A process for controlling the shape and properties of a ds-rolled sheet

Abstract

The application provides a shape and property control process method of DS rolled plate, in which a constant misregistration shearing angle is kept in rough rolling DS rolling process, plate thickness is controlled by X-ray, hardness tester and rolling mill springback model, rough rolling DS rolling force stability control is realized by working roll bending and support roll crossing, the misregistration shearing angle is accurately adjusted by setting model in finish rolling DS rolling process, a crown tester and a plate shape tester are installed and working roll crossing and working roll bending are used to improve plate crown and flatness. The application realizes accurate control of rolling shearing force by using DS rolling technology, greatly improves plate rolling strength and hardness, appropriately softens plate by using annealing process, increases plate toughness, greatly improves overall performance of the plate by using full-process DS rolling technology, realizes plate shape and thickness control after rolling, and realizes DS rolling shape and property integration.

Description

A method for controlling the shape and properties of DS rolled sheet Technical Field

[0001] This invention relates to the field of metallurgical production technology, and in particular to a method for controlling the shape and properties of DS rolled plates by adjusting the misaligned rolling shear angle. Background Technology

[0002] In recent years, the role of asymmetric shear rolling technology in grain refinement and performance enhancement of metals undergoing severe plastic deformation has received widespread attention. Asymmetric shear rolling technology mainly includes synchronous misaligned rolling, serpentine rolling, and cross rolling.

[0003] Compared with synchronous staggered rolling and cross rolling, serpentine rolling has the most significant effect on grain refinement and performance enhancement in metals subjected to severe plastic deformation. Therefore, serpentine rolling technology has been widely studied by scholars at home and abroad in recent years. However, the sheet shape after serpentine rolling is difficult to meet industrial requirements. Therefore, a combination of serpentine rolling and synchronous rolling is generally used. Although the rolling process of combining serpentine rolling and synchronous rolling can further improve the performance of the sheet, it fails to maximize the performance enhancement of the sheet. The magnitude and direction of shear force in serpentine rolling play a key role in the performance enhancement of the sheet. Reasonable setting of shear force is conducive to maximizing the performance enhancement of the sheet by serpentine rolling. However, there is currently little research on the setting of shear force and the industrial-level control of sheet shape and thickness in the entire process of serpentine rolling. Summary of the Invention

[0004] In view of this, the present invention proposes a shape and property control process for DS-rolled sheet metal by adjusting the staggered rolling shear angle, so that each pass is serpentine rolling and the magnitude and direction of the shear force during the rolling process can be precisely controlled. This method can maximize the performance enhancement of the sheet metal after rolling and control the shape and thickness of the sheet metal, so that the performance and shape of the sheet metal can directly meet the industrial requirements after rolling. This realizes the integrated shape and property control of sheet metal rolling and solves the shortcomings of the prior art.

[0005] The technical solution adopted in this invention is as follows:

[0006] This invention provides a method for controlling the shape and properties of DS-rolled plates by adjusting the offset rolling shear angle, including rough DS rolling and finish DS rolling; wherein:

[0007] In the roughing DS rolling process, reversible rolling is performed using a roughing mill. Each pass involves roughing DS rolling, and a constant misalignment rolling shear angle is maintained by adjusting the reduction and the lateral misalignment of the upper and lower work rolls. Plate thickness is controlled using X-rays, a hardness tester, and a mill bounce model. The rolling force in the roughing DS rolling process is stabilized by using the intersection of the work roll bending roll and the support roll.

[0008] The precision rolling DS rolling process utilizes a precision rolling misalignment shear angle setting model to precisely adjust the misalignment rolling shear angle; and uses work roll crossing and work roll bending to improve the convexity and flatness of the sheet metal.

[0009] The model for setting the shear angle in the finishing mill misaligned rolling is as follows:

[0010] ;

[0011] In the formula: for The set value of the misaligned rolling shear angle of the stand. for The average value of the diameters of the upper and lower work rollers of the frame. for The average angular velocity of the upper and lower work rollers of the frame. for The equivalent crown of the upper work roll on the frame, for The equivalent crown of the lower work roll of the frame, for The set value of the roll gap of the frame.

[0012] Furthermore, maintaining a constant misaligned rolling shear angle by adjusting the reduction amount and the lateral misalignment of the upper and lower work rolls includes:

[0013] As the number of rolling passes increases, the reduction decreases while the horizontal misalignment between the upper and lower work rolls is reduced. The lateral misalignment between the upper and lower work rolls is adjusted by offsetting the work rolls along the support rolls, so that the misalignment rolling shear angle setting is constant.

[0014] Furthermore, plate thickness control is achieved using X-rays, hardness testers, and rolling mill bounce models, including:

[0015] After each rolling pass, the average thickness of the plate exit is detected by X-ray, and the hardness of the plate is measured in real time by a hardness tester. The roll gap error between the actual roll gap value and the preset roll gap value is calculated using the mill bounce model.

[0016] The rolling mill bounce model is as follows:

[0017] ;

[0018] In the formula: This represents the roll gap error between the actual roll gap value and the preset roll gap value. This represents the average thickness of the exported sheet metal. Set a value for the roll gap. Total rolling force For the rigidity of the rolling mill, The average hardness of the sheet after rolling. The average thickness of the plate entry point. This refers to the elastic contact length between the upper work roll and the upper support roll. This refers to the elastic contact length between the lower work roll and the lower support roll. The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. Set the value for the shear angle in the misaligned rolling process.

[0019] Furthermore, the rolling force in roughing DS rolling is stabilized and controlled by the intersection of the work roll bending roll and the support roll, including:

[0020] When the maximum difference in vertical rolling force between the drive side and the operating side of the work roll exceeds 570 kN within a single rolling pass, the vertical hydraulic cylinder uses work roll bending to compensate for the vertical rolling force fluctuation. The set work roll bending force is calculated using the work roll bending compensation model, which is as follows:

[0021] ;

[0022] In the formula: The bending force of the work roll; This represents the maximum fluctuation range of the vertical rolling force on the work roll drive side and the operating side. The radius of the upper working roller, The radius of the lower working roll is... The average width of the slab before rolling. Set the reduction amount for a single pass. The equivalent crown of the upper working roll, The equivalent crown of the lower working roll, The linear speed of the upper working roller, The linear speed of the lower working roller. The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. Set the value for the misaligned rolling shear angle;

[0023] When the maximum difference in horizontal rolling force between the drive side and the operating side of the work roll exceeds 125 kN within a single rolling pass, the horizontal hydraulic cylinder horizontally pushes the upper and lower support rolls to cross, reducing the difference in horizontal rolling force. The set support roll crossing angle is calculated using a support roll crossing correction model, which is as follows:

[0024] ;

[0025] In the formula: For the cross angle of the support rollers, This represents the maximum difference in horizontal rolling force between the drive side and the operating side of the work rolls. The radius of the upper support roller is... The radius of the lower support roller is... The average width of the slab before rolling. Set the reduction amount for a single pass. This refers to the elastic contact length between the upper work roll and the upper support roll. This refers to the elastic contact length between the lower work roll and the lower support roll. The equivalent convexity of the upper support roller, The equivalent crown of the lower support roller, The linear speed of the upper support roller, The linear speed of the lower support roller, The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. Set the value for the shear angle in the misaligned rolling process.

[0026] Furthermore, the convexity and flatness of the sheet metal are improved by utilizing work roll crossing and work roll bending, including:

[0027] The cross angle of the work rolls and the bending force of the work rolls are calculated using the plate crown and straightness control model. The plate crown and straightness control model is as follows:

[0028] ;

[0029] In the formula: for The cross angle of the work rollers on the frame, for The maximum difference in horizontal rolling force between the work roll drive side and the operating side of the mill stand. for The average value of the diameters of the upper and lower work rollers of the frame. for Average width of the slab before rolling on the mill stand. for The single-pass reduction setting value of the frame. for The elastic contact length between the upper work roller and the upper support roller of the frame. for The elastic contact length between the lower work roller and the lower support roller of the frame. for The equivalent crown of the upper work roll on the frame, for The equivalent crown of the lower work roll of the frame, for The linear speed of the upper working roller on the frame, for The linear speed of the lower working roller on the frame, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for Bending force of the work rolls on the frame. for Average vertical rolling force of the stand.

[0030] Furthermore, the finishing DS rolling process also includes: sheet tension control.

[0031] Furthermore, sheet tension control includes:

[0032] when Misalignment of the stand during rolling shearing At that time, the roll rotation speed model and tension control model were used to adjust the frame. The tension causes it to reach the set value. At this time, the forward slip coefficient, the change in forward slip coefficient, the backward slip coefficient, and the change in backward slip coefficient in the first model of the roll rotation speed are all 0.

[0033] when Misalignment of the stand during rolling shearing At that time, the roll rotation speed model and tension control model 2 are used to adjust the standby frame. The tension is used to bring it to the set value;

[0034] The model for the rotational speed of the rolls is as follows:

[0035] ;

[0036] in for Exit speed of the rolled piece on the stand, for The entry speed of the workpiece on the stand. The elastic modulus of the rolled piece. For time step, For rack Target value of pretension, For rack The current value of the front tension, for The constant coefficient of flattening of the roll system between the workpiece and the work rolls on the stand. This refers to the distance between racks. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand;

[0037] Tension control model one is:

[0038] ;

[0039] in for The unit forward tension of the frame, for The thickness of the rack exit, for time Unit tension of the frame, for time The thickness of the rack exit, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand;

[0040] Tension control model two is:

[0041] ;

[0042] in for The unit back tension of the frame, for The thickness of the rack entrance, for time Unit back tension of the frame, for time The thickness of the rack entrance, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand.

[0043] Furthermore, after rough DS rolling and before finish DS rolling, there is an annealing process; after finish DS rolling, there is a secondary annealing process.

[0044] Furthermore, the annealing temperature is the same as the secondary annealing temperature, the annealing time is half that of the secondary annealing time, and both the annealing and secondary annealing processes are cooled by air cooling or room temperature water cooling.

[0045] The beneficial effects of this invention are:

[0046] This invention transforms the traditional rolling method into a full-process DS rolling process. It utilizes the staggered rolling shear angle to precisely control the rolling shear force. In the roughing DS rolling process, a constant staggered rolling shear angle is maintained. In the finishing DS rolling process, the staggered rolling shear angle is precisely adjusted using a set model, which significantly improves the rolling strength and hardness of the plate. An annealing process is added to the roughing DS rolling process to appropriately soften the plate and increase its toughness.

[0047] In the roughing stage, X-rays, hardness testers, and mill bounce models are used to control plate thickness. The difference between vertical and horizontal rolling forces on the operating and drive sides is reduced by using work roll bending and support roll crossing, respectively, thus achieving robust control of rolling forces in the roughing stage. In the finishing stage, a crown gauge and a shape gauge are installed, and work roll crossing and work roll bending are used to improve the crown and straightness of the plate. This invention utilizes DS rolling technology to achieve precise control of rolling shear force, while simultaneously achieving post-roll plate shape and thickness control, realizing integrated shape and property control in DS rolling.

[0048] By adding an annealing process to the rough DS rolling and performing secondary annealing in the finish DS rolling, the sheet material is appropriately softened, increasing its toughness. This results in a significant improvement in the strength, hardness, and toughness of DS rolled metal sheets compared to conventional rolling methods. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 is a flowchart of the DS rolling process in an embodiment of the present invention;

[0051] Figure 2 is a schematic diagram of the shear angle during rough DS rolling in an embodiment of the present invention;

[0052] Figure 3 is a schematic diagram of robust control of plate shape, plate thickness and rolling force during the roughing DS rolling stage in an embodiment of the present invention;

[0053] Figure 4 shows the hardness distribution of 6N pure copper along the thickness direction after rough rolling DS rolling and synchronous rolling heat treatment in the embodiment of the present invention.

[0054] Figure 5 is a schematic diagram of the seven-stand plate shape and thickness control in the DS rolling stage of the present invention.

[0055] in, The radius of the upper working roller; The radius of the lower working roll; The radius of the upper support roller; The radius of the lower support roller; The average thickness of the plate at the inlet; This represents the average thickness of the sheet metal at the export site. This refers to the misalignment of the upper and lower work rollers. This is the misalignment angle between the upper working roll and the upper support roll; This is the misalignment angle between the lower working roll and the lower support roll; Set the value for the misaligned rolling shear angle; - Seven DS rolling mills. Detailed Implementation

[0056] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0057] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0058] This invention provides a method for controlling the shape and properties of DS-rolled sheet metal by adjusting the offset rolling shear angle. In the roughing DS rolling process, a constant offset rolling shear angle is maintained, and sheet thickness is controlled using X-rays, a hardness tester, and a mill bounce model. The rolling force in the roughing DS rolling process is stabilized by using work roll bending and support roll cross-sections. In the finishing DS rolling process, the offset rolling shear angle is precisely adjusted using a set model, and a crown gauge and sheet shape gauge are installed. Work roll cross-sections and work roll bending are used to improve the sheet's crown and straightness. This invention achieves precise control of rolling shear force using DS rolling technology, significantly improving sheet metal performance, while simultaneously achieving post-roll sheet shape and thickness control, realizing integrated shape and property control in DS rolling.

[0059] As shown in Figure 1, the present invention proposes a method for controlling the shape and properties of DS-rolled plates by adjusting the misaligned rolling shear angle. The DS rolling process is a serpentine rolling process in which a constant misaligned rolling shear angle is maintained during the roughing stage or the misaligned rolling shear angle is precisely adjusted using a set model during the finishing stage; it includes the following steps:

[0060] S1. Production of continuously cast billets;

[0061] S2, Heating of continuously cast billets;

[0062] S3, High-pressure water phosphorus removal;

[0063] S4, rough rolling DS rolling;

[0064] Specifically, process, strip, and mill parameters for the roughing stage are collected. The roughing stage utilizes a single roughing mill for reversible rolling, with each pass involving roughing DS rolling. As the number of rolling passes increases, the reduction decreases while simultaneously reducing the horizontal misalignment between the upper and lower work rolls. The lateral misalignment between the upper and lower work rolls is adjusted by offsetting the work rolls along the support rolls, ensuring that the misalignment rolling shear angle is set to a constant value. The shear angle of the roughing DS rolling is shown in Figure 2. The offset rolling shear angle is the angle between the line connecting the lowest point of the upper work roll and the highest point of the lower work roll and the vertical line passing through the lowest point of the upper roll. The offset rolling shear angle is adjusted in magnitude and direction by the reduction amount and the lateral offset amount of the upper and lower work rolls. The reduction amount is adjusted by the offset of the work roll along the support roll and the vertical reduction of the upper support roll. The lateral offset amount between the upper and lower work rolls is adjusted by the offset of the work roll along the support roll.

[0065] S5. Plate thickness control in rough rolling DS rolling;

[0066] Specifically, as shown in Figure 3, after each rolling pass, the average thickness of the plate exit is detected by X-ray, and the hardness of the plate is measured in real time using a hardness tester. The roll gap error between the actual roll gap value and the preset roll gap value is calculated using the mill bounce model, which is shown in formula (1):

[0067] (1)

[0068] In the formula: This represents the roll gap error between the actual roll gap value and the preset roll gap value. This represents the average thickness of the exported sheet metal. Set a value for the roll gap. Total rolling force For the rigidity of the rolling mill, The average hardness of the sheet after rolling. The average thickness of the plate entry point. This refers to the elastic contact length between the upper work roll and the upper support roll. This refers to the elastic contact length between the lower work roll and the lower support roll. The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. Set the value for the misaligned rolling shear angle;

[0069] When the roll gap error is less than 0.12mm, the pressing amount is adjusted in the next pass by offsetting the upper work roll along the upper support roll and the lower work roll along the lower support roll. When the roll gap error is between 0.12mm and 1.4mm, the pressing amount is adjusted in the next pass by offsetting the upper work roll along the upper support roll and vertically pressing down the upper support roll. When the roll gap error is greater than 1.4mm, the pressing amount is adjusted in the next pass by offsetting the upper work roll along the upper support roll, offsetting the lower work roll along the lower support roll, and vertically pressing down the upper support roll.

[0070] S6. Stable control of rolling force in roughing DS rolling;

[0071] Specifically, the rolling force stability control in roughing DS rolling includes vertical rolling force stability control and horizontal rolling force stability control. When the maximum difference between the vertical rolling force on the drive side and the operating side of the work roll exceeds 570KN in a rolling pass, the vertical hydraulic cylinder uses work roll bending to compensate for the vertical rolling force fluctuation. The set work roll bending force is calculated using the work roll bending compensation model, which is shown in formula (2).

[0072] (2)

[0073] In the formula: The bending force of the work roll; This represents the maximum fluctuation range of the vertical rolling force on the work roll drive side and the operating side. The radius of the upper working roller, The radius of the lower working roll is... The average width of the slab before rolling. Set the reduction amount for a single pass. The equivalent crown of the upper working roll, The equivalent crown of the lower working roll, The linear speed of the upper working roller, The linear speed of the lower working roller. The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. Set the value for the misaligned rolling shear angle;

[0074] When the maximum difference in horizontal rolling force between the drive side and the operating side of the work roll exceeds 125KN in a single rolling pass, the horizontal hydraulic cylinder horizontally pushes the upper and lower support rolls to cross and reduce the difference in horizontal rolling force. The set support roll crossing angle is calculated using the support roll crossing correction model, which is shown in formula (3).

[0075] (3)

[0076] In the formula: For the cross angle of the support rollers, This represents the maximum difference in horizontal rolling force between the drive side and the operating side of the work rolls. The radius of the upper support roller is... The radius of the lower support roller is... The average width of the slab before rolling. Set the reduction amount for a single pass. This refers to the elastic contact length between the upper work roll and the upper support roll. This refers to the elastic contact length between the lower work roll and the lower support roll. The equivalent convexity of the upper support roller, The equivalent crown of the lower support roller, is the linear velocity of the upper backup roll, is the linear velocity of the lower backup roll, is the misalignment angle between the upper work roll and the upper backup roll, is the misalignment angle between the lower work roll and the lower backup roll, is the set value of the misalignment rolling shear angle;

[0077] Using the DS rolling mill modified in the laboratory, a rough rolling DS rolling and annealing experiment was carried out on 6N pure copper samples with a thickness from 20 mm to 1 mm. Each pass was rolled by 0.5 mm, the annealing temperature was 300 °C, the misalignment rolling shear angle for each pass of rough rolling DS rolling was 5 degrees, and the roll speed ratio was 1.2. The comparative distribution diagram of the hardness of 6N pure copper along the thickness direction after rough rolling DS rolling and synchronous rolling heat treatment is shown in Figure 4. Among them, the rolling method of DS rolling shows better hardness stability than synchronous rolling, and the average hardness of the plate after DS rolling is higher than that after synchronous rolling.

[0078] S7. Annealing treatment;

[0079] S8. Finishing DS rolling;

[0080] Specifically, collect and input the process, strip, and rolling mill parameters before and after the misalignment process change. Among them, represents the stand number of the finishing mill unit. The subscript i value is the current rolling stand number, and 0 < i < 8 and i is an integer. In the finishing stage, seven finishing mills are used for continuous rolling under additional tension. The first to seventh passes are for finishing DS rolling. The stand adopts a misalignment rolling shear angle calculated by the finishing misalignment rolling shear angle setting model. The finishing misalignment rolling shear angle setting model is shown in formula (4):

[0081] (Four)

[0082] In the formula: is the set value of the misalignment rolling shear angle of the stand, is the average value of the sum of the diameters of the upper and lower work rolls of the stand, is the average value of the angular velocities of the upper and lower work rolls of the stand,[[ID=I]] is the equivalent crown of the upper work roll of the stand, is the equivalent crown of the lower work roll of the stand, is the set value of the roll gap of the stand.

[0083] S9. Control of the crown and flatness of the plate during finishing DS rolling;

[0084] Figure 5 shows a schematic diagram of the plate shape and thickness control of the seven stands in the finishing DS rolling stage. A convexity meter and a plate shape meter are installed at the rack exit. The frame utilizes the cross angle and bending force of the working rolls to improve the convexity and straightness of the sheet metal. The cross angle and bending force of the working rolls are calculated by the sheet metal convexity and straightness control model, which is shown in formula (5).

[0085] (5)

[0086] In the formula: for The cross angle of the work rollers on the frame, for The maximum difference in horizontal rolling force between the work roll drive side and the operating side of the mill stand. for The average value of the diameters of the upper and lower work rollers of the frame. for Average width of the slab before rolling on the mill stand. for The single-pass reduction setting value of the frame. for The elastic contact length between the upper work roller and the upper support roller of the frame. for The elastic contact length between the lower work roller and the lower support roller of the frame. for The equivalent crown of the upper work roll on the frame, for The equivalent crown of the lower work roll of the frame, for The linear speed of the upper working roller on the frame, for The linear speed of the lower working roller on the frame, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for Bending force of the work rolls on the frame. for Average vertical rolling force of the stand.

[0087] S10, tension control of sheet metal in finish DS rolling;

[0088] when Misalignment of the stand during rolling shearing At that time, the roll rotation speed model and tension control model were used to adjust the frame. The tension causes it to reach the set value, at which point the forward slip coefficient, the change in forward slip coefficient, the backward slip coefficient, and the change in backward slip coefficient in Model 1 of the roll rotation speed are all 0; when Misalignment of the stand during rolling shearing At that time, the roll rotation speed model and tension control model 2 are used to adjust the standby frame. The tension causes it to reach the set value.

[0089] The model for the rotational speed of the roll is shown in formula (6):

[0090] (6)

[0091] in for Exit speed of the rolled piece on the stand, for The entry speed of the workpiece on the stand. The elastic modulus of the rolled piece. For time step, For rack Target value of pretension, For rack The current value of the front tension, for The constant coefficient of flattening of the roll system between the workpiece and the work rolls on the stand. This refers to the distance between racks. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand.

[0092] Tension control model one, as shown in formula (7):

[0093] (7)

[0094] in for The unit forward tension of the frame, for The thickness of the rack exit, for time Unit tension of the frame, for time The thickness of the rack exit, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand.

[0095] Tension control model two is shown in formula (8):

[0096] (8)

[0097] in for The unit back tension of the frame, for The thickness of the rack entrance, for time Unit back tension of the frame, for time The thickness of the rack entrance, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand.

[0098] S11, Cooling;

[0099] S12, Straightening, Shearing;

[0100] S13, Secondary annealing treatment.

[0101] In this process, the annealing temperature in step S7 is the same as the secondary annealing temperature in step S13, the annealing time in step S7 is half the secondary annealing time in step S13, and the cooling methods for both the annealing in step S7 and the secondary annealing in step S13 are air cooling or room temperature water cooling.

[0102] In the above embodiments, the traditional rolling method is changed to full-process DS rolling. The rolling shear force is precisely controlled by the staggered rolling shear angle. The staggered rolling shear angle is maintained in the roughing DS rolling process, and the staggered rolling shear angle is precisely adjusted by the set model in the finishing DS rolling process, which greatly improves the rolling strength and hardness of the plate. An annealing process is added to the roughing DS rolling to appropriately soften the plate and increase its toughness.

[0103] In the roughing stage, X-rays, hardness testers, and mill bounce models are used to control plate thickness. The difference between vertical and horizontal rolling forces on the operating and drive sides is reduced by using work roll bending and support roll crossing, respectively, thus achieving robust control of rolling forces in the roughing stage. In the finishing stage, a crown gauge and a shape gauge are installed, and work roll crossing and work roll bending are used to improve the crown and straightness of the plate. This invention utilizes DS rolling technology to achieve precise control of rolling shear force, while simultaneously achieving post-roll plate shape and thickness control, realizing integrated shape and property control in DS rolling.

[0104] By adding an annealing process to the rough DS rolling and performing secondary annealing in the finish DS rolling, the sheet material is appropriately softened, increasing its toughness. This results in a significant improvement in the strength, hardness, and toughness of DS rolled metal sheets compared to conventional rolling methods.

[0105] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the shape and properties of DS-rolled sheet metal by adjusting the offset rolling shear angle, characterized in that, The process includes roughing DS rolling and finishing DS rolling. In the roughing DS rolling process, a reversible rolling mill is used, with each pass involving roughing DS rolling. A constant misalignment rolling shear angle is maintained by adjusting the reduction and the lateral misalignment of the upper and lower work rolls. Plate thickness is controlled using X-rays, a hardness tester, and a mill bounce model. The rolling force is stabilized during roughing DS rolling by using work roll bending and support roll cross-rotation. In the finishing DS rolling process, the misalignment rolling shear angle is precisely adjusted using a finishing DS misalignment rolling shear angle setting model. Work roll cross-rotation and work roll bending are used to improve the plate's convexity and flatness. The finishing DS misalignment rolling shear angle setting model is as follows: In the formula: for The set value of the misaligned rolling shear angle of the stand. for The average value of the diameters of the upper and lower work rollers of the frame. for The average angular velocity of the upper and lower work rollers of the frame. for The equivalent crown of the upper work roll on the frame, for The equivalent crown of the lower work roll of the frame, for The roll gap setting value of the mill stand; among which, the rolling force stability control in roughing DS rolling is achieved by using the cross-section of the work roll bending roll and the support roll, including: when the maximum difference in vertical rolling force between the drive side and the operating side of the work roll exceeds 570KN within a rolling pass, the vertical hydraulic cylinder uses the work roll bending roll to compensate for the vertical rolling force fluctuation. The set work roll bending roll force is calculated using the work roll bending roll compensation model, which is as follows: In the formula: The bending force of the work roll; This represents the maximum fluctuation range of the vertical rolling force on the work roll drive side and the operating side. The radius of the upper working roller, The radius of the lower working roll is... The average width of the slab before rolling. Set the reduction amount for a single pass. The equivalent crown of the upper working roll, The equivalent crown of the lower working roll, The linear speed of the upper working roller, The linear speed of the lower working roller. The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. The set value for the offset rolling shear angle; when the maximum difference in horizontal rolling force between the drive side and the operating side of the work roll exceeds 125KN within a rolling pass, the horizontal hydraulic cylinder horizontally pushes the upper and lower support rolls to cross and reduce the difference in horizontal rolling force. The set support roll crossing angle is calculated using the support roll crossing correction model, which is as follows: In the formula: For the cross angle of the support rollers, This represents the maximum difference in horizontal rolling force between the drive side and the operating side of the work rolls. The radius of the upper support roller is... The radius of the lower support roller is... This refers to the elastic contact length between the upper work roll and the upper support roll. This refers to the elastic contact length between the lower work roll and the lower support roll. The equivalent convexity of the upper support roller, The equivalent crown of the lower support roller, The linear speed of the upper support roller, The lower support roller linear velocity; wherein, the convexity and straightness of the sheet are improved by utilizing the work roller crossing and work roller bending, including: the work roller crossing angle and work roller bending force are calculated by the sheet convexity and straightness control model, which is as follows: In the formula: for The cross angle of the work rollers on the frame, for The maximum difference in horizontal rolling force between the work roll drive side and the operating side of the mill stand. for The average value of the diameters of the upper and lower work rollers of the frame. for Average width of the slab before rolling on the mill stand. for The single-pass reduction setting value of the frame. for The elastic contact length between the upper work roller and the upper support roller of the frame. for The elastic contact length between the lower work roller and the lower support roller of the frame. for The equivalent crown of the upper work roll on the frame, for The equivalent crown of the lower work roll of the frame, for The linear speed of the upper working roller on the frame, for The linear speed of the lower working roller on the frame, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for Bending force of the work rolls on the frame. for Average vertical rolling force of the stand.

2. The method for controlling the shape and properties of DS-rolled sheet metal by adjusting the misaligned rolling shear angle according to claim 1, characterized in that, Maintaining a constant misaligned rolling shear angle by adjusting the reduction amount and the lateral misalignment amount of the upper and lower work rolls includes: reducing the horizontal misalignment amount between the upper and lower work rolls while decreasing the reduction amount as the number of rolling passes increases; adjusting the lateral misalignment amount between the upper and lower work rolls by offsetting the work rolls along the support rolls, so that the misaligned rolling shear angle setting value is constant.

3. The method for controlling the shape and properties of DS-rolled sheet metal by adjusting the misaligned rolling shear angle according to claim 1, characterized in that, Thickness control is achieved using X-rays, a hardness tester, and a mill bounce model. This includes: after each rolling pass, X-rays are used to detect the average thickness of the sheet at the exit, and a hardness tester is used to measure the sheet's hardness in real time. The roll gap error between the actual and preset roll gap values ​​is calculated using the mill bounce model. The mill bounce model is as follows: In the formula: This represents the roll gap error between the actual roll gap value and the preset roll gap value. This represents the average thickness of the exported sheet metal. Set a value for the roll gap. Total rolling force For the rigidity of the rolling mill, The average hardness of the sheet after rolling. The average thickness of the plate entry point. This refers to the elastic contact length between the upper work roll and the upper support roll. This refers to the elastic contact length between the lower work roll and the lower support roll. The misalignment angle between the upper work roll and the upper support roll. The misalignment angle between the lower work roll and the lower support roll. Set the value for the shear angle in the misaligned rolling process.

4. The method for controlling the shape and properties of DS-rolled sheet metal by adjusting the misaligned rolling shear angle according to claim 1, characterized in that, The finishing DS rolling process also includes: sheet tension control.

5. The method for controlling the shape and properties of DS-rolled sheet metal by adjusting the misaligned rolling shear angle according to claim 4, characterized in that, Sheet tension control, including: when Misalignment of the stand during rolling shearing At that time, the roll rotation speed model and tension control model were used to adjust the frame. The tension causes it to reach the set value, at which point the forward slip coefficient, the change in forward slip coefficient, the backward slip coefficient, and the change in backward slip coefficient in Model 1 of the roll rotation speed are all 0; when Misalignment of the stand during rolling shearing At that time, the roll rotation speed model and tension control model 2 are used to adjust the standby frame. The tension is applied to bring it to a set value; the model for the roll rotation speed is as follows: ;in for Exit speed of the rolled piece on the stand, for The entry speed of the workpiece on the stand. The elastic modulus of the rolled piece. For time step, For rack Target value of pretension, For rack The current value of the front tension, for The constant coefficient of flattening of the roll system between the workpiece and the work rolls on the stand. This refers to the distance between racks. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value for the misaligned rolling shear angle of the stand; the tension control model one is: ;in for The unit forward tension of the frame, for The thickness of the rack exit, for time Unit tension of the frame, for time The thickness of the rack exit, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value for the misaligned rolling shear angle of the stand; the tension control model two is: ;in for The unit back tension of the frame, for The thickness of the rack entrance, for time Unit back tension of the frame, for time The thickness of the rack entrance, for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand. for The misalignment angle between the upper work roll and the upper support roll of the frame. for The misalignment angle between the lower work roll and the lower support roll of the frame. for The set value of the misaligned rolling shear angle of the stand.

6. The method for controlling the shape and properties of DS-rolled sheet metal by adjusting the misaligned rolling shear angle according to claim 1, characterized in that, After roughing DS rolling and before finishing DS rolling, there is an annealing process; after finishing DS rolling, there is a secondary annealing process.

7. The method for controlling the shape and properties of DS-rolled sheet metal by adjusting the misaligned rolling shear angle according to claim 6, characterized in that, The annealing temperature is the same as the secondary annealing temperature, and the annealing time is half that of the secondary annealing time. Both the annealing and secondary annealing processes are cooled by air cooling or room temperature water cooling.

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