CN102773427B - Continuous casting device and method of large-section round billet - Google Patents

Continuous casting device and method of large-section round billet Download PDF

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Publication number
CN102773427B
CN102773427B CN201210193677.2A CN201210193677A CN102773427B CN 102773427 B CN102773427 B CN 102773427B CN 201210193677 A CN201210193677 A CN 201210193677A CN 102773427 B CN102773427 B CN 102773427B
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crystallizer
water
interior crystallizer
continuous casting
base
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CN102773427A (en
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周守航
耿明山
黄衍林
张西鹏
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MCC Capital Engineering and Research Incorporation Ltd
Zhongye Jingcheng Engineering Technology Co Ltd
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Zhongye Jingcheng Engineering Technology Co Ltd
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Abstract

The invention discloses a continuous casting device and a continuous casting method of a large-section round billet. The device comprises an inner crystallizer, an outer crystallizer, an upper cover mechanism, a base mechanism, a cylindrical ingot guider with a solid round section, a tundish with a heating function and a cast flow distributor, wherein the base mechanism and the inner part of the upper cover mechanism are communicated with each other and fixed from top to bottom; the outer crystallizer is fixed below the base mechanism; the inner crystallizer is of an inverted arrow-shaped structure and is fixedly connected to the upper cover mechanism; the lower side of the inner crystallizer is inserted into the upper cover mechanism and the base mechanism, so that the lower part of the inner crystallizer is arranged at the inner side of the outer crystallizer and concentrically surrounded by the outer crystallizer; the cast flow distributor distributes metal solution in the tundish into one or more paths and guides the metal solution into the upper cover mechanism; the metal solution is filled between the inner crystallizer and the outer crystallizer; in the primary stage of casting, the cylindrical ingot guider is arranged at the bottom of a round cavity below the outer crystallizer; the metal solution is cooled by the inner crystallizer and the outer crystallizer to form a solidified round billet; and the round billet is arranged on the cylindrical ingot guider.

Description

The continuous casting apparatus of big cross section circle base and casting method thereof
Technical field
The invention relates to continuous casting apparatus and the casting method thereof of a kind of big cross section circle base.
Background technology
Along with the development of the industries such as oil, chemical industry, wind-powered electricity generation, nuclear power, large diameter tubular blank, tubular blank, annular blank and big cross section high-quality solid ingot blank demand constantly increase, tradition ingot casting forging punching, counter-boring techniques cannot meet the demand of quality, efficiency, cost, along with the increasing of casting section diameter, center porosity, shrinkage cavity, segregation worsen, the low inferior development that seriously govern the sector of yield rate low (50-65%), production efficiency.
And cast technology continuously, owing to being subject to the impact of big cross section heat transfer, Inner Quality of Billet and production efficiency also significantly reduce with the increasing of cross section diameter, even if liquid core soft reduction technique is along with the further increase of diameter, round billet surface deformation becomes more and more weak to the transmission at center, so that the solid continuous casting billet of more than diameter 1000mm has become continuous casting to be difficult to the forbidden zone gone beyond.
Summary of the invention
The object of the invention is, provide continuous casting apparatus and the casting method thereof of a kind of big cross section circle base, it can be applicable to the manufacture of the solid strand of large gauge.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
A continuous casting apparatus for big cross section circle base, described casting device comprises interior crystallizer, outer crystallizer, cap sheathing mechanism, foundation means, and section is the cylindrical dummy ingot of solid round shape, the tundish of band heating and casting fluidic distributor; The inside of foundation means and cap sheathing mechanism is interconnected, and cap sheathing mechanism is fixedly connected with up and down with foundation means; Outer crystallizer is fixedly connected on the below of described foundation means; Described interior crystallizer is inverted rocket head-like structure, interior crystallizer is fixedly connected on cap sheathing mechanism, and the below of interior crystallizer is arranged in the inside of cap sheathing mechanism and foundation means, the bottom of described interior crystallizer is made to be positioned at the inner side of outer crystallizer, and put by the winding of outer crystallizer concentric ring, molten metal in tundish is assigned as in first-class or multithread importing cap sheathing mechanism by described casting fluidic distributor, is filled with molten metal between described interior crystallizer and outer crystallizer; Opening the initial stage of watering, described cylindrical dummy ingot is arranged on bottom the circular cavity below outer crystallizer, and described molten metal forms through the cooling of inside and outside crystallizer the round base solidified, and described round base is positioned on cylindrical dummy ingot.
A continuous casing for big cross section circle base, it comprises step:
A, provide interior crystallizer, outer crystallizer, cap sheathing mechanism and foundation means; The inside of foundation means and cap sheathing mechanism is interconnected, and cap sheathing mechanism is fixedly connected with up and down with foundation means; Outer crystallizer is fixedly connected on the below of described foundation means; Interior crystallizer is inverted rocket head-like structure, interior crystallizer is fixedly connected on described cap sheathing mechanism, and the below of interior crystallizer is arranged in the inside of described cap sheathing mechanism and foundation means, make the bottom of described interior crystallizer be positioned at the inner side of described outer crystallizer, and put by the winding of described outer crystallizer concentric ring;
B, the cylindrical dummy ingot providing section to be solid round shape and lifting push rod, lifting push rod is connected to the bottom of cylindrical dummy ingot, and drives dummy ingot to move up and down, and described cylindrical dummy ingot is arranged on the cavity bottom below described outer crystallizer;
C, molten metal is introduced in cap sheathing mechanism, and then make molten metal be filled between described interior crystallizer and outer crystallizer, molten metal forms base shell through the two-way cooling of interior crystallizer and outer crystallizer, be elevated push rod drives cylindrical dummy ingot to move downward simultaneously, makes to produce relative motion periodically up and down between base shell and inside and outside crystallizer simultaneously; Relative motion up and down between base shell and interior crystallizer plays to base shell the effect of making firm by ramming, the relative motion up and down between base shell and outer crystallizer, plays the effect that the outer surface of base shell and outer crystallizer shell;
D, progressive additive along with base shell, form the round base solidified.
Feature and the advantage of the embodiment of the present invention are: it adopts interior crystallizer to combine with outer crystallizer, two-way cooling is carried out to strand, make slab cooling and solidify adaptable useful area greatly to increase, thus the solid strand of large gauge can be applicable to, in addition, the embodiment of the present invention also can realize continuously and semi-continuous casting.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure section schematic diagram of the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention;
Fig. 2 is the assembling process schematic diagram of the continuous casting apparatus conticaster parts of the big cross section circle base of the embodiment of the present invention;
Fig. 3 is the structural representation of the interior crystallizer of the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention;
Fig. 4 is to show the close-up schematic view of outer crystallizer in the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention;
Fig. 5 is to show the close-up schematic view of the second water-cooling system in the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention;
Fig. 6 is the elevational schematic view of the cap sheathing mechanism of the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention;
Fig. 7 is the A-O-A line generalized section along Fig. 6;
Fig. 8 is the elevational schematic view of the foundation means of the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention;
Fig. 9 is the B-O-O1-B line generalized section along Fig. 8;
Figure 10 is the large section continuous casting core shrinkage porosite bonding processes schematic diagram of the continuous casting apparatus of the big cross section circle base of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
As depicted in figs. 1 and 2, the continuous casting apparatus of the big cross section circle base that the embodiment of the present invention proposes, it comprises interior crystallizer 1, outer crystallizer 2, cap sheathing mechanism 5, foundation means 6, and section is the cylindrical dummy ingot 10 of solid round shape, the tundish 7 of band heating and casting fluidic distributor 8.The inside of described cap sheathing mechanism 5 and foundation means 6 is interconnected, and cap sheathing mechanism 5 is fixedly connected with foundation means about 6, and constitutes endless metal liquid molten bath 3.Described outer crystallizer 2 is fixedly connected on the below of foundation means 6; Described interior crystallizer 1 is inverted rocket head-like structure, interior crystallizer 1 is fixedly connected on cap sheathing mechanism 5, and the below of interior crystallizer 1 is arranged in the inside of cap sheathing mechanism 5 and foundation means 6, the bottom of described interior crystallizer 1 is made to be positioned at the inner side of described outer crystallizer 2, and put by the winding of outer crystallizer 2 concentric ring, molten metal in tundish 7 is assigned as in first-class or multithread importing cap sheathing mechanism 5 by casting fluidic distributor 8, is filled with molten metal between described inside and outside crystallizer 1,2.Opening the initial stage of watering, described cylindrical dummy ingot 10 is arranged on bottom the circular cavity below outer crystallizer 2, and described molten metal forms through the cooling of inside and outside crystallizer 1,2 the round base 4 solidified, and described round base 4 is positioned on cylindrical dummy ingot 10.
Wherein, interior crystallizer 1 refers to for inverted rocket head structure, and interior crystallizer 1 has columned body, is obtuse circular cone head at the head of body.
In the present embodiment, the bottom of interior crystallizer 1 is arranged on the medial center place of outer crystallizer 2, molten metal is filled with between interior crystallizer 1 and outer crystallizer 2, namely, molten metal is implemented two-way cooling by two crystallizers between interior crystallizer 1 and outer crystallizer 2, is drawn out after cooling with the round base 4 solidified from the below of two crystallizers.Furthermore, the present embodiment adopts interior crystallizer 1 to combine with outer crystallizer 2, carries out two-way cooling to circle base 4, and making circle base 4 cool and solidify adaptable effective thickness increases greatly, thus can be applicable to the manufacture of the round base of more large gauge.
In the present embodiment, above-mentioned interior crystallizer 1 and outer crystallizer 2 are fixed together by cap sheathing mechanism 5 and foundation means 6, inside and outside crystallizer is fixed with this, arranges with one heart, so make the replacing of each parts become and are more prone to convenient.In addition, the whole rocket head crystallizer of the present embodiment is soaked among molten metal, constitutes solid strand below crystallizer, can be produced the solid strand of different section by the rocket head changing different-diameter and cone angle.
Shown in Figure 3, described interior crystallizer 1 comprises into water straight catheter 1h, backwater conduit 1i and chilled(cooling) water return (CWR).Backwater conduit 1i compartment of terrain is around in outside described water inlet straight catheter 1h, described backwater conduit 1i comprises the backwater straight catheter 1j and interior crystallizer overcoat 1k that connect up and down, described interior crystallizer overcoat 1k is V-shaped, and the outside of described backwater conduit 1i is coated with the first collet 1g; Chilled(cooling) water return (CWR) is arranged on the inside of described interior crystallizer 1.
Described chilled(cooling) water return (CWR) comprises into water loop 1a, water return loop 1b and water hole 1c.Described water inlet loop 1a is positioned at described water inlet straight catheter 1h, and the upper end of described water inlet loop 1a is water inlet 1d; Gap between described water inlet straight catheter 1h and backwater conduit 1i forms described water return loop 1b, and the upper end of described water return loop 1b is water return outlet 1e; Water hole 1c is arranged between the lower end of described water inlet straight catheter 1h and described interior crystallizer overcoat 1k, and described water inlet loop 1a is connected by water hole 1c with water return loop 1b.
See Fig. 3 the direction of arrow shown in, cooling water enters into water loop 1a from water inlet 1d, then flows into water return loop 1b by water hole 1c, then flows out from water return outlet 1e.Wherein, water inlet 1d and water return outlet 1e is all positioned at the upper end of interior crystallizer 1, and water hole is positioned at the lower end of interior crystallizer 1, and cooling water like this flows in interior crystallizer 1, can cool the molten metal near the interior crystallizer 1 in annular molten metal bath 3 fully.
Described first collet 1g comprises high-temperature flame-proof pipe 1m and high strength graphite 1n, and described high-temperature flame-proof pipe 1m is coated on the outside of described backwater straight catheter 1j, the outside of the coated described interior crystallizer overcoat 1k of described high strength graphite 1n.In the present embodiment; enclose high-temperature flame-proof pipe 1m outside backwater straight catheter 1j molten metal overheated for external high temperature and backwater straight catheter 1j are separated; high strength graphite 1n is located in outside interior crystallizer overcoat 1k, interior crystallizer overcoat 1k and molten metal is separated and plays the effect that interior crystallizer is protected in heat transfer simultaneously.
The top of described interior crystallizer 1 has interior crystallizer flange 1f, described interior crystallizer 1 is fixed on described cap sheathing mechanism 5 by described interior crystallizer flange 1f, namely, position in interior crystallizer 1 below interior crystallizer flange 1f position is in endless metal liquid molten bath 3, and the position above interior crystallizer flange 1f position is in outside endless metal liquid molten bath 3.
Described backwater conduit 1i also comprises backwater and emits conduit 1p, described backwater emits conduit 1p compartment of terrain to be set in the outside of described water inlet straight catheter, and be connected to the top of backwater straight catheter 1j, described backwater emits the gap between conduit with water inlet straight catheter to be connected with described water return loop, described water return outlet 1e is arranged on backwater and emits on conduit 1p, and described interior crystallizer flange 1f is positioned at the top of described backwater straight catheter 1j.Wherein, described backwater emits conduit 1p to be directly directly connected with backwater straight catheter 1j, such as, weld; Or as shown in Figure 6, backwater emits the lower end of conduit 1p to connect backwater and emits flange 1q, and backwater emits flange 1q and interior crystallizer flange 1f to be connected, and then makes backwater emit conduit 1p to be connected with backwater straight catheter 1j.
Coordinate shown in Fig. 1 and Fig. 4, described outer crystallizer 2 comprises from outside to inside spaced outer crystallizer overcoat 2a, outer crystallizer inner sleeve 2b and crystallizer copper pipe 2c successively, the division board 2d laterally placed is connected with between described outer crystallizer inner sleeve 2b and outer crystallizer overcoat 2a, the medial extremity of described division board 2d connects outer crystallizer inner sleeve 2b, outboard end connects outer crystallizer overcoat 2a, division board 2d can be positioned at outer crystallizer inner sleeve 2b on the centre position of short transverse; Described outer crystallizer inside and outside cover has magnetic stirrer 2e between 2b, 2a, described magnetic stirrer 2e is positioned at the top of described division board 2d; Described outer crystallizer overcoat 2a is respectively equipped with water inlet 2f and delivery port 2g, and described water inlet 2f is positioned at the below of described division board 2d, and delivery port 2g is positioned at the top of division board 2d; The upper and lower end of described outer crystallizer inner sleeve 2b runs through respectively water flow hole 2h; Described outer crystallizer 2 is provided with the second collet 2i with described strand 4 junction, and namely the second collet 2i is positioned at the inner side of outer crystallizer 2.
Wherein, described outer crystallizer 2 is connected in described foundation means 6 by outer crystallizer flange 2j, and herein, outer crystallizer flange 2j is connected to the top of crystallizer copper pipe 2c, outer crystallizer flange 2j is combined with the second pedestal flange 6g, to be connected in foundation means 6 by outer crystallizer 2.Described second collet 2i can be high strength graphite.Magnetic stirrer 2e is configured in outer crystallizer 2, can carry out fragmentation, stirs to form a large amount of nucleus to crystal grain.
In the present embodiment, outer crystallizer inside and outside cover has gap between 2b, 2a, and the inside and outside interval of cover between 2b, 2a is separated into upper and lower two independently spaces by division board 2d; Between outer crystallizer inner sleeve 2a and crystallizer copper pipe 2c, there is gap.As shown in the direction of arrow in Fig. 4, cooling water enters the gap of the inside and outside below of cover between 2b, 2a of outer crystallizer from water inlet 2f, then the gap between outer crystallizer inner sleeve 2a and crystallizer copper pipe 2c is flowed into from the water flow hole 2h of 2a lower end in outer crystallizer, then flowed into by the water flow hole 2h of 2a upper end in outer crystallizer in the gap of the inside and outside top of cover between 2b, 2a, more then flow out from delivery port 2g.The cooling water interior flowing of crystallizer 2 outside, after carrying out heat exchange, flows out hot water from delivery port 2g with the molten metal of outer crystallizer 2 inside.
According to the embodiment of the present invention, as shown in Figure 6 and Figure 7, described cap sheathing mechanism 5 comprises the upper cover housing 5a in Jiong shape, and the bottom outside of described upper cover housing 5a is connected with the first upper cover flange 5b, is used for connecting described foundation means 6.The bottom of described upper cover housing 5a is connected with adiabatic heat-insulation lining body 5c.The central shaft of described cap sheathing mechanism 5 is provided with interior crystallizer perforation 5d to running through, described cap sheathing mechanism 5 axially runs through and is provided with the mouth of a river and penetrates hole 5e, the described mouth of a river penetrates the outside that hole 5e is positioned at described interior crystallizer perforation 5d, the position of the corresponding interior crystallizer perforation in the top 5d of described upper cover housing 5a is provided with the second upper cover flange 5f, is used for connecting described interior crystallizer 1.In the present embodiment, interior crystallizer 1 is fixed on the second upper cover flange 5f through interior crystallizer perforation 5d, and interior crystallizer 1 and cap sheathing mechanism 5 are combined, and molten metal penetrates hole 5e and flows in cap sheathing mechanism 5 from the mouth of a river, meanwhile, the mouth of a river penetrates the situation that hole 5e can be used for observing liquid level.Herein, be provided with two equally distributed mouths of a river in the surrounding of interior crystallizer perforation 5d and penetrate hole 5e.
In the bottom of described adiabatic heat-insulation lining body 5c, tangentially extend laterally from the edge of described interior crystallizer perforation 5d and be provided with slag trap 5g, the molten metal be distributed in endless metal liquid molten bath 3 is separated with upper strata scum silica frost by slag trap 5g, as shown in Figure 9, there are two slag trap 5g herein.Described cap sheathing mechanism 5 axially runs through to be provided with and diffuses hole 5h, described diffuse hole 5h be positioned at described interior crystallizer perforation 5d outside, being provided with on the top of described upper cover housing 5a to cover can avoid the heat in endless metal liquid molten bath 3 to spread from diffusing hole 5h at the described adiabatic cover plate 5i diffusing 5h upper end, hole, adiabatic cover plate 5i.Herein, be provided with two in the surrounding of interior crystallizer perforation 5d and equally distributedly diffuse hole 5h, diffuse hole 5h for discharging in casting initial stage and casting cycle the gas producing in the die cavity of endless metal liquid molten bath 3 and bring into, in addition, diffusing hole can also as observation, thermometer hole etc.
As shown in Figure 7, described adiabatic heat-insulation lining body 5c comprises fire-resistant stamp mass 5j and adiabatic refractory lining 5k, described adiabatic refractory lining 5k is connected to the bottom of the inner chamber of described upper cover housing 5a, fills described fire-resistant stamp mass 5j between described upper cover housing 5a and described adiabatic refractory lining 5k.After interior crystallizer 1 inserts interior crystallizer perforation 5d, fire-resistant stamp mass 5j and adiabatic refractory lining 5k is enclosed in interior crystallizer 1 respectively and is in position in cap sheathing mechanism 5 in upper-lower position.
As shown in Figure 8 and Figure 9, described foundation means 6 comprises the base housing 6a in concave shape, the top outer of described base housing is connected with the first pedestal flange 6b for connecting described cap sheathing mechanism, described first pedestal flange and described first upper cover flange 5b are by fastening connection piece secure bond, and then cap sheathing mechanism 5 and foundation means 6 are fixed together, wherein, fastening connection piece can be such as the combination of flange bolt 5m and flange nut 6j.Described base housing 6a is provided with refractory lining body 6c, the central shaft of described foundation means 6 is provided with base central hole 6d to running through, and the position of the corresponding base central hole 6d in bottom of described base housing 6a is provided with the second pedestal flange 6g for connecting described outer crystallizer 2.
Described foundation means 6 top offers the tangent line ingate 6h with described base central hole arranged tangential, and it is corresponding that outer end and the above-mentioned mouth of a river of described tangent line ingate penetrate hole 5e, and inner and described base central hole 6d is connected.
Described foundation means bottom, is positioned at described outer crystallizer top loop and is provided with variable frequency induction coil 6e, and the outside of variable frequency induction coil encircling central hole 6d in the susceptor, is provided with coils protective hood 6f outside variable frequency induction coil 6e.Wherein, can be separated by refractory lining body 6c between variable frequency induction coil 6e and molten metal.At normal process of billet withdrawal, variable frequency induction coil 6e adopts low frequency have auxiliary stirring, broken primary grain, homogenising internal and external temperature and outwards conduct heat, and forming core core is delivered to the effect of core, in the throwing later stage, adopt power frequency or intermediate frequency, for remaining molten steel heating, insulation effect.In addition, outside and also can be arranged with magnetic Astatine magnetic conductor 6p in coils protective hood 6f inside at variable frequency induction coil 6e.
Described foundation means 6 is axially arranged with slag-drip opening 3a, and described slag-drip opening, with above-mentioned to diffuse hole 5h corresponding, is connected with trough 6i between described slag-drip opening and described base central hole 6d.Herein, there are two equally distributed tangent line ingate 6h, and there are two equally distributed trough 6i.
In the present embodiment, the molten metal entering cap sheathing mechanism 5 enters foundation means 6 from tangent line ingate 6h, molten metal is changed into the tangential direction of annularly cavity by tangent line ingate 6h from vertical direction, after annularly cavity move in a circle, the liquid slag swum in above molten metal is blocked by the slag trap 5g on cap sheathing mechanism 5, and is flowed out slag-drip opening 3a along trough 6i in company with molten metal rotary course.
In addition, wherein, as shown in Figure 1, during installation, can be arranged on steel structure base 3b by foundation means 6, on steel structure base 3b, storage slag pan 3c can be placed in the position of corresponding slag-drip opening 3a, makes the scum silica frost of discharging from slag-drip opening 3a fall into storage slag pan 3c.
Described refractory lining body 6c comprises high-temperature flame-proof lining 6k; carbon fire-resistance brick lining 6m and knotting refractory matter 6n; described high-temperature flame-proof lining 6k is located at the top of the inner chamber of described base housing 6a; described carbon fire-resistance brick lining 6m is located at the bottom of described high-temperature flame-proof lining 6k and is positioned at around described base central hole 6d; described knotting refractory matter 6n is filled between described high-temperature flame-proof lining 6k and base housing 6a, and is positioned at the outside of described coils protective hood 6f.That is, in the present embodiment, high-temperature flame-proof lining 6k all contacts with high-temperature liquid metal with carbon fire-resistance brick lining 6m, and the lower end of carbon fire-resistance brick lining 6m is adjacent with outer crystallizer 2, variable frequency induction coil 6e is located at the periphery of carbon fire-resistance brick lining 6m, and is protected by coils protective hood 6f; High-temperature flame-proof lining 6k and carbon fire-resistance brick lining 6m forms pedestal inner operative lining, is filled between base housing 6a and pedestal inner operative serve as a contrast by the refractory matter 6n that ties a knot.
As shown in Figure 1 and Figure 5, described casting device also comprises the second water-cooling system 9, and described second water-cooling system 9 is connected to the below of described outer crystallizer 2, and described second water-cooling system 9 comprises outer two water-cooled ejection assemblies 9a and secondary cooling zone foot roller 9e.Described outer two water-cooled ejection assemblies 9a comprise the how exclusive di-cold spray nozzle ring group 9b axially arranged along circle base 4, every exclusive di-cold spray nozzle ring group 9b has the multiple outer two water-cooled nozzle 9c along blank excircle Zhou Junbu, and two water-cooled ejection assemblies 9a outsides are provided with Steam Recovery case 9d outside.Secondary cooling zone foot roller 9e is arranged between two neighbouring outer two water-cooled nozzle ring group 9b, round base 4 is sprayed to as much as possible with the current making outer two water-cooled nozzle 9c eject, and can not be blocked by secondary cooling zone foot roller 9e, secondary cooling zone foot roller 9e can be used to clamp the red heat strand 4 with liquid core.
In the present embodiment, the outer two water-cooled nozzle 9c of outer two water-cooled ejection assemblies 9a are for continuing the strand outer surface cooling out crystallizer, outer two water-cooled ejection assemblies 9a include nine exclusive two water-cooled nozzle ring group 9b of the length direction setting along circle base 4, figure is signal just, nozzle number can 5 ~ 50 rows depending on cooling length, each outer two water-cooled nozzle ring group 9b have multiple outer two water-cooled nozzle 9c, the quantity of outer two water-cooled nozzle 9c can as required and the diameter of circle base 4 decide, herein, each outer two water-cooled nozzle ring group 9b have 6 ~ 12 outer two water-cooled nozzle 9c.
As shown in Figure 1, described tundish 7 can be and adopts the tundish of Electromagnetic Heating, and the bottom of tundish 7 has and goes out molten steel mouth; The top of casting fluidic distributor 8 has one and connects molten steel mouth, the bottom of casting fluidic distributor 8 can be evenly distributed with 1 to 4 isocon 8a, the quantity of isocon 8a is identical with the quantity that the mouth of a river of cap sheathing mechanism 5 penetrates hole 5e, herein, there are two isocon 8a, that is, herein, cast fluidic distributor 8 current in tundish 7 to be assigned as symmetrical 180 ° of two conductance and to enter in cap sheathing mechanism 5; Certainly, as required, cast fluidic distributor 8 and also the current in tundish 7 can be assigned as first-class, three streams or three streams are above imports in cap sheathing mechanism 5.
Below described outer crystallizer 2, be equipped with many row foldings hold guide roller 12, be used for clamping by interior crystallizer 1 and the outer crystallizer 2 red heat strand 4 with liquid core out.
Described casting device also comprises lifting push rod 11, and described lifting push rod 11 is connected to the bottom of described cylinder dummy ingot 10, and drives cylindrical dummy ingot 10 to move up and down.In the present embodiment, opening the initial stage of watering, cylindrical dummy ingot 10 seals bottom the circular cavity below described outer crystallizer 2, and along with the carrying out of casting, the cylindrical dummy ingot 10 of lifting push rod 11 drag down, makes casting blank shell deviate from from crystallizer.
In addition, lifting push rod 11 also can do periodically up-down vibration while the cylindrical dummy ingot 10 of drag down, the relatively inside and outside crystallizer of casting blank shell is moved up and down, play the object of the more easy shelling of casting blank shell and inside and outside crystallizer 1,2, and upper and lower relative motion between base shell and interior crystallizer 1, play tamping central tissue under semisolid, eliminate central pipe, fluffing action.
As shown in Figure 10, in strand and the whole upper and lower tamping cycle of base shell, can describe by four-stage process the following:
As shown in Figure 10 (a), first stage: be original state, be now that interior crystallizer 1 elongates process with the solid solid phase spacing in below, by the high-temperature liquid-phase of top, namely hyperthermia and superheating molten metal 4c puts into V molten bath, center, in casting cavity, be followed successively by from the top down between hyperthermia and superheating molten metal 4c and normal strand 4, the mistake sluggish metal 4d (solid phase ratio 0-30%) of enriched nucleus, the first semisolid two-phase section 4e (solid phase ratio 60-90%) and closely knit high temperature solid-state 4g;
As shown in Figure 10 (b), second stage: be first solidify the forming core stage, now for the mistake sluggish metal 4d (solid phase ratio 0-30%) that enters the enriched nucleus in molten bath, center is by the heat transfer of below and side with cool by the heat transfer of top and inner side interior crystallizer 1, form the lower V-type solid-liquid two-phase region 4e (solid phase ratio >=60-90%) near lower solidifying body and the upper V-type solid-liquid two-phase region 4f near upper V-type interior crystallizer, upper V-type solid-liquid two-phase region 4f is also known as the second semisolid two-phase section (solid phase ratio 30-60%);
As shown in Figure 10 (c), the phase III: be second solidify the forming core stage, the fraction solid ratio of upper and lower V-type solid-liquid two-phase region 4f, 4e continues to increase, and the pure liquid phase region simultaneously constantly reduces, and last upper and lower solid-liquid two-phase region is tending towards merging;
As shown in Figure 10 (d), fourth stage: be semisolid bonding phase, interior crystallizer 1 is relative with below solid solid phase 4g spacing to be shortened, namely strand 4 is relied on to move with the opposing compression of interior crystallizer 1, by the semisolid Mushy Zone pressing at middle part, make the loose hole compacting of association in two-phase section, play the object eliminating loose shrinkage cavity, the whole period of motion terminates; The solid solid phase spacing of interior crystallizer and below is again pulled open and is entered next circulation.
In addition, the relative motion up and down of interior crystallizer 1 and casting blank shell, the method of the relative motion namely between interior crystallizer 1 and the solid solid phase 4g in below, except above-mentioned lifting push rod also can do periodically up-down vibration while the cylindrical dummy ingot 10 of drag down, make outside the relatively inside and outside crystallizer of casting blank shell moves up and down, also have method as follows: realize by moving up and down of drawing billet mechanism, the inside and outside crystallizer 1,2 on top is motionless together with foundation means 6, cap sheathing mechanism 5; Or, by being arranged on the hydraulic vibration mechanism between steel structure base 3b, dragging foundation means 6 and carrying out upper and lower periodic motion realization with inside and outside crystallizer 1,2; Or, drive the periodicity of interior crystallizer 1 to move up and down by the elevating mechanism be arranged on the interior crystallizer flange 1f on cap sheathing mechanism 5.Wherein, drawing billet mechanism, hydraulic vibration mechanism and elevating mechanism are well known to those skilled in the art, and do not repeat them here.
As shown in Figure 1, the following describes the operating process of the embodiment of the present invention:
(1) assemble: as shown in Figure 3, complete each subassembler and do, and dummy ingot 10 is arranged in the below cavity of interior crystallizer 1 and outer crystallizer 2, and process periphery gap, material casting can be treated;
(2) cast: qualified molten steel is winched to above tundish 7, open steel ladle mouth of a river control system, molten steel amount in tundish 7 reaches the liquid outlet opening tundish 7 after 80%, molten steel penetrates the 5e of hole from the mouth of a river that molten steel mouth introduces the cap sheathing mechanism 5 of 180 degree each other respectively via casting fluidic distributor 8 that goes out of tundish 7, molten steel is then rotating by tangent line ingate 6h the round base entering foundation means 6 and casts in chamber, molten metal moves in a circle in casting chamber, the scum silica frost swum on metal bath surface realizes steel by difference in specific gravity in rotary course, slag is separated, and the slag trap 5g be installed on cap sheathing mechanism 5 is separated and enters trough 6i, discharge from slag-drip opening 3a,
Molten metal is subject to the cooled and solidified of interior crystallizer 1 and outer crystallizer 2 and forms base shell, base shell passes through dummy ingot 10 while downward throwing, lifting push rod 11 drives the relative crystallizer 1,2 of dummy ingot, strand to do up-down vibration, base shell and crystallizer are departed from, move down gradually under casting speed, base shell progressive additive, forms the V-type solidified shell along inside and outside crystallizer 1,2 both sides and core V-type liquid core in crystallizer simultaneously; The base shell pulling out inside and outside crystallizer moment red heat when base shell is exposed in the middle of air, enters the second water-cooling system 9;
(3) cooling controls: the red heat big cross section strand with liquid core entering the second water-cooling system 9, outer surface is subject to the cooling of the outer two water-cooled nozzle 9c below from outer crystallizer 2, temperature declines gradually, and liquid core ratio is decreased to gradually bottom V-type and is fully formed solid;
(4) electromagnetic agitation and heating stop watering: after over-heat metal liquid injects die cavity, chilling temperature by the chilled(cooling) water return (CWR) on interior crystallizer 1 and outer crystallizer 2 and variable frequency induction coil 6e declines, and face of cylinder inner chamber is formed faint solidification layer or crosses cold metal layer;
At normal casting cycle, the main periodic low frequency alternating magnetic field of variable frequency induction coil 6e is implemented to stir to crossing cold metal layer, mixing, promoting non-homogeneous core amounts in molten metal by crossing sluggish metal with the liquid of higher temperatures in the middle part of liquid; The casting later stage, pulling rate is coordinated to reduce gradually, until stopping drawing, top feeding liquid is only used for supplementary V-type liquid core and solidifies required when being equal to the part of rising head, the operating frequency of variable frequency induction coil 6e changes power frequency or intermediate frequency continued power into, now water-cooled variable frequency induction coil 6e serves as the effect of eddy-current heating holding furnace, plays riser head heat-preserving heating effect;
Subsequently, along with liquid core constantly reduces, when liquid core end progressively enters in crystallizer, progressively reduce the cooling water in interior crystallizer 1, and slowly promote interior crystallizer 1 until residual metallic liquid all enters in base shell in variable frequency induction coil 6e, extract interior crystallizer 1 completely, covering insulation material above residual metallic liquid, until solidify completely;
(5) de-ingot: normally casting process continuously in lower end, complete solidification zone, being taken out solidifying steel billet by heat hard iron, realizing continuous billet casting from casting system; Also, after can casting certain length continuously, stop casting (as stopping in above-mentioned (4) waters step) till residual metallic liquid solidifies completely, finally whole ingot blank is once taken out, realize semicontinuous strand.
The embodiment of the present invention has the following advantages compared with conventional method:
1, because the embodiment of the present invention adopts cap sheathing mechanism 5, foundation means 6 and the special fixed form of center interior crystallizer 1, fixing, the concentric replacing of inside and outside crystallizer 1,2 is become and is more prone to convenient.
2, because the embodiment of the present invention adopts the two-way cooling of inside and outside crystallizer 1,2 pairs of strands, make slab cooling, solidify adaptable effective thickness and greatly increase, the strand diameter that can cast and conventional method thicken nearly one times.
3, because the solid strand of the embodiment of the present invention have employed the structure of special rocket head interior crystallizer 1 and special core semisolid makes debulking methods firm by ramming, serve pressure to roll conjunction central pipe, loosen, serve decisive role to elimination big cross section center coagulation defect, mechanism is more simple compared with traditional casting billet surface liquid core soft reduction method, effect is more obvious.
4, because the embodiment of the present invention adopts vertical casting throwing method, avoid big cross section circle base horizontal casting and circumferentially solidify down inconsistent, impurity or be segregated in the deficiency that the first half assembles, ensure that the uniformity of whole slab quality.
5, because embodiment of the present invention casting system have employed bitangent formula ingate structure, molten metal rotates into die cavity from tangent line ingate 6h, avoid whole section particularly large section casting temperature, solidify inconsistent phenomenon, utilize slag difference in specific gravity to be separated slag effect in addition simultaneously.
6, the track rotated at upper cover molten metal due to the embodiment of the present invention is provided with slag sluicing system baffle mechanism, namely there is slag trap 5g, effectively can realize being separated of scum silica frost and clean metal liquid, discharge.
7, because the inside and outside crystallizer 1,2 of the embodiment of the present invention all have employed high strength graphite compound working lining, effectively can play the effect of protection copper sheathing crystallizer, have the auxiliary effect of lubrication shelling, the casting of unprotect slag can be realized.
8, because the embodiment of the present invention is provided with variable frequency induction coil 6e, achieve the advantageous effect of normal productive process electromagnetic agitation, crystal grain thinning, adjustment chamber inner metal liquid temperature, coordinate the change of tail base casting speed, serve the insulation of tail base riser heating simultaneously, shorten the shrinkage cavity of tail base, the draw, improve the important result of strand lumber recovery.
In sum, due to the application of above measure, make the continuous casting of the solid strand of the large section of the embodiment of the present invention no longer by the restriction of specifications section, second water-cooling system and the semi-solid phase of inside and outside crystallizer cooling system, surfaces externally and internally water spray make method, the effect of variable frequency induction coil tail base heating and thermal insulation firm by ramming, serve the effect improving casting quality, improve lumber recovery.
Embodiment two
The embodiment of the present invention also proposed a kind of casting method of big cross section continuous casting billet, and it comprises step:
A, provide interior crystallizer 1, outer crystallizer 2, cap sheathing mechanism 5 and foundation means 6; The inside of foundation means and cap sheathing mechanism 5 is interconnected, and cap sheathing mechanism 5 is fixedly connected with foundation means about 6; Outer crystallizer 2 is fixedly connected on the below of described foundation means 6; Interior crystallizer 1 is inverted rocket head-like structure, interior crystallizer 1 is fixedly connected on described cap sheathing mechanism 5, and the below of interior crystallizer 1 is arranged in the inside of described cap sheathing mechanism 5 and foundation means 6, make the bottom of described interior crystallizer 1 be positioned at the inner side of described outer crystallizer 2, and put by the winding of described outer crystallizer 2 concentric ring;
B, the cylindrical dummy ingot 10 providing section to be solid round shape and lifting push rod 11, lifting push rod 11 is connected to the bottom of cylindrical dummy ingot, and drives dummy ingot to move up and down, and described cylindrical dummy ingot is arranged on the cavity bottom below described outer crystallizer 2;
C, molten metal is introduced in cap sheathing mechanism 5, and then make molten metal be filled between described interior crystallizer 1 and outer crystallizer 2, molten metal forms base shell through the two-way cooling of interior crystallizer 1 and outer crystallizer 2, be elevated push rod drives cylindrical dummy ingot to move downward simultaneously, makes to produce relative motion periodically up and down between base shell and inside and outside crystallizer simultaneously; Relative motion up and down between base shell and interior crystallizer plays to base shell the effect of making firm by ramming, the relative motion up and down between base shell and outer crystallizer, plays the effect that the outer surface of base shell and outer crystallizer shell;
D, progressive additive along with base shell, form the round base solidified.
Furthermore, the method producing relative motion periodically up and down between base shell and interior crystallizer is made to have following several in described step C:
(1) while making described lifting push rod 11 drive described cylindrical dummy ingot 10 to move downward, make lifting push rod 11 drive cylindrical dummy ingot 10 to move up and down, make between base shell and inside and outside crystallizer 1,2, to produce relative motion periodically up and down; Now, inside and outside crystallizer 1,2 is motionless together with foundation means 6, cap sheathing mechanism 5.
(2) on cylindrical dummy ingot 10, drawing billet mechanism is set in addition, drives cylindrical dummy ingot 10 to move up and down by drawing billet mechanism, make between base shell and inside and outside crystallizer 1,2, to produce relative motion periodically up and down; Now, inside and outside crystallizer 1,2 is motionless together with foundation means 6, cap sheathing mechanism 5.
(3) on described interior crystallizer 1, arrange elevating mechanism, elevating mechanism drives interior crystallizer 1 to do and periodically moves up and down.Or,
(4) on steel structure base 3b, hydraulic vibration mechanism is installed, carries out periodicity by hydraulic vibration mechanism dragging foundation means 6 with inside and outside crystallizer 1,2 and move up and down.
Other further steps of present embodiment and structure can identical with embodiment one, do not repeat them here.
The foregoing is only several embodiments of the present invention, those skilled in the art does not depart from the spirit and scope of the present invention according to carrying out various change or modification to the embodiment of the present invention disclosed in application documents.

Claims (16)

1. the continuous casting apparatus of a big cross section circle base, described casting device comprises interior crystallizer (1), outer crystallizer (2), the bottom of described interior crystallizer (1) is positioned at the inner side of outer crystallizer (2), and put by outer crystallizer (2) concentric ring winding, be filled with molten metal between described interior crystallizer (1) and outer crystallizer (2); It is characterized in that, described casting device also comprises cap sheathing mechanism (5), foundation means (6), section is the cylindrical dummy ingot (10) of solid round shape, the tundish (7) of band heating and casting fluidic distributor (8); Foundation means (6) is interconnected with the inside of cap sheathing mechanism (5), and cap sheathing mechanism (5) is fixedly connected with up and down with foundation means (6); Outer crystallizer (2) is fixedly connected on the below of described foundation means (6); Described interior crystallizer (1) is inverted rocket head-like structure, interior crystallizer (1) is fixedly connected on cap sheathing mechanism (5), and the below of interior crystallizer (1) is arranged in the inside of cap sheathing mechanism (5) and foundation means (6), the molten metal in tundish (7) is assigned as in first-class or multithread importing cap sheathing mechanism (5) by described casting fluidic distributor (8); Opening the initial stage of watering, described cylindrical dummy ingot (10) is arranged on bottom the circular cavity of outer crystallizer (2) below, described molten metal forms through the cooling of inside and outside crystallizer (1,2) the round base (4) solidified, and described round base is positioned on cylindrical dummy ingot (10);
Described interior crystallizer (1) comprises into water straight catheter, backwater conduit and chilled(cooling) water return (CWR); Backwater conduit compartment of terrain is around in outside described water inlet straight catheter, and described backwater conduit comprises the backwater straight catheter and interior crystallizer overcoat that connect up and down, and described interior crystallizer overcoat is V-shaped, and the outside of described backwater conduit is coated with the first collet; Chilled(cooling) water return (CWR) is arranged on the inside of described interior crystallizer;
Described first collet (1g) comprises high-temperature flame-proof pipe (1m) and high strength graphite (1n), described high-temperature flame-proof pipe (1m) is coated on the outside of described backwater straight catheter (1j), the outside of the coated described interior crystallizer overcoat (1k) of described high strength graphite (1n).
2. the continuous casting apparatus of big cross section circle base according to claim 1, it is characterized in that, described chilled(cooling) water return (CWR) comprises into water loop (1a), water return loop (1b) and water hole (1c); Water inlet loop (1a) is positioned at described water inlet straight catheter, and the upper end of described water inlet loop (1a) is water inlet (1d); Gap between described water inlet straight catheter (1h) and backwater conduit (1i) forms described water return loop (1b), and the upper end of described water return loop (1b) is water return outlet (1e); Between the lower end that water hole (1c) is arranged on described water inlet straight catheter (1h) and described interior crystallizer overcoat (1k), described water inlet loop (1a) is connected by water hole (1c) with water return loop (1b).
3. the continuous casting apparatus of big cross section circle base according to claim 1, it is characterized in that, the top of described interior crystallizer (1) has interior crystallizer flange (1f), and described interior crystallizer (1) is fixed on described cap sheathing mechanism (5) by described interior crystallizer flange (1f).
4. the continuous casting apparatus of big cross section circle base according to claim 3, it is characterized in that, described backwater conduit (1i) also comprises backwater and emits conduit (1p), described backwater emits conduit (1p) compartment of terrain to be set in the outside of described water inlet straight catheter, and be connected to the top of backwater straight catheter (1j), described backwater emits the gap between conduit with water inlet straight catheter to be connected with described water return loop, described water return outlet (1e) is arranged on backwater and emits on conduit (1p), described interior crystallizer flange (1f) is positioned at the top of described backwater straight catheter (1j).
5. the continuous casting apparatus of big cross section circle base according to claim 1, it is characterized in that, described cap sheathing mechanism (5) comprises the upper cover housing (5a) in Jiong shape, the bottom outside of described upper cover housing (5a) is connected with the first upper cover flange (5b) for connecting described foundation means (6), and the inner chamber of described upper cover housing (5a) has built adiabatic heat-insulation lining body (5c) by laying bricks or stones; The central shaft of described cap sheathing mechanism (5) is provided with interior crystallizer perforation (5d) to running through, described cap sheathing mechanism (5) is upper axially to be run through and is provided with the mouth of a river and penetrates hole (5e), the described mouth of a river penetrates the outside that hole (5e) is positioned at described interior crystallizer perforation (5d), and the position of corresponding interior crystallizer perforation (5d) in top of described upper cover housing (5a) is provided with the second upper cover flange (5f) for connecting described interior crystallizer (1).
6. the continuous casting apparatus of big cross section circle base according to claim 5, it is characterized in that, in the bottom of described adiabatic heat-insulation lining body (5c), tangentially extend laterally from the edge of described interior crystallizer perforation (5d) and be provided with slag trap (5g); Described cap sheathing mechanism (5) axially runs through to be provided with and diffuses hole (5h), described diffuse hole (5h) be positioned at described interior crystallizer perforation (5d) outside, be provided with on the top of described upper cover housing (5a) and cover at the described adiabatic cover plate (5i) diffusing hole (5h) upper end.
7. the continuous casting apparatus of big cross section circle base according to claim 5, it is characterized in that, described adiabatic heat-insulation lining body (5c) comprises fire-resistant stamp mass (5j) and adiabatic refractory lining (5k), described adiabatic refractory lining (5k) is connected to the bottom of the inner chamber of described upper cover housing (5a), fills described fire-resistant stamp mass (5j) between described upper cover housing (5a) and described adiabatic refractory lining (5k).
8. the continuous casting apparatus of big cross section circle base according to claim 5, it is characterized in that, described foundation means (6) comprises the base housing (6a) in concave shape, the top outer of described base housing is connected with the first pedestal flange (6b) for connecting described cap sheathing mechanism, described first pedestal flange and described first upper cover flange (5b) are by fastening connection piece secure bond, described base housing is provided with refractory lining body (6c), the central shaft of described foundation means is provided with base central hole (6d) to running through, the position in the corresponding base central hole, bottom of described base housing (6a) is provided with the second pedestal flange (6g) for connecting described outer crystallizer (2).
9. the continuous casting apparatus of big cross section circle base according to claim 8, it is characterized in that, described foundation means (6) top offers the tangent line ingate (6h) with described base central hole arranged tangential, it is corresponding that outer end and the above-mentioned mouth of a river of described tangent line ingate penetrate hole (5e), and inner and described base central hole (6d) is connected.
10. the continuous casting apparatus of big cross section circle base according to claim 8; it is characterized in that; described foundation means bottom; be positioned at described outer crystallizer top loop and be provided with variable frequency induction coil (6e); the outside of variable frequency induction coil encircling central hole in the susceptor, is provided with coils protective hood (6f) outside variable frequency induction coil.
The continuous casting apparatus of 11. big cross section circle bases according to claim 6, it is characterized in that, described foundation means (6) is axially arranged with slag-drip opening (3a), described slag-drip opening is corresponding with above-mentioned hole (5h) of diffusing, and is connected with trough (6i) between described slag-drip opening and described base central hole (6d).
The continuous casting apparatus of 12. big cross section circle bases according to claim 10, it is characterized in that, described refractory lining body (6c) comprises high-temperature flame-proof lining (6k), carbon fire-resistance brick lining (6m) and knotting refractory matter (6n), described high-temperature flame-proof lining (6k) is located at the top of the inner chamber of described base housing (6a), described carbon fire-resistance brick lining (6m) is located at the bottom of described high-temperature flame-proof lining (6k) and is positioned at described base central hole (6d) around, described knotting refractory matter (6n) is filled between described high-temperature flame-proof lining (6k) and base housing (6a), and be positioned at the outside of described coils protective hood (6f).
The continuous casting apparatus of 13. big cross section circle bases according to claim 1, it is characterized in that, described casting device also comprises the second water-cooling system (9), described second water-cooling system (9) is connected to the below of described outer crystallizer (2), and described second water-cooling system (9) comprises outer two water-cooled ejection assemblies (9a) and secondary cooling zone foot roller (9e); Described outer two water-cooled ejection assemblies (9a) comprise the how exclusive di-cold spray nozzle ring group (9b) axially arranged along strand (4), every exclusive di-cold spray nozzle ring group (9b) has along uniform multiple outer two water-cooled nozzle (9c) of strand excircle, and two water-cooled ejection assemblies (9a) outsides are provided with Steam Recovery case (9d) outside; Secondary cooling zone foot roller (9e) is arranged between two neighbouring outer two water-cooled nozzle ring groups (9b), is used for clamping red heat circle base (4) with liquid core.
The continuous casting apparatus of 14. big cross section circle bases according to claim 3, it is characterized in that, described interior crystallizer flange (1f) is provided with elevating mechanism, and described elevating mechanism drives described interior crystallizer (1) periodically to move up and down.
The continuous casting apparatus of 15. big cross section circle bases according to claim 1, it is characterized in that, described casting device also comprises lifting push rod (11), described lifting push rod (11) is connected to the bottom of described cylindrical dummy ingot (10), and drives cylindrical dummy ingot to move up and down.
The continuous casting apparatus of 16. big cross section circle bases according to claim 1, is characterized in that, be equipped with many row foldings hold guide roller (12) in described outer crystallizer (2) below.
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