Method, device, apparatus and system for rolling of extreme thin gauge plates

Abstract

The application discloses a rolling method, device, equipment and system for limit-thin-specification plates. The method comprises the following steps: before rolling the limit-thin-specification plates, the rough rolling backup roll and the finish rolling backup roll are both replaced by the backup rolls of the flat roll type and with the corresponding target tonnage, and the rough rolling work roll and the finish rolling work roll are both replaced by the work rolls with the corresponding roll type and target roll diameter, wherein the roll type of the first work roll and the second work roll is the negative crown roll type of the first convexity, the roll type of the third work roll and the fourth work roll is the CVC roll type, the roll type of the fifth work roll is the negative crown roll type of the second convexity, the roll type of the sixth work roll and the seventh work roll is the negative single-side taper roll type of the third convexity, and the roll type of the eighth work roll is the negative crown roll type of the fourth convexity, and the target tonnage is less than the preset maximum tonnage; after the replacement, the rough rolling mill and the finish rolling mill are controlled to roll the slabs so as to obtain the limit-thin-specification plates with good plate shapes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy, and particularly relates to a rolling method, device, equipment and system of limit thin gauge plate. BACKGROUND

[0002] The limit thin gauge plate refers to a steel plate with a thickness far below the standard of traditional steel plates, and the thickness is generally below 0.83 mm. The production technology and product quality of the limit thin gauge plate represent the top level of the steel industry. The rolling process of the limit thin gauge plate is very complex and has a very high technical difficulty, and needs to go through multiple processes such as uncoiling, threading, reduction, rolling and recoiling. Since the thickness of these plates is far below that of ordinary steel plates, brittle fracture is prone to occur during the rolling process, and therefore there are very high requirements for the rolling mill precision control, operation skills, roll assembly preparation and process system.

[0003] In the related art, the centering condition of each stand is scanned and observed during rolling, and if a certain stand deviates, the stand is leveled to ensure that the plate shape quality meets the requirements.

[0004] However, when the above method is used for rolling, the strip steel is prone to have double edge wave plate shape defects, and even leads to a rolling breakage and steel stacking accident. SUMMARY

[0005] In view of the above problems, the present application is proposed to provide a rolling method, device, equipment and system of limit thin gauge plate to solve the above problems, select appropriate tonnage and roll type backup rolls for the roughing mill and finishing mill, select appropriate roll type and roll diameter work rolls for the roughing mill and finishing mill, and roll out limit thin gauge plates with better plate shape to reduce the occurrence of rolling breakage and steel stacking accidents.

[0006] In a first aspect, the present application provides a rolling method of limit thin gauge plate, the method comprising: using a roughing mill and a finishing mill during rolling, the roughing mill comprising roughing backup rolls and roughing work rolls, the finishing mill comprising finishing backup rolls and finishing work rolls, the roughing work rolls comprising first work rolls, second work rolls and third work rolls in sequence according to the running direction of a slab, the finishing work rolls comprising fourth work rolls, fifth work rolls, sixth work rolls, seventh work rolls and eighth work rolls in sequence according to the running direction of the slab, and the method comprising:

[0007] Before rolling the limit thin gauge plate, the rough rolling backup rolls and the finishing rolling backup rolls are all replaced into flat roll type and backup rolls with corresponding target tonnage, the rough rolling work rolls and the finishing rolling work rolls are all replaced into work rolls with corresponding roll type and target roll diameter, wherein the roll type of the first work roll and the second work roll is negative crown roll type of the first convexity, the roll type of the third work roll and the fourth work roll is CVC roll type, the roll type of the fifth work roll is negative crown roll type of the second convexity, the roll type of the sixth work roll and the seventh work roll is negative single side taper roll type of the third convexity, the roll type of the eighth work roll is negative crown roll type of the fourth convexity, and the target tonnage is less than a preset maximum tonnage.

[0008] After replacing the rough rolling backup rolls, the rough rolling work rolls, the finishing rolling backup rolls and the finishing rolling work rolls, the rough rolling mill and the finishing rolling mill are controlled to roll the slab to obtain the limit thin gauge plate.

[0009] Optionally, the rough rolling backup rolls sequentially comprise a first backup roll, a second backup roll and a third backup roll in the running direction of the slab, and the corresponding target tonnage of the first backup roll, the second backup roll and the third backup roll decreases in turn.

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

[0011] Optionally, the finishing rolling backup rolls sequentially comprise a fourth backup roll, a fifth backup roll, a sixth backup roll, a seventh backup roll and an eighth backup roll in the running direction of the slab, and the corresponding maximum tonnage of the fourth backup roll, the fifth backup roll, the sixth backup roll, the seventh backup roll and the eighth backup roll is 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons in turn.

[0012] Optionally, the absolute value of the first convexity, the second convexity, the third convexity and the fourth convexity decreases in turn.

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

[0014] Optionally, the target roll diameter of the first work roll, the second work roll, the third work roll, the fourth work roll, the fifth work roll, the sixth work roll, the seventh work roll and the eighth work roll ranges from 820 mm to 950 mm, 820 mm to 950 mm, 730 mm to 830 mm, 780 mm to 820 mm, 745 mm to 800 mm, 590 mm to 630 mm, 570 mm to 610 mm and 570 mm to 610 mm, respectively.

[0015] In a second aspect, the present application provides a rolling device for rolling an ultra-thin gauge plate, wherein a rough rolling mill and a finishing rolling mill are used in the rolling, the rough rolling mill comprises a rough rolling backup roll and a rough rolling work roll, the finishing rolling mill comprises a finishing rolling backup roll and a finishing rolling work roll, the rough rolling work roll comprises a first work roll, a second work roll and a third work roll, the finishing rolling work roll comprises a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll, and the device comprises:

[0016] a replacement module, configured to replace the rough rolling backup roll and the finishing rolling backup roll into backup rolls of a flat roll type and having a corresponding target tonnage, and replace the rough rolling work roll and the finishing rolling work roll into work rolls having a corresponding roll type and target roll diameter before rolling the ultra-thin gauge plate, wherein the roll type of the first work roll and the second work roll is a negative crown roll type of a first convexity, the roll type of the third work roll and the fourth work roll is a CVC roll type, the roll type of the fifth work roll is a negative crown roll type of a second convexity, the roll type of the sixth work roll and the seventh work roll is a negative single-side taper roll type of a third convexity, the roll type of the eighth work roll is a negative crown roll type of a fourth convexity, and the target tonnage is less than a preset maximum tonnage;

[0017] a control module, configured to control the rough rolling mill and the finishing rolling mill to roll the slab to obtain the ultra-thin gauge plate after replacing the rough rolling backup roll, the rough rolling work roll, the finishing rolling backup roll and the finishing rolling work roll.

[0018] In a third aspect, the present application provides an electronic device, comprising a memory and a processor, which are in communication connection with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method of the first aspect.

[0019] In a fourth aspect, the present application provides a rolling system for an ultra-thin gauge plate, the rolling system comprising a rough rolling mill and a finish rolling mill, the rough rolling mill comprising a rough rolling backup roll and a rough rolling work roll, the finish rolling mill comprising a finish rolling backup roll and a finish rolling work roll, the rough rolling work roll comprising a first work roll, a second work roll and a third work roll in sequence in a running direction of a slab, the finish rolling work roll comprising a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll in sequence in the running direction of the slab;

[0020] the backup rolls of the rough rolling mill and the finish rolling mill are flat backup rolls with a target tonnage, the work rolls of the rough rolling mill and the finish rolling mill are backup rolls with a corresponding roll type and a target roll diameter;

[0021] wherein the first work roll and the second work roll are negative crown work rolls with a first crown, the third work roll and the fourth work roll are CVC work rolls, the fifth work roll is a negative crown work roll with a second crown, the sixth work roll and the seventh work roll are negative single-sided tapered work rolls with a third crown, the eighth work roll is a negative crown work roll with a fourth crown, and the target tonnage is less than a preset maximum tonnage.

[0022] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0023] The embodiment of the present application provides a rolling method, device, equipment and system of limit thin gauge plate, the rough rolling mill and the finishing mill are used during rolling, the rough rolling mill comprises a rough rolling backup roll and a rough rolling work roll, the finishing mill comprises a finishing rolling backup roll and a finishing rolling work roll, the rough rolling work roll comprises a first work roll, a second work roll and a third work roll, the finishing rolling work roll comprises a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll, the method comprises the following steps: before rolling the limit thin gauge plate, the rough rolling backup roll and the finishing rolling backup roll are replaced into backup rolls of flat roll type and with corresponding target tonnage, the influence of uneven wear of the rolls on the plate shape is reduced, and the double edge wave defect is reduced; the rough rolling work roll and the finishing rolling work roll are replaced into work rolls with corresponding roll types and target roll diameters, so that the rolling mill load is evenly distributed, and the control of the plate shape is facilitated; wherein the roll type of the first work roll and the second work roll is a negative crown roll type of the first convexity, the roll type of the third work roll and the fourth work roll is a CVC roll type, the roll type of the fifth work roll is a negative crown roll type of the second convexity, the roll type of the sixth work roll and the seventh work roll is a negative crown single-side taper roll type of the third convexity, and the roll type of the eighth work roll is a negative crown roll type of the fourth convexity, so that the strip steel edge shaking is reduced, and the stability of rolling is ensured; wherein the target tonnage is less than a preset maximum tonnage; after the rough rolling backup roll, the rough rolling work roll, the finishing rolling backup roll and the finishing rolling work roll are replaced, the rough rolling mill and the finishing mill are controlled to roll the slab, so that the limit thin gauge plate is obtained, the limit thin gauge plate with good plate shape is obtained, and the occurrence of the rolling breakage and steel accumulation accident is reduced.

[0024] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the accompanying drawings indicate the same or similar elements throughout the several drawings. In the drawings:

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

[0027] Figure 2 is a flow chart of a rolling method of limit thin gauge plate provided by the embodiment of the present application;

[0028] Figure 3 is a structure block diagram of a rolling device of limit thin gauge plate provided by the embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the purposes, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the 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, but not limitations of the technical solutions of the present application. The technical features in the embodiments of the present application and the embodiments can be combined with each other without conflict.

[0030] Before the rolling method of the limit thin gauge plate provided by the present application is described in detail, the implementation environment involved will be briefly introduced.

[0031] Figure 1 is a structural schematic diagram of a thin slab continuous casting and rolling production line provided by an embodiment of the present application, as shown in Figure 2 The production line includes a thin slab continuous casting machine 1, a tunnel furnace 2, a rough rolling mill 3, a finish rolling mill 4, a laminar cooling device 5, a high-speed flying shear 6 and a coiler 7. The rough rolling mill 3 and the finish rolling mill 4 are used to roll the slab to obtain the limit thin gauge plate with a thickness meeting the requirements.

[0032] In the present embodiment, the rough rolling mill includes rough rolling backup rolls and rough rolling work rolls, and the finish rolling mill includes finish rolling backup rolls and finish rolling work rolls. The rough rolling work rolls include, in sequence according to the running direction of the slab, a first work roll 31, a second work roll 32 and a third work roll 33, and the rough rolling backup rolls include, in sequence according to the running direction of the slab, a first backup roll 34, a second backup roll 35 and a third backup roll 36. The finish rolling work rolls include, in sequence according to the running direction of the slab, a fourth work roll 41, a fifth work roll 42, a sixth work roll 43, a seventh work roll 44 and an eighth work roll 45, and the finish rolling backup rolls include, in sequence according to the running direction of the slab, a fourth backup roll 46, a fifth backup roll 47, a sixth backup roll 48, a seventh backup roll 49 and an eighth backup roll 50. The backup rolls are used to support the work rolls, and the work rolls are used to directly roll the workpiece (slab).

[0033] Figure 2 is a flowchart of a rolling method of a limit thin gauge plate provided by an embodiment of the present application, as shown in Figure 2 The method includes the following steps.

[0034] In step S210, before rolling the limit thin gauge plate, the rough rolling backup rolls and the finish rolling backup rolls are all replaced by backup rolls of the flat roll type and with corresponding target tonnages, and the rough rolling work rolls and the finish rolling work rolls are all replaced by work rolls with corresponding roll types and target roll diameters.

[0035] The roll type of the first work roll and the second work roll is a negative crown roll type of a first convexity, the roll type of the third work roll and the fourth work roll is a CVC roll type, the roll type of the fifth work roll is a negative crown roll type of a second convexity, the roll type of the sixth work roll and the seventh work roll is a negative single-side taper roll type of a third convexity, and the roll type of the eighth work roll is a negative crown roll type of a fourth convexity.

[0036] The target tonnage is less than a preset maximum tonnage. The tonnage of the backup roll refers to the total weight of the rolled slab during the use of the backup roll.

[0037] In the embodiment, the rough rolling backup roll and the finishing rolling backup roll are both replaced by backup rolls of the flat roll type, which is more conducive to the control of the slab shape during the rolling process. The backup rolls of the corresponding target tonnage are selected, which can reduce the uneven wear of the slab, reduce the double edge wave defects, and avoid the occurrence of the steel pile piercing accident. The rough rolling work roll and the finishing rolling work roll are both replaced by work rolls of the corresponding target roll diameter, which can make the rolling mill load distribution more uniform and reduce the middle wave defects. The appropriate roll type is selected for each work roll, which can reduce the strip edge shaking phenomenon and improve the rolling stability.

[0038] After the rough rolling backup roll, the rough rolling work roll, the finishing rolling backup roll and the finishing rolling work roll are replaced, the rough rolling mill and the finishing rolling mill are controlled to roll the slab to obtain the limit thin gauge plate.

[0039] In the embodiment, before the production line produces the limit thin gauge plate, all the replaced work rolls of the rough rolling mill and the finishing rolling mill are new rolls. When all the preparations are completed, the rough rolling mill and the finishing rolling mill are started to roll the slab to obtain the limit thin gauge plate with good slab shape.

[0040] Optionally, the target tonnages of the first backup roll, the second backup roll and the third backup roll decrease in turn.

[0041] In the embodiment, the greater the tonnage of the backup roll, the more serious the wear, which is not conducive to the control of the slab shape. Therefore, the target tonnages of the first backup roll, the second backup roll and the third backup roll can gradually decrease, which can not only ensure the slab shape quality, but also improve the service life of the backup roll.

[0042] Optionally, the maximum tonnages of the first backup roll, the second backup roll and the third backup roll are all 140,000 tons.

[0043] In the embodiment, the target tonnages of the first backup roll, the second backup roll and the third backup roll cannot exceed 140,000 tons, so that the slab shape quality of the rolled limit thin gauge plate is better.

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

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

[0046] Optionally, the absolute values of the first crown, the second crown, the third crown and the fourth crown are gradually reduced.

[0047] In the embodiment, the negative crown of the work roller of the rough rolling mill is smaller, when the slab is thinned to the limit thin gauge, the intermediate slab crown of the strip steel at the outlet of the third work roller is smaller, which cannot meet the demand of the plate shape control of the later finishing mill, the third work roller and the fourth work roller are all selected to be the work roller of the CVC (Continuous Variable Crown) roller type. The outlet of the fourth work roller is most prone to the double edge wave defect, the outlets of the sixth work roller to the eighth work roller are prone to the shaking of the edge of the strip steel, therefore, the absolute values of the crown of the other work rollers in the running direction of the slab are gradually reduced to avoid the double edge wave defect and reduce the shaking of the edge of the strip steel, and the stability of the rolling is improved.

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

[0049] In the embodiment, the work roller of the negative crown roller type with the crown of-0.95mm is selected as the first work roller and the second work roller, the work roller of the CVC roller type is selected as the third work roller and the fourth work roller, the work roller of the negative crown roller type with the crown of-0.26mm is selected as the fifth work roller, the work roller of the negative crown single-sided conical roller type with the crown of-0.18mm is selected as the sixth work roller and the seventh work roller, and the work roller of the negative crown roller type with the crown of-0.08mm is selected as the eighth work roller, so that the plate shape quality of the rolled limit thin gauge plate is better.

[0050] Optionally, the value ranges of the target roll diameters of the first work roller, the second work roller, the third work roller, the fourth work roller, the fifth work roller, the sixth work roller, the seventh work roller and the eighth work roller are 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm respectively.

[0051] In the embodiment, in order to more evenly distribute the rolling mill load, the target roll diameters corresponding to the first work roll, the second work roll, the third work roll, the fourth work roll, the fifth work roll, the sixth work roll, the seventh work roll and the eighth work roll are in the target range. Within the range interval, the load distribution is reasonable, and the strip shape is also good.

[0052] For example, the target roll diameters corresponding to the first work roll, the second work roll, the third work roll, the fourth work roll, the fifth work roll, the sixth work roll, the seventh work roll and the eighth work roll are 906 mm, 831 mm, 795 mm, 810 mm, 784 mm, 627 mm, 583 mm and 584 mm respectively. The rolling mill load is very evenly distributed, the shape quality of the rolled limit thin gauge plate is better, and the stable production of the limit thin gauge plate is realized.

[0053] When the method in the above embodiment is used for rolling, when rolling the limit thin gauge plate with a thickness ≤0.9 mm, the maximum number of coils continuously rolled in the single roll period reaches 17; when rolling the limit thin gauge plate with a thickness ≤0.8 mm, the maximum number of coils continuously rolled in the single roll period reaches 16, realizing the stable mass production of the thin gauge plate. According to the calculation of 5000 tons of production per month, 50 yuan of profit per ton of steel, the annual benefit increase is 300 million yuan, and the production efficiency and production benefit are improved.

[0054] Based on the same inventive concept, the embodiment of the present application also provides a rolling device for limit thin gauge plates. The rolling device uses a rough rolling mill and a finish rolling mill. The rough rolling mill includes rough rolling backup rolls and rough rolling work rolls. The finish rolling mill includes finish rolling backup rolls and finish rolling work rolls. The rough rolling work rolls include a first work roll, a second work roll and a third work roll. The finish rolling work rolls include a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll. Figure 3 is a structural block diagram of a rolling device for limit thin gauge plates provided by the embodiment of the present application, as shown in the figure, the device 300 includes a replacement module 301 and a control module 302. Figure 3

[0055] ​The replacing module 301 is configured to replace the rough rolling backup roll and the finishing rolling backup roll into backup rolls of the flat roll type and corresponding target tonnages before rolling the limit thin gauge plate, replace the rough rolling work roll and the finishing rolling work roll into work rolls corresponding to target roll diameters, replace the first work roll and the second work roll into work rolls of the negative crown roll type of the first crown, replace the third work roll and the fourth work roll into work rolls of the CVC roll type, replace the fifth work roll into a work roll of the negative crown roll type of the second crown, replace the sixth work roll and the seventh work roll into work rolls of the negative crown single-sided tapered roll type and the third crown, and replace the eighth work roll into a work roll of the negative crown roll type of the fourth crown, wherein the target tonnages are less than a preset maximum tonnage.

[0056] The control module 302 is configured to control the rough rolling mill and the finishing rolling mill to roll the slab to obtain the limit thin gauge plate after the replacement.

[0057] Optionally, the rough rolling backup roll comprises, in sequence according to the running direction of the slab, a first backup roll, a second backup roll and a third backup roll, and the target tonnages corresponding to the first backup roll, the second backup roll and the third backup roll decrease in sequence.

[0058] Optionally, the maximum tonnages of the first backup roll, the second backup roll and the third backup roll are all 140,000 tons.

[0059] Optionally, the finishing rolling backup roll comprises, in sequence according to the running direction of the slab, a fourth backup roll, a fifth backup roll, a sixth backup roll, a seventh backup roll and an eighth backup roll, and the maximum tonnages corresponding to the fourth backup roll, the fifth backup roll, the sixth backup roll, the seventh backup roll and the eighth backup roll are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons in sequence.

[0060] Optionally, the absolute values of the first crown, the second crown, the third crown and the fourth crown decrease in sequence.

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

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

[0063] It can be understood that the apparatus provided by the above embodiments is only exemplified by the division of the above functional modules, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the functions described above.

[0064] The electronic device can include a processor and a memory, wherein the processor and the memory can be connected to each other in communication through a bus or other means.

[0065] The processor can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or can be configured to implement one or more integrated circuits of the embodiments of the present application, or can 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, etc. chips, or a combination of the above chips.

[0066] The memory can include a mass storage for data or instructions. By way of example and not limitation, the memory can 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 can include removable or non-removable (or fixed) media. Where appropriate, the memory can be internal or external to the electronic device. In a particular embodiment, the memory can be a non-volatile solid-state memory.

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

[0068] The processor realizes the rolling method of the limit thin gauge plate in any one of the above-mentioned embodiments by reading and executing computer program instructions stored in the memory.

[0069] In an example, the electronic device can further include a communication interface and a bus. The processor, the memory, and the communication interface are connected through the bus and complete communication with each other. The communication interface is mainly used to realize communication between various modules, devices, units, and / or equipment in the embodiments of the application. In a suitable case, the bus can include one or more buses.

[0070] In addition, in combination with the rolling method of the limit thin gauge plate in the above-mentioned embodiments, the embodiments of the application can provide a computer readable storage medium to realize. The computer readable storage medium has computer program instructions stored thereon; the computer program instructions are executed by the processor to realize the rolling method of the limit thin gauge plate in any one of the above-mentioned embodiments.

[0071] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The program can be stored in a computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiments. 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 memories.

[0072] Based on the same inventive concept, the embodiments of the application also provide a rolling system for limit thin gauge plates. The rolling system includes a rough rolling mill and a finishing rolling mill. The rough rolling mill includes rough rolling backup rolls and rough rolling work rolls. The finishing rolling mill includes finishing rolling backup rolls and finishing rolling work rolls. The rough rolling work rolls include, in order according to the running direction of the slab, a first work roll, a second work roll, and a third work roll. The finishing rolling work rolls include, in order according to the running direction of the slab, a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll, and an eighth work roll.

[0073] The backup rolls of the rough rolling mill and the finishing rolling mill are flat rolls, and the tonnage is the corresponding target tonnage. The work rolls of the rough rolling mill and the finishing rolling mill are the corresponding roll types and the corresponding target roll diameters.

[0074] The roll type of the first work roll and the second work roll is a negative crown roll type of a first convexity, the roll type of the third work roll and the fourth work roll is a CVC roll type, the roll type of the fifth work roll is a negative crown roll type of a second convexity, the roll type of the sixth work roll and the seventh work roll is a negative single-side taper roll type of a third convexity, the roll type of the eighth work roll is a negative crown roll type of a fourth convexity, and the target tonnage is less than the preset maximum tonnage.

[0075] Optionally, the rough rolling backup rolls sequentially include a first backup roll, a second backup roll and a third backup roll in the running direction of the slab, and the target tonnages corresponding to the first backup roll, the second backup roll and the third backup roll decrease in turn.

[0076] Optionally, the maximum tonnages of the first backup roll, the second backup roll and the third backup roll are all 50,000 tons.

[0077] Optionally, the finishing rolling backup rolls sequentially include a fourth backup roll, a fifth backup roll, a sixth backup roll, a seventh backup roll and an eighth backup roll in the running direction of the slab, and the maximum tonnages corresponding to the fourth backup roll, the fifth backup roll, the sixth backup roll, the seventh backup roll and the eighth backup roll are 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons in turn.

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

[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 work roll, the second work roll, the third work roll, the fourth work roll, the fifth work roll, the sixth work roll, the seventh work roll and the eighth work roll are in the value ranges of 820-950 mm, 820-950 mm, 730-830 mm, 780-820 mm, 745-800 mm, 590-630 mm, 570-610 mm and 570-610 mm in turn.

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

[0082] The rolling method, device, equipment and system of the limit thin gauge plate provided by the embodiment of the application, the rough rolling mill and the finishing rolling mill are used during rolling, the rough rolling mill comprises rough rolling backup rolls and rough rolling working rolls, the finishing rolling mill comprises finishing rolling backup rolls and finishing rolling working rolls, the rough rolling working rolls comprise a first working roll, a second working roll and a third working roll, the finishing rolling working rolls comprise a fourth working roll, a fifth working roll, a sixth working roll, a seventh working roll and an eighth working roll, the method comprises the following steps: before rolling the limit thin gauge plate, the rough rolling backup rolls and the finishing rolling backup rolls are all replaced by backup rolls of the flat roll type and with corresponding target tonnages, so that the influence of uneven wear of the rolls on the plate shape is reduced, and the defect of double edge waves is reduced; the rough rolling working rolls and the finishing rolling working rolls are all replaced by working rolls with corresponding roll types and target roll diameters, so that the rolling mill load is evenly distributed, and the control of the plate shape is facilitated; wherein the roll type of the first working roll and the second working roll is a negative crown 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 crown roll type of the second convexity, the roll type of the sixth working roll and the seventh working roll is a negative crown single-side tapered roll type of the third convexity, and the roll type of the eighth working roll is a negative crown roll type of the fourth convexity, so that the strip steel edge shaking is reduced, and the stability of rolling is ensured; wherein the target tonnage is less than a preset maximum tonnage; after the rough rolling backup rolls, the rough rolling working rolls, the finishing rolling backup rolls and the finishing rolling working rolls are replaced, the rough rolling mill and the finishing rolling mill are controlled to roll the slab, so that the limit thin gauge plate is obtained, the limit thin gauge plate with good plate shape is obtained, and the occurrence of the rolling breakage and piling accident is reduced.

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

[0084] Similarly, it is to be appreciated that the various features described or recited in the above description of exemplary embodiments of the application maybe practiced in various combinations, and that the disclosure of this application is to be considered to encompass all such combinations. Moreover, it is to be understood that the disclosure of the present application is not to be limited to the particular details of the above-stated embodiments. Indeed, various modifications can be made thereto without departing from the spirit of the present application as will be described in the appended claims.

[0085] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices or means can be listed, comprising means which can be implemented by one and the same hardware item. The use of the word at the beginning of the claim does not preclude the use of the word later in the same claim. The provisions specified in the patent law and the patent regulation must be observed.

Claims

1. A method of rolling an extreme thin gauge sheet, characterized by, The rolling mill uses rough rolling mill and finishing rolling mill, the rough rolling mill includes rough rolling backup roll and rough rolling work roll, the finishing rolling mill includes finishing rolling backup roll and finishing rolling work roll, the rough rolling work roll includes first work roll, second work roll and third work roll in turn according to the running direction of the slab, the finishing rolling work roll includes fourth work roll, fifth work roll, sixth work roll, seventh work roll and eighth work roll in turn according to the running direction of the slab, the method includes: Before rolling the limit thin gauge plate, the rough rolling backup roll and the finishing rolling backup roll are replaced into flat roll type and backup roll with corresponding target tonnage, the rough rolling work roll and the finishing rolling work roll are replaced into work roll with corresponding roll type and target roll diameter, wherein the roll type of the first work roll and the second work roll is negative crown roll type of first convexity, the roll type of the third work roll and the fourth work roll is CVC roll type, the roll type of the fifth work roll is negative crown roll type of second convexity, the roll type of the sixth work roll and the seventh work roll is negative crown single side taper roll type of third convexity, the roll type of the eighth work roll is negative crown roll type of fourth convexity, the target tonnage is less than preset maximum tonnage; After replacing the rough rolling backup roll, the rough rolling work roll, the finishing rolling backup roll and the finishing rolling work roll, the rough rolling mill and the finishing rolling mill are controlled to roll the slab to obtain the limit thin gauge plate.

2. The method of claim 1, wherein, The rough rolling backup roll includes first backup roll, second backup roll and third backup roll in turn according to the running direction of the slab, the corresponding target tonnage of the first backup roll, the second backup roll and the third backup roll decreases in turn.

3. The method of claim 2, wherein the thickness of the extreme thin gauge sheet is less than 0.1 mm. The maximum tonnage of the first backup roll, the second backup roll and the third backup roll is 140,000 tons.

4. The method of claim 3, wherein the thickness of the extreme thin gauge sheet is 0.1 mm or less. The finishing rolling backup roll includes fourth backup roll, fifth backup roll, sixth backup roll, seventh backup roll and eighth backup roll in turn according to the running direction of the slab, the corresponding maximum tonnage of the fourth backup roll, the fifth backup roll, the sixth backup roll, the seventh backup roll and the eighth backup roll is 110,000 tons, 110,000 tons, 60,000 tons, 60,000 tons and 60,000 tons in turn.

5. The method of claim 1, wherein The absolute value of the first convexity, the second convexity, the third convexity and the fourth convexity decreases in turn.

6. The method of claim 5, wherein the thickness of the extreme thin gauge sheet is less than 0.1 mm. The first convexity is-0.95mm, the second convexity is-0.26mm, the third convexity is-0.18mm and the fourth convexity is-0.08mm.

7. The method of claim 1, wherein The value range of the corresponding target roll diameter of the first work roll, the second work roll, the third work roll, the fourth work roll, the fifth work roll, the sixth work roll, the seventh work roll and the eighth work roll is 820-950mm, 820-950mm, 730-830mm, 780-820mm, 745-800mm, 590-630mm, 570-610mm and 570-610mm in turn.

8. A rolling device for an extreme thin gauge sheet, characterized by, The rolling system comprises a rough rolling mill and a finish rolling mill, the rough rolling mill comprises rough rolling backup rolls and rough rolling work rolls, the finish rolling mill comprises finish rolling backup rolls and finish rolling work rolls, the rough rolling work rolls comprise a first work roll, a second work roll and a third work roll, the finish rolling work rolls comprise a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll, and the device comprises: a replacement module configured to replace the rough rolling backup rolls and the finish rolling backup rolls into backup rolls of a flat roll type and having corresponding target tonnages, and to replace the rough rolling work rolls and the finish rolling work rolls into work rolls having corresponding roll types and target roll diameters, wherein the first work roll and the second work roll have a first convexity of a negative convexity roll type, the third work roll and the fourth work roll have a CVC roll type, the fifth work roll has a second convexity of a negative convexity roll type, the sixth work roll and the seventh work roll have a third convexity of a negative convexity single-side tapered roll type, the eighth work roll has a fourth convexity of a negative convexity roll type, and the target tonnages are less than a preset maximum tonnage; a control module configured to control the rough rolling mill and the finish rolling mill to roll a slab to obtain the limit thin gauge plate after the rough rolling backup rolls, the rough rolling work rolls, the finish rolling backup rolls and the finish rolling work rolls are replaced.

9. An electronic device, comprising: The rolling system comprises a rough rolling mill and a finish rolling mill, the rough rolling mill comprises rough rolling backup rolls and rough rolling work rolls, the finish rolling mill comprises finish rolling backup rolls and finish rolling work rolls, the rough rolling work rolls comprise a first work roll, a second work roll and a third work roll, the finish rolling work rolls comprise a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll, and the device comprises: a memory and a processor in communication connection with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method in any one of claims 1-7.

10. A rolling system of an extreme thin gauge sheet, characterized by, The rolling system comprises a rough rolling mill and a finish rolling mill, the rough rolling mill comprises rough rolling backup rolls and rough rolling work rolls, the finish rolling mill comprises finish rolling backup rolls and finish rolling work rolls, the rough rolling work rolls comprise a first work roll, a second work roll and a third work roll, the finish rolling work rolls comprise a fourth work roll, a fifth work roll, a sixth work roll, a seventh work roll and an eighth work roll, and the device comprises: The rough rolling backup rolls and the finish rolling backup rolls have a flat roll type and tonnages of corresponding target tonnages, and the rough rolling work rolls and the finish rolling work rolls have corresponding roll types and roll diameters of corresponding target roll diameters; wherein the first work roll and the second work roll have a first convexity of a negative convexity roll type, the third work roll and the fourth work roll have a CVC roll type, the fifth work roll has a second convexity of a negative convexity roll type, the sixth work roll and the seventh work roll have a third convexity of a negative convexity single-side tapered roll type, the eighth work roll has a fourth convexity of a negative convexity roll type, and the target tonnages are less than a preset maximum tonnage.

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