CN110343821A - A kind of control method preventing strip in overaging section wooden dipper song - Google Patents
A kind of control method preventing strip in overaging section wooden dipper song Download PDFInfo
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- CN110343821A CN110343821A CN201910643741.4A CN201910643741A CN110343821A CN 110343821 A CN110343821 A CN 110343821A CN 201910643741 A CN201910643741 A CN 201910643741A CN 110343821 A CN110343821 A CN 110343821A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention discloses a kind of control methods for preventing strip in overaging section wooden dipper song.For 0≤ε≤ts, first judge whether there is ε and make formulaIt sets up；If there is no ε formula is set up, to the speed of service v of strip in furnace1It is controlled such that v1=vmin+(vmax‑vmin)/k；If there is ε formula is set up, to the speed of service v of strip in furnace2It is controlled such that v2=vmax‑(vmax‑vmin)/k.It is controlled by the speed of service to strip in furnace, improve the speed of service of the strip in furnace, on the one hand the soaking time of strip is shortened, reduce the size of crystal grain, to improve the Critical Buckling stress of strip, the time of contact of strip and furnace roller is shortened, on the other hand so as to shorten the strip plasticity accumulation time, it effectively prevents strip in furnace and " wooden dipper is bent " occurs, improve the quality of strip.
Description
Technical field
The present invention relates to annealing technology field more particularly to a kind of control methods for preventing strip in overaging section wooden dipper song.
Background technique
Vertical annealing furnace is mainly by preheating section, bringing-up section, soaking zone, slow cooling section, rapid cooling section, overaging section and whole cold section of structure
It include: strip successively after preheating section, bringing-up section and soaking zone, temperature reaches needed for annealing at, technical process
The temperature wanted, then pass through slow cooling section and rapid cooling section strip is cooled to overaging needed for target temperature.Often due to tension,
The factors such as temperature, speed, furnace roller roll thermal crown will lead to strip extremely and transverse compression unstability occur in overaging section, and then lead to band
The defect that fold occurs in steel surface occurs.Such as 1420 continuous annealing of Shoudu Iron and Steel Co capital Tang is in 0.18*852mm specification on November 26th, 2011
Strip open in furnace heating and cause strip disconnected in overaging section wooden dipper song since the temperature difference of rapid cooling section and overaging section is up to 125 DEG C
Band, the curved looks of wooden dipper are as shown in Figure 1.
Summary of the invention
The present invention solves band in the prior art by providing a kind of control method for preventing strip in overaging section wooden dipper song
The technical problem of wooden dipper song occurs in overaging section for steel, realizes the technical effect for improving strip quality.
The present invention provides a kind of control methods for preventing strip in overaging section wooden dipper song, comprising:
For 0≤ε≤ts, judge whether there is ε and make formulaIt sets up；Wherein, ε is upper limit of integral, 0≤
ε≤ts；tsFor sampling time interval；T is the temperature of overaging section；T is the time of integration；
Make the formula if there is no εIt sets up, to the speed of service v of strip in furnace1Carrying out control makes
Obtain v1=vmin+(vmax-vmin)/k；Wherein, vmaxFor the highest running speed of strip in furnace；vminFor the minimum fortune of strip in furnace
Scanning frequency degree；K is the matching factor of strip speed in furnace；
Make the formula if there is εIt sets up, to the speed of service v of strip in furnace2Carrying out control makes
Obtain v2=vmax-(vmax-vmin)/k。
Further, make the formula if there is no εIt sets up, further includes:
The temperature difference T of rapid cooling section and overaging section to annealing furnace1It is controlled such that Δ T1=Trcs-Toas≤Tw；Its
In, TrcsFor the temperature of rapid cooling section exit strip；ToasThe temperature of strip is exported for overaging section；TwIt is annealing for different steel
The temperature difference that can bear in furnace.
Further, make the formula if there is εIt sets up, further includes:
The temperature difference T of rapid cooling section and overaging section to annealing furnace2It is controlled such that Δ T2=Trcs-Tzone≤Tw；Its
In, TzoneFor overaging section oven cavity atmosphere temperature.
Further, in the speed of service v to strip in furnace1After being controlled, further includes:
The surface quality of strip is monitored；
If monitoring result is that the belt steel surface wooden dipper song still occurs, the speed of service v of strip in furnace is improved1-newSo that
v1-new=v1+fv；Wherein, fvFor the velocity compensated value of strip in the furnace of setting.
Further, in the speed of service v for improving strip in furnace1-newDuring, it keeps in current annealing furnace
It is temperature-resistant.
Further, in the speed of service v to strip in furnace2After being controlled, further includes:
The surface quality of strip is monitored；
If monitoring result is that the belt steel surface wooden dipper song still occurs, the speed of service v of strip in furnace is improved2-newSo that
v2-new=v2+fv；Wherein, fvFor the velocity compensated value of strip in the furnace of setting.
Further, in the speed of service v for improving strip in furnace2-newDuring, to the current temperature in annealing furnace
Spend Ttube2-newIt is controlled such that Ttube2-new=Ttube+ftube；Wherein, TtubeIt is set for overaging section electric radiant tube tube temperature temperature
Definite value；ftubeFor the temperature compensation value of the overaging section of setting.
One or more technical solution provided in the present invention, has at least the following technical effects or advantages:
For 0≤ε≤ts, first judge whether there is ε and make formulaIt sets up；Make public affairs if there is no ε
Formula is set up, to the speed of service v of strip in furnace1It is controlled such that v1=vmin+(vmax-vmin)/k；Make formula if there is ε
It sets up, to the speed of service v of strip in furnace2It is controlled such that v2=vmax-(vmax-vmin)/k.Pass through the fortune to strip in furnace
Scanning frequency degree is controlled, and is improved the speed of service of the strip in furnace, is on the one hand shortened the soaking time of strip, reduce crystal grain
Size on the other hand shorten the time of contact of strip and furnace roller to improve the Critical Buckling stress of strip, to contract
The short strip plasticity accumulation time effectively prevents strip in furnace and " wooden dipper is bent " occurs, improves the quality of strip.
Detailed description of the invention
The curved looks of wooden dipper when Fig. 1 is the strip overaging section of 1420 continuous annealing 0.18*852mm specification of Shoudu Iron and Steel Co capital Tang；
Fig. 2 is the flow chart of the control method in overaging section wooden dipper song provided in an embodiment of the present invention that prevents strip；
Fig. 3 is 1420 continuous annealing overaging section wooden dipper song early warning program interface screenshot of Shoudu Iron and Steel Co capital Tang.
Specific embodiment
The embodiment of the present invention solves existing skill by providing a kind of control method for preventing strip in overaging section wooden dipper song
The technical problem of wooden dipper song occurs in overaging section for strip in art, realizes the technical effect for improving strip quality.
Technical solution in the embodiment of the present invention is to solve the above problems, general thought is as follows:
First judge the working of a furnace of overaging section when wooden dipper song occurs for strip, i.e. " hot stove chilling roller " or " black furnace hot-rolling "；Further according to sentencing
Break as a result, temperature difference control, speed adjustable strategies are formulated, to prevent very thin material bent in overaging section wooden dipper.Specifically, if it is " heat
The working of a furnace of furnace chilling roller " then reduces the temperature difference of rapid cooling section Yu overaging section, reduces the speed of service of strip.If it is " black furnace heat
The working of a furnace of roller " then increases the temperature difference of rapid cooling section Yu overaging section, improves the speed of service of strip.
Above-mentioned technical proposal in order to better understand, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Referring to fig. 2, the control method provided in an embodiment of the present invention for preventing strip in overaging section wooden dipper song, comprising:
For 0≤ε≤ts, judge whether there is ε and make formulaIt is whether true；Wherein, ε is upper limit of integral,
0≤ε≤ts, unit s；tsFor sampling time interval, 10-30min, unit s are taken；T is the temperature of overaging section, and unit is
℃；T is the time of integration, unit s；
Make formula if there is no εIt sets up, the working of a furnace of overaging section at this time is defined as to " hot stove is cold
Roller " then illustrates belt steel temperature height, and furnace roller temperature is low, to the speed of service v of strip in furnace1It is controlled such that v1=vmin+
(vmax-vmin)/k；Wherein, vmaxFor the highest running speed of strip in furnace, unit m/min, the heating efficiency with annealing furnace
It is related；vminFor the minimum operation speed of strip in furnace, unit m/min, with strip width, thickness, carbon equivalent, annealing temperature
It spends related；K be furnace in strip speed matching factor, dimensionless, value 2-15, with strip width, thickness, carbon equivalent, move back
Fiery temperature is related；
There is " wooden dipper is bent " defect in strip in order to prevent, makes formula if there is no εIt sets up, further includes:
The temperature difference T of rapid cooling section and overaging section to annealing furnace1It is controlled such that Δ T1=Trcs-Toas≤Tw；Its
In, TrcsFor the temperature of rapid cooling section exit strip, unit is DEG C；ToasThe temperature of strip is exported for overaging section, unit is DEG C；
TwIt is 10-300 DEG C, warm with strip width, thickness, carbon equivalent, annealing for the temperature difference that different steel can bear in annealing furnace
It spends related.
Specifically, by adjusting the revolving speed of rapid cooling section cooling blower to the rapid cooling section of annealing furnace and the temperature difference of overaging section
T1It is controlled, the specific steps are that: the actual temperature of current rapid cooling section and overaging section is obtained, if Trcs-Toas> k1·
Tw, then increase the revolving speed of the cooling blower of rapid cooling section until Trcs-Toas< k2·Tw.Wherein, k1Turn for the cooling blower of rapid cooling section
The increase regulation coefficient of speed, takes 1-1.1；k2For the reduction regulation coefficient of the cooling blower revolving speed of rapid cooling section, 0.9-0.99 is taken.
What needs to be explained here is that before the production of easy wooden dipper material, being needed with 1-3 volumes if it is the working of a furnace of " hot stove chilling roller "
Hot-rolling material carries out hot-rolling processing to the furnace roller of overaging section in such a way that low speed is run, until the temperature of each region strip of annealing furnace
Reach technique required value.Specifically, sufficiently furnace roller is preheated using the withdrawing roll material that low speed is run, to reduce the transverse direction of strip
The temperature difference reduces the temperature difference between overaging section and rapid cooling section by limitation rapid cooling section temperature, to reduce between strip and furnace roller
The temperature difference.
In order to further ensure that annealing after strip without wooden dipper song, the speed of service v of strip in furnace1It carries out controlling it
Afterwards, further includes:
The surface quality of strip is monitored；It specifically, can be by way of artificial observation or monitoring monitoring to band
The surface quality of steel is monitored.
If monitoring result is that belt steel surface wooden dipper song still occurs, the speed of service v of strip in furnace is improved1-newSo that
v1-new=v1+fv；Wherein, fvFor the velocity compensated value of strip in the furnace of setting, 10-20m/min is taken.
Overaging section electric radiant tube temperature is increased with the increase of speed in order to prevent, aggravates the transverse direction of strip and furnace roller
The temperature difference, in the speed of service v for improving strip in furnace1-newDuring, keep the temperature T in current annealing furnacetube-new-1It is constant,
That is Ttube-new-1=Ttube；Wherein, TtubeFor the preceding overaging section electric radiant tube tube temperature setting value that raises speed, unit is DEG C.
Make formula if there is εIt sets up, the working of a furnace of overaging section at this time is defined as " black furnace hot-rolling ",
Then illustrate that belt steel temperature is low, furnace roller temperature is high, produces easy wooden dipper material without withdrawing roll material, can directly be produced.To in furnace
The speed of service v of strip2It is controlled such that v2=vmax-(vmax-vmin)/k。
There is " wooden dipper is bent " defect in strip in order to prevent, makes formula if there is εIt sets up, further includes:
The temperature difference T of rapid cooling section and overaging section to annealing furnace2It is controlled such that Δ T2=Trcs-Tzone≤Tw；Its
In, TzoneFor overaging section oven cavity atmosphere temperature, unit is DEG C.
Specifically, by adjusting the revolving speed of rapid cooling section cooling blower to the rapid cooling section of annealing furnace and the temperature difference of overaging section
T2It is controlled.
In order to further ensure that annealing after strip without wooden dipper song, the speed of service v of strip in furnace2It carries out controlling it
Afterwards, further includes:
The surface quality of strip is monitored；It specifically, can be by way of artificial observation or monitoring monitoring to band
The surface quality of steel is monitored.
If monitoring result is that belt steel surface wooden dipper song still occurs, the speed of service v of strip in furnace is improved2-newSo that
v2-new=v2+fv；Wherein, fvFor the velocity compensated value of strip in the furnace of setting.
In order to control the temperature difference of strip and furnace roller, in the speed of service v for improving strip in furnace2-newDuring, to annealing
Current Temperatures T in furnacetube2-newIt is controlled such that Ttube2-new=Ttube+ftube；Wherein, TtubeFor overaging section electric radiation
Pipe tube temperature desired temperature, unit are DEG C；ftubeFor the temperature compensation value of the overaging section of setting, 0-20 DEG C is taken.
Typical accidents
1420 continuous annealing of Shoudu Iron and Steel Co capital Tang on November 26th, 2011 opened with the strip of 0.18*852mm specification in furnace heating due to
The temperature difference of rapid cooling section and overaging section causes strip in the disconnected band of overaging section wooden dipper song, furnace area parameter in 15:32 up to 125 DEG C
As shown in table 1.
1 Shoudu Iron and Steel Co capital Tang of table, 1420 area continuous annealing overaging section hot stove chilling roller Shi Lu parameter
Fig. 3 be the anti-wooden dipper song program interface screenshot of 1420 continuous annealing overaging section of Shoudu Iron and Steel Co capital Tang, by limit rapid cooling section strip steel with
The overaging section temperature difference, it is therefore prevented that lead to the generation of strip " wooden dipper is bent " defect because the working of a furnace is abnormal.
[technical effect]
1, for 0≤ε≤ts, first judge whether there is ε and make formulaIt sets up；Make if there is no ε
Formula is set up, to the speed of service v of strip in furnace1It is controlled such that v1=vmin+(vmax-vmin)/k；Make public affairs if there is ε
Formula is set up, to the speed of service v of strip in furnace2It is controlled such that v2=vmax-(vmax-vmin)/k.By to strip in furnace
The speed of service is controlled, and is improved the speed of service of the strip in furnace, is on the one hand shortened the soaking time of strip, reduce crystalline substance
On the other hand the size of grain shortens the time of contact of strip and furnace roller to improve the Critical Buckling stress of strip, thus
The strip plasticity accumulation time is shortened, strip in furnace is effectively prevented and " wooden dipper is bent " occurs, improve the quality of strip.
2, make formula if there is no εIt sets up, also the temperature to the rapid cooling section of annealing furnace and overaging section
Poor Δ T1It is controlled such that Δ T1=Trcs-Toas≤Tw, pass through the temperature difference T of rapid cooling section and overaging section to annealing furnace1Into
Row control, reduces belt steel temperature TrcsWith overaging section ToasThe temperature difference, to reduce thermal (temperature difference) stress suffered by strip, in turn
The lateral compression that strip is subject to is reduced, the generation of " wooden dipper is bent " defect is further avoided.
3, make formula if there is εIt sets up, also the temperature difference to the rapid cooling section of annealing furnace and overaging section
ΔT2It is controlled such that Δ T2=Trcs-Tzone≤Tw, reduce belt steel temperature TrcsWith overaging section oven cavity atmosphere TzoneTemperature
Difference further reduces thermal (temperature difference) stress suffered by strip, further reduces the lateral compression that strip is subject to, further
Avoid the generation of " wooden dipper is bent " defect.
4, in furnace strip speed of service v1After being controlled, also judge whether easy wooden dipper material wooden dipper still occurs
It is bent.If still there is wooden dipper song, the speed of service of strip in furnace is improved, and keep the temperature of current electric radiant tube consistent, thus
Wooden dipper song defect is further overcomed, strip quality is improved.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of control method for preventing strip in overaging section wooden dipper song characterized by comprising
For 0≤ε≤ts, judge whether there is ε and make formulaIt sets up；Wherein, ε is upper limit of integral, 0≤ε≤
ts；tsFor sampling time interval；T is the temperature of overaging section；T is the time of integration；
Make the formula if there is no εIt sets up, to the speed of service v of strip in furnace1It is controlled such that v1
=vmin+(vmax-vmin)/k；Wherein, vmaxFor the highest running speed of strip in furnace；vminFor the minimum operation speed of strip in furnace
Degree；K is the matching factor of strip speed in furnace；
Make the formula if there is εIt sets up, to the speed of service v of strip in furnace2It is controlled such that v2=
vmax-(vmax-vmin)/k。
2. the method as described in claim 1, which is characterized in that make the formula if there is no εIt sets up,
Further include:
The temperature difference T of rapid cooling section and overaging section to annealing furnace1It is controlled such that Δ T1=Trcs-Toas≤Tw；Wherein, Trcs
For the temperature of rapid cooling section exit strip；ToasThe temperature of strip is exported for overaging section；TwFor different steel in annealing furnace institute
The temperature difference that can be born.
3. the method as described in claim 1, which is characterized in that make the formula if there is εIt sets up, also
Include:
The temperature difference T of rapid cooling section and overaging section to annealing furnace2It is controlled such that Δ T2=Trcs-Tzone≤Tw；Wherein,
TzoneFor overaging section oven cavity atmosphere temperature.
4. the method as described in claim 1, which is characterized in that in the speed of service v to strip in furnace1It carries out controlling it
Afterwards, further includes:
The surface quality of strip is monitored；
If monitoring result is that the belt steel surface wooden dipper song still occurs, the speed of service v of strip in furnace is improved1-newSo that v1-new
=v1+fv；Wherein, fvFor the velocity compensated value of strip in the furnace of setting.
5. method as claimed in claim 4, which is characterized in that the speed of service v of strip in the raising furnace1-newProcess
In, keep temperature-resistant in current annealing furnace.
6. the method as described in claim 1, which is characterized in that in the speed of service v to strip in furnace2It carries out controlling it
Afterwards, further includes:
The surface quality of strip is monitored；
If monitoring result is that the belt steel surface wooden dipper song still occurs, the speed of service v of strip in furnace is improved2-newSo that v2-new
=v2+fv；Wherein, fvFor the velocity compensated value of strip in the furnace of setting.
7. method as claimed in claim 6, which is characterized in that the speed of service v of strip in the raising furnace2-newProcess
In, to the Current Temperatures T in annealing furnacetube2-newIt is controlled such that Ttube2-new=Ttube+ftube；Wherein, TtubeFor overaging
Section electric radiant tube tube temperature desired temperature；ftubeFor the temperature compensation value of the overaging section of setting.
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| CN114150141A (en) * | 2021-11-04 | 2022-03-08 | 本钢板材股份有限公司 | Method for controlling furnace roller convexity in overaging section |
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| CN109766593A (en) * | 2018-12-21 | 2019-05-17 | 首钢京唐钢铁联合有限责任公司 | A kind of appraisal procedure and device of strip wooden dipper style of song danger in furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150141A (en) * | 2021-11-04 | 2022-03-08 | 本钢板材股份有限公司 | Method for controlling furnace roller convexity in overaging section |
| CN114150141B (en) * | 2021-11-04 | 2023-11-17 | 本钢板材股份有限公司 | Control method for convexity of furnace roller in overaging section |
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