the part is the core for controlling the abrasion of the working roll of the hot continuous rolling downstream frame and the convexity of the strip steel.
According to the design principle of the asymmetric self-compensation working roll, in order to fully utilize the maximum roll shifting stroke of the rolling mill, the ASR roll-shaped conical section needs to ensure that the initial position is aligned with the edge of the strip steel and is used as the zero position of the roll shifting, and the position relation among the ASR working roll, the supporting roll and the strip steel at the beginning of rolling is shown in a figure 3.
From the geometrical relationships in FIG. 3, one can obtain
L e ＝L 2 +L 3 (5)
In the formulae (2) to (5), L e Comprises an edge drop and wear control section L 2 And a structural process section L 3 (ii) a B is the width of the strip steel, mm; l is w Taking L for the practical situation of combining the length of a working roll, mm and a 1580mm hot continuous rolling mill w ＝1880mm；L BUR Taking L for supporting the practical condition of the roller length, mm and combining 1580mm hot continuous rolling mill BUR ＝1580mm；L s Is the initial deflection position of the working roll, mm.
From the equation (4), the ASR work roll curve segment length L is determined when the strip width, the work roll length and the backup roll length are constant e Only with respect to the position of the initial runout of the work rolls.
According to the method, the current roll shifting stroke of a F5-F7 rack of a 1580mm hot continuous rolling finishing mill unit is +/-135 mm, the width of a current field normally-rolled electric steel hot-rolled strip steel plate is more than or equal to 900mm and less than or equal to 1300mm, and in order to fully utilize the maximum roll shifting stroke of a hot continuous rolling mill, le more than or equal to 425mm and less than or equal to 625mm can be obtained. In addition, considering that the maximum usable length of the tapered section of the work roll is 270mm, L is used to reduce the grinding amount of the roll e Should take the minimum value, i.e. L e ＝425mm。
The setting of the wear control section of the asymmetric self-compensation working roll is determined by the maximum roll shifting stroke of the rolling mill, and the strip steel is in the flat range of the working roll in the rolling process due to the fact that the asymmetric self-compensation working roll has an axial unidirectional irreversible roll shifting strategy and is matched with the special relation of the asymmetric self-compensation working roll. The most important function of the asymmetric self-compensating work roll curve segment is to counteract the wear of the work rolls during rolling.
When the roll profile of the roll occurs in polynomial form, the cnc grinding machine does not well achieve the set target for odd terms. Based on the technology of using the asymmetrical self-compensating working roll and combining the prior research results and the past experience, the technical scheme adopts the following polynomial to describe L 2 Segment roll shape curve.
y＝a 2 (x-L 1 ) 2 +a 4 (x-L 1 ) 4 +a 6 (x-L 1 ) 6 (L 1 ＜x＜L 1 +L 2 ) (6)
L 2 ＝S end -S st (7)
In the formula a 2 、a 4 、a 6 Compensating the characteristic coefficient of the curve;
S st the arrangement position of the working roll when rolling the first strip steel;
S end the arrangement position of the working roll when rolling the last strip steel.
Note: the origin of the coordinate system used in the formula is the initial position of the non-tapered roll section of the work roll, as shown in detail in FIG. 4.
And substituting the field original roll shape as the initial roll shape into the built working roll wear prediction model by taking the process parameters such as rolling plan compilation, roll shifting strategy and the like into consideration, and further obtaining the wear roll shape of the working roll. Finally, overlapping the initial roll shape and the worn roll shape of the working roll to obtain a comprehensive roll shape, and fitting by using the formulas (3) - (7) to determine a 2 、a 4 、a 6 The value of (c).
(3) Structural process section L 3 ：
The structural process section does not directly play a role in controlling the shape of the plate in the rolling process, and the design of the structural process section mainly aims to reduce the grinding amount of the roller as much as possible, ensure the simple and easy grinding of the whole roller shape and ensure the grinding precision of the roller.
y＝b 0 +b 1 (x-L 1 -L 2 )(L 1 +L 2 ＜x＜L W ) (8)
b 0 ＝a 0 +a 2 L 2 2 +a 4 L 4 2 +a 6 L 6 2 (9)
b 1 ＝2a 2 L 2 +4a 4 L 3 2 +6a 6 L 5 2 (10)
In the formula b 0 Is a roll shape continuity coordination coefficient;
b 1 i.e., the slope of the edge drop and wear control segment curves at the endpoints.
On edge drop and wear control section L 2 The end point of the roller is smoothed in a tangent mode on the end without actual control action, so that on one hand, the smoothness of the whole roller shape curve can be ensured, and the control stability of the edge drop and abrasion control section is enhanced; on the other hand, the integral roller diameter difference of the roller shape can be reduced to the greatest extent, the roller shape is simple and easy to grind, the grinding total amount of the roller is reduced, and the use times of the roller in the service life are increased.
According to the above design method and process, the roll profile is designed as shown in fig. 1 and fig. 2, and the characteristic parameters are shown in table 1.
TABLE 1 partial characteristic parameters/mm for ASR roll shape of F5 and F6 stands
| Coefficient value of | L w | L e | L 1 | L 2 | L 3 | a 2 | a 4 | a 6 |
| F5 frame | 1880 | 425 | 1455 | 270 | 155 | -1.75E-05 | 1.85E-10 | -1.01E-15 |
| F6 frame | 1880 | 425 | 1455 | 270 | 155 | -2.03E-05 | 2.15E-10 | -1.17E-15 |
Fig. 5 and 6 are ASR roll shape curves of the working rolls on the F5 frame and the F6 frame finally designed by the present technical solution.
(2) The roll shifting strategy adapting to the deviation of the strip steel is as follows:
the roll shifting parameters of the ASR working roll mainly comprise the maximum roll shifting stroke, the roll shifting step length and the roll shifting rhythm, and different roll shifting strategies can be obtained by selecting different roll shifting parameters. However, unlike the circular roll shifting strategy of the conventional convexity roll, the ASR working roll must shift in one direction during the rolling process until one rolling unit is finished.
1) Rolling of the main material:
the earlier research shows that when the strip steels with different widths are rolled, the grinding roll forms of the working rolls are the same, and the width of the grinding roll forms is increased along with the increase of the width of the strip steel, so that different initial roll shifting positions (roll shifting positions when the first strip steel is rolled) can be set according to the different strip steel widths.
The width range of the hot-rolled strip steel of the electrical steel rolled by a 1580 hot continuous rolling mill is 900mm-1300mm, and the roll shifting stroke of a finish rolling working roll is-135 mm- +135mm. The maximum target width is first selected as the reference width, bo =1300mm. Initial roll shifting position of the reference strip width (roll shifting position of the working roll when rolling the first roll of the reference width strip): the side edge of the first coil steel is coincided with the end point of the conical section of the asymmetrical self-compensation working roll when the hot-rolled strip steel with different widths is rolled.
And then, according to factors such as the actual deviation condition of the strip steel, the unit rolling quantity, the length of the roll shifting stroke and the like, a proper roll shifting strategy is formulated, so that the roll shifting stroke can be fully utilized by the hot-rolled strip steel with different widths.
The roll shifting strategy mainly comprises roll shifting rhythm and roll shifting step length, and the unit rolling quantity of a 1300mm target variety is designed to be 135 coils in order to enable strip steels of all width target varieties to meet production requirements by combining the actual conditions of a 1580 hot continuous rolling mill.
Due to the particularity of the roll shape of the asymmetrical self-compensating working roll, the unit rolling quantity is determined by the roll shifting stroke and the roll shifting strategy and can be expressed as
Wherein R is roll shifting rhythm;
t-step length of roll shifting, mm
n is the number of rolled strip steel coils in the rolling period.
Generally, the roll shifting rhythm is R =1, namely, when one roll of main material is rolled and shifted, the roll shifting step length is
The roll-to-roll step size of 1300mm was 2mm/step (mm/turn) as calculated by the above equation.
From the above analysis, it can be seen that different width target steel grades use the same roll shifting strategy. Meanwhile, the unit rolling quantity of different strip steel widths can be calculated, wherein the unit rolling quantity can meet the production requirements when 1200mm is 110 coils, 1100mm is 85 coils, 1000mm is 60 coils and 900mm is 35 coils.
2) Rolling the hot roller material:
aiming at a roller shifting strategy during rolling of hot roller materials, the following scheme is provided: and when the first ironing roller material is rolled, the roller shifting is not carried out, and the subsequent ironing roller material is uniformly shifted to the position of the first roller shifting of the main material.
And after the roller ironing is finished, the temperature field of the working roller and the shape of the hot roller are established, the roller is placed to the deflection position, and the main material rolling is started.
When the technical scheme is implemented, attention should be paid to:
(1) And adjusting the initial roll shifting amount of the F5 and F6 frames according to the actual deviation amount of the strip steel, so that the side edge of the rolled first coil steel is overlapped with the end point of the conical section of the asymmetric self-compensation working roll.
(2) In the actual rolling process, the roll shifting step length is adjusted according to the deviation and the plate profile of the strip steel so as to obtain a good plate shape.
Example (b):
the technology carries out an on-machine test on a certain 1580 unit, and production data shows that before the ASR technology is used, the reduction of the rolled strip steel, namely the proportion of C25-C40 which is less than or equal to 10um is 72%, while after the ASR technology is used, the reduction is effectively controlled, and the proportion of C25-C40 which is less than or equal to 10um is 90%.
The edge drop control capability of the ASR working roll is obviously better than that of the conventional crown working roll, and the strict requirement of a user on the edge drop of the hot-rolled strip steel is met.
TABLE 2 comparison of edge drop using ASR roll form front and back strip steels
The technical scheme of the invention is based on the technical principle of asymmetric self-compensating working rolls, improves the working roll shape curves and the configuration modes of the working roll shape curves of the frames F5 and F6 of the finishing mill group, adopts a roll shifting strategy adapting to the deviation of the strip steel, can avoid the uneven abrasion of the box shape of the working roll, keeps the smoothness, adjustability and controllability of the shape of the loaded roll gap, and achieves good control effect on the edge drop of the hot rolled strip steel; on one hand, the smoothness of the whole roll shape curve can be ensured, and the control stability of the edge drop and abrasion control section is enhanced; on the other hand, the integral roll diameter difference of the roll shape can be reduced to the greatest extent, the roll shape is simple and easy to grind, the total grinding amount of the roll is reduced, the use times of the roll in the service life are increased, and the rolling mill has stronger edge drop control capability.
The invention can be widely applied to the field of production process control of hot rolled strip steel.
Claims (9)
1. A hot-rolled strip steel edge drop control method adapting to deviation is characterized by comprising the following steps:
according to the method, the end parts of the lower working rolls of the F5 frame and the F6 frame of the finishing mill set are curved in an ASR roll shape by combining field actual data and rolling process parameters to form a tapered section of the ASR working rolls, a roll shifting strategy adapting to the deviation of the strip steel is adopted to avoid the box-shaped uneven wear of the working rolls, the smoothness and adjustability and controllability of the shape of a roll gap with a load are kept, the good control effect on the edge drop of the hot rolled strip steel is achieved, the use times of the rolls in the service life are increased, and the rolling mill has stronger edge drop control capability.
2. The deviation-adaptive hot-rolled strip edge drop control method according to claim 1, wherein the ASR roll shape curve is adopted for the end portions of the lower working rolls of the F5 stand and the F6 stand of the finishing mill group, and the ASR roll shape curve is adopted for the transmission side of the working rolls on the F5 stand and the ASR roll shape curve is adopted for the operation side of the working rolls on the F6 stand; and for the lower working roll of the F5 frame and the lower working roll of the F6 frame, a roll matching scheme of a flat roll shape is adopted.
3. The deviation-adaptive hot-rolled strip edge drop control method according to claim 1, wherein the ASR roll-shape curve is a working roll end roll-shape curve generated based on an asymmetric self-compensating working roll technology;
the ASR roll-shape curve comprises a convexity regulating and controlling section L 1 Wear control section L 2 And a structural process section L 3 ；
Wherein, the convexity control segment L 1 For ensuring that the rolling contact zone is in a flat rolling position, said wear control section L 2 And a structural process section L 3 Tapered segment L forming an ASR work roll e ；
Tapered section L of the ASR work roll e Is equal to the wear control section L 2 And a structural process section L 3 I.e.: l is e ＝L 2 +L 3 。
4. The deviation-adaptive hot-rolled strip edge drop control method according to claim 3, wherein a crown control section L in the ASR roll shape curve 1 Adopting a flat roller shape, the length of which is as follows:
in the formula, L W Is the length of the working roll, B is the width of the strip steel, L S The initial deflection position of the working roll of the strip steel with the rolling reference width is set;
the ASR roll profile curve uses the following polynomial to describe the wear control segment L 2 Roll shape curve of (2):
y＝a 2 (x-L 1 ) 2 +a 4 (x-L 1 ) 4 +a 6 (x-L 1 ) 6 (L 1 ＜x＜L 1 +L 2 )
L 2 ＝S end -S st
in the formula, a 2 、a 4 、a 6 Is a compensation curve characteristic coefficient; s. the st The arrangement position of the working roll when rolling the first strip steel; s end The arrangement position of the working roll when the last strip steel is rolled;
in the ASR roll-shaped curve, the structural process section L is arranged 3 The grinding amount of the roller is reduced, the simple and easy grinding of the whole roller shape is ensured, and the grinding precision of the roller is ensured.
5. The deviation-adaptive hot-rolled strip edge drop control method according to claim 1, wherein when the main material is rolled, the roll shifting strategy for the deviation of the strip steel comprises the following steps:
(1) Setting different initial roll shifting positions according to different strip steel widths, so that the side edge of a first coil of steel is superposed with the end point of the conical section of the asymmetric self-compensation working roll when the hot-rolled strip steel with different widths is rolled;
(2) The roll shifting strategy is divided into roll shifting rhythm and roll shifting step length;
(3) The unit rolling quantity is determined by a roll shifting stroke and a roll shifting strategy and is expressed as follows:
wherein R is the roll shifting rhythm; t is the step length of roll shifting, and n is the number of rolled strip steel coils in the rolling period.
6. The deviation-adaptive hot-rolled strip steel edge drop control method according to claim 5, wherein the roll shifting rhythm is generally R =1, namely when one roll of main material is rolled and shifted, the roll shifting step length is equal to
7. The deviation-adaptive hot-rolled strip steel edge drop control method according to claim 1, wherein when a hot roll material is rolled, the roll shifting strategy for adapting the deviation of the strip steel comprises the following steps:
(1) The roll shifting is not carried out when the first ironing roll material is rolled, and the subsequent ironing roll material is uniformly shifted to the first roll shifting position of the main material;
(2) And after the roller ironing is finished, the temperature field of the working roller and the shape of the hot roller are established, the roller is placed to the deflection position, and the main material rolling is started.
8. The deviation-adaptive hot-rolled strip edge drop control method as claimed in claim 1, wherein the deviation-adaptive hot-rolled strip edge drop control method is characterized in that the initial roll shifting amount of F5 and F6 racks is adjusted according to the actual deviation amount of the strip steel, so that the side edge of a first rolled steel coil is overlapped with the end point of the conical section of the asymmetric self-compensation working roll.
9. The deviation-adaptive hot-rolled strip edge drop control method according to claim 1, wherein in the actual rolling process, the roll shifting step length is adjusted according to the deviation and the strip profile so as to obtain a good strip shape.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116140376A (en) * | 2023-02-15 | 2023-05-23 | 北京科技大学 | Roll shifting setting method for wear compensation roll shape of hot rolling working roll |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116140376A (en) * | 2023-02-15 | 2023-05-23 | 北京科技大学 | Roll shifting setting method for wear compensation roll shape of hot rolling working roll |
| CN116140376B (en) * | 2023-02-15 | 2024-02-20 | 北京科技大学 | Roll shifting setting method for wear compensation roll shape of hot rolling working roll |
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