CN104785536A - Method for restraining convexity fluctuation in watermark point of hot-rolled steep strip - Google Patents
Method for restraining convexity fluctuation in watermark point of hot-rolled steep strip Download PDFInfo
- Publication number
- CN104785536A CN104785536A CN201410027440.6A CN201410027440A CN104785536A CN 104785536 A CN104785536 A CN 104785536A CN 201410027440 A CN201410027440 A CN 201410027440A CN 104785536 A CN104785536 A CN 104785536A
- Authority
- CN
- China
- Prior art keywords
- force
- roll
- frame
- convexity
- length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
Abstract
The invention relates to a method for restraining convexity fluctuation in a watermark point of a hot-rolled steep strip. The method comprises the following steps: front six frames are hotly continuously rolled and finely rolled on a seventh frame; the watermark point is detected through detecting the rolling force change of the front six frames; the whole length trend change is eliminated in a slide filtering mode; the roller bending force is dynamically compensated; and the convexity fluctuation in the watermark point of the strip steel is adjusted in real time. The method can preferably restrain the convexity fluctuation caused by the watermark point to improve the whole length convexity control precision of the strip steel. The method solves the problems of convexity fluctuation and low convexity control precision incapable of being solved by traditional methods.
Description
Technical field
The present invention relates to hot-strip production technical field, be specifically related to a kind of method suppressing the convexity fluctuation of hot-strip watermark point place, be applicable to the high accuracy Crown control of hot-strip product.
Background technology
Plate shape weighs one of most important index of strip product quality, and weighing the common two indices of plate shape quality is strip crown and glacing flatness.Strip crown, also known as band steel lateral thickness difference, refers to Strip thickness difference in the width direction.Different hot-strip products, also different to the requirement of strip crown, the requirement of hot-tandem unit on the control of strip crown is under the condition not affecting strip profile and flatness, improves strip profile control accuracy as far as possible.
In hot continuous rolling production process, roll produces elastic deformation, forms loading roll gap, and the section configuration of band steel depends on the shape of loading roll gap.The factor affecting loading roll gap mainly contains rolling load, bending roller force, the original convexity of roll, thermal expansion of rollers and roll wear etc.; In addition, band steel edge is fallen and wedge shape also has a certain impact to strip profile.Wherein, rolling load is the principal element affecting strip profile, and rolls' deformation changes along with the change of rolling load, thus strip profile is changed.
For eliminating the impact of above various factors on strip profile, improve Crown control precision, successively develop various control equipment, mainly comprise: (1) hydraulic working roll bending device, by changing the pressure in bowed roller hydraulic cylinder in the operation of rolling, thus change the amount of deflection of roll; (2) six roller HC milling trains, set up the intermediate calender rolls that can laterally twitch, improve roller effect between four-high mill working roll and backing roll; (3) work roll shifting mill, it changes the contact condition of working roll and backing roll by work roll shifting; (4) large convexity backing roll method, is a certain size convexity of grinding on backing roll, by appropriate design, adapts to the belt steel rolling of different in width; (5) variable convex roll, is sleeved on mandrel, fills hydraulic oil in the hydraulic cavities between sleeve and mandrel, changes oil pressure thus changes roll crown curve; (6) pair roller cross rolling mill, by making upper working rolls and lower working rolls intersect in pairs with backing roll, changes roll gap shape; (7) the work roll shifting formula milling train of special roll forming, by working roll is ground to special roll forming, thus when work roll shifting, its convexity can change to maximum by minimum of a value by continuous print.
Control method mainly comprises: (1) setup control, the initial set value of each frame work roll shifting position, work roll bending power and middle roll shift position etc. is provided by setup algorithm, tentatively to make strip profile and glacing flatness reach desired value, and ensure that the outlet convexity of each intermediate stand is positioned within the allowed band of this rack outlet plate shape; (2) Dynamic controlling, is utilize the detection signal being arranged on finish rolling end frame profile gauge below, carries out FEEDBACK CONTROL to convexity; (3) Self Adaptive Control carries out adaptively correcting to set-up function, thus eliminate the error of convexity desired value.
The use of above control appliance and control method, ensure that Crown control precision, but owing to there is the impact of above-mentioned various factors in the operation of rolling, these methods are difficult to improve convexity precision further.For this reason, patent 200710194281.9 discloses a kind of feedforward and feeds back the control mode combined, and the profile gauge namely by being arranged on finish rolling outlet carries out FEEDBACK CONTROL, carries out feedforward control by being arranged on the profile gauge before finishing stand, both work in coordination, and improve Crown control precision.But this mode needs to increase measurement device, raises the cost, and when adopting feedforward control, because band steel actual speed is difficult to accurately obtain, so just have impact on feedforward tracking accuracy, sometimes can bring bad impact on the contrary.
Patent KR20030049230 discloses a kind of multiple spot feedback controling mode, by measuring tape steel contour shape, consider band gad shape, the various situation of edge degradation, strip profile is controlled, avoid some maloperations during conventional Crown control, improve Crown control precision and rolling stability.But this mode is only also the control based on feedback, be difficult to control the convexity fluctuation of the various upper frequencies occurred in the operation of rolling.
Patent KR20010083654 discloses a kind of seven segmentation kinks and measures the method for strip profiles, and it, by being arranged on pressure-measuring head detection zone steel on kink at the tension force of diverse location, being converted into the shape on strip section, being finally used for controlling strip profile.This mode meets the promptness of control, but a lot of because have due in operation of rolling influence zone steel stability, be difficult to ensure band steel long-time steady operation, pressure-measuring head on such kink to be just difficult to accurately measure on band steel cross section actual tension everywhere, greatly have impact on the possibility that this mode drops into.
These methods improve Crown control precision mainly through FEEDBACK CONTROL above, but due to be positioned at for the measuring instrument of FEEDBACK CONTROL finish rolling outlet frame after, there is larger time stickiness, can only be used for control tendency change convexity; And the feedforward control being used for controlling upper frequency fluctuation exists the problem of tracking accuracy difference, there is the problem of Measurement sensibility in seven segmentation kinks, all not can solve the problem of convexity fluctuation.
Summary of the invention
The object of this invention is to provide a kind of method suppressing the convexity fluctuation of hot-strip watermark point place, the method utilizes a kind of method of Dynamic Rolling Process force compensating, suppress the convexity fluctuation because watermark point causes, thus improve the convexity precision of belt steel product, cannot solve in order to solve existing method the problem that convexity fluctuates, Crown control precision is low.
For achieving the above object, the solution of the present invention is: a kind of method suppressing the convexity fluctuation of hot-strip watermark point place, the method adopts 7 frame hot-rolling finishing mills, the control appliance adopted comprises process machine and profile gauge, described profile gauge is arranged on the exit position of finish rolling F7 frame, and for the convexity of calibration tape steel, described process machine is electrically connected with finish rolling F1 ~ F7 frame, for carrying out initial setting to finish rolling F1 ~ F7 frame, it is characterized in that the step of the method is as follows:
(1) process machine carries out initial setting to the roller of finish rolling 7 frame, roll shifting or cross roller;
Before (2) 7 frame hot continuous rolling finish rolling, F1 ~ F6 frame is being stung after steel starts respectively, according to the translational speed of its roll-force actual value and current band steel, adopt the moving average filter method based on the actual translational speed of band steel to carry out moving average filter process to roll-force, obtain the sliding average of its roll-force;
(3) actual value of front F1 ~ F6 frame each frame roll-force and described sliding average are compared, obtain the deviate of described each frame roll-force;
(4) according to the deviate of described each frame roll-force, obtain the situation of change of each frame roll-force of F1 ~ F6, and detect watermark point according to the situation of change of roll-force;
(5) F1 ~ F6 frame described in, respectively after stinging the steel delay adjustments time, according to the convexity fluctuation situation at watermark point place, obtains the bending roller force correction value of the F1 ~ F6 frame for suppressing convexity to fluctuate;
(6) amplitude limiting processing is carried out to described bending roller force correction value;
(7) first-order lag filtering process is carried out to the bending roller force correction value after amplitude limiting processing, eliminate the fluctuation of upper frequency;
(8) according to the bending roller force correction value after described F1 ~ F6 frame each frame filtering process, dynamic compensation is carried out to the bending roller force of described F1 ~ F6 frame, suppress the convexity fluctuation at watermark point place.
Further, the method for roll-force being carried out to moving average filter process is: the length of window first determining moving average filter, sting steel start after one-period, the value of current roll-force is designated as X
1, and calculate the length L of current period band steel movement
1, as total length of window L
sum, obtain the weights W of current roll-force
1,
now sliding average is X
1; In second round, current roll-force is designated as X
2, band steel movable length is L
2, with L
1add up and obtain new total length of window L
sum, calculate current roll-force weights W
2,
the sliding average calculated accordingly is now X
1+ X
2w
2, by that analogy, until after strip length fills up window, obtain the sliding average of first stage roll-force;
After strip length fills up window, if it is L that current period often inputs strip length
j, then window top will remove L
jlength, the rolling force value of its correspondence also will remove, and remains that the total length of in window each section is L
wi, calculate the weights W of each rolling force value accordingly
m, obtain the sliding average of second stage.
Further, the sliding average of described each frame roll-force is:
Wherein, X
aVfor the sliding average of roll-force; M represents that the m cycle after steel stung by band steel; W
mfor current roll-force weight,
l
mfor the length of m half period zones steel movement after steel stung by band steel; L
sumfor moving average filter length of window,
Work as L
sum>=L
witime, moving average filter length of window remains L
wi, now,
Wherein, L
wirepresent the length of window of rack outlet; I represents finish rolling i-th frame, i=1,2,3,4,5,6.
Further, after being with steel to sting steel, the length of m half period zones steel movement is:
L
m=v
i(t)·T
cyc
Wherein, L
mfor the length of m half period zones steel movement after steel stung by band steel;
V
it (), for band steel is in the translational speed through the i-th frame, is time dependent value in the operation of rolling, i=1,2,3,4,5,6;
T
cycfor the time of band steel movement;
Further, the length of window of described rack outlet is:
Wherein, L
wirepresent the length of window of rack outlet, i represents finish rolling i-th frame, i=1,2,3,4,5,6;
L
brepresent the interval between two watermark points;
H
irepresent rack outlet thickness, i represents finish rolling i-th frame, i=1,2,3,4,5,6.
Further, described bending roller force correction value is multiplied by a Crown control gain K by the roll-force of each frame
total_iobtain, this Crown control gain K
total_ibe made up of two parts, one for roll-force is to the conversion coefficient K of convexity
conv_i, one is adjustable gain K
tune_i, that is:
K
total_i=K
conv_i·K
tune_i
Wherein, K
tune_iregulate according to actual rolling situation, initial gain is 1;
α
b_ifor bending roller force lateral stiffness coefficient, α
p_ifor roll-force lateral stiffness coefficient.
Further, in described step (6), amplitude limiting processing is carried out to bending roller force correction value and refers to: when the bending roller force correction value obtained exceeds its limiting value, then the bending roller force correction value exported equals this limiting value; If do not exceed its limiting value, then export the bending roller force correction value obtained.
Further, the length of window of described moving average filter is set to be more than or equal to the gap length between two watermark points.
The beneficial effect that the present invention reaches: method of the present invention, it is the first six frame in seven frame hot continuous rolling finish rolling, by detecting the change of the first six frame roll-force, dynamic compensation is carried out to bending roller force, real-time adjustment strip profile fluctuation, the convexity fluctuation because watermark point causes can be suppressed preferably, improve the Crown control precision of band steel total length.And effectively can reduce the convexity fluctuation in hot-strip total length direction, improve the convexity precision of resulting belt product made from steel.Hot continuous rolling for configurations all both at home and abroad tradition walking beam reheating furnace produces line, and the method is all applicable, and popularizing application prospect is wide.
Accompanying drawing explanation
Fig. 1 is the hot continuous rolling finish rolling Crown control structure chart that the present invention adopts;
Fig. 2 is method flow diagram of the present invention;
Fig. 3 is watermark of the present invention some place convexity undulated control schematic diagram;
Fig. 4 is in embodiment one, conventional method convexity undulating value;
Fig. 5 is in embodiment one, adopts the convexity undulating value of the inventive method;
Fig. 6 is in embodiment two, conventional method convexity undulating value;
Fig. 7 is in embodiment two, adopts the convexity undulating value of the inventive method;
Fig. 8 is in embodiment three, conventional method convexity undulating value;
Fig. 9 is in embodiment three, adopts the convexity undulating value of the inventive method.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
As shown in Figure 1,1 ~ 7 is respectively finishing stand F1 ~ F7, and 8 is profile gauge, and 9 is process machine, and 10 ~ 15 are respectively kink.Wherein, process machine carries out initial setting according to the multiple situation such as roll forming, supplied materials to the roller of each frame of finish rolling, roll shifting or cross roller; Profile gauge is for measuring the strip profile of finish rolling outlet; ; Crown feedback controls convexity rack outlet band steel being detected according to the profile gauge after finishing stand, controls the bending roller force of front four the frame F1 ~ F4 of finish rolling.
The present invention detects watermark point according to the fluctuation change of the first six frame F1 of finish rolling ~ F6 roll-force, dynamically compensates bending roller force.But in the operation of rolling of one block of band steel, owing to being subject to the impact of the various factors such as air cooling, water-cooled, rolling rhythm, in a lot of situation, the overall variation scope of roll-force is larger, traditional roll-force is compensated and often reaches amplitude limit, largely reducing the control ability that it fluctuates to watermark point place convexity.This method adopts the method for roll-force moving average filter, eliminates the tendency change of roll-force, frame roll-force is compensated and is absorbed in the place's temperature fluctuation of elimination watermark point to the impact of convexity, better to control convexity fluctuation.The difference of the present invention and prior art is, controls strip profile fluctuation in real time, and coordinate crown feedback to control by the change detecting the first six frame roll-force, overall raising strip profile control accuracy.
As Fig. 2, method of the present invention comprises the steps:
(1) process machine carries out initial setting to the roller of finish rolling 7 frame, roll shifting or cross roller;
Before (2) 7 frame hot continuous rolling finish rolling, F1 ~ F6 frame is being stung after steel starts respectively, according to the translational speed of its roll-force actual value and current band steel, adopt the moving average filter method based on the actual translational speed of band steel to carry out moving average filter process to roll-force, obtain the sliding average of its roll-force;
(3) actual value of front F1 ~ F6 frame each frame roll-force and described sliding average are compared, obtain the deviate of described each frame roll-force;
(4) according to the deviate of described each frame roll-force, obtain the situation of change of each frame roll-force of F1 ~ F6, and detect watermark point according to the situation of change of roll-force;
(5) F1 ~ F6 frame described in, respectively after stinging the steel delay adjustments time, according to the convexity fluctuation situation at watermark point place, obtains the bending roller force correction value of the F1 ~ F6 frame for suppressing convexity to fluctuate;
(6) amplitude limiting processing is carried out to described bending roller force correction value;
(7) first-order lag filtering process is carried out to the bending roller force correction value after amplitude limiting processing, eliminate the fluctuation of upper frequency;
(8) according to the bending roller force correction value after described F1 ~ F6 frame each frame filtering process, dynamic compensation is carried out to the bending roller force of described F1 ~ F6 frame, suppress the convexity fluctuation at watermark point place.
The detailed process implementing the inventive method is as follows:
(1) calculating of roll-force sliding average
The watermark point occurred in hot continuous rolling finishing stands is because the step rate of heating furnace causes.Different heating furnace structures, can produce 7 ~ 9 watermark points do not waited on one block of band steel.In order to extract the roll-force change at these watermark point places, first it to be filtered out in general rolling force.Because the gap periods of each watermark point is at about 10s, according to the method for traditional first-order lag filtering, the making time of watermark point place Crown control function greatly will be postponed.Thus be employed herein a kind of method of the moving average filter based on band steel actual speed, its implementation is as follows:
First determine the length of window of moving average filter, its setting principle is to be more than or equal to the gap length between two watermark points.Generally, the watermark point interval of a rolling line is substantially constant, then its fundamental length can get a fixed value L
b, then according to each rack outlet thickness h
i, determine the length of window L of each rack outlet
wifor:
In formula, i represents the i-th frame, and span is 1 ~ 6.Each like this frame is converted on time constant filter basically identical, ensure that the uniformity of each mill stand control.
Sting after steel starts, read in current strip speed v
iwith roll-force actual value F
i, calculate the sliding average of roll-force, it specifically calculates point two stages: the first stage fills up window for stinging steel to strip length, and second stage is the calculating after window fills up.Below for F1 frame, circular is as follows:
Stage one:
Sting steel and start rear one-period, the value of current roll-force is designated as X
1, and calculate the length L of current period band steel movement
1, as total length of window L
sum, obtain the weights W of current roll-force
1,
now sliding average is X
1; In second round, current roll-force is designated as X
2, band steel movable length is L
2, with L
1add up and obtain new total length of window L
sum, calculate current roll-force weights W
2,
the sliding average calculated accordingly is now X
1+ X
2w
2, by that analogy, until after strip length fills up window, obtain the sliding average of first stage roll-force.Detailed process is as shown in table 1, and computational process is as follows:
L
m=v
1(t)·T
cyc
Wherein, X
aVfor the sliding average of roll-force; M represents that the m cycle after steel stung by band steel; W
mfor current roll-force weight,
l
mfor the length of m half period zones steel movement after steel stung by band steel; v
1t () is belt steel rolling speed, be time dependent value in the operation of rolling; T
cycfor the time of band steel movement; L
sumfor moving average filter window total length.
The table 1 sliding average stage one calculates
Stage two:
Work as L
sum>=L
w1time, length of window remains L
w1.If it is L that current period often inputs strip length
j, then window top will remove L
jlength, the rolling force value of its correspondence also will remove.Remain that the total length of in window each section is L like this
w1, calculate the weights W of each rolling force value accordingly
m.Detailed process is as shown in table 2, and computing formula is as follows:
The table 2 sliding average stage two calculates
(2) watermark point place convexity undulated control
Roll-force actual value compared with sliding average, obtain the deviate of roll-force, this value can to reflect in a period of time that roll-force fluctuates up and down situation near mean value.After stinging steel, frame is in unsteady state, and frame thickness regulates and also will postpone a period of time and could drop into, and for avoiding attonity or impacting THICKNESS CONTROL, Crown control will sting steel time delay a period of time T in this frame
delay_iafter come into operation, its control principle drawing is as shown in Figure 3.
Crown control gain K
total_ibe made up of two parts, one for roll-force is to the conversion coefficient K of convexity
conv_i, one is adjustable gain K
tune_i, specific formula for calculation is as follows:
K
total_i=K
conv_i·K
tune_i
Wherein, α
b_ifor bending roller force lateral stiffness coefficient; α
p_ifor roll-force lateral stiffness coefficient.These values are calculated by process machine model, K
tune_iregulate according to actual rolling situation, initial gain is 1.
The correction value of each frame bending roller force needs to carry out amplitude limit, and the size Lim_i of amplitude limit value needs to consider 3 points: the regulating power of (1) each frame roller equipment; (2) each frame bending roller force is to the regulating effect of convexity; (3) the adjustment sharing of load controlled with crown feedback.Correction value after amplitude limiting processing also needs to carry out filtering process, time constant filter T
ichoose the fluctuation situation will considering actual roll-force, eliminate the fluctuation of upper frequency.
In the actual operation of rolling, owing to needing the factor considering convexity and glacing flatness, operating personnel often will carry out intervention to bending roller force and regulate.This function, after delay a period of time is opened in manual intervention, proceeds to control, until this frame bending roller force is switched to balanced mode.
Introduce the embody rule example of the inventive method below:
Produce in the transformation of line three electricity at certain hot continuous rolling, implement the solution of the present invention.According to this product line actual watermark point situation, L
bvalue 0.25, the T of 6 frames
delay_ivalue 1000ms, the T of 6 frames
ivalue is 300ms, and the value of the amplitude limit value Lim_i of each frame bending roller force correction is as shown in table 3:
The bending roller force correction value amplitude limit of front 6 frames of table 3
| Frame | F1 | F2 | F3 | F4 | F5 | F6 |
| Lim(ton) | 50 | 50 | 50 | 25 | 15 | 15 |
Embodiment one:
When rolling steel grade, the roll-force of each frame to the conversion coefficient of convexity and adjustable gain value as shown in table 4:
The roll-force of front 6 frames of table 4 embodiment one is to the conversion coefficient of convexity and adjustable gain value
| Frame | F1 | F2 | F3 | F4 | F5 | F6 |
| K conv | 0.19 | 0.33 | 0.30 | 0.11 | 0.11 | 0.08 |
From Fig. 4 and Fig. 5: in the belt steel rolling of same batch, the fluctuation of conventional method convexity reaches about 20um, and the program is maximum only has about 7um.
Embodiment two:
When rolling steel grade, the roll-force of each frame to the conversion coefficient of convexity and adjustable gain value as shown in table 5:
The roll-force of front 6 frames of table 5 embodiment two is to the conversion coefficient of convexity and adjustable gain value
| Frame | F1 | F2 | F3 | F4 | F5 | F6 |
| K conv | 0.26 | 0.43 | 0.19 | 0.33 | 0.24 | 0.23 |
From Fig. 6 and Fig. 7: in the belt steel rolling of same batch, the fluctuation of conventional method convexity reaches about 15um, and the program is maximum only has about 8um.
Embodiment three
When rolling steel grade, the roll-force of each frame to the conversion coefficient of convexity and adjustable gain value as shown in table 6:
The roll-force of front 6 frames of table 6 embodiment three is to the conversion coefficient of convexity and adjustable gain value
| Frame | F1 | F2 | F3 | F4 | F5 | F6 |
| K conv | 0.18 | 0.43 | 0.19 | 0.14 | 0.15 | 0.09 |
From Fig. 8 and Fig. 9: in the belt steel rolling of same batch, the fluctuation of conventional method convexity reaches about 20um, and the program is maximum only has about 12um.
In sum, line is produced in the hot rolling for the traditional walking beam reheating furnace of configuration, enters the belt steel temperature of finishing stand, can be subject to the impact of heating furnace watermark point, and some special steel grades affect larger by this, can bring the fluctuation by a relatively large margin of steel total length convexity like this.Crown feedback controls to eliminate this fluctuation, and traditional roll-force compensate function can because the roll-force tendency change of band steel total length, and control effects weakens greatly.The difference of the present invention and conventional method is, controls strip profile fluctuation in real time, and coordinate crown feedback to control by the change detecting the first six frame roll-force, overall raising strip profile control accuracy.Method of the present invention effectively can reduce the convexity fluctuation in hot-strip total length direction, improves the convexity precision of resulting belt product made from steel.Hot continuous rolling for configurations all both at home and abroad tradition walking beam reheating furnace produces line, and the method is all applicable, and popularizing application prospect is wide.
Claims (8)
1. one kind is suppressed the method for hot-strip watermark point place convexity fluctuation, the method is applied to 7 frame hot-rolling finishing mills, the control appliance adopted comprises process machine and profile gauge, described profile gauge is arranged on the exit position of finish rolling F7 frame, for the convexity of calibration tape steel, described process machine is electrically connected with finish rolling F1 ~ F7 frame, for carrying out initial setting to finish rolling F1 ~ F7 frame, it is characterized in that the step of the method is as follows:
(1) process machine carries out initial setting to the roller of finish rolling 7 frame, roll shifting or cross roller;
Before (2) 7 frame hot continuous rolling finish rolling, F1 ~ F6 frame is being stung after steel starts respectively, according to the translational speed of its roll-force actual value and current band steel, adopt the moving average filter method based on the actual translational speed of band steel to carry out moving average filter process to roll-force, obtain the sliding average of its roll-force;
(3) actual value of front F1 ~ F6 frame each frame roll-force and described sliding average are compared, obtain the deviate of described each frame roll-force;
(4) according to the deviate of described each frame roll-force, obtain the situation of change of each frame roll-force of F1 ~ F6, and detect watermark point according to the situation of change of roll-force;
(5) F1 ~ F6 frame described in, respectively after stinging the steel delay adjustments time, according to the convexity fluctuation situation at watermark point place, obtains the bending roller force correction value of the F1 ~ F6 frame for suppressing convexity to fluctuate;
(6) amplitude limiting processing is carried out to described bending roller force correction value;
(7) first-order lag filtering process is carried out to the bending roller force correction value after amplitude limiting processing, eliminate the fluctuation of upper frequency;
(8) according to the bending roller force correction value after described F1 ~ F6 frame each frame filtering process, dynamic compensation is carried out to the bending roller force of described F1 ~ F6 frame, suppress the convexity fluctuation at watermark point place.
2. the method for suppression hot-strip watermark point place according to claim 1 convexity fluctuation, it is characterized in that the method for roll-force being carried out to moving average filter process is: the length of window first determining moving average filter, sting steel start after one-period, the value of current roll-force is designated as X
1, and calculate the length L of current period band steel movement
1, as total length of window L
sum, obtain the weights W of current roll-force
1,
now sliding average is X
1; In second round, current roll-force is designated as X
2, band steel movable length is L
2, with L
1add up and obtain new total length of window L
sum, calculate current roll-force weights W
2,
the sliding average calculated accordingly is now X
1+ X
2w
2, by that analogy, until after strip length fills up window, obtain the sliding average of first stage roll-force;
After strip length fills up window, if it is L that current period often inputs strip length
j, then window top will remove L
jlength, the rolling force value of its correspondence also will remove, and remains that the total length of in window each section is L
wi, calculate the weights W of each rolling force value accordingly
m, obtain the sliding average of second stage.
3. the method for suppression hot-strip watermark point place according to claim 2 convexity fluctuation, is characterized in that the sliding average of described each frame roll-force is:
Wherein, X
aVfor the sliding average of roll-force; M represents that the m cycle after steel stung by band steel; W
mfor current roll-force weight,
l
mfor the length of m half period zones steel movement after steel stung by band steel; L
sumfor moving average filter length of window,
Work as L
sum>=L
witime, moving average filter length of window remains L
wi, now,
Wherein, L
wirepresent the length of window of rack outlet; I represents finish rolling i-th frame, i=1,2,3,4,5,6.
4. the method for suppression hot-strip watermark point place according to claim 3 convexity fluctuation, after it is characterized in that being with steel to sting steel, the length of m half period zones steel movement is:
L
m=v
i(t)·T
cyc
Wherein, L
mfor the length of m half period zones steel movement after steel stung by band steel;
V
it (), for band steel is in the translational speed through the i-th frame, is time dependent value in the operation of rolling, i=1,2,3,4,5,6;
T
cycfor the time of band steel movement.
5. the method for suppression hot-strip watermark point place according to claim 3 convexity fluctuation, is characterized in that the length of window of described rack outlet is:
Wherein, L
wirepresent the length of window of rack outlet, i represents finish rolling i-th frame, i=1,2,3,4,5,6;
L
brepresent the interval between two watermark points;
H
irepresent rack outlet thickness, i represents finish rolling i-th frame, i=1,2,3,4,5,6.
6. the method for suppression hot-strip watermark point place according to claim 1 convexity fluctuation, is characterized in that described bending roller force correction value is multiplied by a Crown control gain K by the roll-force of frame
total_iobtain, this Crown control gain K
total_ibe made up of two parts, one for roll-force is to the conversion coefficient K of convexity
conv_i, one is adjustable gain K
tune_i, that is:
K
total_i=K
conv_i·K
tune_i
Wherein, K
tune_iregulate according to actual rolling situation, initial gain is 1;
α
b_ifor bending roller force lateral stiffness coefficient, α
p_ifor roll-force lateral stiffness coefficient.
7. the method for suppression hot-strip watermark point place according to claim 1 convexity fluctuation, it is characterized in that in described step (6), carry out amplitude limiting processing to bending roller force correction value to refer to: when the bending roller force correction value obtained exceeds its limiting value, then the bending roller force correction value exported equals this limiting value; If do not exceed its limiting value, then export the bending roller force correction value obtained.
8. the method for suppression hot-strip watermark point place according to claim 2 convexity fluctuation, is characterized in that the length of window of described moving average filter is set to be more than or equal to the gap length between two watermark points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410027440.6A CN104785536B (en) | 2014-01-21 | 2014-01-21 | A kind of method for suppressing convexity fluctuation at hot-strip watermark point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410027440.6A CN104785536B (en) | 2014-01-21 | 2014-01-21 | A kind of method for suppressing convexity fluctuation at hot-strip watermark point |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104785536A true CN104785536A (en) | 2015-07-22 |
| CN104785536B CN104785536B (en) | 2017-06-23 |
Family
ID=53550981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410027440.6A Active CN104785536B (en) | 2014-01-21 | 2014-01-21 | A kind of method for suppressing convexity fluctuation at hot-strip watermark point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104785536B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112845613A (en) * | 2020-12-23 | 2021-05-28 | 河钢股份有限公司承德分公司 | Thickness control method and device for hot-rolled strip steel and terminal equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10192929A (en) * | 1997-01-16 | 1998-07-28 | Toshiba Corp | Method and device for control of rolling mill |
| CN1911546A (en) * | 2005-08-09 | 2007-02-14 | 中冶赛迪工程技术股份有限公司 | Equipment and method for controlling hot rolled plate shape |
| CN101890433A (en) * | 2010-01-30 | 2010-11-24 | 太原科技大学 | On-line coordination control method for plate shape and plate thickness of strip tandem hot continuous rolling mill |
| CN101890435A (en) * | 2010-07-20 | 2010-11-24 | 江苏省沙钢钢铁研究院有限公司 | Method for automatically controlling convexity and/or wedge of hot rolled in series type rolling machine and system thereof |
| CN102632085A (en) * | 2012-04-23 | 2012-08-15 | 中冶南方工程技术有限公司 | Cold-rolled strip steel plate shape control system and method |
| CN102814341A (en) * | 2011-06-10 | 2012-12-12 | 上海优控科技有限公司 | Novel decoupling control method for plate strip thickness and plate type |
| CN103341503A (en) * | 2013-05-21 | 2013-10-09 | 首钢总公司 | Self-adaptation convexity change hot rolled plate shape control model |
| CN103433295A (en) * | 2013-08-05 | 2013-12-11 | 苏州有色金属研究院有限公司 | Method for controlling convexity of single-rack double-coiler aluminum hot mill |
-
2014
- 2014-01-21 CN CN201410027440.6A patent/CN104785536B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10192929A (en) * | 1997-01-16 | 1998-07-28 | Toshiba Corp | Method and device for control of rolling mill |
| CN1911546A (en) * | 2005-08-09 | 2007-02-14 | 中冶赛迪工程技术股份有限公司 | Equipment and method for controlling hot rolled plate shape |
| CN101890433A (en) * | 2010-01-30 | 2010-11-24 | 太原科技大学 | On-line coordination control method for plate shape and plate thickness of strip tandem hot continuous rolling mill |
| CN101890435A (en) * | 2010-07-20 | 2010-11-24 | 江苏省沙钢钢铁研究院有限公司 | Method for automatically controlling convexity and/or wedge of hot rolled in series type rolling machine and system thereof |
| CN102814341A (en) * | 2011-06-10 | 2012-12-12 | 上海优控科技有限公司 | Novel decoupling control method for plate strip thickness and plate type |
| CN102632085A (en) * | 2012-04-23 | 2012-08-15 | 中冶南方工程技术有限公司 | Cold-rolled strip steel plate shape control system and method |
| CN103341503A (en) * | 2013-05-21 | 2013-10-09 | 首钢总公司 | Self-adaptation convexity change hot rolled plate shape control model |
| CN103433295A (en) * | 2013-08-05 | 2013-12-11 | 苏州有色金属研究院有限公司 | Method for controlling convexity of single-rack double-coiler aluminum hot mill |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112845613A (en) * | 2020-12-23 | 2021-05-28 | 河钢股份有限公司承德分公司 | Thickness control method and device for hot-rolled strip steel and terminal equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104785536B (en) | 2017-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103934278B (en) | A kind of hot fine rolling band steel method for controlling thickness | |
| CN101683659B (en) | Integrated control method of cold-rolling strip steel flatness and lateral thickness difference | |
| CN102029294B (en) | Control method of lateral thick difference of cold-rolling strip steels | |
| CN101890435B (en) | Method for automatically controlling convexity and/or wedge of hot rolled in series type rolling machine and system thereof | |
| CN104511484B (en) | The micro-middle wave board-shape control method of a kind of hot-strip | |
| CN104942019B (en) | A kind of cold rolling of strip steel process Automatic control method of width | |
| CN100446883C (en) | Flattening process for steel strip | |
| CN108405630B (en) | A kind of control method and device of belt plate shape | |
| CN101934290B (en) | Load allocation adjusting method for stainless steel tandem cold rolling mill | |
| CN104096714B (en) | A kind of hot-strip convexity autocontrol method | |
| CN102688898B (en) | Control method for strip shape in rolling of cold-rolling strip steel by two-stand temper mill | |
| CN103962392B (en) | A kind of continuous hot-rolling mill mm finishing mill unit Dynamic load control method | |
| CN103433295A (en) | Method for controlling convexity of single-rack double-coiler aluminum hot mill | |
| CN106269903B (en) | A kind of continuous hot-rolling mill roller optimal setting method | |
| CN103464471A (en) | Automatic gauge control (AGC) self-adaptive control method for hot rolling mill | |
| CN102974622A (en) | Parameter compensation method and control method for short stroke control of head-tail width of strip steel | |
| CN104148404A (en) | Hot rolled strip flatness automatic control method | |
| CN103949481A (en) | Flatness subsection control method considering both rolling stability and quality of hot rolling band steel | |
| CN103071683A (en) | Comprehensive adjustment rolling technology for double-frame S-shaped four-roll cold rolling mill | |
| CN107442577A (en) | A kind of fine-rolling strip steel sharing of load establishing method | |
| CN201720260U (en) | Convexity and/or wedge automatic control system of hot rolling series-connection type rolling mill | |
| CN104923568A (en) | Control method for preventing strip breaking during thin steel strip cold rolling process | |
| CN101920265B (en) | Method for optimizing roll shifting process of middle roll of six-roll cold mill | |
| CN106269908B (en) | Strip wedge shape autocontrol method based on heredity | |
| CN106607460B (en) | Sendzimir 20 high mill Edge shape control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |