Slab rotation and centering control method

Abstract

The invention discloses a slab rotation and centering control method, which comprises the following steps that: at least two cross beams which move in a direction perpendicular to the rolling direction are arranged at the bottoms of steel rotating roller ways in front of and behind a rolling mill, and the cross beams can move up and down; after the plate blank enters the steel rotating roller way, a side guide plate is adopted for centering the plate blank; after centering of the plate blank is completed, at least two steel rotating cross beams are determined in the cross beams according to the physical parameters of the plate blank to conduct steel rotating on the plate blank; the physical parameters at least comprise size parameters of the plate blank; when steel rotating is conducted on the plate blank, the steel rotating cross beam is lifted upwards to support the plate blank, then the steel rotating cross beam is controlled to move by a preset distance in the direction perpendicular to the rolling direction, and therefore the plate blank is driven to rotate by a target angle. Large-angle angular rolling steel rotating can be achieved, meanwhile, the production efficiency of angular rolling broadening and transverse rolling broadening is improved, and the product quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling processes, and particularly to a method for controlling the rotation and centering of slab. Background Art

[0002] At present, with the rapid economic development, the demand for heavy plates with large specifications (ultra-wide, ultra-thick, extra-long) is increasing day by day. Among them, the production of heavy plates with large specifications mainly adopts the cross rolling (width spreading) + longitudinal rolling technology and the angle rolling - longitudinal rolling technology to adjust the width and length of the heavy plates.

[0003] The cross rolling (width spreading) + longitudinal rolling technology is the most widely used width spreading process for heavy plates at present. First, the slab is rotated 90 degrees, then spread to the required width and rotated 90 degrees again, and finally longitudinally rolled until completion, as Figure 1 shown. In this width spreading process, a steel rotating roller table is required to rotate the steel plate (slab 1) by 90 degrees and center it, which reduces the production efficiency of heavy plates.

[0004] Angle rolling - longitudinal rolling method: a method in which the rolled piece is fed into the rolling rolls at a certain angle with the rolling center line, as shown in Figure 2 . Angle rolling can achieve the width spreading rolling of the long slab 1, improve the biting condition, is beneficial to equipment maintenance, and increases the service life of the equipment.

[0005] At present, the width rolling process in domestic heavy plate mills mainly uses the cross rolling (width spreading) + longitudinal rolling technology, and a small number of steel mills adopt the angle rolling width spreading control technology. The existing methods for rotating steel mainly include the following several kinds:

[0006] 1). The method of pushing bed width fixing and steel rotating. According to the slab size and the target steel rotating angle, the width of the pushing bed is calculated by using the trigonometric function method, and the steel rotating roller table is used to rotate the slab until the slab rotates 90° or two diagonals contact the pushing bed. The main advantages of this scheme are: no large-scale transformation is required, and the steel rotating operation can be completed by using the existing equipment, and the slab can be directly centered through the side guide plate. The disadvantages of this scheme include: the steel rotating time of the slab is long, the efficiency is low, and the control accuracy of the steel rotating angle of the slab is not high.

[0007] 2). In the patent "Method for Rotating and Centering Control of Angle-Rolled Slab", 2 - 3 side push rods are respectively installed on both sides of the pushing bed, and the advancing amounts of the two side push rods are calculated by using the trigonometric function method according to the slab size and the target steel rotating angle. The main advantages of this scheme are: the transformation scale is small, the investment is small, and the slab can be centered through the side guide plate. The disadvantages of this scheme include: when the advancing amount of the push rod is large, the requirements for the equipment are high, and it is difficult to realize large-angle steel rotation or cross rolling width spreading steel rotation.

[0008] 3) In the patent "Rolling Mill Area Production Equipment and Hot Rolling Production Line with Push Plate Angle Adjustable Push Bed", the advancement of the two push rods of the side guide plate can be adjusted according to the requirements of the steel turning angle to achieve the steel turning requirements. The main advantages of this solution are: high steel turning efficiency and high control accuracy. The disadvantages of this solution include: equipment modification is required, the method of slab centering needs to be studied, and it is difficult to achieve large-angle steel turning or cross-rolling wide-width steel turning.

[0009] 4) In the patent "Rolling Mill Area Production Equipment and Hot Rolling Production Line with Rotating Clamps", the rotation angle of the rotating clamps can be adjusted according to the requirements of the steel turning angle to achieve the steel turning requirements. The main advantages of this solution are: high steel turning efficiency, high control accuracy, and large-angle steel turning or cross-rolling wide-width steel turning can be achieved. The main disadvantages of this solution include: a large amount of equipment modification, high investment, and the method of slab centering needs to be studied.

[0010] Therefore, it is necessary to propose a control method for slab rotation and centering to solve at least one of the above problems. Summary of the Invention

[0011] In view of the defects existing in the prior art, in an embodiment of the present invention, a control method for slab rotation and centering is provided, which can achieve large-angle angular rolling steel turning, improve the production efficiency of angular rolling wide-width and cross-rolling wide-width, and ensure product quality.

[0012] The specific technical solution of the embodiment of the present invention is as follows:

[0013] A control method for slab rotation and centering, the control method for slab rotation and centering includes:

[0014] Install at least two crossbeams that move perpendicular to the rolling direction at the bottom of the steel turning roller table before and after the rolling mill, and the crossbeams can move up and down;

[0015] After the slab enters the steel turning roller table, use a side guide plate to center the slab;

[0016] After centering the slab, determine at least two steel turning crossbeams in the crossbeams to turn the slab according to the physical parameters of the slab; the physical parameters at least include the size parameters of the slab;

[0017] When turning the slab, first lift the steel turning crossbeam upward to lift the slab, and then control the steel turning crossbeam to move a predetermined distance perpendicular to the rolling direction, thereby driving the slab to rotate the target angle.

[0018] In a preferred embodiment, when the target angle is an acute angle, the control method for slab rotation and centering further includes: when driving the slab to rotate by the target angle, positioning is performed through the side guide plates, so that after two diagonals of the slab contact the side guide plates, the target angle is reached.

[0019] In a preferred embodiment, when centering the slab using the side guide plates, the distance D0 between the side guide plates satisfies the following relational expression:

[0020] D0 = B×cos(a) + L×sin(a)

[0021] In the above formula, a represents the target angle that the slab needs to rotate, L represents the length of the slab, and B represents the width of the slab.

[0022] In a preferred embodiment, determining at least two steel-rotating crossbeams in the crossbeam according to the physical parameters of the slab for steel rotation of the slab includes:

[0023] Selecting two crossbeams with a distance less than the length of the slab, subtracting the distance between the two crossbeams from the length of the slab to obtain a difference of Δd, and calculating and checking in sequence from the two crossbeams with the farthest distance to the two crossbeams with the closest distance:

[0024] Δd = L - (S 12 + S 23 + … + S [n-1,n] ), …, Δd = L - (S 12 + S 23 ), Δd = L - S 12 ;

[0025] Among them, S 12 , S 23 , S [n-1,n] represent the distances between adjacent two crossbeams, Δd represents the length of the slab - the distance between the two crossbeams, and L represents the length of the slab;

[0026] When Δd is greater than zero, the current two crossbeams are preliminarily determined as steel-rotating crossbeams; after calculating the target rotation angle a of the slab, the projection of the slab length on the rolling center line: LR = L×cos(a);

[0027] When LR is also greater than the distance between the two crossbeams, two steel-rotating crossbeams are determined.

[0028] In a preferred embodiment, the physical parameters further include the weight parameter of the slab. When the weight of the slab is greater than a preset weight, an auxiliary steel-rotating crossbeam is added between the two steel-rotating crossbeams.

[0029] In a preferred embodiment, the two rotating steel crossbeams move a predetermined distance FW1 and FWn respectively along a direction perpendicular to the rolling direction, and FW1 and FWn satisfy the following relational expression:

[0030] FW 1 = FW n = [tan(a) × (S 12 + S 23 + … + S [n-1,n] ) – (D 0 - B / cos(a))] / 2.0

[0031] In the above formula, a represents the target angle by which the slab needs to rotate, L represents the length of the slab, B represents the width of the slab, D0 represents the distance between the side guide plates, and S 12 , S 23 , S [n-1,n] represent the distances between adjacent crossbeams.

[0032] In a preferred embodiment, when the target angle is 90°,

[0033] During the transverse rolling and spreading process, the slab rotates 90° and enters the rolling mill for spreading rolling;

[0034] After the slab spreads to the target width, the slab is rotated 90° in the reverse direction for elongation rolling.

[0035] In a preferred embodiment, after the slab rotates 90°, the control method further includes: using side guide plates to center the slab so that the center of the slab is located on the rolling center line.

[0036] In a preferred embodiment, determining at least two rotating steel crossbeams in the crossbeams to rotate the slab according to the physical parameters of the slab includes:

[0037] Select two crossbeams with a spacing less than the length of the slab. First, check the relationship between the spacing of the rotating steel crossbeams and the length of the slab: subtract the spacing between the two crossbeams from the length of the slab to obtain a difference Δdl, and find the two crossbeams when Δdl is greater than zero and the smallest as the first rotating steel crossbeams, and the numbers of the first rotating steel crossbeams are 1 and nl respectively;

[0038] Δdl = L - (S 12 + S 23 + … + S [n-1,n] ), …, Δdl = L - (S 12 + S 23 ), Δdl = L - S 12

[0039] wherein, S 12 , S23 、S [n-1,n] represents the distance between two adjacent crossbeams, and L represents the length of the slab;

[0040] Then check the relationship between the distance between the crossbeams for rotating the steel and the width of the slab: Subtract the distance between two crossbeams from the width of the slab to obtain a difference value of Δdw. Find two crossbeams when Δdw is greater than zero and Δdw is the smallest as the second crossbeams for rotating the steel, and the numbers of the second crossbeams for rotating the steel are 1 and nw respectively;

[0041] Δdw = B - (S 12 + S 23 + … + S [n-1,n] ), …, Δdw = B - (S 12 + S 23 ), Δdw = B - S 12

[0042] wherein, S 12 、S 23 、S [n-1,n] represent the distance between two adjacent crossbeams, and B represents the width of the slab;

[0043] Determine two crossbeams for rotating the steel during the cross-rolling spread process according to the size relationship between the length and width of the slab.

[0044] In a preferred embodiment, when the length of the slab is greater than the width, use the second crossbeams for rotating the steel as the crossbeams for rotating the steel in the cross-rolling spread; when the length of the slab is less than the width, use the first crossbeams for rotating the steel as the crossbeams for rotating the steel in the cross-rolling spread. During the rotation process of the slab, the slab does not contact the side guide plate.

[0045] In a preferred embodiment, the crossbeams installed at the bottom of the steel-rotating roller table include a front crossbeam closest to the roller and a rear crossbeam farthest from the roller. The distance between the front crossbeam and the rear crossbeam is greater than the length of the slab. The crossbeams between the front crossbeam and the rear crossbeam are intermediate crossbeams. The distance between two adjacent intermediate crossbeams, the distance between the intermediate crossbeam and the front crossbeam, and the distance between the intermediate crossbeam and the rear crossbeam are greater than or equal to the distance of the steel-rotating roller table.

[0046] The technical solution of the present invention has the following remarkable beneficial effects:

[0047] The slab rotation and centering control method provided in the embodiment of the present invention is for the medium-thick plate angle-rolling spread process method and the cross-rolling spread process method. Using the slab rotation and centering control method provided in the embodiment of the present application can achieve large-angle angle-rolling steel rotation, especially cross-rolling steel rotation, while improving the production efficiency of angle-rolling spread and cross-rolling spread and ensuring product quality.

[0048] With reference to the following description and the accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited thereby in scope. Within the spirit and terms of the appended claims, the embodiments of the present invention include many variations, modifications, and equivalents. Features described and / or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Description of the Drawings

[0049] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the various components in the drawings are merely schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention.

[0050] Figure 1 It is a schematic diagram of a medium-thick plate cross-rolling spread process provided in the prior art;

[0051] Figure 2 It is a schematic diagram of a heavy plate angle-rolling spread process provided in the prior art;

[0052] Figure 3 It is a schematic diagram of the state during heavy plate angle-rolling provided in the prior art;

[0053] Figure 4 It is a flowchart of the steps of a method for controlling slab rotation and centering provided in an embodiment of the present application;

[0054] Figure 5 It is a schematic diagram of the state of a slab for large-angle steel turning provided in an embodiment of the present application;

[0055] Figure 6 It is a schematic diagram of the state of a slab for 90° steel turning provided in an embodiment of the present application.

[0056] Description of the Reference Numerals:

[0057] 1. Slab;

[0058] 2. Side guide plate;

[0059] 3. Pusher;

[0060] 4. Roller;

[0061] 5. Steel-turning cross beam. Detailed implementation manners

[0062] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications made by those skilled in the art to the present invention all fall within the scope defined by the appended claims of this application.

[0063] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art belonging to the technical field of this application. The terms used in the specification of this application herein are only for the purpose of describing specific implementation manners and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0065] Regarding the existing methods for rotating and centering control of angle-rolled slab, the inventor analyzes it as follows:

[0066] As Figure 3 shown, for a 4300mm heavy plate mill using the angle-rolling spreading process, when the steel-rotating angle is relatively large, the corner of the slab 1 reaches or exceeds the second position P2 of the rolling center line (the dotted line in the figure) from the first position P1, and the extension of the pusher 3 needs to reach more than 2500mm.

[0067] If the pusher steel-rotating method as Figure 1 or Figure 2 shown in the existing technology is adopted, it is necessary to open a hole in the side guide plate 2 so that the pusher 3 can smoothly extend to push the slab 1 to rotate. Affected by the steel-rotating roller table and the structure of the pusher bed, the diameter of the opened hole is not more than 100mm. The diameter of the pusher 3 disposed in this opened hole is generally about 80mm.

[0068] According to the principles of theoretical mechanics, the deflection of the head of the push rod 3 under different extension lengths can be calculated. For the large-angle steel turning, when the extension length of the push rod 3 is 3000 mm, the deflection is 30 mm. For the cross-rolling steel turning, when the extension length of the push rod 3 is 4000 mm, the deflection is 90 mm. Pushing the slab (20 - 30 tons) multiple times under this working condition will cause the push rod 3 to bend and fail. Therefore, for the scenarios with a relatively large steel turning angle as described above, when using the existing push rod 3 for steel turning, the deflection problem of the push rod 3 will inevitably occur, which easily leads to the bending failure of the push rod 3.

[0069] In the embodiments of the present application, a control method for slab rotation and centering is provided, which can achieve large-angle angular rolling steel turning, improve the production efficiency of angular rolling spread and cross-rolling spread, and ensure product quality.

[0070] Please refer comprehensively to Figures 4 to 6 , in the embodiments of the specification of the present application, a control method for slab rotation and centering is provided, and the control method for slab rotation and centering may include the following steps:

[0071] Step 10: Install at least 2 crossbeams that move perpendicular to the rolling direction at the bottom of the steel turning roller tables before and after the rolling mill, and the crossbeams can move up and down;

[0072] Step 12: When the slab enters the steel turning roller table, use side guide plates to center the slab;

[0073] Step 14: After completing the centering of the slab, determine at least two steel turning crossbeams in the crossbeams according to the physical parameters of the slab to turn the slab; the physical parameters at least include the dimensional parameters of the slab;

[0074] Step 16: When turning the slab, first lift the steel turning crossbeams upward to support the slab, and then control the steel turning crossbeams to move a predetermined distance along the direction perpendicular to the rolling direction, so as to drive the slab to rotate by a target angle.

[0075] In the present application, the propulsion device is changed from both sides of the pusher to between the roller table gaps, optimizing the way of slab rotation and centering.

[0076] When applying the control method for slab rotation and centering provided by the present application to rotate and center the slab, it may specifically include the following process:

[0077] After the slab is descaled, it runs onto the steel turning roller table.

[0078] The present invention installs at least 2 crossbeams that can move perpendicular to the rolling direction at the bottom of the steel turning roller tables before and after the rolling mill, and the crossbeams can move up and down.

[0079] Specifically, the crossbeam is placed between two steel turning rollers. When the slab moves to the target area, the crossbeam first moves vertically upward, and two or more crossbeams are used to lift the slab, and then moves horizontally to rotate the slab. The movement of the crossbeam can be achieved by using a propulsion device on the crossbeam.

[0080] After the slab enters the steel transfer roller, the side guide plate can be used for centering first, and then two or more beams can be selected to transfer the slab according to the physical parameters of the slab; the beam for transferring the slab is lifted upward to hold up the slab, and then the slab is rotated by moving the beam perpendicular to the rolling direction.

[0081] When the slab enters the steel roller table and is centered by the side guides, the side guides can be opened first so that the spacing between the side guides is larger than the size of the slab, and then the side guides are moved closer to the slab. When the side guides move to a specified position and clamp the slab, the slab can be centered.

[0082] For angle rolling, in order to achieve the rolling angle (target angle), the side guide plate can be used for positioning, so that the two corners of the slab contact the side guide plate to reach the target angle.

[0083] Wherein, the physical parameters of the slab at least include the size parameters of the slab. Wherein, when the slab is rectangular, the size parameters may include length parameters. Further, the size parameters may also include width parameters. In addition, the physical parameters may also include weight parameters. Specifically, when the weight of the slab is greater than the preset weight, an auxiliary steel-transfer beam is added between the two steel-transfer beams. By adding the auxiliary steel-transfer beam, it can cooperate with the two steel-transfer beams to share the weight of the slab, thereby ensuring the stability and reliability of each beam when rotating the slab.

[0084] Wherein, the crossbeam installed at the bottom of the steel transfer roller may include: a front crossbeam located closest to the roller and a rear crossbeam farthest from the roller, the distance between the front crossbeam and the rear crossbeam is greater than the length of the slab, the crossbeam located between the front crossbeam and the rear crossbeam is the middle crossbeam, and the distance between two adjacent middle crossbeams, the distance between the middle crossbeam and the front crossbeam, and the distance between the middle crossbeam and the rear crossbeam is greater than or equal to the distance of the steel transfer roller.

[0085] Before the slab is officially rotated, the slab's turning angle can be adjusted or horizontal rolling (90° turning) can be achieved by controlling the up and down lifting of the crossbeam and the lateral movement perpendicular to the rolling direction and calculating different advancement amounts according to process requirements.

[0086] Let the steel-rotating angle of a certain corner rolling pass be a, the length of the slab be L, and the width of the slab be B; the distances between adjacent two crossbeams be S12, S23, S34, S45…, the distance D0 between the side guide plates on both sides of the steel-rotating roller table, and the distance DR between adjacent two rollers of the steel-rotating roller table. Among them, the distance between two crossbeams is the largest, greater than the minimum length of the slab, and the distances between the remaining crossbeams are greater than or equal to the distance of the steel-rotating roller table. Take Figure 5 as an example.

[0087] When the distance between the second and the third crossbeams is the largest: S 12 = S 34 = … S [n-1,n] = DR, S 23 = 2×DR

[0088] When the distance between the first and the second crossbeams is the largest: S 23 = S 34 = … S [n-1,n] = DR, S 12 = 2×DR

[0089] Let the number of crossbeams for steel rotation be n (n≧2), and the maximum distance between crossbeams is greater than the maximum rolling width. It is necessary to set and calculate: the numbers and quantities of the crossbeams for steel rotation operation, and the transverse displacement of each crossbeam for steel rotation execution; let the transverse displacement of the first crossbeam be FW1, the transverse displacement of the second crossbeam be FW2, and so on FW3, FW4…. Among them, this transverse displacement is the advancing amount when the crossbeam is centered and the steel rotation is executed.

[0090] In the embodiment of the present application, after the slab 1 enters the steel-rotating roller table, the side guide plate 2 is used to center the slab 1. When the side guide plate 2 is used to center the slab 1, the distance D0 between the side guide plates 2 satisfies the following relational expression:

[0091] D0 = B×cos(a) + L×sin(a)

[0092] In the above formula, a represents the target angle that the slab 1 needs to rotate, L represents the length of the slab 1, and B represents the width of the slab 1. When the distance D0 between the side guide plates 2 satisfies the above relational expression, after the slab 1 rotates the target angle, the two butt joints of the slab 1 can just contact the side guide plate 2, and by using the constraint effect of the side guide plate 2 on the slab 1, the slab 1 can be efficiently and reliably centered along the center line of the rolling direction.

[0093] In some embodiments, determining at least two steel-rotating crossbeams in the crossbeams according to the physical parameters of the slab to rotate the steel for the slab may include:

[0094] Select two crossbeams with a spacing less than the length of the slab, subtract the spacing between the two crossbeams from the length of the slab to obtain a difference of Δd. Select the two crossbeams corresponding to when Δd is greater than zero and is the smallest, so as to find the two crossbeams with the spacing closest to the length of the slab. Since the larger the spacing between the crossbeams, the more stable the steel turning process. When using the two crossbeams with the spacing closest to the length of the slab as the steel turning crossbeams, the steel turning process can reach the most stable state.

[0095] When specifically selecting, it can be calculated and checked in turn from the two crossbeams with the farthest distance to the closest distance:

[0096] Δd = L - (S 12 + S 23 + … + S [n-1,n] ), …, Δd = L - (S 12 + S 23 ), Δd = L - S 12 ;

[0097] Among them, S 12 , S 23 , S [n-1,n] represent the spacing between adjacent two crossbeams, Δd represents the length of the slab - the spacing between two crossbeams, and L represents the length of the slab;

[0098] When Δd is greater than zero, preliminarily determine the current two crossbeams as the steel turning crossbeams; after calculating the projected length of the slab on the rolling center line after the slab rotates by the target angle a: LR = L × cos(a);

[0099] When the projected length of the slab on the rolling center line LR is also greater than the spacing between the two crossbeams, determine the two steel turning crossbeams. Among them, the two steel turning crossbeams move a predetermined distance FW1 and FWn respectively along the direction perpendicular to the rolling direction.

[0100] Since the steel turning operation is carried out around the center of the slab, so FW 1 = FW n , let the transverse displacement FW n of the nth steel turning crossbeam. Then along the steel turning crossbeam, the distance (FW n_min ) from the other side of the steel plate to the side guide plate is:

[0101] FW n_min = D 0 - B / cos(a) - FW n

[0102] That is: FW 1 – (D 0 - B / cos(a) - FW n ) = tan(a) × (S 12 + S 23 + … + S[n-1,n] )

[0103] FW 1 = FW n = [tan(a) × (S 12 + S 23 + … + S [n-1,n] ) – (D 0 - B / cos(a))] / 2.0

[0104] FW1 and FWn satisfy the following relational expression:

[0105] FW 1 = FW n = [tan(a) × (S 12 + S 23 + … + S [n-1,n] ) – (D 0 - B / cos(a))] / 2.0

[0106] In the above formula, a represents the target angle by which the slab needs to rotate, L represents the length of the slab, B represents the width of the slab, D0 represents the distance between the side guide plates, and S 12 , S 23 , S [n-1,n] represent the distances between two adjacent crossbeams.

[0107] Through the above calculations and checks, it can be ensured that during the entire steel rotation process, the steel rotation crossbeam can fully support the slab, and the situation where the slab is not stably supported or drops, thus affecting production, will not occur.

[0108] As Figure 6 shown, in one embodiment, when the steel rotation angle (target angle) is 90°, that is, when performing cross-rolling steel rotation, the control method for the rotation and centering of the slab 1 provided by the present application may include the following steps:

[0109] During the cross-rolling width spreading process, the slab rotates 90° and enters the rolling mill for width spreading rolling;

[0110] After the width of the slab 1 spreads to the target width, the slab 1 is rotated 90° in the reverse direction for elongation rolling. During the rotation of the slab 1, the slab 1 does not contact the side guide plate 2.

[0111] Among them, before the slab 1 rotates 90°, the side guide plate 2 can be fully opened so that the side guide plate 2 does not interfere with the rotation of the slab 1.

[0112] After the slab 1 rotates 90°, the control method further includes: using the side guide plate 2 to center the slab 1 so that the center of the slab 1 is located on the rolling center line.

[0113] In this embodiment, during the cross-rolling spread process, the slab 1 rotates 90° and enters the rolling mill for spread rolling until it spreads to the target width, and then rotates 90° in the reverse direction for elongation rolling. In order to ensure the symmetry of the rolling forces on both sides of the rolling mill, after the slab 1 rotates 90°, a side guide plate 2 is used for centering to ensure that the center of the steel plate is located on the rolling center line; the rolling direction positioning technology of the slab 1 is adopted to ensure that the center of the steel plate is located at the centers of two steel-rotating crossbeams 5.

[0114] In one embodiment, determining at least two steel-rotating crossbeams in the crossbeam for steel-rotating the slab according to the physical parameters of the slab includes:

[0115] Select two crossbeams with a spacing less than the length of the slab, and first check the relationship between the spacing of the steel-rotating crossbeams and the length of the slab: Subtract the spacing between the two crossbeams from the length of the slab to obtain a difference of Δdl, and find the two crossbeams when Δdl is greater than zero and the smallest as the first steel-rotating crossbeams, and the numbers of the first steel-rotating crossbeams are 1 and nl respectively;

[0116] Δdl = L - (S 12 + S 23 +…+ S [n-1,n] ), …, Δdl = L - (S 12 + S 23 ), Δdl = L - S 12

[0117] wherein, S 12 , S 23 , S [n-1,n] represent the spacing between two adjacent crossbeams, and L represents the length of the slab;

[0118] Then check the relationship between the spacing of the steel-rotating crossbeams and the width of the slab: Subtract the spacing between the two crossbeams from the width of the slab to obtain a difference of Δdw, and find the two crossbeams when Δdw is greater than zero and Δdw is the smallest as the second steel-rotating crossbeams, and the numbers of the second steel-rotating crossbeams are 1 and nw respectively;

[0119] Δdw = B - (S 12 + S 23 +…+ S [n-1,n] ), …, Δdw = B - (S 12 + S 23 ), Δdw = B - S 12

[0120] wherein, S 12 , S 23 , S [n-1,n] represent the spacing between two adjacent crossbeams, and B represents the width of the slab;

[0121] According to the relationship between the length and width of the slab, two steel-rotating crossbeams during the cross-rolling width spreading process are determined, so as to ensure that the slab can be reliably supported by the steel-rotating crossbeams during the cross-rolling width spreading process.

[0122] Specifically, when the length of the slab is greater than the width, the second steel-rotating crossbeam is used as the steel-rotating crossbeam for cross-rolling width spreading; when the length of the slab is less than the width, the first steel-rotating crossbeam is used as the steel-rotating crossbeam for cross-rolling width spreading.

[0123] In a specific scenario, crossbeams that can move up and down are adopted. During cross-rolling width spreading rolling, the steel-rotating control method and the selection of crossbeams are as follows:

[0124] First, select two crossbeams with a spacing less than the length of the slab. Among them: Δdl is the difference between (the length of the slab - the spacing between the two crossbeams). Find the two steel-rotating crossbeams when Δdl is greater than zero and the smallest, and obtain the crossbeam numbers as (1 and nl).

[0125] Δdl = L - (S 12 + S 23 +…+ S [n-1,n] ), …, Δdl = L - (S 12 + S 23 ), Δdl = L - S 12

[0126] Then, check the relationship between the spacing of the steel-rotating crossbeams and the width of the slab: Δdw is the difference between the width of the slab - the spacing between the two crossbeams. Find the two steel-rotating crossbeams when Δdw is greater than zero and Δdw is the smallest, and obtain the numbers (1 and nw);

[0127] Δdw = B - (S 12 + S 23 +…+ S [n-1,n] ), …, Δdw = B - (S 12 + S 23 ), Δdw = B - S 12

[0128] When the length of the rolled steel plate is greater than the width, the steel-rotating crossbeam numbers (1 and nl) are used as the steel-rotating crossbeams for cross-rolling width spreading. When the length of the rolled steel plate is less than the width, the steel-rotating crossbeam numbers (1 and nw) are used as the steel-rotating crossbeams for cross-rolling width spreading.

[0129] The slab rotation and centering control method provided in the embodiment of the present invention is for the medium-thick plate angle-rolling width spreading process method and the cross-rolling width spreading process method. Using the slab rotation and centering control method provided in the embodiment of the present application can achieve large-angle angle-rolling steel rotation, especially cross-rolling steel rotation, while improving the production efficiency of angle-rolling width spreading and cross-rolling width spreading and ensuring product quality.

[0130] It should be noted that in the description of the present application, terms such as "first" and "second" are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be construed as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0131] The above-described embodiments in this specification are all described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and each embodiment focuses on the differences from other embodiments.

[0132] The above are only several embodiments of the present invention. Although the disclosed embodiments of the present invention are as above, the content is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the present invention. Any person skilled in the art in the technical field to which the present invention pertains can make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A method for controlling slab rotation and centering, characterized in that: The control method for slab rotation and centering comprises: At least two crossbeams are installed at the bottom of the steel roller table before and after the rolling mill, which are movable perpendicular to the rolling direction, and the crossbeams can move up and down; When the slab enters the steel transfer roller, the slab is centered by using a side guide plate; After the slab is centered, at least two steel-transfer beams are determined in the beams to transfer steel to the slab according to the physical parameters of the slab; the physical parameters at least include the size parameters of the slab; When the slab is being rotated, the rotating beam is first lifted upward to hold up the slab, and then the rotating beam is controlled to move a predetermined distance perpendicular to the rolling direction, thereby driving the slab to rotate to a target angle.

2. The method for controlling slab rotation and centering according to claim 1, characterized in that: When the target angle is an acute angle, the control method for rotating and centering the slab further includes: when driving the slab to rotate to the target angle, positioning the slab through the side guide plate so that the target angle is reached after two diagonal corners of the slab contact the side guide plate.

3. The method for controlling slab rotation and centering according to claim 1, characterized in that: When the side guide plates are used to center the slab, the distance D0 between the side guide plates satisfies the following relationship: D0=B×cos(a)+L×sin(a) In the above formula, a represents the target angle of rotation of the slab, L represents the length of the slab, and B represents the width of the slab.

4. The method for controlling slab rotation and centering according to claim 3, characterized in that: Determining at least two steel-transfer beams in the beams according to the physical parameters of the slab to transfer steel to the slab comprises: Select two beams whose spacing is smaller than the length of the slab, and make a difference between the length of the slab and the spacing between the two beams to obtain a difference value of Δd. Calculate and check the two beams from the farthest distance to the closest distance in turn: Δd=L-(S 12 +S 23 +…+S [n-1,n] ),…,Δd=L-(S 12 +S 23 ),Δd=L-S 12 ; Among them, S 12 , S 23 , S [n-1,n] represents the distance between two adjacent beams, Δd represents the slab length minus the distance between two beams, and L represents the slab length; When Δd is greater than zero, the two current beams are preliminarily determined as steel transfer beams; after calculating the target angle a of the slab rotation, the projection of the slab length on the rolling center line is: LR = L × cos (a); When LR is also greater than the distance between two beams, two steel transfer beams are determined.

5. The method for controlling slab rotation and centering according to claim 4, characterized in that: The physical parameters also include weight parameters of the slab. When the weight of the slab is greater than a preset weight, an auxiliary steel-transfer beam is added between the two steel-transfer beams.

6. The method for controlling slab rotation and centering according to claim 4, characterized in that: The two steel-transfer beams move predetermined distances FW1 and FWn respectively along the direction perpendicular to the rolling direction, and FW1 and FWn satisfy the following relationship: FW1=FW n =[tan(a)×(S 12 +S 23 +…+S [n-1,n] )–(D0-B / cos(a))] / 2.0 In the above formula, a represents the target angle of rotation of the slab, L represents the length of the slab, B represents the width of the slab, D0 represents the distance between the side guide plates, S 12 , S 23 , S [n-1,n] Indicates the distance between two adjacent beams.

7. The method for controlling slab rotation and centering according to claim 6, characterized in that: When the target angle is 90°, During the cross-rolling width expansion process, the slab is rotated 90° and enters the rolling mill for width expansion rolling; After the slab is stretched to a target width, the slab is rotated in the opposite direction by 90° for stretch rolling. During the rotation of the slab, the slab does not contact the side guide plate.

8. The method for controlling slab rotation and centering according to claim 7, characterized in that: After the slab is rotated 90°, the control method further comprises: centering the slab using a side guide plate so that the center of the slab is located on the rolling center line.

9. The method for controlling slab rotation and centering according to claim 8, characterized in that: Determining at least two steel-transfer beams in the beams according to the physical parameters of the slab to transfer steel to the slab comprises: Select two beams whose spacing is smaller than the length of the slab, first check the relationship between the spacing of the steel transfer beams and the length of the slab: subtract the slab length from the spacing of the two beams to obtain a difference of Δdl, find two beams whose Δdl is greater than zero and the smallest as the first steel transfer beams, and the first steel transfer beams are numbered 1 and nl respectively; Δdl=L-(S 12 +S 23 +…+S [n-1,n] ),…,Δdl=L-(S 12 +S 23 ),Δdl=L-S 12 Among them, S 12 , S 23 , S [n-1,n] It represents the distance between two adjacent beams, and L represents the length of the slab; Then check the relationship between the spacing of the steel transfer beams and the width of the slab: subtract the width of the slab from the spacing of the two beams, and the difference is Δdw. Find the two beams with Δdw greater than zero and the smallest Δdw as the second steel transfer beams, and the second steel transfer beams are numbered 1 and nw respectively; Δdw=B-(S 12 +S 23 +…+S [n-1,n] ),…,Δdw=B-(S 12 +S 23 ),Δdw=B-S 12 Among them, S 12 , S 23 , S [n-1,n] It represents the distance between two adjacent beams, and B represents the width of the slab; According to the relationship between the length and width of the slab, two steel-transfer beams are determined during the cross-rolling and widening process.

10. The method for controlling slab rotation and centering according to claim 9, characterized in that: When the length of the slab is greater than the width, the second steel-transfer beam is used as the steel-transfer beam for horizontal rolling and width expansion; When the length of the slab is smaller than the width, the first steel-transfer beam is used as the steel-transfer beam for horizontal rolling and width expansion.

11. The method for controlling slab rotation and centering according to claim 1, characterized in that: The cross beams installed at the bottom of the steel turning roller include a front cross beam located closest to the roller and a rear cross beam farthest from the roller. The distance between the front cross beam and the rear cross beam is greater than the length of the slab. The cross beam located between the front cross beam and the rear cross beam is an intermediate cross beam. The distance between two adjacent intermediate cross beams, the distance between the intermediate cross beam and the front cross beam, and the distance between the intermediate cross beam and the rear cross beam are greater than or equal to the distance of the steel turning roller.

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