A method for correcting weight deviation of cut billets caused by abrasion of a continuous casting mold copper tube

Abstract

The application provides a correction method for weight deviation caused by cutting blank of continuous casting crystallizer copper pipe wear, comprising the following steps: step one: checking the crystallizer copper pipe replacement information of each flow of the casting machine before casting; step two: accumulating the steel passing amount data of the crystallizer copper pipe of each flow according to the actual steel passing amount during the casting process; step three: setting the steel passing amount correction model to correct the cutting fixed length of the casting blank; step four: measuring the fixed length of the casting blank through the high-definition infrared fixed length system in the intelligent cutting system, and cutting through the shearing device; step five: after the fixed cutting of the casting blank of each flow, the online weighing is carried out, the preset weight is compared, and the subsequent casting blank fixed length is corrected after feedback correction. The application corrects the influence of the copper pipe steel passing wear of different flow times on the cutting weight through the copper pipe steel passing amount correction model, effectively improves the qualified rate of the continuous casting blank after cutting, reduces the casting blank cutting loss, and improves the overall yield of the continuous casting process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of continuous casting billet weight and size control, and particularly relates to a correction method for cutting billet weight deviation caused by continuous casting crystallizer copper pipe wear. BACKGROUND

[0002] The continuous casting billet sizing technology is a technology of cutting the continuous and uninterrupted casted billet into a fixed length online, and is the last necessary process of the continuous casting production. The cross-sectional size of the wide and thick plate billet is about (200-300) mm x (1500-2200) mm. The cross-sectional size of the billet is large. According to the calculation, if the length direction sizing accuracy of the billet fluctuates between 20-60 mm, the quality of the billet after sizing will have a quality fluctuation of 40-300 kg. The quality fluctuation is large. If the wide and thick plate billet sizing is not accurate, a large amount of steel material will be wasted.

[0003] The existing technology for improving the sizing accuracy is to detect the distance between the end of the billet and the cutting device through infrared rays, encoders, laser rays and other devices. If the distance is equal to the sizing distance, cutting is performed. However, these technologies are from the perspective of improving the measurement accuracy of the sizing distance to improve the sizing accuracy, and the influence of the wear of the inner cavity of the crystallizer copper pipe on the sizing accuracy is not considered.

[0004] There is a friction force between the inner cavity of the crystallizer copper pipe and the billet shell during the continuous casting process. The friction between the inner cavity of the copper pipe and the billet shell causes the continuous wear of the inner cavity of the copper pipe, thereby causing the change of the shape of the inner cavity of the crystallizer copper pipe and the section surface. The wear degree of the inner cavity of the copper pipe is directly affected by the different steel passing periods of the continuous casting machine, and the change of the section surface has a great influence on the stability of the billet weight. The single billet weight is required to be as stable as possible in the rolling process. The great deviation of the billet weight brings great difficulty to the control of the sizing rate and the yield rate of the next process, and it is urgent to take a measure to eliminate the influence of the section surface change caused by the wear of the inner cavity of the copper pipe.

[0005] CONTENT

[0006] The present application is carried out in view of the above-mentioned problems. The purpose is to provide a correction method for cutting billet weight deviation caused by continuous casting crystallizer copper pipe wear. The sizing length of the billet is measured by the high-definition infrared sizing system, and the copper pipe steel passing wear correction model is set to correct the influence of the copper pipe steel passing wear on the cutting weight of different flow times. The qualified rate of the continuous casting billet after cutting is effectively improved, the cutting loss of the billet is reduced, and the overall yield rate of the continuous casting process is improved.

[0007] Specifically, the first aspect of the present application provides a correction method for cutting billet weight deviation caused by continuous casting crystallizer copper pipe wear, including the following steps:

[0008] Step one: check the information of the mold copper pipe of each flow before casting, preset the cutting length of the casting blank and set the weight;

[0009] The mold copper pipe is a core component of the continuous casting machine, which plays a role in solidification of molten steel. The quality of the mold copper pipe not only has a great influence on the yield and quality of the casting blank, but also has a greater impact on the service life of the copper pipe itself. In the process of continuous casting, the inner surface of the mold copper pipe is in contact with the high-temperature molten steel, which is affected by chemical corrosion, thermal erosion, and friction between the billet shell, etc. The mold copper pipe is prone to thermal deformation and surface plating scratches, which affects the normal operation of the continuous casting machine, reduces the continuous casting efficiency, and worsens the quality of the casting blank. Due to the difference in steel grade and process parameters of the continuous casting machine, the service life of the mold copper pipe is also different.

[0010] Step two: accumulate the copper pipe steel flow data of each flow according to the actual steel flow during casting;

[0011] Step three: receive the steel flow data through the continuous casting blank weight and length intelligent cutting system, set the steel flow correction model to correct the cutting length of the casting blank, and the formula is as follows:

[0012] L = 133 - K * X 2 *10 -3 ;

[0013] Wherein: L: copper pipe steel flow correction length, mm;

[0014] X: copper pipe steel flow, furnace; K: correction coefficient;

[0015] In this formula, the unit of copper pipe steel flow X is furnace, which records how many furnaces of molten steel flow through the copper pipe.

[0016] The function of the six-flow roller scale is to accurately measure the weight and quantity of the billet and finished rolled material. This weighing system is an online static weighing measurement system designed, manufactured and installed according to the site process design, which is specially designed for the special measurement requirements of steel enterprises in the production process of billet and finished rolled material.

[0017] The function of Jia Yong non-contact automatic sizing and positioning system is to realize accurate measurement and positioning of plate in wide and heavy plate continuous casting machine by using non-contact camera technology. The software automatically calculates the actual size of the plate by analyzing the image data captured by the camera, and makes corresponding adjustments and controls, thereby improving the automation level of the production process and the consistency of the products.

[0018] Step four: measure the cutting length of the casting blank through the high-definition infrared sizing system in the intelligent cutting system, and cut through the shearing device when the cutting length detected meets the corrected cutting length.

[0019] Step five: after the on-line weighing of each flow of the billet cutting, the preset weight is compared and the subsequent billet cutting length is corrected after feedback.

[0020] Further, the crystallizer copper pipe replacement information of each flow of the caster is checked, specifically including: the flow of the new copper pipe is recorded as 0, the copper pipe used after the off-line maintenance is recorded according to the number of steel passing before off-line, and the copper pipe is not changed.

[0021] Further, the preset billet cutting length and the set weight are in a positive correlation.

[0022] Further, the actual steel passing amount of each flow of the crystallizer copper pipe is accumulated, specifically including: when the flow is normally operated, the steel passing data is automatically accumulated; when the flow is faulted or blocked according to the plan, the system monitors that the flow speed is 0, and the steel passing amount of the flow is not accumulated.

[0023] Further, the value range of the correction coefficient K is 0.35-0.6.

[0024] Further, the value of the correction coefficient K decreases with the increase of the steel passing amount.

[0025] The value range is selected according to the fact that the wear of the inner cavity of the copper pipe during the steel pouring process is not uniformly changed with the increase of the steel passing amount, the real-time wear of the copper pipe decreases with the increase of the steel passing amount, the wear amount changes greatly every 70-100 furnace of molten steel, and the value of the correction coefficient is adjusted according to the change of the wear amount.

[0026] Further, the cutting error of the high-definition infrared cutting system is ±10mm.

[0027] Further, the cutting device is a hydraulic cutting device.

[0028] The hydraulic cutting device is based on a hydraulic system, and by means of the moving upper blade and the fixed lower blade, a reasonable blade gap is adopted to exert a shearing force on various thicknesses of metal plates, so that the plates are broken and separated according to the required size. It is a machine for cold shearing various shaped steel and various metal structures to meet production needs.

[0029] Secondly, this application also provides a computing device that has the functionality to implement the method described in the first aspect. The beneficial effects are described in the first aspect and will not be repeated here. The functionality can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functionality. In one possible design, the device structure includes an acquisition module, a training module, and optionally, a construction module. These modules can implement the function of training nodes in the method example of the first aspect, as detailed in the method example, and will not be repeated here.

[0030] Thirdly, this application also provides a computing device for implementing the functions of the method described in the first aspect above. The beneficial effects are described in the first aspect and will not be repeated here. The computing device includes a processor and a memory, with the memory storing instructions and / or data. The memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, it can implement the function of the training node in the example of the first aspect above. The computing device also includes a communication interface for communicating with other devices.

[0031] Fourthly, this application also provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the methods described in the first aspect and various possible designs of the first aspect.

[0032] Fifthly, this application also provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods described in the first aspect and various possible designs of the first aspect.

[0033] In a sixth aspect, this application also provides a computing chip connected to a memory, which is used to read and execute a software program stored in the memory to perform the methods described in the first aspect and various possible implementations of the first aspect. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this drawing 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 of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 A flowchart illustrating the steps of a method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer;

[0036] Figure 2 A continuous casting data chart without correction using the present application;

[0037] Figure 3 A continuous casting data chart with correction using the present application;

[0038] Figure 4 A weight adjustment comparison chart for experimental rolling of a Ф28~Ф32 size steel.

[0039] The object, features and advantages of the present drawings will be further illustrated in conjunction with the embodiments, with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] In order to make the object, technical scheme and advantages of the present application more clear, the present application will be described and explained in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0041] Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can be applied to other similar scenarios without creative labor on the basis of these drawings. In addition, it can be understood that although the efforts made in this development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes on the basis of the technical content disclosed in the present application are only routine technical means, and should not be understood as insufficient disclosure of the present application.

[0042] All embodiments and optional embodiments of the present application can be combined to form new technical solutions if not specifically stated.

[0043] All technical features and optional technical features of the present application can be combined to form new technical solutions if not specifically stated.

[0044] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0045] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0046] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0047] To better understand the solutions of the embodiments of this application, some related terms and concepts that may be involved in the embodiments of this application will be introduced below.

[0048] (1) Continuous Casting: In continuous casting, molten metal is transformed into solid metal material through continuous pouring and cooling. Specifically, molten metal is poured into a water-cooled crystallizer, where it gradually solidifies into a billet. The billet is then continuously pulled out from below the crystallizer and cooled to obtain the desired shape and size of metal material. The crystallizer is one of the key pieces of equipment in continuous casting, its function being to shape the molten metal into a specific shape and size during the cooling and solidification process. Crystallizers are typically made of copper or steel and have internal cooling water channels, through which the metal solidifies.

[0049] like Figure 1 As shown in this embodiment, a method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer includes the following steps:

[0050] Step 1: Before casting, check the replacement information of the copper tubes of the crystallizer for each flow of the casting machine, and preset the cut length and weight of the billet.

[0051] The crystallizer copper pipe is the core component of the continuous casting machine, which bears the role of solidification of molten steel. The quality of the crystallizer copper pipe has a great influence on the yield and quality of the cast slab, and has a greater influence on the service life of the copper pipe itself. In the process of continuous casting, the inner surface of the crystallizer copper pipe is in contact with the high-temperature molten steel, which is affected by chemical corrosion, thermal erosion, and friction between the billet shell, etc. The crystallizer copper pipe is prone to thermal deformation and surface plating scratches, which affects the normal operation of the continuous casting machine, reduces the continuous casting efficiency, and worsens the quality of the cast slab. Due to the different steel grades and process parameters of the continuous casting machine, the service life of the crystallizer copper pipe is also different.

[0052] Step two: During the casting process, the crystallizer copper pipe steel flow data of each flow is accumulated according to the actual steel flow;

[0053] Step three: The steel flow data is received by the continuous casting slab weight and size intelligent cutting system, the steel flow correction model is set to correct the cutting size length of the cast slab, and the formula is as follows:

[0054] L = 133 - K * K 2 *10 -3 ;

[0055] Wherein: L: copper pipe steel flow correction size length, mm;

[0056] X: copper pipe steel flow, furnace; K: correction coefficient;

[0057] In this formula, the unit of copper pipe steel flow X is furnace, which records how many furnaces of molten steel flow through the copper pipe.

[0058] In this embodiment, the continuous casting slab weight and size intelligent cutting system used includes SCS-5t x 6-GDC type six-stream roller scale and Jia Yong non-contact automatic sizing and positioning system, which includes high-definition infrared sizing system and shearing device.

[0059] The main function of the six-stream roller scale is to accurately measure the weight and quantity of the billet and finished rolled material. This weighing system is an online static weighing and measuring system designed, manufactured and installed according to the site process design, which is specially designed for the special measurement requirements of steel enterprises in the production process of billet and finished rolled material.

[0060] The function of Jia Yong non-contact automatic sizing and positioning system is to realize accurate measurement and positioning of plate in wide and heavy plate continuous casting machine by using non-contact camera technology. The software automatically calculates the actual size of the plate by analyzing the image data captured by the camera, and makes corresponding adjustment and control, so as to improve the automation level of the production process and the consistency of the product.

[0061] Step 4: Measure the fixed length of the cast billet using the high-definition infrared sizing system in the intelligent cutting system. When the fixed length is detected to match the corrected cutting fixed length, cut the billet using the shearing device.

[0062] Step 5: After each batch of cast billets is cut to length, it is weighed online, compared with the preset weight, and feedback is used to correct the length of subsequent cast billets.

[0063] In this embodiment, as Figures 2-3 As shown in the figure, the fixed weight fine-tuning is the feedback correction of the subsequent billet fixed length. The fixed weight fine-tuning is calculated by subtracting the theoretical length from the actual length, and is used to fine-tune the billet fixed length.

[0064] Furthermore, the replacement information of the copper tubes in the crystallizers of each flow of the casting machine is checked. Specifically, this includes: the steel throughput data of the flow with the new copper tube is entered as 0; the copper tubes used after being taken offline for maintenance due to an accident are entered with the steel throughput data before going offline; and no changes are made to the copper tubes that have not been replaced.

[0065] Furthermore, the preset blank cutting length and the preset weight are positively correlated.

[0066] Furthermore, the steel throughput data of each crystallizer copper tube is accumulated based on the actual steel throughput. Specifically, when the flow is running normally, the steel throughput data is automatically accumulated; when the flow fails or is blocked as planned, the system detects that the flow rate is 0 and then stops accumulating the steel throughput of that flow.

[0067] Furthermore, the correction coefficient K ranges from 0.35 to 0.6.

[0068] Furthermore, the value of the correction factor K decreases with increasing steel throughput.

[0069] The selection of the value range is based on the following: the wear of the inner cavity of the copper tube during the steel pouring process does not change uniformly with the increase of the steel flow. The real-time wear of the copper tube decreases with the increase of the steel flow. Every 70 to 100 heats of molten steel, there is a significant change in the amount of wear. The value of the correction coefficient is adjusted accordingly based on the change in the amount of wear.

[0070] In this embodiment, the values ​​of the correction coefficient K are shown in Table 1:

[0071] Table 1. Value of correction factor K varies with the amount of steel passed.

[0072]

[0073]

[0074] The unit of steel throughput X is furnace. In this embodiment, the weight of one furnace of molten steel is 100 tons.

[0075] Further, the sizing error of the high-definition infrared sizing system is ±10mm.

[0076] Further, the shearing device is a hydraulic shearing device.

[0077] The hydraulic shearing device is a machine based on a hydraulic system, by virtue of a moving upper blade and a fixed lower blade, and by adopting a reasonable blade gap, to exert a shearing force on metal plates of various thicknesses, so that the plates are broken and separated according to the required size, and is used for cold shearing of various shaped steel and various metal structures to meet production requirements.

[0078] In this embodiment, as shown in Figure 2 When the weight deviation correction is not performed by using the correction method of the present application, the absolute values of the weight deviations of 5 flow times are 10kg or more, and the absolute value of the maximum deviation reaches 29kg, causing great waste of steel materials.

[0079] As shown in Figure 3 After the weight deviation correction is performed by using the correction method of the present application, the absolute values of the weight deviations of only one flow time are 5kg or more, and the absolute value of the maximum deviation is 9kg, greatly reducing the deviation rate and the deviation degree.

[0080] When the weight deviation correction is not performed by using the correction method of the present application, the qualified rate of the absolute values of the deviations in the continuous casting process is only 21% on average, and the single-strand weight fluctuation of the sizing control is great, which greatly affects the subsequent rolling work.

[0081] In this embodiment, after the weight deviation correction is performed by using the correction method of the present application, the total cutting number of the caster with the caster number C3 is 19465, the weighing number is 19238, the number of the absolute values of the deviations within 5kg is 16702, the qualified rate is 86.82%, the number of the absolute values of the deviations within 4kg is 14280, the qualified rate is 74.23%, the number of the absolute values of the deviations within 3kg is 11791, the qualified rate is 61.29%, and the number of the absolute values of the deviations within 2kg is 9073, the qualified rate is 47.16%.

[0082] After the weight deviation correction is performed by using the correction method of the present application, the slab qualified rate of the sizing and weight process in the continuous casting work is greatly improved, the utilization rate of the steel material is improved, and the resource waste is reduced.

[0083] As shown in Figure 4As shown, when the steel of Ф28-Ф32 specification is tested, the weight adjustment distribution of the original size rolling method is shown as the red curve, the weight adjustment distribution after using the correction method of the present application is shown as the blue curve, the black solid line is the target weight, which is 2500 kg; the red dotted line is the original weight setting value, which is 2530 kg, and the allowance is 30 kg; the blue dotted line is the setting value after correction and optimization. After correction and optimization, the consistency of the billet weight is improved, the weight setting point is moved to the left to 2520 kg, the average of each billet is reduced by 10 kg, the non-size and the cutting loss part is more converted into the size material, 42 furnaces of steel are tested for rolling, and the average material yield is increased by 0.58%.

[0084] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and embodiments having the same technical idea and playing the same role and effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications of the embodiments that can be thought of by those skilled in the art, and other ways constructed by combining part of the constituent elements of the embodiments are also included in the scope of the present application.

Claims

1. A method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer, characterized in that, Includes the following steps: Step 1: Before casting, check the replacement information of the copper tubes of the crystallizer for each flow of the casting machine, and preset the cut length and weight of the billet. Step 2: During the casting process, accumulate the steel throughput data of the copper tubes in the crystallizer for each flow based on the actual steel throughput. Step 3: Receive the steel throughput data through the continuous casting billet fixed-weight and fixed-length intelligent cutting system, and set the steel throughput correction model to correct the fixed-length cutting of the billet. The formula is as follows: ； Where: L: Corrected length of copper tube for steel passage, mm; X: Copper tube steel throughput, furnace; K: Correction factor; The weight of one furnace of molten steel is 100 tons; The value of the correction coefficient K varies with the amount of steel X as shown below: Step 4: Measure the fixed length of the cast billet using the high-definition infrared fixed-length system in the intelligent cutting system. When the fixed length is detected to match the corrected cutting fixed length, cut the billet using the shearing device. Step 5: After each batch of cast billets is cut to length, it is weighed online, compared with the preset weight, and feedback is used to correct the length of subsequent cast billets.

2. The method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer according to claim 1, characterized in that, The verification of the replacement information of the copper tubes of the crystallizer for each flow of the casting machine includes: entering the steel throughput data of the flow with the new copper tube as 0; entering the steel throughput data of the copper tube used after the machine was shut down for maintenance due to an accident as before the machine was shut down; and not making any changes to the copper tubes that were not replaced.

3. The method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer according to claim 1, characterized in that, The preset blank cutting length and the set weight are positively correlated.

4. The method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer according to claim 1, characterized in that, The method of accumulating the steel throughput data of each flow's copper tube based on the actual steel throughput specifically includes: automatically accumulating the steel throughput data when the flow is running normally; and when the flow fails or is blocked as planned, if the system detects that the flow rate is 0, then the steel throughput data for that flow will no longer be accumulated.

5. The method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer according to claim 1, characterized in that, The measurement error of the high-definition infrared measuring system is ±10mm.

6. The method for correcting the deviation in the fixed weight of cut billets caused by wear of copper tubes in a continuous casting crystallizer according to claim 1, characterized in that, The shearing device is a hydraulic shearing device.

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