CN102601326A - Method for continuously and rapidly adjusting width increase of mold in online manner - Google Patents

Abstract

A method for continuously and rapidly adjusting width increase 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 increase 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 increase) 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 increases

Technical field

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

Background technology

Crystallizer 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, and manual adjustment crystallizer width perhaps realizes that through changing crystallizer width changes.Shut down secondary at conticaster and open under the situation of watering, aforesaid operations influenced 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 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 has important role.

Summary of the invention

Technical problem to be solved by this invention just provides the method that a kind of on-line continuous rapid adjustment crystallizer width increases; This method simple and feasible; For being used for continuous casting production online quick hot accent wide (width increase) process fast way is provided, thereby has satisfied the requirement that the strand size is produced in the online change of continuous casting.

For solving the problems of the technologies described above; The method that a kind of on-line continuous rapid adjustment crystallizer width provided by the invention increases; Process of setting with high-temperature molten steel is the basis, from the solidification shrinkage of base shell, crystallizer width increase process is imported in the on-line width adjustment process; And definite rapidly control parameter of transferring wide process; The control parameter comprises cone adjusting time, the wide speed of accent and transfers wide process total time, instructs the continuous cast mold on-line continuous to transfer wide operation with this, realizes the wide process of the online fast velocity modulation of crystallizer.

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

The first step, judge and transfer wide region:

Based on current actual value and final goal value, confirm tapering variable quantity and the detailed procedure that should transfer wide process continuously;

Second step, the control Determination of Parameters:

Said cone adjusting time t ₁Confirm to obtain by formula (1):

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{{\mathrm{at}}_0}+t_0---\left(1\right)$

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

The wide speed V of said accent _mConfirm to obtain by formula (2):

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

T of wide process total time of said accent is confirmed to obtain by formula (3):

$t={2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{{\mathrm{\&Delta;<figure-callout\; id="2"\; label="T"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}^2}{{{\mathrm{at}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}---\left(3\right)$

In the formula, L is for transferring wide variable quantity.

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

Therefore,, just can know each stage that accent is wide in detail, and it is wide to carry out the online fast velocity modulation of crystallizer through setting the cone adjusting time, transferring wide speed and transfer wide process total time.

In the technique scheme, during the control parameter of the wide process of said definite accent, also consider to transfer wide wedge-shaped segment length.

Further, the wide wedge-shaped segment length of said accent S is confirmed to obtain by formula (4):

S＝V _ct (4)

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

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

With base shell solidification shrinkage as starting point; Crystallizer width increase process is imported in the on-line width adjustment process; And definite rapidly control parameter of transferring wide (width increase) process; Comprise: the cone adjusting time, transfer wide speed and transfer wide process total time, and can transfer wide wedge-shaped segment length, transfer wide process with this next further standard through transferring wide process total time to calculate.Through preset conical degree of crystallizer variable quantity; The essential characteristic that the natural amount of contraction 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 technology of traditional accent that the crystallizer upper and lower opening is transferred wide slow drawback; Slowed down and transferred in the wide process molten steel, also stablized the solidification and heat transfer process of molten steel in the continuous cast mold simultaneously 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.

In actual production; One-sided tapering be 4.5mm, casting speed be 1.0m/min, highly for 900mm, meniscus level are that certain crystallizer of 800mm is an example, molten steel export time 0.8min from the meniscus to the crystallizer, accent is wide in both sides; Width increases in the wide production process of accent of 200mm; Traditional handicraft will transfer the wide speed of the accent in the wide process to be set at 6～8mm/min, and so the low wide speed of accent will cause and transfer wide wedge-shaped segment length excessive, produce huge waste.

And, will transfer wide process and process of billet withdrawal to mate through the wide process of the accent of setting in the inventive method, realize transferring wide process to conform to the solidification shrinkage of base shell.Through at first setting the wide process tapering recruitment of accent is that 20mm, the wide acceleration of accent are 20mm/min ², make in transferring wide process with the solidification shrinkage to be the basis, promote rapidly and transfer wide speed, in 6.05min, promptly accomplish the wide process of transferring, promoted more than one times than the wide time of the accent 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.

Description of drawings

Fig. 1 is in the embodiment of the invention 1, transfers wide upper and lower mouthful of time corresponding displacement relation of the crystallizer figure that obtains;

Fig. 2 is in the embodiment of the invention 2, transfers wide upper and lower mouthful of time corresponding displacement relation of the crystallizer figure that obtains.

The specific embodiment

Below in conjunction with accompanying drawing specific embodiment of the present invention is done further to describe in detail:

The method that on-line continuous rapid adjustment crystallizer width of the present invention increases; Process of setting with high-temperature molten steel is the basis, from the solidification shrinkage of base shell, crystallizer width increase process is imported in the on-line width adjustment process; And definite rapidly control parameter of transferring wide process; The control parameter comprises cone adjusting time, the wide speed of accent and transfers wide process total time, instructs the continuous cast mold on-line continuous to transfer wide operation with this, realizes the wide process of the online fast velocity modulation of crystallizer.

The control parameter of the wide process of above-mentioned accent is obtained by the following step:

The first step, judge and transfer wide region:

Based on current actual value and final goal value, confirm tapering variable quantity and the detailed procedure that should transfer wide process continuously;

Second step, the control Determination of Parameters:

Said cone adjusting time t ₁Confirm to obtain by formula (1):

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{{\mathrm{at}}_0}+t_0---\left(1\right)$

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

The wide speed V of said accent _mConfirm to obtain by formula (2):

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

T of wide process total time of said accent is confirmed to obtain by formula (3):

$t={2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{{\mathrm{\&Delta;<figure-callout\; id="2"\; label="T"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}^2}{{{\mathrm{at}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}---\left(3\right)$

In the formula, L is for transferring wide variable quantity.

In addition, also can consider to transfer wide wedge-shaped segment length.Transfer wide wedge-shaped segment length S to confirm to obtain by formula (4):

S＝V _ct (4)

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

Below in conjunction with two case histories the present invention is elaborated:

Embodiment 1:

The one-sided tapering of this crystallizer is 4.5mm, transfers that the tapering recruitment is 20mm in the wide process, transfers wide acceleration to be set at 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, both sides are transferred wide, and width increases 200mm; Obtain corresponding accent wide process speed, time and wedge-shaped segment length relation.

Can know that by above-mentioned analysis the crystallizer both sides are transferred wide, the wide degree of then one-sided accent 100mm, i.e. L=100mm.Accordingly, Δ T=20mm, 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:

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{{\mathrm{at}}_0}+{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0=2.05\min ---\left(1\right)$

2, transfer wide speed V _m:

$V_m=\frac{\mathrm{\&Delta;<figure-callout\; id="0"\; label="T\; t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}{t_{}}=25\mathrm{mm}/\min ---\left(2\right)$

3, transfer wide process total time t:

$t={2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{{\mathrm{\&Delta;<figure-callout\; id="2"\; label="T"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}^2}{{{\mathrm{at}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}=6.05\min ---\left(3\right)$

4, transfer wide wedge-shaped segment length S:

S＝V _ct＝6.05m (4)

Transfer in the wide process in tradition; Change awl, translation and tapering through crystallizer recover the variation that three processes can realize width; But (6～8mm/min), the wide process of whole accent is too time-consuming, and wedge shape base length is long to be subject to the wide speed of low accent; Surpassed 15m, so well do not embody the advantage of crystallizer on-line width modulation technology.And this embodiment is in transferring wide process, and it is as shown in Figure 1 that it obtains crystallizer upper and lower opening time corresponding displacement relation.Can be known by Fig. 1: this process changes via tapering, and reset three processes of copper coin translation and tapering are formed, and become the awl process through setting continuous acceleration, have realized the rapid variation of conical degree of crystallizer, can promote the wide speed of transferring rapidly.In arriving the translation process, crystallizer upper and lower opening speed reaches preset value 25mm/min simultaneously, and the online hot accent of crystallizer of having realized meeting the solidification shrinkage criterion is wide.Accordingly, after translation reached predeterminated position, the crystallizer upper and lower opening began to bore again continuously change procedure.

This is transferred and has guaranteed on the one hand in the wide process that wide the contraction with casting blank solidification of crystallizer accent conforms to, and makes the base shell not receive stress, crystallizer is not produced extra accent wide-wheel grinding and decreases, and has guaranteed that also high temperature solidifies the good heat transfer process between strand and the crystallizer narrow copper plate simultaneously; On the other hand, realized that the wide process of fast velocity modulation changes, to enhancing productivity, reducing cost has very important meaning.

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

Embodiment 2:

The one-sided tapering of this crystallizer is 6mm, transfers that the tapering recruitment is 25mm in the wide process, transfers wide acceleration to be set at 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, both sides are transferred wide, and width increases 300mm; Obtain corresponding accent wide process speed, time and wedge-shaped segment length relation.

Can know that by above-mentioned analysis the crystallizer both sides are transferred wide, the wide degree of then one-sided accent 150mm, i.e. L=150mm.Accordingly, Δ T=25mm, 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:

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{\mathrm{\&Delta;T}}{{\mathrm{at}}_0}+{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0=2.883\min ---\left(1\right)$

2, transfer wide speed V _m:

$V_m=\frac{\mathrm{\&Delta;<figure-callout\; id="0"\; label="T\; t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}{t_{}}=31.25\mathrm{mm}/\min ---\left(2\right)$

3, transfer wide process total time t:

$t={2\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+\frac{(L-\frac{{\mathrm{\&Delta;<figure-callout\; id="2"\; label="T"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">T</figure-callout>}}^2}{{{\mathrm{at}}_0}^2}-\mathrm{\&Delta;T}){\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="HDA0000146517050000011.png,HDA0000146517050000012.png"\; state="\{\{state\}\}">t</figure-callout>}}_0}{\mathrm{\&Delta;T}}=7.684\min ---\left(3\right)$

4, transfer wide wedge-shaped segment length S:

S＝V _ct＝7.684m (4)

Transfer in the wide process in tradition; Change awl, translation and tapering through crystallizer recover the variation that three processes can realize width; But (6～8mm/min), the wide process of whole accent is too time-consuming, and wedge shape base length is long to be subject to the wide speed of low accent; Surpassed 22m, so well do not embody the advantage of crystallizer on-line width modulation technology.And this embodiment is in transferring wide process, and it is as shown in Figure 2 that it obtains crystallizer upper and lower opening time corresponding displacement relation.Can be known by Fig. 2: this process changes via tapering, and reset three processes of copper coin translation and tapering are formed, and become the awl process through setting continuous acceleration, have realized the rapid variation of conical degree of crystallizer, can promote the wide speed of transferring rapidly.In arriving the translation process, crystallizer upper and lower opening speed reaches preset value 31.25mm/min simultaneously, and the online hot accent of crystallizer of having realized meeting the solidification shrinkage criterion is wide.Accordingly, after translation reached predeterminated position, the crystallizer upper and lower opening began to bore again continuously change procedure.

This is transferred and has guaranteed on the one hand in the wide process that wide the contraction with casting blank solidification of crystallizer accent conforms to, and makes the base shell not receive stress, crystallizer is not produced extra accent wide-wheel grinding and decreases, and has guaranteed that also high temperature solidifies the good heat transfer process between strand and the crystallizer narrow copper plate simultaneously; On the other hand, realized that the wide process of fast velocity modulation changes, to enhancing productivity, reducing cost has very important meaning.

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

Claims (6)

1. the method that increases of an on-line continuous rapid adjustment crystallizer width; It is characterized in that: this method is the basis with the process of setting of high-temperature molten steel, from the solidification shrinkage of base shell, crystallizer width increase process is imported in the on-line width adjustment process; And definite rapidly control parameter of transferring wide process; The control parameter comprises cone adjusting time, the wide speed of accent and transfers wide process total time, instructs the continuous cast mold on-line continuous to transfer wide operation with this, realizes the wide process of the online fast velocity modulation of crystallizer.

2. the method that on-line continuous rapid adjustment crystallizer width according to claim 1 increases is characterized in that the control parameter of the wide process of said accent is obtained by the following step:

The first step, judge and transfer wide region:

Based on current actual value and final goal value, confirm tapering variable quantity and the detailed procedure that should transfer wide process continuously;

Second step, the control Determination of Parameters:

Said cone adjusting time t ₁Confirm to obtain by formula (1):

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

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

The wide speed V of said accent _mConfirm to obtain by formula (2):

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

T of wide process total time of said accent is confirmed to obtain 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 the formula, L is for transferring wide variable quantity.

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

4. according to the method for claim 2 or 3 described on-line continuous rapid adjustment crystallizer width increases, it is characterized in that: the wide acceleration a of said accent is 0～25mm/min ²

5. the method that on-line continuous rapid adjustment crystallizer width according to claim 1 and 2 increases is characterized in that: during the control parameter of the wide process of said definite accent, also consider to transfer wide wedge-shaped segment length.

6. the method that on-line continuous rapid adjustment crystallizer width according to claim 5 increases is characterized in that: the wide wedge-shaped segment length of said accent S is confirmed to obtain by formula (4):

S＝V _ct (4)

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

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