A cooling method for forming multiple daughter steel plates with different properties from a master steel plate.

Abstract

This invention discloses a cooling method for forming multiple daughter steel plates with different properties from a master steel plate. The method involves zoned cooling of different sections of the same master steel plate, including: micro-tracking and macro-tracking, which tracks the position of the master steel plate by calculating the roller speed and correcting deviations caused by roller wear using a hot metal detector; temperature drop rate control, which controls the cooling rate of the master steel plate by adjusting the cooling water volume and roller speed; zoned cooling control, which performs zoned cooling of the master steel plate by adjusting the opening of the valve in the cooling distribution water pipe; and shearing to form daughter plates, which, by controlling the shearing process after the cooling process, yields multiple daughter plates of the same or different sizes with different microstructures and properties. This invention calculates the cutting length of the master steel plate and uses a controlled cooling system to cool sections of the master steel plate in segments, thereby obtaining multiple master steel plates with different microstructures and properties, flexibly responding to current market demands.

Description

Technical Field

[0001] This invention relates to the field of hot-rolled strip processing, and more particularly to a cooling method for forming a variety of daughter steel plates with different properties from a master steel plate. Background Technology

[0002] Both domestically and internationally, the common practice for controlled cooling after rolling of medium-thick steel plates is to apply different cooling modes to the same steel plate to refine the grains and enhance the strength and toughness of the steel plate. However, there is currently no technology that can implement personalized cooling for different sections of the same steel plate to obtain steel plates with various microstructures and properties.

[0003] Current steel plate manufacturing technology mainly focuses on optimizing overall performance by controlling the overall cooling rate and method to adjust the microstructure and properties of the steel plate. This method has achieved significant results in improving the overall performance of steel plates, and has important applications in increasing strength, improving plasticity, and enhancing wear resistance.

[0004] However, with the increasing demand for high-performance materials, researchers and engineers have begun to explore more sophisticated cooling control technologies. The introduction of personalized cooling technology could be revolutionary, precisely controlling the cooling rate and method according to the specific requirements of different parts of a steel sheet, thereby achieving a variety of different microstructures and properties on the same sheet. This technology not only meets the requirements of specific industrial applications but also enhances the overall plasticity and adaptability of steel, providing a wider range of choices and optimization possibilities for engineering design. Summary of the Invention

[0005] To address the aforementioned technical problem of obtaining steel plates with various microstructures and properties from different sections of the same steel plate, this invention provides a cooling method for forming multiple daughter steel plates with different properties from a parent steel plate. This invention primarily combines micro-tracking technology (basic automation) and macro-tracking technology (process automation) during the cooling process. By calculating the slitting length of the steel plate and then using a controlled cooling system to cool sections of the steel plate in segments, multiple steel plates with different microstructures and properties can be obtained.

[0006] The technical means employed in this invention are as follows:

[0007] A cooling method for forming multiple daughter steel plates with different properties from a master steel plate, comprising the following steps: (The method involves zone cooling of different sections of the same master steel plate.)

[0008] Micro-tracking and macro-tracking track the position of the steel plate by calculating the roller speed and using a hot metal detector to correct errors caused by roller wear.

[0009] Temperature drop rate control: The cooling rate of the steel plate is controlled by adjusting the cooling water volume and roller speed according to the required steel plate properties.

[0010] Zoned cooling control involves adjusting the opening of the valves in the cooling water distribution pipes to cool the steel plates in different zones according to different performance requirements, so as to achieve performance differences in different areas on the same steel plate.

[0011] Shearing forms sub-plates. By controlling the shearing process after the cooling process, multiple sub-plates of the same or different sizes with different microstructures and properties can be obtained.

[0012] Furthermore, the hot metal detector is located at the inlet, middle, and outlet of the controlled cooling process area.

[0013] Furthermore, the micro-tracking and macro-tracking, along with the temperature drop rate control, are all controlled by a PLC program that controls the cooling process.

[0014] Furthermore, the cooling water distribution manifold water flow regulating valve can adjust the water flow according to the required water consumption of the required performance sub-board.

[0015] Furthermore, the speed of the cooling process conveyor rollers can be adjusted synchronously according to the adjustment of the water volume regulating valve of the cooling diversion water collection pipe.

[0016] Furthermore, depending on the steel grade and thickness of the steel plate, the roller speed of the controlled cooling process is 1.2-1.5 m / s; the opening degree of the regulating valve of the cooling diversion water collection pipe is 15-18%; and the set water flow rate of the upper cooling diversion water collection pipe is 200-225 m³ / s. 3 The required number of cooling water distribution manifolds to be opened is 2-7; the total water volume of the cooling water distribution manifolds is 1400-5520m³. 3 The final rolling temperature is 820-1050℃.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention provides a cooling method for forming multiple daughter steel plates with different properties from a master steel plate, which can obtain multiple daughter steel plates with different microstructures and properties from the same master steel plate, and flexibly meet the current market demand.

[0019] 2. The present invention provides a cooling method for forming a variety of daughter steel plates with different properties from a master steel plate, which can effectively save billets and reduce the production of spot steel plates in actual production.

[0020] 3. The present invention provides a cooling method for forming multiple daughter steel plates with different properties from a master steel plate. Compared with the traditional method where a single steel plate can only produce a steel plate with one property, this method can effectively reduce the consumption of energy such as water and electricity.

[0021] Based on the above reasons, this invention can be widely promoted in the field of hot-rolled strip processing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic flowchart of a cooling method for forming multiple daughter steel plates with different properties from a mother steel plate, according to an embodiment of the present invention. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] like Figure 1As shown, this invention provides a cooling method for forming multiple daughter steel plates with different properties from a master steel plate, which involves partitioned cooling of different sections of the same steel plate, including the following steps:

[0032] Micro-tracking and macro-tracking track the position of the steel plate by calculating the roller speed and using a hot metal detector to correct errors caused by roller wear.

[0033] Temperature drop rate control: The cooling rate of the steel plate is controlled by adjusting the cooling water volume and roller speed according to the required steel plate properties.

[0034] Zoned cooling control involves adjusting the opening of the valves in the cooling water distribution pipes to cool the steel plates in different zones according to different performance requirements, so as to achieve performance differences in different areas on the same steel plate.

[0035] Shearing forms sub-plates. By controlling the shearing process after the cooling process, multiple sub-plates of the same or different sizes with different microstructures and properties can be obtained.

[0036] Furthermore, taking Q235B steel plates and Q355B steel plates with thicknesses of 15.65mm, 17.65mm, and 19.65mm as examples:

[0037]

[0038] Furthermore, after the steel billet is rolled into a steel plate by the rolling mill, its transfer process enters the micro-tracking and macro-tracking modes of the controlled cooling process. The micro-tracking mode calculates the transfer speed of the steel plate in the controlled cooling process by controlling the roller diameter of the roller conveyor and the rotation speed of the roller motor by the roller motor frequency converter, and thus obtains the real-time position of the steel plate in the controlled cooling process range.

[0039] Furthermore, the formula for calculating the rotational speed of the roller conveyor motor is as follows:

[0040] v = 2πr / T

[0041] Where v is the conveying speed of the steel plate on the conveyor rollers in the controlled cooling process, r is the radius of the conveyor rollers, and T is the operating cycle of the conveyor rollers.

[0042] Furthermore, in the macro tracking mode, when the steel plate passes through the three hot metal detectors in the controlled cooling process section, the trigger signal of the hot metal detector is used to determine and correct the error in the micro tracking calculation of the steel plate position in the controlled cooling process transmission roller section caused by the different wear of the roller diameter due to the different linear speed of the rollers.

[0043] Furthermore, the hot metal detector is located at the inlet, middle, and outlet of the controlled cooling process area.

[0044] Furthermore, the micro-tracking and macro-tracking, along with the temperature drop rate control, are all controlled by a PLC program that controls the cooling process.

[0045] Furthermore, the cooling water distribution manifold water flow regulating valve can adjust the water flow according to the required water consumption of the required performance sub-board.

[0046] Furthermore, when the steel plate enters the controlled cooling diversion water collection pipe group section, the temperature drop rate of the steel plate is controlled by increasing or decreasing the water output of the controlled cooling diversion water collection pipe and increasing or decreasing the speed of the controlled cooling process conveyor roller, according to the required steel plate performance.

[0047] Furthermore, the speed of the cooling process conveyor rollers can be adjusted synchronously according to the adjustment of the water volume regulating valve of the cooling diversion water collection pipe.

[0048] Furthermore, when the steel plate reaches the required length of the sub-plate with the desired microstructure and properties, the water volume regulating valve of the cooling diversion water collection pipe is controlled to adjust the required water volume and open according to the different microstructure and properties of the sub-plate, and the speed of the cooling process conveyor roller is controlled to be adjusted synchronously to cool the steel plate.

[0049] Furthermore, after the Q355B steel plate is rolled, it enters the controlled cooling distribution water collection pipe section. The speed of the controlled cooling process roller is set to 1.351 m / s, and the water flow regulating valve of the controlled cooling distribution water collection pipe is set to 5513 m. 3 The water flow setting and opening are activated to cool the steel plate; when the steel plate reaches the required length for the Q355B sub-plate, the water flow regulating valve of the cooling diversion water collection pipe is controlled according to the required 1400m length for the Q235B sub-plate. 3 The water flow is adjusted and the opening is opened. The speed of the cooling process conveyor rollers is synchronously adjusted to 1.5 m / s to cool the steel plate. This process is repeated to obtain multiple sub-plates with different microstructures and properties from the same steel plate after the shearing process.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cooling method for forming multiple daughter steel plates with different properties from a master steel plate, characterized in that, Different sections of the same steel plate are cooled in separate zones, including the following steps: Micro-tracking and macro-tracking track the position of the steel plate by calculating the roller speed and using a hot metal detector to correct errors caused by roller wear. Temperature drop rate control: The cooling rate of the steel plate is controlled by adjusting the cooling water volume and roller speed according to the required steel plate properties. Zoned cooling control involves adjusting the opening of the valves in the cooling water distribution pipes to cool the steel plates in different zones according to different performance requirements, so as to achieve performance differences in different areas on the same steel plate. Shearing forms sub-plates. By controlling the shearing process after the cooling process, multiple sub-plates of the same or different sizes with different microstructures and properties can be obtained.

2. The cooling method for forming multiple daughter steel plates with different properties from a mother steel plate according to claim 1, characterized in that: The hot metal detector is located at the inlet, middle and outlet of the controlled cooling process area.

3. The cooling method for forming multiple daughter steel plates with different properties from a mother steel plate according to claim 1, characterized in that: The micro-tracking and macro-tracking, along with the temperature drop rate control, are all controlled by a PLC program that controls the cooling process.

4. The cooling method for forming multiple daughter steel plates with different properties from a mother steel plate according to claim 1, characterized in that: The cooling water distribution manifold water flow regulating valve can adjust the water flow according to the required water consumption of the required performance sub-board.

5. The cooling method for forming multiple daughter steel plates with different properties from a mother steel plate according to claim 1, characterized in that: The speed of the conveyor rollers in the cooling process can be adjusted synchronously according to the water volume regulating valve of the cooling diversion water collection pipe.

6. A cooling method for forming multiple daughter steel plates with different properties from a mother steel plate according to claim 5, characterized in that: Depending on the steel grade and thickness of the steel plate, the roller speed of the controlled cooling process is 1.2-1.5 m / s; the opening degree of the regulating valve of the cooling diversion water collection pipe is 15-18%. The upper cooling manifold is set to handle 200-225m³ of water. 3 The required number of cooling water distribution manifolds to be opened is 2-7; the total water volume of the cooling water distribution manifolds is 1400-5520m³. 3 The final rolling temperature is 820-1050℃.

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