CN109047340A - A kind of control method of hot fine rolling multistage threading speed - Google Patents
A kind of control method of hot fine rolling multistage threading speed Download PDFInfo
- Publication number
- CN109047340A CN109047340A CN201710443910.0A CN201710443910A CN109047340A CN 109047340 A CN109047340 A CN 109047340A CN 201710443910 A CN201710443910 A CN 201710443910A CN 109047340 A CN109047340 A CN 109047340A
- Authority
- CN
- China
- Prior art keywords
- strip
- rack
- speed
- finishing mill
- temperature
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/02—Profile, e.g. of plate, hot strip, sections
Abstract
The present invention relates to a kind of control methods of hot fine rolling multistage threading speed, mainly solve the low technical problem of existing hot fine rolling band steel temperature control precision.The method of the present invention, comprising the following steps: S1, calculate strip in the initial threading speed of each rack of finishing mill；S2, speed of the strip by each rack before finishing mill deceleration rack when is calculated；S3, the strip target velocity after finishing mill raising speed rack is slowed down is determined；S4, the promotion ratio for correcting hot fine rolling multistage threading speed and determining similar belt steel temperature next time promote correction value.The method of the present invention improves the requirement that hot fine rolling band steel temperature control precision meets finishing temperature.
Description
Technical field
The present invention relates to a kind of control method of hot-rolling plate belt steel rolling speed, in particular to a kind of hot fine rolling is multistage
The control method of threading speed belongs to hot continuous rolling fine-rolling strip steel production control field.
Background technique
Hot fine rolling band steel head temperature accurately controls the stability for directly influencing strip threading, finish rolling finishing temperature
Precision and product lumber recovery.The height of finishing temperature, not only has an impact roll-force and sharing of load, and to heat
The interior tissue performance and its mechanical performance for rolling strip can also have an important influence on.If finishing temperature is too low, the gold of strip
It is bad to belong to plasticity, yield limit reduces, and elongation reduces, the deep drawability of coil of strip especially after influence cold rolling.
What the control of strip steel head temperature was typically all the threading speed that calculates by model to realize, in actual production
In, for plate thickness > 2.3mm Deformation in thick, finishing temperature can achieve in the temperature of goal-setting by the adjustment of threading speed.
And for plate thickness≤2.3mm specification Thin Strip Steel, when finish to gauge target temperature is 880 DEG C or more, the actual temperature of strip steel head
Both less than finish to gauge target temperature, to influence the hit rate and strip property of finishing temperature.
The mill speed of hot fine rolling is adjusted, especially raising threading speed, improve rolling rhythm, reduced strip steel head and exist
The temperature drop in finish rolling area is in theory more feasible, effective, but if improving threading speed simply, may be made
Set is played on laminar flow roller-way at strip, strip is unstable in threading, the problems such as causing finish rolling steel scrap.
This can effectively be solved the problems, such as by the method for hot fine rolling multistage threading at present, it is by utilizing machine before finish rolling
Frame, such as F0-F2 have the characteristics that larger raising speed space because the thicker threading speed of strip is smaller, reach and promote strip steel head temperature
Purpose.
A kind of two-stage threading method for controlling finishing temperature of the Chinese patent application of application publication number CN103252359A, it is public
The technical solution opened is, first determines level-one threading speed and second level threading speed, in strip into using level-one threading speed before finish rolling
Degree, after strip steel head enters the F2 rack of finishing mill, is transferred to second level threading speed.
A kind of hot fine rolling multistage threading method for control speed of the Chinese patent application of application publication number CN103170506A,
Disclosed technical solution: first determining initial threading speed, when the finishing temperature monitored is lower than target temperature, by predetermined speed-raising
Ratio improves the speed of the first rack, if the belt steel temperature detected is also less than target temperature, improves in the same ratio that promoted
Second gantry speed of lower piece of strip, and so on, after the last one speed-raising rack stings steel, it is restored to original corresponding initial
Threading speed.
The method that the Chinese patent application of application publication number CN104438359A improves hot-strip head temperature, it is disclosed
Technical solution: when strip steel head threading, allowing upstream stand, usually F1, F2, F3, using the threading speed for being higher than conventional speeds
Degree, i.e., the level-one threading speed in invention switch rack in centre, usually F3, F4, shift down to conventional threading speed,
The threading of downstream rack is completed, and determines the promotion ratio of first-order rate according to conventional threading speed, it is public in specific embodiment
What is opened is the promotion ratio that level-one threading speed is inputted from operation interface.But there is also limitations for foregoing invention: one, raise speed ratio thing
It first fixes, can not accurately guarantee strip steel head temperature for a long time, if by adjusting same specification strip is mentioned with a fixed promotion ratio
The first and second gantry speed of finish rolling is risen, speed-raising rack number also reaches maximum, obtained preferable strip steel head temperature, but finish rolling
Inlet temperature head temperature be not it is unalterable, the fluctuation in ± 10 degree of same size strip steel head temperature is very normal
, since initial threading speed has arrived limit, entry temperature at finishing is 10 degree low, will lead to exit temperature at finishing same low 10
Degree.Two, speed-raising ratio is fixed in advance, and actual temperature is lower than target temperature after the speed-raising of the first rack, and the second rack of speed-raising is again high
In target temperature, will cause every piece of strip steel head temperature and shake back and forth, do not reach requirement always, need artificially to speed-raising ratio into
Row amendment, can not be according to strip steel head temperature low spot automatic lifting speed.
Summary of the invention
The object of the present invention is to provide a kind of control methods of hot fine rolling multistage threading speed, mainly solve existing hot rolling
The low technical problem of fine-rolling strip steel temperature control precision, meets the requirement of finishing temperature.
The technical solution adopted by the present invention, a kind of control method of hot fine rolling multistage threading speed, comprising the following steps:
S1, strip is calculated in the initial threading speed of each rack of finishing mill, band is read according to steel classification and product specification
The sharing of load coefficient of steel calculates each rack thickness of finish rolling according to the workpiece thickness of product and finish rolling target thickness, according to production
The finish rolling target temperature that product require calculates the initial threading speed of strip；
S2, speed of the strip by each rack before finishing mill deceleration rack when is calculated, is come into operation according to multistage threading function
Mark, belt steel temperature lifting values, belt steel temperature promote the maximum value meter that correction value, finishing mill deceleration rack and strip promote speed
Speed when each rack before strip passes through finishing mill deceleration rack is calculated, and determines that strip speed promotes ratio；
S3, the strip target velocity after finishing mill raising speed rack is slowed down is determined, strip is after finishing mill deceleration rack stings steel
Slow down, strip is decelerated to the speed of requirement according to deceleration ratio by corresponding rack；
S4, the promotion ratio for correcting hot fine rolling multistage threading speed and determining similar belt steel temperature next time promote amendment
Value, to the carry out temperature sampling of strip steel head temperature section, obtains the low spot value of temperature sampling, finishing stand setup model is low according to temperature
Point determines that next time, similar belt steel temperature promoted correction value.
The step S1 the following steps are included:
S11 takes table, according to the steel classification of current rolled band steel, level of thickness and width class information, from course of hot rolling
Control the reduction ratio distribution coefficient that each rack of the other finishing mill of equivalent layer is taken out in computer art protocol tableI is finishing mill
Shelf number；
S12 calculates the steel strip thickness of each rack outlet of finishing mill, the steel strip thickness exported according to workpiece thickness H, finish rolling
H and each rack of finishing mill depress rate coefficientThe steel strip thickness of each rack outlet of finishing mill is calculated by formula 1,
hi=hi-1-diI=1,6, formula 1, in formula 1,
Hi is the steel strip thickness of the i-th rack outlet of finishing mill, h0=H-d0, H is workpiece thickness；
diFor the drafts of the i-th rack of finishing mill,I=0 ..., 6；H is the band of finish rolling outlet
Steel thickness；ε be each rack of finishing mill depress rate coefficient and,
S13 calculates the second flow of strip, the initial threading speed s of strip is arranged, according to finish rolling target thickness h, by formula 2
The second flow m of strip is calculated,
M=s*h formula 2, in formula 2, m is the second flow of strip, and s is initial threading speed；H is band after finish rolling
The target thickness of steel；
S14 calculates the strip speed s of each rack of finishing milli, according to each rack thickness hi, second flow m and second flow it is equal
Principle is calculated the strip speed s of each rack of finishing mill by formula 3i, finish rolling, which is obtained by calculation, terminates belt steel temperature T0,
si=m/hiFormula 3, in formula 3, siFor the strip speed of the i-th rack of finishing mill, hiFor the i-th rack of finishing mill
The steel strip thickness of outlet, i represent shelf number for 0 ..., 6, and m is the second flow that second flow is strip；
S15 compares T and T0Whether approach, T is that the finish rolling of product requirement terminates strip target temperature, and termination condition takes | T-
T0| < 1 degree, i.e. temperature T0It is close with target temperature T, otherwise to keep off；
S16, as temperature T and T0When close, the strip speed s of each rack of finishing mill is obtainediWith the initial second flow m of strip.
S17, as temperature T and T0When keeping off, step S13, S14, S15 are repeated.
The step be S2 the following steps are included:
S21 takes table, is classified according to steel grade and steel classification, thickness width, from hot rolling technology protocol table and Model Self-Learning
Multistage threading function is obtained in table and is come into operation indicates f, belt steel temperature lifting values t1, finishing mill deceleration shelf number n (n < 6) and strip speed
Spend the maximum value P, belt steel temperature self study value t of promotion ratio2；
S22 determines the fresh target temperature that strip finish rolling terminates, according to belt steel temperature lifting values t1, belt steel temperature correction amount
t2, fresh target temperature is determined by formula 4:
T'=T+t1+t2Formula 4, in formula 4, T' is the fresh target temperature that strip finish rolling terminates, and T is that former finish rolling terminates
Target temperature.
S23 determines the raising speed rack and non-raising speed rack of finishing mill, determines finish rolling according to the deceleration shelf number n of finishing mill
The raising speed rack and non-raising speed rack of machine, finishing mill raising speed rack are 0, n, raising speed rack is not n+ to finishing mill
1,6；
S24 calculates the strip second flow of finishing mill raising speed rack, determines the initial raising speed ratio p' of strip, calculates by formula 5
The strip second flow of raising speed rack,
M'=m*p' formula 5, in formula 5, m' is the strip second flow of finishing mill raising speed rack, and m is to flow the second of strip
Amount, p' are the initial raising speed ratio of strip, and p' is 0~P；
S25 calculates the strip speed of finishing mill raising speed rack, and the speed of finishing mill raising speed rack is calculated by formula 6,
s'i=m'/hiFormula 6, in formula 6, s'iFor finishing mill the i-th rack raising speed gantry speed, i=0 ..., n；m'
For the strip second flow of finishing mill raising speed rack, hiFor the steel strip thickness of the i-th rack outlet of finishing mill, i is 0 ..., 6, is represented
The shelf number of finishing mill；
S26 calculates strip exit temperature at finishing T ", according to finishing mill raising speed rack and non-raising speed gantry speed, thickness gauge
Calculate exit temperature at finishing T "；
S27 compares and calculates whether temperature T " and fresh target temperature T' approaches, and termination condition takes | T "-T'| < 1 degree, i.e. temperature
T " and fresh target temperature T' is close, otherwise to keep off；
S28 calculates strip raising speed ratio in formula 7 when temperature T " and fresh target temperature T' are close,
P'=m'/m formula 7, in formula 7, m' is the strip second flow of finishing mill raising speed rack, and p' is the initial raising speed of strip
Ratio, m are the second flow that second flow is strip；
S29 repeats step S24, S25, S26, S27 when temperature T " and fresh target temperature T' is kept off.
The step S3 the following steps are included:
S31, the multistage threading function of Basic automation control system receiving, which comes into operation, indicates f, deceleration shelf number n, raising speed ratio
P', finishing mill raising speed gantry speed s 'i(i=0 ..., n), finishing mill not raising speed gantry speed si(i=n+1 ..., 6), finish rolling
The steel strip thickness h of each rack of machinei；
S32, Basic automation control system indicates according to f determines whether multistage threading function comes into operation, according to deceleration rack
Number beginning rack to be slowed down of n determination；
S33 when strip enters finish rolling, controls finishing mill raising speed rack with speed s 'i(i=0 ..., n) is run,
S34 calculates the target velocity after finishing mill raising speed rack is slowed down, after the deceleration rack n of finishing mill stings steel, finish rolling
The raising speed rack of machine reduces speed now, finishing mill raising speed rack n+1 rack sting steel front reduction gear to target velocity s " (i=0 ...,
N), the target velocity after finishing mill raising speed rack is slowed down is calculated by formula 8,
s″i=s 'i/ p'(i=0 ..., n) formula 8, in formula 8, s " is the strip mesh after finishing mill raising speed rack is slowed down
Speed is marked, p' is the initial raising speed ratio of strip, s 'iFor the strip speed of finishing mill raising speed rack.
The step S4 the following steps are included:
S41, calculates strip multistage threading temperature corrected value, and strip takes band using above-mentioned speed control and after the completion of rolling
The practical finish rolling outlet head section temperature of steel determines the temperature low spot t of strip sampling section according to strip steel head section temperature3, by formula 9
Calculate strip multistage threading temperature corrected value t'2,
t'2=t2+g*(T'-t3) formula 9, in formula 9, g is regulation coefficient, is set as 0.3；t3For the strip for sampling section
Temperature low spot, T' are the fresh target temperature that strip finish rolling terminates, t2For strip multistage threading temperature corrected value, t'2It is more for new strip
Grade threading temperature corrected value；
S42 corrects multistage threading speed and promotes ratio p', by promoting correction value t to temperature2Adjust automatically, automatically
It corrects multistage threading speed and promotes ratio p', the temperature lifting values of the product is made to reach technology establishment requirement.
The speed of each rack of finishing mill of the present invention, which calculates, abides by second flow equal principle, the i.e. second flow of each rack of finishing mill
It is equal.
Step S12 of the present invention is according to product specification (strip target thickness and workpiece thickness after finish rolling) and technique
Reduction ratio sharing of load coefficient, calculate the steel strip thickness h of each rack outlet of finishing mill automaticallyi；
Step S13, S14, S15, S16, S17 of the present invention iterate to calculate exit temperature at finishing by the adjustment of threading speed,
When the exit temperature at finishing of calculating is equal or close with finish rolling target end temperature, iterative calculation terminates, and it is each to obtain finishing mill
Gantry speed siWith initial second flow m.
Step S22 temperature lifting values t of the present invention1, technique can be respectively set according to steel grade, product specification, to meet not
Same product requirement.
Step S24, S25, S26, S27 of the present invention iterate to calculate finish rolling by the adjustment of finishing mill raising speed rack threading speed
Outlet temperature, when the strip exit temperature at finishing of calculating and the equal or close new finish rolling target end temperature of strip, iteration meter
Terminate, obtains the strip speed and strip second flow m' of raising speed rack.
Step S33, S34 of the present invention, equal finishing mill raising speed rack strip second flow is m', finishing mill not raising speed rack band
Steel second flow is m, respectively meets strip second flow equal principle, slows down after finishing mill deceleration rack n stings steel, in finish rolling
Machine n+1 rack stings steel front reduction gear to strip target velocity si, since the strip second flow after slowing down is exactly m, do not risen with finishing mill
The strip second flow of fast rack is consistent, and meets strip second flow equal principle.
The belt steel temperature correction value t of step S22, S41, S42 of the present invention2, mainly carried out according to strip steel head temperature low spot
Adjust automatically, belt steel temperature correction value is different, and the strip raising speed ratio p' calculated is also different；Pass through belt steel temperature correction value
Adjustment, the belt steel temperature for requiring strip steel head temperature and technique are promoted close.
The present invention has following good effect compared with prior art: 1, the present invention can be arranged temperature according to product requirement and mention
It appreciates, can satisfy various products specification requirement.2, the present invention can calculate raising speed ratio automatically, improve speed and calculate and roll
The precision that power processed calculates keeps finish rolling rolling more stable.3, the present invention can carry out raising speed ratio according to head temperature low spot
Adjust automatically improves the control precision of strip steel head temperature.
Detailed description of the invention
Fig. 1 is the control method flow diagram of hot fine rolling multistage threading speed of the present invention
Fig. 2 is the initial threading speed of the method for the present invention and strip volume per second control flow diagram
Fig. 3 is the method for the present invention strip speed raising speed ratio control flow schematic diagram
Specific embodiment
Referring to Fig.1, Fig. 2, Fig. 3, a kind of control method of hot fine rolling multistage threading speed, comprising the following steps:
S1, strip is calculated in the initial threading speed of each rack of finishing mill, band is read according to steel classification and product specification
The sharing of load coefficient of steel calculates each rack thickness of finish rolling according to the workpiece thickness of product and finish rolling target thickness, according to production
The finish rolling target temperature that product require calculates the initial threading speed of strip；
S2, speed of the strip by each rack before finishing mill deceleration rack when is calculated, is come into operation according to multistage threading function
Mark, belt steel temperature lifting values, belt steel temperature promote the maximum value meter that correction value, finishing mill deceleration rack and strip promote speed
Speed when each rack before strip passes through finishing mill deceleration rack is calculated, and determines that strip speed promotes ratio；
S3, the strip target velocity after finishing mill raising speed rack is slowed down is determined, strip is after finishing mill deceleration rack stings steel
Slow down, strip is decelerated to the speed of requirement according to deceleration ratio by corresponding rack；
S4, the promotion ratio for correcting hot fine rolling multistage threading speed and determining similar belt steel temperature next time promote amendment
Value, to the carry out temperature sampling of strip steel head temperature section, obtains the low spot value of temperature sampling, finishing stand setup model is low according to temperature
Point determines that next time, similar belt steel temperature promoted correction value.
The step S1 the following steps are included:
S11 takes table, according to the steel classification of current rolled band steel, level of thickness and width class information, from course of hot rolling
Control the reduction ratio distribution coefficient that each rack of the other finishing mill of equivalent layer is taken out in computer art protocol tableI is finishing mill
Shelf number；
S12 calculates the steel strip thickness of each rack outlet of finishing mill, the steel strip thickness exported according to workpiece thickness H, finish rolling
H and each rack of finishing mill depress rate coefficientThe steel strip thickness of each rack outlet of finishing mill is calculated by formula 1,
hi=hi-1-diI=1,6, formula 1, in formula 1,
Hi is the steel strip thickness of the i-th rack outlet of finishing mill, h0=H-d0, H is workpiece thickness；
diFor the drafts of the i-th rack of finishing mill,I=0 ..., 6；H is the band of finish rolling outlet
Steel thickness；ε be each rack of finishing mill depress rate coefficient and,
S13 calculates the second flow of strip, the initial threading speed s of strip is arranged, according to finish rolling target thickness h, by formula 2
The second flow m of strip is calculated,
M=s*h formula 2, in formula 2, m is the second flow of strip, and s is initial threading speed；H is band after finish rolling
The target thickness of steel；
S14 calculates the strip speed s of each rack of finishing milli, according to each rack thickness hi, second flow m and second flow it is equal
Principle is calculated the strip speed s of each rack of finishing mill by formula 3i, finish rolling, which is obtained by calculation, terminates belt steel temperature T0,
si=m/hiFormula 3, in formula 3, siFor the strip speed of the i-th rack of finishing mill, hiFor the i-th rack of finishing mill
The steel strip thickness of outlet, i represent shelf number for 0 ..., 6, and m is the second flow that second flow is strip；
S15 compares T and T0Whether approach, T is that the finish rolling of product requirement terminates strip target temperature, and termination condition takes | T-
T0| < 1 degree, i.e. temperature T0It is close with target temperature T, otherwise to keep off；
S16, as temperature T and T0When close, the strip speed s of each rack of finishing mill is obtainediWith the initial second flow m of strip.
S17, as temperature T and T0When keeping off, step S13, S14, S15 are repeated.
The step be S2 the following steps are included:
S21 takes table, is classified according to steel grade and steel classification, thickness width, from hot rolling technology protocol table and Model Self-Learning
Multistage threading function is obtained in table and is come into operation indicates f, belt steel temperature lifting values t1, finishing mill deceleration shelf number n (n < 6) and strip speed
Spend the maximum value P, belt steel temperature self study value t of promotion ratio2；
S22 determines the fresh target temperature that strip finish rolling terminates, according to belt steel temperature lifting values t1, belt steel temperature correction amount
t2, fresh target temperature is determined by formula 4:
T'=T+t1+t2Formula 4, in formula 4, T' is the fresh target temperature that strip finish rolling terminates, and T is that former finish rolling terminates
Target temperature.
S23 determines the raising speed rack and non-raising speed rack of finishing mill, determines finish rolling according to the deceleration shelf number n of finishing mill
The raising speed rack and non-raising speed rack of machine, finishing mill raising speed rack are 0, n, raising speed rack is not n+ to finishing mill
1,6；
S24 calculates the strip second flow of finishing mill raising speed rack, determines the initial raising speed ratio p' of strip, calculates by formula 5
The strip second flow of raising speed rack,
M'=m*p' formula 5, in formula 5, m' is the strip second flow of finishing mill raising speed rack, and m is the second flow of strip,
P' is the initial raising speed ratio of strip, and p' is 0~P；
S25 calculates the strip speed of finishing mill raising speed rack, and the speed of finishing mill raising speed rack is calculated by formula 6,
s'i=m'/hiFormula 6, in formula 6, s'iFor finishing mill the i-th rack raising speed gantry speed, i=0 ..., n；M' is
The strip second flow of finishing mill raising speed rack, hiFor the steel strip thickness of the i-th rack outlet of finishing mill, i is 0 ..., 6, represents essence
The shelf number of milling train；
S26 calculates strip exit temperature at finishing T ", according to finishing mill raising speed rack and non-raising speed gantry speed, thickness gauge
Calculate exit temperature at finishing T "；
S27 compares and calculates whether temperature T " and fresh target temperature T' approaches, and termination condition takes | T "-T'| < 1 degree, i.e. temperature
T " and fresh target temperature T' is close, otherwise to keep off；
S28 calculates strip raising speed ratio in formula 7 when temperature T " and fresh target temperature T' are close,
P'=m'/m formula 7, in formula 7, m' is the strip second flow of finishing mill raising speed rack, and p' is the initial raising speed of strip
Ratio, m are the second flow that second flow is strip；
S29 repeats step S24, S25, S26, S27 when temperature T " and fresh target temperature T' is kept off.
The step S3 the following steps are included:
S31, the multistage threading function of Basic automation control system receiving, which comes into operation, indicates f, deceleration shelf number n, raising speed ratio
P', finishing mill raising speed gantry speed s 'i(i=0 ..., n), finishing mill not raising speed gantry speed si(i=n+1 ..., 6), finish rolling
The steel strip thickness h of each rack of machinei；
S32, Basic automation control system indicates according to f determines whether multistage threading function comes into operation, according to deceleration rack
Number beginning rack to be slowed down of n determination；
S33 when strip enters finish rolling, controls finishing mill raising speed rack with speed s 'i(i=0 ..., n) is run,
S34 calculates the target velocity after finishing mill raising speed rack is slowed down, after the deceleration rack n of finishing mill stings steel, finish rolling
The raising speed rack of machine reduces speed now, finishing mill raising speed rack n+1 rack sting steel front reduction gear to target velocity s " (i=0 ...,
N), the target velocity after finishing mill raising speed rack is slowed down is calculated by formula 8,
s″i=s 'i/ p'(i=0 ..., n) formula 8, in formula 8, s " is the strip mesh after finishing mill raising speed rack is slowed down
Speed is marked, p' is the initial raising speed ratio of strip, s 'iFor the strip speed of finishing mill raising speed rack.
The step S4 the following steps are included:
S41, calculates strip multistage threading temperature corrected value, and strip takes band using above-mentioned speed control and after the completion of rolling
The practical finish rolling outlet head section temperature of steel determines the temperature low spot t of strip sampling section according to strip steel head section temperature3, by formula 9
Calculate strip multistage threading temperature corrected value t'2,
t'2=t2+g*(T'-t3) formula 9, in formula 9, g is regulation coefficient, is set as 0.3；t3For the strip for sampling section
Temperature low spot, T' are the fresh target temperature that strip finish rolling terminates, t2For strip multistage threading temperature corrected value, t'2It is more for new strip
Grade threading temperature corrected value；
S42 corrects multistage threading speed and promotes ratio p', by promoting correction value t to temperature2Adjust automatically, automatically
It corrects multistage threading speed and promotes ratio p', the temperature lifting values of the product is made to reach technology establishment requirement.
Embodiment 1, strip parameter is as follows, and workpiece thickness H is 35.593mm, and steel strip thickness h is after finish rolling
2.0mm, strip width 1020mm, it is 860 DEG C, steel grade SPHC that finish rolling, which terminates temperature T, steel classification 3, level of thickness 102,
Its each rack read depresses rate coefficientWith the steel strip thickness h of each rack of finish rolling calculated by formula 1iIt is shown in Table 1.
1 strip of the embodiment of the present invention of table passes through the reduction ratio of each rack of finish rollingWith steel strip thickness hi
| Classification | F0 | F1 | F2 | F3 | F4 | F5 | F6 |
| Reduction ratio/% | 1 | 0.3608 | 0.2112 | 0.1091 | 0.0527 | 0.033 | 0.017 |
| Thickness/mm | 16.80 | 10.02 | 6.04 | 3.99 | 3.00 | 2.38 | 2.06 |
Pass through steel classification 3, level of thickness 102, deceleration the rack n, maximum raising speed rate P, temperature lifting values t of reading1, temperature
Spend correction value t2.See that hot rolling technology protocol table parameter is shown in Table 2.
2 hot rolling technology protocol table parameter of the embodiment of the present invention of table
Above-mentioned steps S1, according to product specification, the steel strip thickness of each rack of finishing mill, calculating the initial second flow m of strip is
1224.83mm*mpm, each rack strip speed s of finishing mill calculatedi, roll-force be shown in Table 3.
Initial threading speed s of 3 strip of the embodiment of the present invention of table in each rack of finishing milliWith rack roll-force
| Classification | F0 | F1 | F2 | F3 | F4 | F5 | F6 |
| Speed/mpm | 72.9 | 122.3 | 202.8 | 306.8 | 407.6 | 514.9 | 592.1 |
| Roll-force/ton | 1497 | 1138 | 1161 | 1089 | 844 | 787 | 643 |
Above-mentioned steps S2 comes into operation according to multistage threading function and indicates that f is 1, belt steel temperature lifting values t1For 6, belt steel temperature
Promote correction value t2It is 2 for 0, finish rolling deceleration rack n, the maximum value P that strip promotes speed is 0.2, calculates finishing mill raising speed machine
The strip second flow m' of frame is 1347.68mm*mpm, and the strip second flow m of the non-raising speed rack of finishing mill is 1224.83mm*mpm,
Strip raising speed rate p' is 0.10；The strip speed s' of its each rack of finishing mill calculatedi, roll-force be shown in Table 4.
Threading speed s' of 4 strip of the embodiment of the present invention of table in each rack of finish rollingiWith rack roll-force
| Classification | F0 | F1 | F2 | F3 | F4 | F5 | F6 |
| Speed/mpm | 80.2 | 134.4 | 223.1 | 306.8 | 407.6 | 514.9 | 592.1 |
| Roll-force/ton | 1501 | 1132 | 1151 | 1061 | 824 | 769 | 623 |
Above-mentioned steps S3, Basic automation control system carry out speed control according to 4 data of table；It is come into operation according to multistage threading
Mark 1, finish rolling deceleration shelf number 2, before finish rolling F2 rack stings steel, each rack strip speed of finishing mill is the speed of table 4；Work as essence
It rolls after F2 rack stings steel, carries out deceleration control, before finishing mill F3 rack stings steel, strip speed is reduced to target velocity and decelerated to
The speed of finishing mill F0, F1, F2 rack of table 3, finishing mill F3, F4, F5, F6 rack are controlled by former strip speed, until
Finishing mill F6 rack stings steel, completes the entire control process of multistage threading.
Above-mentioned steps S4, after which completes rolling, the strip steel head temperature low spot t of sampling3It is 858 DEG C, temperature
Promote correction value t'2=0+ (860+6-858) * 0.5=4.
If lower piece of strip is same specification strip, then calculates lower piece of strip by step S1, S2, S3, S4 model,
Control.
Such as, by steel classification 3, the course of hot rolling of level of thickness 102, reading controls computer art protocol table data,
Come into operation mark 1, belt steel temperature lifting values 6, belt steel temperature of multistage threading function promotes correction value 4, finishing mill deceleration rack 2 and band
Steel promotes the maximum value 0.2 of speed, the strip of the finishing mill raising speed rack for the lower piece of same specification strip that finishing stand setup model calculates
Second flow is 1409.11mm*mpm, and the strip second flow of the non-raising speed rack of finishing mill is 1224.83mm*mpm, strip raising speed rate
It is 0.15；The strip speed of its each rack of finishing mill calculated, each rack roll-force are shown in Table 5.
The strip of lower piece of same specification of 5 embodiment of the present invention of table rolling passes through each rack s of finish rollingiSpeed and each rack
Roll-force
| Classification | F0 | F1 | F2 | F3 | F4 | F5 | F6 |
| Speed/mpm | 83.9 | 140.5 | 233.2 | 306.8 | 407.6 | 514.9 | 592.1 |
| Roll-force/ton | 1508 | 1132 | 1148 | 1050 | 816 | 762 | 624 |
In this way, constantly adjusting raising speed ratio by the continuous adjustment to temperature corrected value, finish rolling head temperature being made to meet work
Skill requirement.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (5)
1. a kind of control method of hot fine rolling multistage threading speed, characterized in that the following steps are included:
S1, strip is calculated in the initial threading speed of each rack of finishing mill, strip is read according to steel classification and product specification
Sharing of load coefficient calculates each rack thickness of finish rolling according to the workpiece thickness of product and finish rolling target thickness, wants according to product
The finish rolling target temperature asked calculates the initial threading speed of strip；
S2, calculate speed of the strip by each rack before finishing mill deceleration rack when, according to multistage threading function come into operation mark,
Belt steel temperature lifting values, belt steel temperature promote the maximum value calculation band that correction value, finishing mill deceleration rack and strip promote speed
Steel pass through finishing mill deceleration rack before each rack when speed, and determine strip speed promoted ratio；
S3, the strip target velocity after finishing mill raising speed rack is slowed down is determined, strip carries out after finishing mill deceleration rack stings steel
Slow down, strip is decelerated to the speed of requirement according to deceleration ratio by corresponding rack；
S4, the promotion ratio for correcting hot fine rolling multistage threading speed and determining similar belt steel temperature next time promote correction value,
To the carry out temperature sampling of strip steel head temperature section, the low spot value of temperature sampling is obtained, finishing stand setup model is according to temperature low spot
Determine that next time, similar belt steel temperature promoted correction value.
2. a kind of control method of hot fine rolling multistage threading speed as described in claim 1, it is characterized in that: the step S1
The following steps are included:
S11 takes table, according to the steel classification of current rolled band steel, level of thickness and width class information, controls from course of hot rolling
The reduction ratio distribution coefficient of each rack of the other finishing mill of equivalent layer is taken out in computer art protocol tableI is the machine of finishing mill
Frame number；
S12, calculate each rack outlet of finishing mill steel strip thickness, according to workpiece thickness H, finish rolling export steel strip thickness h and
Each rack of finishing mill depresses rate coefficientThe steel strip thickness of each rack outlet of finishing mill is calculated by formula 1,
hi=hi-1-diI=1,6, formula 1, in formula 1,
Hi is the steel strip thickness of the i-th rack outlet of finishing mill, h0=H-d0, H is workpiece thickness；
diFor the drafts of the i-th rack of finishing mill,H is the strip of finish rolling outlet
Thickness；ε be each rack of finishing mill depress rate coefficient and,
S13 calculates the second flow of strip, and the initial threading speed s of strip is arranged, and according to finish rolling target thickness h, calculates by formula 2
The second flow m of strip is obtained,
M=s*h formula 2, in formula 2, m is the second flow of strip, and s is initial threading speed；H be finish rolling after strip mesh
Mark thickness；
S14 calculates the strip speed s of each rack of finishing milli, according to each rack thickness hi, second flow m and second flow equal principle,
The strip speed s of each rack of finishing mill is calculated by formula 3i, finish rolling, which is obtained by calculation, terminates belt steel temperature T0,
si=m/hiFormula 3, in formula 3, siFor the strip speed of the i-th rack of finishing mill, hiFor the band of the i-th rack outlet of finishing mill
Steel thickness, i represent shelf number for 0 ..., 6, and m is the second flow that second flow is strip；
S15 compares T and T0Whether approach, T is that the finish rolling of product requirement terminates strip target temperature, and termination condition takes | T-T0|<1
Degree, i.e. temperature T0It is close with target temperature T, otherwise to keep off；
S16, as temperature T and T0When close, the strip speed s of each rack of finishing mill is obtainediWith the initial second flow m of strip.
S17, as temperature T and T0When keeping off, step S13, S14, S15 are repeated.
3. a kind of control method of hot fine rolling multistage threading speed as described in claim 1, characterized in that the step S2
The following steps are included:
S21 takes table, is classified according to steel grade and steel classification, thickness width, from hot rolling technology protocol table and Model Self-Learning table
It obtains multistage threading function and comes into operation and indicate f, belt steel temperature lifting values t1, finishing mill deceleration shelf number n (n < 6) and strip speed mention
The maximum value P, belt steel temperature self study value t of the ratio of liter2；
S22 determines the fresh target temperature that strip finish rolling terminates, according to belt steel temperature lifting values t1, belt steel temperature correction amount t2, press
Formula 4 determines fresh target temperature:
T'=T+t1+t2Formula 4, in formula 4, T' is the fresh target temperature that strip finish rolling terminates, and T is former finish rolling target end temperature
Degree.
S23 determines the raising speed rack and non-raising speed rack of finishing mill, determines finishing mill according to the deceleration shelf number n of finishing mill
Raising speed rack and non-raising speed rack, finishing mill raising speed rack are 0, n, raising speed rack is not n+1 to finishing mill,
6；
S24 calculates the strip second flow of finishing mill raising speed rack, determines the initial raising speed ratio p' of strip, calculates raising speed by formula 5
The strip second flow of rack,
M'=m*p' formula 5, in formula 5, m' is the strip second flow of finishing mill raising speed rack, and m is the second flow of strip, and p' is
The initial raising speed ratio of strip, p' are 0~P；
S25 calculates the strip speed of finishing mill raising speed rack, and the speed of finishing mill raising speed rack is calculated by formula 6,
s'i=m'/hiFormula 6, in formula 6, s'iFor finishing mill the i-th rack raising speed gantry speed, i=0 ..., n；M' is finish rolling
The strip second flow of machine raising speed rack, hiFor the steel strip thickness of the i-th rack outlet of finishing mill, i is 0 ..., 6, represents finishing mill
Shelf number；
S26 calculates strip exit temperature at finishing T ", according to finishing mill raising speed rack and non-raising speed gantry speed, THICKNESS CALCULATION essence
Roll outlet temperature T "；
S27, compare calculate temperature T " and fresh target temperature T' whether approach, termination condition takes | T "-T'| < 1 degree, i.e. temperature T " and
Fresh target temperature T' is close, otherwise to keep off；
S28 calculates strip raising speed ratio in formula 7 when temperature T " and fresh target temperature T' are close,
P'=m'/m formula 7, in formula 7, m' is the strip second flow of finishing mill raising speed rack, and p' is the initial raising speed ratio of strip
Example, m is the second flow that second flow is strip；
S29 repeats step S24, S25, S26, S27 when temperature T " and fresh target temperature T' is kept off.
4. a kind of control method of hot fine rolling multistage threading speed as described in claim 1, characterized in that the step S3
The following steps are included:
S31, the multistage threading function of Basic automation control system receiving, which comes into operation, indicates f, deceleration shelf number n, raising speed ratio p', essence
Milling train raising speed gantry speed s 'i(i=0 ..., n), finishing mill not raising speed gantry speed si(i=n+1 ..., 6), finishing mill is each
The steel strip thickness h of racki；
S32, Basic automation control system indicates according to f determines whether multistage threading function comes into operation, true according to deceleration shelf number n
Surely the beginning rack to be slowed down；
S33 when strip enters finish rolling, controls finishing mill raising speed rack with speed s 'i(i=0 ..., n) is run,
S34 calculates the target velocity after finishing mill raising speed rack is slowed down, after the deceleration rack n of finishing mill stings steel, finishing mill
Raising speed rack reduces speed now, and finishing mill raising speed rack stings steel front reduction gear to target velocity s " (i=0 ..., n), essence in n+1 rack
Target velocity after milling train raising speed rack is slowed down is calculated by formula 8,
s″i=s 'i/ p'(i=0 ..., n) formula 8, in formula 8, s " is the strip target speed after finishing mill raising speed rack is slowed down
Degree, p' are the initial raising speed ratio of strip, s 'iFor the strip speed of finishing mill raising speed rack.
5. a kind of control method of hot fine rolling multistage threading speed as described in claim 1, it is characterized in that: the step S4
The following steps are included:
S41 calculates strip multistage threading temperature corrected value, and strip takes strip real using above-mentioned speed control and after the completion of rolling
Finish rolling outlet head section temperature in border determines the temperature low spot t of strip sampling section according to strip steel head section temperature3, calculated by formula 9
Strip multistage threading temperature corrected value t'2,
t'2=t2+g*(T'-t3) formula 9, in formula 9, g is regulation coefficient, is set as 0.3；t3Belt steel temperature for sampling section is low
Point, T' are the fresh target temperature that strip finish rolling terminates, t2For strip multistage threading temperature corrected value, t'2For new strip multistage threading
Temperature corrected value；
S42 corrects multistage threading speed and promotes ratio p', by promoting correction value t to temperature2Adjust automatically, automatic amendment is more
Grade threading speed promotes ratio p', and the temperature lifting values of the product is made to reach technology establishment requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710443910.0A CN109047340B (en) | 2017-06-13 | 2017-06-13 | Control method for hot rolling and finish rolling multistage threading speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710443910.0A CN109047340B (en) | 2017-06-13 | 2017-06-13 | Control method for hot rolling and finish rolling multistage threading speed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109047340A true CN109047340A (en) | 2018-12-21 |
| CN109047340B CN109047340B (en) | 2020-04-21 |
Family
ID=64676014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710443910.0A Active CN109047340B (en) | 2017-06-13 | 2017-06-13 | Control method for hot rolling and finish rolling multistage threading speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109047340B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112256718A (en) * | 2020-09-29 | 2021-01-22 | 中冶华天南京工程技术有限公司 | Hot continuous rolling rod wire rolling force energy checking and gearbox speed ratio calculating system based on B/S framework |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61253112A (en) * | 1985-05-02 | 1986-11-11 | Nippon Steel Corp | Control method for cooling steel plate |
| CN102069095A (en) * | 2009-11-20 | 2011-05-25 | 刘斌 | Statistical learning-based method for predicting and controlling finish rolling temperature in fine rolling |
| CN102125937A (en) * | 2010-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | Temperature control method in hot-rolled strip tailing-out process |
| CN102688894A (en) * | 2011-03-23 | 2012-09-26 | 宝山钢铁股份有限公司 | A controlling method for hot rolled strip threading of a continuous mill set |
| CN103170506A (en) * | 2011-12-20 | 2013-06-26 | 上海梅山钢铁股份有限公司 | Hot rolling and finish rolling multi-level threading speed control method |
| CN103252359A (en) * | 2012-02-15 | 2013-08-21 | 宝山钢铁股份有限公司 | Two-stage tape threading method for controlling finish rolling temperature |
| CN106925614A (en) * | 2017-03-29 | 2017-07-07 | 首钢京唐钢铁联合有限责任公司 | A kind of hot-strip finishing temperature control method based on speed regulation |
-
2017
- 2017-06-13 CN CN201710443910.0A patent/CN109047340B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61253112A (en) * | 1985-05-02 | 1986-11-11 | Nippon Steel Corp | Control method for cooling steel plate |
| CN102069095A (en) * | 2009-11-20 | 2011-05-25 | 刘斌 | Statistical learning-based method for predicting and controlling finish rolling temperature in fine rolling |
| CN102125937A (en) * | 2010-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | Temperature control method in hot-rolled strip tailing-out process |
| CN102688894A (en) * | 2011-03-23 | 2012-09-26 | 宝山钢铁股份有限公司 | A controlling method for hot rolled strip threading of a continuous mill set |
| CN103170506A (en) * | 2011-12-20 | 2013-06-26 | 上海梅山钢铁股份有限公司 | Hot rolling and finish rolling multi-level threading speed control method |
| CN103252359A (en) * | 2012-02-15 | 2013-08-21 | 宝山钢铁股份有限公司 | Two-stage tape threading method for controlling finish rolling temperature |
| CN106925614A (en) * | 2017-03-29 | 2017-07-07 | 首钢京唐钢铁联合有限责任公司 | A kind of hot-strip finishing temperature control method based on speed regulation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112256718A (en) * | 2020-09-29 | 2021-01-22 | 中冶华天南京工程技术有限公司 | Hot continuous rolling rod wire rolling force energy checking and gearbox speed ratio calculating system based on B/S framework |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109047340B (en) | 2020-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104942019B (en) | A kind of cold rolling of strip steel process Automatic control method of width | |
| CN103934278B (en) | A kind of hot fine rolling band steel method for controlling thickness | |
| CN107790505B (en) | A kind of cold continuous rolling tension dynamic setting method of stable rolling | |
| CN102974622B (en) | Parameter compensation method and control method for short stroke control of head-tail width of strip steel | |
| CN102266866B (en) | Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace | |
| CN103949481B (en) | Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality | |
| CN103170506B (en) | Hot rolling and finish rolling multi-level threading speed control method | |
| CN103785692A (en) | Method of producing strip steel with various target thicknesses in length direction through hot continuous rolling mill set | |
| CN106345819B (en) | A kind of control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability | |
| CN102179412A (en) | Control method of speed and acceleration of continuous hot rolling roughing rolling unit | |
| CN103962392A (en) | Dynamic load control method for hot continuous finishing mill group | |
| CN108405625A (en) | A kind of fair current roll-changing method for realizing the online roll change of ESP mm finishing mill units | |
| CN103008361B (en) | Method for controlling bending of steel plate head | |
| CN105499279B (en) | A kind of cold-strip plate shape feed forward control method | |
| CN104923568A (en) | Control method for preventing strip breaking during thin steel strip cold rolling process | |
| CN108637019A (en) | A kind of production method improving non-orientation silicon steel lumber recovery | |
| CN103042043A (en) | Method for controlling strip steel head and tail widths through coil box production process | |
| CN109047340A (en) | A kind of control method of hot fine rolling multistage threading speed | |
| CN106269908B (en) | Strip wedge shape autocontrol method based on heredity | |
| CN107661902A (en) | A kind of quick method for establishing cold-rolled process roller heat convex degree learning | |
| CN104338753A (en) | Flying gauge change control method of tandem cold mill | |
| CN103433298A (en) | Method for controlling tail portion of thin rolled container plate | |
| CN102581028B (en) | Hardness compensation method for controlling band steel hot-rolling molding process | |
| CN107042240B (en) | A kind of high precision plate strip rolling process dynamic variable specification implementation method based on feature point tracking | |
| CN106583463A (en) | Method for reducing strip head upwarping of pickling tandem cold milled strip steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |