CN112570449B - Efficient double-rack double-shear-line straight-through medium plate production line and production method - Google Patents
Efficient double-rack double-shear-line straight-through medium plate production line and production method Download PDFInfo
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- CN112570449B CN112570449B CN201910942697.7A CN201910942697A CN112570449B CN 112570449 B CN112570449 B CN 112570449B CN 201910942697 A CN201910942697 A CN 201910942697A CN 112570449 B CN112570449 B CN 112570449B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/222—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a rolling-drawing process; in a multi-pass mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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Abstract
An efficient double-rack double-shear-line straight-through medium plate production line and a production method thereof are disclosed, wherein the medium plate production line comprises: the main rolling line is at least two shearing lines which are arranged in parallel, and the straightening stacking lines are respectively arranged outside each shearing line in parallel; one of the shearing lines is directly arranged with the main rolling line; the main rolling line comprises: the device comprises a heating furnace, a high-pressure water descaling machine, a fixed width press machine, vertical rolls, a four-roll roughing mill, an intermediate cooling device, a four-roll finishing mill, an accelerated cooling device, a hot straightening machine, a 1# marking device, a hot sectional shear, a 1# cooling bed, a 1# inspection bench, a 2# cooling bed, a 2# inspection bench, at least two parallel shearing lines, a straightening stacking line, a plate turnover machine and a transverse moving bench, wherein the 1# cooling bed, the 1# inspection bench and the 2# cooling bed are arranged on two sides of the steel rolling conveying roller in sequence along a steel rolling conveying roller way, the straightening stacking line is arranged on the outer side of each shearing line in parallel, the plate turnover machine is arranged between the shearing lines, and the transverse moving bench is arranged between the shearing lines and the straightening stacking line. The invention can greatly improve the rolling, finishing and warehousing efficiency of the medium plate production line.
Description
Technical Field
The invention relates to a thick plate rolling technology, in particular to an efficient double-rack double-shear-line straight-through medium plate production line and a production method.
Background
The medium plate is an important steel material on which national economic development depends, and is used for shipbuilding, building structures, bridge construction, military industry, large-caliber welded pipes and the like. At present, china has 76 medium plate production lines (68 production lines capable of producing effectively) in total, and the design capacity is 9374 ten thousand tons/year. The production capacity of the medium and heavy plates in China is extremely unbalanced. In east China, north China and Central and south China, the production capacity of the medium plate is high, and the produced medium plate product needs to be sold partially in other areas; the production capacity of the medium and heavy plate in the northeast region can basically meet the requirements of the medium and high end markets of the local region, and the requirements of the low end markets are filled by the production capacity outside the region; the medium plate market demand in northwest region is small, and the production capacity is also small; the production capacity of medium plates in south China and southwest areas is low, and market requirements are mainly met by foreign steel plates. The production capacity of medium plates in south China and southwest areas is obviously insufficient.
Therefore, the demand for expanding the capacity of the thick plates in partial areas is still very strong, and due to the fact that the number of the thick plate production lines in China is large, if the newly-built production line is designed by the traditional process layout, the indexes of production scale, cost and energy consumption are difficult to break through, market competitiveness is not formed, and the newly-built production line cannot survive well.
At present, no thick plate production line with the capacity exceeding 240 ten thousand tons/year exists. The general process arrangement of the existing thick plate production line mainly has the following defects:
1) The production capacity scale of a single production line rolling line and a finishing line is insufficient and generally does not exceed 200 ten thousand tons;
2) The domestic thick plate production line arrangement process is basically similar, and has no innovation and change;
3) The slab library path is too long due to design reasons, the hot charging rate is not high and is basically below 50%;
4) The capacity of the rolling line is not matched with that of the finishing line, and generally, the capacity of a rolling mill is greater than that of the finishing line in a back area, so that the capacity of the rolling mill cannot be fully exerted;
5) The rolling length is limited, and the maximum rolling length is not more than 52m generally, so that the rolling unit weight is low and the yield of a rolling mill is not high;
6) The rolled thick plate steel plate can enter a shear line only after being wound by one circle through a cooling bed, and the rolled steel plate cannot be directly connected.
Chinese patent CN201410302065 discloses a method for controlling steel plate rolling and conveying speed of a medium plate rolling production line, which sequentially comprises: the control method of the rolling and conveying speed of the steel plate is an integral coordinated speed automatic control method and comprises integral coordinated speed control of the last rolling process of the finishing mill, the roller way conveying process and the pre-straightening process.
Chinese patent CN201410302063 discloses a control method for temperature drop of a steel plate in a medium and heavy plate rolling production line process, and relates to an automatic speed control method for a rolling process of a rolling mill in the last pass and a roller way conveying process of the steel plate from a finishing mill to a control cooling device.
Disclosure of Invention
The invention aims to provide an efficient double-rack double-shear-line straight-through medium plate production line and a production method thereof, which can greatly improve the rolling, finishing and warehousing efficiency of the medium plate production line.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a two straight cut line of two frame of efficient cut straightway cut deal production line, it includes: the main rolling line is provided with at least two shearing lines which are arranged in parallel, and the straightening stacking lines are respectively arranged outside each shearing line in parallel; one of the shearing lines is arranged in direct communication with the main rolling line; wherein the content of the first and second substances,
the main rolling line comprises: the method comprises the following steps of sequentially arranging a heating furnace, a high-pressure water descaling machine, a fixed-width press machine, vertical rolls, a four-roll roughing mill, an intermediate cooling device, a four-roll finishing mill, an ACC (accelerated cooling control) device, a hot straightener, a 1# marking device, a hot section shear, a 1# cooling bed, a 1# inspection bench, a 2# cooling bed and a 2# inspection bench which are respectively arranged on two sides of a steel rolling conveying roller way along the steel rolling conveying roller way;
one of the shearing lines is directly arranged with the main rolling line steel rolling conveying roller bed; each shearing line comprises a shearing conveying roller way, and an ultrasonic flaw detection device, a head cutting shear, a double-sided shear, a 2# marking device, a fixed-length shear, a 3# marking device and a pre-stacker are sequentially arranged along the shearing conveying roller way; a panel turnover machine is arranged between the shearing lines.
The straightening stacking line comprises a straightening conveying roller way, a cold straightening machine, a 4# marking device and finished product collecting racks arranged on two sides of the straightening conveying roller way, wherein the cold straightening machine, the 4# marking device and the finished product collecting racks are sequentially arranged along the straightening conveying roller way;
and a transverse moving rack is arranged between the shearing line and the straightening stacking line.
Preferably, the heating furnace is provided with at least three heating furnaces, and a deburring machine and a weighing machine are sequentially arranged along a roller way of the heating furnace; preferably, the heating furnace roller way and the continuous casting roller way are directly communicated.
Preferably, the No. 1 cooling bed is arranged on one side of the steel rolling conveying roller way before the hot section shearing, namely the No. 1 cooling bed and the No. 1 inspection rack are arranged at a distance, part of steel plates needing to be stacked and cooled can be directly arranged in the open space between the No. 1 inspection rack and the No. 1 cooling bed, a natural heat preservation stacking and cooling interval can be formed by means of the No. 1 cooling bed and the No. 1 inspection rack, and the stacking and cooling effect of the steel plates can be improved; in addition, the arrangement is also favorable for relieving logistics at the joint of cold bed steel rolling and finishing line, has larger steel plate buffer area and is favorable for exerting productivity.
Preferably, a slab warehouse is arranged on one side of the heating furnace, and the slab warehouse and the heating furnace are provided with an operating room; and an operation chamber is arranged from the four-roller roughing mill to the ACC accelerated cooling device in the main rolling line.
Preferably, a plurality of operation chambers capable of simultaneously controlling corresponding equipment of the two shearing lines are arranged between the two shearing lines which are arranged in parallel; wherein, an operation room is arranged corresponding to the hot straightening machine, the cold bed, the inspection bench, the ultrasonic flaw detection and the crop shear; an operation chamber is arranged corresponding to the double-sided scissors; an operation room is arranged corresponding to the fixed-length shears, the check points and the pre-stacking machine.
Preferably, the two cutting lines are respectively arranged in the two plant spans.
Preferably, the 1# cooling bed and the 1# inspection rack extend to a third factory bay.
In the design of the thick plate production line of the invention:
the continuous casting roller way is directly communicated with the heating furnace roller way, so that the hot charging temperature and the hot charging rate of the steel plate are improved to the maximum extent and can reach more than 60 percent theoretically.
A shearing line roller way and a steel rolling roller way are in the same straight line, so that the function of directly cutting a rolled steel plate without passing through a cooling bed can be realized.
The hot section shears are arranged in front of the cooling bed, and the rolling length can be increased to more than 100 m.
After the rolling length is increased, the rolling unit weight can be effectively increased to more than 40 tons, and therefore the annual rolling capacity is 300 ten thousand tons.
The back of the rolling line corresponds to two high-efficiency shearing lines, the shearing capacity of the front area rolling and the shearing capacity of the back area are perfectly matched, and the thick plate production capacity with ultrahigh capacity can be formed.
The two cutting lines are respectively arranged in the two plant spans and are close to each other in the nearest distance, so that the optimal combination arrangement of the operation rooms is facilitated.
The No. 1 cooling bed and the No. 1 inspection rack extend to the third workshop span so as to carry out independent heap cooling on steel plates needing a heap cooling process, and the online shearing capacity is not influenced.
The invention relates to a method for efficiently producing a medium plate by a double-rack double-shear-line direct-connection medium plate production line, which comprises the following steps:
1) Directly sending the continuous casting plate blank to a heating furnace roller way in front of a heating furnace on line at the highest temperature through a continuous casting roller way, and deburring and weighing the continuous casting plate blank;
2) Weighing the continuous casting plate blank, and then loading the continuous casting plate blank into a heating furnace for heating according to a furnace loading plan;
3) After the continuous casting slab is heated to a target temperature, tapping steel enters a steel rolling conveying roller way of a main rolling line, and surface treatment is carried out through high-pressure water dephosphorization equipment to remove iron oxide scales on the surface of the continuous casting slab;
4) The continuous casting plate blank after the phosphorus removal by the high-pressure water reaches a fixed-width press machine to carry out on-line width adjustment so as to reach the required width before the vertical rolling mill; then the continuous casting plate blank reaches a vertical roll, and the planar shape, the head shape, the tail shape and the edge shape of the continuous casting plate blank are adjusted through the vertical roll so as to obtain good steel plate width dimension precision;
5) The continuous casting slab discharged from the vertical rolling mill is rolled to a four-high roughing mill to obtain an intermediate slab, the continuous casting slab is rolled to the set thickness and width, and a finished product can be rolled by a single stand under emergency conditions; the steel plate is not stretched and rolled;
6) After the rough-rolled plate blank reaches a four-roller finishing mill, rolling the plate blank into the required width and thickness of the steel plate according to the set times, the steel biting speed and the rolling reduction parameters, obtaining good plate shape and same plate difference, and simultaneously realizing the final rolling temperature of the steel plate with different temperature control requirements;
7) After the steel plate is rolled, the steel plate passes through an ACC accelerated cooling device according to whether a cooling control requirement exists or not, if the cooling requirement exists, the steel plate is cooled on line according to parameters such as cooling speed, flow, passing speed and the like set by a model to reach a target final cooling temperature, and therefore the mechanical property of the steel plate is improved; directly passing through the ACC accelerated cooling device for the steel plate without the controlled cooling requirement;
8) After passing through a cooling device, the steel plate passes through a hot straightening machine by a one-pass straightening process so as to improve the shape of the steel plate; if the rolled plate shape is poor, straightening passes can be increased;
9) After the steel plate is subjected to hot straightening, carrying out middle process marking on the steel plate at a No. 1 marking device so as to facilitate the middle process tracing of the steel plate;
10 The marked steel plate is rolled at a hot section shear for section so as to meet the requirement of the maximum length of the upper cooling bed; after the segmentation, different cooling beds can be selected for cooling the steel plate according to the logistics situation; the steel plate needing to be directly connected can directly enter a shearing roller way of a shearing line from a conveying roller way without going on a cooling bed;
11 The steel plate enters one of the two inspection platforms for inspection after being cooled and is transported to a shearing roller way of a shearing line;
12 After passing through the inspection bench, the temperature of the steel plate is reduced to be below 80 ℃, the steel plate enters a flaw detection device to carry out flaw detection operation according to different flaw detection requirements, and the steel plate which does not need flaw detection directly passes through the flaw detection device;
13 The steel plate enters a head cutting shear to cut the head and the tail after flaw detection is finished, the tongue-shaped part of the head is cut off, the length of the tongue-shaped part is segmented to be larger than 30m, and the length of the segment is adjusted according to the length of a roller way; the steel plate is segmented to prepare for later edge shearing; if the tail part of the steel plate is in a bad shape, the tail cutting treatment is required;
14 The steel plate enters the bilateral scissors after the head and the tail of the steel plate are cut off, the burrs on the two sides of the steel plate are cut off, and the position of a movable scissors of the bilateral scissors is preset according to the width of a cut finished product;
15 After the bilateral shearing is finished, the steel plate is subjected to sample spray printing in the marking device, and if the steel plate has no sample, the steel plate passes through the marking device in an empty way;
16 The steel plate passes through a marking device and enters a fixed-length shear, and the fixed-length shear shears shear the steel plate into the length required by the final contract; simultaneously, sampling steel plates with samples, taking the large samples, sending the large samples to a sample shear, and carrying out the next processing and performance test;
17 ) after the steel plate finished product is cut, feeding the steel plate finished product into a jet printing machine for jet printing of the finished product, and jet printing contract information, steel grades, classification society marks and flaw detection requirement information on the steel plate; if the shape of the steel plate is not good, only spraying the plate number, and then, passing through the transverse moving rack to perform cold correction spraying; if the plate turnover is needed, the plate turnover machine is transversely moved to the plate turnover machine for plate turnover inspection;
18 The steel plate enters a final check point of a product for checking after spray printing of the steel plate is finished, and if the steel plate is checked to have no problem, the steel plate directly passes through a pre-stacker and then is stored in a warehouse through a roller way; if the shape of the steel plate has a problem, respectively entering a cold straightening machine for correcting the shape of the steel plate through a transverse moving rack, and marking the steel plate by a marking device after the steel plate is corrected; and after marking is finished, the finished products enter a finished product warehouse through a conveying roller way, enter a finished product warehouse stacking position through a finished product collecting rack respectively according to stacking requirements, and wait for delivery.
Preferably, after the step 5), if the plate blank has the requirements of temperature control and finish rolling, water spraying cooling is carried out through an intermediate cooling device after rough rolling, and the plate blank temperature control functions with different requirements can be realized according to flow and speed parameters calculated by a cooling model; and part of the plate blank without temperature control requirement directly passes through the intermediate cooling device.
The invention has the beneficial effects that:
1. by adopting the production line arrangement and the production method, the production scale can reach 300 ten thousand tons/year, the production is high-efficiency, and the production cost is reduced;
2. the invention adopts ultra-long rolling, and the yield can reach more than or equal to 94 percent;
3. the production line is reasonable in arrangement and beneficial to merging of operation chambers, the main line can be provided with at least 8 operation chambers, the number of operators is reduced, and the labor production efficiency is improved by more than 50%;
4. the plate blank is directly communicated to the heating furnace area, and the hot charging rate can reach more than 60%;
5. the invention has convenient process arrangement and maintenance, and each unit equipment spare part can conveniently enter and exit a plant;
6. the production line only occupies 3 plant spans, and has small occupied area and high production efficiency.
Drawings
Fig. 1 is a schematic process arrangement 1 of example 1 of the present invention.
Fig. 2 is a schematic process layout 2 of example 1 of the present invention.
Fig. 3 is a schematic process arrangement 1 of example 2 of the present invention.
Fig. 4 is a schematic process layout 2 of example 2 of the present invention.
Detailed Description
For a more clear description of the technical solutions and advantages of the present invention, the following description of the embodiments is provided in conjunction with the accompanying drawings. The invention is only explained here and is not limited in any way.
Referring to fig. 1 and fig. 2, the present invention provides an efficient double-rack double-shear-line straight-through medium plate production line, which comprises: a main rolling line L, two parallel shearing lines C1 and C2, and straightening stacking lines S1 and S2 respectively arranged at the outer sides of the shearing lines C1 and C2 in parallel; one cutting line C1 in the cutting lines is directly arranged with the main rolling line L; wherein, the first and the second end of the pipe are connected with each other,
the main rolling line L includes: the method comprises the following steps of sequentially arranging a heating furnace 1, a high-pressure water descaling 2, a fixed width press 3, a vertical roll 4, a four-roll roughing mill 5, an intermediate cooling device 6, a four-roll finishing mill 7, an ACC (accelerated cooling) device 8, a hot straightener 9, a 1# marking device 10, a hot section shear 11, a 1# cooling bed 12, a 1# inspection bench 13, a 2# cooling bed 14 and a 2# inspection bench 15 which are respectively arranged at two sides of a steel rolling conveying roller way along the steel rolling conveying roller way;
each cutting line C1 (taking the cutting line C1 as an example, the same applies below) comprises a cutting roller way, and an ultrasonic flaw detector 16, a cutting head shear 17, a double-sided shear 18, a 2# marking device 19, a sizing shear 20, a 3# marking device 21 and a pre-stacker 22 are sequentially arranged along the cutting roller way; a plate turnover machine 23 is arranged between the shearing lines C1 and C2;
the straightening stacking line S1 (the straightening stacking line S1 is taken as an example, the same applies below) comprises a straightening conveying roller way, a cold straightening machine 24, a 4# marking device 25 and finished product collecting racks 26 and 26' arranged at two sides of the straightening conveying roller way, wherein the cold straightening machine 24 and the 4# marking device 25 are sequentially arranged along the straightening conveying roller way;
a traverse table 27 is provided between the shear line C1 and the straightening stacking line S1.
Preferably, the heating furnace 1 is provided with at least three units, and a deburring machine 28 and a weighing machine 29 are sequentially arranged along a roller way of the heating furnace; preferably, the heating furnace roller way and the continuous casting roller way are directly communicated.
Referring to fig. 3 and 4, the 1# cooling bed 12 is disposed at one side of the steel rolling roller way before the hot section shears 11, that is, the 1# cooling bed 12 and the 1# inspection bench 13 are separately disposed, and a part of steel plates to be stacked and cooled can be directly located at an open space between the 1# inspection bench and the 1# cooling bed, and a natural heat preservation stacking and cooling area can be formed by the 1# cooling bed and the 1# inspection bench, which is more favorable for improving the stacking and cooling effect of the steel plates; in addition, the arrangement is also favorable for relieving logistics at the joint of cold bed steel rolling and finishing line, has larger steel plate buffer area and is favorable for exerting productivity.
Preferably, a slab warehouse is arranged on one side of the heating furnace, and the slab warehouse and the heating furnace are provided with an operating room; and an operation chamber is arranged from the four-roller roughing mill to the ACC accelerated cooling device in the main rolling line.
Preferably, a plurality of operation chambers capable of simultaneously controlling corresponding equipment of the two shearing lines are arranged between the two shearing lines which are arranged in parallel; wherein, an operation room is arranged corresponding to the hot straightening machine, the cold bed, the inspection bench, the ultrasonic flaw detection and the crop shear; an operation chamber is arranged corresponding to the double-sided scissors; an operation room is arranged corresponding to the fixed-length shears, the check points and the pre-stacking machine.
The invention relates to a high-efficiency method for producing a medium plate by a double-rack double-shearing-line direct-connection medium plate production line, which comprises the following steps:
1) Directly sending the continuous casting plate blank to a heating furnace roller way in front of a heating furnace on line at the highest temperature through a continuous casting roller way, and deburring and weighing the continuous casting plate blank;
2) Weighing the continuous casting plate blank, and then loading the continuous casting plate blank into a heating furnace for heating according to a furnace loading plan;
3) After the continuous casting slab is heated to a target temperature, tapping steel enters a steel rolling conveying roller way of a main rolling line, and surface treatment is carried out through high-pressure water dephosphorization equipment to remove iron oxide scales on the surface of the continuous casting slab;
4) The continuous casting plate blank after the phosphorus removal by the high-pressure water reaches a fixed-width press machine to carry out on-line width adjustment so as to reach the required width before the vertical rolling mill; then the continuous cast slab reaches a vertical roll, and the planar shape, the head shape, the tail shape and the edge shape of the continuous cast slab are adjusted through the vertical roll so as to obtain good width dimension precision of a steel plate;
5) Rolling the continuous casting plate blank taken out of the vertical roller mill to a four-roller roughing mill to perform intermediate blank rolling, rolling the continuous casting plate blank to a set thickness and width, and rolling a finished product in a single stand under emergency conditions; the steel plate is not subjected to widening rolling;
6) After the rough-rolled plate blank reaches a four-roller finishing mill, rolling the plate blank into the required width and thickness of the steel plate according to the set times, the steel biting speed and the rolling reduction parameters, obtaining good plate shape and same plate difference, and simultaneously realizing the final rolling temperature of the steel plate with different temperature control requirements;
7) After the steel plate is rolled, the steel plate passes through an ACC accelerated cooling device according to whether a cooling control requirement exists or not, if the cooling requirement exists, the steel plate is cooled on line according to parameters such as cooling speed, flow, passing speed and the like set by a model to reach a target final cooling temperature, and therefore the mechanical property of the steel plate is improved; for the steel plate without the controlled cooling requirement, the steel plate directly passes through the ACC accelerated cooling device;
8) After passing through a cooling device, the steel plate passes through a hot straightening machine by a one-pass straightening process to improve the shape of the steel plate; if the rolled plate shape is poor, straightening passes can be increased;
9) After the steel plate is subjected to hot straightening, carrying out middle process marking on the steel plate at a No. 1 marking device so as to facilitate the middle process tracing of the steel plate;
10 The marked steel plate is rolled at a hot section shear for section so as to meet the requirement of the maximum length of the upper cooling bed; after the segmentation, different cooling beds can be selected for cooling the steel plate according to the logistics situation; the steel plate needing to be directly connected can directly enter a shearing roller way of a shearing line from a conveying roller way without going on a cooling bed;
11 The steel plate enters one of the two inspection benches for inspection after being cooled and is transported to a shearing roller way of a shearing line;
12 After passing through the inspection bench, the temperature of the steel plate is reduced to be below 80 ℃, the steel plate enters a flaw detection device to carry out flaw detection operation according to different flaw detection requirements, and the steel plate which does not need flaw detection directly passes through the flaw detection device;
13 The steel plate enters a head cutting shear to cut the head and the tail after flaw detection is finished, the tongue-shaped part of the head is cut off, the length of the tongue-shaped part is segmented to be larger than 30m, and the length of the segment is adjusted according to the length of a roller way; the steel plates are segmented to prepare for later edge shearing; if the tail part of the steel plate is in a bad shape, the tail cutting treatment is required;
14 The steel plate enters the bilateral scissors after the head and the tail of the steel plate are cut off, the burrs on the two sides of the steel plate are cut off, and the position of a movable scissors of the bilateral scissors is preset according to the width of a cut finished product;
15 After the bilateral shearing is finished, the steel plate is subjected to sample spray printing in the marking device, and if the steel plate has no sample, the steel plate passes through the marking device in an empty way;
16 The steel plate passes through a marking device and enters a fixed-length shear, and the fixed-length shear shears shear the steel plate into the length required by the final contract; simultaneously, sampling steel plates with samples, taking the large samples, sending the large samples to a sample shear, and carrying out the next processing and performance test;
17 ) after the steel plate finished product is cut, feeding the steel plate finished product into a jet printing machine for jet printing of the finished product, and jet printing contract information, steel grades, classification society marks and flaw detection requirement information on the steel plate; if the shape of the steel plate is not good, only spraying the plate number, and then, passing through the transverse moving rack to perform cold correction spraying; if the plate turnover is needed, the plate turnover machine is transversely moved to the plate turnover machine for plate turnover inspection;
18 The steel plate enters a final checking point of a product after spray printing is finished, and is checked, and if the steel plate is checked to have no problem, the steel plate directly passes through a pre-stacker and then is stored in a warehouse through a roller way; if the shape of the steel plate has a problem, respectively entering a cold straightening machine through a transverse moving rack for correcting the shape of the steel plate, and marking the steel plate by a marking device after the steel plate is corrected; and after marking is finished, the finished products enter a finished product warehouse through a conveying roller way, enter a finished product warehouse stacking position through a finished product collecting rack respectively according to stacking requirements, and wait for delivery.
Preferably, after the step 5), if the plate blank has the requirements of temperature control and finish rolling, water spraying cooling is carried out through an intermediate cooling device after rough rolling, and the plate blank temperature control functions with different requirements can be realized according to flow and speed parameters calculated by a cooling model; and part of the plate blank without temperature control requirement directly passes through the intermediate cooling device.
Examples
1) The Q345qD plate blank with the thickness of 250mm, the width of 2200mm and the length of 8000mm and the weight of 34.54t is conveyed to a roller way of a thick plate heating furnace from a continuous casting roller way, and is loaded into a No. 1 heating furnace for heating after being processed by a deburring machine, wherein the loading temperature of a steel plate is 600 ℃, the target heating temperature is 1080 ℃, and the actual performance tapping temperature of the steel plate is 1085 ℃;
2) The phosphorus removal pressure reaches 210bar, the phosphorus removal speed is 1.2m/s, and the water consumption of each group of nozzles is 290m 3/ h；
3) The steel plate passes through a fixed width press machine, and the side pressure is adjusted to be 50mm wide;
4) Rolling by using a vertical roller: 1-pass vertical roll rolling is carried out, the rolling force is 100 tons, and the rolling speed is 2m/s;
5) Rolling by a roughing mill: the temperature of the steel plate is measured at the rough rolling inlet and is 1030 ℃, the steel plate is rolled by 250mm for 9 times, the handover thickness is 76mm, the rolling speed is 2m/s, the maximum rolling force is 6300 tons, and the maximum torque is 3000 kilo-Nm;
6) Intermediate cooling: cooling the steel plate to 880 ℃ by intermediate cooling, and transferring to a finishing mill for rolling;
7) Rolling by a finishing mill: the temperature of the steel plate is measured at the inlet of a finishing mill, the steel plate is initially rolled at 880 ℃, the steel plate is rolled for 9 times, wherein the steel plate is loaded for 8 times, the steel plate is idle in the last time, the rolling speed of the first 6 times is 7m/s, the rolling speed of the last time is 4m/s, the maximum rolling reduction is 20mm, the rolling reduction of the last loaded time is 10%, and the final rolling temperature of the steel plate is 780 ℃; rolling size of the steel plate: 20, 2150, 102300mm, and transferring ACC for cooling after rolling is finished;
8) ACC cooling process, wherein the cooling speed is 15 ℃/s, the start cooling temperature is 780 ℃, the end cooling temperature is 540 ℃, and the steel plate enters a hot straightening machine for straightening after being cooled;
9) The hot straightening process comprises one straightening pass, wherein the straightening force is 300 tons, the roll gap is 19.5mm, and the straightening speed is 2.5m/s;
10 Spray printing, namely spray printing the plate number position 29A01130000 of the current day on a steel plate in a hot straightening machine to represent the 130 th large plate in 2019, 10 months and 1 days;
11 The steel plates are segmented by hot segmentation shears, the lengths of the two segmented steel plates are 48m and 47.6m respectively, and the two steel plates enter a No. 1 cooling bed and a No. 2 cooling bed respectively;
12 The two daughter boards respectively pass through a 1# rack and a 2# rack for inspection by transverse moving of a cooling bed, the temperature is reduced to be below 80 ℃, and then flaw detection is carried out by a 1# flaw detection device and a 2# flaw detection device, wherein the flaw detection speed is 0.3-1 m/s;
13 After the flaw detection is finished, cutting off the head and tail fillets of the steel plate after the steel plate reaches the positions of the 1# head cutting scissors and the 2# head cutting scissors, and performing rough cutting, wherein 4 steel plates are generated after the rough cutting, and the length of each steel plate is 23500mm (steel plate 1), 23500mm (steel plate 2), 23000mm (steel plate 3) and 29000mm (steel plate 4);
14 The steel plates after being segmented enter a No. 1 double-edge shear 10 and a No. 2 double-edge shear for edge shearing, the shearing blade gap is set to be 2.0mm, shearing frequency of maximum 30 times per minute and shearing step length of 1,300mm/1050mm are carried out, the trimming amount of two edges of the sheared steel plates is slightly different according to the camber condition of the steel plates, the widths of 4 steel plates after shearing are 2051mm, 2049mm, 2050mm and 2050mm, and the subsequent steel plates pass through a sample jet printing machine;
15 Steel plates are marked with sample numbers by a No. 3 marking device, and the rest steel plates pass through a sample spray printing machine in an empty state;
16 1# fixed length shear and 2# fixed length shear are respectively 14500mm, 9000mm, 12500mm, 11000mm, 12000mm and 16880mm according to the contract length, 1 large sample is taken, the length is 120mm, and the sample is sent to a processing operation room for small sample processing and performance test is carried out;
17 The steel plates enter a No. 4 marking device or a No. 5 marking device after being sized to perform finished product jet printing, and information such as contract size, steel plate number, weight, flaw detection requirements, classification society marks and the like is jet printed on the steel plates, wherein the steel plates 1 and 2 pass through the marking device due to plate shape problems;
18 6 small plates are inspected, have no problem on the surface, the appearance and spray printing, and are stacked by a No. 1 pre-stacker and a No. 2 pre-stacker and then are put in storage and stacked by a No. 3 finished product collecting rack and a No. 5 finished product collecting rack respectively; wherein 2 poor plates are sent to a 1# straightener and a 2# straightener through 1# and 3# traversing racks for plate shape correction;
19 2) finishing the final product spray printing in the 6# and 7# marking devices after finishing straightening the poor steel plates in a plate shape, and then entering a product warehouse for stacking through 4# and 6# product collecting racks.
Claims (5)
1. The utility model provides a two straight cut line cut plate production line of double racks of efficient which characterized in that includes: the main rolling line is provided with at least two shearing lines which are arranged in parallel, and the straightening stacking lines are respectively arranged outside each shearing line in parallel; one of the shearing lines is arranged in direct communication with the main rolling line; wherein the content of the first and second substances,
the main rolling line comprises: the method comprises the following steps of sequentially arranging a heating furnace, a high-pressure water descaling and constant-width press, vertical rolls, a four-roll roughing mill, an intermediate cooling device, a four-roll finishing mill, an ACC accelerated cooling device, a hot straightener, a 1# marking device, a hot section shear, a 1# cooling bed and a 2# cooling bed which are respectively arranged on two sides of a steel rolling conveying roller way, and a 1# inspection rack and a 2# inspection rack which are respectively arranged on two sides of the steel rolling conveying roller way; arranging hot section shears in front of the No. 1 and No. 2 cooling beds, and increasing the rolling length to more than 100 m;
the heating furnace roller way is directly communicated with the continuous casting roller way;
one of the shearing lines is directly arranged with the main rolling line steel rolling conveying roller bed; each shearing line comprises a shearing conveying roller way, and an ultrasonic flaw detection device, a head cutting shear, a double-sided shear, a 2# marking device, a fixed-length shear, a 3# marking device and a pre-stacker are sequentially arranged along the shearing conveying roller way; a plate turnover machine is arranged between the shearing lines;
the straightening stacking line comprises a straightening conveying roller way, a cold straightening machine, a 4# marking device and finished product collecting racks arranged on two sides of the straightening conveying roller way, wherein the cold straightening machine, the 4# marking device and the finished product collecting racks are sequentially arranged along the straightening conveying roller way;
a transverse moving rack is arranged between the shearing line and the straightening stacking line;
the two shearing lines are respectively arranged in the two plant spans, and a plurality of operation rooms capable of simultaneously controlling corresponding equipment of the two shearing lines are arranged between the two parallel shearing lines; wherein, an operation room is arranged corresponding to the hot straightening machine, the cooling bed, the inspection bench, the ultrasonic flaw detection and the crop shear; an operation chamber is arranged corresponding to the double-sided scissors; an operation chamber is arranged corresponding to the fixed-length shears and the pre-stacking machine.
2. The efficient double-frame double-shear-line straight-through medium plate production line as claimed in claim 1, wherein the # 1 cold bed is disposed on one side of a steel rolling rollgang before the hot-section shears.
3. The efficient double-rack double-shear-line straight-through medium plate production line as claimed in claim 1, wherein the heating furnace is provided with at least three units, and the deburring machine and the weighing machine are sequentially arranged along a roller way of the heating furnace.
4. The efficient double-rack double-shear-line straight-through medium plate production line as claimed in claim 1, wherein a slab warehouse is arranged on one side of the heating furnace, and the slab warehouse and the heating furnace are provided with an operation chamber; and an operation chamber is arranged from the four-roller roughing mill to the ACC accelerated cooling device in the main rolling line.
5. The efficient double-rack double-shear-line straight-through medium plate production line as claimed in claim 1 or 2, wherein the 1# cooling bed and the 1# inspection bench extend to a third factory bay.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910942697.7A CN112570449B (en) | 2019-09-30 | 2019-09-30 | Efficient double-rack double-shear-line straight-through medium plate production line and production method |
| US17/763,945 US20220339684A1 (en) | 2019-09-30 | 2020-09-29 | High-efficiency double-frame double-cutting line feed-through intermediate thickness slab production line and production method |
| KR1020227014540A KR20220102135A (en) | 2019-09-30 | 2020-09-29 | High-efficiency double-stand double-cutting line direct medium-thick plate production line and production method |
| PCT/CN2020/118929 WO2021063364A1 (en) | 2019-09-30 | 2020-09-29 | High-efficiency double-frame double-cutting line feed-through intermediate thickness slab production line and production method |
| JP2022518824A JP7308358B2 (en) | 2019-09-30 | 2020-09-29 | Thick and medium plate production line and production method directly connected to an efficient two-stand double cutting line |
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| CN201910942697.7A CN112570449B (en) | 2019-09-30 | 2019-09-30 | Efficient double-rack double-shear-line straight-through medium plate production line and production method |
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| CN112570449A CN112570449A (en) | 2021-03-30 |
| CN112570449B true CN112570449B (en) | 2022-12-20 |
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| US (1) | US20220339684A1 (en) |
| JP (1) | JP7308358B2 (en) |
| KR (1) | KR20220102135A (en) |
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| JP7457843B2 (en) | 2020-08-17 | 2024-03-28 | 山東鋼鉄股▲分▼有限公司 | Steel plate for polar marine construction and its manufacturing method |
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| CN113523022A (en) * | 2021-06-17 | 2021-10-22 | 南京钢铁股份有限公司 | Solution method for warping buckle head of rolled piece with thickness of more than 18mm of medium plate straightener |
| CN113770176B (en) * | 2021-06-29 | 2024-05-14 | 张家港宏昌钢板有限公司 | Visual material tracking method and system for online identification of flaw detection plate and representative plate |
| CN114774672B (en) * | 2022-05-12 | 2024-01-09 | 广东韶钢松山股份有限公司 | Billet charging control method and system |
| CN114888083A (en) * | 2022-06-25 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Method for rolling wide thin plate by medium plate mill |
| CN116167396A (en) * | 2023-01-09 | 2023-05-26 | 太原重工股份有限公司 | Material tracking method for straight welded pipe |
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| JPS57100806A (en) * | 1980-12-16 | 1982-06-23 | Nippon Kokan Kk <Nkk> | Producing device for seamless steel pipe |
| JPS6056562B2 (en) * | 1982-10-14 | 1985-12-11 | 石川島播磨重工業株式会社 | Plate rolling equipment |
| JPH0796163B2 (en) * | 1991-02-27 | 1995-10-18 | 川崎製鉄株式会社 | How to select and use shearing equipment for thick steel plates |
| DE19513999C2 (en) * | 1995-04-13 | 1999-07-29 | Sundwig Gmbh | Production line and its use for the production of steel strip |
| JP3399381B2 (en) | 1998-11-30 | 2003-04-21 | 株式会社日立製作所 | Hot rolling equipment with shearing machine |
| DE10047044A1 (en) * | 2000-09-22 | 2002-04-25 | Sms Demag Ag | Processes and plants for the production of steel strips and sheets |
| JP3418739B2 (en) | 2000-09-29 | 2003-06-23 | 川崎重工業株式会社 | Continuous casting hot rolling equipment and continuous casting hot rolling method |
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| CN100374218C (en) * | 2005-12-09 | 2008-03-12 | 广东韶钢松山股份有限公司 | Medium-thick plate production process |
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| KR101630911B1 (en) * | 2013-12-26 | 2016-06-15 | 주식회사 포스코 | continuous casting and rolling method |
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2019
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- 2020-09-29 US US17/763,945 patent/US20220339684A1/en active Pending
- 2020-09-29 WO PCT/CN2020/118929 patent/WO2021063364A1/en active Application Filing
- 2020-09-29 JP JP2022518824A patent/JP7308358B2/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7457843B2 (en) | 2020-08-17 | 2024-03-28 | 山東鋼鉄股▲分▼有限公司 | Steel plate for polar marine construction and its manufacturing method |
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| WO2021063364A1 (en) | 2021-04-08 |
| CN112570449A (en) | 2021-03-30 |
| JP2022549653A (en) | 2022-11-28 |
| JP7308358B2 (en) | 2023-07-13 |
| KR20220102135A (en) | 2022-07-19 |
| US20220339684A1 (en) | 2022-10-27 |
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