CN102266921A - Method for regulating conicity change under resistance to widening of continuous casting crystallizer on line - Google Patents
Method for regulating conicity change under resistance to widening of continuous casting crystallizer on line Download PDFInfo
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- CN102266921A CN102266921A CN201110233077XA CN201110233077A CN102266921A CN 102266921 A CN102266921 A CN 102266921A CN 201110233077X A CN201110233077X A CN 201110233077XA CN 201110233077 A CN201110233077 A CN 201110233077A CN 102266921 A CN102266921 A CN 102266921A
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Abstract
The invention provides a method for regulating conicity change under resistance to widening of continuous casting crystallizer on line. The method comprises a step of introducing a stroke obstruction working condition during width increase of the crystallizer into an online adjustment width increase process by taking solidification and contraction of a solidified shell as a starting point so as to determine control parameters of a conical degree change process of a casting machine, namely a conical degree adjustment acceleration and a conical degree adjustment resetting time, so that reliable guarantee is provided for secure and continuous production of the casting machine. The method has great significance for reduction of the production cast, improvement of the production quality, increase of the metal yield and enhancement of the market competitive power.
Description
Technical field
Tapering change process when the online hot adjustment width increase process of the online tapering change of continuous cast mold technical field, especially continuous cast mold that the present invention relates to is obstructed.
Background technology
Continuous cast mold is the heart of continuous casting, can directly influence slab quality and steel grade adaptability.For adapting to the requirement of continuous casting and rolling production frequent variations, crystallizer often need be adjusted the strand that width obtains different size.In addition, for improving the operating rate of conticaster, also need to obtain the uninterrupted continuously of conticaster and produce.For this reason, people develop adapt to multiple rules strand produce needs continuously, shorten produce time, reduce labour intensity, the continuous on-line width adjustment technology of crystallizer of raising slab quality.But after causing the online adjustment width of continuous cast mold stroke to be obstructed for the special operation condition that may occur, recover the initial tapering of casting machine rapidly, realize that the technology of safety in production just seems more important.Real-time online tapering change technology is kept the safety in production for continuous casting, reduces production accident, and aspects such as raising operating rate all have important role.
Tradition on-line width adjustment technology is because crystallizer upper and lower opening speed difference causes transferring the instantaneous pressure variation effect that hydraulic cylinder occurs in the wide process to transfer the urgency of wide speed to increase and anxious subtracting, and it is unfavorable that equipment is used; In addition, there is adverse effect in this process of billet withdrawal and continuously normal diabatic process of also exchanging wide process high temperature solidified shell, easily safety in production is impacted.
Based on above-mentioned situation, be necessary to develop a kind of method that is applicable to tapering change when continuous online adjustment continuous cast mold width increase process is obstructed, produce needs continuously, shorten and produce time to adapt to multiple rules strand, reduce labour intensity, improve the quality of strand.
Summary of the invention
Technical problem to be solved by this invention is: the method that a kind of tapering change when being used for continuous cast mold on-line width adjustment width increase process and being obstructed is provided.This method simple and feasible, for after being used for the wide process of the online hot accent of continuous casting production process and being obstructed, the tapering change provides fast way, thereby gives security for the production of continuous casting safe and continuous.
The present invention solves its technical problem and adopts following technical scheme:
The method of tapering change when being used for continuous cast mold online adjustment width increase process and being obstructed provided by the invention, specifically: with base shell solidification shrinkage as starting point, the operating mode of being obstructed of stroke in the crystallizer width increase process is imported in real time in the process that online adjustment width increases, determine control parameter in the casting machine tapering change process with this, for the safe and continuous production of casting machine provides reliable assurance.
The method of described tapering change when being used for continuous cast mold online adjustment width increase process and being obstructed, its step comprises:
The first step, judge the interval of being obstructed:
At first, judge the interval of being obstructed, confirm that the process of being obstructed starts from the crystallizer cone adjusting or narrow limit translation width increases process according to the wide step of current accent.Be obstructed if start from the crystallizer cone adjusting, then carry out be obstructed tapering change of cone adjusting; If start from mould at narrow translation width increase process and be obstructed, then transfer the wide translation tapering change of being obstructed;
Second step, tapering change process acceleration:
Tapering change acceleration can be determined by formula (1):
（1）
In the formula, a is a tapering change acceleration; Vc is the strand casting speed; Tan θ is for transferring in the wide process tapering default angle value after changing; Tan α is when transferring wide the beginning, the angle value of the initial tapering of crystallizer;
The 3rd step, tapering change process time:
The tapering change time is obstructed in cone adjusting can be definite by formula (2):
In the formula, t is the tapering change time; L is the actual use height of crystallizer; Δ L
/Tapering change amount when transferring wide being obstructed; Vc is the strand casting speed; Tan θ is for transferring in the wide process tapering default angle value after changing; Tan α is when transferring wide the beginning, the angle value of the initial tapering of crystallizer;
Transferring wide translation to be obstructed the tapering change time can be definite by formula (3)
In the formula, t is the tapering change time; L is the actual use height of crystallizer; H is the crystallizer height; Vc is the strand casting speed;
Change tapering acceleration and the change tapering time of the present invention by setting, just can know in detail that tapering changes each stage, carry out the online tapering change of continuous cast mold.
The present invention compared with prior art has following main beneficial effect:
This method simple and feasible, easy to operate.By considering that casting blank solidification shrinks characteristics, tapering corresponding under the default different operating modes changes process, the essential characteristic of utilizing the natural amount of contraction of high temperature billet shell in the process of setting of tapering change and molten steel to conform to, the process of billet withdrawal of high temperature billet shell is limited on the mould at narrow copper coin of adjustment all the time, successfully overcome in the wide technology of traditional accent, the influence that crystallizer upper and lower opening speed difference causes the transient change of hydraulic cylinder in the translation process that equipment is caused, slow down and transfer in the wide process, molten steel has also been stablized the solidification and heat transfer process of molten steel in the continuous cast mold simultaneously to the wearing and tearing of narrow copper plate.
When transferring wide process to be obstructed, import in real time in the process of online adjustment width increase by the operating mode of being obstructed this process, determine the control parameter in the casting machine tapering change process fast, comprise that tapering is adjusted acceleration and tapering is adjusted required consuming time.When transferring wide process to be obstructed, set continuous, the stable course of action of normal hydraulic cylinder, when having solved the crystallizer on-line width modulation process and being obstructed, the potential threat that safety in production brings to continuous casting is for the safe and continuous production of casting machine provides reliable assurance.Therefore, when this method can realize that continuous cast mold on-line width adjustment width process is obstructed tapering continuously, stable change, for high efficiency continuous casting provides basic assurance, to reducing production costs, improve the quality of production, increase recovery rate of iron, improve the competitiveness of product in market and all have very important meaning.
For example: in the actual production, be 4.5 mm at the one-sided tapering of crystallizer, casting speed 1.0 m/min, both sides transfer wide degree to increase, and cause one-sided top oil cylinder fault owing to the tapering cone adjusting in transferring wide process, at this moment modulated awl 1.5 mm.In this process, need to adjust tapering rapidly and change the process that returns to normal production.In the conventional procedure, when transferring wide fault to occur, often make and stop watering processing or, keep production continuously to recover initial tapering rapidly than high acceleration.Stop watering to handle and interrupted the default production schedule, continuous production is had a negative impact.And recover rapidly in the initial tapering process, because tapering change acceleration is excessive, the translation that the solidified shell contraction change of initial solidification shell before going out crystallizer that causes meniscus to begin to solidify do not catch up with narrow copper plate changes, cause between solidified shell and the mould at narrow copper coin stress effect is arranged, high temperature solidified shell extruding copper plate of crystallizer, on the one hand the service life of reducing the crystallizer narrow copper plate, the normal freezing that influences strand is on the other hand shunk, and is easy to cause continuous casting production hidden danger more.
And, will transfer wide process and process of billet withdrawal to mate by the wide process of the accent of setting in this method, realize transferring wide process to conform to the solidification shrinkage of base shell.Occur in the process in fault, actual condition is imported tapering change process, set the change awl process of the solidification shrinkage rate of change that meets the high temperature billet shell, promptly become the awl acceleration and be 6.25 mm/min
2Make in transferring wide change awl process, the solidified shell that changes has the support of mould at narrow copper coin on the one hand, is not subjected to the extruding of copper coin simultaneously again, and the unstressed base shell that causes is out of shape, slow down the wearing and tearing of solidified shell to narrow copper plate, reduce the continuous casting billet defective and generate probability, on the other hand, utilize the alternating movement simultaneously of cone adjusting process crystallizer upper and lower opening, the hydraulic cylinder travel continuous and even variation is very favourable to the equipment direct motion.
To sum up, the present invention improves the quality of production to reducing production costs, and improves recovery rate of iron, improves the competitiveness of product in market and has very important meaning.
Description of drawings
Fig. 1 is in example 1, the crystallizer that obtains in tapering change process time corresponding displacement relation suitable for reading.
Fig. 2 is in example 2, the crystallizer that obtains in tapering change process time corresponding displacement relation suitable for reading.
The specific embodiment
The method of tapering change when being used for continuous cast mold online adjustment width increase process and being obstructed provided by the invention, specifically: with base shell solidification shrinkage as starting point, the operating mode of being obstructed of stroke in the crystallizer width increase process is imported in real time in the process that online adjustment width increases, determine control parameter in the casting machine tapering change process with this, for the safe and continuous production of casting machine provides reliable assurance.
The method of described tapering change when being used for continuous cast mold online adjustment width increase process and being obstructed, its step comprises:
The first step, judge the interval of being obstructed:
At first, judge the interval of being obstructed, confirm that the process of being obstructed starts from the crystallizer cone adjusting or narrow limit translation width increases process according to the wide step of current accent.Be obstructed if start from the crystallizer cone adjusting, then carry out be obstructed tapering change of cone adjusting; If start from mould at narrow translation width increase process and be obstructed, then transfer the wide translation tapering change of being obstructed;
Second step, tapering change process acceleration:
Tapering change acceleration can be determined by formula (1):
In the formula, a is a tapering change acceleration; Vc is the strand casting speed; Tan θ is for transferring in the wide process tapering default angle value after changing; Tan α is when transferring wide the beginning, the angle value of the initial tapering of crystallizer;
The 3rd step, tapering change process time:
The tapering change time is obstructed in cone adjusting can be definite by formula (2):
In the formula, t is the tapering change time; L is the actual use height of crystallizer; Δ L
/Tapering change amount when transferring wide being obstructed; Vc is the strand casting speed; Tan θ is for transferring in the wide process tapering default angle value after changing; Tan α is when transferring wide the beginning, the angle value of the initial tapering of crystallizer;
Transferring wide translation to be obstructed the tapering change time can be definite by formula (3)
In the formula, t is the tapering change time; L is the actual use height of crystallizer; H is the crystallizer height; Vc is the strand casting speed;
Change tapering acceleration and the change tapering time of the present invention by setting, just can know in detail that tapering changes each stage, carry out the online tapering change of continuous cast mold.
Below in conjunction with specific embodiments and the drawings the present invention is further elaborated, but does not limit the present invention.
Embodiment 1:
At the one-sided tapering of continuous cast mold is 4.5 mm, transferring wide process tapering recruitment is 4.5 mm, casting speed 1.0 m/min, crystallizer height 900 mm, meniscus level 800 mm, because the tapering cone adjusting causes top oil cylinder fault, this moment, modulated awl 1.5 mm obtained acceleration and tapering change time relationship in the corresponding tapering change process in transferring wide process.
As the above analysis, transfer wide procedure fault to appear at the cone adjusting process.Transfer that relevant parameter can be set in the wide process:
tanα=4.5/900，?tanθ=(4.5+4.5)/900，V
c=1000?mm/min，
l=800?mm，
ΔL / =1.5?mm
Therefore:
1. tapering changes acceleration:
2. tapering changes process time:
（2）
Present embodiment 1 is in tapering change process, and its crystallizer that obtains time corresponding displacement relation suitable for reading as shown in Figure 1.As shown in Figure 1: this process resets by the correction that once becomes awl process realization tapering via trouble-free bottom oil cylinder.When fault occurs, actual condition is imported in the tapering change process, obtaining tapering change acceleration is 6.25 mm/min
2, utilize this acceleration to act on the bottom oil cylinder rapidly, the cylinder action continuous and even variation.Reach and need change measure a half (0.75 mm) in the tapering variation, oil cylinder begins slow deceleration, until reaching step change tapering process, realizes initial tapering change amount (1.5 mm).Action is finished, and continuous casting production is not stagnated.
Guarantee on the one hand in this process that crystallizer becomes the awl correction procedure and conforms to the casting blank solidification contraction, the base shell is not subjected to stress deformation, crystallizer is not produced extra accent wide-wheel grinding and decreases.Realize to transfer the continuous and even variation of wide process on the other hand, the longevity use tool of Width adjusting device is had very important significance.
In a word, tapering change process when this process realizes that via tapering change process repeatedly crystallizer width increase process is obstructed is for during continuous casting produces, continuously, efficient, stable, safety in production provides necessary guarantee.
Embodiment 2:
At the one-sided tapering of continuous cast mold is 9 mm, transferring wide process tapering recruitment is 9 mm, casting speed 0.8 m/min, crystallizer height 900 mm, meniscus level 800 mm, in transferring wide process,, obtain acceleration and tapering change time relationship in the corresponding tapering change process owing to transfer wide translation to cause top oil cylinder fault.
As the above analysis, transfer wide procedure fault to appear at and transfer wide translation process.Transfer that relevant parameter can be set in the wide process:
tanα=9/900，?tanθ=(9+9)/900，V
c=800?mm/min，
l=800?mm，
H=900?mm
Therefore:
1. tapering changes acceleration:
2. tapering changes process time:
（4）
Present embodiment 2 is in tapering change process, and its crystallizer that obtains time corresponding displacement relation suitable for reading as shown in Figure 2.As shown in Figure 2: this process resets by the correction that once becomes awl process realization tapering via trouble-free bottom oil cylinder.When fault occurs, actual condition is imported in the tapering change process, obtaining tapering change acceleration is 8 mm/min
2, utilize this acceleration to act on the bottom oil cylinder rapidly, the cylinder action continuous and even variation.Reach and need change measure a half (4.5 mm) in the tapering variation, oil cylinder begins slow deceleration, until reaching step change tapering process, realizes initial tapering change amount (9 mm).Action is finished, and continuous casting production is not stagnated.
Guarantee on the one hand in this process that crystallizer becomes the awl correction procedure and conforms to the casting blank solidification contraction, the base shell is not subjected to stress deformation, crystallizer is not produced extra accent wide-wheel grinding and decreases.Realize to transfer the continuous and even variation of wide process on the other hand, the longevity use tool of Width adjusting device is had very important significance.
In a word, tapering change process when this process realizes that via tapering change process repeatedly crystallizer width increase process is obstructed is for during continuous casting produces, continuously, efficient, stable, safety in production provides necessary guarantee.
Claims (3)
1. the method for tapering change when an online adjustment continuous cast mold width increase process is obstructed, it is characterized in that with base shell solidification shrinkage as starting point, the operating mode of being obstructed of stroke in the crystallizer width increase process is imported in real time in the process that online adjustment width increases, determine control parameter in the casting machine tapering change process with this: comprise that tapering is adjusted acceleration and resetting time is adjusted in cone adjusting, for the safe and continuous production of casting machine provides reliable assurance.
2. the method for tapering change when being used for continuous cast mold online adjustment width increase process and being obstructed according to claim 1, when it is characterized in that described crystallizer on-line width modulation process is obstructed, the control parameter of tapering change process is obtained by following method, and its step comprises:
The first step, judge the interval of being obstructed:
At first, judge the interval of being obstructed, confirm that the process of being obstructed starts from the crystallizer cone adjusting or narrow limit translation width increases process according to the wide step of current accent; Be obstructed if start from the crystallizer cone adjusting, then carry out be obstructed tapering change of cone adjusting; If start from mould at narrow translation width increase process and be obstructed, then transfer the wide translation tapering change of being obstructed;
Second step, tapering change process acceleration:
Tapering change acceleration is determined by formula (1):
In the formula: a is a tapering change acceleration; V
cBe the strand casting speed; Tan θ is for transferring in the wide process tapering default angle value after changing; Tan α is when transferring wide the beginning, the angle value of the initial tapering of crystallizer; L is the actual use height of crystallizer;
The 3rd step, tapering change process time:
Cone adjusting tapering change time of being obstructed is determined by formula (2):
In the formula: t is the tapering change time; L is the actual use height of crystallizer; Δ L
/Tapering change amount when transferring wide being obstructed; Vc is the strand casting speed; Tan θ is for transferring in the wide process tapering default angle value after changing; Tan α is when transferring wide the beginning, the angle value of the initial tapering of crystallizer;
Transferring wide translation to be obstructed the tapering change time can be definite by formula (3)
In the formula: t is the tapering change time; L is the actual use height of crystallizer; H is the crystallizer height; Vc is the strand casting speed.
3. arbitrary described purposes of the method for tapering change when being used for continuous cast mold online adjustment width increase process and being obstructed in the claim 1 to 2, it is characterized in that this method is by the wide parameter of accent set and the control parameter setting when transferring wide process to be obstructed, to know that tapering changes each stage, adjust the continuous cast mold tapering, reach the safety in production requirement.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601336A (en) * | 2012-03-23 | 2012-07-25 | 中冶南方工程技术有限公司 | Method for online adjusting width increase of crystallizer continuously |
| CN110947924A (en) * | 2018-09-27 | 2020-04-03 | 上海宝信软件股份有限公司 | On-line thermal width adjusting method suitable for crystallizer |
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| EP0611619A2 (en) * | 1993-02-16 | 1994-08-24 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Mould for the continuous casting of thin slabs |
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| JP3133549B2 (en) * | 1993-04-13 | 2001-02-13 | 住友重機械工業株式会社 | Oxide superconducting conductor |
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| JPH03133549A (en) * | 1989-10-19 | 1991-06-06 | Kawasaki Steel Corp | Method for changing width of cast slab at the time of continuous casting |
| EP0611619A2 (en) * | 1993-02-16 | 1994-08-24 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Mould for the continuous casting of thin slabs |
| US5472040A (en) * | 1993-03-22 | 1995-12-05 | Mannesmann Aktiengesselschaft | Continuous casting mold with adjustable width |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601336A (en) * | 2012-03-23 | 2012-07-25 | 中冶南方工程技术有限公司 | Method for online adjusting width increase of crystallizer continuously |
| CN102601336B (en) * | 2012-03-23 | 2013-11-20 | 中冶南方工程技术有限公司 | Method for online adjusting width increase of crystallizer continuously |
| CN110947924A (en) * | 2018-09-27 | 2020-04-03 | 上海宝信软件股份有限公司 | On-line thermal width adjusting method suitable for crystallizer |
| CN110947924B (en) * | 2018-09-27 | 2021-07-20 | 上海宝信软件股份有限公司 | On-line thermal width adjusting method suitable for crystallizer |
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Effective date of registration: 20201130 Address after: No.28 Shuguang Xili, Chaoyang District, Beijing 100028 Patentee after: China Metallurgical Industry Co., Ltd Address before: 430223. 33, University Road, East Lake New Technology Development Zone, Wuhan, Hubei Patentee before: China Metallurgical South Engineering Technology Co.,Ltd. |
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