CN202571213U - Continuous casting device for large-section round billet - Google Patents
Continuous casting device for large-section round billet Download PDFInfo
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- CN202571213U CN202571213U CN 201220276360 CN201220276360U CN202571213U CN 202571213 U CN202571213 U CN 202571213U CN 201220276360 CN201220276360 CN 201220276360 CN 201220276360 U CN201220276360 U CN 201220276360U CN 202571213 U CN202571213 U CN 202571213U
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Abstract
A continuous casting device for a large-section round billet comprises an inner crystallizer, an outer crystallizer, an upper cover mechanism, a base mechanism, a cylindrical dummy ingot with solid circular section, a heating tundish and a casting strand distributor. The base mechanism is communicated with the interior of the upper cover mechanism and has the upper end and the lower end fixed, and the outer crystallizer is fixed below the base mechanism. The inner crystallizer is structured in an inverted rocket head structure and fixedly connected on the upper cover mechanism, the lower portion of the inner crystallizer is penetratingly arranged inside the upper cover mechanism and the base mechanism so as to be arranged inside the outer crystallizer and concentrically surrounded by the outer crystallizer, the casting strand distributor distributes metal liquid in the tundish into one flow or multiple flows which are led into the upper cover mechanism, and the metal liquid is filled between the inner crystallizer and the outer crystallizer. During primary casting, the cylindrical dummy ingot is arranged at the bottom of a circular cavity below the outer crystallizer, and the metal liquid is cooled by the inner crystallizer and the outer crystallizer to form a concretionary round billet on the cylindrical dummy ingot.
Description
Technical field
The utility model relates to a kind of continuous casting apparatus of big section circle base.
Background technology
Development along with industries such as oil, chemical industry, wind-powered electricity generation, nuclear powers; Large diameter tubular blank, tubular blank, annular blank and big section high-quality solid ingot blank demand constantly increase; Tradition ingot casting forging punching, counter-boring techniques can't satisfy the demand of quality, efficient, cost; Along with the increasing of casting section diameter, center porosity, shrinkage cavity, segregation worsen, yield rate low (50-65%), the low inferior serious development that is restricting the sector of production efficiency.
And the continuous casting technology; Owing to receive the influence that big section conducts heat; Strand internal soundness and production efficiency also significantly reduce with the increasing of cross section diameter; Even the liquid core is gently depressed the further increase of technology along with diameter, the round billet surface deformation is a little less than the transmission at center becomes more and more, so that the above solid continuous casting billet of diameter 1000mm has become to cast continuously the forbidden zone that is difficult to go beyond.
The utility model content
The purpose of the utility model is, a kind of continuous casting apparatus of big section circle base is provided, and it can be fit to the manufacturing of the solid strand of big specification.
The above-mentioned purpose of the utility model can adopt following technical proposal to realize:
A kind of continuous casting apparatus of big section circle base, said casting device comprises interior crystallizer, outer crystallizer, loam cake mechanism, foundation means, section is the cylindrical dummy ingot of filled circles shape, the tundish of band heating and casting fluidic distributor; The inside of foundation means and loam cake mechanism is interconnected, and loam cake mechanism is fixedly connected up and down with foundation means; Outer crystallizer is fixedly connected on the below of said foundation means; Said interior crystallizer is inverted rocket head-like structure; Interior crystallizer is fixedly connected in the loam cake mechanism; And the below of interior crystallizer is arranged in the inside of loam cake mechanism and foundation means, makes the bottom of said interior crystallizer be positioned at the inboard of outer crystallizer, and is put by the winding of outer crystallizer concentric ring; Said casting fluidic distributor is assigned as the molten metal in the tundish first-class or multithread imports in the loam cake mechanism, is filled with molten metal between said interior crystallizer and the outer crystallizer; Opening the initial stage of watering, said cylindrical dummy ingot is arranged on the circular cavity bottom of outer crystallizer below, and said molten metal forms the round base that solidifies through the cooling of inside and outside crystallizer, and said round base is positioned on the cylindrical dummy ingot.
Characteristics and the advantage of the utility model embodiment are: it adopts interior crystallizer to combine with outer crystallizer; Strand is carried out two-way cooling; Making the strand cooling and solidifying adaptable useful area increases greatly; Thereby the solid strand that can be fit to big specification, in addition, the utility model embodiment also can realize continuously and semi-continuous casting.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure section sketch map that the big section of the utility model embodiment is justified the continuous casting apparatus of base;
Fig. 2 is the assembling process sketch map that the big section of the utility model embodiment is justified the continuous casting apparatus conticaster parts of base;
Fig. 3 is the structural representation of interior crystallizer of continuous casting apparatus of the big section circle base of the utility model embodiment;
Fig. 4 is in order to show the local enlarged diagram of outer crystallizer in the continuous casting apparatus of big section circle base of the utility model embodiment;
Fig. 5 is in order to show the local enlarged diagram of second water-cooling system in the continuous casting apparatus of big section circle base of the utility model embodiment;
Fig. 6 is the elevational schematic view of loam cake mechanism of continuous casting apparatus of the big section circle base of the utility model embodiment;
Fig. 7 is the A-O-A line generalized section along Fig. 6;
Fig. 8 is the elevational schematic view of foundation means of continuous casting apparatus of the big section circle base of the utility model embodiment;
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 pressing process sketch map that the big section of the utility model embodiment is justified the continuous casting apparatus of base.
The specific embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one
As depicted in figs. 1 and 2; The continuous casting apparatus of the big section circle base that the utility model embodiment proposes; It comprises interior crystallizer 1, outer crystallizer 2, loam cake mechanism 5, foundation means 6, and section is the cylindrical dummy ingot 10 of filled circles shape, the tundish 7 of band heating and casting fluidic distributor 8.The inside of said loam cake mechanism 5 and foundation means 6 is interconnected, and loam cake mechanism 5 is fixedly connected up and down with foundation means 6, and has constituted endless metal liquid molten bath 3.Said outer crystallizer 2 is fixedly connected on the below of foundation means 6; Said interior crystallizer 1 is inverted rocket head-like structure; Interior crystallizer 1 is fixedly connected in the loam cake mechanism 5; And the below of interior crystallizer 1 is arranged in the inside of loam cake mechanism 5 and foundation means 6, make the bottom of said interior crystallizer 1 be positioned at the inboard of said outer crystallizer 2, and the outer crystallizer 2 concentric ring windings of quilt is put; Casting fluidic distributor 8 is assigned as the molten metals in the tundish 7 first-class or multithread imports in the loam cake mechanism 5, said inside and outside crystallizer 1, is filled with molten metal between 2.Opening the initial stage of watering, said cylindrical dummy ingot 10 is arranged on the circular cavity bottom of outer crystallizer 2 belows, and said molten metal forms the round base 4 that solidifies through the cooling of inside and outside crystallizer 1,2, and said round base 4 is positioned on the cylindrical dummy ingot 10.
Wherein, interior crystallizer 1 is meant that for inverted rocket head structure interior crystallizer 1 has columned body, is blunt shape circular cone head at the head of body.
In the present embodiment; The bottom of interior crystallizer 1 is arranged on the inboard center of outer crystallizer 2; Be filled with molten metal between interior crystallizer 1 and the outer crystallizer 2; That is, molten metal interior crystallizer 1 and outside implemented two-way cooling by two crystallizers between the crystallizer 2, after cooling, below two crystallizers, be drawn out with the round base 4 that solidifies.Furthermore, present embodiment adopts interior crystallizer 1 to combine with outer crystallizer 2, and circle base 4 is carried out two-way cooling, and making round base 4 coolings and solidifying adaptable effective thickness increases greatly, thereby can be fit to the manufacturing of the round base of bigger specification.
In the present embodiment, above-mentioned interior crystallizer 1 is fixed together with foundation means 6 through loam cake mechanism 5 with outer crystallizer 2, makes inside and outside crystallizer fix, be provided with one heart with this, so makes the replacing of each parts become and is more prone to make things convenient for.In addition, the whole rocket head crystallizer of present embodiment is soaked among the molten metal, and the crystallizer below has constituted solid strand, can produce the solid strand of different section through the rocket head of changing different-diameter and cone angle.
Referring to shown in Figure 3, said 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 the said water inlet straight catheter 1h; Said backwater conduit 1i comprises backwater straight catheter 1j and the interior crystallizer overcoat 1k that connects up and down; Said interior crystallizer overcoat 1k is V-shaped, and the external packets of said backwater conduit 1i is covered with the first collet 1g; The chilled(cooling) water return (CWR) is arranged on the inside of said interior crystallizer 1.
Said chilled(cooling) water return (CWR) comprises into water loop 1a, water return loop 1b and water hole 1c.Said water inlet loop 1a is positioned at said water inlet straight catheter 1h, and the upper end of said water inlet loop 1a is water inlet 1d; Gap between said water inlet straight catheter 1h and the backwater conduit 1i constitutes said water return loop 1b, and the upper end of said water return loop 1b is water return outlet 1e; Water hole 1c is arranged between the lower end and said interior crystallizer overcoat 1k of said water inlet straight catheter 1h, and said water inlet loop 1a and water return loop 1b are connected through water hole 1c.
Shown in the direction of arrow of Fig. 3, cooling water gets into water inlet loop 1a from water inlet 1d, then flows into water return loop 1b through water hole 1c, flows out from water return outlet 1e again.Wherein, water inlet 1d and water return outlet 1e all are positioned at the upper end of interior crystallizer 1, and the water hole is positioned at the lower end of interior crystallizer 1, and so cooling water flows interior crystallizer 1 in, can cool off near the molten metal of interior crystallizer 1 in the annular molten metal bath 3 fully.
The said first collet 1g comprises high-temperature flame-proof pipe 1m and high strength graphite 1n, and said high-temperature flame-proof pipe 1m is coated on the outside of said backwater straight catheter 1j, and said high strength graphite 1n coats the outside of said interior crystallizer overcoat 1k.In the present embodiment; Backwater straight catheter 1j outer periphery high-temperature flame-proof pipe 1m separates the molten metal and the backwater straight catheter 1j of outside hyperthermia and superheating; High strength graphite 1n is located in outside the interior crystallizer overcoat 1k, and interior crystallizer overcoat 1k and molten metal are separated the effect that interior crystallizer is protected in heat transfer simultaneously of playing.
The top of said interior crystallizer 1 has interior crystallizer flange 1f; Said interior crystallizer 1 is fixed in the said loam cake mechanism 5 through said interior crystallizer flange 1f; Promptly; Position in the interior crystallizer 1 below interior crystallizer flange 1f position is in the endless metal liquid molten bath 3, and the position above interior crystallizer flange 1f position is in outside the endless metal liquid molten bath 3.
Said backwater conduit 1i comprises that also backwater emits conduit 1p; Said backwater emits conduit 1p compartment of terrain to be set in the outside of said water inlet straight catheter; And be connected the top of backwater straight catheter 1j; Said backwater emits conduit to be connected with said water return loop with the gap that intakes between the straight catheter, and said water return outlet 1e is arranged on backwater and emits on the conduit 1p, and said interior crystallizer flange 1f is positioned at the top of said backwater straight catheter 1j.Wherein, said backwater emits conduit 1p directly directly to be connected with backwater straight catheter 1j, for example welding; Perhaps, 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.
Cooperate Fig. 1 and shown in Figure 4; Said outer crystallizer 2 comprises cover 2b and crystallizer copper pipe 2c in the outer crystallizer overcoat 2a that is provided with at interval successively from outside to inside, the outer crystallizer; Be connected with the division board 2d of horizontal placement in the said outer crystallizer between cover 2b and the outer crystallizer overcoat 2a; The medial extremity of said division board 2d connects cover 2b in the outer crystallizer, and outboard end connects outer crystallizer overcoat 2a, and division board 2d can be positioned at outer crystallizer cover 2b on the centre position of short transverse; Have magnetic stirrer 2e between the inside and outside cover of said outer crystallizer 2b, the 2a, said magnetic stirrer 2e is positioned at the top of said division board 2d; Be respectively equipped with water inlet 2f and delivery port 2g on the said outer crystallizer overcoat 2a, said water inlet 2f is positioned at the below of said division board 2d, and delivery port 2g is positioned at the top of division board 2d; The upper and lower end of cover 2b is penetrated with water flow hole 2h respectively in the said outer crystallizer; Be provided with the second collet 2i with said strand 4 junctions on the said outer crystallizer 2, promptly the second collet 2i is positioned at the inboard of outer crystallizer 2.
Wherein, Said outer crystallizer 2 can be connected on the said foundation means 6 through outer crystallizer flange 2j, and herein, outer crystallizer flange 2j is connected the top of crystallizer copper pipe 2c; Outer crystallizer flange 2j combines with the second pedestal flange 6g, so that outer crystallizer 2 is connected on the foundation means 6.The said second collet 2i can be high strength graphite.Magnetic stirrer 2e is disposed in the outer crystallizer 2, can carry out fragmentation, stir to form a large amount of nucleus crystal grain.
In the present embodiment, have the gap between the inside and outside cover of outer crystallizer 2b, the 2a, division board 2d is separated into up and down two independently spaces with the interval between inside and outside cover 2b, the 2a; Has the gap between cover 2a and the crystallizer copper pipe 2c in the outer crystallizer.Shown in the direction of arrow among Fig. 4; The gap of cooling water below between the inside and outside cover of crystallizer 2b, the 2a outside water inlet 2f gets into; Overlap the gap between 2a and the crystallizer copper pipe 2c in the crystallizer outside then the water flow hole 2h of 2a lower end flows in outer crystallizer; Then the water flow hole 2h through 2a upper end in the outer crystallizer flows in the gap of the top between inside and outside cover 2b, the 2a, then flows out from delivery port 2g again.Cooling water flows in the crystallizer 2 outside, carry out heat exchange with outer crystallizer 2 inner molten metals after, flow out hot water from delivery port 2g.
According to the embodiment of the utility model, like Fig. 6 and shown in Figure 7, said loam cake mechanism 5 comprises the loam cake housing 5a that is Jiong shape, and the bottom outside of said loam cake housing 5a is connected with the first loam cake flange 5b, is used for connecting said foundation means 6.The bottom of said loam cake housing 5a is connected with adiabatic heat-insulation lining body 5c.The central shaft of said loam cake mechanism 5 is provided with interior crystallizer perforation 5d to running through; Axially run through in the said loam cake mechanism 5 and be provided with the mouth of a river and penetrate hole 5e; The said mouth of a river penetrates the outside that hole 5e is positioned at said interior crystallizer perforation 5d; The position of the corresponding interior crystallizer perforation in the top of said loam cake housing 5a 5d is provided with the second loam cake flange 5f, is used for connecting said interior crystallizer 1.In the present embodiment; Interior crystallizer 1 passes interior crystallizer perforation 5d and is fixed on the second loam cake flange 5f, and interior crystallizer 1 and loam cake mechanism 5 are combined, and molten metal penetrates hole 5e and flows in the loam cake mechanism 5 from the mouth of a river; Simultaneously, the mouth of a river penetrates the situation that hole 5e can be used for observing liquid level.Herein, around interior crystallizer perforation 5d, be provided with two equally distributed mouths of a river and penetrate hole 5e.
Bottom at said adiabatic heat-insulation lining body 5c; Be provided with slag trap 5g from the edge extension tangentially laterally of said interior crystallizer perforation 5d; The molten metal that slag trap 5g will be distributed in the endless metal liquid molten bath 3 separates with the upper strata scum silica frost; As shown in Figure 9, have two slag trap 5g herein.Axially run through to be provided with in the said loam cake mechanism 5 and diffuse hole 5h; Saidly diffuse the outside that hole 5h is positioned at said interior crystallizer perforation 5d; Be provided with on the top of said loam cake housing 5a and cover the adiabatic cover plate 5i that diffuses hole 5h upper end said, adiabatic cover plate 5i can avoid heats in the endless metal liquid molten bath 3 from diffusing hole 5h diffusion.Herein; Around interior crystallizer perforation 5d, be provided with two equally distributed hole 5h that diffuse; Diffuse hole 5h and be used for discharging the gas that produces and bring in casting initial stage and casting cycle endless metal liquid molten bath 3 die cavities, in addition, diffusing the hole can also be as observation, thermometer hole etc.
As shown in Figure 7; Said adiabatic heat-insulation lining body 5c comprises fire-resistant stamp mass 5j and adiabatic refractory lining 5k; Said adiabatic refractory lining 5k is connected the bottom of the inner chamber of said loam cake housing 5a, fills said fire-resistant stamp mass 5j between said loam cake housing 5a and the said adiabatic refractory lining 5k.After interior crystallizer 1 inserted interior crystallizer perforation 5d, fire-resistant stamp mass 5j and adiabatic refractory lining 5k were enclosed in interior crystallizer 1 with being upper-lower position respectively and are in the position in the loam cake mechanism 5.
Like Fig. 8 and shown in Figure 9; Said foundation means 6 comprises the base housing 6a that is concave shape; The top outer of said base housing is connected with the first pedestal flange 6b that is used for connecting said loam cake mechanism, and said first pedestal flange and the said first loam cake flange 5b be through the fastening connection piece secure bond, and then loam cake mechanism 5 is fixed together with foundation means 6; Wherein, fastening connection piece can for example be the combination of flange bolt 5m and flange nut 6j.Said base housing 6a is provided with refractory lining body 6c; The central shaft of said foundation means 6 is provided with pedestal centre bore 6d to running through, and the position of the bottom of said base housing 6a corresponding pedestal centre bore 6d is provided with the second pedestal flange 6g that is used for connecting said outer crystallizer 2.
Said foundation means 6 tops offer the tangent line ingate 6h with said pedestal centre bore arranged tangential, and it is corresponding that the outer end of said tangent line ingate and the above-mentioned mouth of a river penetrate hole 5e, and inner and said pedestal centre bore 6d is connected.
Said foundation means bottom is positioned at said outer crystallizer top loop and is provided with variable frequency induction coil 6e, and the variable frequency induction coil encircling is provided with coil protect cover 6f in the outside of said pedestal centre bore 6d outside the variable frequency induction coil 6e.Wherein, can separate 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 that auxiliary stirrings, broken primary grain, homogenising internal and external temperature and outwards heat transfer are arranged, and the forming core core is delivered to the effect of core, in the throwing later stage; Adopt power frequency or intermediate frequency, be used to remain molten steel heating, insulation effect.In addition, the external frequency induction coil 6e and 6f coil protection cover can be enclosed inside a magnetic astatine guide magnet 6p.
Be axially arranged with slag-drip opening 3a on the said foundation means 6, said slag-drip opening is connected with trough 6i with above-mentioned to diffuse hole 5h corresponding between said slag-drip opening and said pedestal centre bore 6d.Herein, have two equally distributed tangent line ingate 6h, and have two equally distributed trough 6i.
In the present embodiment; The molten metal that gets into loam cake mechanism 5 gets into foundation means 6 from tangent line ingate 6h; Tangent line ingate 6h changes molten metal into along annular housing tangential direction from vertical direction; The back moves in a circle along annular housing, and the liquid slag that swims in the molten metal top is blocked by the slag trap 5g in the loam cake mechanism 5 in company with the molten metal rotary course, and flows out slag-drip opening 3a along trough 6i.
In addition, wherein as shown in Figure 1, during installation, can foundation means 6 be installed on the 3b of steel construction basis, storage slag pan 3c can be placed in the position of corresponding slag-drip opening 3a on the 3b of steel construction basis, makes the scum silica frost of discharging from slag-drip opening 3a fall into storage slag pan 3c.
Said refractory lining body 6c comprises high-temperature flame-proof lining 6k; Carbon fire-resistance brick lining 6m and knotting refractory matter 6n; Said high-temperature flame-proof lining 6k is located at the top of the inner chamber of said base housing 6a; Said carbon fire-resistance brick lining 6m is located at the bottom of said high-temperature flame-proof lining 6k and is positioned at around the said pedestal centre bore 6d, and said knotting refractory matter 6n is filled between said high-temperature flame-proof lining 6k and the base housing 6a, and is positioned at the outside of said coil protect cover 6f.That is to say; 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 coil protect cover 6f; High-temperature flame-proof lining 6k and carbon fire-resistance brick lining 6m constitute pedestal internal layer working lining, are filled by knotting refractory matter 6n between base housing 6a and the pedestal internal layer working lining.
Like Fig. 1 and shown in Figure 5, said casting device also comprises second water-cooling system 9, and said second water-cooling system 9 is connected the below of said outer crystallizer 2, and said second water-cooling system 9 comprises outer two water-cooled ejection assemblies 9a and secondary cooling zone foot roller 9e.Said outer two water-cooled ejection assemblies 9a comprise the how exclusive di-cold spray nozzle ring group 9b that axially is provided with along circle base 4; Every exclusive di-cold spray nozzle ring group 9b has two water-cooled nozzle 9c outside blank excircle Zhou Junbu a plurality of, 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; So that the current that outer two water-cooled nozzle 9c eject spray to round base 4 as much as possible; And can not blocked by secondary cooling zone foot roller 9e, secondary cooling zone foot roller 9e can be used to the red heat strand 4 that clamping has the liquid core.
In the present embodiment; The outer two water-cooled nozzle 9c of outer two water-cooled ejection assemblies 9a are used to continue to cool off the strand outer surface of crystallizer; Outer two water-cooled ejection assemblies 9a have comprised the nine exclusive two water-cooled nozzle ring group 9b that are provided with along the length direction of circle base 4, and figure is signal just, and nozzle number is looked cooling length can be 5～50 rows; Each outer two water-cooled nozzle ring group 9b has a plurality of outer two water-cooled nozzle 9c; The quantity of outer two water-cooled nozzle 9c can be as required and the diameter of circle base 4 decide, herein, each outer two water-cooled nozzle ring group 9b has 6～12 outer two water-cooled nozzle 9c.
As shown in Figure 1, said tundish 7 can be the tundish that adopts the electromagnetism heating, and the bottom of tundish 7 has and goes out the molten steel mouth; The top of casting fluidic distributor 8 has one and connects the molten steel mouth; The bottom of casting fluidic distributor 8 can be evenly distributed with 1 to 4 isocon 8a, and the quantity of isocon 8a is identical with the quantity that the mouth of a river of loam cake mechanism 5 penetrates hole 5e, herein; Have two isocon 8a; That is, herein, casting fluidic distributor 8 is assigned as 180 ° of two conductance of symmetry with the current in the tundish 7 and goes in the loam cake mechanism 5; Certainly, as required, that casting fluidic distributor 8 also can be assigned as the current in the tundish 7 is first-class, three streams or three streams are above imports in the loam cake mechanism 5.
Outside said, be equipped with many row foldings below the crystallizer 2 and hold guide roller 12, be used for the red heat strand 4 that has the liquid core that clamping come out by interior crystallizer 1 and outer crystallizer 2.
Said casting device also comprises up-down push rod 11, and said up-down push rod 11 is connected the bottom of said cylinder dummy ingot 10, and drives cylindrical dummy ingot 10 and move up and down.In the present embodiment, opening the initial stage of watering, cylindrical dummy ingot 10 is sealed the circular cavity bottom of said outer crystallizer 2 belows, and along with the carrying out of casting, the cylindrical dummy ingot 10 of up-down push rod 11 drag down is deviate from casting blank shell from crystallizer.
In addition; Up-down push rod 11 also can be done periodically up-down vibration in the cylindrical dummy ingot 10 of drag down; The inside and outside relatively crystallizer of casting blank shell is moved up and down; Play the purpose that casting blank shell and inside and outside crystallizer 1,2 more are prone to shelling, and base shell and 1 relative motion up and down of interior crystallizer, play tamping central tissue under the semisolid, eliminate central pipe, fluffing action.
Shown in figure 10, in strand and the whole tamping cycle up and down of base shell, available following four-stage process is described:
Shown in Figure 10 (a), the phase I: be original state, be apart from the elongation process this moment between the solid solid phase of interior crystallizer 1 and below; High-temperature liquid-phase with the top; Be that hyperthermia and superheating molten metal 4c puts into V molten bath, center, in casting cavity, between hyperthermia and superheating molten metal 4c and normal strand 4, be followed successively by from the top down; The mistake sluggish metal 4d of a large amount of nucleus of enrichment (solid phase ratio 0-30%), first semisolid two-phase section 4e (solid phase ratio 60-90%) and closely knit high temperature solid-state 4g;
Shown in Figure 10 (b); Second stage: be first to solidify the forming core stage; The mistake sluggish metal 4d (solid phase ratio 0-30%) for a large amount of nucleus of enrichment in molten bath, entering center received the heat transfer of below and side and cooled off by the heat transfer of top and inboard interior crystallizer 1 this moment; Formation near the following following V-type solid-liquid two-phase region 4e of solidifying body (solid phase ratio >=60-90%) and near the last V-type solid-liquid two-phase region 4f of last V-type interior crystallizer, last V-type solid-liquid two-phase region 4f also claims the second semisolid two-phase section (solid phase ratio 30-60%);
Shown in Figure 10 (c), the phase III: be second to 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 in the middle of simultaneously constantly dwindles, and last upper and lower solid-liquid two-phase region is tending towards merging;
Shown in Figure 10 (d); Stage: be the semisolid pressing stage, distance shortens relatively between the solid solid phase 4g in interior crystallizer 1 and below, promptly relies on the relative compressional movement of strand 4 and interior crystallizer 1; Semisolid Mushy Zone pressing with the middle part; Make the loose hole compacting of association in two-phase section, play the purpose of eliminating loose shrinkage cavity, the whole period of motion finishes; Distance is drawn back once more and is got into next circulation between the solid solid phase in interior crystallizer and below.
In addition; The relative motion up and down of interior crystallizer 1 and casting blank shell; Be the method for the relative motion between the solid solid phase 4g in interior crystallizer 1 and below, in the cylindrical dummy ingot 10 of drag down, also can do periodically up-down vibration, make outside the inside and outside relatively crystallizer of casting blank shell moves up and down except above-mentioned up-down push rod; It is following also to have method: can realize that the inside and outside crystallizer 1,2 on top is motionless together with foundation means 6, loam cake mechanism 5 through moving up and down of drawing billet mechanism; Perhaps, can drag foundation means 6 and carry out periodic motion realization up and down through being installed in the hydraulic vibration mechanism between the 3b of steel construction basis with inside and outside crystallizer 1,2; Perhaps, can move up and down through the periodicity that is installed in the elevating mechanism driving interior crystallizer 1 on the interior crystallizer flange 1f in the loam cake mechanism 5.Wherein, drawing billet mechanism, hydraulic vibration mechanism and elevating mechanism are well known to those skilled in the art, and repeat no more at this.
As shown in Figure 1, the operating process of explanation the utility model embodiment below:
(1) assembling: as shown in Figure 3, accomplish each subassembler and do, and dummy ingot 10 is arranged in the below cavity of interior crystallizer 1 and outer crystallizer 2, and handle peripheral slit, can treat the material casting;
(2) casting: qualified molten steel is winched to tundish 7 tops; Open steel ladle mouth of a river control system; The molten steel amounts in the tundish 7 of treating reach the liquid outlet that tundish 7 is opened in 80% back, and molten steel respectively introduces each other via casting fluidic distributor 8 from the molten steel mouth that goes out of tundish 7 that the mouth of a river of the loam cake mechanism 5 of 180 degree penetrates the 5e of hole, and molten steel is then rotating the round base that gets into foundation means 6 by tangent line ingate 6h and casting in the chamber; Molten metal moves in a circle in the casting chamber; The scum silica frost that swims on the metal bath surface leans on difference in specific gravity to realize that steel, slag separate in rotary course, and is installed in the slag trap 5g separation in the loam cake mechanism 5 and gets into trough 6i, discharges from slag-drip opening 3a;
Molten metal receives the cooled and solidified of interior crystallizer 1 and outer crystallizer 2 and forms the base shell; The base shell passes through dummy ingot 10 in downward throwing; Up-down push rod 11 drives dummy ingot, the relative crystallizer 1,2 of strand is done up-down vibration, and base shell and crystallizer are broken away from, and under casting speed, moves down gradually; Base shell progressive additive forms in crystallizer along the V-type solidified shell and the core V-type liquid core of inside and outside crystallizer 1,2 both sides simultaneously; In the middle of base shell that the base shell is pulled out inside and outside crystallizer moment red heat is exposed to air, get into second water-cooling system 9;
(3) cooling control: get into the big section casting blank of the red heat that has the liquid core of second water-cooling system 9, outer surface receives the cooling from the outer two water-cooled nozzle 9c of outer crystallizer 2 belows, and temperature descends gradually, and liquid core ratio is decreased to the V-type bottom gradually and is completed into solid;
(4) electromagnetic agitation and heating stop watering: after over-heat metal liquid injects die cavity, descended by chilled(cooling) water return (CWR) and the chilling temperature of variable frequency induction coil 6e on interior crystallizer 1 and the outer crystallizer 2, on the inner chamber of the face of cylinder, form faint solidification layer or mistake 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 the cold metal layer, mixes crossing the liquid of sluggish metal with liquid middle part higher temperatures, promotes non-homogeneous core amounts in the molten metal; The casting later stage; Cooperate pulling rate to reduce gradually; Until stopping drawing, feeding liquid in top only is used for replenishing V-type liquid core and solidifies requiredly when being equal to rising head that part of, and the operating frequency of variable frequency induction coil 6e changes power frequency or intermediate frequency continued power into; This moment, water-cooled variable frequency induction coil 6e served as the effect of eddy-current heating holding furnace, played the riser head heat-preserving heats;
Subsequently; Along with the liquid core constantly reduces, when liquid core end progressively gets in the crystallizer, progressively reduce the cooling water in the interior crystallizer 1; And slowly promote interior crystallizer 1 residual metallic liquid in variable frequency induction coil 6e and all get in the base shell; Extract interior crystallizer 1 fully, covering insulation material above residual metallic liquid is until solidifying fully;
(5) take off ingot:, steel billet will be solidified through hot hard iron and from casting system, take out in normal continuous casting process in complete solidification zone lower end, and realize continuous billet casting; After also can casting certain-length continuously, stop casting till residual metallic liquid solidifies fully (stopping in as above-mentioned (4) watered step), at last whole ingot blank is once taken out, realize semicontinuous strand.
The utility model embodiment compares with conventional method and has the following advantages:
1, because the utility model embodiment adopts the special fixed form of loam cake mechanism 5, foundation means 6 and center interior crystallizer 1, make inside and outside crystallizer 1,2 fixing, change to become and be more prone to convenient with one heart.
2, because the utility model embodiment adopts the two-way cooling of 1,2 pairs of strands of inside and outside crystallizer, make the strand cooling, solidify adaptable effective thickness and increase greatly, the strand diameter that can cast and conventional method thicken nearly one times.
3, because the solid strand of the utility model embodiment has adopted the structure of special rocket head interior crystallizer 1 and special core semisolid to make debulking methods firm by ramming; Played to force to roll and closed central pipe, loose; Played decisive role to eliminating big section center coagulation defect, compared with traditional casting billet surface liquid core soft reduction method that mechanism is simple more, effect is more obvious.
4, because the utility model embodiment adopts vertical casting throwing method, it is inconsistent to have avoided big section circle base horizontal casting circumference to solidify up and down, and impurity or be segregated in the deficiency that the first half is assembled has guaranteed the uniformity of whole slab quality.
5, because the utility model embodiment casting system has adopted bitangent formula ingate structure; Molten metal rotates into die cavity from tangent line ingate 6h; Avoided whole section particularly large section casting temperature, solidify inconsistent phenomenon, utilize the slag difference in specific gravity to separate the slag effect simultaneously in addition.
6, because the utility model embodiment is provided with slag iron skimming baffle mechanism on the track of loam cake molten metal rotation, promptly have slag trap 5g, can effectively realize separating, discharging of scum silica frost and clean metal liquid.
7, because the inside and outside crystallizer 1,2 of the utility model embodiment has all adopted the compound working lining of high strength graphite, can effectively play the effect of protection copper sheathing crystallizer, the auxiliary effect of lubricated shelling is arranged, can realize the casting of unprotect slag.
8, because the utility model embodiment is provided with variable frequency induction coil 6e; Realized the advantageous effect of normal productive process electromagnetic agitation, crystal grain thinning, adjustment chamber inner metal liquid temperature; Cooperate the variation of tail base casting speed; Play tail base rising head heat tracing simultaneously, shortened the shrinkage cavity of tail base, the draw, improved the important result of strand lumber recovery.
In sum; Because the application of above measure; Make the continuous casting of the solid strand of large section of the utility model embodiment no longer receive the restriction of specifications section; Second water-cooling system and half solid phase of inside and outside crystallizer cooling system, surfaces externally and internally water spray are made method, the effect of variable frequency induction coil tail base heat tracing firm by ramming, have played the effect that improves casting quality, improves lumber recovery.
The casting method of the casting device of the utility model embodiment, it comprises step:
A, interior crystallizer 1, outer crystallizer 2, loam cake mechanism 5 and foundation means 6 are provided; The inside of foundation means and loam cake mechanism 5 is interconnected, and loam cake mechanism 5 is fixedly connected up and down with foundation means 6; Outer crystallizer 2 is fixedly connected on the below of said foundation means 6; Interior crystallizer 1 is inverted rocket head-like structure; Interior crystallizer 1 is fixedly connected in the said loam cake mechanism 5; And the below of interior crystallizer 1 is arranged in the inside of said loam cake mechanism 5 and foundation means 6; Make the bottom of said interior crystallizer 1 be positioned at the inboard of said outer crystallizer 2, and put by said outer crystallizer 2 concentric ring windings;
B, section is provided is the cylindrical dummy ingot 10 and the up-down push rod 11 of filled circles shape, and up-down push rod 11 is connected the bottom of cylindrical dummy ingot, and drives dummy ingot and move up and down, and said cylindrical dummy ingot is arranged on the cavity bottom of said outer crystallizer 2 belows;
C, molten metal is introduced in the loam cake mechanism 5; And then molten metal is filled between said interior crystallizer 1 and the outer crystallizer 2; Molten metal forms the base shell through the two-way cooling of interior crystallizer 1 and outer crystallizer 2; The push rod that goes up and down simultaneously drives cylindrical dummy ingot and moves downward, and makes simultaneously and produces periodic relative motion up and down between base shell and the inside and outside crystallizer; Relative motion up and down between base shell and the interior crystallizer is played the effect of making firm by ramming to the base shell, and the outer surface of base shell and the effect of outer crystallizer shelling are played in the relative motion up and down between base shell and the outer crystallizer;
D, along with the progressive additive of base shell, form the round base that solidifies.
Furthermore, make the method that produces relative motion periodically up and down between base shell and the interior crystallizer have following several kinds among the said step C:
When (1) the said cylindrical dummy ingot 10 of said up-down push rod 11 drives being moved downward, make up-down push rod 11 drive cylindrical dummy ingot 10 and move up and down, make base shell and inside and outside crystallizer 1, produce relative motion periodically up and down between 2; At this moment, inside and outside crystallizer 1,2 is motionless together with foundation means 6, loam cake mechanism 5.
(2) on cylindrical dummy ingot 10, drawing billet mechanism is set in addition, drives cylindrical dummy ingot 10 through drawing billet mechanism and move up and down, make base shell and inside and outside crystallizer 1, produce relative motion periodically up and down between 2; At this moment, inside and outside crystallizer 1,2 is motionless together with foundation means 6, loam cake mechanism 5.
(3) on said interior crystallizer 1, elevating mechanism is set, elevating mechanism driving interior crystallizer 1 is done periodically and is moved up and down.Perhaps,
(4) hydraulic vibration mechanism is installed on the 3b of steel construction basis, drags foundation means 6 through hydraulic vibration mechanism and carry out periodicity with inside and outside crystallizer 1,2 and move up and down.
The above is merely several embodiment of the utility model, and those skilled in the art can carry out various changes or modification to the utility model embodiment and do not break away from the spirit and the scope of the utility model according to application documents are disclosed.
Claims (18)
1. the continuous casting apparatus of one kind big section circle base is characterized in that said casting device comprises interior crystallizer (1); Outer crystallizer (2), loam cake mechanism (5), foundation means (6); Section is the cylindrical dummy ingot (10) of filled circles shape, the tundish (7) of band heating and casting fluidic distributor (8); Foundation means (6) is interconnected with the inside of loam cake mechanism (5), and loam cake mechanism (5) is fixedly connected up and down with foundation means (6); Outer crystallizer (2) is fixedly connected on the below of said foundation means (6); Said interior crystallizer (1) is inverted rocket head-like structure; Interior crystallizer (1) is fixedly connected in the loam cake mechanism (5); And the below of interior crystallizer (1) is arranged in the inside of loam cake mechanism (5) and foundation means (6); Make the bottom of said interior crystallizer (1) be positioned at the inboard of outer crystallizer (2); And put by outer crystallizer (2) concentric ring winding, said casting fluidic distributor (8) be assigned as the molten metal in the tundish (7) first-class or multithread importing loam cake mechanism (5) in, be filled with molten metal between said interior crystallizer (1) and the outer crystallizer (2); Opening the initial stage of watering, said cylindrical dummy ingot (10) is arranged on the circular cavity bottom of outer crystallizer (2) below, and said molten metal forms the round base (4) that solidifies through the cooling of inside and outside crystallizer (1,2), and said round base is positioned on the cylindrical dummy ingot (10).
2. the continuous casting apparatus of big section circle base according to claim 1 is characterized in that said 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 the said water inlet straight catheter, and said backwater conduit comprises backwater straight catheter and the interior crystallizer overcoat that connects up and down, and said interior crystallizer overcoat is V-shaped, and the external packets of said backwater conduit is covered with first collet; The chilled(cooling) water return (CWR) is arranged on the inside of said interior crystallizer.
3. the continuous casting apparatus of big section circle base according to claim 2 is characterized in that said 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 said water inlet straight catheter, and the upper end in said water inlet loop (1a) is water inlet (1d); Gap between said water inlet straight catheter (1h) and the backwater conduit (1i) constitutes said water return loop (1b), and the upper end of said water return loop (1b) is water return outlet (1e); Water hole (1c) is arranged between the lower end and said interior crystallizer overcoat (1k) of said water inlet straight catheter (1h), and said water inlet loop (1a) and water return loop (1b) are connected through water hole (1c).
4. the continuous casting apparatus of big section circle base according to claim 2; It is characterized in that; Said first collet (1g) comprises high-temperature flame-proof pipe (1m) and high strength graphite (1n); Said high-temperature flame-proof pipe (1m) is coated on the outside of said backwater straight catheter (1j), and said high strength graphite (1n) coats the outside of said interior crystallizer overcoat (1k).
5. the continuous casting apparatus of big section circle base according to claim 2; It is characterized in that; The top of said interior crystallizer (1) has interior crystallizer flange (1f), and said interior crystallizer (1) is fixed in the said loam cake mechanism (5) through said interior crystallizer flange (1f).
6. the continuous casting apparatus of big section circle base according to claim 2; It is characterized in that; Said backwater conduit (1i) comprises that also backwater emits conduit (1p); Said backwater emits conduit (1p) compartment of terrain to be set in the outside of said water inlet straight catheter, and is connected the top of backwater straight catheter (1j), and said backwater emits conduit to be connected with said water return loop with the gap that intakes between the straight catheter; Said water return outlet (1e) is arranged on backwater and emits on the conduit (1p), and said interior crystallizer flange (1f) is positioned at the top of said backwater straight catheter (1j).
7. the continuous casting apparatus of big section circle base according to claim 1; It is characterized in that; Said loam cake mechanism (5) comprises the loam cake housing (5a) that is Jiong shape; The bottom outside of said loam cake housing (5a) is connected with the first loam cake flange (5b) that is used for connecting said foundation means (6), and the inner chamber of said loam cake housing (5a) has been built adiabatic heat-insulation lining body (5c) by laying bricks or stones; The central shaft of said loam cake mechanism (5) is provided with interior crystallizer perforation (5d) to running through; Axially run through in the said loam cake mechanism (5) and be provided with the mouth of a river and penetrate hole (5e); The said mouth of a river penetrates the outside that hole (5e) is positioned at said interior crystallizer perforation (5d), and the position of the corresponding interior crystallizer perforation in the top of said loam cake housing (5a) (5d) is provided with the second loam cake flange (5f) that is used for connecting said interior crystallizer (1).
8. the continuous casting apparatus of big section circle base according to claim 7 is characterized in that, in the bottom of said adiabatic heat-insulation lining body (5c), tangentially extends laterally from the edge of said interior crystallizer perforation (5d) and to be provided with slag trap (5g); Axially run through in the said loam cake mechanism (5) to be provided with and diffuse hole (5h), saidly diffuse the outside that hole (5h) is positioned at said interior crystallizer perforation (5d), be provided with on the top of said loam cake housing (5a) and cover the adiabatic cover plate (5i) that diffuses upper end, hole (5h) said.
9. the continuous casting apparatus of big section circle base according to claim 7; It is characterized in that; Said adiabatic heat-insulation lining body (5c) comprises fire-resistant stamp mass (5j) and adiabatic refractory lining (5k); Said adiabatic refractory lining (5k) is connected the bottom of the inner chamber of said loam cake housing (5a), fills said fire-resistant stamp mass (5j) between said loam cake housing (5a) and the said adiabatic refractory lining (5k).
10. the casting device of big section circle base according to claim 1; It is characterized in that; Said foundation means (6) comprises the base housing (6a) that is concave shape; The top outer of said base housing is connected with the first pedestal flange (6b) that is used for connecting said loam cake mechanism, and said first pedestal flange and the said first loam cake flange (5b) are through the fastening connection piece secure bond, and said base housing is provided with refractory lining body (6c); The central shaft of said foundation means is provided with pedestal centre bore (6d) to running through, and the position of the corresponding pedestal centre bore in the bottom of said base housing (6a) is provided with the second pedestal flange (6g) that is used for connecting said outer crystallizer (2).
11. the casting device of big section circle base according to claim 10; It is characterized in that; Said foundation means (6) top offers the tangent line ingate (6h) with said pedestal centre bore arranged tangential; It is corresponding that the outer end of said tangent line ingate and the above-mentioned mouth of a river penetrate hole (5e), and inner and said pedestal centre bore (6d) is connected.
12. the casting device of big section circle base according to claim 10; It is characterized in that; Said foundation means bottom; Be positioned at said outer crystallizer top loop and be provided with variable frequency induction coil (6e), the variable frequency induction coil encircling is provided with coil protect cover (6f) in the outside of said pedestal centre bore outside the variable frequency induction coil.
13. the casting device of big section circle base according to claim 10; It is characterized in that; Be axially arranged with slag-drip opening (3a) on the said foundation means (6), said slag-drip opening is corresponding with the above-mentioned hole (5h) of diffusing, and between said slag-drip opening and said pedestal centre bore (6d), is connected with trough (6i).
14. the continuous casting apparatus of big section circle base according to claim 12; It is characterized in that; Said refractory lining body (6c) comprises high-temperature flame-proof lining (6k); Carbon fire-resistance brick lining (6m) and knotting refractory matter (6n), said high-temperature flame-proof lining (6k) is located at the top of the inner chamber of said base housing (6a), and said carbon fire-resistance brick lining (6m) is located at the bottom of said high-temperature flame-proof lining (6k) and is positioned at said pedestal centre bore (6d) on every side; Said knotting refractory matter (6n) is filled between said high-temperature flame-proof lining (6k) and the base housing (6a), and is positioned at the outside of said coil protect cover (6f).
15. the continuous casting apparatus of big section circle base according to claim 1; It is characterized in that; Said casting device also comprises second water-cooling system (9); Said second water-cooling system (9) is connected the below of said outer crystallizer (2), and said second water-cooling system (9) comprises outer two water-cooled ejection assemblies (9a) and secondary cooling zone foot roller (9e); Said outer two water-cooled ejection assemblies (9a) comprise the how exclusive di-cold spray nozzle ring group (9b) that axially is provided with along strand (4); Every exclusive di-cold spray nozzle ring group (9b) have along the strand excircle be uniformly distributed with a plurality of outside two water-cooled nozzle (9c), 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 to have the red heat circle base (4) of liquid core.
16. the continuous casting apparatus of big section circle base according to claim 5 is characterized in that said interior crystallizer flange (1f) is provided with elevating mechanism, said elevating mechanism drives said interior crystallizer (1) and periodically moves up and down.
17. the continuous casting apparatus of big section circle base according to claim 1; It is characterized in that; Said casting device also comprises up-down push rod (11), and said up-down push rod (11) is connected the bottom of said cylindrical dummy ingot (10), and drives cylindrical dummy ingot and move up and down.
18. the continuous casting apparatus of big section circle base according to claim 1 is characterized in that crystallizer outside said (2) below is equipped with many row foldings and holds guide roller (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220276360 CN202571213U (en) | 2012-06-12 | 2012-06-12 | Continuous casting device for large-section round billet |
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| CN 201220276360 CN202571213U (en) | 2012-06-12 | 2012-06-12 | Continuous casting device for large-section round billet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773427A (en) * | 2012-06-12 | 2012-11-14 | 中冶京诚工程技术有限公司 | Continuous casting device and method of large-section round billet |
| WO2020249004A1 (en) * | 2019-06-12 | 2020-12-17 | 宝山钢铁股份有限公司 | Electromagnetic stirring device and method for secondary cooling zone during slab continuous casting |
-
2012
- 2012-06-12 CN CN 201220276360 patent/CN202571213U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773427A (en) * | 2012-06-12 | 2012-11-14 | 中冶京诚工程技术有限公司 | Continuous casting device and method of large-section round billet |
| CN102773427B (en) * | 2012-06-12 | 2015-04-22 | 中冶京诚工程技术有限公司 | Continuous casting device and method of large-section round billet |
| WO2020249004A1 (en) * | 2019-06-12 | 2020-12-17 | 宝山钢铁股份有限公司 | Electromagnetic stirring device and method for secondary cooling zone during slab continuous casting |
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