CN102266920B - Method for changing conical degree at moment of obstructing process of on-line width reduction of continuous casting crystallizer - Google Patents
Method for changing conical degree at moment of obstructing process of on-line width reduction of continuous casting crystallizer Download PDFInfo
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- CN102266920B CN102266920B CN 201110233062 CN201110233062A CN102266920B CN 102266920 B CN102266920 B CN 102266920B CN 201110233062 CN201110233062 CN 201110233062 CN 201110233062 A CN201110233062 A CN 201110233062A CN 102266920 B CN102266920 B CN 102266920B
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Abstract
The invention relates to a method for changing a conical degree at the moment of obstructing a process of on-line width reduction of a continuous casting crystallizer. The method comprises the following steps: taking solidifying contraction of a blank shell as a starting point, and then introducing a process obstructing condition in the process of reducing the width of the continuous casting crystallizer into the process of on-line width reduction at real time, so as to confirm a control parameter which contains an accelerated speed and a resetting time for adjusting a conical degree in the conical degree changing process of a casting machine, thereby reliably ensuring the safety continuous production of the casting machine. The method provided by the invention has significance on lowering the production cost, promoting the production quality, promoting the metal yield and promoting the market competitiveness of products.
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 affect slab quality and steel grade adaptability.For adapting to the requirement of continuous casting and rolling production frequent variations, crystallizer often need to be adjusted the strand that width obtains different size.In addition, for improving the operating rate of conticaster, also need to obtain uninterrupted production continuously of conticaster.For this reason, people develop the continuous need of production of the multiple rules strand of adaptation, shorten the continuous on-line width adjustment technology of crystallizer of producing time, reduction labour intensity, improving slab quality.But after causing continuous cast mold to adjust online the width stroke to be obstructed for the special operation condition that may occur, recover rapidly the initial tapering of casting machine, 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 the aspects such as raising operating rate all have extremely important effect.
Tradition on-line width adjustment technology transfers the urgency of wide speed to increase and anxious subtracting because crystallizer upper and lower opening speed difference causes transferring the instantaneous pressure variation effect that in wide process, hydraulic cylinder occurs, 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 coagulation base shell, easily safety in production is impacted.
Based on above-mentioned situation, be necessary to develop a kind of method that is applicable to continuously online tapering change when adjusting continuous cast mold width increase process and being obstructed, to adapt to the continuous need of production of multiple rules strand, shorten and produce time, reduce labour intensity, improve the quality of strand.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method that tapering change when adjusting online width and reduce process and be obstructed for continuous cast mold is provided.The method simple and feasible, after being obstructed for the wide process of the online hot accent of continuous casting production process, the tapering change provides approach easily, gives security thereby produce for the continuous casting safe and continuous.
The present invention solves its technical problem and adopts following technical scheme:
The method of tapering change when adjusting online width and reduce process and be obstructed for continuous cast mold provided by the invention, specifically: with base shell solidification shrinkage as starting point, the crystallizer width is reduced the operating mode of being obstructed of stroke in process import in real time online the adjustment in the process that width reduces, determine control parameter in 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 guarantee.
The method of described tapering change when adjusting online width and reduce process and be obstructed for continuous cast mold, its step comprises:
The first step, judge the interval of being obstructed:
At first, step wide according to current accent judged the interval of being obstructed, and confirms that crystallizer cone adjusting or the narrow limit translation width when delay process starts from width and reduces reduces process.Be obstructed if start from the crystallizer cone adjusting, carry out be obstructed tapering change of cone adjusting; Reduce process and be obstructed if start from mould at narrow translation width, 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 formula: a is tapering change acceleration; Vc is the strand casting speed; Tan θ transfers in 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:
The tapering change time is obstructed in cone adjusting can be definite by formula (2):
In formula: t is the tapering change time; L is the actual use height of crystallizer; Δ L/ is the tapering change amount when transferring wide being obstructed; Vc is the strand casting speed; Tan θ transfers in 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 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.
Therefore, 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 default different operating modes changes process, the essential characteristic of utilizing the natural shrinking amount 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 technique of traditional accent, the impact 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 wide process, the wearing and tearing of molten steel to narrow copper plate, also stablized simultaneously the solidification heat transfer process of molten steel in continuous cast mold.
When transferring wide process to be obstructed, import in real time in the process that the adjustment width increases online by the operating mode of being obstructed with this process, determine fast the control parameter in casting machine tapering change process, comprise that tapering is adjusted acceleration and the tapering adjustment is 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 the 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 guarantee, 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 actual production, be 6 mm at the one-sided tapering of crystallizer, casting speed 1.0 m/min, both sides transfer wide degree to reduce, in transferring wide process because the tapering cone adjusting causes one-sided top oil cylinder fault, this moment modulated cone 2 mm.In this process, need to adjust rapidly tapering and change the process that returns to normal production.In conventional procedure, when transferring wide fault to occur, often make stopping watering and process or to recover rapidly initial tapering than high acceleration, keep producing continuously.Stop watering to process and interrupted the default production schedule, continuous production is had a negative impact.And recover rapidly in initial tapering process, because tapering change acceleration is excessive, the translation that causes the solidified shell contraction change of initial solidification shell before going out crystallizer that meniscus begins to solidify not catch up with narrow copper plate changes, cause between solidified shell and mould at narrow copper coin effect of stress is arranged, high temperature coagulation base shell extruding copper plate of crystallizer, in the service life of reducing narrow face copper plate of crystallizer on the one hand, the normal freezing that affects on the other hand strand is shunk, and more is easy to cause continuous casting production hidden danger.
And by the wide process of the accent of setting in the method, will transfer wide process and process of billet withdrawal to mate, realize transferring wide process to conform to the solidification shrinkage of base shell.Occur in process in fault, actual condition is imported tapering change process, set the change cone process of the solidification shrinkage rate of change that meets the high temperature billet shell, namely become the cone acceleration and be 8.33 mm/min
2Make in transferring wide change cone process, the solidified shell that changes on the one hand has the support of mould at narrow copper coin, and the diabatic process of base shell is stable, be not subject to again simultaneously the extruding of copper coin, the unstressed base shell that causes is out of shape, and slows down solidified shell to the wearing and tearing of narrow copper plate, reduces continuous casting billet defective generation 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, this method simple and feasible, easy to operate.The present invention shrinks characteristics by considering casting blank solidification, and in the time of can realizing that continuous cast mold is adjusted online width and reduced process and be obstructed, the tapering change, be high efficiency continuous casting production, improve conticaster production capacity and efficient, and increasing recovery rate of iron all provides feasible method.
Description of drawings
Fig. 1 is in example 1, the time shifting relation of the crystallizer correspondence suitable for reading that obtains in tapering change process.
Fig. 2 is in example 2, the time shifting relation of the crystallizer correspondence suitable for reading that obtains in tapering change process.
The specific embodiment
The method of tapering change when adjusting online width and reduce process and be obstructed for continuous cast mold provided by the invention, specifically: with base shell solidification shrinkage as starting point, the crystallizer width is reduced the operating mode of being obstructed of stroke in process import in real time online the adjustment in the process that width reduces, determine control parameter in 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 guarantee.
The method of described tapering change when adjusting online width and reduce process and be obstructed for continuous cast mold, its step comprises:
The first step, judge the interval of being obstructed:
At first, step wide according to current accent judged the interval of being obstructed, and confirms that crystallizer cone adjusting or the narrow limit translation width when delay process starts from width and reduces reduces process.Be obstructed if start from the crystallizer cone adjusting, carry out be obstructed tapering change of cone adjusting; Reduce process and be obstructed if start from mould at narrow translation width, 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 formula: a is tapering change acceleration; Vc is the strand casting speed; Tan θ transfers in 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:
The tapering change time is obstructed in cone adjusting can be definite by formula (2):
In formula: t is the tapering change time; L is the actual use height of crystallizer; Δ L/ is the tapering change amount when transferring wide being obstructed; Vc is the strand casting speed; Tan θ transfers in 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 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:
Be 6 mm at the one-sided tapering of crystallizer, transferring wide process tapering variable is 6 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 cone 2 mm, obtained acceleration and tapering change time relationship in 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 in wide process, relevant parameter can be set to:
tanα=6/900， tanθ=(6-6)/900，V
c=1000 mm/min，
l=800 mm，
ΔL / =2 mm
Therefore:
1. tapering changes acceleration:
2. tapering changes process time:
The present embodiment 1 is in tapering change process, and the time shifting relation of the crystallizer correspondence suitable for reading that it obtains as shown in Figure 1.As shown in Figure 1: this process resets by the correction that once becomes cone process implementation tapering via trouble-free bottom oil cylinder.When fault occurs, actual condition is imported in tapering change process, obtaining tapering change acceleration is 8.33 mm/min
2, utilize this acceleration to act on rapidly the bottom oil cylinder, the cylinder action continuous and even variation.Changing to reach at tapering needs change amount one half (1 mm), and oil cylinder begins slow deceleration, until reach step change tapering process, realizes initial tapering change amount (2 mm).Action is completed, and continuous casting production is not stagnated.
Guarantee on the one hand in this process that crystallizer becomes the cone 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 damages.Realize to transfer on the other hand the continuous and even variation of wide process, use tool to have very important significance to the long service life of Width adjusting device.
In a word, tapering change process when this process is obstructed via the change of tapering repeatedly process implementation crystallizer width increase process is for during continuous casting produces, continuously, efficient, stable, safety in production provides necessary guarantee.
Embodiment 2:
Be 9 mm at the one-sided tapering of crystallizer, transferring wide process tapering change amount is 7.2 mm, casting speed 1.2 m/min, crystallizer height 900 mm, meniscus level 800 mm, owing to transferring wide translation to cause top oil cylinder fault, obtain acceleration and tapering change time relationship in corresponding tapering change process in transferring wide process.
As the above analysis, transfer wide procedure fault to appear at and transfer wide translation process.Transfer that in wide process, relevant parameter can be set to:
tanα=9/900， tanθ=(9-7.2)/900，V
c=1200 mm/min，
l=800 mm，
ΔL / =7.2 mm
Therefore:
1. tapering changes acceleration:
（3）
2. tapering changes process time:
The present embodiment 2 is in tapering change process, and the time shifting relation of the crystallizer correspondence suitable for reading that it obtains as shown in Figure 2.As shown in Figure 2: this process is via under the action of translation procedure fault, is resetted by the correction that once becomes cone process implementation tapering by trouble-free bottom oil cylinder.When fault occurs, actual condition is imported in tapering change process, obtaining tapering change acceleration is 14.4 mm/min
2, utilize this acceleration to act on rapidly the bottom oil cylinder, the cylinder action continuous and even variation.Changing to reach at tapering needs change amount one half (3.6 mm), and oil cylinder begins slow deceleration, until reach step change tapering process, realizes initial tapering change amount (7.2 mm).Action is completed, and continuous casting production is not stagnated.
Guarantee on the one hand in this process that crystallizer becomes the cone 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 damages.Realize to transfer on the other hand the continuous and even variation of wide process, use tool to have very important significance to the long service life of Width adjusting device.
In a word, tapering change process when this process is obstructed via the change of tapering repeatedly process implementation crystallizer width increase process is for during continuous casting produces, continuously, efficient, stable, safety in production provides necessary guarantee.
Claims (2)
1. the method for an online tapering change when adjusting the continuous cast mold width and reducing process and be obstructed, it is characterized in that with base shell solidification shrinkage as starting point, the crystallizer width is reduced the operating mode of being obstructed of stroke in process import in real time online the adjustment in the process that width reduces, determine control parameter in 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 guarantee;
When described crystallizer on-line width modulation process was obstructed, the control parameter of tapering change process was obtained by following method, and its step comprises:
The first step, judge the interval of being obstructed:
At first, step wide according to current accent judged the interval of being obstructed, and confirms that crystallizer cone adjusting or the narrow limit translation width when delay process starts from width and reduces reduces process; Be obstructed if start from the crystallizer cone adjusting, carry out be obstructed tapering change of cone adjusting; Reduce process and be obstructed if start from mould at narrow translation width, transfer the wide translation tapering change of being obstructed;
Second step, tapering change process acceleration:
Tapering change acceleration is determined by formula (1):
In formula: a is tapering change acceleration; Vc is the strand casting speed; Tan θ transfers in 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 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 transfers in 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;
Transfer wide translation tapering change time of being obstructed to be determined by formula (3)
In 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.
2. the purposes of the method for tapering change when online adjustment continuous cast mold width claimed in claim 1 reduces process and is obstructed, control parameter setting when it is characterized in that the method by the wide parameter of accent of setting and 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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| CN102601327B (en) * | 2012-03-23 | 2013-11-20 | 中冶南方工程技术有限公司 | Method for online adjusting width decrease of crystallizer continuously |
| CN102601328B (en) * | 2012-03-23 | 2013-11-20 | 中冶南方工程技术有限公司 | Multistep method for online adjusting width decrease of crystallizer rapidly |
| CN103480814B (en) * | 2013-09-03 | 2015-10-28 | 山西太钢不锈钢股份有限公司 | Wide method adjusted by a kind of chromium steel tail base |
| CN104785743A (en) * | 2014-01-22 | 2015-07-22 | 宝钢不锈钢有限公司 | Method for controlling ferritic stainless steel tail billet width |
| CN104148606B (en) * | 2014-08-14 | 2016-04-20 | 中冶南方工程技术有限公司 | On-line width adjustment method and device during a kind of continuous casting crystallizer for plate billet oil cylinder fault |
| CN106270436B (en) * | 2016-09-20 | 2018-06-29 | 中冶连铸技术工程有限责任公司 | A kind of method for improving the wide precision of crystallizer tune |
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| CN1559722A (en) * | 2004-03-01 | 2005-01-05 | 北京科技大学 | Technology of on-line control crystalizer narrow surface taper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1219448A (en) * | 1997-10-31 | 1999-06-16 | Sms舒路曼-斯玛公司 | Continuous casting crystallizer |
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Effective date of registration: 20201120 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. |