CN102601335B - Method for continuously and rapidly adjusting width decrease of mold in online manner - Google Patents

Abstract

A method for continuously and rapidly adjusting width decrease of a mold in an online manner relates to online width adjustment for the continuous casting mold. Based on the solidification process of high-temperature molten steel, from solidification contraction of a billet shell, the width decrease process of the mold is led into an online width adjustment process, and control parameters of the width adjustment process are rapidly determined and include taper adjusting time, width adjusting speed and overall time of the width adjustment process, so that online continuous width adjustment for the continuous casting mold is instructed, and the online rapid width adjustment process of the mold is realized. The method is simple and practical and provides a convenient way for the online rapid hot width adjustment (width decrease) process in continuous casting production, thereby meeting the requirement of continuous casting on online change of the size of a production casting billet.

Description

The method that on-line continuous rapid adjustment crystallizer width reduces

Technical field

The present invention relates to the on-line width adjustment of continuous cast mold, refer to particularly a kind of method that on-line continuous rapid adjustment crystallizer width reduces.

Background technology

Crystallizer is as the core component of conticaster, and its properity directly affects the adaptability of slab quality and steel grade.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.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.Open and water in the situation that conticaster is shut down secondary, aforesaid operations affected on the one hand steel mill rhythm of production, reduced strand output; Shut down to open to water on the other hand and also cause raw-material waste, increase production cost.For this reason, exploitation adapts to the continuous need of production of multiple rules strand, shortens the continuous on-line width adjustment technology of crystallizer of producing time, reduce labour intensity, improving slab quality and have extremely important effect.

Summary of the invention

Technical problem to be solved by this invention just is to provide a kind of method that on-line continuous rapid adjustment crystallizer width reduces, the method simple and feasible, provide approach easily for produce online quick hot tune wide (width reduces) process for continuous casting, thereby meet continuous casting, changed online the requirement of producing the strand size.

For solving the problems of the technologies described above, the method that a kind of online rapid adjustment crystallizer width provided by the invention reduces, the process of setting of high-temperature molten steel of take is basis, solidification shrinkage from the base shell, the crystallizer width is reduced to process and import in the on-line width adjustment process, and determine the control parameter of adjusting wide process rapidly, control parameter and comprise the cone adjusting time, adjust wide speed and adjust wide process total time, with this, instruct the continuous cast mold on-line continuous to adjust wide operation, realize the online fast wide process of velocity modulation of crystallizer.

In technique scheme, the control parameter of the wide process of described tune is obtained by the following step:

The first step, judge and adjust wide region:

According to current actual value and final goal value, determine the tapering variable quantity and should adjust continuously the detailed procedure of wide process;

Second step, control determining of parameter:

Described cone adjusting time t ₁determine and obtain by formula (1):

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{a{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}+t_0---\left(1\right)$

In formula, Δ T is for adjusting wide tapering variable quantity, and a is for adjusting wide acceleration, t ₀for the meniscus molten steel is pulled out the crystallizer time;

The wide speed V of described tune _mdetermine and obtain by formula (2):

$V_m=\frac{\mathrm{\&Delta;T}}{t_0}---\left(2\right)$

T of wide process total time of described tune is determined and is obtained by formula (3):

$t=2{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{\mathrm{\&Delta;}{T}^2}{a{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}---\left(3\right)$

In formula, L is for adjusting wide variable quantity.

Further, the wide tapering variation delta of described tune T is 0～40mm; The wide acceleration a of described tune is 0～25mm/min ².

Therefore, by setting the cone adjusting time, adjusting wide speed and adjust wide process total time, just can know in detail and adjust each wide stage, and velocity modulation is wide soon online to carry out crystallizer.

In technique scheme, during the control parameter of the wide process of described definite tune, also consider to adjust wide wedge-shaped segment length.

Further, the wide wedge-shaped segment length of described tune S is determined and is obtained by formula (4):

S＝V _ct (4)

In formula: V _cfor the continuous casting casting speed, t is for adjusting wide process total time.

Compared with prior art, beneficial effect of the present invention is:

Using base shell solidification shrinkage as starting point, the crystallizer width is reduced to process to be imported in the on-line width adjustment process, and the rapid control parameter of determining wide (width reduces) process of tune, comprise: the cone adjusting time, adjust wide speed and adjust wide process total time, and can adjust wide wedge-shaped segment length by adjusting wide process total time to calculate, with this, come further standard to adjust wide process.By default conical degree of crystallizer variable quantity, the essential characteristic that the natural shrinking amount of utilizing tapering to change high temperature billet shell in the process of setting with molten steel conforms to, the process of billet withdrawal of high temperature billet shell is limited on the mould at narrow of translation, realized the rapid coupling of on-line width adjustment process and process of billet withdrawal, successfully overcome in the wide technique of traditional tune, the crystallizer upper and lower opening is adjusted wide slow drawback, slowed down and adjusted the wearing and tearing of molten steel to narrow copper plate in wide process, also stablized the solidification heat transfer process of molten steel in continuous cast mold simultaneously.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.

In actual production, one-sided tapering is that 9mm, casting speed are 1.0m/min, for 900mm, meniscus level, being highly 800mm, certain crystallizer is example, molten steel exports time 0.8min from the meniscus to the crystallizer, in both sides, adjust wide, width reduces in the wide production process of tune of 400mm, it is 6～8mm/min that traditional handicraft will be adjusted the wide Speed Setting of the tune in wide process, and so the low wide speed of tune will cause and adjust wide wedge-shaped segment length excessive, produce huge waste.

And, by the wide process of the tune of setting in the inventive method, will adjust wide process and process of billet withdrawal to be mated, realize adjusting wide process to conform to the solidification shrinkage of base shell.By at first set adjusting wide process tapering decrease, be 30mm, to adjust wide acceleration be 20mm/min ², make and take solidification shrinkage as basis in adjusting wide process, promote and adjust wide speed rapidly, complete the wide process of adjusting in 8.008min, promoted more than one times than the wide time of the tune of traditional handicraft, improve operating efficiency and reduced the waste of wedge shape base.

In sum, the inventive method has very important meaning to reducing production costs, improve the quality of production and improving the competitiveness of product in market.

The accompanying drawing explanation

Fig. 1 is in the embodiment of the present invention 1, adjusts the wide upper and lower mouthful of corresponding time shifting graph of a relation of crystallizer that obtain;

Fig. 2 is in the embodiment of the present invention 2, adjusts the wide upper and lower mouthful of corresponding time shifting graph of a relation of crystallizer that obtain.

The specific embodiment

Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail:

The method that a kind of on-line continuous rapid adjustment crystallizer width of the present invention reduces, the process of setting of high-temperature molten steel of take is basis, solidification shrinkage from the base shell, the crystallizer width is reduced to process to be imported in the on-line width adjustment process, and the rapid control parameter of determining the wide process of tune, control parameter and comprise the cone adjusting time, adjust wide speed and adjust wide process total time, with this, instruct the continuous cast mold on-line continuous to adjust wide operation, realize the online fast wide process of velocity modulation of crystallizer.

In technique scheme, the control parameter of the wide process of described tune is obtained by the following step:

The first step, judge and adjust wide region:

According to current actual value and final goal value, determine the tapering variable quantity and should adjust continuously the detailed procedure of wide process;

Second step, control determining of parameter:

Described cone adjusting time t ₁determine and obtain by formula (1):

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{a{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}+t_0---\left(1\right)$

In formula, Δ T is for adjusting wide tapering variable quantity, usually getting 0～40mm, and a is for adjusting wide acceleration, usually getting 0～25mm/min ², t ₀for the meniscus molten steel is pulled out the crystallizer time;

The wide speed V of described tune _mdetermine and obtain by formula (2):

$V_m=\frac{\mathrm{\&Delta;T}}{t_0}---\left(2\right)$

T of wide process total time of described tune is determined and is obtained by formula (3):

$t=2{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{\mathrm{\&Delta;}{T}^2}{a{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}---\left(3\right)$

In formula, L is for adjusting wide variable quantity.

In addition, also can consider to adjust wide wedge-shaped segment length.Adjust wide wedge-shaped segment length S to determine and obtain by formula (4):

S＝V _ct (4)

In formula: V _cfor the continuous casting casting speed, t is for adjusting wide process total time.

Below in conjunction with two case histories, the present invention is described in detail:

Embodiment 1:

The one-sided tapering of this crystallizer is 9mm, and adjusting tapering decrease in wide process is 30mm, adjusts wide acceleration to be set as 20mm/min ², casting speed is 1.0m/min, the crystallizer height is that 900mm, meniscus level are 800mm, molten steel exports time 0.8min from the meniscus to the crystallizer, and both sides are adjusted wide, and width reduces 400mm, obtain corresponding tune wide process speed, time and wedge-shaped segment length relation.

As the above analysis, the crystallizer both sides are adjusted wide, the wide degree of one-sided tune 200mm, i.e. L=200mm.Accordingly, Δ T=30mm, a=20mm/min ², t ₀=0.8min, V _c=1.0m/min=1000mm/min.So each is controlled parameter and is:

1, cone adjusting time t ₁:

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{a{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}+{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0=2.675\min ---\left(1\right)$

2, adjust wide speed V _m:

$V_m=\frac{\mathrm{\&Delta;<figure-callout\; id="0"\; label="T\; t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}{t_{}}=37.5\mathrm{mm}/\min ---\left(2\right)$

3, adjust wide process total time t:

$t=2{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{\mathrm{\&Delta;}{T}^2}{a{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}=8.088\min ---\left(3\right)$

4, adjust wide wedge-shaped segment length S:

S＝V _ct＝8.008m (4)

In tradition, adjust in wide process, change cone, translation and tapering by crystallizer recover the variation that three processes can realize width, but be limited to the wide speed of too low tune (6～8mm/min), the wide process of whole tune is too time-consuming, wedge shape base length is long, surpassed 30m, so well do not embody the advantage of crystallizer on-line width modulation technology.And this embodiment is in adjusting wide process, it obtains time shifting relation that the crystallizer upper and lower opening is corresponding 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 form, and by setting continuous acceleration, become the cone process, have realized the rapid variation of conical degree of crystallizer, can promote rapidly the wide speed of adjusting.In arriving the translation process, crystallizer upper and lower opening speed reaches preset value 37.5mm/min simultaneously, and the online hot tune of crystallizer of having realized meeting the solidification shrinkage criterion is wide.Accordingly, after translation reaches predeterminated position, the crystallizer upper and lower opening starts to bore again continuously change procedure.

This is adjusted in wide process and to have guaranteed on the one hand that crystallizer is adjusted and widely with casting blank solidification, shrink and conform to, and makes the base shell not be subject to stress, crystallizer is not produced to extra tune wide-wheel grinding and damages, and the while has also guaranteed the good heat transfer process between high temperature coagulation strand and narrow face copper plate of crystallizer; On the other hand, realized the wide change in process of fast velocity modulation, to enhancing productivity, reduced costs tool and have very important significance.

In a word, this process changes via tapering, and copper coin translation and tapering three processes that reset, realized crystallizer width adjustment process fast, in casting process, continuously, efficient, stable, safety in production provides necessary guarantee.

Embodiment 2:

The one-sided tapering of this crystallizer is 6mm, and adjusting tapering decrease in wide process is 15mm, adjusts wide acceleration to be set as 15mm/min ², casting speed is 1.0m/min, the crystallizer height is that 900mm, meniscus level are 800mm, molten steel exports time 0.8min from the meniscus to the crystallizer, and both sides are adjusted wide, and width reduces 200mm, obtain corresponding tune wide process speed, time and wedge-shaped segment length relation.

As the above analysis, the crystallizer both sides are adjusted wide, the wide degree of one-sided tune 100mm, i.e. L=100mm.Accordingly, Δ T=15mm, a=15mm/min ², t ₀=0.8min, V _c=1.0m/min=1000mm/min.So each is controlled parameter and is:

1, cone adjusting time t ₁:

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{a{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}+{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0=2.05\min ---\left(1\right)$

2, adjust wide speed V _m:

$V_m=\frac{\mathrm{\&Delta;<figure-callout\; id="0"\; label="T\; t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}{t_{}}=18.75\mathrm{mm}/\min ---\left(2\right)$

3, adjust wide process total time t:

$t=2{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{\mathrm{\&Delta;}{T}^2}{a{{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146519050000011.png,HDA0000146519050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}=7.383\min ---\left(3\right)$

4, adjust wide wedge-shaped segment length S:

S＝V _ct＝7.383m (4)

In tradition, adjust in wide process, change cone, translation and tapering by crystallizer recover the variation that three processes can realize width, but be limited to the wide speed of too low tune (6～8mm/min), the wide process of whole tune is too time-consuming, wedge shape base length is long, surpassed 15m, so well do not embody the advantage of crystallizer on-line width modulation technology.And this embodiment is in adjusting wide process, it obtains time shifting relation that the crystallizer upper and lower opening is corresponding 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 form, and by setting continuous acceleration, become the cone process, have realized the rapid variation of conical degree of crystallizer, can promote rapidly the wide speed of adjusting.In arriving the translation process, crystallizer upper and lower opening speed reaches preset value 18.75mm/min simultaneously, and the online hot tune of crystallizer of having realized meeting the solidification shrinkage criterion is wide.Accordingly, after translation reaches predeterminated position, the crystallizer upper and lower opening starts to bore again continuously change procedure.

This is adjusted in wide process and to have guaranteed on the one hand that crystallizer is adjusted and widely with casting blank solidification, shrink and conform to, and makes the base shell not be subject to stress, crystallizer is not produced to extra tune wide-wheel grinding and damages, and the while has also guaranteed the good heat transfer process between high temperature coagulation strand and narrow face copper plate of crystallizer; On the other hand, realized the wide change in process of fast velocity modulation, to enhancing productivity, reduced costs tool and have very important significance.

In a word, this process changes via tapering, and copper coin translation and tapering three processes that reset, realized crystallizer width adjustment process fast, in casting process, continuously, efficient, stable, safety in production provides necessary guarantee.

Claims (5)

1. the method that an on-line continuous rapid adjustment crystallizer width reduces, it is characterized in that: the method be take the process of setting of high-temperature molten steel and is basis, solidification shrinkage from the base shell, the crystallizer width is reduced to process to be imported in the on-line width adjustment process, and the rapid control parameter of determining the wide process of tune, control parameter and comprise the cone adjusting time, adjust wide speed and adjust wide process total time, with this, instruct the continuous cast mold on-line continuous to adjust wide operation, realize the online fast wide process of velocity modulation of crystallizer;

The control parameter of the wide process of described tune is obtained by the following step:

The first step, judge and adjust wide region:

According to current actual value and final goal value, determine the tapering variable quantity and should adjust continuously the detailed procedure of wide process;

Second step, control determining of parameter:

Described cone adjusting time t ₁determine and obtain by formula (1):

$t_1=\frac{\mathrm{\&Delta;T}}{{\mathrm{at}}_0}+t_0---\left(1\right)$

In formula, Δ T is for adjusting wide tapering variable quantity, and a is for adjusting wide acceleration, t ₀for the meniscus molten steel is pulled out the crystallizer time;

The wide speed V of described tune _mdetermine and obtain by formula (2):

$V_m=\frac{\mathrm{\&Delta;T}}{t_0}---\left(2\right)$

T of wide process total time of described tune is determined and is obtained by formula (3):

$t={2t}_1+\frac{(L-\frac{{\mathrm{\&Delta;T}}^2}{{{\mathrm{at}}_0}^2}-\mathrm{\&Delta;T})t_0}{\mathrm{\&Delta;T}}---\left(3\right)$

In formula, L is for adjusting wide variable quantity.

2. the method that on-line continuous rapid adjustment crystallizer width according to claim 1 reduces, it is characterized in that: the wide tapering variation delta of described tune T is 0～40mm.

3. the method that on-line continuous rapid adjustment crystallizer width according to claim 1 and 2 reduces, it is characterized in that: the wide acceleration a of described tune is 0～25mm/min ².

4. the method that on-line continuous rapid adjustment crystallizer width according to claim 1 reduces is characterized in that: during the control parameter of the wide process of described definite tune, also consider to adjust wide wedge-shaped segment length.

5. the method that on-line continuous rapid adjustment crystallizer width according to claim 4 reduces is characterized in that: the wide wedge-shaped segment length of described tune S is determined and is obtained by formula (4):

S=V _ct （4）

In formula: V _cfor the continuous casting casting speed, t is for adjusting wide process total time.

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