Universal cutting method for all-casting machine

Abstract

The invention discloses a universal cutting method for an all-casting machine. The universal cutting method comprises the steps that the all-casting machine is controlled; the all-casting machine comprises pouring equipment, cutting equipment and steel billet transferring equipment. The control step comprises the steps of calculating the length of molten steel of the whole furnace of steel in the fan-shaped section and the total weight of the molten steel of the large ladle as the amount of the molten steel of the fan-shaped section by utilizing a large ladle molten steel casting signal and the stock change of the molten steel of the tundish; the real-time casting blank length, the steel casting length instantaneous values corresponding to the steel head and the blank tail and the steel casting length range, obtained in the step A, of the molten steel of each furnace in the fan-shaped section are matched with the continuous starting and ending positions of each steel blank; the billet circulation module simulates billet circulation by combining billet data with each roller way operation signal, and matches the group of slabs according to the molten steel number of the corresponding smelting furnace number. The problem that finished steel billets with quality problems cannot be effectively and accurately positioned to corresponding molten steel sources due to inconsistent information matching between the steel billets and the corresponding molten steel during steel drawing of existing steel plate square billets can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel manufacturing, and in particular to a universal cutting method for timely and accurately matching steel billets with corresponding molten steel sources during the steel plate billet production and drawing process during continuous casting on a full casting machine. Background Art

[0002] Continuous casting is a crucial process in steel production, transforming high-temperature liquid steel into solid, high-temperature ingots. Molten steel passes through the continuous casting machine's mold and is converted into solid, high-temperature ingots. Currently, after slabs are produced, the master dispatches a casting plan based on the total molten steel volume, matching each slab with its molten steel source information. After billets are produced, on-site finishing shop operators roughly calculate the expected number of billets per furnace based on the total molten steel volume. After the billets are assembled, they are assigned their respective molten steel source information, rounded off to the nearest integer. Synchronizing slab and billet information to the three-tiered Manufacturing Execution System (MES) platform enables the transfer of billet information between the steelmaking plant and various rolling mills, effectively improving billet traceability throughout the steelmaking process and leveraging information technology to track the corresponding molten steel source information. When any quality problems occur in the produced steel billets in the current or subsequent processes, the source of molten steel corresponding to the steel billet can be used to check the process and equipment index parameters through data transmission, optimize the process path parameters, ensure stable operation of the equipment, and thus greatly improve the yield rate of the casting billets, steadily improve the quality of the steel billets in the steelmaking process, and promote high-quality and high-volume production through full continuous casting.

[0003] Previously, secondary information collection was limited to the pouring of molten steel in the tundish in the continuous casting area. Billet information was largely based on manual matching or scheduling, which easily led to inconsistencies between the output billet and the source of the molten steel. Consequently, quality issues in the current or subsequent processes could not be effectively and accurately pinpointed to the source of the molten steel. Therefore, to ensure consistency between plate and billet information and molten steel source information, a logically sound and well-designed information technology approach was urgently needed to reduce information matching errors and meet the requirements of high-quality and high-volume production. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a universal cutting method for the entire casting machine to solve the problem that the information matching between the steel billet and the corresponding molten steel is inconsistent during the existing steel plate and square billet drawing process, resulting in the inability to effectively and accurately locate the finished steel billet with quality problems to the corresponding molten steel source.

[0005] In order to solve the above problems, the technical solution of the present invention is as follows: the universal cutting method for a full casting machine includes controlling a full casting machine; The full caster comprises a pouring device, a cutting device and a billet flow transfer device arranged in sequence; the pouring device comprises a tundish connected with the outlet of a ladle shroud; the outlet of a sector at the lower part of the tundish is connected with a crystallizer; the cutting device comprises a breakout straightener, a cutting device and a roller arranged in sequence; and the billet flow transfer device comprises a roller; The control step comprises: A. The cutting model pouring module calculates using the ladle opening signal and the change in the tundish steel content. After the ladle is opened, the amount of steel flowing into the tundish sector in a period of time is the sum of the difference in the weight of the ladle steel and the difference in the weight of the tundish steel in the period of time. The total length of the steel drawn in the continuous casting machine is obtained from the start of pouring to the end of pouring. The weight of the billet produced in each period of time is the product of the difference in the current real-time pouring length and the cross-sectional area of the billet multiplied by the weight density of the current pouring steel grade. The length of the tundish steel to be generated in the sector is equal to the weight of the tundish steel divided by the cross-sectional area of the billet. The length of the steel in the sector for the whole furnace is the sum of the length of the tundish steel to be generated in the sector and the total length of the steel drawn. The total weight of the ladle steel is the sum of the amount of steel in the sector and the weight of the tundish steel. The total weight of the ladle steel is also equal to the amount of steel required to form the billet in each period of time. B. The cutting model cutting module periodically acquires the real-time billet length and determines the instantaneous value of the pouring length corresponding to the steel head and the billet tail. The instantaneous value is matched with the pouring length range of each furnace in the sector obtained in step A, and the starting and ending positions of each billet are matched with the pouring length range. If the starting and ending positions of the billet are in an inclusive relationship, the corresponding parameter information of the billet is queried and assigned. If the starting and ending positions of the billet are in a non-inclusive relationship, i.e., the starting and ending length of the billet cannot be covered by the pouring length range of a certain furnace, the length of the billet is the length between the ending position and the starting position of the billet, and the corresponding furnace information of the matched billet is divided according to the pouring position of the starting and ending of the billet. C. The cutting model billet flow transfer module simulates the flow of the billet in the case of multiple flow production of the billet, combines multiple billets into a group of slabs, and assigns the corresponding furnace information to the group of slabs according to the simulation. If the furnace information obtained by the simulation of the slabs in the group of slabs is different, the furnace information of the group of slabs is assigned to the furnace with more slabs.

[0006] In the above technical solution, a more specific solution can be that in step B, the cutting model cutting module periodically acquires the real-time billet length using the first-level real-time point data transmission generated by the infrared camera.

[0007] Further, in step B, the cutting model cutting module determines the instantaneous value of the pouring length corresponding to the head and tail of the slab by using the flame cutting signal.

[0008] Further, in step B, the cutting model cutting module automatically matches the corresponding heat information of the slab according to the current start and end positions of the slab and the pouring length of each heat of molten steel.

[0009] Further, step C further includes: the cutting model slab flow transfer module simulates the flow transfer of the slab according to the running signal of each roller bed and assigns the slab group according to the corresponding heat information.

[0010] Compared with the prior art, the present application has the following beneficial effects: The pouring module of the present application calculates the amount of molten steel required by the slab and the pouring length range according to the opening signal of the ladle and the change of the molten steel inventory in the tundish; the cutting module periodically obtains the real-time length of the slab and determines the instantaneous value of the pouring length corresponding to the head and tail of the slab, so as to match the continuous start and end positions of each slab according to the pouring length range of each heat of molten steel in the sector obtained in step A; the slab flow transfer module simulates the flow transfer of the slab according to the running signal of each roller bed and assigns the slab group according to the molten steel number of the corresponding furnace, so that the slab can be matched with the corresponding molten steel source in time and accurately. After using the present application, the accuracy of the slab blocking is improved from 84% to 97%, which directly generates economic benefits of nearly 200,000 yuan per year, and solves the problem of low accuracy of slab information matching; solves the quality problem of the slab, which can be traced and investigated by using accurate data; and the quality of the slab in each process is fine controlled, which is refined from "per-furnace management" to "per-branch management". BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the front view of the pouring equipment and the cutting equipment according to an embodiment of the present application; Figure 2 is the top view of the slab flow transfer equipment according to an embodiment of the present application; DETAILED DESCRIPTION

[0012] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings: The present application is a general cutting method for a full caster.

[0013] As Figure 1 , Figure 2The full casting machine shown, including the casting equipment, cutting equipment and billet flow equipment arranged in sequence; the casting equipment includes the outlet of the ladle steel water funnel 1 connected with the tundish steel water funnel 2, the outlet of the fan-shaped section 2-1 at the lower part of the tundish steel water funnel 2 is connected with the crystallizer 3, and the infrared camera 4 is arranged at the inlet of the fan-shaped section 2-1; the cutting equipment includes the billet straightening machine 5, the cutting device 8 and the roller 7 arranged in sequence, and the billet 6 runs on the roller 7; the billet flow equipment includes one or more rollers 7 and roller drive equipment arranged side by side, a cooling bed beside the roller, a crane above the roller, a flame cutting device 9 on the roller 7, a billet turning machine arranged on one side of the roller, a billet pushing machine arranged at one end of the roller 7 and a billet pulling machine arranged at the other end; the casting equipment, the cutting equipment and the billet flow equipment are all connected with the control unit, and the cutting model casting module corresponding to the casting equipment, the cutting model cutting module corresponding to the cutting equipment and the cutting model billet flow module corresponding to the billet flow equipment are arranged in the control unit.

[0014] In view of the current existence of single-flow slab, double-flow slab, seven-flow bloom and eight-flow bloom casting machine models, a control application program is arranged in the control unit to realize the tracking of the whole process data from the ladle steel water to the formed billet.

[0015] The control program of the control unit includes a real-time monitoring interface, a historical data query interface, a real-time acquisition system and a real-time data acquisition database. The real-time acquisition system acquires the data of the molten steel and the billet in the full casting machine in real time during production, saves it into the real-time data acquisition database, and synchronously transmits the real-time data to the real-time monitoring interface. The field operator uses the historical data query interface to provide accurate billet full information traceability.

[0016] The control unit includes the following control steps: A. The cutting model casting module uses the ladle pouring signal and the change in tundish molten steel inventory to perform calculations. After the ladle pouring begins, the difference in ladle steel weight change per period is ΔT1, and the difference in tundish steel weight change per period is ΔT2. The amount of molten steel flowing into the tundish sector during that period is calculated as ΔT1 + ΔT2. Based on the molten steel volume in the sector, the real-time cross-sectional information of the sector, and the current real-time casting length of each strand in the sector, the required molten steel volume is calculated. The ladle steel volume is matched with the tundish steel volume in real time to determine the range of meters of steel drawn from each heat of molten steel in the continuous casting machine. The current real-time casting length difference is set to ΔL1, the cross-sectional area of ​​the billet is set to S, and the weight density of the currently cast steel grade is set to ρ. The real-time billet weight M produced per period is calculated as ΔL1 × S × ρ. Based on the real-time calculation of the billet weight produced per period, the length of steel poured in each heat of molten steel within the sector is calculated. From the beginning to the end of pouring, the total number of meters of steel drawn from each ladle of molten steel in the continuous casting machine is ΣΔL1. The total number of meters of steel drawn is also equal to the length of steel poured. Assuming that the weight of the tundish molten steel at the end of pouring is M2, the length of the tundish molten steel in the fan-shaped section can be predicted to be Lzb=M2 / S. From this, the length of the entire furnace of molten steel in the fan-shaped section can be calculated as Lzb+ΣΔL. The total weight of the ladle of molten steel is (ΔT1+ΔT2)+M2. The total weight of the ladle of molten steel is also equal to the amount of molten steel required to form a billet in real time in each period of time. Figure 1 shown.

[0017] B. Aiming at the multi-strand production of square billets (i.e. casting machines suitable for seven-strand and eight-strand square billets).

[0018] The cutting model cutting module uses the first-level real-time point data transmission generated by the infrared camera 4 to periodically obtain the real-time ingot length, and uses the flame cutting (collected by the flame cutting equipment 9) signal to determine the instantaneous value of the pouring length corresponding to the steel head and the ingot tail, so as to match it with the pouring length range of each furnace of molten steel in the fan-shaped segment obtained in step A, and use this pouring length range to match the continuous starting and ending positions of each steel billet; if the continuous starting and ending positions of the steel billets are inclusive, query and assign all parameter information of the production furnace number, production block number, and internal steel grade corresponding to the steel billet; if mixed pouring occurs (because after the ladle starts pouring, the ladle molten steel flows to the tundish as a buffer, and then flows from the tundish to the fan-shaped segment, when the pouring of the previous furnace ends and the pouring of the next furnace begins, the tundish molten steel will contain the two furnaces of steel The molten steel enters the fan-shaped section together, which is mixed pouring), then all parameter information of the production furnace number, production block number, and internal steel grade are determined according to the proportion of molten steel of different furnace numbers in the billet; if the continuous starting and ending lengths of the billet cannot be covered by the pouring length range of the molten steel of a certain furnace, let the starting position of the billet be L2, and let the ending position of the billet be L3, then the length of the billet is ΔLg=L3-L2, and then the furnace information corresponding to the billet is divided and matched according to the starting and ending pouring positions of the billet (the furnace information includes all parameter information such as production furnace number, production sub-furnace number, production block number, internal steel grade, etc.), that is, the furnace information such as the production furnace number and production sub-furnace number of the billet is divided according to the starting and ending pouring positions of the billet, and the furnace information is assigned and matched to the billet. (Because during the continuous pouring process, the pouring length of each furnace of molten steel is continuous, the end value of the pouring length of the current furnace is the starting value of the pouring length of the next furnace. Suppose the end value of the pouring length of the current furnace is M, the pouring length of the current furnace occupied by the billet is ΔLg1=M-L2, and the pouring length of the next furnace occupied by the billet is ΔLg2=ΔLg-ΔLg1. If ΔLg1≥ΔLg2, the billet belongs to the current furnace, otherwise it belongs to the next furnace).

[0019] For single-strand or double-strand billet production (i.e. casters suitable for single-strand billets and double-strand billets).

[0020] The cutting model cutting module is designed for the production of single-stream or double-stream slabs. After the cast strand is cut by the cutting device to produce a slab, the cutting model cutting module automatically matches the furnace information corresponding to the slab based on the current start and end positions of the slab and the historical pouring length of each furnace of molten steel. Some information such as material number and steel type are transmitted to the first-level point, so that the spraying machine can obtain the slab information as soon as possible and print it on the side of the slab. Assume that the end value of the pouring length of the current furnace is M, the pouring length of the current furnace occupied by the billet is ΔLg1=M-L2, and the pouring length of the next furnace occupied by the billet is ΔLg2=ΔLg-ΔLg1. If ΔLg1≥ΔLg2, the billet belongs to the current furnace, otherwise it belongs to the next furnace.

[0021] C. The cutting model billet flow module simulates billet flow for multi-strand billet production by combining the billet data generated in step B with the operating signals of each roller drive device in automatic mode. Seven billets are then combined into a slab, which is then transferred by the crane. (If an eight-strand billet caster is used for production, the slab formation principle of "seven billets per slab" is still followed.) The cast strand is cut to produce individual billets, which are then arranged on the roller conveyor in the order of cutting. Each time the steel turning machine operates, the first billet is lifted onto the cooling bed in sequence. Each time the steel pusher operates, all billets on the cooling bed are arranged in the order of the streams to form slabs of three or four. When the steel drawing machine operates, the current billet assembly is complete and the slab is pushed into the 1# lifting position. The flow of steel billets is simulated to obtain heat information of multiple steel billets, and the group of slabs is assigned according to the corresponding simulated heat information. If there are two different types of heat information obtained by slab simulation in the group of slabs, the group of slabs is assigned the heat information with the larger number of slabs, that is, the heat information of the group of slabs (including furnace number, production block number, etc.) is divided according to the principle of "minority obeys majority". For example, among 7 steel billets, 3 are produced from molten steel numbered "01" and 4 are produced from molten steel numbered "02", then the slab name defaults to the molten steel "02".

[0022] The cutting model billet flow module simulates billet flow for single-strand or dual-strand billet production. The billet data generated in step B is combined with the operating signals of the roller drive devices in automatic mode to simulate billet flow. One or two billets are grouped into a slab (for dual-strand billet casters, the principle of grouping two billets into a slab is followed). After the strand is cut, each pusher operation arranges all billets on the cooling bed in stream order to form a slab of one or two slabs, and assigns the simulated heat information to this group of slabs.

[0023] During the steel production process of the Fangwu continuous casting machine in the second zone of the converter, a cutting model is used to calculate the bulk matching information, billet cutting information, and billet assembly information in real time, store them in the database, and send them to the third-level MES system to realize information interaction with each rolling process. At the same time, the billet assembly information and related data are uploaded to the Fangwu spraying machine in real time, so that the Fangwu spraying machine can spray the cutting model information onto the billet for transmission to the next process. When a billet or a plate billet has quality problems during the rolling process, the spray paint information on the billet before rolling is monitored by video, combined with the cutting model historical data query screen to achieve accurate traceability, and comprehensively analyze the abnormal conditions generated during the billet production process by combining production data.

[0024] In the production of the converter three-zone slab seven-double flow slab continuous casting machine, the cutting model is used to track, collect and match the matching information of the cut steel billet in real time, and provide the relevant information of the corresponding molten steel source of the steel billet for the subsequent mixed pouring model. By using the real-time calculation of the length of the steel billet by the cutting model, a certain piece of billet is accurately locked as the steel billet of the mixed pouring furnace molten steel, the accurate locking of the steel billet is realized, and the quality of the steel billet is ensured to be not affected by the mixed pouring, and the steel billet is smoothly output and sent to the next process.

[0025] After using the method, the accuracy of the billet locking is improved from 84% to 97%, directly generating economic benefits of nearly 200,000 yuan per year, solving the problem of low accuracy of steel billet information matching; solving the quality problem of the cast billet, which can be traced and investigated by using accurate data; and strengthening the fine management and control of the quality of the steel billet in each process, which is refined from the previous “furnace management” to “branch management”.

Claims

1. A universal cutting method for a full casting machine, characterized in that: Including control of a full casting machine; The full casting machine includes a pouring device, a cutting device and a billet circulation device arranged in sequence; the pouring device includes a tundish molten steel funnel connected to the outlet of the large ladle molten steel funnel, and the outlet of the fan-shaped section at the lower part of the tundish molten steel funnel is connected to the crystallizer; the cutting device includes a billet straightening machine, a cutting device and a roller table arranged in sequence; the billet circulation device includes a roller table; The control steps include: A. The cutting model pouring module uses the ladle molten steel pouring start signal and the change of the tundish molten steel inventory to calculate. After the ladle starts pouring, the amount of molten steel flowing into the sector of the tundish within a period of time is the sum of the difference in the weight change of the ladle molten steel during the period and the difference in the weight change of the tundish molten steel; the total number of meters of steel drawn from each furnace of molten steel in the continuous casting machine from the beginning to the end of pouring is obtained. The total number of meters of steel drawn is also equal to the length of steel poured. The weight of the steel billet produced in real time in each period of time is the current real time. The product of the difference in the length of the steel being poured and the cross-sectional area of ​​the billet is multiplied by the weight density of the currently poured steel grade. The length of the molten steel in the tundish that will be produced in the sector is equal to the weight of the molten steel in the tundish divided by the cross-sectional area of ​​the billet. The length of the entire furnace of molten steel in the sector is the sum of the length of the molten steel in the tundish that will be produced in the sector and the total number of meters of steel drawn. The total weight of the molten steel in the ladle is the sum of the amount of molten steel in the sector and the weight of the molten steel in the tundish. The total weight of the molten steel in the ladle is also equal to the amount of molten steel required to form the billet in real time in each period of time. B. Cutting Model The cutting module periodically obtains the real-time ingot length and determines the instantaneous value of the pouring length corresponding to the steel head and the billet tail, thereby matching the pouring length range of each furnace of molten steel in the fan-shaped segment obtained in step A, and matching the continuous starting and ending positions of each steel billet with this pouring length range; if the continuous starting and ending positions of the steel billets are in an inclusive relationship, query and assign the corresponding parameter information of the steel billet; if the continuous starting and ending positions of the steel billets are in a non-inclusive relationship, that is, the continuous starting and ending lengths of the steel billets cannot be covered by the pouring length range of a certain furnace of molten steel, then the length of the steel billet is the length between the ending position and the starting position of the steel billet, and then the heat information corresponding to the steel billet is divided and matched according to the starting and ending pouring positions of the steel billet; C. The cutting model billet flow module simulates the billet flow for the multi-stream production of square billets by combining the billet data produced in step B with the operation signals of each roller. Multiple billets are combined into a group of slabs, and the group of slabs is assigned according to the simulated corresponding heat information. If there are two different heat information obtained by simulating the slabs in the group, the group of slabs is assigned the heat information with the larger number of slabs.

2. The universal cutting method for a full casting machine according to claim 1, characterized in that: In step B, the cutting model cutting module uses the first-level real-time point data transmission generated by the infrared camera to periodically obtain the real-time length of the casting blank.

3. The universal cutting method for a full casting machine according to claim 2, characterized in that: In step B, the cutting model cutting module uses the flame cutting signal to determine the instantaneous value of the pouring length corresponding to the steel head and the billet tail.

4. The universal cutting method for a full casting machine according to any one of claims 1 to 3, characterized in that: Step B also includes the case of single-stream or double-stream production of square billets. After the cast strand is cut by the cutting device to produce a slab, the cutting model cutting module automatically matches the corresponding furnace information of the steel billet according to the current starting and ending positions of the slab and the historical pouring length of each furnace of molten steel.

5. The universal cutting method for a full casting machine according to any one of claims 1 to 3, characterized in that: Step C also includes: the cutting model billet flow module simulates the billet flow for the billet data produced in step B in combination with the operation signals of each roller for single-stream or double-stream production of square billets, and assigns the group of slabs according to the simulated corresponding heat information.

6. The universal cutting method for a full casting machine according to claim 4, characterized in that: Step C also includes: the cutting model billet flow module simulates the billet flow for the billet data produced in step B in combination with the operation signals of each roller for single-stream or double-stream production of square billets, and assigns the group of slabs according to the simulated corresponding heat information.

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