Strip steel rolling control method and device, medium and equipment

Abstract

The invention provides a strip steel rolling control method and device. The strip steel rolling control method comprises the steps that a steel grade flag bit of a target plate blank is obtained; the target plate blank is a rolled main rolled material; determining a working roll cooling strategy according to the steel grade flag bit; the working roll cooling strategy is used for determining the cooling water amount of a working roll according to the number of rolled slabs; the working roll is a newly replaced working roll; in the rolling process of the target plate blank, the cooling water amount is controlled according to a working roller cooling strategy; in this way, due to the fact that the temperature of a newly-replaced working roller is continuously increased along with increase of the number of rolled slabs in the initial rolling stage, heat on a roller body of the working roller and heat inside and outside the working roller are distributed unevenly; according to the working roller cooling strategy, the cooling water amount of the working roller is determined by referring to the number of rolled plate blanks, the cooling water amount can be adjusted in real time according to the operation condition of the working roller, roller heat balance can be improved without designing corresponding roller shapes for steel types, stable control over roller heat balance is achieved, and the working efficiency is improved. The transverse thickness difference stability and the same plate difference control precision of the strip steel are improved.

Description

Technical Field

[0001] The present application relates to the field of hot rolling technology, and in particular to a strip rolling control method, device, medium and equipment. Background Art

[0002] With the continuous expansion of hot-rolled product types and the improvement of product quality, the requirements for strip shape and size are becoming higher and higher. The larger the width-to-thickness ratio of the strip, the more difficult it is to control the shape and convexity of the strip. The cross-sectional shape of the hot-rolled finished strip will have a great impact on the downstream deep-processing products, and for highly brittle and hard products, it is not only easy to form a large transverse thickness difference, but also cause serious edge reduction, edge thinning, and even edge cracking. Problems, to a great extent, affect the product quality indicators and production efficiency.

[0003] In the prior art, roll shape optimization is generally used to control the strip thickness difference (thickness deviation on a piece of strip). However, the roll shape optimization method is not applicable to all different types of strip rolling. Therefore, the corresponding roll shape needs to be designed according to different steel grades, which increases the rolling cost to a certain extent. Summary of the invention

[0004] In response to the problems existing in the prior art, the embodiments of the present invention provide a strip rolling control method, device, medium and equipment to solve or partially solve the technical problem in the prior art that the control accuracy of the strip plate difference cannot be ensured when controlling the hot-rolled strip plate difference.

[0005] A first aspect of the present invention provides a strip rolling control method, the method comprising:

[0006] Obtaining the steel grade mark of the target slab; the target slab is the main rolled material;

[0007] The working roll cooling strategy is determined according to the steel grade mark; the working roll cooling strategy is used to determine the cooling water volume of the working roll according to the number of rolled slabs; the working roll is a newly replaced working roll;

[0008] During the rolling process of the target slab, the amount of cooling water is controlled according to the working roll cooling strategy.

[0009] In the above scheme, the working roll cooling strategy is determined according to the steel grade mark, including:

[0010] Based on the steel grade mark, the corresponding working roll cooling strategy is searched in a pre-created mapping file; the mapping file pre-stores the corresponding relationship between the steel grade mark and the working roll cooling strategy.

[0011] In the above scheme, the working roll cooling strategy is determined according to the steel grade mark, including:

[0012] If the steel grade mark is the first steel grade mark, the number of slabs rolled by the working roll and the intermittent time of the working roll are obtained;

[0013] If the number of rolled slabs is within the first threshold range, the corresponding working roll cooling strategy flag is searched according to the first threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to 30%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 30%;

[0014] If the number of rolled slabs is within the second threshold range, the corresponding working roll cooling strategy flag is searched according to the second threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to be 40%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to be 40%;

[0015] If the number of rolled slabs is within a third threshold range, the corresponding third working roll cooling strategy flag is searched according to the third threshold range, and the corresponding working roll cooling strategy is determined based on the third working roll cooling strategy flag; the working roll cooling strategy corresponding to the third working roll cooling strategy flag is: controlling the belt water volume of the working roll to 50%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 50%;

[0016] If the number of rolled slabs is within the fourth threshold range, the corresponding fourth working roll cooling strategy flag is searched according to the fourth threshold range, and the corresponding working roll cooling strategy is determined based on the fourth working roll cooling strategy flag; the working roll cooling strategy corresponding to the fourth working roll cooling strategy flag is: controlling the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 60%.

[0017] In the above scheme, the working roll cooling strategy is determined according to the steel grade mark, including:

[0018] If the steel grade mark is the second steel grade mark, the number of slabs rolled by the working roll and the intermittent time of the working roll are obtained;

[0019] If the number of rolled slabs is within the first threshold range, the corresponding working roll cooling strategy flag is searched according to the first threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to be 40%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to be 40%;

[0020] If the number of rolled slabs is within the second threshold range, the corresponding working roll cooling strategy flag is searched according to the second threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to 60%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 50%;

[0021] If the number of rolled slabs is within a third threshold range, the corresponding third working roll cooling strategy flag is searched according to the third threshold range, and the corresponding working roll cooling strategy is determined based on the third working roll cooling strategy flag; the working roll cooling strategy corresponding to the third working roll cooling strategy flag is: controlling the belt water volume of the working roll to 70%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 50%;

[0022] If the number of rolled slabs is within the fourth threshold range, the corresponding fourth working roll cooling strategy flag is searched according to the fourth threshold range, and the corresponding working roll cooling strategy is determined based on the fourth working roll cooling strategy flag; the working roll cooling strategy corresponding to the fourth working roll cooling strategy flag is: controlling the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 60%.

[0023] In the above solution, if it is determined that the number of rolled slabs is within the fifth threshold range, the method further includes:

[0024] The belt water volume of the working roll is adjusted to a normal setting value, and the intermittent water volume of the working roll is adjusted to a normal setting value; wherein, the fifth threshold range is a range corresponding to a maximum endpoint value in which the number of rolled slabs is greater than the fourth threshold range.

[0025] In the above solution, if it is determined that the intermittent duration of the working roll is greater than the first duration threshold, the method further includes:

[0026] Determine the target time range to which the intermittent duration belongs, and adjust the intermittent water volume according to the target time range.

[0027] In the above scheme, adjusting the intermittent water volume according to the target time range includes:

[0028] If it is determined that the intermittent duration is within the first duration range, adjusting the intermittent water volume from the current water volume to 80%;

[0029] If it is determined that the intermittent duration is within the second duration range, the intermittent water volume is adjusted from the current water volume to 70%;

[0030] If it is determined that the intermittent duration is within the third duration range, adjusting the intermittent water volume from the current water volume to 60%;

[0031] If it is determined that the intermittent duration is within the fourth duration range, adjusting the intermittent water volume from the current water volume to 50%;

[0032] If it is determined that the intermittent duration is within the fifth duration range, the intermittent water volume is adjusted from the current water volume to 40%.

[0033] A second aspect of the present invention provides a strip rolling control device, the device comprising:

[0034] An acquisition unit is used to acquire the steel grade mark of a target slab; the target slab is the main rolled material;

[0035] A determination unit, used for determining a working roll cooling strategy according to the steel grade mark; the working roll cooling strategy is used for determining the cooling water volume of the working roll; the working roll is a newly replaced working roll;

[0036] A control unit is used to control the amount of cooling water according to the working roll cooling strategy during the rolling process of the target slab.

[0037] According to a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0038] According to a fourth aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods described in the first aspect are implemented.

[0039] The present invention provides a strip steel rolling control method, device, medium and equipment, the method comprising: obtaining the steel grade mark of the target slab; the target slab is the main rolled material to be rolled; determining the working roll cooling strategy according to the steel grade mark; the working roll cooling strategy is used to determine the cooling water amount of the working roll according to the number of slabs that have been rolled; the working roll is a newly replaced working roll; during the rolling process of the target slab, the cooling water amount is controlled according to the working roll cooling strategy; in this way, since the newly replaced working roll will continue to heat up as the number of rolled slabs increases in the initial stage of rolling, it will cause uneven heat distribution on the working roll body and inside and outside; the working roll cooling strategy of the present application determines the cooling water amount of the working roll with reference to the number of slabs that have been rolled, and the cooling water amount can be adjusted in real time according to the operation status of the working roll, and the roll heat balance can be improved without designing the corresponding roll shape for the steel grade, so as to achieve stable control of the roll heat balance and improve the stability of the strip transverse thickness difference and the same plate difference control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0041] Figure 1 A schematic flow chart of a strip steel rolling control method according to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram showing the relationship between the roll temperature of a working roll and the thermal crown of the working roll according to an embodiment of the present invention is shown;

[0043] Figure 3 A schematic diagram showing the relationship between the number of rolled slabs and the roller temperature according to an embodiment of the present invention;

[0044] Figure 4 A schematic structural diagram of a strip steel rolling control device according to an embodiment of the present invention is shown;

[0045] Figure 5 A rolled pickled plate FB60 according to one embodiment of the present invention is shown;

[0046] Figure 6 A schematic diagram comparing the convexity of a plate obtained by using the method provided by the present invention and the method provided by the prior art according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0047] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0048] The present invention provides a strip steel rolling control method, such as Figure 1 As shown, the method mainly includes the following steps:

[0049] S110, obtaining the steel type mark of the target slab; the target slab is the main rolled material.

[0050] Generally speaking, there are two reasons that affect the difference between hot-rolled strip and plate. One is the initial roll shape and wear of the roll, and the other is the thermal crown of the roll (the smaller the thermal crown of the roll, the greater the crown of the strip and the greater the difference between the hot-rolled strip and plate).

[0051] refer to Figure 2 There is a linear relationship between roll temperature and thermal crown, so roll temperature has a direct impact on the thermal crown of the work roll. For example, if the thermal expansion coefficient of steel is 1.2*10 -5 / ℃, calculated based on the roller diameter of 800mm, the thermal expansion caused by a 10℃ temperature difference can reach 0.1mm, and the thermal expansion caused by a 1℃ temperature difference is about 0.01mm. Therefore, the lateral temperature control of the roller is the key factor in controlling the difference between the strip and the plate.

[0052] The inventors of this application have found that when controlling the roll temperature, if cooling water with a uniformly set high pressure and water volume is directly used, the heat difference at various locations of the work roll body will be further increased; in the early stage of roll change, the roll temperature rises slowly, the thermal crown is small, and the strip crown will be too large. For slabs of different steel grades in the same rolling schedule, especially slabs with high same plate difference accuracy requirements such as silicon steel, it is very easy to have problems such as excessive plate crown and excessive edge drop (excessive reduction in slab edge thickness), which in turn affects the same plate difference control accuracy of the slab.

[0053] The present invention has found in the actual production process that after the working roll is replaced, when the new working roll is rolled, Figure 3 In the initial stage of rolling, before rolling a certain number of slabs (generally 15 to 20 pieces, which can be determined based on the actual production line conditions), the roller temperature rises rapidly; after rolling a certain number of slabs, the roller temperature tends to balance.

[0054] Based on this, the present invention determines a method for step-cooling the working rolls according to the requirements of different steel grades for the lateral thickness difference, that is, the amount of cooling water for the working rolls is determined by referring to the number of slabs rolled in the initial rolling stage. The amount of cooling water can be adjusted in real time according to the temperature of the working rolls, thereby controlling the heat distribution difference of the working roll body to the greatest extent, thereby achieving thermal balance of the working rolls in the rolling stage, effectively controlling the convexity and edge drop of the rolled slabs, and improving the control accuracy of the slab difference.

[0055] As mentioned above, since different steel grades have different requirements for transverse thickness difference, the working roll cooling strategies set for different steel grades are also different. Therefore, it is necessary to first obtain the steel grade mark of the target slab, which is the main rolled material slab to be rolled. Among them, when rolling on the production line, there are two types of slabs: main rolled material and transition material. The present invention mainly controls the slab thickness difference of the main rolled material.

[0056] Specifically, for slabs on the same production line, different steel grade flags code1 can be set for different steel grades in advance to form a first mapping file between steel grades and steel grade flags. For example, when code1 is 1, it represents the first steel grade flag, specifically pickled plate or silicon steel; if code1 is 2, it represents the second steel grade flag, specifically, all remaining steel grades except pickled plate and silicon steel can be rolled on the production line.

[0057] When a certain type of slab needs to be rolled, the secondary system searches for the corresponding steel type flag in the first mapping file according to the slab steel type, and then transmits the steel type flag to the primary system, so that the primary system can obtain the corresponding steel type flag.

[0058] S111, determining a working roll cooling strategy according to the steel grade mark; the working roll cooling strategy is used to determine the cooling water volume of the working roll according to the number of rolled slabs; the working roll is a newly replaced working roll.

[0059] After obtaining the steel grade mark, the working roll cooling strategy can be determined according to the steel grade mark, including:

[0060] Based on the steel grade mark, the corresponding working roll cooling strategy is searched in the pre-created mapping file; the mapping file pre-stores the corresponding relationship between the steel grade mark and the working roll cooling strategy.

[0061] Specifically, since the amount of cooling water required by the working rolls is different when rolling different steel grades, in order to control the heat distribution difference of the working roll body to the greatest extent, thereby achieving the thermal balance of the working rolls in the rolling stage, the present invention sets different working roll cooling strategies for different steel grades. Among them, the working roll cooling strategy is used to determine the amount of cooling water for the working rolls according to the number of slabs that have been rolled; the working rolls are newly replaced working rolls.

[0062] In one embodiment, the working roll cooling strategy is determined according to the steel grade mark, including:

[0063] If the steel grade mark is the first steel grade mark, the number of slabs rolled by the working rolls and the intermittent time of the working rolls are obtained;

[0064] If the number of rolled slabs is within the first threshold range, the corresponding working roll cooling strategy flag is searched according to the first threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to 30%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to 30%;

[0065] If the number of rolled slabs is within the second threshold range, the corresponding working roll cooling strategy flag is searched according to the second threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to be 40%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to be 40%;

[0066] If the number of rolled slabs is within the third threshold range, the corresponding third working roll cooling strategy flag is searched according to the third threshold range, and the corresponding working roll cooling strategy is determined based on the third working roll cooling strategy flag; the working roll cooling strategy corresponding to the third working roll cooling strategy flag is: controlling the belt water volume of the working roll to 50%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to 50%;

[0067] If the number of rolled slabs is within the fourth threshold range, the corresponding fourth working roll cooling strategy flag is searched according to the fourth threshold range, and the corresponding working roll cooling strategy is determined based on the fourth working roll cooling strategy flag; the working roll cooling strategy corresponding to the fourth working roll cooling strategy flag is: controlling the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 60%.

[0068] In one embodiment, the working roll cooling strategy is determined according to the steel grade mark, including:

[0069] If the steel grade mark is the second steel grade mark, the number of slabs rolled by the working rolls and the intermittent time of the working rolls are obtained;

[0070] If the number of rolled slabs is within the first threshold range, the corresponding working roll cooling strategy flag is searched according to the first threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to be 40%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to be 40%;

[0071] If the number of rolled slabs is within the second threshold range, the corresponding working roll cooling strategy flag is searched according to the second threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to 60%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to 50%;

[0072] If the number of rolled slabs is within the third threshold range, the corresponding third working roll cooling strategy flag is searched according to the third threshold range, and the corresponding working roll cooling strategy is determined based on the third working roll cooling strategy flag; the working roll cooling strategy corresponding to the third working roll cooling strategy flag is: controlling the belt water volume of the working roll to 70%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to 50%;

[0073] If the number of rolled slabs is within the fourth threshold range, the corresponding fourth working roll cooling strategy flag is searched according to the fourth threshold range, and the corresponding working roll cooling strategy is determined based on the fourth working roll cooling strategy flag; the working roll cooling strategy corresponding to the fourth working roll cooling strategy flag is: controlling the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 60%.

[0074] If it is determined that the number of rolled slabs is within a fifth threshold range, the method further includes:

[0075] The belt water volume of the working roll is adjusted to a normal setting value, and the intermittent water volume of the working roll is adjusted to a normal setting value; wherein the fifth threshold range is a range corresponding to a maximum endpoint value in which the number of rolled slabs is greater than the fourth threshold range. The normal setting value of the belt water volume is 90%, and the normal setting value of the intermittent water volume is 70%.

[0076] Specifically, in the initial rolling period after the new rolls are replaced, the roll temperature rises rapidly after a certain number of slabs are rolled. In order to improve the cooling accuracy of the working rolls, the present invention refines the cooling strategy according to the number of times the working rolls have been rolled. The details are shown in Table 1:

[0077] Table 1

[0078]

[0079] As can be seen from Table 1, when the steel grade flag code1=1, the first threshold range is 1-5, the working roll cooling strategy flag code2 corresponding to the first threshold range is 1, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 30%; if the intermittent time of the working roll is less than the first time threshold, control the intermittent water volume of the working roll to 30%. Among them, the first time threshold can be determined according to the actual situation, such as 50s.

[0080] When the steel grade flag code1=1, the second threshold range is 6-10, the working roll cooling strategy flag code2 corresponding to the second threshold range is 2, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 40%; if the intermittent duration of the working roll is less than the first duration threshold, control the intermittent water volume of the working roll to 40%.

[0081] When the steel grade flag code1=1, the third threshold range is 11-15, the working roll cooling strategy flag code2 corresponding to the third threshold range is 3, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 50%; if the intermittent duration of the working roll is less than the first duration threshold, control the intermittent water volume of the working roll to 50%.

[0082] When the steel grade flag code1=1, the fourth threshold range is 16-20, the working roll cooling strategy flag code2 corresponding to the fourth threshold range is 4, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, control the intermittent water volume of the working roll to 60%.

[0083] Similarly, when the steel grade flag code1=2, the first threshold range is 1-5, the first threshold range corresponds to the working roll cooling strategy flag code2=6, and the working roll cooling strategy flag corresponds to the working roll cooling strategy flag: control the belt water volume of the working roll to 40%; if the intermittent time of the working roll is less than the first time threshold, control the intermittent water volume of the working roll to 40%. Among them, the first time threshold can be determined according to the actual situation, such as 50s.

[0084] When the steel grade flag code1=1, the second threshold range is 6-10, the working roll cooling strategy flag code2 corresponding to the second threshold range is 7, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 600%; if the intermittent duration of the working roll is less than the first duration threshold, control the intermittent water volume of the working roll to 50%.

[0085] When the steel grade flag code1=1, the third threshold range is 11-15, the working roll cooling strategy flag code2 corresponding to the third threshold range is 8, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 50%; if the intermittent duration of the working roll is less than the first duration threshold, control the intermittent water volume of the working roll to 50%.

[0086] When the steel grade flag code1=1, the fourth threshold range is 16-20, the working roll cooling strategy flag code2 corresponding to the fourth threshold range is 9, and the working roll cooling strategy flag corresponding to the working roll cooling strategy flag is: control the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, control the intermittent water volume of the working roll to 60%.

[0087] It is worth noting that, regardless of whether the steel grade flag code1=1 or code1=2, the fifth threshold range is greater than 20, and the fifth threshold range corresponds to the working roll cooling strategy flag code2=5. The working roll cooling strategy flag corresponds to the working roll cooling strategy flag to adjust the belt water volume of the working roll to the normal setting value and the intermittent water volume of the working roll to the normal setting value. That is, the belt water volume of the working roll needs to be controlled to 90%; if the intermittent duration of the working roll is less than the first duration threshold, the intermittent water volume of the working roll is controlled to 70%.

[0088] Further, in one embodiment, if it is determined that the intermittent duration of the working roll is greater than the first duration threshold, the method further includes:

[0089] Determine the target time range to which the intermittent duration belongs, and adjust the intermittent water volume according to the target time range.

[0090] In one embodiment, adjusting the intermittent water volume according to the target time range includes:

[0091] If it is determined that the intermittent duration is within the first duration range, the intermittent water volume is adjusted from the current water volume to 80%;

[0092] If it is determined that the intermittent duration is within the second duration range, the intermittent water volume is adjusted from the current water volume to 70%;

[0093] If it is determined that the intermittent duration is within the third duration range, the intermittent water volume is adjusted from the current water volume to 60%;

[0094] If it is determined that the intermittent duration is within the fourth duration range, the intermittent water volume is adjusted from the current water volume to 50%;

[0095] If it is determined that the intermittent duration is within the fifth duration range, the intermittent water volume is adjusted from the current water volume to 40%.

[0096] Specifically, in the continuous production process of hot rolling, intermittent short shutdowns are inevitable, such as equipment failure, quality confirmation, etc., which will reduce the production rhythm and extend the steel production time. When the rolling rhythm is reduced, the working roll cooling water is a fixed gap water volume. Long-term cooling will reduce the roll temperature, reduce the thermal crown, and increase the crown. Therefore, the present invention needs to continue to adjust the intermittent water volume according to the intermittent duration. The adjustment logic is shown in Table 2:

[0097] Table 2

[0098] Interval duration Intermittent water volume More than 150s 40％ 120<Interval time≤150s 50％ 90<Interval time≤120s 60％ 75<Interval time≤90s 70％ 50<Interval time≤75s 80％

[0099] It can be seen from Table 2 that the first duration range is: (50s, 75s], the second duration range is: (75s, 90s], the third duration range is: (90s, 120s], the fourth duration range is: (120s, 150s], and the fifth duration range is: greater than 150s.

[0100] In addition, if the number of rolled slabs is within the fifth threshold range, but the intermittent duration of the working rolls is greater than the first duration threshold, the normal setting value of the intermittent water volume also needs to be adjusted according to the adjustment strategy in Table 2.

[0101] S112, during the rolling process of the target slab, controlling the amount of cooling water according to the working roll cooling strategy.

[0102] After the above-mentioned working roll cooling strategy is determined, during the rolling process of the target slab, the amount of cooling water can be controlled according to the working roll cooling strategy.

[0103] In this way, since the newly replaced working rolls will continue to heat up as the number of rolled slabs increases in the initial stage of rolling, it will cause uneven heat distribution on the working roll body and inside and outside the roll; the working roll cooling strategy of the present application refers to the number of rolled slabs to determine the amount of cooling water for the working rolls, and can adjust the cooling water amount in real time according to the actual temperature of the working rolls, thereby achieving stable control of the thermal balance of the rolling rolls and improving the stability of the lateral thickness difference of the strip and the control accuracy of the same-plate difference.

[0104] Based on the same inventive concept as in the above-mentioned embodiment, this embodiment also provides a strip rolling control device, such as Figure 4 As shown, the device comprises:

[0105] The acquisition unit 41 is used to acquire the steel type mark of the target slab; the target slab is the main rolled material;

[0106] A determination unit 42 is used to determine a working roll cooling strategy according to the steel grade mark; the working roll cooling strategy is used to determine the cooling water volume of the working roll; the working roll is a newly replaced working roll;

[0107] The control unit 43 is used to control the cooling water volume according to the working roll cooling strategy during the rolling process of the target slab.

[0108] Since the device introduced in the embodiment of the present invention is a device used to implement the strip rolling control method of the embodiment of the present invention, based on the method introduced in the embodiment of the present invention, the person skilled in the art can understand the specific structure and deformation of the device, so it is not repeated here. All devices used in the method of the embodiment of the present invention belong to the scope of protection of the present invention.

[0109] Based on the same inventive concept, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any step of the method described above when executing the computer program.

[0110] Based on the same inventive concept, this embodiment provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the methods described above are implemented.

[0111] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0112] The present invention provides a strip steel rolling control method, device, medium and equipment, the method comprising: obtaining the steel grade mark of the target slab; the target slab is the main rolled material to be rolled; determining the working roll cooling strategy according to the steel grade mark; the working roll cooling strategy is used to determine the cooling water amount of the working roll according to the number of slabs that have been rolled; the working roll is a newly replaced working roll; during the rolling process of the target slab, the cooling water amount is controlled according to the working roll cooling strategy; in this way, since the newly replaced working roll will continue to heat up as the number of rolled slabs increases in the initial stage of rolling, it will cause uneven heat distribution on the working roll body and inside and outside; the working roll cooling strategy of the present application determines the cooling water amount of the working roll with reference to the number of slabs that have been rolled, and the cooling water amount can be adjusted in real time according to the operation status of the working roll, and the roll heat balance can be improved without designing the corresponding roll shape for the steel grade, so as to achieve stable control of the roll heat balance and improve the stability of the strip transverse thickness difference and the same plate difference control accuracy.

[0113] In practical applications, when a certain type of steel is rolled using the strip rolling control method and device provided in the above embodiment, the following is achieved:

[0114] First, when it is determined that the control method provided by the present invention has been put into use, the H222A329 plan sheet is rolled. After the secondary system determines that the roll is changed, SDC01 is the transition plate, and the main rolling material of the rolling plan sheet is the pickling plate FB60, so the flag code1 is issued = 1. The rolling sequence table of the H222A329 plan sheet is shown in Table 3 (roll the transition plate first and then the main rolling material):

[0115] Table 3

[0116]

[0117] After the primary system receives the main rolling material steel grade flag code1=1 sent by the secondary system, it determines the working roll cooling strategy according to the steel grade flag. After replacing the working roll, the primary system accumulates the number of rolled slabs of the main rolling material after the roll change, thereby determining the belt water load and intermittent water volume of the working roll when rolling the current slab. Among them, the belt water load and intermittent water volume of the working roll are shown in Table 4:

[0118] Table 4

[0119]

[0120] At the same time, during the continuous production process of hot rolling, the first-level system calculates the production rhythm of two adjacent slabs in real time, and determines the intermittent water volume according to the interval between the two slabs (the working roll intermittent time). The control logic of the intermittent water volume can be referred to as shown in Table 2 above, so it will not be repeated here. The specific working roll cooling water volume can be referred to Figure 5 As shown, in Figure 5 In the figure, mark 51 represents the belt water capacity, and mark 52 represents the intermittent water capacity.

[0121] The final control effect of the slab convexity can be referred to Figure 6 , mark 61 is the slab convexity corresponding to the rolling method in the prior art, and mark 62 is the slab convexity obtained by using the method provided by the present invention. Figure 6 UCL in the figure is the upper limit of the slab outlet convexity, X is the average convexity value, LCL is the lower limit of the slab outlet convexity, the observed value is the number of slabs involved in rolling, and the individual value is the actual slab convexity. It can be seen that the slab convexity corresponding to mark 62 is significantly smaller than the slab convexity corresponding to mark 61, indicating that the rolling control method provided by the present invention can effectively improve the slab convexity and improve the control accuracy of the slab same-plate difference.

[0122] The present invention uses the influence of the roll temperature on the thermal crown to establish a step cooling strategy. After automatically identifying that the main rolled material in the rolling plan is silicon steel or pickled plate, the cooling water flow rate of the working roll is set according to the number of slabs in the plan. As the temperature of each part of the working roll gradually rises and reaches thermal equilibrium, the cooling water volume is gradually increased from small to large to cool the working roll, and the heat distribution difference of the working roll body is controlled to the greatest extent, so as to achieve the thermal balance of the working roll in the rolling stage, effectively improve the slab crown and edge drop of the rolled slab, and improve the control accuracy of the same slab difference of the slab.

[0123] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0124] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A strip rolling control method, characterized in that: The method comprises: Obtaining the steel grade mark of the target slab; the target slab is the main rolled material; The working roll cooling strategy is determined according to the steel grade mark; the working roll cooling strategy is used to determine the cooling water volume of the working roll according to the number of rolled slabs; the working roll is a newly replaced working roll; During the rolling process of the target slab, the amount of cooling water is controlled according to the working roll cooling strategy.

2. The method according to claim 1, characterized in that Determining the working roll cooling strategy according to the steel grade mark includes: Based on the steel grade mark, the corresponding working roll cooling strategy is searched in a pre-created mapping file; the mapping file pre-stores the corresponding relationship between the steel grade mark and the working roll cooling strategy.

3. The method according to claim 1, characterized in that Determining the working roll cooling strategy according to the steel grade mark includes: If the steel grade mark is the first steel grade mark, the number of slabs rolled by the working roll and the intermittent time of the working roll are obtained; If the number of rolled slabs is within the first threshold range, the corresponding working roll cooling strategy flag is searched according to the first threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to 30%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 30%; If the number of rolled slabs is within the second threshold range, the corresponding working roll cooling strategy flag is searched according to the second threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to be 40%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to be 40%; If the number of rolled slabs is within a third threshold range, the corresponding third working roll cooling strategy flag is searched according to the third threshold range, and the corresponding working roll cooling strategy is determined based on the third working roll cooling strategy flag; the working roll cooling strategy corresponding to the third working roll cooling strategy flag is: controlling the belt water volume of the working roll to 50%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 50%; If the number of rolled slabs is within the fourth threshold range, the corresponding fourth working roll cooling strategy flag is searched according to the fourth threshold range, and the corresponding working roll cooling strategy is determined based on the fourth working roll cooling strategy flag; the working roll cooling strategy corresponding to the fourth working roll cooling strategy flag is: controlling the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 60%.

4. The method according to claim 1, characterized in that Determining the working roll cooling strategy according to the steel grade mark includes: If the steel grade mark is the second steel grade mark, the number of slabs rolled by the working roll and the intermittent time of the working roll are obtained; If the number of rolled slabs is within the first threshold range, the corresponding working roll cooling strategy flag is searched according to the first threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to be 40%; if the intermittent time of the working roll is less than the first time threshold, controlling the intermittent water volume of the working roll to be 40%; If the number of rolled slabs is within the second threshold range, the corresponding working roll cooling strategy flag is searched according to the second threshold range, and the corresponding working roll cooling strategy is determined based on the working roll cooling strategy flag; the working roll cooling strategy corresponding to the working roll cooling strategy flag is: controlling the belt water volume of the working roll to 60%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 50%; If the number of rolled slabs is within a third threshold range, the corresponding third working roll cooling strategy flag is searched according to the third threshold range, and the corresponding working roll cooling strategy is determined based on the third working roll cooling strategy flag; the working roll cooling strategy corresponding to the third working roll cooling strategy flag is: controlling the belt water volume of the working roll to 70%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 50%; If the number of rolled slabs is within the fourth threshold range, the corresponding fourth working roll cooling strategy flag is searched according to the fourth threshold range, and the corresponding working roll cooling strategy is determined based on the fourth working roll cooling strategy flag; the working roll cooling strategy corresponding to the fourth working roll cooling strategy flag is: controlling the belt water volume of the working roll to 80%; if the intermittent duration of the working roll is less than the first duration threshold, controlling the intermittent water volume of the working roll to 60%.

5. The method according to claim 3 or 4, characterized in that If it is determined that the number of rolled slabs is within a fifth threshold range, the method further includes: The belt water volume of the working roll is adjusted to a normal setting value, and the intermittent water volume of the working roll is adjusted to a normal setting value; wherein, the fifth threshold range is a range corresponding to a maximum endpoint value in which the number of rolled slabs is greater than the fourth threshold range.

6. The method according to claim 3 or 4, characterized in that If it is determined that the intermittent duration of the working roll is greater than the first duration threshold, the method further includes: Determine the target time range to which the intermittent duration belongs, and adjust the intermittent water volume according to the target time range.

7. The method according to claim 6, characterized in that The step of adjusting the intermittent water volume according to the target time range includes: If it is determined that the intermittent duration is within the first duration range, adjusting the intermittent water volume from the current water volume to 80%; If it is determined that the intermittent duration is within the second duration range, the intermittent water volume is adjusted from the current water volume to 70%; If it is determined that the intermittent duration is within the third duration range, adjusting the intermittent water volume from the current water volume to 60%; If it is determined that the intermittent duration is within the fourth duration range, adjusting the intermittent water volume from the current water volume to 50%; If it is determined that the intermittent duration is within the fifth duration range, the intermittent water volume is adjusted from the current water volume to 40%.

8. A strip steel rolling control device, characterized in that: The device comprises: An acquisition unit is used to acquire the steel grade mark of a target slab; the target slab is the main rolled material; A determination unit, used for determining a working roll cooling strategy according to the steel grade mark; the working roll cooling strategy is used for determining the cooling water volume of the working roll; the working roll is a newly replaced working roll; A control unit is used to control the amount of cooling water according to the working roll cooling strategy during the rolling process of the target slab.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

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