Optimization treatment method after rolling of broken strip by reversible rolling mill

Abstract

The invention discloses an optimization treatment method for a broken strip rolled by a reversible rolling mill, relates to the technical field of metal plate rolling, and aims to solve the problems that the production efficiency is low and the rolling cost is high due to the fact that the broken strip is treated only by relying on coil-dividing tonnage or pass parity in the prior art. The method comprises the following steps: confirming that a working roll is not damaged by strip breakage of the twenty-high roll mill; judging whether the A-side and B-side sub-rolls have rolling ability or not, and rolling the side sub-rolls when only one side is feasible; when the A-side and B-side sub-coils can be rolled, processing according to tonnage difference coefficients, if the coefficients exceed a threshold value, selecting a preferential rolling side according to the odd-even of the total pass, and checking the comprehensive cost of coil unloading and non-coil unloading of the non-preferential side to be in a definite state; the original rolling speed is kept after belt breakage, and a sleeve is not arranged in a finished product pass. The method is suitable for multiple types of reversible rolling mills and multiple steel types, reduces the raw material and time cost, improves the efficiency, and is suitable for high-cost steel type rolling and debugging scenes.

Description

Technical Field

[0001] This invention relates to the field of sheet metal rolling technology, and in particular to an optimized treatment method for strip breakage after reversible rolling mill. Background Technology

[0002] In the field of sheet metal rolling, 20-roll reversible rolling mills are widely used in the production of thin strips and other products due to their high-precision rolling capabilities. However, strip breakage accidents occur frequently during actual production and new product commissioning. Strip breakage not only interrupts the production process but can also lead to waste of raw materials and equipment damage. Therefore, adopting effective rolling strategies after strip breakage to save energy, improve production efficiency, reduce rolling costs, and maximize economic benefits has become a critical need that the industry urgently needs to address.

[0003] To mitigate the adverse effects of strip breakage during rolling, the industry has explored various post-processing methods. Among them, patent CN116351879A discloses a method for handling strip breakage on a single-stand reversible rolling mill. This method first determines the rollability of the two coils after the strip breaks, and then differentiates rolling based on the odd or even number of remaining rolling passes. However, practice has shown that this method has significant shortcomings in practical applications. Its logic for differentiating rolling processes leads to poor production flow continuity, ultimately resulting in low production efficiency and high rolling costs, making it difficult to meet the economic requirements of large-scale production.

[0004] In addition to the aforementioned patented technologies, on-site production workers also commonly employ a strip breakage handling method based on rolling tonnage: after a strip breakage occurs, the rollability of the strip is first assessed to determine whether rolling should continue, and then a specific operational choice is made based on the rolling tonnage. If the coil on the finished side of the strip in the breakage pass is lighter, the finished side is uncoiled, and rolling continues on the unrolled side; if the finished side is heavier, the unfinished side is uncoiled, and the next rolling pass begins. While this method is widely used in most actual production processes due to its simplicity, it has a core flaw: it relies solely on tonnage for judgment, failing to comprehensively consider the time and raw material costs during the rolling process. This easily leads to redundant rolling processes, energy waste, and also results in low rolling efficiency and high rolling costs.

[0005] In summary, existing technologies for handling strip breakage in 20-roll reversible rolling mills either suffer from flawed logic in distinguishing between odd and even passes, or rely solely on tonnage judgment while ignoring multi-dimensional cost factors. Consequently, neither can achieve the goal of efficient and low-cost rolling after strip breakage. Therefore, developing a technical method capable of rapidly identifying and accurately assessing the operating condition after strip breakage, and formulating an optimal handling solution based on comprehensive rolling costs, has become an urgent need in the industry. Summary of the Invention

[0006] Therefore, the technical problem to be solved by this invention is to overcome the limitations of existing technologies that rely solely on the tonnage of the rolls to determine the rolling sequence or handle the remaining strip passes based on their odd or evenness, resulting in low production efficiency and high rolling costs. Furthermore, the invention lacks a refined decision-making method that combines rolling time costs and raw material costs, thus failing to maximize economic benefits after strip breakage. Therefore, this invention provides an optimized treatment method for strip breakage after reversible rolling mill operation, comprising the following steps: It was confirmed that the strip breakage in the 20-roll mill did not cause damage to the work rolls, and therefore no roll replacement operation was required. Determine whether the A-side coil and B-side coil formed by the interrupted strip during rolling are rollable: When the judgment result is that only the A-side coil is rollable, the strip head of the A-side coil is threaded, the coil is wound and tensioned, and the machine is started to produce the finished steel coil. When the judgment result is that only the B-side coil is rollable, the strip head of the B-side coil is threaded, the coil is wound and tensioned, and the machine is started to produce the finished steel coil. When the judgment result indicates that both the A-side coil and the B-side coil are rollable, the quality of the A-side coil is considered. and the quality of the B-side split roll Set a threshold for judging quality differences. Calculate the tonnage difference coefficient between the two rolls. The results of the coefficients are handled in two ways: If satisfied Then, one coil can be selected for threading and rolling, while the other coil is unwound; after the first coil is rolled, the unwound coil is re-wound, threaded, and rolled to obtain the second finished steel coil. If satisfied Based on the parity of the total production passes n, the priority rolling section is selected, and the comprehensive cost accounting of unwinding and not unwinding the other side section is performed. The unwinding status of the other side section is determined based on the accounting results. After the priority rolling section is completed, the other side section is re-wound, threaded, and rolled after being tensioned to obtain two finished steel coils. When using the non-unwinding rolling method, the tightly rolled strip on the other side is transferred to the subsequent annealing process along with the corresponding finished steel coil and cut off before annealing to ensure that the strip entering the annealing process meets the process requirements.

[0007] In one embodiment of the present invention, the method for calculating the combined cost of unwinding and not unwinding the other side of the roll is as follows: Calculate the overall cost of performing non-unwinding on the other side of the roll. : , This refers to the raw material costs incurred during non-unwinding operations; To avoid the cost of reduced hourly steel production due to strip breakage during uncoiling operations; At the same time, calculate the overall cost of unwinding the other side of the roll. : , The cost incurred due to strip breakage during uncoiling operations affecting hourly steel production per ton. This refers to the cost of raw materials incurred during the unwinding operation.

[0008] In one embodiment of the present invention, the raw material cost generated during the non-unwinding operation The calculation method is as follows: Based on raw material density , raw material width and the thickness of the broken strip Calculate the mass of the new raw materials : , To prioritize the length of the non-priority side winding of the roll-out, To prioritize the rolling of the sub-coils around the length of their own winding machine, This refers to the number of times the belt was broken. Based on the quality of the newly added raw materials Calculate the raw material costs incurred during non-unwinding operations. : , This represents the unit cost of raw materials.

[0009] In one embodiment of the invention, the length of the priority rolling spool winding non-priority side take-up machine The calculation method is as follows: ,in The diameter of the winding machine, The outer diameter of the non-priority side steel coil after being wound n turns. Number of turns This refers to the strip thickness for the next pass after the strip breaks. This is the fixed number of turns coefficient for tensioning and building up the tension.

[0010] In one embodiment of the present invention, the method for obtaining the number of winding turns n is as follows: Formula for calculating the mass of a steel coil Formula for total winding length The system of equations is solved to obtain the number of turns n. in, For the quality of steel coils, For the volume of the steel coil, , For the width of the raw material, For the thickness of the steel coil, This represents the total length of the unfolded steel coil.

[0011] In one embodiment of the invention, the length of the priority rolling sub-winding self-winding machine is... The calculation method is as follows: ,in The diameter of the winding machine, This is the fixed number of turns coefficient for tensioning and building up the tension.

[0012] In one embodiment of the present invention, the cost incurred by the loss of steel per ton per hour due to strip breakage during the non-uncoiling operation is described. The calculation method is as follows: Calculate the actual hourly output per ton of steel after the strip breakage. : ,in The normal hourly output per ton of steel is represented by t, which is the total duration of the strip breakage. Based on the actual hourly output per ton of steel after the breakage. Calculate production loss : ; According to the aforementioned production loss Calculate the unit output loss cost Y: , Unit rolling cost; Based on the unit output loss cost Y, calculate the cost of the impact of strip breakage on the hourly output per ton of steel during non-uncoiling operations. : , This refers to the total mass of raw materials added before the belt breaks.

[0013] In one embodiment of the present invention, if the following conditions are met... Then, one coil is randomly selected for threading and rolling, while the other coil is unwound; after the first coil is rolled, the unwound coil is re-wound, threaded, and rolled to obtain the second finished steel coil. The method is as follows: If you choose to roll the A-side coil first, control the mandrel corresponding to the A-side coil to unwind and thread the strip, and at the same time control the mandrel corresponding to the B-side coil to perform the unwinding operation; after the A-side coil is rolled and unwound, rewind the B-side coil onto the mandrel, control the strip head of the B-side coil to thread and wind up the tension, and then start rolling. If you choose to roll the B-side coil first, control the mandrel corresponding to the B-side coil to unwind and thread the strip, and at the same time control the mandrel corresponding to the A-side coil to perform the unwinding operation; after the B-side coil is rolled and unwound, rewind the A-side coil onto the mandrel, control the A-side coil strip head to thread and wind up the tension, and then start rolling.

[0014] In one embodiment of the present invention, the method for determining whether the A-side coil and B-side coil formed by the rolling interruption strip are rollable is as follows: The mass of any side of the coil is compared with the set minimum rollable tonnage. If the mass of any side of the coil is greater than or equal to the minimum rollable tonnage, then the side of the coil is determined to be rollable.

[0015] In one embodiment of the present invention, the method further includes: After a strip breakage occurs in a 20-roll mill, the rolling speed of subsequent passes remains at the original settings before the strip breakage. The rolling process for finished products does not require the use of an upper sleeve.

[0016] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: This invention not only has a wide range of applications (covering single-stand reversible rolling mills such as 20-roll, 6-roll, and 18-roll mills, adaptable to various steel grades including medium- and high-grade non-oriented silicon steel, oriented silicon steel, high-strength steel, and stainless steel, without distinguishing between the parity of the strip passes, rolling thickness, and width, and without requiring a sleeve for the finished product passes), but also possesses refined decision-making logic and cost advantages: first, the rollability of the two coils is determined by the minimum rollable tonnage; then, the tonnage situation is distinguished by the standard that the absolute value of the difference in tonnage between the two sides does not exceed the preset proportion of either side; simultaneously, the priority rolling order of the A / B sides is determined based on the parity of the total production passes; and finally, the cost is determined by quantifying the impact of raw material losses (Q1, Q2) and hourly output per ton of steel (Y1). By comparing the overall cost of not uncoiling and uncoiling (Y2), the optimal solution is selected, which avoids the blindness of simply judging by tonnage and reduces the problems of wasted time in uncoiling or wasted raw materials in not uncoiling. Moreover, when the strip breakage does not damage the work rolls, there is no need to change the rolls and maintain the original pass speed. The strip steel wound in during the non-uncoiling process can also be removed by subsequent annealing, further reducing raw material loss. At the same time, it can form an intelligent program to quickly respond to strip breakage handling, improve operational efficiency, and effectively reduce economic losses after strip breakage. It is especially suitable for rolling high-cost steel grades such as non-oriented silicon steel and rolling debugging, and scenarios with known strip breakage risks. It increases the trial and error capability while reducing economic risks, and achieves dual optimization of production efficiency and economic benefits. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic flowchart of an optimized treatment method for strip breakage after reversible rolling mill provided in an embodiment of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0020] This invention provides an optimized treatment method for strip breakage after rolling in a reversible rolling mill. This method is applicable to single-stand reversible rolling mills such as 20-roll, 6-roll, and 18-roll mills, and can be adapted to various steel grades such as medium and high grade non-oriented silicon steel, oriented silicon steel, high-strength steel, and stainless steel. It does not distinguish between the odd and evenness of the strip breakage pass, or the rolling thickness and width. It can quickly formulate the optimal rolling strategy after strip breakage, achieving dual optimization of production efficiency and economic benefits.

[0021] After a strip breakage occurs in a 20-roll mill, the first step is to perform a preliminary confirmation: check whether the strip breakage has damaged the work rolls. If there is no damage, there is no need to perform a roll replacement operation and proceed directly to the subsequent processing procedure; if there is damage, the roll replacement must be completed first before proceeding with this method.

[0022] Meanwhile, the basic parameters required to obtain the method proposed in this embodiment include, but are not limited to: the total mass of raw materials input before tape breakage. (Unit: tons), Raw material width (Unit: mm) Thickness of broken strip pass ( (Number of tape breaks, unit: mm) and thickness of the next tape break. (Unit: mm) Raw material density (The normal value is) Unit cost of raw materials (Unit: Yuan / Ton), Coiler Diameter (Unit: mm) Fixed number of turns coefficient for tensioning (Standard value is 4 turns, used for tension rolling tension setting), normal hourly output per ton of steel. (Unit: tons / hour), Unit rolling cost (Unit: Yuan / Ton), Threading Time (Standard time for a single roll is 10 minutes), roll loading time (Standard value is 5 minutes), unwinding time (Standard value 5min), and the quality of the A-side splitting. (Unit: tons) B-side roll weight (Unit: tons)

[0023] In the case where the belt breakage does not cause damage to the work roll, refer to Figure 1 As shown, the core process of this method consists of four key steps: rollability assessment, tonnage difference handling, selection of preferred rolling side, and comprehensive cost accounting, as detailed below: Step 1: Determine the rollability of the A and B side rolls. After the strip breaks, A-side coils and B-side coils are formed (the positions of sides A and B are fixed and do not change in any pass). The rollability of the A-side coils and B-side coils formed by the strip break is determined by comparing the quality of the coils with the set minimum rollable tonnage. If the mass of any side of the roll is greater than or equal to the minimum rollable tonnage (set to 5 tons in this embodiment), then the roll on that side is determined to be rollable; if the mass of the roll is less than 5 tons, then it is determined to be not rollable.

[0024] Based on the rollability assessment results, three scenarios are considered: When the judgment result is that only the A-side coil is rollable, the strip head of the A-side coil is threaded, the coil is wound and tensioned, and the machine is started to produce the finished steel coil. When the judgment result is that only the B-side coil is rollable, the strip head of the B-side coil is threaded, the coil is wound and tensioned, and the machine is started to produce the finished steel coil. When the judgment result is that both the A-side coil and the B-side coil are rollable, proceed to step 2 for further processing based on the tonnage difference between the two sides of the coil.

[0025] Step 2: Grading based on tonnage differences Set a threshold for judging quality differences. (In this embodiment) (That is, the absolute value of the difference in tonnage between the two sides does not exceed 5% of the tonnage on either side), calculate the tonnage difference coefficient between the two rolls: The results of the coefficients are handled in two ways: If satisfied If the tonnage of the two coils is equal or approximately equal, then one coil (either side A or side B) can be selected for threading and rolling, while the other coil is unloaded. After the first coil is rolled and unloaded, the unloaded coil is re-wound onto the mandrel, its lead thread is controlled and the coil is wound up and tensioned, and the rolling is started according to the original parameters to finally obtain two finished steel coils. For example, if you choose to roll the A-side coil first, control the mandrel corresponding to the A-side coil to unwind and thread the strip, while simultaneously controlling the mandrel corresponding to the B-side coil to unwind; after the A-side coil is rolled and unwound, rewind the B-side coil onto the mandrel, control the strip head of the B-side coil to thread and wind up the tension, and then start rolling; if you choose to roll the B-side coil first, control the mandrel corresponding to the B-side coil to unwind and thread the strip, while simultaneously controlling the mandrel corresponding to the A-side coil to unwind; after the B-side coil is rolled and unwound, rewind the A-side coil onto the mandrel, control the strip head of the A-side coil to thread and wind up the tension, and then start rolling.

[0026] If satisfied This indicates that the tonnage of the two windings is unequal and the difference is significant. Therefore, based on the total number of production passes... Based on the parity of the coils, the preferred rolling section is selected. Simultaneously, a comprehensive cost calculation is performed on the other side's coils, considering both unwinding and not unwinding. The unwinding status of that side's coils is determined based on the calculation results, as follows: When the total number of production stages When the number of turns is odd, roll the A-side coil first; when the total number of production passes is odd... When the number is even, roll the B-side coil first; Simultaneously perform step 3 to calculate the comprehensive unwinding cost of the non-priority rolling side coiling. Comprehensive cost of not unloading the roll Choose the lower-cost option to implement; After the priority rolling coils are rolled, the non-priority rolling coils (if previously unloaded, are re-coiled) are threaded, tensioned, and rolled to finally obtain two finished steel coils. When using the non-unwinding rolling method, the coiled strip steel on the non-priority side is transferred to the subsequent annealing process along with the corresponding finished steel coil. It is then cut off before annealing to ensure that the strip steel entering the annealing process meets the process requirements.

[0027] Step 3: Comprehensive Cost Accounting Method Specifically, the core of comprehensive cost accounting is to quantify the impact of raw material costs and hourly output per ton of steel on costs. Therefore, the method for comprehensive cost accounting for the other side of the coil, whether or not to uncoil, is as follows: Calculate the overall cost of performing non-unwinding on the other side of the roll. : , The raw material cost incurred during non-unwinding operations is expressed in yuan. The cost per ton of steel per hour is calculated in yuan, representing the cost incurred due to strip breakage during uncoiling operations that affects hourly steel production. Among them, the raw material cost generated during the non-unwinding operation The calculation method is as follows: Based on raw material density , raw material width and the thickness of the broken strip Calculate the mass of the new raw materials (Extra strip mass consumed when not uncoiling, unit: tons): , in, The number of times the belt was broken. The length (in mm) of the non-priority side winding machine for priority rolling is calculated using the following formula: ,in =510mm is the diameter of the winding machine. This represents the outer diameter of the non-priority side steel coil after being wound n turns, where n is the number of turns. This refers to the strip thickness for the next pass after the strip breaks. In this embodiment, the fixed number of turns for tensioning is set to 4; The formula for calculating the length (in mm) of the pre-rolled sub-coil winding itself is as follows: ,in =510mm is the fixed diameter parameter of the winding machine; Based on the quality of the newly added raw materials Calculate the raw material costs incurred during non-unwinding operations. : , The unit cost of raw materials is expressed in yuan per ton.

[0028] Furthermore, the method for obtaining the number of winding turns n is as follows: Formula for calculating the mass of a steel coil Formula for total winding length The system of equations is solved to obtain the number of turns n. in, For the quality of steel coils, For the volume of the steel coil, , For the width of the raw material, For the thickness of the steel coil, This represents the total length of the unfolded steel coil.

[0029] Furthermore, the cost incurred by the loss of one ton of steel per hour due to strip breakage during the non-uncoiling operation. The calculation method is as follows: Calculate the actual hourly output per ton of steel after the strip breakage. (Unit: tons / hour): ,in The normal hourly output of steel is ton / hour, and t is the total duration of the strip breakage. Based on the actual hourly output per ton of steel after the breakage. Calculate production loss : ; According to the aforementioned production loss Calculate the unit output loss cost Y: , Unit rolling cost; Based on the unit output loss cost Y, calculate the cost of the impact of strip breakage on the hourly output per ton of steel during non-uncoiling operations. : , This refers to the total mass of raw materials added before the belt breaks.

[0030] At the same time, calculate the overall cost of unwinding the other side of the roll. : , The calculation logic is the same as the raw material cost incurred during the unwinding operation. Consistent, only need to be adjusted according to the actual winding length at the time of unwinding. , For example, when unwinding, the priority side rewinding only wraps around its own winding machine, without wrapping around the non-priority side; The calculation logic is as follows: This includes the cost incurred by strip breakage during uncoiling operations affecting hourly steel production per ton. The process is consistent; only the time (t) needs to be adjusted based on the total time spent unwinding the roll (including unwinding, rewinding, and threading).

[0031] like For non-priority side rolls, the unrolling method is used; if If the values ​​are equal, then unload the non-priority volume; if the values ​​are equal, then either method can be chosen for the non-priority volume.

[0032] Furthermore, in this embodiment, the method further includes: After a strip breakage occurs in a 20-roll mill, the rolling speed of subsequent passes remains at the original settings before the strip breakage, without the need to reduce the speed, thus ensuring production efficiency. The rolling process eliminates the need for the upper sleeve operation, simplifying the process and reducing auxiliary time.

[0033] The effectiveness of this method is verified through two examples below. The total number of production passes in these examples is... (Odd number, priority rolling on side A), track breakage sequence (Third fault zone), other basic parameters are uniformly set as follows: Winding machine diameter The coefficient of the fixed number of turns for tensioning ; Raw material width Raw material density Total mass of raw materials Tons; thickness of broken strip The thickness of the next pass after the band breaks Unit cost of raw materials Yuan / ton, unit rolling cost Yuan / ton, normal hourly output per ton of steel tons / hour; conveyor belt threading time min / volume, first volume time min / roll, unwinding time min / volume.

[0034] Example 1: Side A (thin coil) weight = 5 tons, Side B (thick coil) weight = 15 tons

[0035] 1. Rollability and Preferred Side Determination Both sides A and B have a mass ≥ 5 tons and are rollable; the tonnage difference coefficient between the two sides is... If the total number of passes n=5 is an odd number, roll side A first, and calculate the cost of unwinding and not unwinding side B.

[0036] 2. Calculate the cost of unloading the roll.

[0037] Given formula 1 (volume V = width b × thickness h × length l) and formula 2 (weight m = density ρ × volume V), and the mass of the B-side coil is known, calculate the total length of the strip steel in the B-side coil. : ; From the winding length formula (l=π×[d×n+n(n+1)×h]), we can solve the equation to get n≈312 turns.

[0038] Calculate the outer diameter D of the B-side thick roll: D=510+2×312×1.610≈510+1001.04=1511.04mm; Calculate the length of the thick roll around side B. : ; Calculate its own length around side A : ; Calculate the mass of the new raw materials : ; Calculate the raw material costs incurred during non-unwinding operations. : Yuan.

[0039] Calculate the cost of strip breakage affecting hourly output per ton of steel during non-uncoiling operations. : Due to the impact of strip breakage during rolling, it is necessary to calculate the strip threading time for side A, the strip unwinding time for side A, the strip threading time for side B, and the strip unwinding time for side B. The time for two strip threading operations is calculated. =2 * 10 = 20 minutes, the time for two unloading operations =2*5=10min, therefore the total duration t of the band breakage effect used above is 30min.

[0040] Actual hourly output per ton of steel tons / hour, production loss =4 tons / hour; unit output loss cost Yuan / ton; Calculate the cost of strip breakage affecting hourly output per ton of steel during non-uncoiling operations. Yuan; Yuan.

[0041] 2. Calculate the cost of unloading the coil on side B.

[0042] When unwinding, side A only winds around its own winding machine, and the mass of the additional raw material is calculated. : ton; Raw material costs incurred during unwinding operations : Yuan; Total duration of belt breakage : min; Actual hourly output per ton of steel tons / hour, production loss =4.42 tons / hour; unit output loss cost Yuan / ton; Calculate the cost of the impact of strip breakage on hourly output per ton of steel during uncoiling operations. Yuan; Yuan.

[0043] because Select to perform unwinding operation on side B, prioritize rolling side A, and rewind side B after side A is completed.

[0044] Example 2: Side A (thin coil) weight = 15 tons, Side B (thick coil) weight = 5 tons

[0045] 1. Rollability and Preferred Side Determination

[0046] Both sides A and B have a mass ≥ 5 tons and are rollable; the tonnage difference coefficient between the two sides is... If the total number of passes n=5 is an odd number, roll side A first, and calculate the cost of unwinding and not unwinding side B.

[0047] Calculate the total length of the strip coiled on side B. : From the winding length formula (l=π×[d×n+n(n+1)×h]), we can solve the equation to get n≈178 turns.

[0048] Calculate the outer diameter D of the B-side thick roll:

[0049] D=510+2×178×1.610≈510+574.76=1084.76mm; ; Consistent with Example 1; Calculate the mass of the new raw materials : ; Calculate the raw material costs incurred during non-unwinding operations. : Yuan; Additional time is the same as in Example 1, actual hourly output per ton of steel. The output is approximately 8 tons / hour, resulting in an increase of 96.7 yuan / ton in cost per ton. Calculate the cost of the impact of strip breakage on hourly steel production when the coil is not unloaded. =96.7×20=1934 yuan.

[0050] Yuan. Same as Example 1, still Yuan. Due to Therefore, the option of not unloading the roll was chosen.

[0051] Based on the aforementioned optimized treatment method for strip breakage after reversible rolling mill, this invention also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements any of the aforementioned optimized treatment methods for strip breakage after reversible rolling mill, including work roll damage confirmation, rollability judgment, tonnage difference calculation, priority side selection, comprehensive cost accounting, rolling parameter control, etc., thereby realizing intelligent and automated strip breakage treatment.

[0052] In summary, this method, through a three-tiered logic of "rollability judgment - tonnage classification - cost quantification," overcomes the limitations of existing technologies that rely solely on tonnage or the parity of the test run, and possesses the following advantages: Firstly, it has a wide range of applications: it is compatible with various types of single-stand reversible rolling mills and various steel grades, without distinguishing between strip breaks and specifications; Secondly, cost management: simultaneously consider raw material loss and time costs to avoid waste caused by blindly unloading or not unloading the rolls; Third, efficiency optimization: No need to change rolls after strip breakage (when the work rolls are not damaged), maintain the original rolling speed, and do not use the sleeve for finished product passes, reducing auxiliary time; Fourth, the risks are controllable: it is suitable for rolling debugging and high strip breakage risk scenarios, increasing the trial and error while reducing economic losses, and is especially suitable for high-cost steel grades such as non-oriented silicon steel.

[0053] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0054] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0055] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0056] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An optimized treatment method for strip breakage after reversible rolling mill, characterized in that, include: It was confirmed that the strip breakage in the 20-roll mill did not cause damage to the work rolls, and therefore no roll replacement operation was required. Determine whether the A-side coil and B-side coil formed by the interrupted strip during rolling are rollable: When the judgment result is that only the A-side coil is rollable, the strip head of the A-side coil is threaded, the coil is wound and tensioned, and the machine is started to produce the finished steel coil. When the judgment result is that only the B-side coil is rollable, the strip head of the B-side coil is threaded, the coil is wound and tensioned, and the machine is started to produce the finished steel coil. When the judgment result indicates that both the A-side coil and the B-side coil are rollable, the quality of the A-side coil is considered. and the quality of the B-side split roll Set a threshold for judging quality differences. Calculate the tonnage difference coefficient between the two rolls. The results of the coefficients are handled in two ways: If satisfied Then, one coil can be selected for threading and rolling, while the other coil is unwound; after the first coil is rolled, the unwound coil is re-wound, threaded, and rolled to obtain the second finished steel coil. If satisfied Based on the parity of the total production passes n, the priority rolling section is selected, and the comprehensive cost accounting of unwinding and not unwinding the other section is performed. The unwinding status of the section on that side is determined based on the accounting results. After the priority rolling coil is completed, the other side coil is re-coiled, threaded, and rolled to obtain two finished steel coils. When using the non-unwinding rolling method, the tightly rolled strip on the other side is transferred to the subsequent annealing process along with the corresponding finished steel coil and cut off before annealing to ensure that the strip entering the annealing process meets the process requirements.

2. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 1, characterized in that, The method for calculating the combined cost of unwinding and not unwinding the roll on the other side is as follows: Calculate the overall cost of performing non-unwinding on the other side of the roll. : , This refers to the raw material costs incurred during non-unwinding operations; To avoid the cost of reduced hourly steel production due to strip breakage during uncoiling operations; At the same time, calculate the overall cost of unwinding the other side of the roll. : , The cost incurred due to strip breakage during uncoiling operations affecting hourly steel production per ton. This refers to the cost of raw materials incurred during the unwinding operation.

3. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 2, characterized in that, The raw material costs incurred during the non-unwinding operation The calculation method is as follows: Based on raw material density , raw material width and the thickness of the broken strip Calculate the quality of the new raw materials : , To prioritize the length of the non-priority side winding of the roll-out, To prioritize the rolling of the sub-coils around the length of their own winding machine, This refers to the number of times the belt was broken. Based on the quality of the newly added raw materials Calculate the raw material costs incurred during non-unwinding operations. : , This represents the unit cost of raw materials.

4. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 3, characterized in that, The length of the priority rolling slitting non-priority side coiler The calculation method is as follows: ,in The diameter of the winding machine, The outer diameter of the non-priority side steel coil after being wound n turns, where n is the number of turns. This refers to the strip thickness for the next pass after the strip breaks. This is the fixed number of turns coefficient for tensioning and building up the tension.

5. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 4, characterized in that, The method for obtaining the number of winding turns n is as follows: Formula for calculating the mass of a steel coil Formula for total winding length The system of equations is solved to obtain the number of turns n. in, For the quality of steel coils, For the volume of the steel coil, , For the width of the raw material, For the thickness of the steel coil, This represents the total length of the unfolded steel coil.

6. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 3, characterized in that, The length of the priority rolling spool winding itself is... The calculation method is as follows: ,in The diameter of the winding machine, This is the fixed number of turns coefficient for tensioning and building up the tension.

7. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 2, characterized in that, The cost incurred by the impact of strip breakage on hourly steel production during the non-uncoiling operation is mentioned. The calculation method is as follows: Calculate the actual hourly output per ton of steel after the strip breakage. : ,in The normal hourly output per ton of steel is represented by t, which is the total duration of the strip breakage. Based on the actual hourly output per ton of steel after the breakage. Calculate production loss : ; According to the aforementioned production loss Calculate the unit output loss cost Y: , Unit rolling cost; Based on the unit output loss cost Y, calculate the cost of the impact of strip breakage on the hourly output per ton of steel during non-uncoiling operations. : , This refers to the total mass of raw materials added before the belt breaks.

8. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 1, characterized in that, If satisfied Then, one coil can be randomly selected for threading and rolling, while the other coil is unwound; after the first coil is rolled, the unwound coil is re-wound, threaded, and rolled to obtain the second finished steel coil. The method is as follows: If you choose to roll the A-side coil first, control the mandrel corresponding to the A-side coil to unwind and thread the strip, and at the same time control the mandrel corresponding to the B-side coil to perform the unwinding operation; after the A-side coil is rolled and unwound, rewind the B-side coil onto the mandrel, control the strip head of the B-side coil to thread and wind up the tension, and then start rolling. If you choose to roll the B-side coil first, control the mandrel corresponding to the B-side coil to unwind and thread the strip, and at the same time control the mandrel corresponding to the A-side coil to perform the unwinding operation; after the B-side coil is rolled and unwound, rewind the A-side coil onto the mandrel, control the A-side coil strip head to thread and wind up the tension, and then start rolling.

9. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 1, characterized in that, The method for determining whether the A-side and B-side coils formed by the rolling break are rollable is as follows: The mass of any side of the coil is compared with the set minimum rollable tonnage. If the mass of any side of the coil is greater than or equal to the minimum rollable tonnage, then the side of the coil is determined to be rollable.

10. The optimized treatment method for strip breakage after reversible rolling mill as described in claim 1, characterized in that, The method further includes: After a strip breakage occurs in a 20-roll mill, the rolling speed of subsequent passes remains at the original settings before the strip breakage. The rolling process for finished products does not require the use of an upper sleeve.

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