CN105945253B - Gap preset method after bleed-out occurs for a kind of slab caster - Google Patents
Gap preset method after bleed-out occurs for a kind of slab caster Download PDFInfo
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- CN105945253B CN105945253B CN201610560529.8A CN201610560529A CN105945253B CN 105945253 B CN105945253 B CN 105945253B CN 201610560529 A CN201610560529 A CN 201610560529A CN 105945253 B CN105945253 B CN 105945253B
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- bleed
- segment
- gap
- roll gap
- segment1
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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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
- B22D11/202—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by measuring temperature
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Abstract
The gap preset method after bleed-out occurs the invention discloses a kind of slab caster, including：S1 monitors continuous casting billet three-dimensional temperature field；S2, which obtains current time crystallizer meniscus, has the molten steel volume of mobility feature to the safe line position of conticaster, obtains the molten steel volume V in current time fan-shaped section with mobility featuresegment；S3 assumes VsegmentIncrease to Vsegment1, calculate Vsegment1Corresponding segment roll gap value and VsegmentVariable quantity between corresponding segment roll gap value；The variable quantity of segment roll gap value is then increased to V by S4 at once in the event of bleed-outsegment1Corresponding segment roll gap value；Otherwise S1 is turned.Present invention, avoiding the risk that during generation bleed-out, molten steel largely flows out at bleed-out, the plant equipment extent of damage is alleviated, reduces the intractability after bleed-out occurs.
Description
Technical field
The invention belongs to continuous casting technology field, is related to a kind of slab caster and the gap preset method after bleed-out occurs.
Background technology
In all kinds of accidents of continuous casting, damage that the most serious is bleed-out accident.Bleed-out refers to solidify in casting process
After green shell goes out crystallizer, green shell keeps out the effect of incessantly ferrostatic pressure and throwing power, and fracture occurs in weakness and makes molten steel
Outflow.Bleed-out can not only influence continuous casting, plant equipment is suffered damage, and increase maintenance capacity and maintenance cost, and can endanger
And personal safety.
With the development of technology, at present although the incidence of bleed-out accident is greatly reduced, but due to a variety of causes, still
Can inevitably it occur.When bleed-out occurs, experience is relied primarily at present to be handled, and closes submersed nozzle, fan
The roll gap of shape section is opened to maximum.
Above method processing is not prompt enough, and molten steel largely flows out at bleed-out, plant equipment is suffered damage, and has aggravated machine
The tool equipment extent of damage, the intractability after bleed-out occurs is added, and strand centre burst defect can be caused.
The content of the invention
In view of this, the gap preset method after bleed-out occurs it is an object of the invention to provide a kind of slab caster, should
Method is based on real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field, after bleed-out occurs, adjustment in real time
Segment roll gap value corresponding to molten steel with mobility feature.When avoiding generation bleed-out, molten steel largely flows out at bleed-out
Risk, alleviate the plant equipment extent of damage, reduce the intractability after bleed-out occurs, while pass through rational fan-shaped section
Gap preset, strand can be avoided to produce centre burst defect.
The purpose of the present invention is achieved through the following technical solutions, and the roll gap after bleed-out occurs for a kind of slab caster
Control method, comprise the following steps：
S1. real time and on line monitoring continuous casting billet three-dimensional temperature field Tfield；
S2. according to current continuous casting billet three-dimensional temperature field in real time, calculate and obtain current time crystallizer meniscus to continuous casting
The safe line position of machine has the molten steel volume V of mobility featuresafe, calculating to obtain in current time conticaster has remote adjustment
There is the molten steel volume V of mobility feature in the fan-shaped section of gap values between rollers abilitysegment；
S3. V is assumedsegmentIncrease to Vsegment1, calculate current time Vsegment1Corresponding segment roll gap value with
VsegmentVariable quantity △ Gap between corresponding segment roll gap valuebreakout, wherein Vsegment1=(Vsegment+Vsafe)；
S4. decline suddenly in the event of the excessive steel/mold liquid level of bleed-out/crystallizer, then at once by segment roll gap value
Variable quantity △ GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, until accident treatment is completed；Otherwise go to step
S1。
Further, in the step S1, real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three dimensional temperature is passed through
.
Further, the molten steel with mobility feature is relevant with the coefficient of fluidity δ for steel grade of casting.
Further, the safe line position of conticaster is relevant with the structure of conticaster.
Further, the variable quantity of segment roll gap value is adjusted by multiple fan-shaped sections, by the variable quantity △ of segment roll gap value
GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, multiple fan-shaped sections synchronously perform.
Further, step S1~S4 controlling cycles are less than 10 seconds.
By adopting the above-described technical solution, the present invention has the advantage that：
Present invention, avoiding the risk that during generation bleed-out, molten steel largely flows out at bleed-out, alleviate plant equipment and be damaged
Degree, the intractability after bleed-out occurs is reduced, while controlled by rational segment roll gap, can avoided in strand generation
Heart crack defect.
Brief description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
The detailed description of one step, wherein：
Fig. 1 is conticaster schematic diagram；
Fig. 2 is real-time on-line simulation casting stream temperature field schematic diagram；
Fig. 3 is real-time on-line simulation cross section temperature field schematic diagram.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；It should be appreciated that preferred embodiment
Only for the explanation present invention, the protection domain being not intended to be limiting of the invention.
Wherein zero section is vertical curve section, and 1~6 section is segmental arc, and 7~8 sections are straightening section, and 9~14 sections are horizontal segment, 1
~14 be all long-range gap preset fan-shaped section.
Gap preset method after bleed-out occurs for a kind of slab caster, comprises the following steps：
S1. real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field T is passed throughfield；
S2. according to current continuous casting billet three-dimensional temperature field in real time, calculate and obtain current time crystallizer meniscus to continuous casting
The safe line position of machine has the molten steel volume V of mobility featuresafe, calculating to obtain in current time conticaster has remote adjustment
There is the molten steel volume V of mobility feature in the fan-shaped section of gap values between rollers abilitysegment；Molten steel and casting with mobility feature
The coefficient of fluidity δ of steel grade is relevant, and the safe line position of conticaster is relevant with the structure of conticaster.
S3. V is assumedsegmentIncrease to Vsegment1, calculate current time Vsegment1Corresponding segment roll gap value with
VsegmentVariable quantity △ Gap between corresponding segment roll gap valuebreakout, wherein Vsegment1=(Vsegment+Vsafe)；
S4. decline suddenly in the event of the excessive steel/mold liquid level of bleed-out/crystallizer, then at once by segment roll gap value
Variable quantity △ GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, until accident treatment is completed；Otherwise go to step
S1。
In the present invention, the variable quantity of segment roll gap value is adjusted by multiple fan-shaped sections, by the change of segment roll gap value
Measure △ GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, multiple fan-shaped sections synchronously perform.
Step S1~S4 controlling cycles should be less than 10 seconds.
The present invention is not only suitable for the gap preset after bleed-out, be also adapted to crystallizer overflow steel and mold liquid level it is unexpected under
Drop.
Embodiment 1
Certain steel mill uses straight circular-arc type continuous casting machine to produce section as 250mm × 1870mm strands, and production steel grade is X, and pulling rate is
0.95m/min, cast temperature are 1539 DEG C, wherein zero section is vertical curve section, 1~6 section is segmental arc, and 7~8 sections are aligning
Section, 9~14 sections are horizontal segment, and 1~14 is all long-range gap preset fan-shaped section.
Comprise the following steps that：
1) in casting machine production process, Three-Dimensional Simulation of Temperature Fields model real-time tracking casting machine three-dimensional temperature field is passed through；
2) away from crystallizer meniscus 1.1m, the coefficient of fluidity δ for steel grade of casting takes the safe line position of the conticaster in this example
0.94 (meets TStrand>=δ TliqFor the molten steel with mobility feature, wherein TStrandFor the temperature of strand position, TliqFor
The liquidus temperature of casting steel grade).According to current real-time three-dimensional temperature field, calculate and obtain current time crystallizer meniscus extremely
The safe line position of conticaster has the molten steel volume V of mobility featuresafe=0.41939304m3, calculate obtain current time connect
Molten steel volume V with mobility feature in fan-shaped section with remote adjustment gap values between rollers ability in casting machinesegment=
1.468335193m3；
3) V is assumedsegmentIncrease to (Vsegment+Vsafe) when, calculate current time VsegmentCorresponding fan-shaped section roll
The variable quantity △ Gap of seam valuebreakout：△ SegmentIn01=0.481, △ SegmentOut01=0.362；
△ SegmentIn02=0.343, △ SegmentOut02=0.244；△ SegmentIn03=0.229,
Δ SegmentOut03=0.143；Δ SegmentIn04=0.130, Δ SegmentOut04=0.055；
Δ SegmentIn05=0.044, Δ SegmentOut05=0.009, Segment06~Segment14 roll gap become
Change amount is zero.
4) in the event of bleed-out, then at once by the variation delta of the current time segment roll gap value calculated in step 3)
GapbreakoutIncrease to (Vsegment+Vsafe) corresponding to segment roll gap value on until accident treatment complete；Otherwise go to step
1)。
In production process, contrast does not have the scene and slab quality using this method processing bleed-out accident, finds to adopt
After this method, molten steel only a small amount of outflow at bleed-out, greatly alleviate to the plant equipment extent of damage, reduce hair
Intractability after raw bleed-out, low power analysis is carried out by sampling and to strand, the strand contrasted without this method used tries
Sample, the strand centre burst defect for finding to employ this method disappear.
The present invention, without particular/special requirement, can be used for the various steel grades of each factory's production at present to the steel grade produced.
The present invention to conticaster pulling rate without particular/special requirement, suitable for various pulling rates.
The present invention is applied to all slab caster types in addition to horizontal type continuous casting machine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, it is clear that those skilled in the art
Member can carry out various changes and modification without departing from the spirit and scope of the present invention to the present invention.So, if the present invention
These modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to include these
Including change and modification.
Claims (6)
1. the gap preset method after bleed-out occurs for a kind of slab caster, it is characterised in that：Comprise the following steps：
S1. real time and on line monitoring continuous casting billet three-dimensional temperature field Tfield；
S2. according to current continuous casting billet three-dimensional temperature field in real time, calculate acquisition current time crystallizer meniscus to conticaster and pacify
Full line position has the molten steel volume V of mobility featuresafe, calculating to obtain in current time conticaster has remote adjustment roll gap
There is the molten steel volume V of mobility feature in the fan-shaped section of value abilitysegment；
S3. V is assumedsegmentIncrease to Vsegment1, calculate current time Vsegment1Corresponding segment roll gap value with
VsegmentVariable quantity △ Gap between corresponding segment roll gap valuebreakout, wherein Vsegment1=(Vsegment+Vsafe)；
S4. decline suddenly in the event of the excessive steel/mold liquid level of bleed-out/crystallizer, then at once by the change of segment roll gap value
Measure △ GapbreakoutIncrease to Vsegment1Corresponding segment roll gap value, until accident treatment is completed；Otherwise S1 is gone to step.
2. the gap preset method after bleed-out occurs for a kind of slab caster according to claim 1, it is characterised in that：Institute
State in step S1, pass through real-time on-line simulation three-dimensional temperature field Model Monitoring continuous casting billet three-dimensional temperature field.
3. the gap preset method after bleed-out occurs for a kind of slab caster according to claim 1, it is characterised in that：Tool
There is the molten steel of mobility feature relevant with the coefficient of fluidity δ for steel grade of casting.
4. the gap preset method after bleed-out occurs for a kind of slab caster according to claim 1, it is characterised in that：Even
The safe line position of casting machine is relevant with the structure of conticaster.
5. the gap preset method after bleed-out occurs for a kind of slab caster according to claim 1, it is characterised in that：Fan
The variable quantity of shape section gap values between rollers is adjusted by multiple fan-shaped sections, by the variable quantity △ Gap of segment roll gap valuebreakoutIncrease to
Vsegment1Corresponding segment roll gap value, multiple fan-shaped sections synchronously perform.
6. the gap preset method after bleed-out occurs for a kind of slab caster according to claim 1, it is characterised in that：Step
Rapid S1~S4 controlling cycles are less than 10 seconds.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107008874B (en) * | 2017-03-29 | 2018-11-27 | 东北大学 | A kind of continuous casting billet solidifying end pressing control method during unsteady statecalculation |
| CN107008877B (en) * | 2017-04-25 | 2019-03-26 | 中冶赛迪工程技术股份有限公司 | A kind of control method improving continuous casting machine roll-gap precision |
| 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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| JPH09122845A (en) * | 1995-11-07 | 1997-05-13 | Sumitomo Metal Ind Ltd | Method for completing casting in continuous casting |
| CN101130205A (en) * | 2006-08-23 | 2008-02-27 | 宝山钢铁股份有限公司 | On-line prognostication of thin strap continuous casting crackle and solidification organization, and control method thereof |
| CN101362196A (en) * | 2008-09-12 | 2009-02-11 | 攀钢集团研究院有限公司 | Control method of natural roll-gap thermal-contraction technique based on bloom |
| CN101934353A (en) * | 2009-06-30 | 2011-01-05 | 上海宝信软件股份有限公司 | Device and method for breakout prediction during slab continuous casting |
| CN105057625A (en) * | 2015-08-12 | 2015-11-18 | 河北钢铁股份有限公司邯郸分公司 | Adjusting method of slab caster roll gap under unsteady state pouring condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0818962B1 (en) * | 2007-11-19 | 2017-07-04 | Posco | CONTINUOUS INJECTION PLATE AND METHOD FOR MANUFACTURING THE SAME |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09122845A (en) * | 1995-11-07 | 1997-05-13 | Sumitomo Metal Ind Ltd | Method for completing casting in continuous casting |
| CN101130205A (en) * | 2006-08-23 | 2008-02-27 | 宝山钢铁股份有限公司 | On-line prognostication of thin strap continuous casting crackle and solidification organization, and control method thereof |
| CN101362196A (en) * | 2008-09-12 | 2009-02-11 | 攀钢集团研究院有限公司 | Control method of natural roll-gap thermal-contraction technique based on bloom |
| CN101934353A (en) * | 2009-06-30 | 2011-01-05 | 上海宝信软件股份有限公司 | Device and method for breakout prediction during slab continuous casting |
| CN105057625A (en) * | 2015-08-12 | 2015-11-18 | 河北钢铁股份有限公司邯郸分公司 | Adjusting method of slab caster roll gap under unsteady state pouring condition |
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