Rolling method, device, equipment and system for ultra-thin gauge plate

Abstract

The invention discloses a rolling method, device, equipment and system for an ultra-thin gauge plate. The method comprises the following steps of: before rolling the ultra-thin specification plate, replacing a rough rolling supporting roll and a finish rolling supporting roll with supporting rolls with flat roll types and corresponding target tonnages, and replacing a rough rolling working roll and a finish rolling working roll with working rolls with corresponding roll types and target roll diameters, the roll types of the first working roll and the second working roll are negative convexity roll types with first convexity, the roll types of the third working roll and the fourth working roll are CVC roll types, the roll type of the fifth working roll is negative convexity roll types with second convexity, and the roll types of the sixth working roll and the seventh working roll are negative convexity single-side conical roll types with third convexity; the roller type of the eighth working roller is the negative convexity roller type of the fourth convexity, and the target tonnage is smaller than the preset maximum tonnage; and after replacement, the roughing mill and the finishing mill are controlled to roll the plate blank, so that the ultra-thin specification plate with the good plate shape is obtained.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical technology, and in particular to a rolling method, device, equipment and system for extreme thin-gauge plates. Background Art

[0002] Extremely thin plate refers to a steel plate with a thickness far below the standard of traditional steel plates, and the thickness is generally below 0.83mm. Its production technology and product quality represent the top level of the steel industry. The rolling process of extremely thin plate is very complicated and has extremely high technical difficulty. It needs to go through multiple processes such as uncoiling, threading, pressing, rolling, and recoiling. Since the thickness of these plates is far lower than that of ordinary steel plates, brittle fracture is very likely to occur during the rolling process. Therefore, there are extremely high requirements for mill precision control, operating skills, roll assembly preparation, and process system.

[0003] In the related art, the alignment of each frame is scanned and observed during the rolling process. If a frame deviates, only this frame is leveled to ensure that the plate shape quality meets the requirements.

[0004] However, when the above method is used for rolling, the strip is prone to double-sided corrugated plate defects, and may even lead to steel breakage and pile-up accidents. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a method, device, equipment and system for rolling extremely thin-gauge plates that solve the above problems, select supporting rolls with suitable tonnage and roll type for the roughing mill and the finishing mill, and select working rolls with suitable roll type and roll diameter for the roughing mill and the finishing mill, so as to roll extremely thin-gauge plates with better plate shape and reduce the occurrence of steel breakage and pile-up accidents.

[0006] In a first aspect, the present invention provides a method for rolling an extremely thin gauge plate, the method comprising: using a roughing mill and a finishing mill during rolling, the roughing mill comprising a roughing support roll and a roughing working roll, the finishing mill comprising a finishing support roll and a finishing working roll, the roughing working rolls comprising a first working roll, a second working roll and a third working roll in sequence according to the running direction of the slab, the finishing working rolls comprising a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll in sequence according to the running direction of the slab, the method comprising:

[0007] Before rolling the extreme thin gauge plate, the rough rolling support roll and the finishing support roll are both replaced with flat rolls and support rolls with corresponding target tonnage, and the rough rolling work roll and the finishing work roll are both replaced with work rolls with corresponding roll shapes and target roll diameters, wherein the roll shapes of the first work roll and the second work roll are negative convex roll shapes of the first convexity, the roll shapes of the third work roll and the fourth work roll are CVC roll shapes, the roll shape of the fifth work roll is negative convex roll shapes of the second convexity, the roll shape of the sixth work roll and the seventh work roll is negative convex single-sided tapered roll shape of the third convexity, the roll shape of the eighth work roll is negative convex roll shape of the fourth convexity, and the target tonnage is less than the preset maximum tonnage;

[0008] After replacing the roughing support roll, the roughing working roll, the finishing support roll and the finishing working roll, the roughing mill and the finishing mill are controlled to roll the slab to obtain the extreme thin gauge plate.

[0009] Optionally, the rough rolling support rollers include a first support roller, a second support roller and a third support roller in sequence according to the running direction of the slab, and the target tonnages corresponding to the first support roller, the second support roller and the third support roller decrease in sequence.

[0010] Optionally, the maximum tonnage of the first support roller, the second support roller and the third support roller is 140,000 tons.

[0011] Optionally, the finishing rolling support rollers include a fourth support roller, a fifth support roller, a sixth support roller, a seventh support roller and an eighth support roller in sequence according to the running direction of the slab, and the maximum tonnages corresponding to the fourth support roller, the fifth support roller, the sixth support roller, the seventh support roller and the eighth support roller are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons respectively.

[0012] Optionally, the absolute values ​​of the first convexity, the second convexity, the third convexity and the fourth convexity decrease successively.

[0013] Optionally, the first convexity is -0.95 mm, the second convexity is -0.26 mm, the third convexity is -0.18 mm, and the fourth convexity is -0.08 mm.

[0014] Optionally, the target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are in the range of 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm respectively.

[0015] In a second aspect, the present invention provides a rolling device for extremely thin gauge plates, wherein a roughing mill and a finishing mill are used during rolling, wherein the roughing mill comprises a roughing support roll and a roughing working roll, wherein the finishing mill comprises a finishing support roll and a finishing working roll, wherein the roughing working roll comprises a first working roll, a second working roll and a third working roll, wherein the finishing working roll comprises a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll, wherein the device comprises:

[0016] A replacement module is used for replacing the roughing support roll and the finishing support roll with flat rolls and support rolls with corresponding target tonnages before rolling the extreme thin gauge plate, and replacing the roughing work roll and the finishing work roll with work rolls with corresponding roll shapes and target roll diameters, wherein the roll shapes of the first work roll and the second work roll are negative convex roll shapes of the first convexity, the roll shapes of the third work roll and the fourth work roll are CVC roll shapes, the roll shape of the fifth work roll is negative convex roll shapes of the second convexity, the roll shape of the sixth work roll and the seventh work roll is negative convex single-sided tapered roll shape of the third convexity, the roll shape of the eighth work roll is negative convex roll shape of the fourth convexity, and the target tonnage is less than the preset maximum tonnage;

[0017] A control module is used to control the roughing mill and the finishing mill to roll the slab to obtain the extreme thin gauge plate after replacing the roughing support roll, the roughing working roll, the finishing support roll and the finishing working roll.

[0018] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0019] In a fourth aspect, the present invention provides a rolling system for an extreme thin gauge plate, the rolling system comprising a roughing mill and a finishing mill, the roughing mill comprising a roughing support roll and a roughing working roll, the finishing mill comprising a finishing support roll and a finishing working roll, the roughing working rolls comprising a first working roll, a second working roll and a third working roll in sequence according to the running direction of the slab, the finishing working rolls comprising a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll in sequence according to the running direction of the slab;

[0020] The roughing support roll and the finishing support roll are both flat rolls and have a tonnage corresponding to a target tonnage, and the roughing work roll and the finishing work roll are both flat rolls and have a tonnage corresponding to a target tonnage;

[0021] Among them, the roll shape of the first working roll and the second working roll is a negative crown roll shape of the first crown, the roll shape of the third working roll and the fourth working roll is a CVC roll shape, the roll shape of the fifth working roll is a negative crown roll shape of the second crown, the roll shape of the sixth working roll and the seventh working roll is a negative crown single-sided tapered roll shape of the third crown, the roll shape of the eighth working roll is a negative crown roll shape of the fourth crown, and the target tonnage is less than the preset maximum tonnage.

[0022] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0023] The embodiment of the present invention provides a method, device, equipment and system for rolling an extreme thin gauge plate. A roughing mill and a finishing mill are used during rolling. The roughing mill includes a roughing support roll and a roughing working roll. The finishing mill includes a finishing support roll and a finishing working roll. The roughing working roll includes a first working roll, a second working roll and a third working roll. The finishing working roll includes a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll. The method includes: before rolling the extreme thin gauge plate, the roughing support roll and the finishing support roll are both replaced with flat rolls and support rolls with corresponding target tonnages to reduce the influence of uneven wear of the rolls on the plate shape and reduce the defects of double-sided waves; the roughing working roll and the finishing working roll are both replaced with working rolls with corresponding roll shapes and target roll diameters so that the rolling The machine load is evenly distributed, which is beneficial to the control of the plate shape; wherein, the roll type of the first working roll and the second working roll is a negative convex roll type of the first convexity, the roll type of the third working roll and the fourth working roll is a CVC roll type, the roll type of the fifth working roll is a negative convex roll type of the second convexity, the roll type of the sixth working roll and the seventh working roll is a single-sided tapered roll type of the negative convexity of the third convexity, and the roll type of the eighth working roll is a negative convexity roll type of the fourth convexity, which reduces the edge jitter of the strip and ensures the stability of rolling; wherein, the target tonnage is less than the preset maximum tonnage; after replacing the roughing support roll, the roughing working roll, the finishing support roll and the finishing working roll, the roughing mill and the finishing mill are controlled to roll the slab to obtain the extreme thin-gauge plate, obtain the extreme thin-gauge plate with good plate shape, and reduce the occurrence of rolling breakage and steel piling accidents.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0026] Figure 1 It is a structural schematic diagram of a thin slab continuous casting and rolling production line provided by an embodiment of the present invention;

[0027] Figure 2 It is a flow chart of a rolling method of an extreme thin gauge plate provided by an embodiment of the present invention;

[0028] Figure 3 It is a structural block diagram of a rolling device for extremely thin gauge plates provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation mode of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0030] Before introducing in detail the rolling method of the extreme thin-gauge plate provided by the present invention, a brief introduction to the implementation environment involved is first given.

[0031] Figure 1 Schematic diagram of a thin slab continuous casting and rolling production line provided by an embodiment of the present invention. Figure 2 As shown, the production line includes a thin slab continuous casting machine 1, a tunnel furnace 2, a roughing mill 3, a finishing mill 4, a laminar cooling 5, a high-speed flying shear 6 and a coiler 7. The roughing mill 3 and the finishing mill 4 are used to roll the slab to obtain an extremely thin plate with a thickness that meets the requirements.

[0032] In this embodiment, the roughing mill includes a roughing support roll and a roughing working roll, and the finishing mill includes a finishing support roll and a finishing working roll. The roughing working roll includes a first working roll 31, a second working roll 32, and a third working roll 33 in order according to the running direction of the slab, the roughing support roll includes a first support roll 34, a second support roll 35, and a third support roll 36 in order according to the running direction of the slab, the finishing working roll includes a fourth working roll 41, a fifth working roll 42, a sixth working roll 43, a seventh working roll 44, and an eighth working roll 45 in order according to the running direction of the slab, and the finishing support roll includes a fourth support roll 46, a fifth support roll 47, a sixth support roll 48, a seventh support roll 49, and an eighth support roll 50 in order according to the running direction of the slab. The support roll is used to support the working roll, and the working roll is used to directly perform rolling processing on the rolled piece (slab).

[0033] Figure 2 : is a flow chart of a rolling method of an extreme thin gauge plate provided by an embodiment of the present invention, such as Figure 2 As shown, the method includes:

[0034] Step S210, before rolling the extreme thin gauge plate, replace the roughing support rolls and the finishing support rolls with flat rolls and support rolls with corresponding target tonnages, and replace the roughing working rolls and the finishing working rolls with working rolls with corresponding roll shapes and target roll diameters.

[0035] Among them, the roll type of the first working roll and the second working roll is a negative convex roll type with a first convexity, the roll type of the third working roll and the fourth working roll is a CVC roll type, the roll type of the fifth working roll is a negative convex roll type with a second convexity, the roll type of the sixth working roll and the seventh working roll is a single-sided tapered roll type with a negative convexity with a third convexity, and the roll type of the eighth working roll is a negative convex roll type with a fourth convexity.

[0036] The target tonnage is less than the preset maximum tonnage. The tonnage of the support roller refers to the cumulative total weight of the slabs rolled during the use of the support roller.

[0037] In this embodiment, both the roughing support rolls and the finishing support rolls are replaced with flat roll type support rolls, which is more conducive to controlling the plate shape during the rolling process; and selecting support rolls with corresponding target tonnage can reduce uneven wear on the slab, reduce double-side wave defects, and avoid puncture and steel pile accidents; both the roughing working rolls and the finishing working rolls are replaced with working rolls with corresponding target roll diameters, which can make the load distribution of the rolling mill more uniform and reduce middle wave defects; selecting a suitable roll type for each working roll can reduce the jitter of the strip edge and improve rolling stability.

[0038] Step S220, after replacing the roughing support rolls, the roughing working rolls, the finishing support rolls and the finishing working rolls, the roughing mill and the finishing mill are controlled to roll the slab to obtain an extremely thin gauge plate.

[0039] In this embodiment, before the production line produces the ultra-thin gauge plate, all the replaced working rolls of the roughing mill and the finishing mill are new rolls. When all the preparations are completed, the roughing mill and the finishing mill are controlled to operate, and the slab is rolled to obtain the ultra-thin gauge plate with good plate shape.

[0040] Optionally, the target tonnages corresponding to the first support roller, the second support roller and the third support roller decrease in sequence.

[0041] In this embodiment, the larger the tonnage of the supporting roller, the more severe the wear, which is not conducive to the plate shape control. Therefore, the target tonnages corresponding to the first supporting roller, the second supporting roller and the third supporting roller can be gradually reduced, which can not only ensure the plate shape quality but also increase the service life of the supporting roller.

[0042] Optionally, the maximum tonnage of the first support roller, the second support roller and the third support roller is 140,000 tons.

[0043] In this embodiment, the target tonnage of the first support roller, the second support roller, and the third support roller cannot exceed 140,000 tons, so that the plate shape quality of the rolled extreme thin-gauge plate is better.

[0044] Optionally, the maximum tonnages corresponding to the fourth support roller, the fifth support roller, the sixth support roller, the seventh support roller and the eighth support roller are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons respectively.

[0045] In this embodiment, the tonnage of the fourth support roller cannot exceed 110,000 tons, the tonnage of the fifth support roller cannot exceed 110,000 tons, the tonnage of the sixth support roller cannot exceed 60,000 tons, the tonnage of the seventh support roller cannot exceed 60,000 tons, and the tonnage of the eighth support roller cannot exceed 60,000 tons. At this time, the plate shape quality of the rolled extreme thin-gauge plate is better and the defects are greatly reduced.

[0046] Optionally, the absolute values ​​of the first convexity, the second convexity, the third convexity and the fourth convexity decrease successively.

[0047] In this embodiment, the negative crown of the working roll of the roughing mill is small. When the slab is thinned to the limit thin specification, the crown of the intermediate slab of the strip at the outlet of the third working roll will be small, which cannot meet the requirements of the subsequent finishing mill for plate shape control. The third and fourth working rolls are both CVC (Continuous Variable Crown) type working rolls. The exit of the fourth working roll is most likely to have double-sided wave defects, and the exits of the sixth to eighth working rolls are prone to cause the edge of the strip to shake. Therefore, the absolute value of the crown of other working rolls should be gradually reduced according to the direction of the slab running to avoid double-sided wave defects and reduce the shaking of the edge of the strip, thereby improving the stability of rolling.

[0048] Optionally, the first convexity is -0.95 mm, the second convexity is -0.26 mm, the third convexity is -0.18 mm and the fourth convexity is -0.08 mm.

[0049] In this embodiment, working rolls with a negative convexity of -0.95 mm are selected as the first working roll and the second working roll, working rolls with a CVC roll type are selected as the third working roll and the fourth working roll, working rolls with a negative convexity of -0.26 mm are selected as the fifth working roll, working rolls with a negative convexity of -0.18 mm and a single-sided tapered roll type are selected as the sixth working roll and the seventh working roll, and working rolls with a negative convexity of -0.08 mm are selected as the eighth working roll, so that the shape quality of the rolled extreme thin-gauge plate is better.

[0050] Optionally, the target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are in the range of 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm respectively.

[0051] In this embodiment, in order to distribute the mill load more evenly, the target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are within the target range. Within this range, the load distribution is reasonable and the strip shape is well controlled. Among them, the target roll diameters corresponding to the first working roll, the second working roll and the third working roll of the roughing mill can be controlled to decrease in sequence.

[0052] For example, the target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are 906mm, 831mm, 795mm, 810mm, 784mm, 627mm, 583mm and 584mm, respectively. This makes the load distribution of the rolling mill very uniform, the shape quality of the extremely thin gauge plate rolled out is better, and the stable production of the extremely thin gauge plate is achieved.

[0053] Using the method in the above embodiment for rolling, when rolling the ultimate thin plate with a thickness of ≤0.9mm, the maximum number of coils in a single roll period reaches 17 coils; when rolling the ultimate thin plate with a thickness of ≤0.8mm, the maximum number of coils in a single roll period reaches 16 coils, achieving large-scale stable production of thin specifications on the production line. Based on the production of 5,000 tons per month and the profit of 50 yuan per ton of steel, the annual benefit can be increased by: 5,000*50*12=3 million yuan, which improves production efficiency and production income.

[0054] Based on the same inventive concept, an embodiment of the present invention further provides a rolling device for extremely thin gauge plates, wherein a roughing mill and a finishing mill are used during rolling, wherein the roughing mill includes a roughing support roll and a roughing working roll, and the finishing mill includes a finishing support roll and a finishing working roll, wherein the roughing working roll includes a first working roll, a second working roll and a third working roll, and the finishing working roll includes a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll, Figure 3 : is a structural block diagram of a rolling device for extremely thin gauge plates provided by an embodiment of the present invention, such as Figure 3 As shown, the device 300 includes a replacement module 301 and a control module 302 .

[0055] A replacement module 301 is used for replacing both the roughing support roll and the finishing support roll with flat rolls and support rolls of corresponding target tonnage before rolling the extreme thin gauge plate, replacing both the roughing work roll and the finishing work roll with work rolls of corresponding target roll diameter, replacing the first work roll and the second work roll with work rolls of negative crown roll type with first convexity, replacing the third work roll and the fourth work roll with work rolls of CVC roll type, replacing the fifth work roll with work rolls of negative crown roll type with second convexity, replacing the sixth work roll and the seventh work roll with work rolls of negative crown single-sided tapered roll type with third convexity, and replacing the eighth work roll with work rolls of negative crown roll type with fourth convexity, wherein the target tonnage is less than the preset maximum tonnage;

[0056] The control module 302 is used to control the roughing mill and the finishing mill to roll the slab to obtain an extremely thin gauge slab after replacement.

[0057] Optionally, the rough rolling support rollers include a first support roller, a second support roller and a third support roller in sequence according to the running direction of the slab, and the target tonnages corresponding to the first support roller, the second support roller and the third support roller decrease in sequence.

[0058] Optionally, the maximum tonnage of the first support roller, the second support roller and the third support roller is 140,000 tons.

[0059] Optionally, the finishing rolling support rollers include a fourth support roller, a fifth support roller, a sixth support roller, a seventh support roller and an eighth support roller in order according to the running direction of the slab, and the maximum tonnages corresponding to the fourth support roller, the fifth support roller, the sixth support roller, the seventh support roller and the eighth support roller are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons respectively.

[0060] Optionally, the absolute values ​​of the first convexity, the second convexity, the third convexity and the fourth convexity decrease successively.

[0061] Optionally, the first convexity is -0.95 mm, the second convexity is -0.26 mm, the third convexity is -0.18 mm and the fourth convexity is -0.08 mm.

[0062] Optionally, the target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are in the range of 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm respectively.

[0063] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0064] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0065] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above-mentioned chips.

[0066] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0067] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0068] The processor implements any one of the methods for rolling extreme thin gauge plates in the above-mentioned embodiments by reading and executing computer program instructions stored in the memory.

[0069] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0070] In addition, in combination with the rolling method of the extreme thin gauge plate in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the rolling methods of the extreme thin gauge plate in the above embodiment is implemented.

[0071] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0072] Based on the same inventive concept, an embodiment of the present invention further provides a rolling system for an extreme thin gauge plate, the rolling system comprising a roughing mill and a finishing mill, the roughing mill comprising a roughing support roll and a roughing working roll, the finishing mill comprising a finishing support roll and a finishing working roll, the roughing working rolls sequentially comprising a first working roll, a second working roll and a third working roll according to the running direction of the slab, and the finishing working rolls sequentially comprising a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll according to the running direction of the slab;

[0073] The roll types of the roughing support roll and the finishing support roll are both flat roll types and the tonnage is the corresponding target tonnage, and the roll types of the roughing work roll and the finishing work roll are the corresponding roll types and the roll diameters are the corresponding target roll diameters;

[0074] Among them, the roll shape of the first working roll and the second working roll is a negative crown roll shape of the first crown, the roll shape of the third working roll and the fourth working roll is a CVC roll shape, the roll shape of the fifth working roll is a negative crown roll shape of the second crown, the roll shape of the sixth working roll and the seventh working roll is a single-sided tapered roll shape of a negative crown of the third crown, the roll shape of the eighth working roll is a negative crown roll shape of the fourth crown, and the target tonnage is less than the preset maximum tonnage.

[0075] Optionally, the rough rolling support rollers include a first support roller, a second support roller and a third support roller in sequence according to the running direction of the slab, and the target tonnages corresponding to the first support roller, the second support roller and the third support roller decrease in sequence.

[0076] Optionally, the maximum tonnage of the first support roller, the second support roller and the third support roller is 50,000 tons.

[0077] Optionally, the finishing rolling support rollers include a fourth support roller, a fifth support roller, a sixth support roller, a seventh support roller and an eighth support roller in order according to the running direction of the slab, and the maximum tonnages corresponding to the fourth support roller, the fifth support roller, the sixth support roller, the seventh support roller and the eighth support roller are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons respectively.

[0078] Optionally, the absolute values ​​of the first convexity, the second convexity, the third convexity and the fourth convexity decrease successively.

[0079] Optionally, the first convexity is -0.95 mm, the second convexity is -0.26 mm, the third convexity is -0.18 mm and the fourth convexity is -0.08 mm.

[0080] Optionally, the target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are in the range of 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm respectively.

[0081] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0082] The embodiment of the present invention provides a method, device, equipment and system for rolling an extreme thin gauge plate. A roughing mill and a finishing mill are used during rolling. The roughing mill includes a roughing support roll and a roughing working roll. The finishing mill includes a finishing support roll and a finishing working roll. The roughing working roll includes a first working roll, a second working roll and a third working roll. The finishing working roll includes a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll. The method includes: before rolling the extreme thin gauge plate, the roughing support roll and the finishing support roll are both replaced with flat rolls and support rolls with corresponding target tonnages to reduce the influence of uneven wear of the rolls on the plate shape and reduce the defects of double-sided waves; the roughing working roll and the finishing working roll are both replaced with working rolls with corresponding roll shapes and target roll diameters so that the rolling The machine load is evenly distributed, which is beneficial to the control of the plate shape; wherein, the roll type of the first working roll and the second working roll is a negative convex roll type of the first convexity, the roll type of the third working roll and the fourth working roll is a CVC roll type, the roll type of the fifth working roll is a negative convex roll type of the second convexity, the roll type of the sixth working roll and the seventh working roll is a single-sided tapered roll type of the negative convexity of the third convexity, and the roll type of the eighth working roll is a negative convexity roll type of the fourth convexity, which reduces the edge jitter of the strip and ensures the stability of rolling; wherein, the target tonnage is less than the preset maximum tonnage; after replacing the roughing support roll, the roughing working roll, the finishing support roll and the finishing working roll, the roughing mill and the finishing mill are controlled to roll the slab to obtain the extreme thin-gauge plate, obtain the extreme thin-gauge plate with good plate shape, and reduce the occurrence of rolling breakage and steel piling accidents.

[0083] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0084] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0085] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A method for rolling an extremely thin plate, characterized in that: A roughing mill and a finishing mill are used during rolling, the roughing mill includes a roughing support roll and a roughing working roll, the finishing mill includes a finishing support roll and a finishing working roll, the roughing working rolls include a first working roll, a second working roll and a third working roll in sequence according to the running direction of the slab, and the finishing working rolls include a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll in sequence according to the running direction of the slab, and the method includes: Before rolling the extreme thin gauge plate, the rough rolling support roll and the finishing support roll are both replaced with flat rolls and support rolls with corresponding target tonnage, and the rough rolling work roll and the finishing work roll are both replaced with work rolls with corresponding roll shapes and target roll diameters, wherein the roll shapes of the first work roll and the second work roll are negative convex roll shapes of the first convexity, the roll shapes of the third work roll and the fourth work roll are CVC roll shapes, the roll shape of the fifth work roll is negative convex roll shapes of the second convexity, the roll shape of the sixth work roll and the seventh work roll is negative convex single-sided tapered roll shape of the third convexity, the roll shape of the eighth work roll is negative convex roll shape of the fourth convexity, and the target tonnage is less than the preset maximum tonnage; After replacing the roughing support roll, the roughing working roll, the finishing support roll and the finishing working roll, the roughing mill and the finishing mill are controlled to roll the slab to obtain the extreme thin gauge plate.

2. The method for rolling an extremely thin plate according to claim 1, characterized in that: The rough rolling support rollers include a first support roller, a second support roller and a third support roller in sequence according to the running direction of the slab, and the target tonnages corresponding to the first support roller, the second support roller and the third support roller decrease in sequence.

3. The method for rolling an extremely thin plate according to claim 2, characterized in that: The maximum tonnage of the first support roller, the second support roller and the third support roller is 140,000 tons.

4. The method for rolling an extremely thin plate according to claim 3, characterized in that: The finishing rolling support rollers include a fourth support roller, a fifth support roller, a sixth support roller, a seventh support roller and an eighth support roller in order according to the running direction of the slab, and the maximum tonnages corresponding to the fourth support roller, the fifth support roller, the sixth support roller, the seventh support roller and the eighth support roller are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons respectively.

5. The method for rolling an extremely thin plate according to claim 1, characterized in that: The absolute values ​​of the first convexity, the second convexity, the third convexity and the fourth convexity decrease in sequence.

6. The method for rolling an extremely thin plate according to claim 5, characterized in that: The first convexity is -0.95 mm, the second convexity is -0.26 mm, the third convexity is -0.18 mm, and the fourth convexity is -0.08 mm.

7. The method for rolling an extremely thin plate according to claim 1, characterized in that: The target roll diameters corresponding to the first working roll, the second working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll, the seventh working roll and the eighth working roll are in the range of 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm respectively.

8. A rolling device for extremely thin gauge plates, characterized in that: A roughing mill and a finishing mill are used during rolling, wherein the roughing mill comprises a roughing support roll and a roughing working roll, and the finishing mills each comprise a finishing support roll and a finishing working roll, wherein the roughing working roll comprises a first working roll, a second working roll and a third working roll, and wherein the finishing working roll comprises a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll, and wherein the device comprises: A replacement module is used for replacing the roughing support roll and the finishing support roll with flat rolls and support rolls with corresponding target tonnages before rolling the extreme thin gauge plate, and replacing the roughing work roll and the finishing work roll with work rolls with corresponding roll shapes and target roll diameters, wherein the roll shapes of the first work roll and the second work roll are negative convex roll shapes of the first convexity, the roll shapes of the third work roll and the fourth work roll are CVC roll shapes, the roll shape of the fifth work roll is negative convex roll shapes of the second convexity, the roll shape of the sixth work roll and the seventh work roll is negative convex single-sided tapered roll shape of the third convexity, the roll shape of the eighth work roll is negative convex roll shape of the fourth convexity, and the target tonnage is less than the preset maximum tonnage; A control module is used to control the roughing mill and the finishing mill to roll the slab to obtain the extreme thin gauge plate after replacing the roughing support roll, the roughing working roll, the finishing support roll and the finishing working roll.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A rolling system for extremely thin gauge plates, characterized in that: The rolling system comprises a roughing mill and a finishing mill, wherein the roughing mill comprises a roughing support roll and a roughing working roll, and the finishing mill comprises a finishing support roll and a finishing working roll, wherein the roughing working rolls comprise a first working roll, a second working roll and a third working roll in sequence according to the running direction of the slab, and the finishing working rolls comprise a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll in sequence according to the running direction of the slab; The roughing support roll and the finishing support roll are both flat rolls and have a tonnage corresponding to a target tonnage, and the roughing work roll and the finishing work roll are both flat rolls and have a tonnage corresponding to a target tonnage; Among them, the roll shape of the first working roll and the second working roll is a negative crown roll shape of the first crown, the roll shape of the third working roll and the fourth working roll is a CVC roll shape, the roll shape of the fifth working roll is a negative crown roll shape of the second crown, the roll shape of the sixth working roll and the seventh working roll is a negative crown single-sided tapered roll shape of the third crown, the roll shape of the eighth working roll is a negative crown roll shape of the fourth crown, and the target tonnage is less than the preset maximum tonnage.

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