CN104416135B - Roll gap calibration method for lightly pressing down tension leveler in square billet continuous casting - Google Patents
Roll gap calibration method for lightly pressing down tension leveler in square billet continuous casting Download PDFInfo
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- CN104416135B CN104416135B CN201310391254.6A CN201310391254A CN104416135B CN 104416135 B CN104416135 B CN 104416135B CN 201310391254 A CN201310391254 A CN 201310391254A CN 104416135 B CN104416135 B CN 104416135B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands
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Abstract
Disclosed is a roll gap calibration method for lightly pressing down a tension leveler in square billet continuous casting. The roll gap calibration method for lightly pressing down the tension leveler in the square billet continuous casting includes: a, selecting a standard chain pole as a calibrator, and setting a calibration reference value which comprises calibration pressure values and a calibration thickness value; b, starting the calibrator to complete a calibration motion, and reading and recording an actual detection value; c, calculating a deviation value according to the calibration reference value and the actual detection value, and performing correction and compensation according to the deviation value, wherein the calibration pressure values in the step a are respectively a minimum pressure value and a maximum pressure value, a pressure interval value is constituted by the minimum pressure value and the maximum pressure value, and the correction and the compensation in the step c are performed according to a two point linearity correction algorithm, and confirmed according to a linear function relationship between pressure and the thickness. The roll gap calibration method for lightly pressing down the tension leveler in the square billet continuous casting is achieved by using the multiple segment calibrator to achieve positioning once and automatically calibrating the pressure of multiple points, improves roll gap calibration accuracy when the tension leveler is pressed down in the square billet continuous casting, shortens calibration time, and improves calibration efficiency.
Description
Technical field
The invention belongs to continuous casting controls with detection technique field and in particular to one kind is gently pressed in billet continuous casting during iron and steel produces
Under tension leveler roller seam scaling method.
Background technology
In field of steel production, billet caster is mainly for the production of high-quality, high-grade, high added value wire rod, height
The raw material base material such as alloy pipe and bearing steel, bar.In order to control in square billet continuous casting incidental center segregation and
The Inner Quality of Billet defect such as center porosity, is maximally effective technology controlling and process means using soft reduction technique.Soft reduction technique is
Refer to, by applying uniform external force in liquid core of continuous casting billet end region, form the solidification shrinkage amount to compensate strand for certain decrement.
On the one hand this can eliminate or reduce strand and shrink the internal voids being formed, and prevents the molten steel of intergranular solute horizontal to strand center
To flowing；On the other hand, squeezing action produced by slighter compress can also promote the molten steel of solute in wick-containing along throwing side
To reverse flow, so that solute element is redistributed in molten steel, so that the solidified structure of strand more even compact, reach and change
Kind center segregation and the purpose reducing center porosity.
Soft reduction control technology has two crucial controlled quentity controlled variables, and one is depressing position, that is, along steel stream casting direction, finds
Suitable solidification end is implementing slighter compress；Another is exactly drafts, the thickness change after that is, strand containing wick-containing is squeezed
Amount.The drafts of billet caster controls to be implemented by withdrawal straightening machine, and Fig. 1 is that typical billet caster withdrawal straightening machine configuration is illustrated
Figure, every withdrawal straightening machine of in figure is made up of a pair of up-down rollers, and wherein lower roll is fixed bearing roller, roller can only passively rotate it is impossible to
Lifting；Upper roller is lifting driven roller, and by Motor drive, the lifting of upper roller is by the hydraulic cylinder being connected with upper roller roll stand for the rotation of upper roller
To control, every hydraulic cylinder all to carry displacement detecting sensor, for detecting the displacement of hydraulic cylinder piston rod, due to hydraulic cylinder
Piston rod and upper roller are to be mechanically connected, and the change in displacement of upper roller therefore can be detected by displacement detector；Due to lower roll lifting
Position is fixed, and therefore passes through the change in displacement of real-time detection upper roller, just can obtain the change of roll gap between withdrawal straightening machine up-down rollers in real time
Change.In billet caster slighter compress technique, the drafts of each pressure point is usually several millimeters, the essence therefore drafts being controlled
Degree requirement is very high, and due to the control controlling actually to tension leveler roller seam of drafts, therefore high-precision gap preset is determined
Determine the technology controlling and process effect of slighter compress.
In gap preset, the precision of tension leveler roller seam detection determines the precision of whole slighter compress process gap preset.
And the precision of roll gap detection is directly related with the roll gap calibration method of withdrawal straightening machine.Roll gap calibration be to displacement transducer detected value and
Departure between actual gap values between rollers is corrected and compensates.The same tension leveler roller seam of zero-bit due to upper roller oil cylinder displacement transducer
Zero-bit different it is therefore desirable to carry out the correction of roll gap detection limit by way of demarcating.Simultaneously as on each withdrawal straightening machine
Lower roll position, oil cylinder, displacement transducer assembling in difference different with gap, and use in roll surface wearing change not
With each withdrawal straightening machine cannot carry out the correction of roll gap detection limit with unified departure, needs every withdrawal straightening machine is marked respectively
Fixed, control system just can be made to obtain the accurate roll gap detection limit of every withdrawal straightening machine.
Existing tension leveler roller seam is demarcated and is mainly adopted dummy bar as calibration device, and uses single point pressure demarcation
Method, calibration process mainly includes：
1) select the chain link as standard thickness for some chain link of dummy bar, the thickness of this chain link has measured postscript in advance
For standard thickness Tstd, it is input to the benchmark as roll gap calibration in system；
2) dummy bar roller-way is transported in withdrawal straightening machine, the position of adjustment dummy bar, makes standard link be positioned to wait to mark
In the middle of fixed withdrawal straightening machine up-down rollers；
3), after the completion of positioning, start the demarcation of this withdrawal straightening machine, withdrawal straightening machine press down system is according to roll gap mark set in advance
Constant-pressure Ps(Baosteel large square bland continuous-casting machine is set as Ps=10 tons), depress the upper roller of this withdrawal straightening machine；
4) after the upper roller of withdrawal straightening machine touches the upper surface of dummy bar standard link, actual pressure PiaReach demarcation pressure
Power, the upper roller oil cylinder displacement transducer original detected value T of now system reading0, and calculate T0With standard thickness TstdBetween
Deviation delta T：Δ T=T0- Tstd；This deviation preserves in systems as the compensation dosage that No. i-th tension leveler roller seam detects；
5) after determining compensation dosage, by T1=T0- Δ T, the actual roll gap detection limit T to this withdrawal straightening machine1It is corrected
Compensate, make roll gap detection limit consistent with true roll gap size；
6) the 2nd is repeated to the other withdrawal straightening machines of same flow)～5) process of step, complete entirely to flow the roll gap of all withdrawal straightening machines
Calibration process.
There is following problem in existing roll gap calibration method:
1) nominal time is long, and efficiency is low.
Billet caster is all as calibration device at present using dummy bar, and the thickness due to constituting each chain link of dummy bar exists
Little bit different, therefore, is required for every time being demarcated with predetermined standard link, is so accomplished by every withdrawal straightening machine
When being demarcated, by starting rollgang, the standard link of dummy bar will be positioned in the up-down rollers of this withdrawal straightening machine
Between.The withdrawal straightening machine quantity of billet caster is general relatively many (, often stream has 9 withdrawal straightening machines taking Baosteel large square bland continuous-casting machine as a example),
Due to the chain link of only one section standard thickness on dummy bar, if demarcating to multiple stage withdrawal straightening machine, need under every withdrawal straightening machine
Carry out manually adjusting positioning, and be required for when every withdrawal straightening machine is demarcated waiting upper roller to decline to complete the pressure of same link surface again
Connect, the operation therefore many withdrawal straightening machines demarcated, need at least two operator to cooperate and just can complete, calibration process consumes
Duration, efficiency is low.
2) calibrated error is big, and precision is low.
Existing scaling method uses single point pressure and demarcates, and set upper roller depressing force ratio during demarcation is relatively low, roll gap
Detected value is to complete to correct under this low pressure and compensate.But in actual production, different depressing positions and difference are depressed
The depressing force that the withdrawal straightening machine of amount is used in slighter compress is different, and, its excursion can taking Baosteel large square bland continuous-casting machine as a example
With between 20～140 tons；Be found by experiment that, withdrawal straightening machine due to the elastic deformation of mechanical component and gap crowding-out effect,
After carrying out low pressure demarcation, can there is obvious deviation, with Baosteel bloom in same calibration device roll gap detection limit under high pressure
As a example conticaster, the roll gap calibration precision maximum under high pressure and low pressure can reach 2mm, and this deviation is existing demarcation side
Method cannot detect and compensate, and for the slighter compress technique of only several millimeters of drafts, this is the error that can not ignore,
The slighter compress technological effect of high-grade steel grade can be directly influenced.
Through retrieving and inquiring about, the roll gap calibration method base of published billet continuous casting slighter compress withdrawal straightening machine both at home and abroad at present
Originally it is using dummy bar or roll gap measuring instrument equipment, wherein roll gap measuring instrument is difficult in the closely spaced multithread square billet of this stream
Use on conticaster.Additionally, published related invention also includes：
(1) a kind of control method of pulling-straightening roller gap under light pressure of bloom caster on-line proving, Application Number (patent)
CN200910011679.3, this invention is by the use of the work(realizing its on-line proving in the average thickness pouring strand as roll gap benchmark
Energy.However, because strand can have the uncertain deformation behavior such as contraction, bulge in the moving process in withdrawal straightening machine, therefore its
Stated accuracy it is difficult to ensure that.
(2) it is used for the roll gap calibrating system of billet continuous casting withdrawal straightening machine, Application Number (patent) CN201020684938.7, this is real
Provide a kind of roll gap calibrating system for billet continuous casting withdrawal straightening machine with new, this system is still the single mark using dummy bar
Quasi- chain link, as calibration device, standard link is easy to identification positioning using reflective surface.However, for how to shorten the nominal time and
Improve stated accuracy, this technical scheme lacks corresponding description.
Content of the invention
For improving the roll gap calibration precision of the withdrawal straightening machine of billet continuous casting slighter compress, reduce the nominal time, improve and demarcate efficiency,
The invention provides a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine, technical scheme is as follows：
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine, including
a：Choose multi-section type uniform thickness chain bar as calibration device, set reference-calibrating value, described reference-calibrating value includes demarcating
Pressure value and nominal thickness value；
b：Start calibration device and complete demarcation action, read and record actually detected value；
c：Deviation is calculated with actually detected value according to reference-calibrating value, is corrected according to deviation and compensates；
It is characterized in that：
In step a, described nominal pressure value is set as two values, and one is minimal pressure force value, and one is maximal pressure
Force value, two described nominal pressure values constitute a pressure range value,
In step c, described correction and compensate according to two point Linear Correction algorithms, by the line between pressure and thickness
Property functional relationship determine,
Described demarcation by calibration device is used as using multi-section type uniform thickness chain bar, using the thickness of multi-section type uniform thickness chain bar as
Nominal thickness value, is input to the benchmark as roll gap calibration in system, calibration device roller-way is transported in withdrawal straightening machine, makes demarcation
The center of each chain link of device is positioned between the up-down rollers of each withdrawal straightening machine and completes.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to the present invention it is characterised in that：Institute
Linear functional relation between the pressure stated and thickness is：T1=T0- [Δ T1+K1 (Pa-P1)],
Wherein, T0 represents the original detection limit of straightening Oil cylinder displacement transducer；
Δ T1 represents the deviation compensation amount generating on first pressure spot during demarcation；
K1 represents that two point pressures demarcate the buckling coefficient generating；
Pa represents actual withdrawal straightening machine depressing force；
P1 represents first nominal pressure,
T1 represents calibrated tension leveler roller seam detected value.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to the present invention it is characterised in that：?
Multiple nominal pressure points are set on described pressure range value, chooses the two nominal pressure points adjacent with actually detected value left and right
For participating in the nominal pressure value calculating.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to the present invention it is characterised in that：Institute
K1=(Δ T2- Δ T1)/(P2-P1) stating,
Described Δ T1=T0-1-Tstd,
Described Δ T2=T0-2-Tstd,
Wherein, described Tstd represents nominal thickness value,
Described P2 represents second nominal pressure,
Described T0-1 represents the actual (real) thickness detected value under P1 pressure,
Described T0-2 represents the actual (real) thickness detected value under P2 pressure.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to the present invention it is characterised in that：Institute
The joint number of the chain link stated is more than or equal to the number of units of withdrawal straightening machine.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to the present invention it is characterised in that：Institute
Pitch between each chain link stated is equal to the centre-to-centre spacing of adjacent two withdrawal straightening machines.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to the present invention it is characterised in that：Institute
The thickness of each chain link stated is equal to the thickness of strand.
It is an advantage of the invention that：
1. the roll gap calibration precision that can realize under very high stated accuracy, different pressures can reach 0.1mm；
2. can once complete calibration device in every positioning flowing under all withdrawal straightening machines, can start simultaneously often flow all straightenings
The roll gap calibration of machine, demarcates operating personnel and can be reduced to 1 people from least 2 people, greatly save the time of demarcation, improve mark
Determine efficiency.
3. gap preset precision can be improved, improve slighter compress control effect.
Brief description
Fig. 1 is the control method flow chart of the present invention；
Fig. 2 is that the more piece calibration device in the present invention demarcates schematic diagram；
Fig. 3 is the more piece chain rod-type calibration device schematic diagram in the present invention.
In figure, 1 is calibration device overall length L；2 is chain link thickness L1；3 is chain link pitch L2；4 is zip length L3.
Specific embodiment
Below, according to specification drawings and specific embodiments to one kind of the present invention in billet caster slighter compress straightening
The roll gap calibration method of machine is further described in detail.
As shown in Figure 1, 2, 3, the particular content of technical solution of the present invention is described as follows：
1. adopt multi-section type calibration device as roll gap benchmark when demarcating
A. adopt multi-section type uniform thickness chain bar as calibration device；The total length L of chain bar have to be larger than the area of every stream withdrawal straightening stands
Between span；Chain bar is made up of the chain link of more piece uniform thickness；The joint number of chain bar needs more than or equal to the number of units often flowing withdrawal straightening machine；Chain bar
Thickness L1 need in tension leveler roller seam detection range, preferably close to produce strand thickness, be conducive to reduce roll gap inspection
The nonlinearity erron surveyed；Pitch L2 of chain bar needs the centre-to-centre spacing with adjacent two withdrawal straightening machines consistent, so permissible in positioning
Ensure that the center of each chain link can be located between the up-down rollers of every withdrawal straightening machine, it is to avoid the up-down rollers of withdrawal straightening machine are clipped in chain link
Hinge area on, impact demarcate when roll gap benchmark accuracy；The material of chain link needs to ensure will not produce under nominal pressure
Deformation.
B. using the thickness demarcating chain bar as standard thickness Tstd, it is input to the benchmark as roll gap calibration in system；
2. calibration device roller-way is transported in withdrawal straightening machine, makes the center of each chain link of calibration device be positioned each straightening
Between the up-down rollers of machine；Thus disposably complete positioning work under all withdrawal straightening machines of same flow for the calibration device, eliminate
The time loss of resetting under multiple stage withdrawal straightening machine.
3., after the completion of calibration device positioning, multipoint pressure automatic Calibration process can be entered with one-shot multiple stage withdrawal straightening machine；
A. multiple nominal pressure points are set in advance in systems, nominal pressure point should set more than 2 points, minimum nominal pressure
Can be determined according to the minimum pressure that withdrawal straightening machine during gap preset is pressed onto on strand, highest nominal pressure can be according to roll gap control
The maximum pressure that when processed, withdrawal straightening machine is pressed onto on strand is determining；
B. demarcate after starting, withdrawal straightening machine upper roller declines, nominal pressure Ps=P1, and withdrawal straightening machine press down system is from minimum one
Nominal pressure point P1 starts, and controls the depressing force of withdrawal straightening machine upper roller；
C. when the actual pressure detecting meets：P1- Δ P≤Pa≤P1+ Δ P, and it is stably maintained at this scope
Afterwards, system calculates deviation delta T1 between displacement transducer original detected value T0-1 now and standard thickness Tstd automatically：
Δ T1=T0-1-Tstd；And Δ T1 is preserved in systems as compensation dosage 1；
D. then, nominal pressure Ps automatically switches to P2, and withdrawal straightening machine press down system selects the 2nd nominal pressure point P2, comes
Adjust the depressing force of withdrawal straightening machine upper roller；
E. when the actual pressure detecting meets：P2- Δ P≤Pa≤P2+ Δ P, wherein Δ P are the pressure oscillation allowing
Scope, and after being stably maintained at this scope, system calculates displacement transducer original detected value T0-2 now automatically
Deviation delta T2 and standard thickness Tstd between：Δ T2=T0-2-Tstd；And Δ T2 is saved in system as compensation dosage 2
In；
If f. nominal pressure point is more than 2, step d) and e) can be repeated, complete the compensation dosage of all nominal pressure points
Calculate；
G. finish when the compensation dosage of all nominal pressure points has all measured, system automatically begins to calculate buckling COEFFICIENT K.If
Demarcated using two point pressures, then K1=(Δ T2- Δ T1)/(P2-P1)；If using more than 2 points of pressure calibration, then may be used
Different buckling coefficients, K1=(Δ T2- Δ T1)/(P2-P1), K2=(Δ T3- are produced according to different pressures Concourse Division
Δ T2)/(P3-P2)；
The compensation dosage generating when h. being demarcated using multipoint pressure and buckling coefficient, complete original to different pressures lower sensor
The compensation of detection limit, makes the roll gap detected value of reality can obtain the knot consistent with the standard thickness of calibration device at various pressures
Really, thus the roll gap detection error under flat different pressures that disappears.
Demarcate according to two point pressures, calibrated tension leveler roller seam detected value can be determined with following formula：
T1=T0- [Δ T1+K1 (Pa-P1)],
The original detection limit of T0- straightening Oil cylinder displacement transducer；
The deviation compensation amount generating on first pressure spot when Δ T1- demarcates；
K1- two point pressure demarcates the buckling coefficient generating；
The currently practical withdrawal straightening machine depressing force of Pa-；
First nominal pressure of P1-；
According to pressure calibration point be more than 2 points, then calibrated tension leveler roller seam detected value may be calculated as：
If actual pressure is：P1≤Pa ＜ P2,
Then T1=T0- [Δ T1+K1 (Pa-P1)]；
If actual pressure is：P2≤Pa ＜ P3,
Then T1=T0- [Δ T2+K2 (Pa-P2)]；
By that analogy.
Specific embodiment：
Withdrawal straightening machine quantity：9, withdrawal straightening machine spacing：1.1m
(1) adopt more piece chain-bar type calibration device
Calibration device chain bar joint number：9 sections；
Calibration device chain bar total length：10.3m
Calibration device chain bar thickness：320mm；
Calibration device chain bar pitch：1.1m；
Calibration device chain bar material：40GrMo4；
The standard thickness T of systemic presuppositionstd=320mm；
(2) calibration device roller-way is transported in withdrawal straightening machine, makes the center of each chain link of calibration device be positioned each and draw
Between the up-down rollers of strong machine；
(3), after the completion of calibration device positioning, 9 withdrawal straightening machines of one-shot enter multipoint pressure automatic Calibration process；
A) nominal pressure point：P1=10 tons, P2=110 tons；
B), after demarcation starts, withdrawal straightening machine upper roller declines, nominal pressure Ps=P1=10 tons, range of pressure fluctuations Δ P=1 ton；
C) as actual pressure PaStablize after 9～11 tons, roll gap original detected value T0-1=328mm, compensation dosage Δ T1=
T0-1- Tstd=328-320=8mm；
And then nominal pressure P d)s=P2=110 tons；
E) as actual pressure PaStablize after 109～111 tons, roll gap original detected value T0-2=326mm, compensation dosage Δ T2=
T0-2- Tstd=326-320=6mm；
F) calculate buckling COEFFICIENT K1=(Δ T2- Δ T1)/(P2- P1)=(6-8)/(110-10)=- 0.02；
G) calibrated tension leveler roller seam detected value is：
If withdrawal straightening machine depressing force：Pa=10 tons, now T0=328mm,
Then T1=T0- [Δ T1+K1(Pa- P1)]=328- [8+ (- 0.02) (10-10)]=320
If withdrawal straightening machine depressing force：Pa=60 tons, now T0=327mm,
Then T1=T0- [Δ T1+K1(Pa- P1)]=327- [8+ (- 0.02) (60-10)]=320
If withdrawal straightening machine depressing force：Pa=110 tons, now T0=326mm,
Then T1=T0- [Δ T1+K1(Pa- P1)]=326- [8+ (- 0.02) (110-10)]=320
So that the roll gap detected value under different pressures is consistent with actual true roll gap.
A kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine of the present invention, it is possible to achieve very high demarcation
Precision, the roll gap calibration precision under different pressures can reach 0.1mm；Calibration device can once be completed in all withdrawal straightening machines of every stream
Under positioning, the roll gap calibration often flowing all withdrawal straightening machines can be started, demarcating operating personnel can be reduced to from least 2 people simultaneously
1 people, greatlys save the time of demarcation, improves demarcation efficiency.Gap preset precision can be improved, improve slighter compress and control effect
Really.
Claims (7)
1. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine, including
a：Choose multi-section type uniform thickness chain bar as calibration device, set reference-calibrating value, described reference-calibrating value includes nominal pressure
Value and nominal thickness value；
b：Start calibration device and complete demarcation action, read and record actually detected value；
c：Deviation is calculated with actually detected value according to reference-calibrating value, is corrected according to deviation and compensates；
It is characterized in that：
In step a, described nominal pressure value is set as two values, and one is minimal pressure force value, and one is maximal pressure force value,
Two described nominal pressure values constitute a pressure range value,
In step c, described correction and compensate according to two point Linear Correction algorithms, by the linear letter between pressure and thickness
Number relation determines,
Described demarcation by calibration device is used as using multi-section type uniform thickness chain bar, using the thickness of multi-section type uniform thickness chain bar as demarcation
Thickness value, is input to the benchmark as roll gap calibration in system, calibration device roller-way is transported in withdrawal straightening machine, make calibration device each
The center of individual chain link is positioned between the up-down rollers of each withdrawal straightening machine and completes.
2. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to claim 1, its feature exists
In：Linear functional relation between described pressure and thickness is：T1=T0- [Δ T1+K1 (Pa-P1)],
Wherein, T0 represents the original detection limit of straightening Oil cylinder displacement transducer；
Δ T1 represents the deviation compensation amount generating on first pressure spot during demarcation；
K1 represents that two point pressures demarcate the buckling coefficient generating；
Pa represents actual withdrawal straightening machine depressing force；
P1 represents first nominal pressure；
T1 represents calibrated tension leveler roller seam detected value.
3. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to claim 1, its feature exists
In：Multiple nominal pressure points are set on described pressure range value, chooses two demarcation adjacent with actually detected value left and right
Pressure spot is the nominal pressure value participating in calculating.
4. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to claim 2, its feature exists
In：Described K1=(Δ T2- Δ T1)/(P2-P1),
Described Δ T1=T0-1-Tstd,
Described Δ T2=T0-2-Tstd,
Wherein, described Tstd represents nominal thickness value,
Described P2 represents second nominal pressure,
Described T0-1 represents the actual (real) thickness detected value under P1 pressure,
Described T0-2 represents the actual (real) thickness detected value under P2 pressure.
5. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to claim 1, its feature exists
In：The joint number of described chain link is more than or equal to the number of units of withdrawal straightening machine.
6. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to claim 1, its feature exists
In：Pitch between each described chain link is equal to the centre-to-centre spacing of adjacent two withdrawal straightening machines.
7. a kind of roll gap calibration method in billet caster slighter compress withdrawal straightening machine according to claim 1, its feature exists
In：The thickness of each described chain link is equal to the thickness of strand.
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| CN111112345B (en) * | 2019-12-25 | 2021-08-17 | 鞍钢集团自动化有限公司 | Control method for automatically compensating deviation generated by calibration of horizontal rolling mill |
| CN111331095B (en) * | 2020-03-09 | 2021-05-14 | 柳州钢铁股份有限公司 | Method for online sector section roll gap suspension calibration of slab caster |
| CN113084111B (en) * | 2021-03-25 | 2022-04-08 | 中天钢铁集团有限公司 | Method for correcting pressing precision of continuous casting withdrawal and straightening machine |
| CN114951578B (en) * | 2022-05-31 | 2023-07-14 | 北京高创智信冶金科技有限公司 | Light-pressing roll gap control method suitable for continuous casting square billets |
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| FR2606137B1 (en) * | 1986-10-30 | 1989-02-03 | Clecim Sa | METHOD AND DEVICE FOR VERIFYING THE ALIGNMENT OF THE ROLLERS OF A CONTINUOUS CASTING INSTALLATION |
| GB9824531D0 (en) * | 1998-11-10 | 1999-01-06 | Sarclad Int Ltd | Continuous casting apparatus |
| GB0623755D0 (en) * | 2006-11-28 | 2007-01-10 | Sarclad Ltd | Measuring system for continuous casting machines |
| CN102126006B (en) * | 2010-01-14 | 2013-01-02 | 宝山钢铁股份有限公司 | Roll gap control method for soft reduction technology for continuous casting |
| CN201900244U (en) * | 2010-12-28 | 2011-07-20 | 攀钢集团钢铁钒钛股份有限公司 | Roll gap calibrating system for square billet continuous casting withdrawing and straightening machine |
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