CN114985474B - Process method for online roll changing of dynamic dislocation regulation of DS rolling mill unit - Google Patents
Process method for online roll changing of dynamic dislocation regulation of DS rolling mill unit Download PDFInfo
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- 230000008569 process Effects 0.000 title claims abstract description 49
- 230000008859 change Effects 0.000 claims abstract description 69
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- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
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- 238000005246 galvanizing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B27/106—Heating the rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
- B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a dynamic dislocation change rule on-line roll changing process method of a DS rolling mill set, which changes a traditional rolling mill into a DS rolling mill with working rolls capable of rotating along the axis circumference of a supporting roll and changes a traditional five-stand group for endless rolling into a six-stand group. The lifting and the pressing of the working roll caused by the dynamic dislocation deformation rule of each frame are controlled by the circumferential rotation of the working roll along the axis of the supporting roll. When a certain frame needs to be removed, firstly, the standby frame carries out roller ironing operation, so that the working roller of the standby frame reaches a preset temperature and preset surface quality; then pressing down the working rolls of the stand-by machine frame, and adjusting rolling parameters according to the dynamic dislocation regulation of the six working machine frames; and finally, lifting the working roll of the roll withdrawing rack, and eliminating the roll lifting variable thickness area and the press roll variable thickness area by the last-pass working rack. The method prevents obvious thickness fluctuation when the roll is changed, and ensures the thickness precision of the plate strip.
Description
Technical Field
The invention relates to the technical field of metallurgy continuous casting and rolling, in particular to a process method for online roll changing of dynamic dislocation transformation regulations of a DS rolling mill set.
Background
The hot-rolled thin strip steel can be used as a finished product or a cold-rolled raw material, the demand of the hot-rolled thin strip steel is increasing day by day all over the world, but the energy consumption of the traditional strip steel hot rolling process is huge, and the energy-saving and environment-friendly social construction is not facilitated. At present, the thin slab continuous casting and rolling process is developed at the hot spot of research at home and abroad, and thin plate and strip products are produced by hot instead of cold, so that the energy consumption is reduced. The technique (ESP) of Endless rolling of hot-rolled Strip is the leading-edge technique in the field of short-flow hot-rolled Strip steel at home and abroad at present, the Endless rolling technique of hot-rolled Strip has the following advantages that the Endless rolling technique of hot-rolled Strip can be used for tapping iron when the Strip is hot at high temperature, the high-temperature energy of continuous casting billets is fully utilized, and large reduction is generated by using lower rolling force, compared with the conventional hot continuous rolling mill, 2-3 heating furnaces can be reduced, rolling is carried out at high temperature, the rolling power can be greatly reduced, and the electric energy consumption is greatly reduced; ESP is rolled at high temperature, so that the uniformity of microstructure of the product is improved, and the index performance of the product is greatly improved; the whole production line is not more than 200 meters from continuous casting to a finished product coiler, is very compact and belongs to an ultra-short flow, and the investment of equipment and plants is reduced; the high-quality ultra-thin strip steel is produced, and part of the ultra-thin strip steel can replace cold rolling products and is directly subjected to acid pickling and galvanizing; in the aspect of environmental protection, because the length of the rolling line is much shorter, the generation amount of iron scales can be reduced, the pollution of descaling water is reduced, the emission of greenhouse gases is reduced, and the environment protection is facilitated.
However, because the ESP production line mainly comprises thin gauge plate and strip products, the roll wear of the finishing mill group during the rolling process is very serious, and the roll changing period is generally twice as long as that of the conventional rolling. Because ESP is continuous casting and rolling, the upstream continuous casting process is forced to stop during the roll changing of the downstream finishing mill group, and the production efficiency of the continuous casting and rolling of the sheet billet is seriously influenced. The invention discloses a method for realizing online roll changing of a finishing mill group in ESP endless rolling, which is a method for realizing complete non-stop by adding a standby frame on the basis of five frames, aims to solve the problem of frequent roll changing of ESP, and aims to realize the method by adding the standby frame on the basis of five frames, simultaneously putting the standby frame into use and withdrawing the roll changing frame for rolling, and eliminating rolled piece wedge areas generated by two rolling mills in a very short time.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a process method for online roll replacement of a dynamic dislocation transformation protocol of a DS rolling mill set, which can reduce the length of a thickening region, shorten the roll withdrawing and loading time, and ensure no shutdown and no influence on normal rolling production under the condition of timely satisfying the control accuracy and response speed of the hydraulic system and transmission system of the existing industrial rolling mill.
The technical scheme adopted by the invention is as follows:
the invention provides a technique method for online roll changing of dynamic dislocation regulation of a DS rolling mill unit, which comprises the following steps:
the method is used for a six-stand endless rolling DS rolling mill group, and is used by five stands during normal rolling production; when a certain frame needs to be removed, the standby frame F j Performing roller ironing operation with a rolling reduction of 0mm, wherein the upper and lower working rollers just contact with the upper and lower surfaces of the plate blank, and when the stand-by frame F j After the working rolls have reached a predetermined temperature and a predetermined surface quality, the stand-by frame F j The working roll is pressed down immediately, the six frames are subjected to dynamic dislocation regulation to adjust rolling parameters, and the roll changing frame F i The rolls are replaced, at the moment, five working frames carry out dynamic dislocation change rules to adjust rolling parameters, and the last working frame eliminates a roll lifting variable thickness area and a press roll variable thickness area and restores to a normal production state; the method specifically comprises the following steps:
s1, collecting and inputting the process, plate and strip and frame parameters before and after dynamic roll changing and regulation changing; by F n Representing the number of stands of a rolling mill in a rolling mill group, and the value of the lower foot mark n is the number of stands of the rolling mill and is 0<n<7 and are integers;
s2, using the frame F as a frame i When the roller needs to be removed, the adjusting stages of the frames are as follows:
s2.1) Standby Rack F j And (3) a roller ironing stage:
standby rack F j Firstly, ironing a roller with the rolling reduction of 0mm and the roller ironing time of T 1 The displacement of the working roll can be divided into horizontal displacement y = (R + R) sin theta along the rolling direction, the moving direction is consistent with the slab moving direction, vertical displacement x = (R + R) (1-cos theta) along the height direction of the frame, and roll offset is adoptedModel, roller autorotation speed model I and tension control model I adjusting standby rack F j The roll gap and the tension of the roller reach set values, and at the moment, the forward slip coefficient change amount, the backward slip coefficient and the backward slip coefficient change amount in the first roller rotation speed model are all 0;
wherein R is the radius of the supporting roller, R is the radius of the working roller, and theta is the dislocation angle between the working roller and the supporting roller on the same side;
s2.2) adjusting the transition rack set:
step s 2.2.1) is performed when 6> i > j and i > 1), step s 2.2.2) is performed when i =6, and step s 2.2.3) is performed when i < j):
s2.2.1) frame group F j ～F i-1 Adjusting the roll gap and the roll speed: frame assembly F j ～F i-1 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the next stand, and a second roll offset model and a second roll autorotation speed model are adopted to adjust the stand-by stand F j The roll gap and the tension of the roller are enabled to reach the set value; frame assembly F i+1 ～F 6 Adjusting the speed of the roller: the rotation speeds of the rollers are adjusted through the tension control model II and the roller rotation speed model II to ensure that F i+1 ～F 6 The post-tension of each rack is kept unchanged in the adjusting process, and meanwhile, a rolled piece generates a compression roller variable-thickness area;
s2.2.2) frame group F j ～F 5 Adjusting the roll gap and the roll speed: frame assembly F j ～F 5 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the next stand, and a second roll offset model and a second roll autorotation speed model are adopted to adjust the stand-by stand F j The roll gap and the tension of the rolling piece enable the roll gap and the tension to reach set values, and meanwhile, the rolled piece generates a compression roller variable thickness area;
s2.2.3) frame group F i ～F j Adjusting the roll gap and the roll speed: frame assembly F i ～F j The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the previous frame, and a first roll offset model and a first roll autorotation speed model are adopted to adjust the standby frame F j The roll gap and the tension of the roller are enabled to reach the set value; frame assembly F j ～F 6 Adjusting the speed of the roller: by controlling the tensionRegulating the rotation speed of each roller by the type III and roller rotation speed model I to ensure F j ～F 6 The front tension of each frame is kept unchanged, and meanwhile, the rolled piece generates a roll lifting variable thickness area;
wherein, the step S2.2.1) is a step of adjusting the rolling parameters of the six racks by reverse flow roll changing when the roll withdrawing rack is not the tail rack, the step S2.2.2) is a step of adjusting the rolling parameters of the six racks by reverse flow roll changing when the roll withdrawing rack is the tail rack, and the step S2.2.3) is a step of adjusting the rolling parameters of the six racks by forward flow roll changing; when the rack set F m ～F n When the middle two lower corner marks m = n, the rack group F m ～F n Shown as a frame F m Or F n The tail frame is a frame F 6 ；
S2.3) roll changing frame F i A roller lifting stage:
at this time, the frame F i Roll gap and tension of and the preceding frame F i-1 Same, frame F i Lifting the roll while the rolled stock is being brought into a region of variable thickness, frame F i Adopting a roller offset model and a roller rotation speed model I, wherein the forward slip coefficient, the forward slip coefficient variation, the backward slip coefficient and the backward slip coefficient variation in the roller rotation speed model I are all 0, and a frame F i After the roller lifting is finished, the last working stand eliminates the roller lifting variable thickness area and the pressing roller variable thickness area, and the roller changing stand F returns to the normal rolling production stage i Becoming a new standby rack;
wherein when i<6 hours, the last working rack is a rack F 6 (ii) a When i =6, the last working rack is rack F 5 。
Further, the roll shift model is as follows
Wherein ΔTheta is the displacement angle change between the working roll and the supporting roll on the same side, delta P n Is F n Roll force variation of stand, P n Is F n Roll force of the stand, K n Is F n Full length bearing stiffness of the frame, Δ B n Is the difference between the length of the working roll body and the width of the roll, R is the original radius of the backup roll before the backup roll is put into operation, R is the original radius of the working roll before the working roll is put into operation, f n Is F n Roll gap value increment at the midpoint of the roll body, C, D, produced by deformation of the frame roll system 1 、D 2 For constant coefficient of width of rolled piece, v b,n Is F n Rack product entry velocity, v p,n Is F n Speed of deviation of working rolls of the machine frame along the circumference of the supporting roll, S b,n Is F n Coefficient of backward slip, Δ S, of rolled stock in stands b,n Is F n And the backward slip coefficient change quantity theta of the rolled piece of the rack is the dislocation angle between the working roll and the supporting roll on the same side.
Further, the roller rotation speed model is as follows
Wherein v is f,n-1 Is F n-1 Exit velocity, v, of the rolled stock in the stand b,n Is F n The entry velocity of the rolled piece to the stand, L the distance between stands, E the modulus of elasticity of the rolled piece, Δ t the time step, σ f,beftar Is a frame F n-1 Target value of front tension, σ f,befnow Is a frame F n-1 Current value of front tension, Δ v r,n Is F n Change in the rotational speed of the working rolls of the machine frame, S f,n-1 Is F n-1 Forward slip coefficient of the rolled piece of the stand, S b,n Is F n Coefficient of backward slip, Δ S, of rolled stock in stands f,n-1 Is F n-1 Change of forward slip coefficient, Δ v, of a rolled stock in a stand r,n-1 Is F n-1 Operation of the machine frameAmount of change of roll rotation speed A 1,n Is F n Coefficient of constant flattening of roll system between frame rolled piece and working roll, A 2,n Is F n The roll system between the support roll and the working roll of the frame is flattened by constant coefficient.
Further, the second model of the roll rotation speed is as follows
Wherein v is f,n Is F n Exit velocity, v, of the rolled stock in the stand b,n+1 Is F n The entry velocity of the rolled piece to the stand, L the distance between stands, E the modulus of elasticity of the rolled piece, Δ t the time step, σ f,afttar Is a frame F n+1 Target value of back tension, σ f,aftnow As a frame F n+1 Current value of the back tension, Δ v r,n Is F n Change in the rotational speed of the working rolls of the machine frame, S f,n Is F n Forward slip coefficient of the rolled piece of the stand, S b,n+1 Is F n+1 Coefficient of backward slip, Δ S, of rolled stock in stands f,n Is F n Change of forward slip coefficient, Δ v, of a rolled stock in a stand r,n+1 Is F n+1 Machine frame working roll rotation speed variation A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece and work roll 2,n Is F n The roll system between the support roll and the working roll of the frame is flattened by constant coefficient.
Further, the tension control model is as follows
σ f,n-1 Is F n-1 Unit front tension of the frame, h n-1 Is F n-1 The thickness of the outlet of the frame,
at time τ F n The tension of the frame unit>
At time tau n The exit thickness of the rack.
Further, the second tension control model is as follows
σ b.n Is F n Unit back tension of the frame H n Is F n The thickness of the entrance to the frame,
at time τ F n Unit back tension of frame>
At time τ F n The entrance thickness of the housing.
Further, the tension control model is as follows
σ f,n Is F n Unit front tension of the frame, h n Is F n The thickness of the outlet of the frame,
at time τ F n The tension of the frame unit>
At time tau n The exit thickness of the rack.
Compared with the prior art, the invention has the following beneficial effects:
the invention changes the traditional rolling mill into a DS rolling mill, when the working roll deviates along the circumference of the moving direction of the rolled piece, the working roll and the contact area of the rolled piece move together for a certain distance, compared with the vertical roll lifting mode, the DS rolling mill can shorten the length of the variable thickness area of the roll lifting, thereby shortening the response time of a rack control system used for eliminating the variable thickness area of the roll lifting of the rolled piece, leading the online roll changing effect to be better, improving the continuity of the endless rolling of thin strips and improving the production efficiency.
The invention changes the traditional five-frame rolling mill group into a six-frame rolling mill group, five frames are put into use, one frame is in a standby roll changing state, the roll changing step is carried out in three steps, the first step is that the standby frame firstly scalds the roll, and the temperature and the surface quality of the working roll are ensured; secondly, pressing down the working rolls of the standby frames, and enabling the six frames to participate in a dynamic dislocation regulation strategy; and thirdly, lifting the working rolls of the roll withdrawing frame, and simultaneously carrying out five working frames participating in a dynamic dislocation change regulation strategy until the roll lifting variable thickness area and the press roll variable thickness caused in the roll changing process are eliminated. The roll changing step is applicable to all roll changing conditions of the frame in forward flow roll changing and reverse flow roll changing.
The invention adds the roller ironing step during roller changing, which can not only ensure the stability of the surface temperature field of the plate belt in the roller changing process, but also ensure the rolling stability and the surface quality of the outlet plate in the roller changing process.
Drawings
FIG. 1 is a schematic overall flow diagram of the present invention;
FIG. 2 is a schematic diagram of the working roll lifting stage of the DS rolling mill of the present invention;
FIG. 3 is a schematic view of the working roll pressing stage of the DS rolling mill of the present invention;
FIG. 4 is a schematic view of a dynamic dislocation schedule for roller change in a downstream direction when the frame F1 is removed;
FIG. 5 is a schematic view of a reverse flow roll change dynamic dislocation schedule when the roll is removed from the frame F2;
fig. 6 is a schematic view of the dynamic dislocation regulation of the reverse roller change when the roller of the frame F6 is removed.
Wherein, the reference numbers: 1-supporting rollers; 2-a working roll; 3-side pushing roller; 4-lifting the roller to form a variable thickness area; 5-a variable thickness area of the compression roller; and 6-rolling the workpiece.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Example 1
With a frame F 1 As roll-changing stands, with stands F 4 As a standby rack, the technical method for carrying out the dynamic dislocation change regulation on-line roll changing of the DS rolling mill set is explained, and the regulation table is shown in a table 1. The offset angle theta in table 1 refers to the offset angle between the support roller 1 and the working roller 2 on the same side, and since the offset angle between the support roller 1 on the upper side and the working roller 2 of the rolled piece 6 is the same as the offset angle between the support roller 1 on the lower side and the working roller 2, only one offset angle value is listed in the rack parameters of a specification.
As shown in table 1, with stand-by frame F 4 Replacement roll stand F 1 For example, the rolling schedule is changed from schedule one to schedule two. At the frame F 4 Replacement frame F 1 The dynamic dislocation regulation is realized in the process of (2).
The technical method for online roll change of the dynamic dislocation regulation of the DS rolling mill set provided by the embodiment has the general flow schematic diagram as shown in FIG. 1, the roll lifting process of the DS rolling mill as shown in FIG. 2, the roll pressing process of the DS rolling mill as shown in FIG. 3, and the stand F 1 The schedule change before and after roller withdrawing is shown in fig. 4, and specifically comprises the following steps:
TABLE 1 protocol table
S1, 1Rack frame F 1 When the roller needs to be removed, the standby rack is F 4 Collecting and inputting the parameters of the process, the plate belt and the frame required by the time-varying regulation of the dynamic roll change, wherein F n Representing the number of stands of the stand set, the lower subscript n is the current number of stands of the mill, and 0<n<7 and is an integer;
s2, using the frame F as a frame 1 When the roller needs to be removed, the adjusting stages of the frames are as follows:
s2.1) Standby Rack F 4 And (3) a roller ironing stage:
standby rack F 4 Firstly, ironing a roller with the rolling reduction of 0mm and the roller ironing time of T 1 The offset movement of the working roll 2 is controlled by a track hydraulic cylinder and a rotating rod together, the displacement of the working roll 2 can be divided into horizontal displacement y = (R + R) sin theta along the rolling direction, the movement direction is consistent with the slab movement direction, vertical displacement x = (R + R) (1-cos theta) along the height direction of the stand, and the stand F is adjusted by adopting a roll offset model, a roll autorotation speed model I and a tension control model I j The roll gap and the tension of the roller reach set values, and at the moment, the forward slip coefficient change amount, the backward slip coefficient and the backward slip coefficient change amount in a first roller rotation speed model are all 0;
s2.2) transition rack set adjusting stage:
step s2.2.3 is performed when i =1 and j = 4):
s2.2.3) frame group F 1 ～F 4 Adjusting the roll gap and the roll speed: frame set F 1 ～F 4 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the previous frame, and a first roll offset model and a first roll autorotation speed model are adopted to adjust the standby frame F 4 The roll gap and the tension of the roller are enabled to reach set values; frame assembly F 4 ～F 6 Adjusting the speed of the roller: regulating the rotating speed of each roller through a tension control model III and a roller rotation speed model I to ensure that F 4 ～F 6 The front tension of each frame is kept unchanged, and meanwhile, a rolled piece 6 generates a roller lifting variable thickness area 4;
s2.3) Rack F 1 A roller lifting stage:
at this time, the frame F 1 Roll gap and tension of and a subsequent frame F 2 Same, machineFrame F 1 The roll lifting process, in which the rolled stock 6 is subjected to a roll lifting variable thickness zone 4, is shown in FIG. 3, and the stand F 1 The lifting roller adopts a roller offset model and a roller rotation speed model I, at the moment, the forward slip coefficient change quantity, the backward slip coefficient and the backward slip coefficient change quantity in the roller rotation speed model I are all 0, and the rack F 1 After the roller lifting is finished, removing the frame F 1 The five stands carry out dynamic dislocation regulation to adjust rolling parameters, and the last working stand F 6 Eliminating the roll lifting variable thickness area 4 and the press roll variable thickness area 5, and restoring the normal rolling production stage to the roll changing frame F 1 Becoming a new standby rack.
The roll offset model is as follows
Wherein delta theta is the change quantity of the deviation angle of the working roll 2 along the circumference of the supporting roll 1, delta P n Is F n Roll force variation of stand, P n Is F n Roll force of the stand, K n Is F n Full length bearing stiffness of the frame, Δ B n Is the difference between the length of the working roll 2 and the width of the roll, R is the original radius of the supporting roll 1 before the working, R is the original radius of the working roll 2 before the working, f n Is F n Roll gap value increment at the midpoint of the roll body, C, D, produced by deformation of the frame roll system 1 、D 2 Constant coefficient, v, of width dependence of the rolled stock 6 b,n Is F n Entry velocity, v, of the rolled stock 6 in the stand p,n Is F n The frame working roll 2 shifts speed along the circumference of the supporting roll 1, S b,n Is F n Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand b,n Is F n The back slip coefficient variation of the frame rolled piece 6 is theta which is an acute angle between a connecting line of central points of the working roll 2 and the supporting roll 1 and the vertical direction.
The model of the autorotation speed of the roller is as follows
Wherein v is f,n-1 Is F n-1 Exit velocity, v, of the rolled stock 6 from the stand b,n Is F n The entry speed of the frame rolled piece 6, L the distance between frames, E the modulus of elasticity of the rolled piece 6, Δ t the time step, σ f,beftar Is a frame F n-1 Target value of front tension, σ f,befnow Is a frame F n-1 Current value of front tension, Δ v r,n Is F n Change of rotation speed of the frame work roll 2, S f,n-1 Is F n-1 Forward slip coefficient, S, of the frame rolled stock 6 b,n Is F n Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand f,n-1 Is F n-1 Front slip coefficient change, Δ v, of the rolled stock 6 of the stand r,n-1 Is F n-1 Amount of change in rotational speed of the frame work roll 2, A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece 6 and work roll 2 2,n Is F n The roll system between the frame supporting roll 1 and the working roll 2 is flattened by constant coefficient.
The tension control model is as follows
σ f,n-1 Is F n-1 Unit front tension of the frame, h n-1 Is F n-1 The thickness of the outlet of the frame,
at time τ F n The tension of the frame unit>
At time τ F n Outlet thickness of the frame.
The tension control model is as follows
σ f,n Is F n Unit front tension of the frame, h n Is F n The thickness of the outlet of the frame,
at time τ F n The tension of the frame unit>
At time τ F n The exit thickness of the rack.
The dislocation angle theta between the working roll 2 and the supporting roll 1 on the same side is an acute angle between the connecting line of the central points of the working roll 2 and the supporting roll 1 on the same side and the vertical direction, the upper working roll 2 and the upper supporting roll 1 in the rolling mill are on the same side and are both on the upper side of the rolled piece 6, the lower working roll 2 and the lower supporting roll 1 in the rolling mill are on the same side and are both on the lower side of the rolled piece 6, and the dislocation angle between the supporting roll 1 on the upper side of the rolled piece 6 and the working roll 2 in the dynamic dislocation transformation procedure is the same as the dislocation angle between the supporting roll 1 on the lower side and the working roll 2 in numerical value.
The DS rolling mill is a frame for dynamically adjusting an offset Angle and a shearing Force (DS), and the DS rolling mill pushes the working roll 2 by using the side push roll 3 to enable the working roll 2 to rotate around the central line of the supporting roll 1, so that the offset Angle between the working roll 2 and the supporting roll 1 on the same side is dynamically adjusted to realize the lifting and the descending of the working roll 2 in the rolling process.
The dynamic dislocation regulation is to dynamically adjust the dislocation angle between the working roll 2 and the supporting roll 1 on the same side, the roll rotating speed, the front and rear tension of the stand and the stand simultaneously in the rolling process.
The roll lifting process of the DS rolling mill is shown in fig. 2, the area of the roll lifting variable thickness area 4 is continuously increased in the lifting process of the working roll 2, when the roll lifting is completed, the area of the roll lifting variable thickness area 4 reaches the maximum value, and the horizontal moving direction of the lifting of the working roll 2 is opposite to the moving direction of the rolled piece 6.
The compression roller process of the DS rolling mill is shown in fig. 3, the area of the compression roller variable thickness area 5 is continuously increased in the compression process of the working roller 2, when the compression roller is completed, the area of the compression roller variable thickness area 5 reaches the maximum value, and the horizontal movement direction of the compression of the working roller 2 is the same as the movement direction of the rolled piece 6.
Example 2
With a frame F 2 As roll-changing stands, with stands F 1 As a stand-by frame, the process method of the DS rolling mill group dynamic dislocation transformation regulation online roll change is explained, and the regulation table is shown in Table 2. The offset angle theta in table 2 refers to the offset angle between the supporting roll 1 and the working roll 2 on the same side, and since the offset angle between the supporting roll 1 on the upper side and the working roll 2 on the rolled piece 6 is the same as the offset angle between the supporting roll 1 on the lower side and the working roll 2, only one offset angle value is listed in the rack parameters of a procedure.
As shown in table 2, with stand-by frame F 1 Replacement roll stand F 2 For example, the rolling schedule is changed from schedule three to schedule four. At the frame F 1 Replacement frame F 2 The dynamic dislocation regulation is realized in the process of (2).
TABLE 2 protocol table
The technical method for online roll change of the dynamic dislocation regulation of the DS rolling mill set provided by the embodiment has the general flow schematic diagram as shown in FIG. 1, the roll lifting process of the DS rolling mill as shown in FIG. 2, the roll pressing process of the DS rolling mill as shown in FIG. 3, and the roll changing process of the DS rolling mill set as shown in F 2 The protocol change before and after roller withdrawing is shown in fig. 5, and the method specifically comprises the following steps:
s1, a frame F 2 When the roller needs to be removed, the standby rack is F 1 Collecting and inputting the parameters of the process, the plate belt and the frame required by the time-varying regulation of the dynamic roll change, wherein F n Representing the number of stands of the stand set, the lower subscript n is the current number of stands of the mill, and 0<n<7 and is an integer;
s2, using the frame F as a frame 2 When the roller needs to be removed, the adjusting stages of the frames are as follows:
s2.1) Standby Rack F 1 A roller ironing stage:
standby rack F 1 Firstly, ironing a roller with the rolling reduction of 0mm and the roller ironing time of T 1 The offset movement of the working roll 2 is controlled by a track hydraulic cylinder and a rotating rod together, the displacement of the working roll 2 can be divided into horizontal displacement y = (R + R) sin theta along the rolling direction, the movement direction is consistent with the movement direction of a plate blank, vertical displacement x = (R + R) (1-cos theta) along the height direction of a rack, and a standby rack F is adjusted by adopting a roll offset model, a roll autorotation speed model I and a tension control model I j The roll gap and the tension of the roller reach set values, and at the moment, the forward slip coefficient change amount, the backward slip coefficient and the backward slip coefficient change amount in the first roller rotation speed model are all 0;
s2.2) adjusting the transition rack set:
when 6 = i =2 = j =1 and i >1, then step s 2.2.1) is performed:
s2.2.1) Rack F 1 Adjusting the roll gap and the roll speed: frame F 1 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the next stand, and a roll deviation model and a roll autorotation speed model are adopted to adjust the stand-by stand F 1 The roll gap and the tension of the roller are enabled to reach the set value; frame assembly F 3 ～F 6 Adjusting the speed of the roller: regulating the rotation speed of each roller through the tension control model II and the roller rotation speed model II to ensure that F 3 ～F 6 The post-tension of each frame is kept unchanged in the adjusting process, and meanwhile, a rolled piece 6 generates a compression roller variable thickness area 5;
s2.3) Rack F 2 A roller lifting stage:
at this time, the frame F 2 Roll gap and tension of and a subsequent frame F 3 Same, frame F 2 The roll lifting process, in which the rolled stock 6 is subjected to a roll lifting variable thickness zone 4, is shown in FIG. 3, and the stand F 2 The lifting roller adopts a roller offset model and a roller rotation speed model I, and the forward slip coefficient in the roller rotation speed model I are changedThe variable, the backward slip coefficient and the backward slip coefficient change are all 0, and the frame F 2 After the roller lifting is finished, the last working frame F 6 Eliminating the roll lifting variable thickness area 4 and the press roll variable thickness area 5, and restoring the normal rolling production stage to the roll changing frame F 2 Becoming a new standby rack.
The roll offset model is as follows
Wherein delta theta is the change quantity of the deviation angle of the working roll 2 along the circumference of the supporting roll 1, delta P n Is F n Roll force variation of stand, P n Is F n Roll force of the stand, K n Is F n Full length bearing stiffness of the frame, Δ B n Is the difference between the length of the working roll 2 and the width of the roll, R is the original radius of the supporting roll 1 before the working, R is the original radius of the working roll 2 before the working, f n Is F n Roll gap value increment at the roll body midpoint caused by deformation of the frame roll system, C, D 1 、D 2 Constant coefficient, v, of width dependence of the rolled stock 6 b,n Is F n Entry velocity, v, of the rolled stock 6 in the stand p,n Is F n The frame working roll 2 shifts speed along the circumference of the supporting roll 1, S b,n Is F n Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand b,n Is F n The back slip coefficient variation of the frame rolled piece 6 is theta which is an acute angle between a connecting line of central points of the working roll 2 and the supporting roll 1 and the vertical direction.
The roll rotation speed model is as follows
Wherein v is f,n-1 Is F n-1 Exit velocity, v, of the rolled stock 6 from the stand b,n Is F n The entry speed of the rolled stock 6 on the stands, L the distance between the stands, E the modulus of elasticity of the rolled stock 6, Δ t the time step, σ f,beftar Is a frame F n-1 Target value of front tension, σ f,befnow Is a frame F n-1 Current value of front tension, Δ v r,n Is F n Change of rotation speed of the frame work roll 2, S f,n-1 Is F n-1 Forward slip coefficient, S, of the frame rolled stock 6 b,n Is F n Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand f,n-1 Is F n-1 Front slip coefficient change, Δ v, of the rolled stock 6 of the stand r,n-1 Is F n-1 Amount of change in rotational speed of the frame work roll 2, A 1,n Is F n The coefficient of constant flattening of the roll system between the frame rolling stock 6 and the working rolls 2, A 2,n Is F n The roll system between the frame supporting roll 1 and the working roll 2 is flattened by constant coefficient.
The second model of the self-rotation speed of the roller is as follows
Wherein v is f,n Is F n Exit velocity, v, of the rolled stock 6 from the stand b,n+1 Is F n The entry speed of the rolled stock 6 on the stands, L the distance between the stands, E the modulus of elasticity of the rolled stock 6, Δ t the time step, σ f,afttar As a frame F n+1 Target value of back tension, σ f,aftnow Is a frame F n+1 Current value of the back tension, Δ v r,n Is F n Amount of change in rotational speed of the frame work roll 2, S f,n Is F n Forward slip coefficient, S, of the frame rolled stock 6 b,n+1 Is F n+1 Coefficient of backward slip, Δ S, of the frame rolled stock 6 f,n Is F n Rack rolled piece6 forward slip coefficient change amount, Δ v r,n+1 Is F n+1 Amount of change in rotational speed of the frame work roll 2, A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece 6 and work roll 2 2,n Is F n The roll system between the frame supporting roll 1 and the working roll 2 is flattened by constant coefficient.
The tension control model is as follows
σ f,n-1 Is F n-1 Unit front tension of the frame, h n-1 Is F n-1 The thickness of the outlet of the frame,
at time tau n The tension of the frame unit>
At time τ F n The exit thickness of the rack.
The second tension control model is as follows
σ b.n Is F n Unit back tension of the frame H n Is F n The thickness of the entrance to the frame,
at time τ F n Unit back tension of frame>
At time tau n The entrance thickness of the housing.
The dislocation angle theta between the working roll 2 and the supporting roll 1 on the same side is an acute angle between the connecting line of the central points of the working roll 2 and the supporting roll 1 on the same side and the vertical direction, the upper working roll 2 and the upper supporting roll 1 in the rolling mill are on the same side and are both on the upper side of the rolled piece 6, the lower working roll 2 and the lower supporting roll 1 in the rolling mill are on the same side and are both on the lower side of the rolled piece 6, and the dislocation angle between the supporting roll 1 on the upper side of the rolled piece 6 and the working roll 2 in the dynamic dislocation transformation procedure is the same as the dislocation angle between the supporting roll 1 on the lower side and the working roll 2 in numerical value.
The DS rolling mill is a frame for dynamically adjusting an offset Angle and a shearing Force (DS), and the DS rolling mill pushes the working roll 2 by using the side push roll 3 to enable the working roll 2 to rotate around the central line of the supporting roll 1, so that the offset Angle between the working roll 2 and the supporting roll 1 on the same side is dynamically adjusted to realize the lifting and the descending of the working roll 2 in the rolling process.
The dynamic dislocation regulation is to dynamically adjust the dislocation angle between the working roll 2 and the supporting roll 1 on the same side, the roll rotating speed, the front and rear tension of the stand and the stand simultaneously in the rolling process.
The roll lifting process of the DS rolling mill is shown in fig. 2, the area of the roll lifting variable thickness area 4 is continuously increased in the lifting process of the working roll 2, when the roll lifting is completed, the area of the roll lifting variable thickness area 4 reaches the maximum value, and the horizontal moving direction of the lifting of the working roll 2 is opposite to the moving direction of the rolled piece 6.
The compression roller process of the DS rolling mill is shown in fig. 3, the area of the compression roller variable thickness area 5 is continuously increased in the compression process of the working roller 2, when the compression roller is completed, the area of the compression roller variable thickness area 5 reaches the maximum value, and the horizontal movement direction of the compression of the working roller 2 is the same as the movement direction of the rolled piece 6.
Example 3
With a frame F 6 As roll-changing stands, with stands F 4 As a stand-by frame, the process method of the DS rolling mill group dynamic dislocation transformation regulation online roll change is explained, and the regulation table is shown in Table 3. The offset angle theta in table 3 refers to the offset angle between the support roll 1 and the work roll 2 on the same side, and since the offset angle between the support roll 1 on the upper side and the work roll 2 on the rolled piece 6 is the same as the offset angle between the support roll 1 on the lower side and the work roll 2, only one offset angle value is listed in the rack parameters of a procedure.
As shown in table 3, with stand-by rack F 4 Replacement roll stand F 6 For example, the rolling schedule is switched from schedule five to schedule six. At the frame F 4 Replacement frame F 6 The dynamic dislocation regulation is realized in the process of (2).
The technical method for online roll change of the dynamic dislocation regulation of the DS rolling mill set provided by the embodiment has the general flow schematic diagram as shown in FIG. 1, the roll lifting process of the DS rolling mill as shown in FIG. 2, the roll pressing process of the DS rolling mill as shown in FIG. 3, and the roll changing process of the DS rolling mill set as shown in F 6 The schedule change before and after roller withdrawing is shown in fig. 6, and specifically comprises the following steps:
s1, a frame F 6 When the roller needs to be removed, the standby rack is F 4 Collecting and inputting the parameters of the process, the plate belt and the frame required by the time-varying regulation of the dynamic roll change, wherein F n Representing the number of stands of the stand set, the lower subscript n is the current number of stands of the mill, and 0<n<7 and is an integer;
TABLE 3 protocol table
S2, using the frame F as a frame 6 When the roller needs to be removed, the adjusting stages of the frames are as follows:
s2.1) Standby Rack F 4 And (3) a roller ironing stage:
standby rack F 4 Firstly, ironing a roller with the rolling reduction of 0mm and the roller ironing time of T 1 The offset movement of the working roll 2 is controlled by a track hydraulic cylinder and a rotating rod together, the displacement of the working roll 2 can be divided into horizontal displacement y = (R + R) sin theta along the rolling direction, the movement direction is consistent with the slab movement direction, vertical displacement x = (R + R) (1-cos theta) along the height direction of the stand, and the stand F is adjusted by adopting a roll offset model, a roll autorotation speed model I and a tension control model I j The roll gap and the tension of the roller reach set values, and at the moment, the forward slip coefficient change quantity, the backward slip coefficient and the like in a first roller rotation speed model,The back slip coefficient change amounts are all 0;
s2.2) adjusting the transition rack set:
step s2.2.2 is performed when i = 6):
s2.2.2) frame group F 4 ～F 5 Adjusting the roll gap and the roll speed: frame assembly F 4 ～F 5 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the next stand, and a second roll offset model and a second roll autorotation speed model are adopted to adjust the stand-by stand F 4 The roll gap and the tension of the rolling piece 6 are enabled to reach set values, and meanwhile, the rolling piece 6 generates a pressing roll variable thickness area 5;
s2.3) Rack F 6 A roller lifting stage:
at this time, the frame F 6 Roll gap and tension of and the preceding frame F 5 Same, frame F 6 The roll lifting process, in which the rolled stock 6 is subjected to a roll lifting variable thickness zone 4, is shown in FIG. 3, and the stand F 6 The lifting roller adopts a roller offset model and a roller rotation speed model I, at the moment, the forward slip coefficient change quantity, the backward slip coefficient and the backward slip coefficient change quantity in the roller rotation speed model I are all 0, and the rack F 6 After the roller lifting is finished, the last working frame F 5 Eliminating the roll lifting variable thickness area 4 and the press roll variable thickness area 5, and returning to the normal rolling production stage, the roll changing frame F 6 Becoming a new standby rack.
The roll offset model is as follows
Wherein delta theta is the change quantity of the deviation angle of the working roll 2 along the circumference of the supporting roll 1, delta P n Is F n Roll force variation of stand, P n Is F n Roll force of the stand, K n Is F n Full length bearing stiffness of the frame, Δ B n As the difference between the length of the roll body of the work roll 2 and the width of the rollR is the original radius of the support roller 1 before being put into operation, R is the original radius of the working roller 2 before being put into operation, f n Is F n Roll gap value increment at the roll body midpoint caused by deformation of the frame roll system, C, D 1 、D 2 Constant coefficient, v, of width dependence of the rolled stock 6 b,n Is F n Entry velocity, v, of the rolled stock 6 in the stand p,n Is F n The frame working roll 2 shifts speed along the circumference of the supporting roll 1, S b,n Is F n Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand b,n Is F n The back slip coefficient variation of the frame rolled piece 6 is theta which is an acute angle between a connecting line of central points of the working roll 2 and the supporting roll 1 and the vertical direction.
The model of the autorotation speed of the roller is as follows
Wherein v is f,n-1 Is F n-1 Exit velocity, v, of the rolled stock 6 of the stand b,n Is F n The entry speed of the rolled stock 6 on the stands, L the distance between the stands, E the modulus of elasticity of the rolled stock 6, Δ t the time step, σ f,beftar Is a frame F n-1 Target value of front tension, σ f,befnow Is a frame F n-1 Current value of front tension, Δ v r,n Is F n Change of rotation speed of the frame work roll 2, S f,n-1 Is F n-1 Forward slip coefficient, S, of the frame rolled stock 6 b,n Is F n Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand f,n-1 Is F n-1 Forward slip coefficient variation, Δ v, of the frame rolling stock 6 r,n-1 Is F n-1 Amount of change in rotational speed of the frame work roll 2, A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece 6 and work roll 2 2,n Is F n The roll system between the frame supporting roll 1 and the working roll 2 is flattened by constant coefficient.
The second roller rotation speed model is as follows
Wherein v is f,n Is F n Exit velocity, v, of the rolled stock 6 from the stand b,n+1 Is F n The entry speed of the rolled stock 6 on the stands, L the distance between the stands, E the modulus of elasticity of the rolled stock 6, Δ t the time step, σ f,afttar As a frame F n+1 Target value of back tension, σ f,aftnow Is a frame F n+1 Current value of the back tension, Δ v r,n Is F n Amount of change in rotational speed of the frame work roll 2, S f,n Is F n Forward slip coefficient, S, of the frame rolling stock 6 b,n+1 Is F n+1 Coefficient of backward slip, Δ S, of the rolled stock 6 of the stand f,n Is F n Forward slip coefficient variation, Δ v, of the frame rolling stock 6 r,n+1 Is F n+1 Amount of change in rotational speed of the frame work roll 2, A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece 6 and work roll 2 2,n Is F n The roll system between the frame supporting roll 1 and the working roll 2 is flattened by constant coefficient.
The tension control model is as follows
σ f,n-1 Is F n-1 Unit front tension of the frame, h n-1 Is F n-1 The thickness of the outlet of the frame,
at time τ F n The tension of the frame unit>
At time τ F n Out of the machine frameThe mouth thickness.
The dislocation angle theta between the working roll 2 and the supporting roll 1 on the same side is an acute angle between the connecting line of the central points of the working roll 2 and the supporting roll 1 on the same side and the vertical direction, the upper working roll 2 and the upper supporting roll 1 in the rolling mill are on the same side and are both on the upper side of the rolled piece 6, the lower working roll 2 and the lower supporting roll 1 in the rolling mill are on the same side and are both on the lower side of the rolled piece 6, and the dislocation angle between the supporting roll 1 on the upper side of the rolled piece 6 and the working roll 2 in the dynamic dislocation transformation procedure is the same as the dislocation angle between the supporting roll 1 on the lower side and the working roll 2 in numerical value.
The DS rolling mill is a frame for dynamically adjusting an offset Angle and a Shear Force (DS), and the DS rolling mill pushes the working roll 2 by using the side pushing roll 3 to rotate the working roll 2 around a central line of the supporting roll 1, so that the offset Angle between the working roll 2 and the supporting roll 1 on the same side is dynamically adjusted to realize the lifting and the lowering of the working roll 2 in the rolling process.
The dynamic dislocation regulation is to dynamically adjust the dislocation angle between the working roll 2 and the supporting roll 1 on the same side, the roll rotating speed, the front and rear tension of the stand and the stand simultaneously in the rolling process.
The roll lifting process of the DS rolling mill is shown in fig. 2, the area of the roll lifting variable thickness area 4 is continuously increased in the lifting process of the working roll 2, when the roll lifting is completed, the area of the roll lifting variable thickness area 4 reaches the maximum value, and the horizontal moving direction of the lifting of the working roll 2 is opposite to the moving direction of the rolled piece 6.
The compression roller process of the DS rolling mill is shown in fig. 3, the area of the compression roller variable thickness area 5 is continuously increased in the compression process of the working roller 2, when the compression roller is completed, the area of the compression roller variable thickness area 5 reaches the maximum value, and the horizontal movement direction of the compression of the working roller 2 is the same as the movement direction of the rolled piece 6.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. A DS rolling mill set dynamic dislocation regulation on-line roll changing process method is characterized in that: the method is used for a six-stand endless rolling DS rolling mill group, and is used by five stands during normal rolling production; when a certain frame needs to be removed, the standby frame F j Performing roller ironing operation with a rolling reduction of 0mm, wherein the upper and lower working rollers just contact with the upper and lower surfaces of the plate blank, and when the stand-by frame F j After the working rolls have reached a predetermined temperature and a predetermined surface quality, the stand-by frame F j The working roll is pressed down immediately, the six frames are subjected to dynamic dislocation regulation to adjust rolling parameters, and the roll changing frame F i The roller is replaced, at the moment, the five working frames carry out dynamic dislocation changing procedures to adjust rolling parameters, the last working frame eliminates a roller lifting variable thickness area and a roller pressing variable thickness area, and the rolling machine is recovered to a normal production state; the method specifically comprises the following steps:
s1, collecting and inputting the process, plate and strip and frame parameters before and after dynamic roll changing and regulation changing; by F n Representing the number of stands of a rolling mill in a rolling mill group, and the value of the lower foot mark n is the number of stands of the rolling mill and is 0<n<7 and are integers;
s2, using the frame F as a frame i When the roller needs to be removed, the adjusting stages of the frames are as follows:
s2.1) Standby Rack F j And (3) a roller ironing stage:
stand F j Firstly, ironing a roller with the rolling reduction of 0mm and the roller ironing time of T 1 The displacement of the working roll can be divided into horizontal displacement y = (R + R) sin theta along the rolling direction, the movement direction is consistent with the slab movement direction, vertical displacement x = (R + R) (1-cos theta) along the height direction of the stand, and the stand-by stand F is adjusted by adopting a roll offset model, a roll autorotation speed model I and a tension control model I j The roll gap and the tension of the roller reach set values, and at the moment, the forward slip coefficient change amount, the backward slip coefficient and the backward slip coefficient change amount in the first roller rotation speed model are all 0;
wherein R is the radius of the supporting roller, R is the radius of the working roller, and theta is the dislocation angle between the working roller and the supporting roller on the same side;
s2.2) adjusting the transition rack set:
step s 2.2.1) is performed when 6> i > j and i > 1), step s 2.2.2) is performed when i =6, and step s 2.2.3) is performed when i < j):
s2.2.1) frame group F j ～F i-1 Adjusting the roll gap and the roll speed: frame assembly F j ～F i-1 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the next stand, and a second roll offset model and a second roll autorotation speed model are adopted to adjust the stand-by stand F j The roll gap and the tension of the roller are enabled to reach the set value; frame assembly F i+1 ～F 6 Adjusting the speed of the roller: regulating the rotation speed of each roller through the tension control model II and the roller rotation speed model II to ensure that F i+1 ～F 6 The post-tension of each rack is kept unchanged in the adjusting process, and meanwhile, a rolled piece generates a compression roller variable-thickness area;
s2.2.2) frame group F j ～F 5 Adjusting the roll gap and the roll speed: frame assembly F j ～F 5 The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the next stand, and a second roll offset model and a second roll autorotation speed model are adopted to adjust the stand-by stand F j The roll gap and the tension of the rolling piece reach set values, and meanwhile, the rolling piece generates a compression roller variable thickness area;
s2.2.3) frame group F i ～F j Adjusting the roll gap and the roll speed: frame assembly F i ～F j The roll gap and the roll speed are respectively changed into the roll gap and the roll speed of the previous frame, and a first roll offset model and a first roll autorotation speed model are adopted to adjust the standby frame F j The roll gap and the tension of the roller are enabled to reach the set value; frame assembly F j ～F 6 Adjusting the speed of the roller: regulating the rotating speed of each roller through a tension control model III and a roller rotation speed model I to ensure that F j ～F 6 The front tension of each frame is kept unchanged, and meanwhile, a rolled piece generates a roll lifting variable thickness area;
wherein, the step S2.2.1) is a step of adjusting the rolling parameters of the six racks by changing rollers in a countercurrent way when the roller withdrawing rack is not the tail rack, the step S2.2.2) is a step of adjusting the rolling parameters of the six racks by changing rollers in a countercurrent way when the roller withdrawing rack is the tail rack, and the step S2.2.3) is a step of communicatingThe step of adjusting the rolling parameters of the six frames by downstream roll changing; when the rack set F m ～F n When the middle two lower corner marks m = n, the rack group F m ～F n Shown as a frame F m Or F n The tail frame is a frame F 6 ；
S2.3) roll changing frame F i A roller lifting stage:
at this time, the frame F i Roll gap and tension of and the preceding frame F i-1 Same, frame F i Lifting the roll while the rolled stock is being brought into a region of variable thickness, frame F i Adopting a roller offset model and a roller rotation speed model I, wherein the forward slip coefficient, the forward slip coefficient variation, the backward slip coefficient and the backward slip coefficient variation in the roller rotation speed model I are all 0, and a frame F i After the roll lifting is finished, the last working stand eliminates the roll lifting variable thickness area and the press roll variable thickness area, and the roll changing stand F returns to the normal rolling production stage i Becoming a new standby rack;
wherein when i<6 hours, the last working rack is a rack F 6 (ii) a When i =6, the last working rack is rack F 5 。
2. The process method for the online roll change of the dynamic dislocation regulation of the DS rolling mill set according to claim 1, is characterized in that: the roll offset model is as follows
Wherein Delta theta is the displacement angle change between the working roll and the supporting roll on the same side, delta P n Is F n Roll force variation of stand, P n Is F n Roll force of the stand, K n Is F n Full length bearing stiffness of the frame, Δ B n Is the difference between the length of the working roll body and the width of the roll, R isThe original radius of the support roll before the work, r is the original radius of the work roll before the work, f n Is F n Roll gap value increment at the roll body midpoint caused by deformation of the frame roll system, C, D 1 、D 2 For constant coefficient of width of rolled piece, v b,n Is F n Rack product entry velocity, v p,n Is F n Speed of deviation of working rolls of the machine frame along the circumference of the supporting roll, S b,n Is F n Coefficient of backward slip, Δ S, of rolled stock in stands b,n Is F n And the backward slip coefficient change quantity theta of the rolled piece of the rack is the dislocation angle between the working roll and the supporting roll on the same side.
3. The process method for the online roll change of the dynamic dislocation regulation of the DS rolling mill set according to claim 1, is characterized in that: the roll rotation speed model is as follows
Wherein v is f,n-1 Is F n-1 Exit velocity, v, of the rolled stock in the stand b,n Is F n The entry velocity of the rolled piece to the stand, L the distance between stands, E the modulus of elasticity of the rolled piece, Δ t the time step, σ f,beftar Is a frame F n-1 Target value of front tension, σ f,befnow As a frame F n-1 Current value of front tension, Δ v r,n Is F n Change in the rotational speed of the working rolls of the machine frame, S f,n-1 Is F n-1 Forward slip coefficient of the rolled piece of the stand, S b,n Is F n Coefficient of backward slip, Δ S, of rolled stock in stands f,n-1 Is F n-1 Forward slip coefficient variation, Δ v, of a frame workpiece r,n-1 Is F n-1 Amount of change in the rotational speed of the frame work roll, A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece and work roll 2,n Is F n Rack supportThe roll system between the supporting roll and the working roll is flattened by constant coefficient.
4. The process method for the online roll change of the dynamic dislocation regulation of the DS rolling mill set according to claim 1, is characterized in that: the second model of the self-rotation speed of the roller is as follows
Wherein v is f,n Is F n Exit velocity, v, of the rolled stock from the stand b,n+1 Is F n The entry velocity of the rolled piece to the stand, L the distance between stands, E the modulus of elasticity of the rolled piece, Δ t the time step, σ f,afttar As a frame F n+1 Target value of back tension, σ f,aftnow Is a frame F n+1 Current value of the back tension, Δ v r,n Is F n Change in the rotational speed of the working rolls of the machine frame, S f,n Is F n Forward slip coefficient of the rolled stock of the stand, S b,n+1 Is F n+1 Coefficient of backward slip, Δ S, of rolled stock in stands f,n Is F n Change of forward slip coefficient, Δ v, of a rolled stock in a stand r,n+1 Is F n+1 Amount of change in the rotational speed of the frame work roll, A 1,n Is F n Roll system flattening constant coefficient, A, between frame rolled piece and work roll 2,n Is F n The roll system between the frame supporting roll and the working roll is flattened by constant coefficient.
5. The process method for the online roll change of the dynamic dislocation regulation of the DS rolling mill set according to claim 1, is characterized in that: the tension control model is as follows
σ f,n-1 Is F n-1 Unit front tension of the frame, h n-1 Is F n-1 The thickness of the outlet of the frame,
at time tau n Tension in front of frame unit>
At time τ F n The exit thickness of the rack.
6. The process method for the online roll change of the dynamic dislocation regulation of the DS rolling mill set according to claim 1, is characterized in that: the second tension control model is as follows
σ b.n Is F n Unit back tension of the frame H n Is F n The thickness of the entrance to the frame,
at time τ F n The unit back tension of the frame is increased,
at time tau n The entrance thickness of the housing.
7. The process method for the online roll change of the dynamic dislocation regulation of the DS rolling mill set according to claim 1, is characterized in that: the tension control model is as follows
σ f,n Is F n Unit front tension of the frame, h n Is F n The thickness of the outlet of the frame,
at time τ F n The tension of the frame unit>
At time tau n The exit thickness of the rack. />
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