Roll gap setting method, device and equipment in rolling and thinning process of thick plate

Abstract

The invention discloses a roll gap setting method, device and equipment in the rolling and thinning process of a thick plate, relates to the technical field of metal rolling, and aims to solve the problem of low roll gap setting precision in the rolling and thinning process of the thick plate in the prior art. Comprising the steps that rolled piece parameters, rolling technological parameters and rolling mill parameters are determined according to technological procedure data of the thick plate rolling thinning process; calculating rolling area parameters and deformation area parameters in the steel plate thinning process according to the determined parameters; according to the deformation characteristics of the rolled piece, the total power functional at any moment and the rolling force of a deformation area are calculated; and according to the rolling mill rigidity, the roll gap theoretical value and the rolling force of the deformation area at any moment, the set value of the roll gap in the thinning process is obtained. The method is mainly used for controlling the roll gap distance in the rolling and thinning process of the thick plate, the rolling force and the roll gap can be accurately set through the specific calculation method, and the setting precision of the roll gap is improved.

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 setting a roll gap in a thick plate rolling thinning process. Background Art

[0002] Thick plate rolling is an important part of steel production, which gradually reduces the thickness of the billet through multiple rolling passes to finally reach the required finished product thickness. Its finished products include medium and thick plates, extra-thick plates and extra-wide plates, which are widely used in construction engineering, machinery manufacturing, shipbuilding, energy equipment and bridge engineering. As an important branch of thick plates, the side and head and tail of the rolled piece are irregular in shape during the production process, and the shape needs to be trimmed to obtain a rolled piece with smooth four sides, which causes material cutting.

[0003] The MAS (Mizushima Automatic Plan View Pattern Control System) rolling of medium and thick plates uses thinning rolling technology to improve the rectangularity of steel plates and increase the yield rate of rolled products. MAS rolling is divided into a shaping rolling method that controls the side shape of steel plates and a widening rolling method that controls the shape of the head and tail ends of steel plates. When controlling the side shape of steel plates, variable compression is applied to the widening surface with horizontal rollers, and then the rolled product is rotated 90° before rolling, and finally a rolled product with a flat side can be obtained. When controlling the shape of the head and tail ends of steel plates, variable compression is applied to the extension surface during cross rolling, and the rolled product is rotated 90° before rolling, so that the head and tail end cutting can be controlled. After adopting the MAS rolling method, the head and tail cutting loss rate is reduced, the metal recovery rate is improved, and it has obvious economic benefits.

[0004] In the process of thick plate rolling thinning, the accurate setting of the roll gap is crucial to ensure the thickness accuracy and plate shape quality of the steel plate. Therefore, it is urgent to provide a more reliable roll gap setting solution in the process of thick plate rolling thinning. Summary of the invention

[0005] The purpose of the present invention is to provide a method, device and equipment for setting the roll gap during the thinning process of thick plate rolling, so as to solve the problem of low roll gap setting accuracy during the thinning process of thick plate rolling in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a method for setting a roll gap in a thick plate rolling thinning process, the method comprising: According to the process data of thick plate rolling thinning, the parameters of rolled product, rolling process parameters and rolling mill parameters are determined; Calculate the rolling zone parameters and the deformation zone parameters during the process of the steel plate thinning according to the rolling process parameters, the rolled piece parameters and the rolling mill parameters; the rolling zone parameters include at least the inclination angle of the rolling zone, and the deformation zone parameters include at least the deformation resistance of the deformation zone during the thinning process and the total rolling time of the deformation zone. Calculate the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the rolled piece; the deformation characteristics of the rolled piece include at least the velocity boundary condition of the deformation zone and the volume invariance condition. Obtain the set value of the roll gap during the thinning process according to the rolling mill stiffness, the theoretical value of the roll gap and the rolling force of the deformation zone at any moment.

[0007] Optionally, the rolled piece parameters include at least the thickness of the steel plate and the width of the steel plate; the rolling process parameters include at least the initial temperature of the steel plate, the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, the inlet velocity of the steel plate, the length of the thinning rolling zone of the steel plate, and the friction coefficient between the roll and the steel plate during the rolling process; the rolling mill parameters include at least the rolling mill stiffness, the linear velocity of the roll, the downward movement velocity of the roll, the original radius of the roll, the elastic modulus of the roll, and the Poisson's ratio of the roll. Calculate the rolling zone parameters and the deformation zone parameters during the process of the steel plate thinning according to the rolling process parameters, the rolled piece parameters and the rolling mill parameters, specifically including: Calculate the inclination angle of the thinning rolling zone of the steel plate through the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate and the length of the thinning rolling zone of the steel plate. Determine the deformation resistance of the deformation zone during the thinning process according to the rolled piece parameters and the rolling process parameters. Calculate the total rolling time of the deformation zone according to the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate and the downward movement velocity of the roll. Determine the half thickness at the exit of the deformation zone at any moment, and determine the roll gap between the two rolls based on the half thickness at the exit of the deformation zone at any moment, the flattened radius of the roll and the inclination angle of the rolling zone.

[0008] Optionally, before calculating the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the rolled piece, it further includes: Calculate the distance by which the exit position of the deformation zone deviates from the center line of the rolls according to the flattened radius of the roll, the half thickness at the exit of the deformation zone at any moment and the roll gap between the two rolls. Calculate the distance by which the inlet position of the rolling deformation zone deviates from the center line of the rolls according to the flattened radius of the roll, the thickness of the thick area of the steel plate and the roll gap between the two rolls.

[0009] Optionally, calculating the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the rolled piece specifically includes: Establish a velocity field of the rolling deformation zone that satisfies the kinematically admissible conditions according to the velocity boundary condition of the deformation zone and the volume invariance condition. Determine the unit second flow rate at the entrance of the deformation zone, the average value of the contact angle, and the yield shear stress; Calculate the power of each part and the total power functional at any moment according to the velocity field and the deformation resistance; Calculate the total power functional corresponding to different neutral angles at any moment to obtain the minimum value of the total power functional; Calculate the rolling force in the deformation zone at any moment according to the relationship between the total power functional and the rolling force; Take the rolling force and related parameters in the deformation zone as input data, and perform iterative calculations through the convergence condition between the flattened radius of the roll and the rolling force in the deformation zone to obtain a rolling force model that changes with time.

[0010] Optionally, calculate the inclination angle of the thinning rolling zone of the steel plate through the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the length of the thinning rolling zone of the steel plate. Specifically, it includes: Substitute the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the length of the thinning rolling zone of the steel plate into the formula: ; Calculate the inclination angle of the thinning rolling zone of the steel plate ; where is the half-thickness of the thick zone of the steel plate, is the half-thickness of the thin zone of the steel plate, is the length of the thinning rolling zone of the steel plate; Determine the deformation resistance in the deformation zone during the thinning process according to the workpiece parameters and the rolling process parameters. Specifically, it includes: Substitute the workpiece parameters and the rolling process parameters into the formula: ; Calculate the deformation resistance in the deformation zone during the thinning process ; where is the deformation resistance of the metal at T = 1000 °C, , when is the initial temperature of the steel plate, , , , , , are preset material coefficients related to the deformation conditions, is the average deformation speed, is the half-thickness of the steel plate, is the half-thickness at the exit of the deformation zone at any moment; Calculate the total rolling time in the deformation zone according to the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the downward movement speed of the roll. Specifically, it includes: Substitute the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, and the downward movement speed of the roll into the formula: ; Calculate the total rolling time of the deformation zone ; where is the half-thickness of the thick area of the steel plate, is the half-thickness of the thin area of the steel plate, is the downward movement speed of the roll; Determine the half-thickness at the exit of the deformation zone at any moment, and determine the roll gap between the two rolls based on the half-thickness at the exit of the deformation zone, the flattening radius of the roll, and the inclination angle of the rolling zone. Specifically, it includes: Adopt the formula: ; Calculate the half-thickness at the exit of the deformation zone at any moment , is the half-thickness of the thick area of the steel plate, is the downward movement speed of the roll, is any moment within 0- rolling time; Adopt the formula: ; Calculate half of the roll gap between the two rolls ; where is the flattening radius of the roll.

[0011] Optionally, calculate the distance by which the exit position of the deformation zone deviates from the center line of the rolls based on the flattening radius of the roll, the half-thickness at the exit of the deformation zone at any moment, and the roll gap between the two rolls. Specifically, it includes: According to the flattening radius of the roll, the half-thickness at the exit of the deformation zone at any moment, and the roll gap between the two rolls, adopt the formula: ; Calculate the distance by which the exit position of the deformation zone deviates from the center line of the rolls ; where is the flattening radius of the roll, is half of the roll gap between the two rolls, is the half-thickness at the exit of the deformation zone at any moment; Calculate the distance by which the entrance position of the rolling deformation zone deviates from the center line of the rolls based on the flattening radius of the roll, the thickness of the thick area of the steel plate, and the roll gap between the two rolls. Specifically, it includes: According to the flattening radius of the roll, the thickness of the thick area of the steel plate, and the roll gap between the two rolls, adopt the formula: ; Calculate the distance by which the entrance position of the rolling deformation zone deviates from the center line of the rolls ; where is the half-thickness of the steel plate.

[0012] Optionally, according to the deformation characteristics of the rolled piece, calculate the total power functional at any time and the rolling force in the deformation zone, specifically including: Adopt the formula: ; Calculate the rolling force in the deformation zone ; where ; ; where is the total power functional, is the original radius of the roll, is the force arm coefficient, is the linear velocity of the roll, is the flattened radius of the roll, is the half thickness of the steel plate, is half of the distance between the two rolls, is the half thickness at the exit of the deformation zone at any time, is the downward movement speed of the roll, is the internal deformation power, is the shear power, is the friction power, is the neutral angle, and .

[0013] Compared with the prior art, a roll gap setting method for the thinning process of heavy plate rolling provided by the present invention determines the rolled piece parameters, rolling process parameters, and rolling mill parameters according to the process specification data of the thinning process of heavy plate rolling; calculates the rolling zone parameters and deformation zone parameters during the thinning process of the steel plate according to the determined parameters; calculates the total power functional at any time and the rolling force in the deformation zone according to the deformation characteristics of the rolled piece; and obtains the set value of the roll gap during the thinning process according to the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force in the deformation zone at any time. The present invention mainly aims at the control of the roll gap distance during the thinning process of heavy plate rolling, and the specific calculation method can accurately set the rolling force and the roll gap, improving the accuracy of roll gap setting.

[0014] In the second aspect, the present invention provides a roll gap setting device for the thinning process of heavy plate rolling, and the device includes: A basic parameter determination module, configured to determine the rolled piece parameters, rolling process parameters, and rolling mill parameters according to the process specification data of the thinning process of heavy plate rolling; A rolling zone parameter and deformation zone parameter determination module, configured to calculate the rolling zone parameters and deformation zone parameters during the thinning process of the steel plate according to the rolling process parameters, the rolled piece parameters, and the rolling mill parameters; the rolling zone parameters at least include the rolling zone inclination angle, and the deformation zone parameters at least include the deformation resistance of the deformation zone during the thinning process and the total rolling time of the deformation zone; The rolling force calculation module in the deformation zone is used to calculate the total power functional at any time and the rolling force in the deformation zone according to the deformation characteristics of the rolled piece; the deformation characteristics of the rolled piece at least include the velocity boundary condition in the deformation zone and the volume invariance condition; The set value determination module of the roll gap is used to obtain the set value of the roll gap during the thickness reduction process according to the mill stiffness, the theoretical value of the roll gap, and the rolling force in the deformation zone at any time.

[0015] In a third aspect, the present invention provides a roll gap setting device for the thickness reduction process of heavy plate rolling. The device includes: A memory, a processor, and a communication interface coupled to the processor; a computer program that can be run by the processor is stored on the memory; when the processor runs the computer program, it executes the above-mentioned roll gap setting method for the thickness reduction process of heavy plate rolling.

[0016] In a fourth aspect, the present invention provides a computer storage medium. Instructions are stored in the computer storage medium, and when the instructions are run, the above-mentioned roll gap setting method for the thickness reduction process of heavy plate rolling is implemented.

[0017] The technical effects achieved by the device type solution provided in the second aspect, the equipment type solution provided in the third aspect, and the computer storage medium solution provided in the fourth aspect are the same as those of the method type solution provided in the first aspect, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic 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: Figure 1 It is a schematic flow chart of a roll gap setting method for the thickness reduction process of heavy plate rolling provided by the present invention; Figure 2 It is a schematic diagram of the biting zone structure during the thickness reduction process of MAS rolling in an embodiment of the present invention; Figure 3 It is a quarter schematic diagram of the finished product during the thickness reduction process of MAS rolling in an embodiment of the present invention; Figure 4 It is a schematic diagram of the steel plate after MAS rolling in an embodiment of the present invention; Figure 5 It is a schematic diagram of the measured value and calculated value of the rolling force changing with time in an embodiment of the present invention; Figure 6 It is a schematic diagram of the roll gap set value changing with time in an embodiment of the present invention; Figure 7 It is a schematic diagram of a roll gap setting device for the thickness reduction process of heavy plate rolling provided by the present invention; Figure 8Schematic diagram of a roll gap setting device during the process of thick plate rolling becoming thinner provided by the present invention. Specific embodiments

[0019] For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and roles. For example, the first threshold and the second threshold are only used to distinguish different thresholds and do not limit their order. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and "first" and "second" do not necessarily mean different.

[0020] It should be noted that in the present invention, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, using words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0021] In the present invention, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b or c can represent: 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 and c can be single or multiple.

[0022] Regarding the control of rolling force and the setting of roll gap in MAS rolling, the present invention proposes a method for setting the roll gap during the process of medium-thick plate MAS rolling becoming thinner, which improves the accuracy of roll gap setting and optimizes the technology of medium-thick plate rolling becoming thinner. Next, the solutions provided in the embodiments of this specification will be described with reference to the accompanying drawings: As Figure 1 shown, this process may include the following steps: Step 110: Determine the rolled piece parameters, rolling process parameters, and rolling mill parameters according to the process specification data during the process of thick plate rolling becoming thinner.

[0023] The rolled piece parameters may include the thickness and width of the steel plate; The rolling process parameters may include the initial temperature of the steel plate, the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, the inlet speed of the steel plate, the length of the thinning rolling area of the steel plate, and the friction coefficient between the rolling roll and the steel plate during the rolling process.

[0024] The rolling mill parameters may include the rolling mill stiffness, the linear speed of the rolling roll, the downward movement speed of the rolling roll, the original radius of the rolling roll, the elastic modulus of the rolling roll, and the Poisson's ratio of the rolling roll.

[0025] Step 120: Calculate the rolling area parameters and the deformation area parameters during the thinning process of the steel plate according to the rolling process parameters, the rolled piece parameters, and the rolling mill parameters.

[0026] The rolling area parameters may at least include the inclination angle of the rolling area, and the deformation area parameters may at least include the deformation resistance of the deformation area during the thinning process and the total rolling time of the deformation area.

[0027] Specifically, calculating the rolling area parameters and the deformation area parameters during the thinning process of the steel plate according to the rolling process parameters, the rolled piece parameters, and the rolling mill parameters may specifically include: Calculate the inclination angle of the thinning rolling area of the steel plate through the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, and the length of the thinning rolling area of the steel plate; Determine the deformation resistance of the deformation area during the thinning process according to the rolled piece parameters and the rolling process parameters; Calculate the total rolling time of the deformation area according to the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, and the downward movement speed of the rolling roll; Determine the exit half-thickness of the deformation area at any moment, and determine the roll gap between the two rolling rolls based on the exit half-thickness of the deformation area at any moment, the flattened radius of the rolling roll, and the inclination angle of the rolling area.

[0028] Step 130: Calculate the total power functional at any moment and the rolling force of the deformation area according to the deformation characteristics of the rolled piece.

[0029] The deformation characteristics of the rolled piece may at least include the velocity boundary condition of the deformation area and the volume invariance condition.

[0030] Step 140: Obtain the set value of the roll gap during the thinning process according to the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force of the deformation area at any moment.

[0031] Figure 1The method in [reference] determines the rolled piece parameters, rolling process parameters, and rolling mill parameters based on the process specification data during the process of the thick plate thinning during rolling; calculates the rolling zone parameters and deformation zone parameters during the process of the steel plate thinning according to the determined parameters; calculates the total power functional at any moment and the rolling force in the deformation zone according to the deformation characteristics of the rolled piece; and obtains the set value of the roll gap during the thinning process based on the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force in the deformation zone at any moment. The present invention mainly aims at the control of the roll gap distance during the process of the thick plate thinning during rolling. The specific calculation method can accurately set the rolling force and the roll gap, and improves the accuracy of the roll gap setting.

[0032] Based on Figure 1 the method in [reference], some specific implementation manners of this method are further provided in the embodiments of this specification, and the following is an explanation.

[0033] Figure 1 The corresponding complete implementation steps in [reference] may include: Step 1: Determine the rolled piece parameters, rolling process parameters, and rolling mill parameters based on the process specification data during the process of the thick plate thinning during rolling; Step 2: Calculate the inclination angle of the rolling zone for the steel plate thinning through the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the length of the rolling zone for the steel plate thinning; Step 3: Determine the deformation resistance in the deformation zone during the thinning process according to the rolled piece parameters and the rolling process parameters; Step 4: Calculate the total rolling time in the deformation zone from the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the downward movement speed of the roll; Step 5: Determine the exit half-thickness in the deformation zone at any moment; Step 6: Determine half of the roll gap between the two rolls based on the exit half-thickness in the deformation zone at any moment, the flattened radius of the roll, and the inclination angle of the rolling zone; Step 7: Calculate the distance by which the exit position in the deformation zone deviates from the center line of the rolls according to the flattened radius of the roll, the exit half-thickness in the deformation zone at any moment, and the roll gap between the two rolls; Step 8: Calculate the distance by which the entrance position in the rolling deformation zone deviates from the center line of the rolls according to the flattened radius of the roll, the thickness of the thick zone of the steel plate, and the roll gap between the two rolls; Step 9: Calculate the total power functional at any moment and the rolling force in the rolling deformation zone according to the deformation characteristics of the rolled piece; Step 10: Obtain the set value of the roll gap during the thinning process from the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force in the deformation zone at any moment.

[0034] In the actual implementation process, step 130 may include the following steps: Establish a velocity field of the rolling deformation zone that satisfies the kinematically admissible conditions according to the velocity boundary conditions and volume invariance conditions in the deformation zone; Determine the unit flow rate per second at the entrance of the deformation zone, the average value of the contact angle, and the yield shear stress; Calculate the power of each part and the total power functional at any time according to the velocity field and the deformation resistance; Calculate the total power functional corresponding to different neutral angles at any time, obtain the minimum value of the total power functional, and calculate the rolling force in the deformation zone at any time according to the relationship between the total power functional and the rolling force.

[0035] Take the rolling force and related parameters in the rolling deformation zone as input data, and perform iterative calculations through the convergence condition between the flattened roll radius and the rolling force to obtain the rolling force model that changes with time.

[0036] Next, in order to further illustrate the specific calculation method in the roll gap setting process during the process of the thick plate rolling getting thinner, it is described in combination with Figures 2-4 the structural parameters in Taking the roll gap setting process during the process of the medium and heavy plate MAS rolling getting thinner as an example, Figure 2 is the schematic diagram of the biting zone structure during the process of the MAS rolling getting thinner in the embodiment of the present invention; Figure 3 is the schematic diagram of a quarter of the finished product during the process of the MAS rolling getting thinner in the embodiment of the present invention; Figure 4 is the schematic diagram of the steel plate after the MAS rolling process in the embodiment of the present invention. As Figures 2-4 shown, each parameter is marked in the structure.

[0037] In step 120, the inclination angle of the steel plate thinning rolling zone is calculated by formula (1): (1) where is the half thickness of the thick zone of the steel plate, is the half thickness of the thin zone of the steel plate, is the length of the steel plate thinning rolling zone.

[0038] In the said step 130, the deformation resistance of the deformation zone during the thinning process is calculated by formula (2): (2) where is at T = 1000 °C, , is the deformation resistance of the metal at is the initial temperature of the steel plate, , , , , , are preset material coefficients related to the deformation conditions, is the average deformation speed, is the half thickness of the steel plate, is the half thickness at the exit of the deformation zone at any moment.

[0039] When calculating the total rolling time of the deformation zone use formula (3): (3) where is the half thickness of the thick area of the steel plate, is the half thickness of the thin area of the steel plate, is the downward movement speed of the roll.

[0040] When calculating the half thickness at the exit of the deformation zone at any moment use formula (4): (4) where is the half thickness of the thick area of the steel plate, is the downward movement speed of the roll, is any moment within the rolling time (from moment 0 to moment t0).

[0041] When calculating half of the roll gap between the two rolls use formula (5): (5) where is the half thickness at the exit of the deformation zone at any moment, is the flattened radius of the roll, is the inclination angle of the rolling zone.

[0042] Use formula (6) to calculate the distance by which the exit position of the deformation zone deviates from the center line of the rolls : (6) where is the flattened radius of the roll, is the half thickness at the exit of the deformation zone at any moment, is half of the roll gap between the two rolls.

[0043] Use formula (7) to calculate the distance by which the entrance position of the deformation zone deviates from the center line of the rolls : (7) where is the flattened radius of the roll, is the half thickness of the steel plate, is half of the roll gap between the two rolls.

[0044] Among them, the unit second flow rate at the entrance of the deformation zone , the average contact angle and the yield shear stress Calculate using formulas (8)-(10): (8) (9) (10) Among them, is the roll linear speed, is the roll flattening radius, is the neutral angle, , is the half-width of the steel plate, is the angle between the line connecting the entrance contact point of the rolling deformation zone and the roll center and the roll center line at any moment, is the roll downward movement speed, is the half-thickness of the steel plate, is the distance of the entrance position of the deformation zone deviating from the roll center line, is the distance of the exit position of the deformation zone deviating from the roll center line, is the inclination angle of the steel plate thinning rolling zone, is the deformation resistance of the deformation zone during the thinning process.

[0045] When calculating the power of each part and the total power functional at any moment, first calculate the internal deformation power; The internal deformation power is calculated using formula (11): (11) Among them, is the deformation resistance of the deformation zone during the thinning process, is the unit second flow rate, is the half-thickness of the deformation zone exit at any moment, is a parameter to be determined under different production conditions, is the half-thickness of the steel plate, is the half-width of the steel plate, is the roll downward movement speed, is the roll flattening radius, is the angle between the line connecting the entrance contact point of the rolling deformation zone and the roll center and the roll center line at any moment, is the average value of the deformation zone contact angle, is the inclination angle of the steel plate thinning rolling zone.

[0046] The shear power is calculated using formula (12): (12) Among them, is the yield shear stress, is the half-width of the steel plate, is the half-thickness of the deformation zone exit at any moment, is the inclination angle of the thinning rolling area of the steel plate, is the half thickness of the steel plate, is a parameter to be determined under different production conditions, is the unit second flow rate, is the downward movement speed of the roll, is the flattened radius of the roll, is the angle between the line connecting the entrance contact point of the rolling deformation zone and the roll center at any moment and the roll center line, is the distance by which the exit position of the deformation zone deviates from the roll center line, is the distance by which the entrance position of the deformation zone deviates from the roll center line.

[0047] The friction power is calculated using formula (13): (13) where, is the friction coefficient, is the yield shear stress, is the half width of the steel plate, is the roll linear speed, is the downward movement speed of the roll, is the flattened radius of the roll, is the angle between the line connecting the entrance contact point of the rolling deformation zone and the roll center at any moment and the roll center line, is the neutral angle, is the inclination angle of the thinning rolling area of the steel plate, is the average value of the contact angle in the deformation zone, , is the unit second flow rate, is the half thickness corresponding to the neutral angle, is the average value of the contact angle in the plastic deformation zone during thinning rolling, is a parameter to be determined under different production conditions.

[0048] The total power functional is calculated as formula (14): (14) The minimum value of the total power functional at any moment, the rolling force in the deformation zone at any moment : (15) where, is the total power functional, is the neutral angle, is the internal deformation power, is the shear power, is the friction power.

[0049] (16) (17) Wherein, is the half thickness of the steel plate, is the half thickness at the exit of the deformation zone at any time, is the downward movement speed of the roll, is the linear speed of the roll, is the original radius of the roll, is the total power functional, is the force arm coefficient, is the flattened radius of the roll, is half of the roll gap between the two rolls.

[0050] Rolling force model varying with time: Iterative operation: (18) Convergence condition: (19) Wherein, is the original radius of the roll, is the rolling force, is the Poisson's ratio of the roll, is the elastic modulus of the roll, is the half width of the steel plate, is the th iteration of the roll radius, is the th iteration of the roll radius.

[0051] Set value of the roll gap during the thinning process : (20) Wherein, is half of the roll gap between the two rolls, is the rolling force, is the mill stiffness.

[0052] The present invention aims at the problem of controlling the roll gap distance during the thinning process of heavy plate rolling, and proposes a roll gap setting method with high precision and good reliability, accurately setting the rolling force and the roll gap, comprehensively considering cost and efficiency, reducing the cutting loss rate at the head and tail, improving the metal yield rate, and having obvious economic benefits. The setting of the present invention is accurate and takes a short time, and can calculate in real time the set value of the roll gap during the continuous thinning rolling process; as Figures 5-6 shown, Figure 5 in, it can be seen from the variation of the measured value and the calculated value of the rolling force with time that the measured rolling force is very close to the rolling force calculated by the model of the present invention, and the error is within 7%. Figure 6This is a schematic diagram showing the variation of the roll gap setting value over time in the embodiments of the present invention. The calculated value of the roll gap basically coincides with the measured value, and the error is within five-thousandths. Therefore, the technical solution provided by the present invention improves the roll gap setting accuracy and optimizes the technology of rolling medium and heavy plates to become thinner.

[0053] Based on the same idea, the present invention also provides a roll gap setting device for the process of rolling thick plates to become thinner, as Figure 7 shown. The device may include: A basic parameter determination module 710, configured to determine workpiece parameters, rolling process parameters, and rolling mill parameters according to the process specification data of the process of rolling thick plates to become thinner; A rolling zone parameter and deformation zone parameter determination module 720, configured to calculate the rolling zone parameters and deformation zone parameters during the process of the steel plate becoming thinner according to the rolling process parameters, the workpiece parameters, and the rolling mill parameters; the rolling zone parameters at least include the inclination angle of the rolling zone, and the deformation zone parameters at least include the deformation resistance of the deformation zone during the process of becoming thinner and the total rolling time of the deformation zone; A rolling force calculation module 730 for the deformation zone, configured to calculate the total power functional and the rolling force of the deformation zone at any moment according to the deformation characteristics of the workpiece; the deformation characteristics of the workpiece at least include the velocity boundary condition of the deformation zone and the volume invariance condition; A roll gap setting value determination module 740, configured to obtain the roll gap setting value during the process of becoming thinner according to the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force of the deformation zone at any moment.

[0054] Based on the Figure 7 device, some specific implementation units may also be included: Optionally, the workpiece parameters may at least include the thickness of the steel plate and the width of the steel plate; the rolling process parameters may at least include the initial temperature of the steel plate, the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, the inlet velocity of the steel plate, the length of the rolling area where the steel plate becomes thinner, and the friction coefficient between the rolling roll and the steel plate during the rolling process; the rolling mill parameters may at least include the rolling mill stiffness, the linear velocity of the rolling roll, the downward movement velocity of the rolling roll, the original radius of the rolling roll, the elastic modulus of the rolling roll, and the Poisson's ratio of the rolling roll; The rolling zone parameter and deformation zone parameter determination module 720 may specifically include: A calculation unit for the inclination angle of the rolling area where the steel plate becomes thinner, configured to calculate the inclination angle of the rolling area where the steel plate becomes thinner through the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, and the length of the rolling area where the steel plate becomes thinner; A deformation resistance calculation unit, configured to determine the deformation resistance of the deformation zone during the process of becoming thinner according to the workpiece parameters and the rolling process parameters; A calculation unit for the total rolling time of the deformation zone, configured to calculate the total rolling time of the deformation zone according to the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, and the downward movement velocity of the rolling roll; A roll gap determination unit for determining the half-thickness at the outlet of the deformation zone at any moment and determining the roll gap based on the half-thickness at the outlet of the deformation zone, the flattening radius of the rolls, and the inclination angle of the rolling zone at any moment.

[0055] Optionally, the device may further include: A calculation module for the distance by which the outlet position of the deformation zone deviates from the center line of the rolls, which is used to calculate the distance by which the outlet position of the deformation zone deviates from the center line of the rolls according to the flattening radius of the rolls, the half-thickness at the outlet of the deformation zone at any moment, and the roll gap; A calculation module for the distance by which the inlet position of the deformation zone deviates from the center line of the rolls, which is used to calculate the distance by which the inlet position of the rolling deformation zone deviates from the center line of the rolls according to the flattening radius of the rolls, the thickness of the thick plate area, and the roll gap.

[0056] Optionally, the rolling force calculation module 730 of the deformation zone may specifically be used for: Establishing a velocity field of the rolling deformation zone that satisfies the kinematic admissibility conditions according to the velocity boundary conditions of the deformation zone and the volume invariance condition; Determining the unit flow rate per second at the inlet of the deformation zone, the average value of the contact angle, and the yield shear stress; Calculating the power of each part and the total power functional at any moment according to the velocity field and the deformation resistance; Calculating the total power functional corresponding to different neutral angles at any moment to obtain the minimum value of the total power functional; Calculating the rolling force of the deformation zone at any moment according to the relationship between the total power functional and the rolling force; Taking the rolling force and related parameters of the deformation zone as input data, and performing iterative calculations through the convergence condition between the flattening radius of the rolls and the rolling force of the deformation zone to obtain a rolling force model that changes with time.

[0057] Optionally, the inclination angle calculation unit of the thinning rolling zone of the steel plate may specifically be used for: Substituting the thickness of the thick plate area of the steel plate, the thickness of the thin plate area of the steel plate, and the length of the thinning rolling zone of the steel plate into the formula: ; Calculating the inclination angle of the thinning rolling zone of the steel plate ; where is the half-thickness of the thick plate area, is the half-thickness of the thin plate area, is the length of the thinning rolling zone of the steel plate; The deformation resistance calculation unit may specifically be used for: Substituting the workpiece parameters and the rolling process parameters into the formula: ; Calculating the deformation resistance of the deformation zone during the thinning process ; wherein, is T = 1000 °C, , is the deformation resistance of the metal at this time, is the initial temperature of the steel plate, , , , , , are preset material coefficients related to the deformation conditions, is the average deformation speed, is the half-thickness of the steel plate, is the half-thickness of the outlet of the deformation zone at any time; The total rolling time calculation unit of the deformation zone can specifically be used for: Substituting the thickness of the thick area of the steel plate, the thickness of the thin area of the steel plate, and the downward movement speed of the roll into the formula: ; Calculating the total rolling time of the deformation zone ; wherein, is the half-thickness of the thick area of the steel plate, is the half-thickness of the thin area of the steel plate, is the downward movement speed of the roll; The roll gap determination unit can specifically be used for: Using the formula: ; Calculating the half-thickness of the outlet of the deformation zone at any time , is the half-thickness of the thick area of the steel plate, is the downward movement speed of the roll, is any time within 0- rolling time; Using the formula: ; Calculating half of the roll gap ; wherein, is the flattening radius of the roll.

[0058] Optionally, the distance calculation module where the outlet position of the deformation zone deviates from the roll center line can specifically be used for: According to the flattening radius of the roll, the half-thickness of the outlet of the deformation zone at any time, and the roll gap, using the formula: ; Calculating the distance where the outlet position of the deformation zone deviates from the roll center line ; wherein, is the flattening radius of the roll, is half of the roll gap, is the half-thickness at the exit of the deformation zone at any moment; The distance calculation module for the position of the entrance of the deformation zone deviating from the center line of the rolls can specifically be used for: According to the flattening radius of the rolls, the thickness of the thick plate area, and the roll gap between the two rolls, using the formula: ; Calculate the distance of the entrance position of the rolling deformation zone deviating from the center line of the rolls ; where, is the half-thickness of the steel plate.

[0059] Optionally, the rolling force calculation module 730 of the deformation zone can specifically be used for: Using the formula: ; Calculate the rolling force of the deformation zone ; where, ; ; Among them, is the total power functional, is the original radius of the roll, is the force arm coefficient, is the linear speed of the roll, is the flattening radius of the roll, is the half-thickness of the steel plate, is half of the roll gap between the two rolls, is the half-thickness at the exit of the deformation zone at any moment, is the downward movement speed of the roll, is the internal deformation power, is the shear power, is the friction power, is the neutral angle, and .

[0060] Based on the same idea, the embodiments of this specification also provide a roll gap setting device for the process of the thick plate rolling becoming thinner. As Figure 8 shown, it may include: A memory, a processor, and a communication interface coupled to the processor; a computer program that can be run by the processor is stored on the memory; when the processor runs the computer program, it executes the roll gap setting method for the process of the thick plate rolling becoming thinner described in the foregoing embodiments.

[0061] As Figure 8 shown, the above terminal device may further include a communication line. The communication line may include a passage for transmitting information between the above components.

[0062] Optionally, asFigure 8 As shown, the terminal device may further include a memory. The memory is used to store computer-executable instructions for implementing the solution of the present invention, and is controlled by the processor for execution. The processor is used to execute the computer-executable instructions stored in the memory, thereby implementing the method provided by the embodiments of the present invention.

[0063] In a specific implementation, as an embodiment, as Figure 8 shown, the processor may include one or more CPUs, such as Figure 8 CPU0 and CPU1 in

[0064] In a specific implementation, as an embodiment, as Figure 8 shown, the terminal device may include multiple processors, such as Figure 8 the processors in

[0065] Based on the same idea, the embodiments of this specification also provide a computer storage medium corresponding to the above embodiments. Instructions are stored in the computer storage medium, and when the instructions are run, the method in the above embodiments is implemented.

[0066] The above mainly introduces the solution provided by the embodiments of the present invention from the perspective of the interaction between various modules. It can be understood that, in order to implement the above functions, each module includes the corresponding hardware structure and software unit for executing each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed in this article, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0067] The embodiments of the present invention can perform functional module division according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present invention is illustrative, only a logical function division, and there may be other division methods in actual implementation.

[0068] The processor in this specification may also have the function of a memory. The memory is used to store computer-executable instructions for implementing the solution of the present invention, and is controlled by the processor for execution. The processor is used to execute the computer-executable instructions stored in the memory, thereby implementing the method provided by the embodiments of the present invention.

[0069] Optionally, the computer-executable instructions in the embodiments of the present invention may also be referred to as application program code, and the embodiments of the present invention do not make specific limitations thereon.

[0070] Although the present invention has been described in connection with various embodiments herein, however, in practicing the claimed invention, those skilled in the art can understand and realize other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the singular "a" or "an" does not exclude a plurality. A single processor or other unit may implement several functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0071] Although the present invention has been described in connection with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present invention. Accordingly, the present specification and the drawings are merely exemplary illustrations of the invention defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A roll gap setting method for the process of reducing the thickness of thick plates during rolling, characterized in that The method includes: Determining the rolled piece parameters, rolling process parameters, and rolling mill parameters according to the process specification data of the thick plate during the thinning process; Calculating the rolling zone parameters and deformation zone parameters during the thinning process of the steel plate according to the rolling process parameters, the rolled piece parameters, and the rolling mill parameters; the rolling zone parameters at least include the rolling zone inclination angle, and the deformation zone parameters at least include the deformation resistance of the deformation zone during the thinning process and the total rolling time of the deformation zone; Calculating the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the rolled piece; the deformation characteristics of the rolled piece at least include the velocity boundary condition of the deformation zone and the volume invariance condition; Obtaining the set value of the roll gap during the thinning process according to the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force of the deformation zone at any moment.

2. The roll gap setting method for the process of thickness reduction in heavy plate rolling according to claim 1, characterized in that, The rolled piece parameters at least include the steel plate thickness and the steel plate width; the rolling process parameters at least include the initial temperature of the steel plate, the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, the inlet velocity of the steel plate, the length of the thinning rolling zone of the steel plate, and the friction coefficient between the roll and the steel plate during the rolling process; the rolling mill parameters at least include the rolling mill stiffness, the linear velocity of the roll, the downward movement velocity of the roll, the original radius of the roll, the elastic modulus of the roll, and the Poisson's ratio of the roll; Calculating the rolling zone parameters and deformation zone parameters during the thinning process of the steel plate according to the rolling process parameters, the rolled piece parameters, and the rolling mill parameters, specifically including: Calculating the inclination angle of the thinning rolling zone of the steel plate through the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the length of the thinning rolling zone of the steel plate; Determining the deformation resistance of the deformation zone during the thinning process according to the rolled piece parameters and the rolling process parameters; Calculating the total rolling time of the deformation zone according to the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the downward movement velocity of the roll; Determining the exit half-thickness of the deformation zone at any moment, and determining the roll distance between the two rolls based on the exit half-thickness of the deformation zone at any moment, the flattened radius of the roll, and the rolling zone inclination angle.

3. The roll gap setting method during the process of the thick plate rolling becoming thinner according to claim 2, characterized in that, Before calculating the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the rolled piece, it further includes: Calculating the distance by which the exit position of the deformation zone deviates from the roll center line according to the flattened radius of the roll, the exit half-thickness of the deformation zone at any moment, and the roll distance between the two rolls; Calculating the distance by which the entrance position of the rolling deformation zone deviates from the roll center line according to the flattened radius of the roll, the thickness of the thick zone of the steel plate, and the roll distance between the two rolls.

4. The roll gap setting method during the process of reducing the thickness of heavy plate rolling according to claim 2, characterized in that, Calculating the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the rolled piece, specifically including: Establishing a velocity field of the rolling deformation zone that satisfies the kinematic admissibility condition according to the velocity boundary condition and volume invariance condition of the deformation zone; Determining the unit second flow rate at the entrance of the deformation zone, the average value of the contact angle, and the yield shear stress; Calculating the power of each part and the total power functional at any moment according to the velocity field and the deformation resistance; Calculating the total power functional corresponding to different neutral angles at any moment to obtain the minimum value of the total power functional; Calculating the rolling force of the deformation zone at any moment according to the relationship between the total power functional and the rolling force; Taking the rolling force and related parameters of the deformation zone as input data, and performing iterative calculations through the convergence condition between the flattened radius of the roll and the rolling force of the deformation zone to obtain a rolling force model that changes with time.

5. The roll gap setting method during the process of the thick plate rolling becoming thinner according to claim 3, characterized in that, Calculate the inclination angle of the thinning rolling zone of the steel plate based on the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the length of the thinning rolling zone of the steel plate. Specifically, it includes: Substitute the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the length of the thinning rolling zone of the steel plate into the formula: ； Calculating the Angle of the Thinning Rolling Zone of the Steel Plate ; where is the half thickness of the thick zone of the steel plate, is the half thickness of the thin zone of the steel plate, is the length of the thinning rolling zone of the steel plate; Determine the deformation resistance of the deformation zone during the thinning process based on the workpiece parameters and the rolling process parameters. Specifically, it includes: Substitute the workpiece parameters and the rolling process parameters into the formula: ； Calculate the deformation resistance of the deformation zone during the process of thinning ; where is the deformation resistance of the metal at T = 1000 °C , when is the initial temperature of the steel plate , , , , , are preset material coefficients related to the deformation conditions is the average deformation speed is the half-thickness of the steel plate is the half-thickness of the outlet of the deformation zone at any time; Calculate the total rolling time of the deformation zone based on the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the downward movement speed of the rolling rolls. Specifically, it includes: Substitute the thickness of the thick zone of the steel plate, the thickness of the thin zone of the steel plate, and the downward movement speed of the rolling rolls into the formula: ； Calculating the total rolling time of the deformation zone ; among which, is the half-thickness of the thick zone of the steel plate, is the half-thickness of the thin zone of the steel plate, is the downward movement speed of the rolling mill roll; Determine the half-thickness at the exit of the deformation zone at any moment, and determine the roll gap between the two rolling rolls based on the half-thickness at the exit of the deformation zone at any moment, the flattened radius of the rolling roll, and the inclination angle of the rolling zone. Specifically, it includes: Use the formula: ； Calculate the half thickness at the exit of the deformation zone at any moment , is the half thickness of the thick zone of the steel plate, is the downward movement speed of the roll, is from 0 - any moment within the rolling time; Use the formula: ； Calculate half of the roll gap between two rolls ; where is the flattening radius of the roll 6. The roll gap setting method during the process of reducing the thickness of heavy plate rolling according to claim 3, characterized in that, Calculate the distance by which the exit position of the deformation zone deviates from the center line of the rolling rolls based on the flattened radius of the rolling roll, the half-thickness at the exit of the deformation zone at any moment, and the roll gap between the two rolling rolls. Specifically, it includes: Based on the flattened radius of the rolling roll, the half-thickness at the exit of the deformation zone at any moment, and the roll gap between the two rolling rolls, use the formula: ； Calculate the distance by which the exit position of the deformation zone deviates from the line connecting the centers of the rolls ; where is the flattening radius of the roll, is half of the roll gap between the two rolls, is the half-thickness at the exit of the deformation zone at any given time; Calculate the distance by which the entrance position of the rolling deformation zone deviates from the center line of the rolling rolls based on the flattened radius of the rolling roll, the thickness of the thick zone of the steel plate, and the roll gap between the two rolling rolls. Specifically, it includes: Based on the flattened radius of the rolling roll, the thickness of the thick zone of the steel plate, and the roll gap between the two rolling rolls, use the formula: ； Calculate the distance of the entrance position of the rolling deformation zone deviating from the center line of the rolls ; where is the half thickness of the steel plate 7. The roll gap setting method for the process of reducing the thickness of heavy plate rolling according to claim 1, characterized in that, Calculate the total power functional at any moment and the rolling force of the deformation zone based on the deformation characteristics of the workpiece. Specifically, it includes: Use the formula: ； Calculate the rolling force in the deformation zone ; where ； ； Among them, is the total power functional, is the original radius of the roll, is the force arm coefficient, is the linear speed of the roll, is the flattened radius of the roll, is the half-thickness of the steel plate, is half of the distance between the two rolls, is the half-thickness at the exit of the deformation zone at any moment, is the downward movement speed of the roll, is the internal deformation power, is the shear power, is the friction power, is the neutral angle, and .

8. A roll gap setting device during the process of a thick plate rolling thinner, characterized in that, The device includes: A basic parameter determination module for determining workpiece parameters, rolling process parameters, and rolling mill parameters according to the process specification data of the thick plate rolling thinning process; A rolling zone parameter and deformation zone parameter determination module for calculating the rolling zone parameters and deformation zone parameters during the thinning process of the steel plate according to the rolling process parameters, the workpiece parameters, and the rolling mill parameters; the rolling zone parameters at least include the inclination angle of the rolling zone, and the deformation zone parameters at least include the deformation resistance of the deformation zone during the thinning process and the total rolling time of the deformation zone; A rolling force calculation module for the deformation zone for calculating the total power functional at any moment and the rolling force of the deformation zone according to the deformation characteristics of the workpiece; the deformation characteristics of the workpiece at least include the velocity boundary condition of the deformation zone and the volume invariance condition; A set value determination module for the roll gap for obtaining the set value of the roll gap during the thinning process according to the rolling mill stiffness, the theoretical value of the roll gap, and the rolling force of the deformation zone at any moment.

9. A roll gap setting device for the process of a thick plate becoming thinner during rolling, characterized in that the device It includes: A memory, a processor, and a communication interface coupled to the processor; A computer program that can be run by the processor is stored on the memory; When the processor runs the computer program, it executes the roll gap setting method for the thick plate rolling thinning process according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that, Instructions are stored in the computer storage medium, and when the instructions are run, the roll gap setting method for the thick plate rolling thinning process according to any one of claims 1 to 7 is implemented.

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