A production method for ultra-fast cooling zone of thin steel strip

Abstract

The present application relates to the field of metal rolling technology, and more particularly to a method for producing an ultra-fast cooling zone for thin steel strips, wherein the ultra-fast cooling zone includes multiple groups of cold headers. The method comprises determining a temperature control zone for the strip and a cooling mode corresponding to the temperature control zone based on the thickness of the strip; cooling the temperature control zone based on the cooling mode; and performing temperature compensation on the temperature control zone based on the temperature of the temperature control zone after cooling to obtain a target strip. This method analyzes the areas of the strip that may deform due to cooling after passing through ultra-fast cooling equipment for strips of different thicknesses. By controlling the cooling mode of the temperature control zone, deformation of the thin strip in the ultra-fast cooling zone is prevented, thereby improving product yield and production safety.

Description

Technical Field

[0001] This application relates to the technical field of metal rolling, and particularly to a production method for the ultra-fast cooling area of thin steel strip. Background Art

[0002] The ultra-fast cooling technology is one of the most advanced technologies for controlling the cooling rate of strip steel. Due to the fast rolling speed and thin thickness of thin steel strip, problems such as warping and front-end folding often occur at the exit of the finishing mill. When the thin steel strip enters the ultra-fast cooling area after passing through the exit of the finishing mill, the deformation of the strip is more obvious, and there is a risk of collision between the deformed part and the ultra-fast cooling equipment, which not only affects the product成材率 (成材率 should be translated as "yield rate" in this context), but also poses potential production safety hazards, significantly limiting the thickness range of strip steel that can use the ultra-fast cooling technology. The existing technologies mainly solve problems such as warping and buckling of strip steel in the finishing mill area, but lack methods to prevent the deformation of thin steel strip in the ultra-fast cooling area. Summary of the Invention

[0003] In order to prevent the deformation of thin strip steel in the ultra-fast cooling area, thereby improving the product yield rate and production safety performance,

[0004] In a first aspect, this application provides a production method for the ultra-fast cooling area of thin steel strip. The ultra-fast cooling area includes multiple groups of cooling headers, and the method includes

[0005] Based on the thickness of the strip steel, determine the temperature control area of the strip steel and the corresponding cooling mode;

[0006] Cool the temperature control area based on the cooling mode;

[0007] Based on the temperature of the temperature control area after cooling, perform temperature compensation on the temperature control area to obtain the target strip steel.

[0008] Further, the determining the temperature control area of the strip steel based on the thickness of the strip steel includes,

[0009] Compare the thickness of the strip steel with a set critical value, and determine the temperature control area according to the comparison result.

[0010] Further, the comparing the thickness of the strip steel with a set critical value and determining the temperature control area according to the comparison result includes,

[0011] Compare the thickness D0 of the strip steel with the set first critical value D1 = 3mm and the set second critical value D2 = 5mm,

[0012] When D1 < D0 ≤ D2 is satisfied, determine the range of the front length L ≤ 5m of the strip steel as the first temperature control area; when D0 ≤ D1 is satisfied, determine the range of the front length L ≤ 10m of the strip steel as the second temperature control area.

[0013] Furthermore, the determining of the cooling mode corresponding to the temperature control area based on the thickness of the steel strip includes determining a target cold header to be pre-opened based on the thickness of the steel strip;

[0014] When the end of the temperature control area passes the target cold header, the corresponding target cold header is opened.

[0015] Furthermore, determining the cooling mode corresponding to the temperature control area includes calculating and obtaining the cooling mode corresponding to the temperature control area through a post-rolling cooling feedforward model.

[0016] Furthermore, the temperature compensation of the temperature-controlled area based on the temperature of the temperature-controlled area after cooling includes:

[0017] Obtaining the temperature of the temperature-controlled area;

[0018] Based on the temperature of the temperature control area, temperature compensation is performed on the temperature control area through the post-rolling cooling feedforward model.

[0019] Furthermore, the method further comprises, after obtaining the target steel strip,

[0020] Setting a sample area based on the steel grade of the steel strip;

[0021] An ultrafast cooling self-learning model of the sample area is obtained based on the thickness of the steel strip and the temperature compensation data.

[0022] In the second aspect, the present application provides a production device for ultra-fast cooling of thin steel strips, comprising:

[0023] a calculation module, configured to determine a temperature control region of the steel strip and a cooling mode corresponding to the temperature control region based on the thickness of the steel strip;

[0024] a cooling module, configured to cool the temperature-controlled area based on the cooling mode;

[0025] The compensation module is used to perform temperature compensation on the temperature-controlled area based on the temperature of the temperature-controlled area after cooling to obtain a target steel strip.

[0026] In a third aspect, the present application provides an electronic device 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 method steps described in any one of the first aspects are implemented.

[0027] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the method steps described in the first aspect.

[0028] Beneficial effects:

[0029] The method provided in this application first determines the temperature-controlled area of the steel strip and the corresponding cooling mode based on the thickness of the steel strip; then cools the temperature-controlled area based on the cooling mode; and finally, based on the temperature of the temperature-controlled area after cooling, performs temperature compensation on the temperature-controlled area to obtain the target steel strip. This method analyzes the areas of steel strips of varying thickness that may deform due to cooling after passing through ultra-rapid cooling equipment. By controlling the cooling mode of the temperature-controlled areas, deformation of thin steel strips in the ultra-rapid cooling areas is prevented, thereby improving product yield and production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a schematic diagram of the method flow provided in Example 1 of the present application;

[0032] Figure 2 This is the equipment layout diagram of the post-rolling area provided in Example 1 of the present application;

[0033] Figure 3 This is a schematic diagram of the weak cooling mode provided in Example 1 of the present application;

[0034] Figure 4 This is a schematic diagram of the non-cooling mode provided in Example 2 of the present application;

[0035] Figure 5 This is a schematic diagram of the electronic device structure provided in Example 4 of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0037] Example 1

[0038] Combined with attachment Figure 1 The present application provides a method for producing an ultra-fast cooling zone of a thin steel strip, comprising the following steps:

[0039] S1, determining a temperature control area of the steel strip and a cooling mode corresponding to the temperature control area based on the thickness of the steel strip;

[0040] S2, cooling the temperature-controlled area based on the cooling mode;

[0041] S3. Based on the temperature after cooling of the temperature control zone, perform temperature compensation on the temperature control zone to obtain a target strip steel;

[0042] S4. Set a sample area based on the steel grade of the strip steel; based on the thickness of the strip steel and the data of the temperature compensation, obtain an ultra-fast cooling self-learning model for the sample area.

[0043] Specifically, when performing step S1, based on the thickness of the strip steel, determine the temperature control zone of the strip steel and the corresponding cooling mode for the temperature control zone,

[0044] Determining the temperature control zone of the strip steel based on the thickness of the strip steel includes,

[0045] Compare the thickness D0 of the strip steel with the set first critical value D1 = 3 mm and the set second critical value D2 = 5 mm,

[0046] When D1 < D0 ≤ D2 is satisfied, determine the range of the front section length L ≤ 5 m of the strip steel as the first temperature control zone;

[0047] When D0 ≤ D1 is satisfied, determine the range of the front section length L ≤ 10 m of the strip steel as the second temperature control zone;

[0048] Determining the corresponding cooling mode for the temperature control zone includes using a post-rolling cooling feedforward model to determine the corresponding cooling mode for the temperature control zone;

[0049] Determining the corresponding cooling mode for the temperature control zone further includes,

[0050] Based on the steel grade of the strip steel, determine the target cooling headers to be pre-opened;

[0051] When the end of the temperature control zone passes through the target cooling headers, open the corresponding target cooling headers;

[0052] Perform step S2. Cool the temperature control zone based on the cooling mode;

[0053] Perform step S3. Based on the temperature after cooling of the temperature control zone, perform temperature compensation on the temperature control zone to obtain a target strip steel;

[0054] Including obtaining the temperature of the temperature control zone through the post-rolling cooling feedforward model;

[0055] Based on the temperature of the temperature control zone, perform temperature compensation on the temperature control zone in the laminar flow region;

[0056] Specifically, in Embodiment 1, in combination with the attached Figure 2, three sets of ultra-fast cooling equipment are arranged adjacent to the finish rolling outlet. Each set of ultra-fast cooling equipment has 4 pairs of cooling headers. Each pair of cooling headers consists of two opposite upper and lower cooling headers. For clear description, the three sets of target cooling headers are numbered. The cooling header closest to the finish rolling outlet is defined as the first set. The first pair of cooling headers in the first set closest to the finish rolling outlet are numbered as cooling header 1-1 upper and cooling header 1-1 lower respectively. The remaining cooling headers are numbered in sequence according to the above numbering rules as cooling header 1-2 upper, cooling header 1-2 lower... cooling header 3-4 lower; there are 16 sets of laminar cooling equipment at the outlet of the ultra-fast cooling equipment, and a coiler is provided at the outlet of the laminar equipment. The hot-rolled strip passes through the finish rolling outlet, ultra-fast cooling equipment, laminar cooling equipment in sequence, and then enters the coiler. A temperature measurement area is set at the coiler to read the strip temperature;

[0057] The plain carbon steel with a strip thickness of 4.5 mm is used in Example 1;

[0058] The strip thickness D0 = 4.5 mm and the type of plain carbon steel are input into the post-rolling cooling feed-forward model.

[0059] The post-rolling cooling feed-forward model compares the strip thickness D0 = 4.5 mm with the set first critical value D1 = 3 mm and the set second critical value D2 = 5 mm. Since 3 mm < D0 < 5 mm, within the range of the front end length of 5 m of the strip, the front end of the strip is prone to curling due to cold deformation after entering the ultra-fast cooling area. Therefore, the range where the front end of the strip L ≤ 5 m is set as the first temperature control area;

[0060] The cooling mode of the first temperature control area calculated by the post-rolling cooling feed-forward model is the weak cooling mode: 。

[0061] The cooling headers numbered 1-1 lower, 1-4 lower, 2-1 lower, 2-4 lower and 3-1 lower are used as target cooling headers and are opened after passing through the corresponding target cooling headers at the end of the first temperature control area; the cooling headers other than those numbered 1-1 lower, 1-4 lower, 2-1 lower, 2-4 lower and 3-1 lower are always in the open state;

[0062] Specifically, when the end of the first temperature control area passes through cooling header 1-1 lower, cooling header 1-1 lower is opened. When the end of the first temperature control area passes through cooling header 1-4 lower, cooling header 1-4 lower is opened... When the end of the first temperature control area passes through cooling header 3-4 lower, cooling header 3-4 lower is opened.

[0063] During the process of the first temperature control area passing through the cooling headers, the post-rolling cooling feed-forward model calculates the temperature of the first temperature control area once every 100 ms according to the opening state of the cooling headers, compares the temperature of the first temperature control area with the standard temperature value, and performs temperature compensation on the first temperature control area according to the measured temperature value of the first temperature control area after all the cooling headers of the ultra-fast cooling equipment are opened.

[0064] Execute step S4 to set a sample area based on the steel type of the steel strip, and obtain an ultra-fast cooling self-learning model of the sample area based on the thickness of the steel strip and the temperature compensation data.

[0065] Based on the type of the strip, which is ordinary carbon steel, the 15m length range of the front end of the strip is taken as the learning sample area. Based on the data of the strip thickness and the temperature compensation, a self-learning model of the production method of the ultra-fast cooling area of the strip is established to improve the control accuracy of the ultra-fast cooling production method.

[0066] Example 1 determines the temperature control area of the strip based on the thickness of the strip, then determines the cooling mode corresponding to the temperature control area, and cools the temperature control area based on the cooling mode; finally, based on the temperature of the temperature control area after cooling, the temperature control area is temperature compensated to obtain the target strip; this method analyzes the areas of the strip that may be deformed due to cooling after passing through the ultra-fast cooling equipment for strips of different thicknesses, and prevents thin strips from deforming in the ultra-fast cooling area by controlling the cooling mode of the temperature control area, thereby improving the product yield and production safety performance.

[0067] Example 2

[0068] Based on the same inventive concept, three groups of ultra-fast cooling equipment are set up adjacent to the finishing rolling exit. Each group of ultra-fast cooling equipment has four pairs of cold headers, and each pair of cold headers consists of two upper and lower opposing cold headers. For clarity of description, the three groups of target cold headers are numbered, and the cold headers closest to the finishing rolling exit are defined as the first group. The first pair of cold headers in the first group closest to the finishing rolling exit are numbered as cold headers 1-1, and the remaining cold headers are numbered sequentially as cold headers 1-2...cold headers 3-4 according to the above numbering rules.

[0069] There are 16 sets of laminar cooling equipment at the outlet of the ultra-fast cooling equipment, and a coiler at the outlet of the laminar cooling equipment. The hot-rolled strip passes through the finishing outlet, ultra-fast cooling equipment, laminar cooling equipment, and then enters the coiler. A temperature measuring area is set at the coiler to read the strip temperature.

[0070] Example 2 uses high-strength steel with a thickness of 2.5 mm;

[0071] The strip thickness D0 = 2.5 mm, model is high strength steel, input into the post-rolling cooling feedforward model,

[0072] The post-rolling cooling feedforward model compares the strip thickness D0 = 2.5 mm with the set first critical value D1 = 3 mm and the set second critical value D2 = 5 mm. Since D0 < 5 mm, the front end of the strip within a length of 10 m is prone to curling due to cold deformation after entering the ultra-fast cooling zone. Therefore, the front end of the strip within a length of L ≤ 10 m is set as the second temperature control zone.

[0073] The cooling mode of the second temperature control area calculated by the post-rolling cooling feedforward model is the non-cooling mode.

[0074] All the cold headers included in the ultra-fast cooling equipment are used as target cold headers, and are opened after passing through the corresponding target cold header at the end of the second temperature control zone;

[0075] Specifically, when the end of the second temperature control area passes under the cold header 1-1, the cold header 1-1 is opened, when the end of the second temperature control area passes under the cold header 1-2, the cold header 1-2 is opened... When the end of the second temperature control area passes under the cold header 3-4, the cold header 3-4 is opened.

[0076] When the second temperature-controlled area passes through the cold header, the post-rolling cooling feedforward model calculates the temperature of the second temperature-controlled area every 100ms according to the opening status of the cold header, and compares the temperature of the second temperature-controlled area with the standard temperature value. When all the cold headers in the ultra-fast cooling area are opened, temperature compensation is performed on the second temperature-controlled area.

[0077] Based on the type of the strip, which is ordinary carbon steel, the 10m length range of the front end of the strip is taken as the learning sample area. Based on the data of the strip thickness and the temperature compensation, a self-learning model of the production method of the ultra-fast cooling area of the strip is established to improve the control accuracy of the ultra-fast cooling production method.

[0078] Example 3

[0079] Based on the same inventive concept, Example 3 provides a production device for ultra-fast cooling of thin steel strips, comprising:

[0080] a calculation module, configured to determine a temperature control region of the steel strip and a cooling mode corresponding to the temperature control region based on the thickness of the steel strip;

[0081] a cooling module, configured to cool the temperature-controlled area based on the cooling mode;

[0082] The compensation module is used to perform temperature compensation on the temperature-controlled area based on the temperature of the temperature-controlled area after cooling to obtain a target steel strip.

[0083] Example 4

[0084] Based on the same inventive concept, embodiment 4 of the present application provides an electronic device, as shown in the attached Figure 5 As shown, it includes a memory 304, a processor 302 and a computer program stored in the memory 304 and capable of running on the processor 302. When the processor 302 executes the program, the steps of the above-mentioned production method of the ultra-fast cooling zone of thin steel strip are implemented.

[0085] Among them, Figure 5In the embodiment of the present invention, a bus architecture (represented by bus 300) is shown. Bus 300 may include any number of interconnected buses and bridges, and bus 300 links together various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 306 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 may be used to store data used by processor 302 when performing operations.

[0086] Example 5

[0087] Based on the same inventive concept, embodiment 5 of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned production method of the ultra-fast cooling zone of a thin steel strip.

[0088] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general-purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing this type of system. In addition, the present invention is not directed to any specific programming language. It should be understood that various programming languages can be utilized to realize the content of the present invention described herein, and the above description of specific languages is for the purpose of disclosing the best mode of the present invention.

[0089] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0090] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Accordingly, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the invention.

[0091] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition may be divided into multiple submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed herein may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0092] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination.

[0093] The various component embodiments of the present invention can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all of the functions of some or all of the components of the thermal simulation device for an aluminum substrate or an electronic device according to an embodiment of the present invention. The present invention can also be implemented as a device or device program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention can be stored on a computer-readable medium, or can be in the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0094] The above is only an embodiment of the present application. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of this application, several variations and improvements can be made, which should also be regarded as the scope of protection of this application. These will not affect the effect of the implementation of this application and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for producing an ultra-fast cooling zone for thin steel strip, wherein the ultra-fast cooling zone comprises multiple groups of cold headers, characterized in that: The method includes determining a temperature control region of the strip steel and a corresponding cooling mode for the temperature control region based on the thickness of the strip steel; cooling the temperature control region based on the cooling mode; performing temperature compensation on the temperature control region based on the temperature after cooling of the temperature control region to obtain a target strip steel; The determining the temperature control region of the strip steel based on the thickness of the strip steel includes comparing the thickness of the strip steel with a set critical value and determining the temperature control region according to the comparison result; The comparing the thickness of the strip steel with a set critical value and determining the temperature control region according to the comparison result includes comparing the thickness D0 of the strip steel with a set first critical value D1 = 3 mm and a set second critical value D2 = 5 mm; when D1 < D0 ≤ D2 is satisfied, determining a range where the length L of the front section of the strip steel is ≤ 5 m as the first temperature control region; when D0 ≤ D1 is satisfied, determining a range where the length L of the front section of the strip steel is ≤ 10 m as the second temperature control region; The determining the corresponding cooling mode for the temperature control region includes calculating and obtaining the corresponding cooling mode for the temperature control region through a post-rolling cooling feedforward model; The cooling mode for the first temperature control region is a weak cooling mode; The cooling mode for the second temperature control region is a non-cooling mode.

2. The method for producing an ultra-fast cooling zone for thin steel strip according to claim 1, characterized in that: The determining the corresponding cooling mode for the temperature control region based on the thickness of the strip steel includes determining a target cooling header to be pre-opened based on the thickness of the strip steel; when the end of the temperature control region passes by the target cooling header, opening the corresponding target cooling header.

3. The method for producing an ultra-fast cooling zone for thin steel strip according to claim 1, characterized in that: The performing temperature compensation on the temperature control region based on the temperature after cooling of the temperature control region includes acquiring the temperature of the temperature control region; performing temperature compensation on the temperature control region through the post-rolling cooling feedforward model based on the temperature of the temperature control region.

4. The method for producing an ultra-fast cooling zone for thin steel strip according to claim 1, characterized in that: The method further includes, after obtaining the target strip steel setting a sample region based on the steel grade of the strip steel; obtaining an ultra-fast cooling self-learning model for the sample region based on the thickness of the strip steel and the data of the temperature compensation.

5. A production device for ultra-fast cooling of thin steel strip, characterized in that: including a calculation module for determining a temperature control region of the strip steel and a corresponding cooling mode for the temperature control region based on the thickness of the strip steel; a cooling module for cooling the temperature control region based on the cooling mode; a compensation module for performing temperature compensation on the temperature control region based on the temperature after cooling of the temperature control region to obtain a target strip steel; The determining the temperature control region of the strip steel based on the thickness of the strip steel includes comparing the thickness of the strip steel with a set critical value and determining the temperature control region according to the comparison result; The comparing the thickness of the strip steel with a set critical value and determining the temperature control region according to the comparison result includes comparing the thickness D0 of the strip steel with a set first critical value D1 = 3 mm and a set second critical value D2 = 5 mm; when D1 < D0 ≤ D2 is satisfied, determining a range where the length L of the front section of the strip steel is ≤ 5 m as the first temperature control region; when D0 ≤ D1 is satisfied, determining a range where the length L of the front section of the strip steel is ≤ 10 m as the second temperature control region; Determining the cooling mode corresponding to the temperature control area includes calculating and obtaining the cooling mode corresponding to the temperature control area through a post-rolling cooling feedforward model; The cooling mode of the first temperature control area is a weak cooling mode; The cooling mode of the second temperature control area is a non-cooling mode.

6. An electronic device 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 method steps according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method steps according to any one of claims 1 to 4 are implemented.

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