CN105921525B - The band afterbody method for correcting error of Continuous mill train - Google Patents
The band afterbody method for correcting error of Continuous mill train Download PDFInfo
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- CN105921525B CN105921525B CN201610291957.5A CN201610291957A CN105921525B CN 105921525 B CN105921525 B CN 105921525B CN 201610291957 A CN201610291957 A CN 201610291957A CN 105921525 B CN105921525 B CN 105921525B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
- B21B38/105—Calibrating or presetting roll-gap
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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
Abstract
The invention discloses a kind of band afterbody method for correcting error of Continuous mill train, it is related to metal-pressed machine technical field, this method comprises the following steps：The enabling signal of band afterbody correction program is set, starts band afterbody correction program when the metal detector for being arranged in Continuous mill train porch detects the afterbody of middle base rolled piece；Calculate and amendment Continuous mill train the second frame bilateral roll gap difference；Calculate and the remaining frame bilateral roll gap difference of amendment Continuous mill train；Self study is carried out to the correction factor of frame bilateral roll gap difference correction.The present invention solves the afterbody lateral bending correction in the existing middle base operation of rolling, there is delayed and unstable, the problem of causing rectifying effect difference.
Description
Technical field
The present invention relates to metal-pressed machine technical field, the band afterbody method for correcting error of especially a kind of Continuous mill train.
Background technology
In the production process of coils of hot rolled, plate ingot was rolled into certain thickness centre on a big mill before this
Base, then be sent to Continuous mill train and be disposably rolled into coiled material.During base in the middle of rolling, influenceed by various factors, it is middle
Different degrees of lateral bending occurs in base, that is, the camber being commonly called as.When carrying out tandem rolling, if do not carried out for the lateral bending of middle base
Control, then can cause the head of coiled material and afterbody staggered floor defect occur.Current production scene be typically operative employee under observation
Between base lateral bending situation after rectified a deviation by adjusting the bilateral roll gap difference of frame, but there is hysteresis quality and unstable in artificial operation
Property, rectifying effect is poor.
The content of the invention
It is an object of the invention to provide a kind of band afterbody method for correcting error of Continuous mill train, this method can solve existing
, there is delayed and unstable, the problem of causing rectifying effect difference in the afterbody lateral bending correction in the middle base operation of rolling.
In order to solve the above problems, the technical solution adopted by the present invention is：The band afterbody correction side of this Continuous mill train
Method comprises the following steps：
A, setting band afterbody correction program enabling signal, when the metal detector for being arranged in Continuous mill train porch is examined
Start band afterbody correction program when measuring the afterbody of middle base rolled piece；
B, calculating and amendment Continuous mill train the second frame bilateral roll gap difference：Collection is arranged in the first frame and the second frame
Between the first tonometry roller measured by the actual Value Data of the tension force of mill drive side and fore side and be arranged in the second machine
The actual Value Data of the tension force of mill drive side and fore side measured by the second tonometry roller between frame and the 3rd frame, is calculated
The correction of second frame bilateral roll gap difference, corrects the second frame bilateral roll gap；
C, calculating and the remaining frame bilateral roll gap difference of amendment Continuous mill train：When band from the second breast roll by amendment
Seam is dished out, and when marching to the pressure tap of tonometry roller, collection is arranged in the second tension force between the second frame and the 3rd frame
Measure the actual Value Data of the tension force of mill drive side and fore side measured by roller and be arranged in the 3rd frame and the 4th frame
Between the 3rd tonometry roller measured by the actual Value Data of the tension force of mill drive side and fore side, calculate the double of the 3rd frame
Side roller stitches the correction of difference, corrects the 3rd frame bilateral roll gap；By that analogy, calculate and correct the bilateral roller of remaining each frame
Seam；
D, the correction factor to frame bilateral roll gap difference correction carry out self study.
In the technical scheme of the band afterbody method for correcting error of above-mentioned Continuous mill train, more specifically technical scheme can also be：
The method of the enabling signal of base rolled piece afterbody correction program is as follows in the middle of step A settings：
The tail position of middle base rolled piece is detected by the metal detector for being arranged in Continuous mill train porch, metal
The installation site of detector is 20000≤D≤50000 with the span apart from D that Continuous mill train first roller is stitched, middle
The length of base is more than D, therefore in the early stage and mid-term of continuous rolling process, the signal of metal detector is always 1, shows to detect
Middle base rolled piece is by the test position of metal detector, when the afterbody of middle base rolled piece leaves the detection of metal detector
During position, the signal of metal detector is changed into 0 from 1, shows the afterbody of middle base rolled piece by the test point of metal detector, i.e.,
When metal detector detects trailing edge signal, the enabling signal of middle base rolled piece afterbody correction program is sent to PLC system,
Show to proceed by middle base rolled piece afterbody correction control.
Further, step B is calculated and the specific method of amendment Continuous mill train the second frame bilateral roll gap difference is as follows：It is false
If the total frame number of Continuous mill train is N；Second frame transmission side roll gap is S2d, unit is millimeter；Second gantry operation side roller is stitched
S2o, unit is millimeter；The roll gap difference Q of second frame2=S2d-S2o, unit is millimeter；
When PLC system receives the enabling signal of middle base rolled piece afterbody correction program, the first frame and the second frame
Between the average value of 10~30 transmission side tension force actual values that continuously measures of the first tonometry roller be T1d, unit is ton；The
The average value for 10~30 fore side tension force actual values that the first tonometry roller between one frame and the second frame is continuously measured
For T1o, unit is ton；After measurement terminates, the bilateral measured by the first tonometry roller between the first frame and the second frame is calculated
The difference R of the average value of tension force actual value1For：
R1=T1d-T1o
Unit is ton；
If calculating R1Absolute value be more than 1 ton hour, it was demonstrated that there is sideslip situation in the afterbody of middle base, then according to R1Numerical value
Roll gap difference to the second frame is modified；Assuming that the correction of the second frame roll gap difference is q2, unit is millimeter, it is assumed that
q2>=0, the correction factor of the second frame roll gap difference correction is k2, k2Initial value be 1, the second frame roll gap after being corrected
Difference Q '2=Q2+q2, unit is millimeter；
The roll gap difference correction of second frame is averaged with the bilateral tension force actual value measured by the first tonometry roller
The corresponding relation of the difference of value is as shown in the table：
Complete after above-mentioned calculating, control the second machine frame rolling mill transmission side and fore side hydraulic cylinder that roll gap is poor by PLC system
Value is corrected to Q '2。
Further, step C is calculated and the specific method of the remaining frame bilateral roll gap difference of amendment Continuous mill train is as follows：
After the amendment to the bilateral roll gap difference of the n-th frame is completed, it is assumed that 2≤n≤N-1, start to calculate poor through roll gap
The strip material portion rolled after value amendment is passed through when marching to the pressure tap of the n-th tonometry roller between the n-th frame and the (n+1)th frame
The time t gone throughn, unit is the second；
Assuming that the transmission side tension force actual value between the n-th frame and the (n+1)th frame measured by the n-th tonometry roller is Tnd, it is single
Position is ton；Fore side tension force actual value measured by n-th frame and the (n+1)th interstand tension measurement roller is Tno, unit is ton, its
Middle n≤N；Now, it is assumed that the (n+1)th frame transmission side roll gap is S(n+1)d, unit is millimeter；(n+1)th gantry operation side roller is stitched
S(n+1)O, unit is millimeter；The roll gap difference Q of (n+1)th framen+1=S(n+1)d-S(n+1)O, unit is millimeter；Assuming that the n-th frame
Mill speed be Vn, unit is mm/second；Advancing slip value is wn；N-th rack outlet window of web velocities is vn, unit is mm/second,
Then vnCalculating formula is：
vn=Vn(1+wn)
The distance of pressure tap at the roll gap of known n-th frame to the n-th tonometry roller is G, then tn=G/vn, therefore, when
After completing to the amendment of the bilateral roll gap difference of the n-th frame, by tnStart after second between the n-th frame of collection and the (n+1)th frame
Bilateral tension force actual value measured by tonometry roller；PLC system receive instrument detection data cycle be 100 milliseconds within,
Assuming that 20 transmission side tension force actual values that now the n-th tonometry roller is continuously measured between the n-th frame and the (n+1)th frame are averaged
It is worth for Tnd, unit is ton；20 fore side tension force that the n-th tonometry roller is continuously measured between n-th frame and the (n+1)th frame are actual
The average value of value is Tno, unit is ton, then the difference R of two average valuenFor：
Rn=Tnd-Tno
Unit is ton；
If difference RnAbsolute value be more than 1 ton hour, it was demonstrated that bilateral roll gap difference of the afterbody of middle base Jing Guo the n-th frame is repaiied
Sideslip situation is just still had afterwards, then according to difference RnNumerical value the roll gap difference of the (n+1)th frame is modified；Assuming that n-th+
The correction of 1 frame roll gap difference is qn+1, unit is millimeter, it is assumed that qn+1>=0, the (n+1)th frame roll gap difference correction is repaiied
Positive coefficient is kn+1；Roll gap difference Q ' after being correctedn+1=Qn+1+qn+1, unit is millimeter；
The difference of the roll gap difference correction of (n+1)th frame and the bilateral tension force actual value measured by the n-th tonometry roller
Corresponding relation it is as shown in the table：
Complete after above-mentioned calculating, control the (n+1)th machine frame rolling mill transmission side and fore side hydraulic cylinder that roll gap is poor by PLC system
Value is corrected to Q 'n+1。
Further, the method that step D carries out self study to the correction factor of frame bilateral roll gap difference correction is as follows：
After the afterbody correction of base in the middle of one piece is completed, R can obtain1, R2, R3…RN-1Ordered series of numbers, to the ordered series of numbers carry out
Search, when finding following two situations, need to learn by oneself to the correction factor of the bilateral roll gap difference correction of the (n+1)th frame
Practise：
(1) R is worked asn＜ -1 and Rn+1During ＞ 1；
Such a situation explanation, the transmission side warp tension ratio behaviour between the n-th frame and the (n+1)th frame measured by the n-th tonometry roller
Make side tension force small, and there is lateral bending in the band that difference is more than between 1 ton, i.e. the n-th frame and the (n+1)th frame, and lateral bending direction is behaviour
Make side, after correcting the bilateral roll gap difference of the (n+1)th frame, the (n+1)th tonometry roller between the (n+1)th frame and the n-th+2 frame
The band that measured transmission side warp tension ratio fore side tension force is more than between more than 1 ton, i.e. the (n+1)th frame and the n-th+2 frame is present
Lateral bending, and lateral bending direction is transmission side, this shows, when correcting the bilateral roll gap difference of the (n+1)th frame, there is accommodative excess
Phenomenon, makes the lateral bending direction of band be changed into transmission side, i.e. q from fore siden+1Absolute value it is excessive, can be by correction factor
kn+1Self study is carried out to reduce qn+1Value, and by the correction factor k ' after self studyn+1For the calculating of base in the middle of next piece,
k′n+1Calculating formula be：
(2) R is worked asn＞ 1 and Rn+1During ＜ -1；
Such a situation explanation, the transmission side warp tension ratio behaviour between the n-th frame and the (n+1)th frame measured by the n-th tonometry roller
Make side tension force and there is lateral bending more than the band between more than 1 ton, i.e. the n-th frame and the (n+1)th frame, and lateral bending direction is transmission side；
After correcting the bilateral roll gap difference of the (n+1)th frame, between the (n+1)th frame and the n-th+2 frame measured by the (n+1)th tonometry roller
Transmission side warp tension ratio fore side tension force it is small, and difference is more than band between 1 ton, i.e. the (n+1)th frame and the n-th+2 frame and there is side
It is curved, and lateral bending direction is fore side, this shows, when correcting the bilateral roll gap difference of the (n+1)th frame, there is showing for accommodative excess
As making the lateral bending direction of band be changed into fore side, i.e. q from transmission siden+1Absolute value it is excessive, can be by correction factor kn+1
Self study is carried out to reduce qn+1Value, and by the correction factor k ' after self studyn+1For the calculating of base in the middle of next piece, k 'n+1's
Calculating formula is identical with formula (1).
By adopting the above-described technical solution, the present invention has the advantages that compared with prior art：It can realize
The correction control of band afterbody in continuous rolling process, corrects the afterbody deflection of supplied materials rolled piece, in time, stably, rectifying effect is good for correction.
Brief description of the drawings
Fig. 1 is that the band of afterbody deflection measures the schematic diagram that roller measures tension force in the first and second interstand tensions.
Embodiment
The invention will be further described for embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, the metal detector 6 for measuring band afterbody is installed before the first frame 1 of Continuous mill train,
First tonometry roller 3 is installed between the first frame 1 and the second frame 2；First tonometry roller 3 has transmission side pressure tap
4 and fore side pressure tap 5；D is the horizontal range of the roll axis of the frame of metal detector 6 to the first 1, and unit is millimeter；G is
At each frame roll gap to tonometry roller thereafter pressure tap horizontal range, unit is millimeter.
The present invention is considered when middle base rolled piece is rolling to and soon finished up in Continuous mill train, by being arranged in Continuous mill train entrance
The metal detector at place is detected to the tail position of middle base rolled piece, when the afterbody for detecting middle base rolled piece passes through metal
During the test position of detector, the enabling signal of middle base rolled piece afterbody correction program is sent to PLC system, shows to proceed by
Middle base rolled piece afterbody correction control, now by rolling measured by the tonometry roller being arranged between the first frame and the second frame
The actual Value Data of tension force of machine transmission side and fore side and the tonometry roller being arranged between the second frame and the 3rd frame are surveyed
The actual Value Data of the tension force of mill drive side and fore side of amount is transferred to computer by data collecting system and handled, this
Two groups of numerical value are converted into the correction of the bilateral roll gap difference of the second frame.Thrown when band from the second frame roll gap by amendment
When going out, and marching to the pressure tap of tonometry roller, the tonometry roller being arranged between the second frame and the 3rd frame is surveyed
The actual Value Data of the tension force of mill drive side and fore side of amount and the tonometry being arranged between the 3rd frame and the 4th frame
The actual Value Data of the tension force of mill drive side and fore side measured by roller is transferred to computer progress by data collecting system
Reason, is converted into two groups of numerical value the correction of the bilateral roll gap difference of the 3rd frame.By that analogy, until obtaining last frame
The correction of bilateral roll gap difference, so as to reach the purpose rectified a deviation to band afterbody.Specifically the step of, is as follows：
Step A：Set the enabling signal of band afterbody correction program
When middle base is rolling to and soon finished up in Continuous mill train, by the metal detector for being arranged in Continuous mill train porch
The tail position of middle base rolled piece is detected, the installation site of metal detector and Continuous mill train first roller stitch away from
Base rolled piece afterbody glances off the equal length of part in the middle of when should be with actual roll from D, that is, needs the middle base rectified a deviation
Rolled piece tail length, this length is determined by the Side Bend Control level of the roughing mill of cogging, if the Side Bend Control water of roughing mill
Flat higher, then the length can be a smaller value, otherwise be a higher value, and the span of the value is 20000≤D≤50000.
The length of middle base is generally higher than D, therefore is always 1 in the early stage of continuous rolling process and the signal of mid-term metal detector, shows
Middle base rolled piece can be detected by the test position of metal detector, when the afterbody of middle base rolled piece leaves metal detection
During the test position of device, the signal of metal detector is changed into 0 from 1, shows that the afterbody of middle base rolled piece passes through metal detector
Test point, i.e., when metal detector detects trailing edge signal, middle base rolled piece afterbody correction program is sent to PLC system
Enabling signal, shows to proceed by middle base rolled piece afterbody correction control.
Step B：Calculate the correction of Continuous mill train the second frame bilateral roll gap difference
Assuming that the total frame number of Continuous mill train is N=4；Second frame transmission side roll gap is S2d=23.05 millimeters；Second frame
Fore side roll gap is S2o=23.24 millimeters；The roll gap difference Q of second frame2=S2d-S2o=23.05-23.24=-0.19 millis
Rice；
When PLC system receives the enabling signal of middle base rolled piece afterbody correction program, the first frame and the second frame
Between the average value of 20 transmission side tension force actual values that continuously measures of tonometry roller be T1d=16 tons；First frame and the second machine
The average value for 20 fore side tension force actual values that tonometry roller is continuously measured is T between frame1o=22 tons.After measurement terminates, meter
Calculate the first frame and the second interstand tension measurement roller measured by bilateral tension force actual value average value difference R1For：
R1=T1d-T1o=16-22=-6 tons
Calculated R1Absolute value be more than 1 ton, it was demonstrated that there is sideslip situation in the afterbody of middle base, then according to R1Numerical value pair
The roll gap difference of second frame is modified.It is noted that in applying in production, the biography that tonometry roller is continuously measured
The number scope of dynamic side or fore side tension force actual value can be 10~30.Assuming that the correction of the second frame roll gap difference is
q2, unit is millimeter, it is assumed that q2>=0, the correction factor of the second frame roll gap difference correction is k2, k2Initial value be 1.Through repairing
Roll gap difference Q ' after just2=Q2+q2, unit is millimeter；
The roll gap difference correction of second frame is averaged with the bilateral tension force actual value measured by the first tonometry roller
The corresponding relation of the difference of value is as shown in table 1：
Table 1
Due to R1=-6 tons, inquiry table 1 understands q2=0.2k2=0.2, therefore Q '2=Q2+q2=-0.19+0.2=0.01
Millimeter.Complete after above-mentioned calculating, control the second machine frame rolling mill transmission side and fore side hydraulic cylinder to repair roll gap difference by PLC system
Just to Q '2=0.01 millimeter.
Step C：Calculate the correction of the remaining frame bilateral roll gap difference of Continuous mill train
Now the correction respectively to the third and fourth frame bilateral roll gap difference is calculated：
(1) correction of the 3rd frame bilateral roll gap difference is calculated
After the amendment to the bilateral roll gap difference of the second frame is completed, start calculating and rolled after roll gap difference amendment
Strip material portion march to the second frame and the 3rd interstand tension and measure the time t undergone during the pressure tap of roller2, unit is
Second；
Now, it is assumed that the 3rd frame transmission side roll gap is S3d=15.52 millimeters；3rd gantry operation side roller seam is S3o=
15.71 millimeters；The roll gap difference Q of 3rd frame3=S3d-S3o=15.52-15.64=-0.12 millimeters.Assuming that the second frame
Mill speed is Vn=3000 mm/seconds；Advancing slip value is wn=0.043；Second rack outlet window of web velocities is vn, unit is milli
Meter per second, then vnCalculating formula is：
vn=Vn(1+wn)=3000 × the mm/second of (1+0.043)=3129
At the roll gap of known second frame to the second frame and the 3rd interstand tension measurement roller pressure tap apart from G=
1200 millimeters.Then tn=G/vn=1200/3129=0.384 seconds.Therefore, when completing to the bilateral roll gap difference of the second frame
After amendment, the bilateral tension force started afterwards measured by the second frame of collection and the 3rd interstand tension measurement roller by 0.384 second
Actual value.Assuming that 20 transmission side tension force actual values that now the second frame and the 3rd interstand tension measurement roller are continuously measured
Average value is T2d=21 tons；20 fore side tension force actual values that second frame and the 3rd interstand tension measurement roller are continuously measured
Average value be T2o=17 tons.The then difference R of two average value2For：
R2=T2d-T2o=21-17=4 tons
Due to R2Absolute value be more than 1 ton, it was demonstrated that bilateral roll gap difference amendment of the afterbody of middle base Jing Guo the second frame
Sideslip situation is still had afterwards, then according to difference R2Numerical value the roll gap difference of the 3rd frame is modified.Assuming that the 3rd machine
The correction of frame roll gap difference is q3, unit is millimeter, it is assumed that q3>=0, the correction factor of the 3rd frame roll gap difference correction is
k3, its initial value design is k3=1.Roll gap difference Q ' after being corrected3=Q3+q3, unit is millimeter；
The difference of the roll gap difference correction of (n+1)th frame and the bilateral tension force actual value measured by the n-th tonometry roller
Corresponding relation it is as shown in table 2：
Table 2
Due to R2=4 tons, therefore table look-up and 2 can obtain：
Then Q '3=-0.12+ (- 0.033)=- 0.153 millimeter.Complete after above-mentioned calculating, the 3rd machine is controlled by PLC system
Rolling mill transmission side and fore side hydraulic cylinder are by roll gap difference amendment to Q '3=-0.153 millimeter.
(2) correction of the 4th frame bilateral roll gap difference is calculated
After the amendment to the bilateral roll gap difference of the 3rd frame is completed, start calculating and rolled after roll gap difference amendment
Strip material portion march to the 3rd frame and the 4th interstand tension and measure the time t undergone during the pressure tap of roller3, unit is
Second.
Now, it is assumed that the 4th frame transmission side roll gap is S4d=12.32 millimeters；4th gantry operation side roller seam is S3o=
12.41 millimeters；The roll gap difference Q of 4th frame4=S4d-S4o=12.32-12.41=-0.09 millimeters.Assuming that the 3rd frame
Mill speed is V3=4000 mm/seconds；Advancing slip value is w3=0.057；3rd rack outlet window of web velocities is v3, unit is milli
Meter per second, then v3Calculating formula is：
v3=V3(1+w3)=4000 × the mm/second of (1+0.057)=4228
At the roll gap of known 3rd frame to the 3rd frame and the 4th interstand tension measurement roller pressure tap apart from G=
1200 millimeters.Then tn=G/vn=1200/4228=0.284 seconds.Therefore, when completing to the bilateral roll gap difference of the 3rd frame
After amendment, the bilateral tension force started afterwards measured by the 4th frame of collection and the 4th interstand tension measurement roller by 0.284 second
Actual value.Assuming that 20 transmission side tension force actual values that now the 3rd frame and the 4th interstand tension measurement roller are continuously measured
Average value is T3d=19 tons；20 fore side tension force actual values that 3rd frame and the 4th interstand tension measurement roller are continuously measured
Average value be T3o=21 tons.The then difference R of two average value3For：
R3=T3d-T3o=19-21=-2 tons
Due to R3Absolute value be more than 1 ton, it was demonstrated that bilateral roll gap difference amendment of the afterbody of middle base Jing Guo the 3rd frame
Sideslip situation is still had afterwards, then according to difference R3Numerical value the roll gap difference of the 4th frame is modified.Assuming that the 4th machine
The correction of frame roll gap difference is q4, unit is millimeter, it is assumed that q4>=0, the correction factor of the 3rd frame roll gap difference correction is
k4, its initial value design is k4=1.Roll gap difference Q ' after being corrected4=Q4+q4, unit is millimeter.
Due to R3=-2 tons, therefore table look-up and 2 can obtain：
Then Q '4=-0.09+0.025=-0.065 millimeters.Complete after above-mentioned calculating, control the 3rd frame to roll by PLC system
Machine transmission side and fore side hydraulic cylinder are by roll gap difference amendment to Q '4=-0.065 millimeter.
Step D：The self study of the correction factor of roll gap difference correction
After the afterbody correction of base in the middle of this block is completed, R can obtain1=-6, R2=4, R3=-2, are carried out to the ordered series of numbers
The search of following two situations：
(1) R is worked asn＜ -1 and Rn+1During ＞ 1；
By R1And R2Numerical value understand, R1＜ -1 and R2＞ 1, meets the condition of this situation.Such a situation explanation, the first machine
Transmission side warp tension ratio fore side tension force between frame and the second frame measured by the first tonometry roller is small, and difference is more than 1 ton, i.e.,
There is lateral bending in the band between the first frame and the second frame, and lateral bending direction is fore side.By the bilateral for correcting the second frame
After roll gap difference, the transmission side warp tension ratio fore side tension force between the second frame and the 3rd frame measured by the second tonometry roller is big
There is lateral bending in the band between more than 1 ton, i.e. the second frame and the 3rd frame, and lateral bending direction is transmission side.This shows in amendment
During the bilateral roll gap difference of the second frame, there is the phenomenon of accommodative excess, the lateral bending direction of band is changed into biography from fore side
Dynamic side, i.e. q2Absolute value it is excessive.Can be by correction factor k2Self study is carried out to reduce q2Value, and by repairing after self study
Positive coefficient k '2Calculating for base in the middle of next piece.k′2Calculating formula be：
(2) R is worked asn＞ 1 and Rn+1During ＜ -1；
By R1And R2Numerical value understand, R2＞ 1 and R3＜ -1, meets the condition of this situation.Such a situation explanation, the second machine
Frame and the 3rd interstand tension measurement roller measured by transmission side warp tension ratio fore side tension force it is big more than 1 ton, i.e. the second frame and
There is lateral bending in the band between the 3rd frame, and lateral bending direction is transmission side.After correcting the bilateral roll gap difference of the 3rd frame,
Transmission side warp tension ratio fore side tension force measured by 3rd frame and the 4th interstand tension measurement roller is small, and difference is more than 1 ton,
That is there is lateral bending in the band between the 3rd frame and the 4th frame, and lateral bending direction is fore side.This shows correcting the 3rd frame
Bilateral roll gap difference when, there is the phenomenon of accommodative excess, the lateral bending direction of band is changed into fore side, i.e. q from transmission side3
Absolute value it is excessive.Can be by correction factor k3Self study is carried out to reduce q3Value, and by the correction factor k ' after self study3
Calculating for base in the middle of next piece.k′3Calculating formula be：
Claims (5)
1. the band afterbody method for correcting error of a kind of Continuous mill train, it is characterised in that comprise the following steps：
A, setting band afterbody correction program enabling signal, when the metal detector for being arranged in Continuous mill train porch is detected
Start band afterbody correction program during the afterbody of middle base rolled piece；
B, calculating and amendment Continuous mill train the second frame bilateral roll gap difference：Collection is arranged between the first frame and the second frame
The actual Value Data of the tension force of mill drive side and fore side measured by first tonometry roller and be arranged in the second frame and
The actual Value Data of the tension force of mill drive side and fore side measured by the second tonometry roller between 3rd frame, calculates second
The correction of frame bilateral roll gap difference, corrects the second frame bilateral roll gap；
C, calculating and the remaining frame bilateral roll gap difference of amendment Continuous mill train：Thrown when band from the second frame roll gap by amendment
When going out, and marching to the pressure tap of tonometry roller, collection is arranged in the second tonometry between the second frame and the 3rd frame
The actual Value Data of the tension force of mill drive side and fore side measured by roller and it is arranged between the 3rd frame and the 4th frame
The actual Value Data of the tension force of mill drive side and fore side measured by 3rd tonometry roller, calculates the bilateral roller of the 3rd frame
The correction of difference is stitched, the 3rd frame bilateral roll gap is corrected；By that analogy, calculate and correct the bilateral roll gap of remaining each frame；
D, the correction factor to frame bilateral roll gap difference correction carry out self study.
2. the band afterbody method for correcting error of Continuous mill train according to claim 1, it is characterised in that：In the middle of step A settings
The method of the enabling signal of base rolled piece afterbody correction program is as follows：
The tail position of middle base rolled piece is detected by the metal detector for being arranged in Continuous mill train porch, metal detection
The installation site of device is 20000≤D≤50000 with the span apart from D that Continuous mill train first roller is stitched, and unit is milli
Rice, the length of middle base is more than D, therefore in the early stage and mid-term of continuous rolling process, the signal of metal detector is always 1, is shown
Middle base rolled piece can be detected by the test position of metal detector, when the afterbody of middle base rolled piece leaves metal detection
During the test position of device, the signal of metal detector is changed into 0 from 1, shows that the afterbody of middle base rolled piece passes through metal detector
Test point, i.e., when metal detector detects trailing edge signal, middle base rolled piece afterbody correction program is sent to PLC system
Enabling signal, shows to proceed by middle base rolled piece afterbody correction control.
3. the band afterbody method for correcting error of Continuous mill train according to claim 1 or 2, it is characterised in that：Step B calculate and
The specific method for correcting Continuous mill train the second frame bilateral roll gap difference is as follows：
Assuming that the total frame number of Continuous mill train is N；Second frame transmission side roll gap is S2d, unit is millimeter；Second gantry operation side
Roll gap is S2o, unit is millimeter；The roll gap difference Q of second frame2=S2d-S2o, unit is millimeter；
When PLC system receives the enabling signal of middle base rolled piece afterbody correction program, between the first frame and the second frame
The average value for 10~30 transmission side tension force actual values that first tonometry roller is continuously measured is T1d, unit is ton；First machine
The average value for 10~30 fore side tension force actual values that the first tonometry roller between frame and the second frame is continuously measured is T1o,
Unit is ton；After measurement terminates, the bilateral tension force measured by the first tonometry roller between the first frame and the second frame is calculated
The difference R of the average value of actual value1For：
R1=T1d-T1o
Unit is ton；
If calculating R1Absolute value be more than 1 ton hour, it was demonstrated that there is sideslip situation in the afterbody of middle base, then according to R1Numerical value to
The roll gap difference of two frames is modified；Assuming that the correction of the second frame roll gap difference is q2, unit is millimeter, it is assumed that q2≥
0, the correction factor of the second frame roll gap difference correction is k2, k2Initial value be 1, the second frame roll gap difference after being corrected
Q2'=Q2+q2, unit is millimeter；
The roll gap difference correction of second frame and the average value of the bilateral tension force actual value measured by the first tonometry roller
The corresponding relation of difference is as shown in the table：
Complete after above-mentioned calculating, control the second machine frame rolling mill transmission side and fore side hydraulic cylinder to repair roll gap difference by PLC system
Just to Q2′。
4. the band afterbody method for correcting error of Continuous mill train according to claim 3, it is characterised in that：Step C is calculated and repaiied
The specific method of the positive remaining frame bilateral roll gap difference of Continuous mill train is as follows：
After the amendment to the bilateral roll gap difference of the n-th frame is completed, it is assumed that 2≤n≤N-1, start to calculate and repaiied through roll gap difference
The strip material portion rolled after just marches to what is undergone during the pressure tap of the n-th tonometry roller between the n-th frame and the (n+1)th frame
Time tn, unit is the second；
Assuming that the transmission side tension force actual value between the n-th frame and the (n+1)th frame measured by the n-th tonometry roller is Tnd, unit is
Ton；Fore side tension force actual value measured by n-th frame and the (n+1)th interstand tension measurement roller is Tno, unit is ton, wherein n
≤N；Now, it is assumed that the (n+1)th frame transmission side roll gap is S(n+1)d, unit is millimeter；(n+1)th gantry operation side roller is stitched
S(n+1)o, unit is millimeter；The roll gap difference Q of (n+1)th framen+1=S(n+1)d-S(n+1)o, unit is millimeter；Assuming that the n-th frame
Mill speed is Vn, unit is mm/second；Advancing slip value is wn；N-th rack outlet window of web velocities is vn, unit is mm/second, then
vnCalculating formula is：
vn=Vn(1+wn)
The distance of pressure tap at the roll gap of known n-th frame to the n-th tonometry roller is G, and unit is millimeter, then tn=G/vn,
Therefore, after the amendment to the bilateral roll gap difference of the n-th frame is completed, by tnStart to gather the n-th frame and (n+1)th after second
Bilateral tension force actual value measured by interstand tension measurement roller；The cycle that PLC system receives instrument detection data is 100 milliseconds
Within, it is assumed that 20 transmission side tension force actual values that now the n-th tonometry roller is continuously measured between the n-th frame and the (n+1)th frame
Average value be Tnd, unit is ton；20 fore sides that the n-th tonometry roller is continuously measured between n-th frame and the (n+1)th frame
The average value of power actual value is Tno, unit is ton, then the difference R of two average valuenFor：
Rn=Tnd-Tno
Unit is ton；
If difference RnAbsolute value be more than 1 ton hour, it was demonstrated that after bilateral roll gap difference amendment of the afterbody of middle base by the n-th frame
There are still sideslip situation, then according to difference RnNumerical value the roll gap difference of the (n+1)th frame is modified；Assuming that the (n+1)th machine
The correction of frame roll gap difference is qn+1, unit is millimeter, it is assumed that qn+1>=0, the amendment system of the (n+1)th frame roll gap difference correction
Number is kn+1；Roll gap difference Q ' after being correctedn+1=Qn+1+qn+1, unit is millimeter；
Pair of the roll gap difference correction of (n+1)th frame and the difference of the bilateral tension force actual value measured by the n-th tonometry roller
It should be related to as shown in the table：
Complete after above-mentioned calculating, control the (n+1)th machine frame rolling mill transmission side and fore side hydraulic cylinder to repair roll gap difference by PLC system
Just to Q 'n+1。
5. the band afterbody method for correcting error of Continuous mill train according to claim 4, it is characterised in that：Step D is double to frame
The method that the correction factor of side roller seam difference correction carries out self study is as follows：
After the afterbody correction of base in the middle of one piece is completed, R can obtain1, R2, R3…RN-1Ordered series of numbers, the ordered series of numbers is scanned for,
When finding following two situations, self study need to be carried out to the correction factor of the bilateral roll gap difference correction of the (n+1)th frame：
(1) R is worked asn＜ -1 and Rn+1During ＞ 1；
Such a situation explanation, the transmission side warp tension ratio fore side between the n-th frame and the (n+1)th frame measured by the n-th tonometry roller
Tension force is small, and the band that difference is more than between 1 ton, i.e. the n-th frame and the (n+1)th frame has lateral bending, and lateral bending direction is fore side,
After correcting the bilateral roll gap difference of the (n+1)th frame, between the (n+1)th frame and the n-th+2 frame measured by the (n+1)th tonometry roller
Transmission side warp tension ratio fore side tension force be more than band between more than 1 ton, i.e. the (n+1)th frame and the n-th+2 frame and there is lateral bending, and
Lateral bending direction is transmission side, and this shows, when correcting the bilateral roll gap difference of the (n+1)th frame, there is the phenomenon of accommodative excess, make
The lateral bending direction of band is changed into transmission side, i.e. q from fore siden+1Absolute value it is excessive, can be by correction factor kn+1Carry out
Self study reduces qn+1Value, and by the correction factor k ' after self studyn+1For the calculating of base in the middle of next piece, k 'n+1Calculating
Formula is：
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(2) R is worked asn＞ 1 and Rn+1During ＜ -1；
Such a situation explanation, the transmission side warp tension ratio fore side between the n-th frame and the (n+1)th frame measured by the n-th tonometry roller
There is lateral bending in the band that tension force is more than between more than 1 ton, i.e. the n-th frame and the (n+1)th frame, and lateral bending direction is transmission side；By
After the bilateral roll gap difference for correcting the (n+1)th frame, the biography between the (n+1)th frame and the n-th+2 frame measured by the (n+1)th tonometry roller
Dynamic side warp tension ratio fore side tension force is small, and the band that difference is more than between 1 ton, i.e. the (n+1)th frame and the n-th+2 frame has lateral bending,
And lateral bending direction is fore side, this shows, when correcting the bilateral roll gap difference of the (n+1)th frame, there is the phenomenon of accommodative excess,
The lateral bending direction of band is set to be changed into fore side, i.e. q from transmission siden+1Absolute value it is excessive, can be by correction factor kn+1Enter
Row self study reduces qn+1Value, and by the correction factor k ' after self studyn+1For the calculating of base in the middle of next piece, k 'n+1Meter
Formula is identical with formula (1).
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