Control method of CVC rolling mill, CVC rolling mill and storage medium

Abstract

The present application discloses a control method for a CVC rolling mill, a CVC rolling mill and a storage medium. The method comprises: obtaining rolling process parameters corresponding to a strip, a roll of strip is cut to form a plurality of slabs; obtaining a processing order of a first slab in the strip, the plurality of slabs including the first slab; calculating a target convexity value corresponding to the first slab according to the processing order and the rolling process parameters; controlling the first roller and the second roller which are relatively arranged to move relative to each other along a third direction according to the target convexity value, and rolling the first slab at the target convexity value. The control method for a CVC rolling mill, a CVC rolling mill and a storage medium provided in the embodiments of the present application can avoid serious local uneven wear of the rollers due to the excessive concentration of the roller shifting positions.

Description

Technical Field

[0001] The present application belongs to the field of rolling mills, and in particular to a control method of a CVC rolling mill, a CVC rolling mill and a storage medium. Background Art

[0002] CVC mill (Continuous Variable Crown) is a mill that can effectively control the plate shape. CVC mill processes the work roll surface into an S-shaped bottle-like structure. Two work rolls are set at intervals on the mill. The work rolls can move along the axial direction of the work rolls, and positive and negative roll gap convexities are formed between the two work rolls. By moving the work rolls along the axial direction, the positive and negative roll gap convexities can be changed to achieve the purpose of controlling the flatness and convexity of the strip. The movement of the work rolls along the axial direction is called roll shifting. During the slab rolling process, for continuously rolled slabs of the same cross-sectional specifications, the work rolls are in a relatively stable state due to thermal expansion, and the movement of the work rolls along the axial direction will be reduced. The position of the work roll movement will be concentrated in a fixed range with a small amount of fluctuations, causing uneven wear of the work rolls in the corresponding area. Summary of the invention

[0003] The embodiments of the present application provide a control method for a CVC rolling mill, a CVC rolling mill and a storage medium, which can avoid the technical problem of local uneven wear of the rollers due to excessive concentration of roller shifting positions.

[0004] In a first aspect, an embodiment of the present application provides a control method for a CVC rolling mill, which is applied to the CVC rolling mill. The CVC rolling mill includes a first roller and a second roller spaced apart along a first direction, and the first roller and the second roller are used to roll a slab and drive the slab to move along a second direction. The method includes the following steps:

[0005] Obtain rolling process parameters corresponding to the strip, and cut a roll of strip into multiple slabs;

[0006] obtaining a processing order of a first slab in the strip, wherein the plurality of slabs include the first slab;

[0007] Calculating a target convexity value corresponding to the first slab according to the processing sequence and rolling process parameters;

[0008] According to the target convexity value, the first rolling roller and the second rolling roller which are arranged opposite to each other are controlled to move relatively along the third direction, so as to roll the first slab at the target convexity value.

[0009] According to the implementation of the first aspect of the present application, the rolling process parameters include at least a preset crown value, a crown upper limit value, a crown lower limit value and a first preset constant, and the target crown value corresponding to the first slab is calculated according to the processing sequence and the rolling process parameters, including:

[0010] A first parameter is obtained by calculating the upper limit value of the convexity, the lower limit value of the convexity and a first preset constant;

[0011] Calculate a first adjustment value according to the first parameter and the processing order;

[0012] A second adjustment value is obtained by calculation based on the processing order and the remainder of the second preset constant;

[0013] The target convexity value is calculated based on the preset convexity value, the first adjustment value, the convexity upper limit value, the convexity lower limit value and the second adjustment value.

[0014] According to any of the aforementioned implementations of the first aspect of the present application, the target convexity value is calculated according to the preset convexity value, the first adjustment value, the convexity upper limit value, the convexity lower limit value and the second adjustment value, including:

[0015] When the processing order is less than or equal to the first preset constant, the target convexity value is equal to the sum of the preset convexity value, the first adjustment value, the convexity lower limit value and the second adjustment value;

[0016] When the processing order is greater than the first preset constant, the target convexity value is equal to the sum of the preset convexity value, the convexity upper limit value and the second adjustment value.

[0017] According to any of the aforementioned implementations of the first aspect of the present application, the first parameter is calculated according to the convexity upper limit value, the convexity lower limit value and the first preset constant, including:

[0018] Calculate the difference between the upper convexity value and the lower convexity value;

[0019] The quotient of the difference and the first preset constant is calculated, and the quotient is the first parameter.

[0020] According to any of the aforementioned implementations of the first aspect of the present application, calculating the first adjustment value according to the first parameter and the processing order includes:

[0021] The product of the first parameter and the processing order is calculated, and the product is the first adjustment value.

[0022] According to any of the aforementioned implementations of the first aspect of the present application, the second adjustment value is calculated according to the following formula:

[0023] ΔC=(-1+r1)*m, or ΔC=(-2+r2)*m

[0024] Wherein, ΔC is the second adjustment value, r1 is the remainder of the processing order divided by 3, r2 is the remainder of the processing order divided by 5, and m is a constant, 0.001≤m≤0.005.

[0025] According to any of the aforementioned embodiments of the first aspect of the present application, the rolling process parameters further include a preset bending roll intervention value; after the target convexity value is calculated according to the processing sequence and the rolling process parameters, it also includes:

[0026] The target bending roll intervention value is calculated based on the preset bending roll intervention value and processing sequence;

[0027] The bending roll force applied to the first roll and the second roll is controlled according to the target bending roll intervention value.

[0028] According to any of the aforementioned embodiments of the first aspect of the present application, the target bending roll intervention value varies periodically with the processing order.

[0029] According to any of the aforementioned embodiments of the first aspect of the present application, the target bending roll intervention value is calculated according to the following formula:

[0030] force bendadd =force oper -(-1+r1)*p,

[0031] or force bendadd =force oper -(-2+r2)*p

[0032] Among them, force bendadd is the target bending roll intervention value, force oper is the preset bending roll intervention value, r1 is the remainder of the processing order divided by 3, r2 is the remainder of the processing order divided by 5, and p is a constant, 50≤p≤200.

[0033] In a second aspect, an embodiment of the present application provides a CVC rolling mill, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, and when the program or instruction is executed by the processor, the steps of the control method as described in any one of the first aspects above are implemented.

[0034] In a third aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the control method as described in any one of the first aspects are implemented.

[0035] The control method, CVC mill and storage medium of the embodiment of the present application calculate the target convexity value of the first slab according to the process parameters such as the preset convexity value, the upper limit value of convexity, the lower limit value of convexity and the first preset constant, and the processing order of the first slab, and control the relative movement of the first roller and the second roller along the third direction according to the target convexity value to control the straightness and convexity of the rolled slab. By calculating the target convexity value for slabs with different processing orders, the first roller and the second roller set relatively can be controlled to roll the first slab with the calculated target convexity value, so that the first roller and the second roller can shift the roller back and forth, so as to achieve the purpose of dispersing the shifting roller position, avoid the first roller and the second roller from having serious local uneven wear due to the over-concentration of the shifting roller position, and extend the rolling mileage of the first roller and the second roller. At the same time, it avoids the local high point defects and poor plate shape problems of the slab, and improves the plate shape control ability of the CVC mill for rolling the slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 A schematic flow chart of a control method for a CVC rolling mill according to an embodiment of the first aspect of the present application;

[0038] Figure 2 A partial flow chart of a control method for a CVC rolling mill according to an embodiment of the first aspect of the present application;

[0039] Figure 3 A schematic flow chart of another CVC rolling mill control method according to an embodiment of the first aspect of the present application;

[0040] Figure 4 A schematic structural diagram of a CVC rolling mill provided in accordance with an embodiment of the second aspect of the present application;

[0041] Figure 5 A line chart showing changes in target convexity values ​​corresponding to multiple slabs of the same strip;

[0042] Figure 6 The curve diagram of roll shifting value for the same plan corresponding to six different grades rolled according to the preset crown value;

[0043] Figure 7 A curve diagram of roll shifting value for the same plan corresponding to six different grades rolled according to the CVC rolling mill control method provided in this application;

[0044] Figure 8The cross-sectional thickness curve of the 80th slab rolled according to a preset crown value in a certain plan;

[0045] Fig. 9 This is a cross-sectional thickness curve diagram of the 80th slab rolled in a certain plan according to the control method of the CVC rolling mill provided in this application. DETAILED DESCRIPTION

[0046] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0048] The CVC mill is a mill that can effectively control the plate shape. The CVC mill processes the work roll surface into an S-shaped bottle-like structure. The two work rolls are spaced apart on the mill and arranged at 180° to each other. The work rolls can move along the axial direction of the work rolls, and positive and negative roll gap convexities are formed between the two work rolls. The purpose of controlling the flatness and convexity of the strip is achieved by moving the work rolls along the axial direction. The movement of the work rolls along the axial direction is called roll shifting. During the slab rolling process, for continuously rolling slabs of the same cross-sectional specifications, the work rolls are in a relatively stable state due to thermal expansion, and the movement of the work rolls along the axial direction will be reduced. The position of the work roll movement will be concentrated in a fixed position range with a small amount of fluctuation, causing uneven wear of the work rolls in the corresponding area.

[0049] To solve the above problems, an embodiment of the present application provides a control method for a CVC rolling mill, which can disperse the shifting positions of the first roller and the second roller, thereby avoiding serious local uneven wear of the first roller and the second roller due to excessive concentration of the shifting positions, thereby extending the rolling mileage of the CVC rolling mill.

[0050] The control method of the CVC rolling mill provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0051] The first aspect of the present application provides a control method for a CVC mill, which is applied to the CVC mill. The CVC mill includes a first roller and a second roller arranged at intervals along a first direction, and the first direction can be a vertical direction or can be arranged at a certain angle to the vertical direction. The first roller and the second roller are used to roll the slab and drive the slab to move along the second direction, and the first direction and the second direction intersect. The first roller and the second roller can move relative to each other along their axial directions to adjust the gap size between the first roller and the second roller to form positive and negative roll gap convexity. Since the axial movement distance of the first roller and the second roller can be continuous, a continuously changing roll gap convexity can be formed. The CVC mill can be a six-roll CVC mill or a four-roll CVC mill, and at least two of the rollers in the six-roll CVC mill and the four-roll CVC mill are working rollers, namely the first roller and the second roller, and the remaining rollers are support rollers or drive rollers.

[0052] Please refer to Figure 1 , the control method of the CVC rolling mill may include the following steps:

[0053] S1, obtaining rolling process parameters corresponding to the strip, and cutting a roll of strip into multiple slabs;

[0054] The rolling process parameters are all preset parameters, among which the preset convexity value can be obtained from the MES (Manufacturing Execution System) system. The preset convexity value is formulated by the process personnel according to customer requirements or process system and is pre-stored in the MES system. Exemplarily, the preset convexity value can be pre-determined based on the range of convexity values ​​of the plate required by the customer and the convexity range that the CVC rolling mill can achieve in actual production. The convexity upper limit value, the convexity lower limit value and the first preset constant are pre-set by the process personnel according to the slab performance parameters and made into a configuration table, which can be pre-stored in the control system of the CVC rolling mill. When rolling the slab, the corresponding convexity upper limit value, the convexity lower limit value and the first preset constant can be directly obtained from the configuration table according to the identification mark of the slab to be rolled with the same standard plan. The identification mark can be the brand of the slab, and each brand corresponds to the determined slab width and thickness parameters, as well as the rolling process parameters. Among them, some configuration tables are shown in the following table:

[0055]

[0056] The continuously rolled slabs may be slabs of the same specification plan, the slabs of the same specification plan have the same brand, and the thickness and width of the slabs fluctuate within the corresponding preset range, that is, the thickness and width of multiple slabs in the same specification plan do not vary much. Optionally, the slabs of the same specification plan are slabs whose width and thickness simultaneously meet the following four conditions: the thickness difference between two consecutive slabs does not exceed 1mm; the difference between the maximum thickness and the minimum thickness of the slab does not exceed 3mm; the width difference between two consecutive slabs does not exceed 50mm; the difference between the maximum width and the minimum width of the slab does not exceed 150mm.

[0057] S2, obtaining a processing order of a first slab in the strip, wherein the plurality of slabs include the first slab;

[0058] Multiple slabs of the same specification planned for continuous rolling are cut from a coil of strip. Before rolling, the processing order of the first slab to be rolled is obtained. The processing order of the first slab to be rolled is 1, and the processing order of the subsequent slabs to be rolled increases successively. The processing order increases by 1 each time a slab is rolled.

[0059] S3, calculating a target convexity value corresponding to the first slab according to the processing sequence and rolling process parameters;

[0060] The target convexity value of the first slab to be rolled is calculated by the rolling process parameters and the preset convexity value of the first slab, that is, the target convexity value of each slab is different, and the target convexity value of each slab needs to be calculated once. It should be understood that the slabs continuously rolled under the same plan have the same rolling process parameters such as the preset convexity value, the upper convexity value, the lower convexity value and the first preset constant. Therefore, the target convexity value of the first slab is only affected by the processing order of the first slab. It should be understood that the calculated target convexity value fluctuates around the preset convexity value and should not deviate too much from the preset convexity value.

[0061] S4, controlling the first roller and the second roller which are relatively arranged to move relative to each other along the third direction according to the target crown value, and rolling the first slab at the target crown value.

[0062] After the target convexity value corresponding to the first slab is calculated, the relative displacement of the first roller and the second roller along the third direction can be calculated according to the target convexity value and the shape parameters of the first roller and the second roller, and the first roller and the second roller are controlled to move and roll the first slab according to the relative displacement, and the third direction is the axial direction of the first roller and the second roller. The shape parameters of the first roller and the second roller of the CVC rolling mill may specifically include the axial length, radius or roller surface curve change function of the first roller and the second roller. Optionally, the relative displacement of the first roller and the second roller is controlled by the stroke of the oil cylinder of the hydraulic control system. According to the magnitude and direction of the calculated relative displacement of the first roller and the second roller, the telescopic direction and telescopic stroke of the oil cylinder are controlled to push the first roller or the second roller to produce relative displacement. Since the target convexity value calculated in S3 fluctuates near the preset convexity value, the relative displacement of the first roller and the second roller fluctuates within a certain range, that is, the position of the roller shifting is dispersed to a certain extent, avoiding the serious local uneven wear of the first roller and the second roller due to the excessive concentration of the position of the roller shifting.

[0063] The control method of the CVC rolling mill of the embodiment of the present application calculates the target convexity value of the first slab according to the process parameters and the processing order of the first slab, and controls the relative movement of the first roller and the second roller along the third direction according to the target convexity value to control the straightness and convexity of the rolled slab. By calculating the target convexity value for slabs with different processing orders, the first roller and the second roller that are relatively arranged can be controlled to roll the first slab with the calculated target convexity value, so that the first roller and the second roller can shift the rollers back and forth to achieve the purpose of dispersing the shifting roller positions, avoiding the serious local uneven wear of the first roller and the second roller due to the excessive concentration of the shifting roller positions, and extending the rolling mileage of the first roller and the second roller. Reduce or avoid the local high point defects of the plate and the poor plate shape problems caused by rolling the slab.

[0064] Please refer to Figure 2 In some embodiments, the rolling process parameters include at least a preset convexity value, a convexity upper limit value, a convexity lower limit value and a first preset constant, and S3 specifically includes the following steps:

[0065] S31, calculating a first parameter according to the convexity upper limit value, the convexity lower limit value and a first preset constant;

[0066] For the slab continuously rolled under the same plan, the convexity upper limit value, the convexity lower limit value and the first preset constant are all fixed values. Therefore, for the slab continuously rolled, the calculated first parameter is also constant.

[0067] In one embodiment, S31 includes:

[0068] Calculate the difference between the upper convexity value and the lower convexity value;

[0069] The quotient of the difference and the first preset constant is calculated, and the quotient is the first parameter.

[0070] That is, the first parameter n is calculated as follows:

[0071] n=(limit up -limit dowm ) / limit cnt

[0072] Among them, limit up is the upper limit of convexity, limit dowm is the lower limit of convexity, limit cnt is the first preset constant.

[0073] For example, the following calculation will be performed using a slab identified as SPHC-B, the thickness of which is between 2.2 and 3.5 mm, and the width is between 1230 and 1330 mm. The upper limit of the convexity is +20 μm, the lower limit of the convexity is -10 μm, and the first preset constant is 60. The preset convexity value of the plan is 30 μm. Then the first parameter n is:

[0074] n=(lim it up -lim it dowm ) / lim it cnt =(0.02-(-0.01)) / 60=0.0005

[0075] After S31, it also includes:

[0076] S32, calculating a first adjustment value according to the first parameter and the processing order;

[0077] Optionally, the first adjustment value is the product of the first parameter and the processing order. It can be understood that when the first parameter remains unchanged, the first adjustment value may increase as the processing order increases.

[0078] Exemplarily, when the first parameter is 0.0005 and the processing order is 1, the first adjustment value is 0.0005×1=0.0005 mm;

[0079] When the first parameter is 0.0005 and the processing order is 2, the first adjustment value is 0.0005×2=0.001 mm;

[0080] When the first parameter is 0.0005 and the processing order is 3, the first adjustment value is 0.0005×3=0.0015 mm;

[0081] When the first parameter is 0.0005 and the processing order is 10, the first adjustment value is 0.0005×10=0.005 mm;

[0082] When the first parameter is 0.0005 and the processing order is 20, the first adjustment value is 0.0005×20=0.01 mm, and so on.

[0083] S33, calculating a second adjustment value according to the processing order and a second preset constant;

[0084] In some embodiments, S33 includes:

[0085] The second adjustment value is the remainder obtained by dividing the processing order by the second preset constant. The processing order increases successively, and the second preset constant is a fixed value. Therefore, the remainder obtained by dividing the processing order by the second preset constant is a periodically changing value. Optionally, the second preset constant is 3 or 5. When the second preset constant is 3, the remainder obtained by dividing the processing order by the second preset constant is a series with 1, 2, and 0 as a period; when the second preset constant is 5, the remainder obtained by dividing the processing order by the second preset constant is a series with 1, 2, 3, 4, and 0 as a period. The second adjustment value calculated based on the processing order and the remainder of the second preset constant is also a series that changes periodically with the processing order. Optionally, the second adjustment value is calculated according to the following formula:

[0086] ΔC=(-1+r1)*m, or ΔC=(-2+r2)*m

[0087] Wherein, ΔC is the second adjustment value, r1 is the remainder of the processing order divided by 3, r2 is the remainder of the processing order divided by 5, and m is a constant, 0.001≤m≤0.005.

[0088] Obviously, when the second preset constant is 3, the calculated second adjustment value ΔC is a series that changes with a period of 0, m, -m. When the second preset constant is 5, the calculated second adjustment value ΔC is a series that changes with a period of -m, 0, m, 2m, -2m.

[0089] It should be understood by those skilled in the art that there are many ways to achieve periodic changes in the second adjustment value, not limited to being achieved through the processing order and the remainder of the second preset constant. Optionally, the second adjustment value can also be obtained from a preset configuration table, in which the second adjustment value and the processing order have a certain mapping relationship, and each processing order corresponds to a certain second adjustment value. The data in the configuration table can be formulated by process personnel according to actual production conditions, equipment conditions, etc., and pre-stored in the control system.

[0090] It should be understood by those skilled in the art that the second adjustment value may not be a periodically changing value, and setting the periodic change is to facilitate the second adjustment value to fluctuate within a certain range. According to the actual production situation, the second adjustment value may also be a value that changes randomly within a certain interval and may not have periodicity. Optionally, the interval is centered on zero. Optionally, the second adjustment value may also be obtained from a pre-configured configuration table, which is formulated by the process personnel and stored in the control system, and the configuration table records the second adjustment value corresponding to each processing sequence.

[0091] For example, the constant m is set to 0.005,

[0092] When the processing order is 1, the second adjustment value ΔC=(-1+r1)*m=(-1+1)*0.005=0;

[0093] When the processing order is 2, the second adjustment value ΔC=(-1+r1)*m=(-1+2)*0.005=0.005;

[0094] When the processing order is 3, the second adjustment value ΔC = (-1 + r1) * m = (-1 + 0) * 0.005 = -0.005;

[0095] When the processing order is 10, the second adjustment value ΔC=(-1+r1)*m=(-1+1)*0.005=0;

[0096] When the processing order is 20, the second adjustment value ΔC=(-1+r1)*m=(-1+2)*0.005=0.005;

[0097] When the processing order is 80, the second adjustment value ΔC=(-1+r1)*m=(-1+2)*0.005=0.005.

[0098] After S33, it also includes:

[0099] S34, calculating a target convexity value according to a preset convexity value, a first adjustment value, a convexity upper limit value, a convexity lower limit value and a second adjustment value.

[0100] Since the first adjustment value increases with the increase of the processing order, when the processing order is large enough, the calculated first adjustment value is also large enough, and an excessively large first adjustment value has a relatively large impact on the target convexity value. If the calculated target convexity value is too large, the rolled slab will be unqualified due to excessive convexity. Therefore, when the processing order is large enough, it is necessary to eliminate or reduce the impact of the first adjustment value on the target convexity value so that the target convexity value is still maintained within a certain range.

[0101] Therefore, in some embodiments, S34 specifically includes:

[0102] When the processing order is less than or equal to the first preset constant, the target convexity value is equal to the sum of the preset convexity value, the first adjustment value, the convexity lower limit value and the second adjustment value;

[0103] When the processing order is greater than the first preset constant, the target convexity value is equal to the sum of the preset convexity value, the convexity upper limit value and the second adjustment value.

[0104] Under the same standard plan, the preset convexity value, the convexity upper limit value and the convexity lower limit value are all fixed values. That is to say, when the processing order is small, the target convexity value is affected by the changes of the first adjustment value and the second adjustment value at the same time; when the processing order is too large, the calculation formula of the target convexity value no longer involves the first adjustment value, and is only affected by the changes of the second adjustment value, completely eliminating the influence of the first adjustment value.

[0105] It should be understood by those skilled in the art that, when the processing order is large enough, other methods can be used to eliminate or reduce the influence of the first adjustment value on the target convexity value. Exemplarily, after the first adjustment value is calculated, different weights can be set for the first adjustment values ​​corresponding to the processing orders in different intervals. The larger the processing order, the smaller the corresponding weight, so as to reduce the influence of the larger first adjustment value on the target convexity value. The weights corresponding to the processing orders in different intervals can be obtained from a pre-set configuration table, which is stored in the control system, and the corresponding weights can be directly obtained.

[0106] Exemplarily, the preset convexity value is 0.03, the convexity upper limit value is 0.02, the convexity lower limit value is -0.01, and the first adjustment value and the second adjustment value calculated above are continuously calculated to obtain the target convexity value:

[0107] When the processing order is 1, the target convexity value is 0.03+0.0005-0.01+0=0.0205mm;

[0108] When the processing order is 2, the target convexity value is 0.03+0.001-0.01+0.005=0.0206mm;

[0109] When the processing order is 3, the target convexity value is 0.03+0.0015-0.01-0.005=0.0135mm;

[0110] When the processing order is 10, the target convexity value is 0.03+0.005-0.01+0=0.025mm;

[0111] When the processing order is 20, the target convexity value is 0.03+0.01-0.01+0.005=0.035mm;

[0112] When the processing order is 80, the target convexity value is 0.03+0.02+0.005=0.055 mm.

[0113] Please refer to Figure 3 In some embodiments, the rolling process parameters further include a preset bending roll intervention value; after S4, the control method further includes:

[0114] S5. Calculate the target bending roll intervention value according to the preset bending roll intervention value and the processing sequence;

[0115] S6. Control the bending roll force applied to the first roll and the second roll according to the target bending roll intervention value.

[0116] In some embodiments, the target bending roll intervention value varies periodically with the processing order. Optionally, the target bending roll intervention value is calculated according to the following formula:

[0117] force bendadd =force oper -(-1+r1)*p,

[0118] or force bendadd =force oper -(-2+r2)*p

[0119] Among them, force bendadd is the target bending roll intervention value, force oper is the preset bending roll intervention value, 0≤force oper ≤200kN, r1 is the remainder of the processing order divided by 3, r2 is the remainder of the processing order divided by 5, p is a constant, 50≤p≤200.

[0120] The bending roll force applied to the first roll and the second roll is controlled according to the target bending roll intervention value, so that the first roll and the second roll have additional deflection, further increasing the amplitude of roll shifting, thereby avoiding serious local uneven wear of the first roll and the second roll due to the overly concentrated position of roll shifting.

[0121] It should be understood by those skilled in the art that there are many ways to achieve periodic changes in the target bending roll intervention value, not limited to the remainder of the processing order and the second preset constant. Optionally, the third adjustment value can also be obtained through a preset configuration table, and the target bending roll intervention value is calculated based on the preset bending roll intervention value and the third adjustment value. The third adjustment value and the processing order in the configuration table have a certain mapping relationship, and each processing order corresponds to a certain third adjustment value. Optionally, the third adjustment value is a periodically changing value. Optionally, the target bending roll intervention value is equal to the sum of the preset bending roll intervention value and the third adjustment value.

[0122] It should be understood by those skilled in the art that the third adjustment value may not be a periodically changing value, but a value that varies within a certain interval, and optionally, the interval is centered on zero. The target bending roll intervention value may not be a periodically changing value, and according to actual production conditions, the target bending roll intervention value may also be a value that varies within a certain interval, and optionally, the interval in which the target bending roll intervention value is located is centered on the preset bending roll intervention value.

[0123] The bending roll force applied to the first roll and the second roll is controlled according to the target bending roll intervention value, so that the first roll and the second roll have additional deflection, and the original roll convexity of the first roll and the second roll is compensated to ensure the plate shape of the strip. The bending roll force can be provided by a hydraulic system. Optionally, the bending roll force is controlled by the stroke of the oil cylinder of the hydraulic control system, and the extension direction and extension stroke of the oil cylinder are controlled according to the size of the target bending roll intervention value. It should be understood by those skilled in the art that the greater the extension stroke of the oil cylinder, the greater the bending roll force applied to the first roll and the second roll.

[0124] For example, the preset bending roll intervention value force oper =200kN, p=100, the target bending roll intervention value is calculated as:

[0125] When the processing order is 1, force bendadd =force oper -(-1+r1)*p=100-(-1+1)*100=100kN;

[0126] When the processing order is 2, force bendadd =force oper -(-1+r1)*p=100-(-1+2)*100=0;

[0127] When the processing order is 3, force bendadd =force oper -(-1+r1)*p=100-(-1+0)*100=200kN;

[0128] When the processing order is 10, force bendadd =force oper -(-1+r1)*p=100-(-1+1)*100=100kN;

[0129] When the processing order is 20, force bendadd =force oper -(-1+r1)*p=100-(-1+2)*100=0;

[0130] When the processing order is 80, forcebendadd =force oper -(-1+r1)*p=100-(-1+2)*100=0.

[0131] Second, as Figure 4 As shown, the embodiment of the present application also provides a CVC rolling mill 10, including a processor 1, a memory 2, and a program or instruction stored in the memory 2 and executable on the processor 1. When the program or instruction is executed by the processor 1, each process of the control method embodiment of the above-mentioned CVC rolling mill is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0132] Specifically, the processor 1 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0133] The memory 2 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 2 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 2 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 2 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 2 is a non-volatile solid-state memory.

[0134] In a particular embodiment, the memory 2 comprises a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0135] The memory 2 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Thus, typically, the memory 2 includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

[0136] In a third aspect, the present application also provides a readable storage medium having a program or instruction stored thereon; when the program or instruction is executed by a processor, any one of the control methods in the first aspect of the present application is implemented.

[0137] In order to further illustrate the beneficial effects of the control method of the CVC rolling mill provided in the present application, the following examples are provided.

[0138] Please refer to Figure 5 , Figure 5 The following is a line chart showing the changes in the target convexity values ​​of multiple slabs of the same strip. In the figure, the horizontal axis is the processing order of each slab, and the vertical axis is the target convexity value corresponding to each slab. Figure 5 It can be seen that the target convexity value shows an overall upward trend with the increase of the processing order, and fluctuates back and forth within a certain range.

[0139] Please refer to Figure 6 and Figure 7 , Figure 6 The following is a curve of roll shifting value for six different grades of the same standard plan rolled according to the preset crown value. Figure 7 The graph of roll shifting values ​​for six different grades of the same standard plan rolled according to the CVC rolling mill control method provided in this application. Figure 6 and Figure 7 The horizontal axis is the processing order of each slab, and the vertical axis is the roller shifting value corresponding to each slab. F1 to F6 are slabs of the same standard plan corresponding to different grades. Figure 6 and Figure 7 It can be seen that after adjusting the target convexity value according to the control method of the CVC rolling mill provided in the first aspect of the present application, the roll shifting value fluctuates back and forth as the processing order increases, which is beneficial to improving the local wear of the first roll and the second roll and increasing the service life of the first roll and the second roll.

[0140] Please refer to Figure 8 and Fig. 9 , Figure 8 This is the cross-sectional thickness curve of the 80th slab rolled according to the preset convexity value in a certain plan. Fig. 9 This is a cross-sectional thickness curve diagram of the 80th slab rolled in a certain plan according to the control method of the CVC rolling mill provided in this application. Figure 8 and Fig. 9 In the figure, the horizontal axis is the width of the slab and the vertical axis is the thickness of the slab. Figure 8 and Fig. 9 It can be seen that after adjusting the target convexity value according to the control method provided in this application, at the end of the plan, the local high points of the slab cross section are significantly improved, which is beneficial to control the rib defects in the downstream process and improve the rolling mileage and product quality.

[0141] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0142] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0143] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0144] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0145] According to the embodiments of the present application as above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments only. Obviously, according to the above description, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modified use based on the present application. It should be understood that the protection scope of the present application is not limited to this, and any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A control method for a CVC rolling mill, characterized in that: The control method is applied to a CVC rolling mill, wherein the CVC rolling mill comprises a first roller and a second roller spaced apart in a first direction, wherein the first roller and the second roller are used to roll a slab and drive the slab to move in a second direction; the method comprises the following steps: Acquiring rolling process parameters corresponding to the strip, and cutting a roll of the strip into a plurality of slabs; Obtaining a processing order of a first slab in the strip, wherein the plurality of slabs include the first slab; Calculating a target convexity value corresponding to the first slab according to the processing sequence and the rolling process parameters; According to the target crown value, the first roller and the second roller which are arranged opposite to each other are controlled to move relatively along the third direction, so as to roll the first slab at the target crown value; The rolling process parameters at least include a preset crown value, a crown upper limit value, a crown lower limit value and a first preset constant, and the target crown value corresponding to the first slab is calculated according to the processing sequence and the rolling process parameters, including: Calculate a first parameter according to the convexity upper limit value, the convexity lower limit value and the first preset constant; Calculate a first adjustment value according to the first parameter and the processing order; A second adjustment value is calculated based on the processing order and the remainder of the second preset constant; A target convexity value is calculated based on the preset convexity value, the first adjustment value, the convexity upper limit value, the convexity lower limit value and the second adjustment value.

2. The control method according to claim 1, characterized in that: The step of calculating a target convexity value according to the preset convexity value, the first adjustment value, the convexity upper limit value, the convexity lower limit value and the second adjustment value comprises: When the processing order is less than or equal to the first preset constant, the target convexity value is the sum of the preset convexity value, the first adjustment value, the convexity lower limit value and the second adjustment value; When the processing order is greater than the first preset constant, the target convexity value is the sum of the preset convexity value, the convexity upper limit value and the second adjustment value.

3. The control method according to claim 1, characterized in that: The first parameter is calculated according to the convexity upper limit value, the convexity lower limit value and the first preset constant, including: Calculating the difference between the upper limit value of the convexity and the lower limit value of the convexity; The quotient of the difference and the first preset constant is calculated as the first parameter.

4. The control method according to claim 1, characterized in that: The calculating the first adjustment value according to the first parameter and the processing order includes: The product of the first parameter and the processing order is calculated, and the product is the first adjustment value.

5. The control method according to claim 1, characterized in that: The second adjustment value is calculated according to the following formula: ΔC=(-1+r1)*m, or ΔC=(-2+r2)*m Wherein, ΔC is the second adjustment value, r1 is the remainder of the processing order divided by 3, r2 is the remainder of the processing order divided by 5, and m is a constant, 0.001≤m≤0.

005.

6. The control method according to claim 1, characterized in that: The rolling process parameters also include a preset bending roll intervention value; after the target convexity value corresponding to the first slab is calculated according to the processing sequence and the rolling process parameters, the method further includes: Calculate a target roll bending intervention value according to the preset roll bending intervention value and the processing sequence; The bending roll force applied to the first roll and the second roll is controlled according to the target bending roll intervention value.

7. The control method according to claim 6, characterized in that: The target bending roll intervention value varies periodically with the processing sequence.

8. The control method according to claim 7, characterized in that: The target bending roll intervention value is calculated according to the following formula: force bendadd =force oper -(-1+r1)*p, or force bendadd =force oper -(-2+r2)*p Among them, force bendadd is the target bending roll intervention value, force oper is the preset bending roll intervention value, r1 is the remainder of the processing order divided by 3, r2 is the remainder of the processing order divided by 5, and p is a constant, 50≤p≤200.

9. A CVC rolling mill, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the control method according to any one of claims 1 to 8.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the control method according to any one of claims 1 to 8 are implemented.

Images