CN102240787B - Method for increasing online adjusting width of continuous casting crystallizer within large range - Google Patents
Method for increasing online adjusting width of continuous casting crystallizer within large range Download PDFInfo
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Abstract
The invention relates to a method for increasing the online adjusting width of a continuous casting crystallizer within a large range, and the method the following steps of: importing a crystallizer width increasing process into an online width adjusting process while the characteristic that a blank shell is solidified and contracted at high temperature is considered, wherein the process is a width increasing process; and rapidly determining control parameters comprising a width adjusting speed, width adjusting time and length of a wedge-shaped segment in the width adjusting process. Thus, a continuous casting crystallizer online width adjusting operation is guided, a large-range online hot width adjusting process is realized, and the process is the width increasing process. In the invention, the requirement for adjusting the width of the crystallizer within the large range is taken as a starting point, the characteristic that the blank shell is solidified and contracted at high temperature is taken as a basis, and the action of a casting blank and the frictional force of a copper plate are reduced, thus the method provided by the invention is simple, easy and feasible, is convenient to operate and has distinctly important significance for reducing the production cost, improving the production quality, increasing the metal yield and improving the market competitive power of products.
Description
Technical field
The present invention relates to continuous cast mold on-line width adjustment technical field, especially relate to the process that the width of the online heat adjustment of continuous cast mold on a large scale reduces.
Background technology
Continuous cast mold is as the core component of conticaster, and its structure, performance directly affect the adaptability of slab quality and steel grade.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.Traditional conticaster is when change strand size, and the method for employing is to stop casting, manually adjusts the crystallizer width or realizes that by changing crystallizer width changes.Shut down secondary at conticaster and open under the situation of watering, influence steel mill's rhythm of production on the one hand, reduce strand output; Shut down to open to water on the other hand and also cause raw-material waste, increase production cost.In addition, traditional 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.
Based on above-mentioned situation, be necessary to develop a kind of new, can adapt to multiple rules strand and produce needs continuously, shorten and produce time, reduce labour intensity, improve slab quality, the continuous on-line width adjustment technology of crystallizer of raising service life of equipment.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method for the online adjustment width increase of continuous cast mold on a large scale is provided, this method simple and feasible, online hot accent wide (width increase) process provides fast way in order to produce on a large scale for continuous casting, thereby satisfies the requirement that the strand size is produced in the online change of continuous casting.
The present invention solves its technical problem and adopts following technical scheme:
Method for the online adjustment width increase of continuous cast mold on a large scale provided by the invention, specifically: with base shell solidification shrinkage as starting point, crystallizer width increase process is imported in the on-line width adjustment process, this process is that width increases process, and rapid control parameter of determining to transfer wide process, comprising: transfer wide speed, transfer wide time and wedge-shaped segment length.Instruct the operation of continuous cast mold on-line width adjustment with this, realize that online heat is transferred wide process on a large scale, this process is that width increases process
Described method for the online adjustment width increase of continuous cast mold on a large scale, its step comprises:
The first step, judge and transfer wide region:
At first, according to current actual value and final goal value, judge whether can carry out continuous cast mold on-line width adjustment on a large scale, transfer wide region then directly to stop transferring wide calculating if exceed; If within accent wide region allowable, then the continuation judgement is once transferred wide or is repeatedly transferred wide;
In second step, transfer wide control parameter to determine:
Transfer wide speed to be determined to obtain by formula (1):
（1）
Vm is for transferring wide speed in the formula, and Vc is the continuous casting casting speed, and tan θ transfers in the wide process, tapering angle value after changing, and tan α transfers wide Cheng Qian, the angle value of conical degree of crystallizer crossed;
Transfer the wide time to be determined to obtain by formula (2):
In the formula, t transfers the wide time, and Vm is for transferring wide speed, and Vc is the continuous casting casting speed, and Δ L is tapering change amount, and W transfers wide width value, and l is the crystallizer effective length;
Transfer wide wedge-shaped segment length to be determined to obtain by formula (3):
In the formula, S is wedge-shaped segment length, and Vc is the continuous casting casting speed, and t transfers the wide time.
The accent wide speed of the present invention by setting, transfer wide time and wedge-shaped segment length, just can know in detail and transfer wide each stage, and carry out that the online heat accent of continuous cast mold is wide on a large scale.
The online heat of described continuous cast mold is on a large scale transferred wide, and wherein " on a large scale " refers to that monolateral accent wide region surpasses the wide process of accent of 20 mm.
The present invention compared with prior art has following main beneficial effect:
This method can be slowed down strand effect copper coin frictional force, and simple and feasible is easy to operate, is high efficiency continuous casting production, raising conticaster production capacity and efficient, and increasing recovery rate of iron provides feasible method.
This method with base shell solidification shrinkage as starting point, crystallizer width increase process is imported in the calculating of on-line width adjustment (width increase) process, and determine rapidly to transfer wide (width increase) process control parameters, comprising: transfer wide speed, transfer wide time and wedge-shaped segment length.By default conical degree of crystallizer change amount, 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 of translation, realized the coupling of on-line width adjustment process and process of billet withdrawal, 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.This provides condition for high efficiency continuous casting, to reducing production costs, improves the quality of production, improves the competitiveness of product in market and has 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 are transferred wide, and width increases in the production process of 96 mm.To transfer in the traditional handicraft and transfer wide speed to be set at 6～8 mm/min in the wide process, the translation that this initial solidification shell solidified shell contraction change before going out crystallizer that just causes meniscus to begin to solidify does not catch up with narrow copper plate changes, cause between solidified shell and the mould at narrow copper coin and have the gap, influence the normal freezing contraction process of high temperature strand greatly, caused continuous casting production hidden danger easily.
And by the wide process of the accent of setting in this 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.Transfer wide speed to be set at 5 mm/min by at first setting, make in the transferring wide process solidified shell of change width that the support of mould at narrow copper coin be arranged on the one hand, be not subjected to the extruding of copper coin in addition again, the unstressed base shell that causes is out of shape, slow down solidified shell to the wearing and tearing of narrow copper plate, reduce the continuous casting billet defective and generate probability.
In addition, transfer in the wide process in translation, the wide degree of the accent of setting is transferred wide speed and transferred wide process can realize that the continuous translation of crystallizer upper and lower opening changes, and is very favourable to the equipment direct motion, also prolonged the service life of equipment simultaneously.To sum up, this method is improved the quality of production to reducing production costs, and improves the competitiveness of product in market and has very important meaning.
Description of drawings
Fig. 1 is in example 1, transfers the wide continuous cast mold upper and lower opening time corresponding displacement relation that obtains.
Fig. 2 is in example 2, transfers the wide continuous cast mold upper and lower opening time corresponding displacement relation that obtains.
The specific embodiment
Method for the online adjustment width increase of continuous cast mold on a large scale provided by the invention, specifically: with base shell solidification shrinkage as starting point, crystallizer width increase process is imported in the on-line width adjustment process, this process is that width increases process, and rapid control parameter of determining to transfer wide process, comprising: transfer wide speed, transfer wide time and wedge-shaped segment length.Instruct the operation of continuous cast mold on-line width adjustment with this, realize that online heat is transferred wide process on a large scale, this process is that width increases process
Described method for the online adjustment width increase of continuous cast mold on a large scale, its step comprises:
The first step, judge and transfer wide region:
At first, according to current actual value and final goal value, judge whether can carry out continuous cast mold on-line width adjustment on a large scale, transfer wide region then directly to stop transferring wide calculating if exceed; If within accent wide region allowable, then the continuation judgement is once transferred wide or is repeatedly transferred wide;
In second step, transfer wide control parameter to determine:
Transfer wide speed to be determined to obtain by formula (1):
Vm is for transferring wide speed in the formula, and Vc is the continuous casting casting speed, and tan θ transfers in the wide process, tapering angle value after changing, and tan α transfers wide Cheng Qian, the angle value of conical degree of crystallizer crossed;
Transfer the wide time to be determined to obtain by formula (2):
In the formula, t transfers the wide time, and Vm is for transferring wide speed, and Vc is the continuous casting casting speed, and Δ L is tapering change amount, and W transfers wide width value, and l is the crystallizer effective length;
Transfer wide wedge-shaped segment length to be determined to obtain by formula (3):
In the formula, S is wedge-shaped segment length, and Vc is the continuous casting casting speed, and t transfers the wide time.
The accent wide speed of the present invention by setting, transfer wide time and wedge-shaped segment length, just can know in detail and transfer wide each stage, and carry out that the online heat accent of continuous cast mold is wide on a large scale.
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 4.5 mm at the one-sided tapering of crystallizer, transferring wide process tapering recruitment is 4.5 mm, casting speed 1.0 m/min, crystallizer height 900 mm, meniscus level 800 mm, both sides are transferred wide, width increases by 96 mm, obtains corresponding accent wide process speed, time and wedge-shaped segment length relation.
As the above analysis, the crystallizer both sides are transferred wide, wide degree 48 mm of one-sided accent.Transfer that relevant parameter can be set in the wide process:
tanα=4.5/900， tanθ=(4.5+4.5)/900，V
c=1200 mm/min，
l=800 mm，
Δl=4.5 mm，W=48 mm
Therefore:
1. transfer wide speed:
（1）
2. transfer the wide time:
3. wedge-shaped segment length:
Present embodiment 1 is in transferring wide process, and it obtains crystallizer upper and lower opening time corresponding displacement relation as shown in Figure 1.As shown in Figure 1: this process changes via tapering, and reset three processes of copper coin translation and tapering are formed, and by accelerating to become the awl process slowly, have realized that tapering is changed to setting value (changing 4.5 mm).In this process, the crystallizer upper and lower opening moves simultaneously, the hydraulic cylinder travel continuous and even variation.In arriving the translation process, crystallizer upper and lower opening speed reaches preset value 8 mm/min simultaneously, realization meets the online heat of crystallizer of solidification shrinkage criterion and transfers wide, accordingly after translation reaches predeterminated position, the crystallizer upper and lower opening reduces speed now simultaneously, the slow even variation of speed realizes that tapering resets.Guarantee on the one hand in this process that wide the contraction with casting blank solidification of crystallizer accent conforms to, the base shell is not subjected to stress, crystallizer is not produced extra accent wide-wheel grinding and decreases, and guarantees simultaneously that high temperature solidifies the diabatic process between strand and the crystallizer narrow copper plate yet.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, this process changes via tapering, and copper coin translation and tapering three processes that reset realize crystallizer width adjustment process fast, in casting process, continuously, efficient, stable, safety in production provides necessary guarantee.
Embodiment 2:
Be 6 mm at the one-sided tapering of crystallizer, transferring wide process tapering recruitment is 6 mm, casting speed 0.8 m/min, crystallizer height 900 mm, meniscus level 800 mm, both sides are transferred wide, width increases by 32 mm, obtains corresponding accent wide process speed, time and wedge-shaped segment length relation.
As the above analysis, the crystallizer both sides are transferred wide, wide degree 16 mm of one-sided accent.Transfer that relevant parameter can be set in the wide process:
tanα=6/900， tanθ=(6+6)/900，V
c=800 mm/min，
l=800 mm，
Δl=6 mm，W=16 mm
Therefore:
1. transfer wide speed:
2. transfer the wide time:
3. wedge-shaped segment length:
Present embodiment 2 is in transferring wide process, and it obtains crystallizer upper and lower opening time corresponding displacement relation as shown in Figure 2.As shown in Figure 2: this process changes via tapering, and reset three processes of copper coin translation and tapering are formed, and by accelerating to become the awl process slowly, have realized that tapering is changed to setting value (changing 6 mm).In this process, the crystallizer upper and lower opening moves simultaneously, the hydraulic cylinder travel continuous and even variation.In arriving the translation process, crystallizer upper and lower opening speed reaches preset value 5.33 mm/min simultaneously, realization meets the online heat of crystallizer of solidification shrinkage criterion and transfers wide, accordingly after translation reaches predeterminated position, the crystallizer upper and lower opening reduces speed now simultaneously, the slow even variation of speed realizes that tapering resets.Guarantee on the one hand in this process that wide the contraction with casting blank solidification of crystallizer accent conforms to, the base shell is not subjected to stress, crystallizer is not produced extra accent wide-wheel grinding and decreases, and guarantees simultaneously that high temperature solidifies the diabatic process between strand and the crystallizer narrow copper plate yet.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, this process changes via tapering, and copper coin translation and tapering three processes that reset realize crystallizer width adjustment process fast, in casting process, continuously, efficient, stable, safety in production provides necessary guarantee.
Claims (2)
1. one kind is used for the method that the online adjustment width of continuous cast mold on a large scale increases, it is characterized in that with base shell solidification shrinkage as starting point, crystallizer width increase process is imported in the on-line width adjustment process, this process is that width increases process, and rapid control parameter of determining to transfer wide process, comprising: transfer wide speed, transfer wide time and wedge-shaped segment length; Instruct the operation of continuous cast mold on-line width adjustment with this, realize that online heat is transferred wide process on a large scale, this process is that width increases process;
Described on-line width adjustment process control parameters is obtained by following method, and its step comprises:
The first step, judge and transfer wide region:
At first, according to current actual value and final goal value, judge whether can carry out continuous cast mold on-line width adjustment on a large scale, transfer wide region then directly to stop transferring wide calculating if exceed; If within accent wide region allowable, then the continuation judgement is once transferred wide or is repeatedly transferred wide;
In second step, transfer wide control parameter to determine:
Transfer wide speed to be determined to obtain by formula (1):
V
m＝V
c(tanθ-tanα) (1)
V in the formula
mFor transferring wide speed, V
cBe the continuous casting casting speed, tan θ transfers in the wide process, tapering angle value after changing, and tan α transfers wide Cheng Qian, the angle value of conical degree of crystallizer crossed;
Transfer the wide time to be determined to obtain by formula (2):
In the formula: t transfers wide time, V
mFor transferring wide speed, V
cBe the continuous casting casting speed, Δ L is tapering change amount, and W transfers wide width value, and l is the crystallizer effective length;
Transfer wide wedge-shaped segment length to be determined to obtain by formula (3):
S＝V
ct (3)
In the formula: S is wedge-shaped segment length, and Vc is the continuous casting casting speed, and t transfers the wide time.
2. the purposes of the method that increases of the online adjustment width of the described continuous cast mold on a large scale of claim 1, it is characterized in that accent wide speed, accent wide time and the wedge-shaped segment length of this method by setting, with each stage of knowing that the online adjustment width of continuous cast mold increases, and carry out on a large scale the online heat of continuous cast mold and transfer wide.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102601326B (en) * | 2012-03-23 | 2014-03-12 | 中冶南方工程技术有限公司 | Method for continuously and rapidly adjusting width increase of mold in online manner |
| CN102601335B (en) * | 2012-03-23 | 2014-01-01 | 中冶南方工程技术有限公司 | Method for continuously and rapidly adjusting width decrease of mold in online manner |
| CN102581237B (en) * | 2012-03-23 | 2014-02-12 | 中冶南方工程技术有限公司 | Method for rapidly adjusting width increase of mold in online stepped manner |
| 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 |
| 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 |
| CN115156490A (en) * | 2022-08-19 | 2022-10-11 | 日照钢铁控股集团有限公司 | Narrow-face copper plate shape design method, device, medium and equipment |
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| US4660617A (en) * | 1984-11-09 | 1987-04-28 | Nippon Steel Corporation | Method of changing width of slab in continuous casting |
| CN85108654A (en) * | 1985-01-19 | 1986-09-24 | 曼内斯曼股份公司 | Adjust the method and apparatus of norrow side plate of crystallizer of continuous casting of metal, especially steel |
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Effective date of registration: 20201123 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. |