奥地利专利AT512214A1 PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE CASTING STAGE, AT THE CASTING EN

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专利摘要:
The present invention relates in each case to a method for operating a continuous casting machine (1) at casting start, at the end of casting and in the production of a transition piece (21). The object of the invention is to improve the quality of the strand ends (16, 18) and - Preventively protect the continuous casting machine (1) in the application of the method from damage. This object is achieved by a method for operating a continuous casting machine (1) at casting start by the following additional method steps: detecting a position of the strand start (16) in the strand guide (4) after the strand start (16), preferably an upper end 17a) of the strand start region (17) having passed a pair of engageable strand guide rolls (5): setting the pair to the strand (2) so that the pair contacts the strand (2); cooling the strand starting region (17) with Q <QNENN wherein the cooling nozzle (10) applies a coolant amount Q smaller than a nominal coolant amount QNENN to the strand start region (17); and cooling the strand main body (20) with Q QNENN, wherein the cooling nozzle (10) applies a coolant amount Q substantially equal to QNENN to the strand main body (20).
公开号:AT512214A1
申请号:T1792/2011
申请日:2011-12-05
公开日:2013-06-15
发明作者:
申请人:Siemens Vai Metals Tech Gmbh；
IPC主号:

专利说明:

No. 4368 p. 4
5. D z. 201 1 12:04 Siemens CIC P 201123625 1 • *
description
Process engineering measures in a continuous casting machine at casting start, at the end of casting and in the production of a 5 transition piece
Field of engineering
The present invention relates to a method for operating a continuous casting machine at the start of casting, at the end of casting and at a temporary slowing down of the casting operation.
On the one hand, the invention relates to a method for operating a continuous casting machine at casting start, wherein the continuous casting comprises a mold and a strand guide, and the strand guide at least a pair of engagable strand guide rollers and at least one cooling nozzle comprises, comprising the following steps: - Introducing a dummy strand in the continuous casting machine ; 20 - keeping the cold strand in the strand guide, with a
Cold extrusion head, the mold closes fluid-tight;
Casting the continuous casting machine, wherein liquid steel is poured into the mold and thereby an at least partially solidified strand, a strand beginning, a subsequent strand starting region with a length A, 0.5 < A < 5 m, and subsequently having a strand main body; and - Extracting the cold strand, wherein the cold strand is drawn in a casting direction from the mold. 30
On the other hand, the invention relates to a method for operating a continuous casting machine at the end of casting, the continuous casting machine comprises a mold and a strand guide, and the strand guide comprises at least a pair of engagable strand guide rollers and at least one cooling nozzle, comprising the following method steps: 05/12/2011 12: 07
No .: R890 P.004 / 032
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No. 4368 p. 5 201123825 • ·
··· ♦ 2
Continuously casting a strand, wherein in the mold liquid steel is poured into an at least partially solidified strand;
Stopping the supply of liquid steel into the mold, whereby a strand end forms in the mold, so that the strand has a strand end, a subsequent strand, with a length B, 0.5 < B < 5 m, and subsequently having a strand main part; and - pulling out the strand, wherein the strand is pulled out of the mold in a casting direction.
Finally, the invention relates to a method for operating a continuous casting machine in a temporary slowing of the casting operation (eg, in the course of a ladle change), wherein the continuous casting machine comprises a mold and a strand guide, and the strand guide comprises at least a pair of engageable strand guide rollers and at least one cooling nozzle comprising the following process steps: 20 - continuous casting of a strand, wherein in the mold liquid steel 2U is cast an at least partially solidified strand;
Drawing the strand at a speed v, wherein the strand is drawn out of the mold in a casting direction with v substantially equal to 25 a nominal velocity vMenn;
Reducing a supply rate of liquid steel into the mold, thereby starting to form a transition piece; 30 - Extract the strand with v <
Increasing the supply rate of liquid steel, thereby completing the formation of a transition piece such that the strand has a lower strand body, a transition piece, and an upper strand body; 35 - Extraction of the strand with v * vM, nn. 05/12/2011 12:07
No .: R890 P.005 / 032 Dec. 5, 2011 12:05 pm 201123825
Siemens CIC P
No. 4368 p. 6 3 # «· + # * * 9 ·· 4 · · · · · · 9 999 * · 9« · M · • 9 9 9 9 * 9999 · «9 * ··
State of the art
It is known that the operation of a continuous casting machine at casting start or at the end of pouring requires special measures to protect the machine 5 from overload and damage.
From US Pat. No. 6,779,587 B2 it is known to switch over from a position control to a pressure control in the event of an exceeding of a maximum setting force in the employment of adjustable strand guide rollers on a 10 line. This should prevent damage to the strand guide by the cold strand during casting start. Since, according to the document, the cooling at casting start is not changed compared to the rated operation, the strand beginning or 15 the strand end "too hard". cooled (i.e., the strands are significantly colder than the intervening strand). As a result, the quality of the two Strängen is reduced, so that these parts must be separated typically before a subsequent rolling process. Ultimately, this results in a lower productivity of the continuous casting machine and additional expense in the further processing of the strand. λ
It is known from US Pat. No. 4,317,482J to continuously monitor the strand extraction forces 25 in a continuous casting machine in order to prevent damage to the continuous casting machine or leakage of liquid metal ("spill-out") from the partially solidified strand. This informs the operating team about imminent problems in the continuous casting machine; However, how these problems can be prevented preventively, the font can not be found.
From EP 1 697 070 Bl Measures at a 35 distributor change are known to keep the entry of foreign particles in the strand low, Furthermore, the casting speed is reduced in the manifold change, forming a so-called transition piece. 05/12/2011 12:07
No .: R890 P.006 / 032
No. 4366 p. 1
Dec 5, 2011 12:05 Siemens CIC P 201123825 4
Concrete instructions on what measures to protect the continuous casting machine at casting start, at the end of casting or in the creation of a transition piece are made, can not be found in the above five documents.
Summary of the invention
Technical task 10
The object of the invention is to overcome the disadvantages of the prior art and to present an operating method for a continuous casting machine at casting start, at the end of casting, and at a slowing of the casting operation, with which 15 - the quality of Strängenden (Stranganfangs and
Strängendes) is improved, and the continuous casting machine in the application of the method is preventatively protected from damage. 20 Technical solution
This object is achieved by a method according to claim 1. Advantageous effects of the invention are the subject of the dependent claims. 25
Claim 1 relates to a method for operating a continuous casting machine at casting start of the type mentioned, with the additional process steps:
Detecting a position of the strand start in the strand guide; after the strand beginning, preferably an upper end of the strand beginning region, has passed through the pair of engagable strand guide rolls: setting the pair to the strand so that the pair contacts the strand; 35 - cooling the strand start region with Q < Qmnn t wherein the cooling nozzle applies a coolant quantity Q smaller than a nominal coolant quantity to the strand start region; 05/12/2011 12:08
No .: R890 P. 007/032 Dec. 5, 2011 12:06 201123825
Siernens CIC P
No. 4368 p. 8 5 φ ··· · e t »• # · · • · · < * * * 4 M ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5 The term continuous casting machine covers all casting machines which are suitable for the continuous production of a strand with a long or flat product cross section from a molten steel. 10 The invention is based on the finding that the
Strands, i. the strand beginning and strand end being colder than the intervening strand (hereinafter also referred to as strand main part) which is continuously cast at nominal casting conditions. This is mainly due to the reduced casting speed at the casting start and casting end. In addition, heat is transferred via the cold strand or through the water, which in addition to the strand end or the strand board, i. the end face of the end of the string, passes, discharged. Because of the lower temperature, the 20 strands i.A. completely solidified. If these two cold and solidified strands are transported through the machine, it can be bent especially in the bending and straightening zone (ie in the zones where the strand is bent from the vertical into the arched form or the horizontal is bent back from the arched form in FIG. 25). too much increased
Rolling forces come, which are caused by the contact of individual (or at least less) roles with these strand parts (instead of a contact of several roles in one area, so that there is a division of forces). The 30 roller forces can be far above the maximum permissible values of the roller bearings and thus lead to damage of the rollers or the roller position.
According to the invention, after the insertion of the dummy bar, the holding of the dummy bar and the casting, the
Continuous casting machine, the position of the cold rod head or, the Stranganfangs - which is opposite the cold strand head - when pulling out the dummy strand (or, the strand, since the strand 05/12/2011 12:08
No .: R890 P.008 / 032 Dec. 5, 2011 12:06 pm 201123825
Siemens CIO P
No. 4368 p. 9 6 * * • * · * • # · ··· * μ ** «· · · · · ·« * «I« * # · · I I · · »< *************************************************************************************************************************************************************************************************************************************************** After the strand beginning, or preferably the upper end of the strand start region having a length of length A, 0.5 < A < 5 m, has passed a pair of engagable strand guide rollers, the pair is hitched to the strand so that the pair touches the strand. Furthermore, the strand start region is cooled less by a cooling nozzle than the 10 strand main part, which adjoins the strand start region; Specifically, the strand start region is provided with a coolant amount Q < Qm * ™ and the strand main body with a coolant amount Q * Q when cooled. Thus, the strand beginning is softer in the language of the skilled artisan than the 15 strand main part. As a result, the temperature of the strand start region corresponds more closely to the temperature of the strand main part, which is poured continuously at nominal casting conditions. Preferably, only after the strand beginning has a distance of typically several meters 20 in the casting direction from a pair of opposed strand guide rollers, the pair of opposite strand guide rollers on the strand and the strand through at least one cooling nozzle in the region of the pair of employed strand guide roller 25 of the nominal coolant quantity cooled. The fact that at the casting start the actual casting gap between the strand guide rollers and the strand - not as technically common - is applied directly to Stranganfang, but only a few meters after the Stranganfang, it is avoided that there is an undesirable contact of the rollers with the
Cold strand comes or the Soft Reduction is not applied to the cold and therefore very hard Stranganfangsbereich. Since thus the strand guide rollers do not touch the strand start region, on the one hand the further cooling of the strand 35 by the typically cooled rolls is avoided; On the other hand, damage to the rollers is prevented by the strand starting area preventively and reliably. 05/12/2011 12:08
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Siemens CIC P
No. 4368 p. 10 7 • ··· * * · * »· * • ·· ♦ • · • · · · · ♦» · p * «« «
In this application, under a deployable strand guide roll, both a singular engageable strand guide roll (see, for example, WO2011 / 095383), a strand guide roll of a strand guide segment set by the skew of the clamping cylinders of the segment, or a strand guide roll represented by a {see, e.g. W001 / 94051) or two adjusting cylinder is hitched to the strand understood. Preferably, the rated refrigerant quantity is £ (*, "" Of the
Casting speed, the strand age or particularly preferably dependent on the location-dependent strand temperature. For a casting speed-dependent amount of coolant, Q # * is smaller at a low casting speed than at a higher casting speed. For a nominal coolant quantity QNeJm which depends on the strand temperature, the strand temperature can be determined either by measurement (for example by means of a pyrometer) or by online simulation of the strand temperature (for example by the Dynacs or Dynacs 3D software package) 20.
It is advantageous that the amount of coolant Q discharged from the cooling nozzle onto the strand start region is increased as a function of a distance between the strand inlet and the cooling nozzle, wherein Q.sub.2 increasing the coolant quantity causes the temperature of the strand start region to be reasonably uniform is adapted to the temperature of the strand main body, which is poured continuously at nominal casting conditions. The increase in the amount of coolant can be done either continuously or in discrete steps. The distance should be understood as the difference between the so-called metallurgical lengths. In order to avoid in particular segregations in the strand, it is advantageous if the strand is reduced in its thickness by the employment of the pair of engagable strand guide rollers to the strand. 05/12/2011 12:09
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, 2011 12:07 Siemens CIC P
No. 4368 p. 11 201123825 9 · · · · ··· ♦ «· 99 • 9« · · «« • • • • # • * ψ 9 • • »· * 9 * • • ♦ • i «» »·· * · ** 9 m · ♦ 5 10 15 20 25 30
It is particularly advantageous if the strand has a liquid core in the reduction of its thickness. This will cause u.A. also reduced the forces in the reduction. The task according to the invention is likewise achieved by a method according to claim 5. Advantageous effects of the invention are the subject of the dependent claims. Claim 5 relates to a method for operating a continuous casting at Gießende of the aforementioned type, with the additional steps of: - detecting a position of the strand end in the strand guide; before the strand end, preferably a lower end of the strand area, has passed through the pair of engageable strand guide rolls: retracting the pair of adjoining strand guide rolls such that the pair does not contact the strand; Cooling the strand main body with Q * ώ # ηη / wherein the cooling nozzle applies a coolant amount Q substantially equal to a rated coolant amount to the strand area; Cooling the strand area with Q < CW ". wherein the cooling nozzle has a coolant amount Q < ftu .. on the strand area; Cooling of the end of the stream with Q i Ώμιμ, wherein the Kahldüse a quantity of coolant Q ^ 0 «» ** auszustingt on the strand end. By introducing the pouring end, a strand end is formed in the mold, followed by a strand region with a length B and a strand main part in the casting direction. At least after the pouring end has been introduced and the supply of liquid steel into the mold, e.g. has been stopped by closing a distributor plug, in turn, the position of the string end in the strand guide is detected. To avoid damaging a pair of adjustable strand guide rollers, the pair of engagable strand guide rollers will become the strand end, 05/12/2011 12:09
No .: R890 P.011 / 032 35 Dec. 5, 201 1 1 2:07 Siemens CIO P No.4368 p. 12 201123825
preferably before a lower end of the strand area the pair has passed is withdrawn from the strand so that the two strand guide rolls no longer touch the strand (positively stated, this means that both strand guide rolls are spaced from the surface of the strand) Substantially cooled with the rated coolant amount QNan, the throat region is cooled with a coolant amount Q <Quenn and the end of the strand is cooled with a coolant amount Q 2 Q)) 10. Weaker cooling of the strand area tends to adjust the temperature of this area to the temperature of the strand body, improving the quality. By strongly cooling the end of the string, it is ensured that the strand plate solidifies completely, so that no liquid metal can escape. For many types of steel it is sufficient to use the strong cooling of the end of the stream only in the first cooling zones (for example, the cooling zones 1 to 3 immediately after the mold) 20
It is advantageous if, during cooling of the strand region, the amount of coolant Q discharged from the cooling nozzle is reduced as a function of a distance between the strand end and the cooling nozzle, where 0 < Q < QBenn,
To get a "spill-out" At the end of pouring, it is advantageous if, during cooling of the end of the string, the cooling nozzle applies a maximum amount of coolant Q e Qm x to strand 30. As a result, the end plate - at least in the first three cooling zones of the strand guide - is subjected to the maximum water flow rate, so that a "spill-out". reliably prevented. In order to reduce the water consumption or to prevent the unwanted cooling of the strand by dripping cooling water, it is advantageous to stop the cooling by the cooling nozzle after the strand end has passed the cooling nozzle. 05/12/2011 12:09
No .: R890 P.012 / 032 105th Dec, 2011 12:08 201123Θ25
Siemens CIC P
No. 4368 p. 13 * ** · »* i *
The object of the invention is also achieved by a method according to claim 9. Advantageous effects of the invention are the subject of the dependent claims. 5
Claim 9 relates to a method for operating a continuous casting machine in a temporary slowdown of the casting operation of the type mentioned, with the additional steps of: 10 - detecting the positions of a lower end and an upper end of the transition piece in the strand guide; before the lower end of the transition piece has passed the pair of engagable strand guide rollers: 2 retracting the pair of engagable strand guide rollers from the strand, 15 so that the pair does not contact the transition piece; after the upper end of the transition piece has passed the pair of engagable strand guide rollers: adjusting the pair of engageable strand guide rollers to the strand so that the pair contacts the strand; 20 - cooling a strand main body with Q * Qw / where the cooling nozzle applies a coolant quantity Q substantially equal to a nominal coolant amount to the strand main body; Cooling the transition piece with Q < Ομιμγ wherein the cooling nozzle has a coolant quantity Q < Ονμλ on the 25th transition piece
By reducing the amount of liquid steel fed in and reducing the pullout pullout speed due to the continuity, a so-called transition piece is formed in the strand, which is considerably colder than that
Strand body is. Damage to the strand guide is prevented by retracting a pair of engageable strand guide rollers prior to passing the transition piece such that the strand guide rollers do not contact the transition piece. After passing the transition piece, the pair is put back on the strand so that the rolls of the pair touch the strand. By making the transition piece less strong ("softer") 05/12/2011 12:10
No .: R890 P.013 / 032 5. De :. 2011 12:08 201123825
Siemens CIO P
No. 4368 p. 14 11 • «4» · When the main part of the strand is cooled, the temperatures of the transition piece and the strand main part are at least partially adjusted. This increases the quality of the transition piece. 5
Brief description of the drawings
Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the following figures, which show the following;
1 shows a schematic representation of the method according to the invention during casting start, wherein the different phases 15 are shown in the subfigures la to ld;
Figure 2 is a schematic representation of the method according to the invention at the end of casting, wherein the phases are shown in the subfigures 2a to 2f; 20
3 shows a schematic representation of the cooling quantity distribution in a strand start region;
4 shows a schematic representation of the cooling quantity distribution 25 in a strand region; and
Fig S is a schematic representation of the method according to the invention in a temporary slowing down of the casting operation, the phases in the subfigures 5a to 2f 30 are shown.
Description of the embodiments
FIG. 1 shows the method according to the invention for the operation 35 of a continuous casting machine at casting start, wherein the
Process steps are shown in detail in the subfigures la to ld. The continuous casting machine 1 is in this case as a vertical continuous casting machine with a cooled 05/12/2011 12:10
No .: R890 P. 014/032 Dec 5, 2011 12:08 pm 201123825
Siemens CIC P
No, 4368 p. 15 12
* * 4M • «« »« 444 * · ** Φ * · »
Run through mold 3 executed, which is designed for the continuous casting of liquid steel to a strand 2 with billet or Vorblockprofilquerschnitt. The strand guide 4 has a plurality of pairs of strand guide rollers 5, which can be set against one another on the strand 2 5, and a plurality of cooling nozzles 10. In the continuous casting operation liquid steel is introduced by means of a dip tube, not shown, in the mold 3, where the molten steel is cooled by a so-called primary cooling and thereby forming a teilerstarrter 10 strand 2 with a thin strand shell.
Fig la shows the situation before the casting start, which is referred to in this application as casting start. After a cold strand € has been introduced from above into the mold 3, the cold strand 6 is held in the strand guide 4, for example by drivable strand guide rollers 8, so that the head of the cold strand (the cold strand head 7) closes the mold fluid-tight. Fig. 1b shows the situation when casting the
Continuous casting machine 1. A casting distributor, not shown, fills molten steel over a dip tube {eng. SEN) into the mold 3, wherein in the mold a pouring level (the so-called meniscus 15) sets in. By cooling the melt in the mold 3, a partially solidified strand 2 forms, comprising a strand beginning 16, a strand starting region 17 a length A, and a strand main part 20. At the contact surface between the cold strand head 7 and the strand 2, the strand strand 16 forms, which is welded to the cold strands head 7. Contrary to the casting direction 9, the strand starting region 17 follows the strand beginning 16, and the strand main section 20 follows the strand start region 17. The strand 2 which is at least partially solidified is pulled out of the mold 35 and further cooled by means of the secondary cooling cooling nozzles 10. In this embodiment, the strand starting region has a length A of 3 m. 2011 12:11
No .: R890 P.015 / 032 13 5.Dec. 2011 12:09 201123825
Siemens CIO P
No. 4368 p. 16 • * · · * · »·:; • · 4 m m * 44 4 • «* • * 4 > * · +
FIG. 1 c shows the situation when the cold strand 6 is pulled out of the mold 3. The casting mirror 15 in the mold is kept approximately constant by the supply of molten steel, so that the cold strand 5 6 - which is connected to the strand 2 - is pulled out in the casting direction 9 is - is ausge¬ out of the mold by the drivable strand guide rollers 8. It is crucial for the further method steps that the position of the cold strand head 7 or the position of the strand start 16 in the strand guide 10 is detected. This is done e.g. by a rotary encoder, which is connected to a hired, driven strand guide roller 8. Of course, the person skilled in the art also knows of other ways in which the position of the cold rod head is detected or "tracked". can be. After the strand beginning 15 16 has passed a pair of engageable strand guide rollers 5, the pair 5 of the opposite strand guide rollers is employed on the strand 2. In the case of FIG. 1c this is concretely the case with the two upper strand guide rollers 5, the employment of which has been indicated on the strand 2 by an arrow. In addition, it can be seen in this figure that the uppermost pair of cooling nozzles 10 has a reduced amount of coolant Q < Qsenn the cooling medium haters on the strand starting area 17 brings. The reduced amount of refrigerant is represented by a thin stream of coolant in the figures. Of the
Strangergfangsbereich 17 is defined by the strand beginning 16 and by the length A.
FIG. 1 d shows a further situation during casting start, wherein the strand 2 has been pulled further out of the mold 3.
Specifically, the strand beginning 16 has passed the two top pairs of strand guide rollers 5, so that both pairs are employed on the strand 2. The strand starting region 17 with a length of A = 3 m, which is cooled with a reduced amount of coolant, is also shown.
The uppermost cooling nozzle 10 is already outside the strand start region 17, so that the strand main part 20 of the strand 2 with the nominal coolant quantity smoke »in the concrete 05/12/2011 12:11
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Case depends on the casting speed, is cooled. The output of the nominal coolant quantity is shown in the figures by a wide coolant jet. 5 According to an alternative method, the engageable strand guide rollers 5 are not placed on the strand immediately after passing the strand edge 16, but only after the upper end 17a has passed the rolls 5 or the strand edge 16 has reached a position that is the strand guide roll 5 is downstream by a certain distance A.
According to another method, the amount of coolant 15 Q discharged from the cooling nozzle 10 to the strand start region 17 is increased in response to a distance 11 between the strand start 16 and the cooling nozzle 10, where 0 < Q < Ow ,. Thus, the strand beginning 16 and the strand starting regions 17 is less cooled than the subsequent strand main piece 20, wherein the amount of coolant Q is increased continuously or discretely 20 on Qi, ™.
3 shows how the quantity of coolant Q discharged from a cooling nozzle 10 onto the strand starting region 17 of length A is increased by the distance x (in FIG. 1d, where x is opposite to the casting direction 9) between the strand beginning 16 and the cooling nozzle , The solid line indicates a cooling amount distribution, and the refrigerant amount Q is given by the equation Q = ^ ss-x. In contrast, 30 follows the coolant quantity distribution corresponding to the dashed line
Line of the equation Q = _ Qmn ~ Qi • Afti x + ÖU, 'where a minimum amount of coolant for the Stxanganfang 16 indicates.
Figure 2 with the subfigures 2a to 2f show the 35 process steps at the end of casting also for 05/12/2011 12:11
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No. 4368 p. 18 201123825 15 * * * ··· * * Φ · * t «* · < * ft »f | I; 1 · · «« ·· ··· Mil · ♦, #
Vertical continuous casting machine for the production of long products according to FIG. 1.
FIG. 2a shows the continuous operation of the continuous casting machine 1, wherein all the strand guide rollers 5, 8 of the strand guide are placed against the strand 2 and the strand 2 is cooled by the cooling nozzles 10 with the nominal coolant quantity Qi (represented by a wide coolant jet). 10
FIG. 2b shows the stopping of the supply of liquid steel into the mold 3, as a result of which the pouring level or the meniscus 15 decreases somewhat with respect to the stationary position of FIG.
By cooling the molten steel in the mold 15 forms a strand end 18, on the 9 in the casting direction
Stranggendbereich 19 with a length B, for example, 3 m, and the strand main part 20 follows with an indefinite length. The strand 2 is further pulled out in the casting direction 9 from the mold 3, wherein the position of the string end 18 in the strand guide 4 is detected. Since the uppermost cooling nozzles are outside the strand area 19, the cooling nozzles 10 still apply the nominal coolant quantity Qm * ™ to strand 2. Fig. 2c shows a position of the strand 2 where, just before the lower end of the strand portion 19a has passed the uppermost pair of engagable strand guide rollers 5, the pair is withdrawn from the strand 2 so that the pair does not touch the strand region, i. that the rollers of the 30 pair have a distance transversely to the casting direction 9 to the strand. Withdrawal is indicated by an arrow.
FIG. 2d shows another position of the strand 2, wherein the strand section 19 is separated from the uppermost cooling nozzles 10 with a reduced coolant quantity Q < Qmmü is cooled. 05/12/2011 12:12
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FIG. 2e shows a further position of the strand 2 at the casting end, with the uppermost two pairs of strand guide rolls 5 being withdrawn from the strand. The second row of the cooling nozzles 10 cools the strand region 19 5 again with a reduced amount of coolant. However, after the strand end 18 has already reached a position at which the cooling region of the uppermost row of cooling nozzles 10 already detects the strand end, the stranding with the maximum coolant quantity Q - GW, * is cooled. 10
Finally, FIG. 2f shows the case in which the strand end 18 has already passed the uppermost row of cooling nozzles 10, so that the cooling by these cooling nozzles 10 is ended. In the position shown, the third row of 15 engageable rollers 5 is withdrawn from strand 2.
Also, in the casting end process, it is possible that, when cooling the strand portion 19, the amount of coolant Q discharged from a cooling nozzle 10 is reduced depending on a distance 11 between the strand end 13 and the cooling nozzle 10, where 0 < Q < Qmm "·
FIG. 4 shows how the quantity of coolant Q discharged from a cooling nozzle 10 onto the strand region 19 having a length B and to the strand end 25 18 having a length B is shown in FIG
Distance y (see FIG. 2f, where y extends in the casting direction 9) is set between the strand end 18 and the cooling nozzle 10. The solid line indicates a cooling amount distribution, and for the distance 0 < y < E is the amount of coolant Q * 30 Qh, x and for the distance E < y < B is the amount of coolant given by the equation Q = - y. In contrast
Qthm 2 is the coolant quantity distribution corresponding to the dashed line for the distance 0 < y < E with Q = Qnmm and B-E 'for the distance E < y < B is given by the equation Q-35. 05/12/2011 12:12
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17
FIG. 5 shows the method for operating the continuous casting plant according to FIG. 1 during a temporary deceleration of the casting operation. Fig. 5a shows the continuous operation of
Continuous casting machine, wherein in a mold 3 liquid steel is poured into a partially solid strand 2 with billet profile. The strand is guided in the strand guide 4 by the employed strand guide rollers 5 and cooled by the 10 cooling nozzles 10 with cooling water. In this case, the strand 2 is continuously pulled out at a Auszμgsgeschwindigkeit Vh «« by the drivable strand guide rollers 8 in the casting direction 9 from the mold. Fig. 5b shows the situation in the reduction of the supply rate of liquid steel into the mold 3. By withdrawing the amount of steel introduced into the mold 3 2, the meniscus 15 drops slightly. At the same time, immediately after the reduction, the pullout pullout speed v is also reduced, so that v < vIf it is. By reducing the flow rate of steel into the mold 3 and the reduction of the withdrawal speed v, the formation of a transition piece 21 is initiated, wherein in Fig. 5b, the lower end 21a of the transition piece is formed. 25
In Fig. 5c, the reduced inflow rate and the reduced pull-out speed v of Fig. 5b are maintained, whereby the transition piece 21 is further formed. The transition piece in the casting direction 9 subsequent strand part 30 is referred to as the lower strand HauptstUck 20a.
In FIG. 5 d, the continuous nominal operation of the continuous casting machine 1 is restored, with the inflow rate and the pullout pullout speed being increased again to the nominal values 35. In this case, the upper end 21 b of the transition piece 21 is formed, whereby the formation of the intermediate piece 21 is terminated. 05/12/2011 12:12
No .: R890 P.020 / 032 185. Dec. 2011 12:10 201123825
Siemens CIC P
No. 4368 p. 21
The positions of the upper 21b and lower end 21a of the transition piece 21 are e.g. detected by the driven strand guide rollers 8, so that their positions for the subsequent position of the engageable S strand guide rollers 5 and the cooling nozzles 10 can be used.
Fig. 5e shows how the strand 2 with the lower strand main piece 20a, the transition piece 21 and the upper 10 strand main piece 20b, which follows the transition piece, is pulled out of the mold 3 with vm ^ ». The top pair of strand guide rollers 5 is immediately before the lower end 21a of the transition piece 21 passes the pair 5, withdrawn from the strand 2 (shown by arrows), so that the rollers 15 of the pair 5 do not touch the transition piece 21. Thus, the transition piece 21 by the cooled strand guide rollers 5 less cooled than the strand main pieces 20a, 20b. The uppermost pair of cooling nozzles 10 cools the lower strand main piece 20a of the strand 2 with a quantity of coolant Q = Qmm.
FIG. 5f shows a further situation in the production of the transition piece 21. The strand 2 is pulled further out, with the uppermost pair of strand guiding rolls being brought back to the strand 2 or the upper strand main part 20b. Also, the second pair of strand guide rolls has already undergone this sequence of strand withdrawal and reinstatement to the strand. Also, the uppermost pair of cooling nozzles 10 has undergone a sequence in which the lower 30 and upper strand main pieces 20a, 20b have Q - Qmm and the intermediate transition piece 21 has Q < Qm ™ has been cooled. In the figure, a reduced amount of coolant is represented by a thinner coolant jet. The third pair of rollers 5 has been withdrawn from the strand before the lower end 21 a of the transition piece 21 passes the rollers, so that the rollers do not touch the transition piece 21. In Fig 5f, the transition piece 21 through the 05/12/2011 12:13
No .: R890 P.021 / 032 195. Dec. 2011 12:11 201123825
Siemens CIC P
No. 4368 p. 22, second pair of cooling nozzles 10 having a coolant amount Q < Qn «in the cool.
Thus, the engageable strand guide rollers 5 5 are moved according to the position of the transition piece 21, so that the rollers do not touch the transition piece 21. The retraction may be either immediately prior to passing the lower end 21a, or already done a few meters before actually passing. Similarly, the adjustment of the pair of rollers 5 may occur either immediately after passing the top end 21b of the transition piece or only a few meters after actually passing the transition piece 21, 15. Although the invention has been illustrated in the embodiments for a vertical continuous casting machine the invention is by no means limited thereto. Rather, it is fully applicable to vertical, bow and horizontal casters. However, in sheetfed machines, it should be noted that the distance between two elements (e.g., a strand end and a cooling nozzle) is given by the arc length of a neutral strand fiber between these elements. Although the invention is described in detail by the preferred
As the embodiments have been further illustrated and described, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. 05/12/2011 12:13
No .: R890 P.022 / 032 Dec. 5, 2011 12:11 201123825
Siemens CIO P
No. 4368 p. 23 20 »* * * • m *» · *
List 1 2 3 4 5 6 7 8 9 10 11 15 16 17 17a 18 19 19a 20 20a 20b 21 21a 21b A Q Onerm Önin Oku the reference numeral
continuous casting
strand
mold
Strand guide adjustable strand guide roller
dummy bar
Cold strand head drivable strand guide roller
Casting direction cooling nozzle
distance
meniscus
Stranganfang, lower end of the
Strand initial region
Strand start region upper end of the strand start region
strand end
Stranggendbereich lower end of the strand area
Strand body Lower strand body Upper strand body Transition piece Lower end of transition piece Upper end of transition piece Length of coolant Nominal coolant quantity Minimum coolant quantity Maximum coolant quantity Distance 05/12/2011 12:13
No .: R890 P.023 / 032

权利要求:
Claims (10)
[1]
No. 4368 p. 24
[2]
2. The method according to claim 1, characterized in that the from the cooling nozzle (10) on the strand start region (17) discharged coolant quantity Q in response to a distance (11) between the strand beginning (16) and the cooling nozzle (10) 5 is increased.
[3]
3. The method according to claim 1, characterized in that the strand (2) by the employment of the pair of engagable strand guide rollers (5) to the strand (2) in its thickness 10 (12) is reduced.
[4]
4. The method according to claim 3, characterized in that the strand (2) in the reduction of its thickness (12) has a liquid core. 15
[5]
5. A method for operating a continuous casting machine (1) at the end of casting, wherein the continuous casting machine (1) comprises a mold (3) and a Strangftihrung (4), and the strand guide (4) at least a pair of engageable strand guide rollers (5) 20 and at least a cooling nozzle (10), comprising the following method steps: - continuous casting of a strand (2), wherein in the mold (3) liquid steel is poured into an at least partially solidified strand (2); 25 - stop the supply of liquid steel in the mold (3), whereby in the mold (3) a strand end (18) is formed, so that the strand (2) a strand end (18), a subsequent strand region (19) with a Length B, 0.5 < B < 5 m, and subsequently having a strand main part (20); 30 - Extracting the strand (2), wherein the strand (2) in a casting direction (9) is pulled out of the mold (3); - detecting a position of the string end (18) in the strand guide £ 4); - before the strand end (18), preferably a lower end 35 (19a) of the strand area (19), has passed the pair of engageable strand guide rolls (5): retracting the pair of engageable strand guide rolls (5) so that the strand (2 ) not touched; 05/12/2011 12:14 No .: R890 P.025 / 032 No. 4368 p. 26 - Dec. 5, 2011 12:12 Siemens CIO P 201123825 23 ··

Cooling the strand main body (20) with Q »Otons, wherein the cooling nozzle (10) applies a refrigerant amount Q substantially equal to a rated refrigerant amount £ Wn to the strand main body (20); 5 - cooling the strand region (17) with Q < Ο / ™, wherein the cooling nozzle (10) has a coolant amount Q < Apply Qntm to the strand area (17); Cooling the end of the string (18) with Q ^ Qmnnt wherein the cooling nozzle (10) a coolant amount Q £ Öw, nfI on the 10 strand end (18) applies.
Dec 5, 2011 12:11 Siemens CIC P 201123825 21

• * * *> • • • ♦ * · «• * Φ • ··· · Φ • · ·« «< 1. A method for operating a continuous casting machine (1) at casting start, wherein the continuous casting machine (1) comprises a mold (3) 5 and a strand guide (4), and the strand guide ( 4) comprises at least one pair of engageable strand guide rollers (5) and at least one cooling nozzle (10), comprising the following method steps: - introducing a cold strand (6) into the continuous casting machine (1); Holding the cold strand (6) in the strand guide (4), wherein a cold strand head (7) closes the mold (3) in a fluid-tight manner; - Casting the continuous casting machine (1), wherein liquid 15 steel is poured into the mold (3) and thereby an at least partially solid strand (2), a strand beginning (16), a subsequent strand starting region (17) with a length A, 0 , 5 < A < 5 m, and subsequently comprises a strand main part (20) forms; Pulling out the cold strand (6), wherein the cold strand (6) in a casting direction (9) is pulled out of the mold (3); Detecting a position of the strand start (16) in the strand guide (4); 25 - after the strand beginning (16), preferably an upper end (17a) of the strand starting region (17), has passed the pair of engageable strand guiding rolls (5): setting the pair to the strand (2) so that the strand (2 ) touched; 30 - cooling the strand starting region (17) with Q < Ck »». wherein the cooling nozzle (10) applies a coolant amount Q smaller than a rated coolant amount 0 * ηη to the strand start region (17); - Cooling of the strand main part (20) with Q * atom * wherein the cooling nozzle (10) a coolant quantity Q substantially equal ÜMMu on the strand main part (20) ausbringt. 05/12/2011 12:14 No .: R890 P.024 / 032 22 * Dec. 5, 2011 12:12 201123825 Siemens CIO P No. 4368 p. 25 · * ·· «• · • ·« • M ♦ ♦ ♦ ··· ·· * · lf
[6]
6. The method according to claim 5, characterized daaa daaa during cooling of the strand region (19) from the cooling nozzle (10) discharged coolant quantity Q as a function of a distance (11) between the strand end (13) and the cooling nozzle (10) is reduced ,
[7]
7. The method according to claim 5, characterized in that when cooling the string end (18), the cooling nozzle (10) a maximum amount of coolant Q - Qh »x on the strand (2) ausbringt.
[8]
8. The method according to claim 5, characterized in that after the strand end (18) has passed the cooling nozzle (10), the cooling through the cooling nozzle (10) is terminated.
[9]
A method of operating a continuous casting machine (1) in a temporary deceleration of the casting operation, the continuous casting machine (1) comprising a mold (3) and a strand guide (4), and the strand guide (4) comprises at least one pair of engageable strand guiding rollers (3). 5) and at least one cooling nozzle (10), comprising the following method steps: continuous casting of a strand (2), wherein in the mold (3) 35 liquid steel is poured into an at least partially solidified strand (2); * Extract the strand (2) at a speed v, whereby the strand (2) in a casting direction (9) with v in the 05/12/2011 12:14 No .: R890 P.026 / 032 24 4 5. Dec. Siemens CIC P 2011 12:12 201123025 No. 4366 p. 27 M ················································································································································································································· Reducing a supply rate of liquid steel into the mold (3), whereby the formation of a transition piece 5 (21) begins; Extract the strand (2) with v <vMnn; Increasing the rate of supply of liquid steel into the mold (3), whereby the formation of a transition piece (21) is terminated / so that the strand (2) has a lower
[10]
10 strand main part (20a) / a transition piece (21) and an upper strand main part (20b); - Pulling out the strand (2) with v * vH «m; - Detecting the positions of a lower end (2la) and an upper end (21b) of the transition piece (21) in the strand guide (4); before the lower end of the transition piece (21a) has passed the pair of engageable strand guide rollers (5): retracting the pair of engageable strand guide rollers (5) from the strand (2) such that the pair does not contact the transition piece (21); after the upper end (21b) of the transition piece (21) has passed the pair of engagable strand guide rollers (5): setting the pair of engageable strand guide rollers (5) to the strand (2) so that the pair contacts the strand (2); 25 - cooling a strand main body (20a, 20b) with Q «Gwennr, wherein the cooling nozzle (10) applies a coolant amount Q substantially equal to a rated coolant amount Gmnn to the strand main body (20); Cooling the transition piece (21) with Q < Gtunnr wherein the cooling nozzle (10) a coolant quantity Q < Gwenn on the transition piece (21) brings out. 05/12/2011 12:15 No .: R890 P.027 / 032

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法律状态:
2015-07-15| PC| Change of the owner|Owner name: PRIMETALS TECHNOLOGIES AUSTRIA GMBH, AT Effective date: 20150520 |

优先权:

申请号 | 申请日 | 专利标题

ATA1792/2011A|AT512214B1|2011-12-05|2011-12-05|PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE CASTING STAGE, AT THE CASTING END AND AT THE PRODUCTION OF A TRANSITION PIECE|ATA1792/2011A| AT512214B1|2011-12-05|2011-12-05|PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE CASTING STAGE, AT THE CASTING END AND AT THE PRODUCTION OF A TRANSITION PIECE|

KR1020147018831A| KR101984634B1|2011-12-05|2012-11-19|Process engineering measures in a strand casting machine at the beginning of casting, at the end of casting, and during the manufacturing of a transition piece|

EP12798200.7A| EP2788133B1|2011-12-05|2012-11-19|Process engineering measures in a strand casting machine at the beginning of casting, at the end of casting, and during the manufacturing of a transition piece|

CN201280059916.3A| CN103958094B|2011-12-05|2012-11-19|Initial in casting, to cast when terminating and manufacture transition piece in conticaster in technology measure|

US14/361,284| US9254520B2|2011-12-05|2012-11-19|Process engineering measures in a continuous casting machine at the start of casting, at the end of casting and when producing a transitional piece|

PCT/EP2012/072959| WO2013083391A1|2011-12-05|2012-11-19|Process engineering measures in a strand casting machine at the beginning of casting, at the end of casting, and during the manufacturing of a transition piece|

RU2012152085A| RU2620320C2|2011-12-05|2012-12-04|Technological measures in continuous caster in the beginning of casting, in the end and during production of transition point|

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