Slab rotation and centering control method

Abstract

The invention discloses a slab rotating and centering control method which comprises the following steps: at least two cross beams moving in a direction perpendicular to a rolling direction are mounted at the bottoms of steel rotating roller ways in front of and behind a rolling mill, at least one steel rotating propelling device capable of extending out of the steel rotating roller ways is mounted on each cross beam, and when the cross beams move, the steel rotating propelling devices can move along with the cross beams; after the plate blank enters the steel rotating roller way, centering the plate blank by adopting a side guide plate; 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, and steel rotating is conducted 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 propelling device on the steel rotating cross beam is used for driving the plate blank to rotate, and the steel rotating cross beam is controlled to move by a preset distance in the direction perpendicular to the rolling direction, so that the plate blank rotates 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 relates to a method for controlling the rotation and centering of a slab. Background Art

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

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

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

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

[0006] 1) The push bench width-fixing and steel-rotating method. According to the slab size and the target steel-rotating angle, the width of the push bench is calculated using the trigonometric function method, and the steel roller table is used to rotate the slab until the slab rotates 90° or both diagonals contact the push bench. The main advantages of this scheme are: no large-scale transformation is required, and the steel-rotating operation can be completed 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 Controlling the Rotation and Centering of Angle-Rolled Slabs", 2 - 3 side push rods are respectively installed on both sides of the push bench, and the advancing amounts of the two side push rods are calculated 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 achieve large-angle steel rotation or cross-rolling spread 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 pushing amount 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 requirements of steel turning. 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 and spreading steel turning.

[0009] 4) In the patent "Rolling Mill Area Production Equipment and Hot Rolling Production Line with Rotating Clamp", the rotation angle of the rotating clamp can be adjusted according to the requirements of the steel turning angle to achieve the requirements of steel turning. The main advantages of this solution are: high steel turning efficiency, high control accuracy, and large-angle steel turning or cross-rolling and spreading steel turning can be achieved. The main disadvantages of this solution include: large amount of equipment modification, large 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 and steel turning, and at the same time improve the production efficiency of angular rolling and spreading and cross-rolling and spreading, 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 2 cross beams that move perpendicular to the rolling direction at the bottom of the steel turning roller table before and after the rolling mill, and at least one steel turning propulsion device that can extend out of the steel turning roller table is installed on the cross beam. When the cross beam moves, the steel turning propulsion device can move along with the cross beam;

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

[0016] After the slab is centered, determine at least two steel turning cross beams in the cross beam according to the physical parameters of the slab, and perform steel turning on the slab; the physical parameters at least include the size parameters of the slab;

[0017] When performing steel turning on the slab, drive the slab to rotate by using the steel turning propulsion device on the steel turning cross beam, and by controlling the steel turning cross beam to move a predetermined distance perpendicular to the rolling direction, make the slab rotate to the target angle.

[0018] In a preferred embodiment, the steel turning and pushing device is installed on the cross beam by means of fixed connection, and the fixed connection method includes any one of the following: welding, forging, bolt connection.

[0019] In a preferred embodiment, among the at least two cross beams moving perpendicular to the rolling direction, there are two cross beams with a spacing greater than a first predetermined spacing, and the spacing of the remaining cross beams is a set of roller path spacings, and the first predetermined spacing is greater than the set of roller path spacings.

[0020] In a preferred embodiment, the first predetermined spacing is two sets of roller path spacings.

[0021] In a preferred embodiment, when the target angle is an acute angle, the control method for slab rotation and centering further includes: when rotating the slab by the target angle, positioning is performed through the side guide plates, and after the two diagonals of the slab contact the side guide plates, the target angle is reached.

[0022] In a preferred embodiment, when using the side guide plates to center the slab, the side guide plate spacing D0 satisfies the following relational expression:

[0023] D0 = B×cos(a) + L×sin(a)

[0024] In the above formula, a represents the target angle that the slab needs to rotate, L represents the slab length, and B represents the slab width.

[0025] In a preferred embodiment, determining at least two steel turning cross beams in the cross beam according to the physical parameters of the slab to turn the steel of the slab includes:

[0026] Selecting two cross beams with a spacing less than the slab length, subtracting the slab length from the spacing between the two cross beams to obtain a difference of Δd, and calculating and checking in sequence from the two cross beams with the farthest distance to the two cross beams with the closest distance:

[0027] Δd = L - (S 12 + S 23 + … + S [n-1,n] ), …, Δd = L - (S 12 + S 23 ), Δd = L - S 12 ;

[0028] Wherein, S 12 , S 23 , S [n-1,n] represent the spacing between adjacent two cross beams, Δd represents the slab length - the spacing between two cross beams, and L represents the slab length;

[0029] 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 is: LR = L×cos(a);

[0030] When LR is also greater than the distance between the two crossbeams, the two steel-rotating crossbeams are determined.

[0031] 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, auxiliary steel-rotating crossbeams are added between the two steel-rotating crossbeams.

[0032] In a preferred embodiment, the two steel-rotating crossbeams move a predetermined distance FW1 and FWn along a direction perpendicular to the rolling direction respectively, and FW1 and FWn satisfy the following relational expression:

[0033] FW 1 =FW n =[tan(a)×(S 12 +S 23 +…+S [n-1,n] )–(D 0 -B / cos(a))] / 2.0

[0034] In the above formula, a represents the target rotation angle required for the slab, L represents the slab length, B represents the slab width, D0 represents the distance between side guide plates, and S 12 、S 23 、S [n-1,n] represent the distances between adjacent crossbeams.

[0035] In a preferred embodiment, when the target angle is 90°,

[0036] During the cross-rolling width spreading process, the slab rotates 90° and enters the rolling mill for width spreading rolling;

[0037] After the width of the slab spreads to the target width, the slab is rotated 90° in the reverse direction for elongation rolling. During the rotation of the slab, the slab does not contact the side guide plates.

[0038] 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.

[0039] In a preferred embodiment, at least two steel-rotating crossbeams are determined in the crossbeams according to the physical parameters of the slab. The steel rotation of the slab includes:

[0040] Select two crossbeams with a spacing less than the length of the slab,

[0041] Check the relationship between the spacing of the steel-rotating crossbeams and the width of the slab: Subtract the spacing between two crossbeams from the width of the slab to obtain a difference value Δdw. Find two crossbeams when Δdw is less than zero and the absolute value of Δdw is the smallest as the steel-rotating crossbeams, and the numbers of the steel-rotating crossbeams are 1 and nw respectively;

[0042] Δdw = B - S 12 , Δdw = B - (S 12 +S 23 ), … Δdw = B - (S 12 +S 23 +…+S [n-1,n] )

[0043] wherein, S 12 , S 23 , S [n-1,n] represent the spacing between two adjacent crossbeams, and B represents the width of the slab. In a preferred embodiment, 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 by the target angle, positioning through the side guide plates, so that after two diagonals of the slab contact the side guide plates, the target angle is reached.

[0044] The technical solution of the present invention has the following remarkable beneficial effects:

[0045] The control method for rotating and centering the slab provided in the embodiment of the present invention is for the medium-thick plate angle rolling width expansion process method and the cross rolling width expansion process method. Using the control method for rotating and centering the slab 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 expansion and cross rolling width expansion and ensuring product quality.

[0046] Referring to the following description and the drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. 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 changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in the same or similar way in one or more other embodiments, combined with features in other embodiments, or replace features in other embodiments. Description of the Drawings

[0047] The accompanying 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 only schematic and are used to assist in the understanding of 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.

[0048] Figure 1 It is a schematic diagram of a medium-thick plate cross-rolling spread process provided in the prior art;

[0049] Figure 2 It is a schematic diagram of a heavy plate angle-rolling spread process provided in the prior art;

[0050] Figure 3 It is a schematic diagram of the state during heavy plate angle-rolling provided in the prior art;

[0051] Figure 4 It is a flowchart of the steps of a method for controlling the rotation and centering of a slab provided in an embodiment of the present application;

[0052] 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;

[0053] Figure 6 It is another schematic diagram of the state of a slab for large-angle steel turning provided in an embodiment of the present application;

[0054] Figure 7 It is a schematic diagram of the state of a slab for 90° steel turning provided in an embodiment of the present application.

[0055] Explanation of reference numerals:

[0056] 1. Slab;

[0057] 2. Side guide plate;

[0058] 3. Pusher;

[0059] 4. Roller;

[0060] 5. Steel-turning cross beam;

[0061] 7. Steel-turning propulsion device. 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 fall within the scope defined by the appended claims of the present 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 can 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.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific implementations 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 controlling the rotation and centering of angle-rolled slab billets, the inventor analyzes it as follows:

[0066] As Figure 3 shown, for a 4300mm heavy plate rolling mill using the angle-rolling spread 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 method of pushing the steel by the pusher as shown in Figure 1 or Figure 2 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 opening is not more than 100mm. The diameter of the pusher 3 arranged in this opening is generally about 80mm.

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

[0069] An embodiment of this application provides a method for controlling the rotation and centering of a slab billet, which can achieve large-angle angle-rolling steel rotation, improve the production efficiency of angle-rolling spread and cross-rolling spread at the same time, and ensure product quality.

[0070] Please refer to comprehensivelyFigures 4 to 7 , in the embodiment of the specification of this application, a control method for slab rotation and centering is provided. The control method for slab rotation and centering may include the following steps:

[0071] Step 10: Install at least two crossbeams that move perpendicular to the rolling direction at the bottom of the steel-turning roller tables before and after the rolling mill. At least one steel-turning propulsion device that can extend out of the steel-turning roller table is installed on the crossbeams. When the crossbeams move, the steel-turning propulsion device can move along with the crossbeams;

[0072] Step 12: After 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, and turn the slab; the physical parameters at least include the dimensional parameters of the slab;

[0074] Step 16: When turning the slab, use the steel-turning propulsion device on the steel-turning crossbeam to drive the slab to rotate, and by controlling the steel-turning crossbeam to move a predetermined distance perpendicular to the rolling direction, make the slab rotate by a target angle.

[0075] In this 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 this 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] In the present invention, at least two crossbeams that can move perpendicular to the rolling direction are installed at the bottom of the steel-turning roller tables before and after the rolling mill. The crossbeams can move up and down (i.e., perpendicular to the rolling direction). At least one steel-turning propulsion device 7 that can extend out of the steel-turning roller table is installed on the crossbeams. When the crossbeams move, the steel-turning propulsion device 7 can move along with the crossbeams.

[0079] Specifically, the steel-turning propulsion device 7 can be installed on the crossbeam by a fixed connection method, and the fixed connection method includes any one of the following: welding, forging, bolt connection. Of course, the specific setting method of the steel-turning propulsion device 7 can also be other methods, not limited to the above description. Those skilled in the art may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should all be covered within the protection scope of this application.

[0080] Specifically, the cross beam is placed between two rotary steel roller tables. The slab 1 moves to the target area, and the cross beam (i.e., the rotary steel cross beam 5) supporting the slab moves laterally. When the cross beam moves, the rotary steel propulsion device 7 can move along with the rotary steel cross beam 5. When the rotary steel propulsion devices 7 on two rotary steel cross beams 5 move relative to each other, a torque can be applied to the slab 1, thereby driving the slab 1 to rotate. Among them, the movement of the rotary steel cross beam 5 can be realized by the propulsion device on the cross beam. Specifically, the form of the propulsion device used to drive the cross beam to move is not specifically limited in this application.

[0081] After the slab 1 enters the rotary steel roller table, it can first be centered by the side guide plate 2, and then according to the physical parameters of the slab 1, two or more cross beams are selected to perform rotary steel on the slab 1. The cross beam performing rotary steel on the slab 1 moves laterally, and then through the movement of the rotary steel cross beam 5 in the direction perpendicular to the rolling direction (i.e., the above-mentioned lateral movement), the rotation of the slab 1 is realized by using the rotary steel propulsion device 7.

[0082] When the slab enters the rotary steel roller table and is centered by the side guide plate, the side guide plate can be opened first so that the distance between the side guide plates is greater than the size of the slab, and then the side guide plates are moved closer to the slab. When the side guide plates move to the specified position and clamp the slab, the centering of the slab can be realized.

[0083] For corner rolling rotary steel, in order to achieve the rotary steel angle (target angle), positioning can be carried out with the help of the side guide plate. After two corners of the slab contact the side guide plate, the target angle is reached.

[0084] Among them, the physical parameters of the slab at least include the size parameters of the slab. Among them, when the slab is rectangular, the size parameters can include the length parameter. Further, the size parameters can also include the width parameter. In addition, the physical parameters can also include the weight parameter. Specifically, when the weight of the slab is greater than the preset weight, an auxiliary rotary steel cross beam is added between two rotary steel cross beams. By adding the auxiliary rotary steel cross beam, it can cooperate with the two rotary steel cross beams to jointly bear the weight of the slab, ensuring the stability and reliability of the operation of each cross beam when performing rotary steel on the slab.

[0085] Among them, the cross beams installed at the bottom of the rotary steel roller table can include: two cross beams with a distance greater than the first predetermined distance, and the distance between the remaining cross beams is a set of roller table distances, and the first predetermined distance is greater than the set of roller table distances. Among them, the first predetermined distance is two sets of roller table distances.

[0086] For slabs, their sizes vary, some being large and some small. When setting the spacing between crossbeams, the spacing between two of them (such as the first crossbeam and the second crossbeam respectively) can be set larger, for example, larger than the minimum length of the slab. The subsequent crossbeams can be incremented step by step based on this crossbeam spacing. The increment amplitude can be the spacing of a set of roller tracks. With such a setting, the optimization of the crossbeam layout can be achieved, thereby saving crossbeams and the corresponding equipment and reducing costs.

[0087] Among them, as Figure 5 shown, this slab is a slab with a small size. When the size of the slab is small, it can use only the first crossbeam and the second crossbeam for steel rotation, that is, the first crossbeam and the second crossbeam are steel-rotating crossbeams. The spacing between the first crossbeam and the second crossbeam is relatively close to the size of this slab, and it can rotate the steel more stably and reliably.

[0088] As Figure 6 shown, this slab is a slab with a large size. When the size of the slab is large, it can add another level of crossbeam (such as the third crossbeam) on the basis of the crossbeam spacing between the first crossbeam and the second crossbeam. At this time, the first crossbeam and the third crossbeam are used as steel-rotating crossbeams. The spacing between the first crossbeam and the third crossbeam is relatively close to the size of this slab, and it can rotate the steel more stably and reliably.

[0089] Before officially rotating the slab, by controlling the lateral movement of the crossbeam perpendicular to the rolling direction, different advancement amounts can be calculated according to the process requirements to adjust the steel-rotating angle of the slab or achieve cross-rolling steel rotation (rotating 90°).

[0090] Let the steel-rotating angle of a certain angle rolling pass be a, the length of the slab be L, the width of the slab be B; the spacing between adjacent two crossbeams be S12, S23, S34, S45…, the spacing between the side guide plates on both sides of the steel-rotating roller track be D0, and the distance between adjacent two rollers 4 on the steel-rotating roller track be DR, where the spacing between two crossbeams is the largest, greater than the minimum length of the slab, and the spacing of the remaining crossbeams is greater than or equal to the spacing of the steel-rotating roller track, taking Figure 5 or Figure 6 as an example.

[0091] When the spacing between the second and the third crossbeams is the largest: S 12 = S 34 =…S [n-1,n] = DR, S 23 = 2×DR

[0092] When the spacing between the first and the second crossbeams is the largest: S 23 = S 34 =…S [n-1,n] = DR, S 12 = 2×DR

[0093] 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 the calculation: the numbers and quantities of the crossbeams for steel rotation operations, and the transverse displacement of each crossbeam for steel rotation; let the transverse displacement of the 1st crossbeam be FW1, the transverse displacement of the 2nd crossbeam be FW2, and so on, FW3, FW4, …. Among them, this transverse displacement is the advancing amount when the crossbeam is centered and steel rotation is performed.

[0094] In the embodiment of the present application, after the slab enters the steel rotation roller table, side guide plates are used to center the slab. When the side guide plates are used to center the slab, the distance D0 between the side guide plates satisfies the following relational expression:

[0095] D0 = B × cos(a) + L × sin(a)

[0096] 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. When the distance D0 between the side guide plates satisfies the above relational expression, after the slab rotates to the target angle, the two butt joints of the slab can just contact the side guide plates. By using the constraint effect of the side guide plates on the slab, the slab can be efficiently and reliably centered along the center line in the rolling direction.

[0097] In some embodiments, determining at least two steel rotation crossbeams from the crossbeams to perform steel rotation on the slab according to the physical parameters of the slab may include:

[0098] Select two crossbeams with a distance less than the length of the slab, subtract the distance between the two crossbeams from the length of the slab to obtain a difference of Δd, and select the two crossbeams corresponding to when Δd is greater than zero and is the smallest, so as to find two crossbeams with the distance closest to the length of the slab. Since the greater the distance between the crossbeams, the more stable the steel rotation process. When the two crossbeams with the distance closest to the length of the slab are used as the steel rotation crossbeams, the steel rotation process can reach the most stable state.

[0099] When specifically selecting, it can be calculated and checked in turn from the two crossbeams with the farthest distance to the two crossbeams with the closest distance:

[0100] Δd = L - (S 12 + S 23 + … + S [n-1,n] ), …, Δd = L - (S 12 + S 23 ), Δd = L - S 12 ;

[0101] 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 two crossbeams, and L represents the length of the slab;

[0102] When Δd is greater than zero, the current two crossbeams are preliminarily determined as the slab-rotating crossbeams; after calculating the target rotation angle a of the slab, the projection of the slab length on the rolling center line is: LR = L × cos(a);

[0103] When the projection LR of the slab length on the rolling center line is also greater than the distance between the two crossbeams, two slab-rotating crossbeams are determined. Among them, the two slab-rotating crossbeams move a predetermined distance FW1 and FWn respectively along the direction perpendicular to the rolling direction.

[0104] Since the slab-rotating operation is carried out around the slab center, FW 1 = FW n Let the transverse displacement FW of the nth slab-rotating crossbeam be n . Then, along the slab-rotating crossbeam, the distance (FW n_min ) from the other side of the steel plate to the side guide is:

[0105] FW n_min = D 0 - B / cos(a) - FW n

[0106] That is: FW 1 – (D 0 - B / cos(a) - FW n ) = tan(a) × (S 12 + S 23 + … + S [n-1,n] )

[0107] FW 1 = FW n = [tan(a) × (S 12 + S 23 + … + S [n-1,n] ) – (D 0 - B / cos(a))] / 2.0

[0108] FW1 and FWn satisfy the following relationship:

[0109] FW 1 = FW n = [tan(a) × (S 12 + S 23 + … + S [n-1,n] ) – (D 0 - B / cos(a))] / 2.0

[0110] In the above formula, a represents the target rotation angle required for the slab, L represents the slab length, B represents the slab width, D0 represents the distance between the side guides, S 12 , S 23 , S [n-1,n]Represents the distance between two adjacent crossbeams.

[0111] Through the above calculations and checks, it can be ensured that during the entire process of steel rotation, the steel-rotating crossbeams can fully support the slab, and the situation where the slab is not stably supported or drops, thus affecting production, will not occur.

[0112] Such as Figure 7 As shown, in one embodiment, when the steel-rotating angle (target angle) is 90°, that is, when performing cross-rolling steel rotation, the control method for slab rotation and centering provided by the present application may include the following steps:

[0113] During the cross-rolling width spreading process, the slab rotates 90° and enters the rolling mill for width spreading rolling;

[0114] After the slab is spread to the target width, the slab is rotated 90° in the reverse direction for elongation rolling. During the rotation of the slab, the slab does not contact the side guide plate.

[0115] Among them, before the slab rotates 90°, the side guide plate can be fully opened so that the side guide plate does not interfere with the rotation of the slab.

[0116] After the slab rotates 90°, the control method further includes: using the side guide plate to center the slab so that the center of the slab is located on the rolling center line.

[0117] In this embodiment, during the cross-rolling width spreading process, the slab rotates 90° and enters the rolling mill for width spreading rolling until it is spread 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 rotates 90°, the side guide plate 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 is used to ensure that the center of the steel plate is located at the center of two steel-rotating crossbeams.

[0118] Determining at least two steel-rotating crossbeams in the crossbeams to rotate the slab according to the physical parameters of the slab includes:

[0119] Checking the relationship between the distance between the steel-rotating crossbeams and the width of the slab: subtracting the width of the slab from the distance between two crossbeams, and the obtained difference is Δdw. Find two crossbeams when Δdw is less than zero and the absolute value of Δdw is the smallest, and the numbers of the steel-rotating crossbeams are 1 and nw respectively;

[0120] Δdw = B - S 12 , Δdw = B - (S 12 +S 23 ), … Δdw = B - (S 12 +S 23 +…+S [n-1,n] )

[0121] Among them, S 12 , S 23 , S [n-1,n] represents the distance between two adjacent crossbeams, and B represents the width of the slab.

[0122] The slab rotation and centering control method provided in the embodiments of the present invention is for the medium and heavy 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 embodiments 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.

[0123] 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 understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0124] The above-mentioned various embodiments in this specification are all described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0125] 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 for facilitating the understanding of the present invention and is not used to limit the present invention. Any person skilled in the technical field to which the present invention belongs, without departing from the spirit and scope disclosed by the present invention, can make any modifications and changes in the form and details of the embodiments, but the patent protection scope 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 transfer rollers before and after the rolling mill, and the crossbeams are equipped with at least one steel transfer propulsion device that can extend out of the steel transfer rollers. When the crossbeams move, the steel transfer propulsion device can move with the crossbeams. 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 according to the physical parameters of the slab to transfer steel to the slab; the physical parameters at least include the size parameters of the slab; When the slab is being rolled, the slab is driven to rotate by the rolling propulsion device on the rolling beam, and the slab is rotated to a target angle by controlling the rolling beam to move a predetermined distance perpendicular to the rolling direction.

2. The method for controlling slab rotation and centering according to claim 1, characterized in that: The steel transfer propulsion device is installed on the crossbeam by a fixed connection method, and the fixed connection method includes any one of the following: welding, forging, and bolt connection.

3. The method for controlling slab rotation and centering according to claim 1, characterized in that: The at least two beams moving perpendicular to the rolling direction include two beams whose spacing is greater than a first predetermined spacing, and the spacing of the remaining beams is a group of roller spacings, and the first predetermined spacing is greater than the group of roller spacings.

4. The method for controlling slab rotation and centering according to claim 3, characterized in that: The first predetermined distance is the distance between two groups of rollers.

5. 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 rotating the slab to the target angle, positioning the slab by the side guide plate so that the target angle is reached after two diagonal corners of the slab contact the side guide plate.

6. 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.

7. The method for controlling slab rotation and centering according to claim 6, 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.

8. The method for controlling slab rotation and centering according to claim 7, 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.

9. The method for controlling slab rotation and centering according to claim 7, 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.

10. The method for controlling slab rotation and centering according to claim 9, 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.

11. The method for controlling slab rotation and centering according to claim 10, 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.

12. The method for controlling slab rotation and centering according to claim 11, characterized in that: Determining at least two steel-transfer beams in the beams according to the physical parameters of the slab, and performing steel-transfer on the slab includes: Select two beams with a spacing less than the length of the slab, 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 less than zero and the smallest absolute value of Δdw as the steel transfer beams. The numbers of the steel transfer beams are 1 and nw respectively; Δdw = BS 12 , Δdw=B-(S 12 +S 23 ), ... Δdw = B-(S 12 +S 23 +…+S [n-1,n] ) 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.

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