Method, device and apparatus for calculating roll gap during thickness increase rolling of metal slab

Abstract

The present invention discloses a method, device, and apparatus for calculating the roll gap during the thickness increase rolling process of a metal slab, relates to the field of metal rolling technology, and is used to solve the problem of low accuracy in calculating the rolling force and roll gap during the thickness increase rolling process of a metal slab in the prior art. The method comprises: determining roll parameters, workpiece parameters, and rolling process parameters according to target pass rolling process specification data; establishing a velocity field that satisfies velocity boundary conditions based on the deformation characteristics of the workpiece, and calculating target parameters during the thickness increase rolling process of the metal slab; obtaining the minimum value of the total power functional at any time based on the internal deformation power, friction power, and shear power at any time during the thickness increase rolling process of the metal slab, and calculating the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab; and calculating the calculated roll gap value during the thickness increase rolling process of the metal slab based on the roll gap spacing and the rolling force in the deformation zone.

Description

Technical Field

[0001] The present invention relates to the technical field of metal rolling, and in particular to a method, device and equipment for calculating the roll gap during a thickness increase rolling process of a metal slab. Background Art

[0002] Longitudinal Proiled (LP) steel plates are produced through a special variable-thickness rolling process, where their thickness varies along the rolling direction. They are a typical product produced using this technology. LP steel plates are manufactured by continuously varying the roll opening during production to alter their longitudinal thickness. They are also known as wedge-shaped steel plates. Traditionally rolled steel plates strive for uniform thickness, but the loads they bear during use are typically uneven. Using uniform thickness to withstand uneven external forces inevitably results in wasteful steel production. LP steel plates, on the other hand, offer advantages such as saving steel and reducing structural weight. They are known as energy-saving green steel plates and can be fashioned into various shapes to optimize material conservation, tailored to the varying stresses encountered in different applications.

[0003] Longitudinally variable thickness steel plates are in great demand in the shipbuilding, bridge, and construction industries. Their special cross-sections can meet the diverse design requirements for weight reduction in steel structures such as ships, bridges, and buildings. Their advantages include reduced structural mass, reduced weld workload, elimination of pads in bolted joints and machining at welded joints, lower manufacturing costs, and improved structural safety. Longitudinally variable thickness steel plates have excellent application prospects and are favored by domestic and foreign steel manufacturers and the construction industry, with broad application prospects. During the rolling process, the thickness of the longitudinally variable thickness steel plates changes continuously. Before the rolling process begins, a mathematical method different from traditional rolling is required to pre-set important parameters such as rolling force and roll gap.

[0004] Therefore, there is an urgent need to provide a more reliable solution for calculating the roll gap during the thickness increase rolling process of metal slabs. Summary of the Invention

[0005] The purpose of the present invention is to provide a method, device and equipment for calculating the roll gap during the rolling process of increasing the thickness of a metal slab, so as to solve the problem of low calculation accuracy of the rolling force and the roll gap during the rolling process of increasing the thickness of a metal slab in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for calculating the roll gap during a metal slab thickness increase rolling process, the method comprising:

[0008] Determine the roll parameters, workpiece parameters and rolling process parameters according to the target pass rolling process specification data;

[0009] According to the deformation characteristics of the rolled piece, a velocity field that satisfies the velocity boundary conditions is established, and target parameters in the thickness increase rolling process of the metal slab are calculated; the target parameters include at least the rolling time corresponding to the thickness increase rolling process of the metal slab, the rolling zone inclination angle, the distance of the exit position of the thickness increase rolling deformation zone from the center line of the rolls, the distance of the entrance position of the thickness increase rolling deformation zone from the center line of the rolls, and the deformation resistance of the deformation zone;

[0010] Based on the internal deformation power, friction power and shear power at any time during the thickness increase rolling process of the metal slab, the minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab is calculated;

[0011] The thickness of the metal slab is increased by the roll gap calculation value during the rolling process according to the roll gap spacing and the rolling force in the deformation zone.

[0012] Optionally, based on the deformation characteristics of the rolled piece, a velocity field that meets the velocity boundary conditions is established to calculate target parameters during the thickness increase rolling process of the metal slab, specifically including:

[0013] According to the velocity boundary conditions and volume invariance conditions of the deformation zone, the velocity field and strain velocity field of the rolling deformation zone that meet the motion permission conditions are established;

[0014] The rolling time and rolling zone inclination angle corresponding to the thickness increase rolling process of the metal slab are determined by the roller upward movement speed, the length of the rolling zone where the thickness of the rolled piece is increased, the thickness of the thick zone and the thickness of the thin zone of the rolled piece;

[0015] Calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls;

[0016] The deformation resistance of the deformation zone of the metal sheet is calculated based on the rolled material and rolling process parameters.

[0017] Optionally, based on the internal deformation power, friction power, and shear power at any time during the rolling process of the metal slab with increased thickness, a minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the rolling process of the metal slab with increased thickness is calculated, specifically including:

[0018] Calculating the internal deformation power, friction power and shear power at any time during the rolling process of the metal slab thickness increase based on the deformation resistance;

[0019] The total power functional is calculated based on the internal deformation power, friction power and shear power;

[0020] According to the total power functional corresponding to different neutral angles, the minimum value of the total power functional at any time is obtained;

[0021] Based on the relationship between the total power functional and the rolling force, the rolling force in the deformation zone at any time during the rolling process of the metal slab with increasing thickness is calculated.

[0022] Optionally, based on the velocity boundary conditions and volume invariance conditions of the deformation zone, a velocity field and a strain velocity field of the rolling deformation zone that meet the motion permission conditions are established, specifically including:

[0023] Using the formula:

[0024] ;

[0025] Calculate the velocity field in the rolling deformation zone; where, is the velocity component in the length direction of the rolled piece, is the entry speed of the rolled piece, are the undetermined parameters under different production conditions, is the thickness of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the roller upward moving speed, is the roller flattening radius, is the angle between the line from the contact point at the entrance of the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls at any time, It is the angle between the line connecting any point in the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls. is the velocity component in the width direction of the rolled piece, is the velocity component in the thickness direction of the rolled piece, , Indicates the width direction of the rolled piece. Indicates the thickness direction of the rolled piece;

[0026] Using the formula:

[0027] ;

[0028] Calculate the strain velocity field in the rolling deformation zone; where, is the strain rate component in the length direction of the rolled piece, is the strain rate component in the width direction of the rolled piece, is the strain rate component in the thickness direction of the rolled piece.

[0029] Optionally, the rolling time and the rolling zone inclination angle corresponding to the thickness increase rolling process of the metal slab are determined based on the roller upward movement speed, the length of the rolling zone where the thickness of the rolled piece is increased, the thickness of the thick zone and the thickness of the thin zone of the rolled piece, specifically including:

[0030] Substitute the roller upward speed, the thickness of the thick area and the thickness of the thin area of ​​the rolled product into the formula:

[0031] ;

[0032] The rolling time corresponding to the thickness increase of the metal slab during the rolling process is calculated; wherein, is the thickness of the thick area of ​​the rolled piece, is the thickness of the thin area of ​​the rolled piece, is the roller upward movement speed;

[0033] Substitute the thickness of the rolled piece plus the length of the rolling zone, the thickness of the thick zone of the rolled piece, and the thickness of the thin zone into the formula:

[0034] ;

[0035] The rolling zone inclination angle corresponding to the rolling process of the metal slab thickness increase is calculated; wherein, Increase the length of the rolling zone for the thickness of the rolled product.

[0036] Optionally, calculating the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls includes:

[0037] Using the formula:

[0038] ;

[0039] ;

[0040] ;

[0041] ;

[0042] Calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls; The distance from the roller centerline to increase the thickness of the rolling deformation zone entrance position is To increase the thickness, the distance of the exit position of the rolling deformation zone deviates from the center line of the rolls. is the thickness of the deformation zone outlet at any time, is the thickness of the thin area of ​​the rolled piece, is the roller upward moving speed, is any time during the rolling time, is the gap between the rollers, is the roller flattening radius, is the inclination angle of the rolling zone, is the thickness of the rolled piece;

[0043] The calculation of the deformation resistance of the deformation zone of the metal sheet according to the rolled material and rolling process parameters specifically includes:

[0044] Using the formula:

[0045] ;

[0046] Calculate the deformation resistance of the metal sheet deformation zone; where, is the deformation resistance of the metal sheet deformation zone, For T=1000℃, , The deformation resistance of metal, 、 、 、 、 、 is the preset material coefficient related to the deformation condition, is the initial temperature of the rolled piece, is the average deformation velocity.

[0047] Optionally, based on the internal deformation power, friction power, and shear power at any time during the rolling process of the metal slab with increased thickness, a minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the rolling process of the metal slab with increased thickness is calculated, specifically including:

[0048] Using the formula:

[0049] ;

[0050] Calculate the minimum value of the total power functional at any time; where, is the total power functional, is the neutral angle, is the internal deformation power, is the shear power, is the friction power;

[0051] Using the formula:

[0052] ;

[0053] Calculate the rolling force in the deformation zone at any moment during the rolling process of the metal slab with increasing thickness;

[0054] ;

[0055] in, is the force arm coefficient, is the roller linear speed, is the original radius of the roller, is the velocity component in the width direction of the rolled piece.

[0056] Optionally, the thickness of the metal slab is increased by calculating the roll gap value during the rolling process according to the roll gap distance and the rolling force in the deformation zone, specifically including:

[0057] Using the formula:

[0058] ;

[0059] Calculate the thickness of the metal slab by adding the roll gap calculation value during the rolling process; where, is the gap between the rollers, is the rolling force in the deformation zone, is the rolling mill stiffness.

[0060] Compared with the prior art, the method for calculating the roll gap during the thickness-increasing rolling process of a metal slab provided by the present invention determines roll parameters, workpiece parameters, and rolling process parameters according to target pass rolling process data; establishes a velocity field that satisfies velocity boundary conditions based on the deformation characteristics of the workpiece, and calculates the target parameters during the thickness-increasing rolling process of the metal slab; obtains the minimum value of the total power functional at any time based on the internal deformation power, friction power, and shear power at any time during the thickness-increasing rolling process of the metal slab, and calculates the rolling force in the deformation zone at any time during the thickness-increasing rolling process of the metal slab; and calculates the calculated roll gap value during the thickness-increasing rolling process of the metal slab based on the roll gap spacing and the rolling force in the deformation zone. The solution provided by the present invention is mainly aimed at calculating the roll gap during the thickness-increasing rolling process of the metal slab, and can calculate the roll gap during the thickness-increasing rolling process in real time. While saving production costs and improving production efficiency, it effectively controls the thickness of the workpiece, achieving the purpose of improving the accuracy of roll gap calculation during the thickness-increasing rolling process of the metal slab.

[0061] In a second aspect, the present invention provides a device for calculating the roll gap during a metal slab thickness increase rolling process, the device comprising:

[0062] The first parameter determination module is used to determine the roll parameters, the rolled piece parameters and the rolling process parameters according to the target pass rolling process specification data;

[0063] The second parameter determination module is used to establish a velocity field that meets the velocity boundary conditions based on the deformation characteristics of the rolled piece and calculate the target parameters of the metal slab during the thickness increase rolling process; the target parameters include at least the rolling time corresponding to the thickness increase rolling process of the metal slab, the rolling zone inclination angle, the distance of the thickness increase rolling deformation zone exit position from the roller centerline, the distance of the thickness increase rolling deformation zone entrance position from the roller centerline, and the deformation resistance of the deformation zone;

[0064] A module for determining the rolling force in the deformation zone, which is used to obtain the minimum value of the total power functional at any time during the rolling process of the metal slab with increasing thickness based on the internal deformation power, friction power and shear power at any time during the rolling process of the metal slab with increasing thickness, and calculate the rolling force in the deformation zone at any time during the rolling process of the metal slab with increasing thickness;

[0065] The roll gap calculation module is used to calculate the roll gap calculation value during the rolling process of the metal slab thickness increase based on the roll gap spacing and the rolling force in the deformation zone.

[0066] In a third aspect, the present invention provides a device for calculating the roll gap during a metal slab thickness increase rolling process, the device comprising:

[0067] A memory, a processor, and a communication interface coupled to the processor; the memory stores a computer program that can be run by the processor; when the processor runs the computer program, it executes the above-mentioned method for calculating the roll gap during the metal slab thickness increase rolling process.

[0068] The technical effects achieved by the device-type solutions provided in the second aspect and the equipment-type solutions provided in the third aspect are the same as those achieved by the method-type solutions provided in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0070] Figure 1 A schematic flow chart of a method for calculating the roll gap during the thickness increase rolling process of a metal slab provided by the present invention;

[0071] Figure 2 Schematic diagram of the structure of the bite zone during the thickness increase rolling process of the metal slab in an embodiment of the present invention;

[0072] Figure 3 This is a schematic diagram showing that the thickness of the metal slab is increased by one quarter of the rolled product in an embodiment of the present invention;

[0073] Figure 4 Schematic diagram of steel plate thickness changing with time in an embodiment of the present invention;

[0074] Figure 5 Schematic diagram of the variation of measured and calculated rolling force values ​​over time in an embodiment of the present invention;

[0075] Figure 6 Schematic diagram of the change of the calculated roll gap value over time in an embodiment of the present invention;

[0076] Figure 7 A schematic diagram of the structure of a device for calculating the roll gap during the thickness increase rolling process of a metal slab provided by the present invention;

[0077] Figure 8 This is a schematic structural diagram of the roll gap calculation device for the metal slab thickness increase rolling process provided by the present invention. DETAILED DESCRIPTION

[0078] To facilitate a clear description of the technical solutions of the embodiments of the present invention, the words "first" and "second" are used in the embodiments of the present invention to distinguish between identical or similar items with substantially the same functions and effects. For example, the first threshold and the second threshold are merely used to distinguish between different thresholds and do not limit their order. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or execution order, and the words "first" and "second" do not necessarily mean different.

[0079] It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0080] In the present invention, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or plural.

[0081] The present invention uses a new rolling mathematical calculation method to accurately pre-set the rolling force and roll gap during the rolling process, thereby improving the calculation accuracy. Next, the solution provided in the embodiment of this specification is described in conjunction with the accompanying drawings:

[0082] like Figure 1 As shown, the process may include the following steps:

[0083] Step 110: Determine roll parameters, workpiece parameters, and rolling process parameters according to the target pass rolling process specification data.

[0084] Roll parameters may include original roller radius, roller linear speed, roller upward speed, roller Poisson's ratio, and roller elastic modulus.

[0085] The rolling material parameters may include the initial temperature of the rolling material, the width of the rolling material, and the thickness of the rolling material.

[0086] The rolling process parameters may include the entry speed of the workpiece during the rolling process, the length of the rolling zone where the thickness of the workpiece increases, the thickness of the thick zone of the workpiece, the thickness of the thin zone of the workpiece, and the friction factor between the roller and the workpiece during the rolling process.

[0087] Step 120: According to the deformation characteristics of the rolled piece, a velocity field that meets the velocity boundary conditions is established, and target parameters during the thickness increase rolling process of the metal slab are calculated.

[0088] The target parameters may at least include the rolling time corresponding to the thickness increase rolling process of the metal slab, the inclination angle of the rolling zone, the distance from the exit position of the thickness increase rolling deformation zone to the center line of the rolls, the distance from the entrance position of the thickness increase rolling deformation zone to the center line of the rolls, and the deformation resistance of the deformation zone.

[0089] When implementing step 120, the following steps may be specifically included:

[0090] According to the velocity boundary conditions and volume invariance conditions of the deformation zone, the velocity field and strain velocity field of the rolling deformation zone that meet the motion permission conditions are established;

[0091] The rolling time and rolling zone inclination angle corresponding to the thickness increase rolling process of the metal slab are determined by the roller upward movement speed, the length of the rolling zone where the thickness of the rolled piece is increased, the thickness of the thick zone and the thickness of the thin zone of the rolled piece;

[0092] Calculate the distance between the exit position of the thickness increase rolling deformation zone and the centerline of the rolls, as well as the distance between the entrance position of the thickness increase rolling deformation zone and the centerline of the rolls;

[0093] The deformation resistance of the deformation zone of the metal sheet is calculated based on the rolled material and rolling process parameters.

[0094] Step 130: Based on the internal deformation power, friction power and shear power at any time during the thickness increase rolling process of the metal slab, the minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab is calculated.

[0095] Step 130 may include:

[0096] Calculating the internal deformation power, friction power and shear power at any time during the rolling process of the metal slab thickness increase based on the deformation resistance;

[0097] The total power functional is calculated based on the internal deformation power, friction power and shear power;

[0098] According to the total power functional corresponding to different neutral angles, the minimum value of the total power functional at any time is obtained;

[0099] Based on the relationship between the total power functional and the rolling force, the rolling force in the deformation zone at any time during the rolling process of the metal slab with increasing thickness is calculated.

[0100] Step 140: Calculate the roll gap calculation value during the metal slab thickness increase rolling process based on the roll gap distance and the rolling force in the deformation zone.

[0101] Figure 1 The method in the invention determines the roll parameters, the workpiece parameters, and the rolling process parameters according to the target pass rolling process specification data; establishes a velocity field that satisfies the velocity boundary conditions based on the deformation characteristics of the workpiece, and calculates the target parameters during the thickness increase rolling process of the metal slab; obtains the minimum value of the total power functional at any time based on the internal deformation power, friction power, and shear power at any time during the thickness increase rolling process of the metal slab, and calculates the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab; calculates the roll gap calculation value during the thickness increase rolling process of the metal slab based on the roll gap spacing and the rolling force in the deformation zone. The solution provided by the present invention is mainly aimed at the roll gap calculation during the thickness increase rolling process of the metal slab, and can calculate the roll gap during the thickness increase rolling process in real time. While saving production costs and improving production efficiency, it well controls the thickness of the workpiece, thereby achieving the purpose of improving the roll gap calculation accuracy during the thickness increase rolling process of the metal slab.

[0102] based on Figure 1 The present specification also provides some specific implementation methods of the method, which are described below.

[0103] Next, in order to further illustrate the specific calculation method of the roll gap calculation process during the metal slab thickness increase rolling process, combined with Figure 2-Figure 3 The structural parameters in are explained:

[0104] Figure 2 Schematic diagram of the structure of the bite zone during the thickness increase rolling process of the metal slab in an embodiment of the present invention; Figure 3 This is a schematic diagram showing that the thickness of the metal slab is increased by one quarter of the rolled product in the embodiment of the present invention. Figure 2-3 As shown in , the various parameters are marked in the structure.

[0105] Optionally, based on the velocity boundary conditions and volume invariance conditions of the deformation zone, a velocity field and a strain velocity field of the rolling deformation zone that meet the motion permission conditions are established, which may specifically include:

[0106] Using formula (1):

[0107] (1)

[0108] Calculate the velocity field in the rolling deformation zone; where, is the velocity component in the length direction of the rolled piece, is the entry speed of the rolled piece, are the undetermined parameters under different production conditions, is the thickness of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the roller upward moving speed, is the roller flattening radius, is the angle between the line from the contact point at the entrance of the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls at any time, It is the angle between the line connecting any point in the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls. is the velocity component in the width direction of the rolled piece, is the velocity component in the thickness direction of the rolled piece, , Indicates the width direction of the rolled piece. Indicates the thickness direction of the rolled piece;

[0109] Using formula (2):

[0110] (2)

[0111] Calculate the strain velocity field in the rolling deformation zone; where, is the strain rate component in the longitudinal direction of the rolled piece, is the strain rate component in the width direction of the rolled piece, is the strain rate component in the thickness direction of the rolled piece.

[0112] Optionally, the rolling time and the rolling zone inclination angle corresponding to the thickness increase rolling process of the metal slab are determined based on the roller upward movement speed, the length of the rolling zone where the thickness of the rolled piece is increased, the thickness of the thick zone and the thickness of the thin zone of the rolled piece, specifically including:

[0113] Substitute the roller upward speed, the thickness of the thick area and the thickness of the thin area of ​​the rolled product into formula (3):

[0114] (3)

[0115] The rolling time corresponding to the thickness increase of the metal slab during the rolling process is calculated; wherein, is the thickness of the thick area of ​​the rolled piece, is the thickness of the thin area of ​​the rolled piece, is the roller upward movement speed;

[0116] Substitute the thickness of the rolled piece plus the length of the rolling zone, the thickness of the thick zone of the rolled piece, and the thickness of the thin zone of the rolled piece into formula (4):

[0117] (4)

[0118] The rolling zone inclination angle corresponding to the rolling process of the metal slab thickness increase is calculated; wherein, Increase the length of the rolling zone for the thickness of the rolled product.

[0119] Optionally, calculating the distance between the exit position of the thickness-increasing rolling deformation zone and the distance between the entrance position of the thickness-increasing rolling deformation zone and the centerline of the rolls may specifically include:

[0120] Using formulas (5)-(8):

[0121] (5)

[0122] (6)

[0123] (7)

[0124] (8)

[0125] Calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls; The distance from the roller centerline to increase the thickness of the rolling deformation zone entrance position is To increase the thickness, the distance of the exit position of the rolling deformation zone deviates from the center line of the rolls. is the thickness of the deformation zone outlet at any time, is the thickness of the thin area of ​​the rolled piece, is the roller upward moving speed, is any moment during the rolling time, is the gap between the rollers, is the roller flattening radius, is the inclination angle of the rolling zone, is the thickness of the rolled piece;

[0126] The calculation of the deformation resistance of the deformation zone of the metal sheet according to the rolled material and rolling process parameters specifically includes:

[0127] Using formula (9):

[0128] ;

[0129] Calculate the deformation resistance of the metal sheet deformation zone; where, is the deformation resistance of the metal sheet deformation zone, For T=1000℃, , The deformation resistance of metal, 、 、 、 、 、 is the preset material coefficient related to the deformation condition, is the initial temperature of the rolled piece, is the average deformation velocity.

[0130] Optionally, based on the internal deformation power, friction power, and shear power at any time during the rolling process of the metal slab with increased thickness, a minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the rolling process of the metal slab with increased thickness is calculated, specifically including:

[0131] Using formula (10):

[0132] (10)

[0133] Calculate the minimum value of the total power functional at any time; where, is the total power functional, is the neutral angle, is the internal deformation power, is the shear power, is the friction power;

[0134] Using formula (11):

[0135] (11)

[0136] The rolling force in the deformation zone at any time during the rolling process of the metal slab thickness increase is calculated as follows:

[0137] (12)

[0138] in, is the force arm coefficient, is the roller linear speed, is the original radius of the roller, is the velocity component in the width direction of the rolled piece.

[0139] Optionally, the thickness of the metal slab is increased by calculating the roll gap value during the rolling process according to the roll gap distance and the rolling force in the deformation zone, specifically including:

[0140] Using formula (13):

[0141] (13)

[0142] Calculate the thickness of the metal slab by adding the roll gap calculation value during the rolling process; where, is the gap between the rollers, is the rolling force in the deformation zone.

[0143] Next, for the above scheme, taking the thickness increase rolling of Q235 carbon structural steel as an example, the process of calculating the roll gap by applying the method of the present invention is specifically described:

[0144] In step 110, the roll parameters, workpiece parameters and rolling process parameters may be:

[0145] Roller parameters: original roller radius , Roller linear speed , Roller upward speed , Poisson's ratio of the roll , roller elastic modulus .

[0146] Rolling parameters: initial temperature of rolling , rolled piece width , thickness of rolled product ;

[0147] Rolling process parameters: the entry speed of the rolled piece during the rolling process , the thickness of the rolled product increases the length of the rolling zone , Thickness of thick area of ​​rolled piece , thin area thickness , the friction factor between the roll and the workpiece during the rolling process .

[0148] Figure 4 FIG. 1 is a schematic diagram showing the change of the thickness of the steel plate over time in an embodiment of the present invention. Figure 4 As shown in the figure, the thickness of the steel plate is related to time. Within a certain time range (for example, 0.5s~1.5s), the thickness of the steel plate increases evenly as the rolling process proceeds.

[0149] Optionally, in step 120, the values ​​of the relevant parameters are substituted into formulas (3) and (4), and the total rolling time is calculated from the roller upward movement speed, the thickness increase rolling zone length, the thickness of the thick zone of the rolled piece, and the thickness of the thin zone. and rolling zone inclination :

[0150] ;

[0151] ;

[0152] Substitute the parameters into formulas (5)-(8) to calculate the distance between the entrance of the deformation zone and the centerline of the rolls. The distance between the exit of the deformation zone and the centerline of the rolls :

[0153] ;

[0154] ;

[0155] ;

[0156] ;

[0157] Substituting the parameters into formula (9) can calculate the deformation resistance of the metal sheet deformation zone: .

[0158] Optionally, the internal deformation power, friction power, and shear power at any time during the rolling process are calculated separately to obtain the total power functional, as shown in formula (14):

[0159] Internal deformation power: (14)

[0160] in, is the deformation resistance of the metal sheet deformation zone, is the distance between the entrance of the deformation zone and the centerline of the rolls, is the distance between the outlet of the deformation zone and the centerline of the rolls, is the width of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the largest strain rate component in the three directions, is the smallest strain rate component in the three directions.

[0161] The shear power is calculated using formula (15): (15)

[0162] in, is the deformation resistance of the metal sheet deformation zone, is the thickness of the rolled piece, is the width of the rolled piece, is the thickness of the deformation zone outlet at any time, 、 are the velocity components in the width and thickness directions of the rolled piece, is the distance between the entrance of the deformation zone and the centerline of the rolls, is the distance between the outlet of the deformation zone and the centerline of the rolls. As shown in formula (16):

[0163] (16)

[0164] The friction power is calculated using formula (17):

[0165] (17)

[0166] in, 、 are the velocity components of the tangential discontinuity of the workpiece on the roller contact surface along the length and thickness directions, is the roller speed, is the angle between the line connecting any point in the rolling deformation zone and the center of the roll and the line connecting the centers of the rolls, are the undetermined parameters under different production conditions, is the thickness of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the roller upward moving speed, is the roller flattening radius, is the angle between the line connecting the contact point at the entrance of the rolling deformation zone and the center of the roll and the line connecting the centers of the rolls at any time, is the friction factor, is the deformation resistance of the metal sheet deformation zone, is the distance between the entrance of the deformation zone and the centerline of the rolls, is the distance between the outlet of the deformation zone and the centerline of the rolls, is the width of the rolled piece.

[0167] Calculate the rolling force in the deformation zone at any time during the rolling process , the specific method is:

[0168] Depend on The minimum value of the total power functional at any time can be obtained.

[0169] in, is the total power functional, is the neutral angle, is the internal deformation power, is the shear power, is the friction power.

[0170] ;

[0171] ;

[0172] Calculate the thickness of the metal slab and the roll gap during rolling :

[0173] ;

[0174] Through the convergence condition between the roller flattening radius and the rolling force, an iterative calculation is performed to obtain the rolling force that meets the change conditions. The specific method is:

[0175] ;

[0176] ;

[0177] in, is the roller flattening radius, is the original radius of the roller, is the Poisson's ratio of the roll, is the elastic modulus of the roller, is the width of the rolled piece, is the thickness of the rolled piece, is the thickness of the deformation zone outlet at any time, For the The roller radius of the iteration, For the The roller radius for the iteration.

[0178] The calculation process of the roll gap in the above specific embodiment of the present invention, the calculated rolling force and the measured value are compared. Figure 5 As shown in the figure, the error is within 7%. The roll gap calculated by the method of the present invention is compared with the measured value. Figure 6 As shown, the error is within 1%. Therefore, the technical solution provided by the present invention accurately calculates the roll gap during thickness-gain rolling in real time, effectively controlling the thickness of the rolled product while saving production costs and improving production efficiency. By establishing a tangent velocity field for thickness-gain rolling of metal slabs, the technical solution of the present invention achieves a roll gap calculation value that is closer to the experimentally measured value. By comprehensively considering various process parameters, the accuracy of roll gap calculation during thickness-gain rolling of metal slabs is improved.

[0179] Based on the same idea, the present invention also provides a device for calculating the roll gap during the thickness increase rolling process of a metal slab. Figure 7 As shown, the device may include:

[0180] A first parameter determination module 710 is used to determine roll parameters, workpiece parameters, and rolling process parameters according to target pass rolling process specification data;

[0181] The second parameter determination module 720 is configured to establish a velocity field that satisfies velocity boundary conditions based on the deformation characteristics of the rolled piece, and calculate target parameters during the thickness increase rolling process of the metal slab; the target parameters include at least the rolling time corresponding to the thickness increase rolling process of the metal slab, the rolling zone inclination angle, the distance from the exit position of the thickness increase rolling deformation zone to the centerline of the rolls, the distance from the entrance position of the thickness increase rolling deformation zone to the centerline of the rolls, and the deformation resistance of the deformation zone;

[0182] a deformation zone rolling force determination module 730 for obtaining a minimum value of a total power functional at any time during the thickness increase rolling process of the metal slab based on the internal deformation power, friction power, and shear power at any time during the thickness increase rolling process of the metal slab, and calculating the deformation zone rolling force at any time during the thickness increase rolling process of the metal slab;

[0183] The roll gap calculation module 740 is used to calculate the roll gap calculation value during the rolling process of the metal slab thickness increase based on the roll gap distance and the rolling force in the deformation zone.

[0184] based on Figure 7 The device may further include some specific implementation units:

[0185] Optionally, the second parameter determination module 720 may specifically include:

[0186] The deformation zone velocity field and strain velocity field calculation unit is used to establish the velocity field and strain velocity field of the rolling deformation zone that meet the motion permission conditions according to the velocity boundary conditions and volume invariance conditions of the deformation zone;

[0187] A rolling time and rolling zone inclination calculation unit is used to determine the rolling time and rolling zone inclination corresponding to the thickness increase rolling process of the metal slab based on the roller upward movement speed, the length of the rolling zone increased by the thickness of the rolled piece, the thickness of the thick zone and the thickness of the thin zone of the rolled piece;

[0188] A distance calculation unit is used to calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls;

[0189] The deformation resistance calculation unit is used to calculate the deformation resistance of the deformation zone of the metal sheet according to the rolled material and rolling process parameters.

[0190] The deformation zone rolling force determination module 730 may specifically include:

[0191] an internal deformation power, friction power and shear power calculation unit, for calculating the internal deformation power, friction power and shear power at any moment during the thickness increase rolling process of the metal slab based on the deformation resistance;

[0192] A total power functional calculation unit is used to calculate the total power functional based on the internal deformation power, friction power and shear power;

[0193] A minimum value calculation unit of the total power functional is used to obtain the minimum value of the total power functional at any time based on the total power functionals corresponding to different neutral angles;

[0194] The deformation zone rolling force calculation unit is used to calculate the deformation zone rolling force at any time during the thickness increase rolling process of the metal slab based on the relationship between the total power functional and the rolling force.

[0195] Optionally, the deformation zone velocity field and strain velocity field calculation unit can be used to:

[0196] Using the formula:

[0197] ;

[0198] Calculate the velocity field in the rolling deformation zone; where, is the velocity component in the length direction of the rolled piece, is the entry speed of the rolled piece, are the undetermined parameters under different production conditions, is the thickness of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the roller upward moving speed, is the roller flattening radius, is the angle between the line from the contact point at the entrance of the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls at any time, It is the angle between the line connecting any point in the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls. is the velocity component in the width direction of the rolled piece, is the velocity component in the thickness direction of the rolled piece, , Indicates the width direction of the rolled piece. Indicates the thickness direction of the rolled piece;

[0199] Using the formula:

[0200] ;

[0201] Calculate the strain velocity field in the rolling deformation zone; where, is the strain rate component in the length direction of the rolled piece, is the strain rate component in the width direction of the rolled piece, is the strain rate component in the thickness direction of the rolled piece.

[0202] Optionally, the rolling time and rolling zone inclination calculation unit may be specifically used for:

[0203] Substitute the roller upward speed, the thickness of the thick area and the thickness of the thin area of ​​the rolled product into the formula:

[0204] ;

[0205] The rolling time corresponding to the thickness increase of the metal slab during the rolling process is calculated; wherein, is the thickness of the thick area of ​​the rolled piece, is the thickness of the thin area of ​​the rolled piece, is the roller upward movement speed;

[0206] Substitute the thickness of the rolled piece plus the length of the rolling zone, the thickness of the thick zone of the rolled piece, and the thickness of the thin zone into the formula:

[0207] ;

[0208] The rolling zone inclination angle corresponding to the rolling process of the metal slab thickness increase is calculated; wherein, Increase the length of the rolling zone for the thickness of the rolled product.

[0209] Optionally, the distance calculation unit can be used to:

[0210] Using the formula:

[0211] ;

[0212] ;

[0213] ;

[0214] ;

[0215] Calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls; The distance from the roller centerline to increase the thickness of the rolling deformation zone entrance position is To increase the thickness, the distance of the exit position of the rolling deformation zone deviates from the center line of the rolls. is the thickness of the deformation zone outlet at any time, is the thickness of the thin area of ​​the rolled piece, is the roller upward moving speed, is any moment during the rolling time, is the gap between the rollers, is the roller flattening radius, is the inclination angle of the rolling zone, is the thickness of the rolled piece;

[0216] The deformation resistance calculation unit can be used for:

[0217] Using the formula:

[0218] ;

[0219] Calculate the deformation resistance of the metal sheet deformation zone; where, is the deformation resistance of the metal sheet deformation zone, For T=1000℃, , The deformation resistance of metal, 、 、 、 、 、 is the preset material coefficient related to the deformation condition, is the initial temperature of the rolled piece, is the average deformation velocity.

[0220] Optionally, the deformation zone rolling force determination module 730 may be specifically used to:

[0221] Using the formula:

[0222] ;

[0223] Calculate the minimum value of the total power functional at any time; where, is the total power functional, is the neutral angle, is the internal deformation power, is the shear power, is the friction power;

[0224] Using the formula:

[0225] ;

[0226] Calculate the rolling force in the deformation zone at any moment during the rolling process of the metal slab with increasing thickness;

[0227] ;

[0228] in, is the force arm coefficient, is the roller linear speed, is the original radius of the roller, is the velocity component in the width direction of the rolled piece.

[0229] Optionally, the roll gap calculation module 740 may be specifically used to:

[0230] Using the formula:

[0231] ;

[0232] Calculate the thickness of the metal slab by adding the roll gap calculation value during the rolling process; where, is the gap between the rollers, is the rolling force in the deformation zone.

[0233] Based on the same idea, the embodiment of this specification also provides a device for calculating the roll gap during the thickness increase rolling process of a metal slab. Figure 8 As shown, this may include:

[0234] A memory, a processor, and a communication interface coupled to the processor; the memory stores a computer program that can be run by the processor; when the processor runs the computer program, the aforementioned method for calculating the roll gap during the thickness increase rolling process of the metal sheet is executed. Figure 8 As shown, the terminal device may further include a communication line. The communication line may include a path to transmit information between the components. Figure 8 As shown, the terminal device may further include a memory. The memory is used to store computer-executable instructions for executing the solution of the present invention, and the execution is controlled by the processor. The processor is used to execute the computer-executable instructions stored in the memory, thereby implementing the method provided by the embodiment of the present invention.

[0235] In a specific implementation, as an embodiment, Figure 8 As shown, the processor may include one or more CPUs, such as Figure 8 In the specific implementation, as an embodiment, as Figure 8 As shown, the terminal device may include multiple processors, such as Figure 8 Each of these processors can be a single-core processor or a multi-core processor.

[0236] The above description primarily describes the solutions provided by the embodiments of the present invention from the perspective of the interactions between the various modules. It will be understood that, to implement the aforementioned functions, each module includes hardware structures and / or software units corresponding to the functions. Those skilled in the art will readily appreciate that, in conjunction with the various exemplary units and algorithmic steps described in the embodiments disclosed herein, the present invention can be implemented in hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the present invention. In the above embodiments, implementation may be in whole or in part through software, hardware, firmware, or any combination thereof. When implemented using software, implementation may be in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are fully or partially executed. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a terminal, a user equipment, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium accessible by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disc (DVD); or a semiconductor medium, such as a solid state drive (SSD).

[0237] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may implement several functions listed in the claims. The fact that certain measures are recorded in mutually different dependent claims does not mean that these measures cannot be combined to produce good results.

[0238] Although the present invention has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely illustrative of the invention as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. It will be apparent that various modifications and variations may be made to the present invention by those skilled in the art without departing from the spirit and scope of the invention. Thus, the present invention is intended to include such modifications and variations as fall within the scope of the claims of the present invention and their equivalents.

Claims

1. A method for calculating the roll gap during the rolling process of a metal sheet, characterized in that: include: Determine the roll parameters, workpiece parameters and rolling process parameters according to the target pass rolling process specification data; According to the deformation characteristics of the rolled piece, a velocity field that satisfies the velocity boundary conditions is established, and target parameters in the thickness increase rolling process of the metal slab are calculated; the target parameters include at least the rolling time corresponding to the thickness increase rolling process of the metal slab, the rolling zone inclination angle, the distance of the exit position of the thickness increase rolling deformation zone from the center line of the rolls, the distance of the entrance position of the thickness increase rolling deformation zone from the center line of the rolls, and the deformation resistance of the deformation zone; Based on the internal deformation power, friction power and shear power at any time during the thickness increase rolling process of the metal slab, the minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab is calculated; Calculate the roll gap value during the rolling process of the metal slab thickness increase according to the roll gap distance and the rolling force in the deformation zone; According to the deformation characteristics of the rolled piece, a velocity field that meets the velocity boundary conditions is established, including: Using the formula: ; Calculate the velocity field in the rolling deformation zone; where, is the velocity component in the length direction of the rolled piece, is the entry speed of the rolled piece, are the undetermined parameters under different production conditions, is the thickness of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the roller upward moving speed, is the roller flattening radius, is the angle between the line from the contact point at the entrance of the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls at any time, It is the angle between the line connecting any point in the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls. is the velocity component in the width direction of the rolled piece, is the velocity component in the thickness direction of the rolled piece, , Indicates the width direction of the rolled piece. Indicates the thickness direction of the rolled piece; Using the formula: ; Calculate the strain velocity field in the rolling deformation zone; where, is the strain rate component in the length direction of the rolled piece, is the strain rate component in the width direction of the rolled piece, is the strain rate component in the thickness direction of the rolled piece.

2. The method for calculating the roll gap during the thickness increase rolling process of a metal sheet according to claim 1, characterized in that: According to the deformation characteristics of the rolled piece, a velocity field that meets the velocity boundary conditions is established to calculate the target parameters during the thickness increase rolling process of the metal slab, including: According to the velocity boundary conditions and volume invariance conditions of the deformation zone, the velocity field and strain velocity field of the rolling deformation zone that meet the motion permission conditions are established; The rolling time and rolling zone inclination angle corresponding to the thickness increase rolling process of the metal slab are determined by the roller upward movement speed, the length of the rolling zone where the thickness of the rolled piece is increased, the thickness of the thick zone and the thickness of the thin zone of the rolled piece; Calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls; The deformation resistance of the deformation zone of the metal sheet is calculated based on the rolled material and rolling process parameters.

3. The method for calculating the roll gap during the thickness increase rolling process of a metal sheet according to claim 1, characterized in that: Based on the internal deformation power, friction power, and shear power at any time during the thickness increase rolling process of the metal slab, the minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab is calculated, specifically including: Calculating the internal deformation power, friction power and shear power at any time during the rolling process of the metal slab thickness increase based on the deformation resistance; The total power functional is calculated based on the internal deformation power, friction power and shear power; According to the total power functional corresponding to different neutral angles, the minimum value of the total power functional at any time is obtained; Based on the relationship between the total power functional and the rolling force, the rolling force in the deformation zone at any time during the rolling process of the metal slab with increasing thickness is calculated.

4. The method for calculating the roll gap during the thickness increase rolling process of a metal sheet according to claim 2, characterized in that: The rolling time and rolling zone inclination angle corresponding to the thickness increase rolling process of the metal slab are determined by the roll upward movement speed, the length of the rolling zone where the thickness of the rolled piece is increased, the thickness of the thick zone of the rolled piece, and the thickness of the thin zone of the rolled piece. Specifically, the rolling time and rolling zone inclination angle include: Substitute the roller upward speed, the thickness of the thick area and the thickness of the thin area of ​​the rolled product into the formula: ; The rolling time corresponding to the thickness increase of the metal slab during the rolling process is calculated; wherein, is the thickness of the thick area of ​​the rolled piece, is the thickness of the thin area of ​​the rolled piece, is the roller upward movement speed; Substitute the thickness of the rolled piece plus the length of the rolling zone, the thickness of the thick zone of the rolled piece, and the thickness of the thin zone into the formula: ; The rolling zone inclination angle corresponding to the rolling process of the metal slab thickness increase is calculated; wherein, Increase the length of the rolling zone for the thickness of the rolled product.

5. The method for calculating the roll gap during the thickness increase rolling process of a metal sheet according to claim 2, characterized in that: Calculate the distance between the exit position of the thickness increase rolling deformation zone and the centerline of the rolls, as well as the distance between the entrance position of the thickness increase rolling deformation zone and the centerline of the rolls, specifically including: Using the formula: ; ; ; ; Calculate the distance between the exit position of the thickness increase rolling deformation zone and the center line of the rolls, and the distance between the entrance position of the thickness increase rolling deformation zone and the center line of the rolls; The distance from the roller centerline to increase the thickness of the rolling deformation zone entrance position is To increase the thickness, the distance of the exit position of the rolling deformation zone deviates from the center line of the rolls. is the thickness of the deformation zone outlet at any time, is the thickness of the thin area of ​​the rolled piece, is the roller upward moving speed, is any time during the rolling time, is the gap between the rollers, is the roller flattening radius, is the inclination angle of the rolling zone, is the thickness of the rolled piece; The deformation resistance of the metal sheet deformation zone is calculated based on the rolled material and rolling process parameters, including: Using the formula: ; Calculate the deformation resistance of the metal sheet deformation zone; where, is the deformation resistance of the metal sheet deformation zone, for T =1000℃, , The deformation resistance of metal, 、 、 、 、 、 is the preset material coefficient related to the deformation condition, is the initial temperature of the rolled piece, is the average deformation velocity.

6. The method for calculating the roll gap during the thickness increase rolling process of a metal sheet according to claim 5, characterized in that: Based on the internal deformation power, friction power, and shear power at any time during the thickness increase rolling process of the metal slab, the minimum value of the total power functional at any time is obtained, and the rolling force in the deformation zone at any time during the thickness increase rolling process of the metal slab is calculated, specifically including: Using the formula: ; Calculate the minimum value of the total power functional at any time; where, is the total power functional, is the neutral angle, is the internal deformation power, is the shear power, is the friction power; Using the formula: ; Calculate the rolling force in the deformation zone at any moment during the rolling process of the metal slab with increasing thickness; ; in, is the force arm coefficient, is the roller linear speed, is the original radius of the roller, is the velocity component in the width direction of the rolled piece.

7. The method for calculating the roll gap during the thickness increase rolling process of a metal sheet according to claim 6, characterized in that: According to the roll gap distance and the rolling force in the deformation zone, the roll gap calculation value of the metal slab thickness increase during the rolling process is calculated, specifically including: Using the formula: ; Calculate the thickness of the metal slab by adding the roll gap calculation value during the rolling process; where, is the gap between the rollers, is the rolling force in the deformation zone, is the rolling mill stiffness.

8. A device for calculating the roll gap during the thickness increase rolling process of a metal sheet, characterized in that: The device includes: The first parameter determination module is used to determine the roll parameters, the rolled piece parameters and the rolling process parameters according to the target pass rolling process specification data; The second parameter determination module is used to establish a velocity field that meets the velocity boundary conditions based on the deformation characteristics of the rolled piece and calculate the target parameters of the metal slab during the thickness increase rolling process; the target parameters include at least the rolling time corresponding to the thickness increase rolling process of the metal slab, the rolling zone inclination angle, the distance of the thickness increase rolling deformation zone exit position from the roller centerline, the distance of the thickness increase rolling deformation zone entrance position from the roller centerline, and the deformation resistance of the deformation zone; A module for determining the rolling force in the deformation zone, which is used to obtain the minimum value of the total power functional at any time during the rolling process of the metal slab with increasing thickness based on the internal deformation power, friction power and shear power at any time during the rolling process of the metal slab with increasing thickness, and calculate the rolling force in the deformation zone at any time during the rolling process of the metal slab with increasing thickness; Roll gap calculation module, used to calculate the roll gap value during the rolling process of the metal slab thickness increase based on the roll gap spacing and the rolling force in the deformation zone; According to the deformation characteristics of the rolled piece, a velocity field that meets the velocity boundary conditions is established, including: Using the formula: ; Calculate the velocity field in the rolling deformation zone; where, is the velocity component in the length direction of the rolled piece, is the entry speed of the rolled piece, are the undetermined parameters under different production conditions, is the thickness of the rolled piece, is the thickness of the rolled piece at any position in the deformation zone, is the roller upward moving speed, is the roller flattening radius, is the angle between the line from the contact point at the entrance of the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls at any time, It is the angle between the line connecting any point in the rolling deformation zone to the center of the roll and the line connecting the centers of the rolls. is the velocity component in the width direction of the rolled piece, is the velocity component in the thickness direction of the rolled piece, , Indicates the width direction of the rolled piece. Indicates the thickness direction of the rolled piece; Using the formula: ; Calculate the strain velocity field in the rolling deformation zone; where, is the strain rate component in the longitudinal direction of the rolled piece, is the strain rate component in the width direction of the rolled piece, is the strain rate component in the thickness direction of the rolled piece.

9. A device for calculating the roll gap during the rolling process of a metal sheet, characterized in that: include: a memory, a processor, and a communication interface coupled to the processor; The memory stores a computer program executable by the processor; When the processor runs the computer program, it executes the method for calculating the roll gap in the metal sheet thickness increasing rolling process according to any one of claims 1 to 7.

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