CN102773427A - Continuous casting device and method for large-section round billet - Google Patents
Continuous casting device and method for large-section round billet Download PDFInfo
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- CN102773427A CN102773427A CN2012101936772A CN201210193677A CN102773427A CN 102773427 A CN102773427 A CN 102773427A CN 2012101936772 A CN2012101936772 A CN 2012101936772A CN 201210193677 A CN201210193677 A CN 201210193677A CN 102773427 A CN102773427 A CN 102773427A
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Abstract
A continuous casting device of round billets with large cross sections and a casting method thereof are disclosed, the device comprises an inner crystallizer, an outer crystallizer, an upper cover mechanism, a base mechanism, a cylindrical dummy ingot device with solid round cross sections, a tundish with heating and a casting flow distributor; the base mechanism is communicated with the inside of the upper cover mechanism and is fixed up and down; the outer crystallizer is fixed below the base mechanism; the inner crystallizer is of an inverted arrow-head-shaped structure, the inner crystallizer is fixedly connected to the upper cover mechanism, the lower part of the inner crystallizer penetrates through the upper cover mechanism and the inner part of the base mechanism, the lower part of the inner crystallizer is positioned at the inner side of the outer crystallizer and concentrically surrounded by the outer crystallizer, the molten metal in the tundish is distributed into one stream or multiple streams by the casting flow distributor and is led into the upper cover mechanism, and the molten metal is filled between the inner crystallizer and the outer crystallizer; in the initial casting stage, the cylindrical dummy ingot device is arranged at the bottom of the circular cavity below the outer crystallizer, the molten metal is cooled by the inner crystallizer and the outer crystallizer to form a solidified circular billet, and the circular billet is positioned on the cylindrical dummy ingot device.
Description
Technical Field
The invention relates to a continuous casting device and a continuous casting method for a large-section round billet.
Background
Along with the development of industries such as petroleum, chemical industry, wind power, nuclear power and the like, the requirements of large-diameter tubular blanks, cylindrical blanks, annular blanks and large-section high-quality solid ingot blanks are continuously increased, the requirements of quality, efficiency and cost cannot be met by the traditional ingot casting forging and hole punching and hole expanding technology, along with the increase of the section diameter of a casting, the center is loose, the shrinkage cavity and segregation are worsened, the yield is low (50-65%), the production efficiency is low, and the like, and the development of the industry is severely restricted.
The continuous casting technology is influenced by large-section heat transfer, the internal quality and the production efficiency of a casting blank are obviously reduced along with the increase of the diameter of the section, and even if the liquid core soft reduction technology is further increased along with the diameter, the transmission of the deformation of the surface layer of the round blank to the center becomes weaker and weaker, so that the solid continuous casting blank with the diameter of more than 1000mm becomes a forbidden zone which is difficult to exceed in continuous casting.
Disclosure of Invention
The invention aims to provide a continuous casting device of a large-section round billet and a casting method thereof, which are suitable for manufacturing a large-size solid casting billet.
The above object of the present invention can be achieved by the following technical solutions:
a continuous casting device of a large-section round billet comprises an inner crystallizer, an outer crystallizer, an upper cover mechanism, a base mechanism, a cylindrical dummy ingot device with a solid round section, a tundish with a heater and a casting flow distributor; the base mechanism is communicated with the inner part of the upper cover mechanism, and the upper cover mechanism is fixedly connected with the base mechanism up and down; the outer crystallizer is fixedly connected below the base mechanism; the inner crystallizer is of an inverted arrowhead-shaped structure, the inner crystallizer is fixedly connected to the upper cover mechanism, the lower part of the inner crystallizer penetrates through the upper cover mechanism and the inner part of the base mechanism, the lower part of the inner crystallizer is positioned at the inner side of the outer crystallizer and concentrically surrounded by the outer crystallizer, the molten metal in the tundish is distributed into one stream or multiple streams by the casting flow distributor and is guided into the upper cover mechanism, and the molten metal is filled between the inner crystallizer and the outer crystallizer; in the initial casting stage, the cylindrical dummy ingot device is arranged at the bottom of the circular cavity below the outer crystallizer, the molten metal is cooled by the inner crystallizer and the outer crystallizer to form a solidified circular billet, and the circular billet is positioned on the cylindrical dummy ingot device.
A continuous casting method of a large-section round billet comprises the following steps:
A. providing an inner crystallizer, an outer crystallizer, an upper cover mechanism and a base mechanism; the base mechanism is communicated with the inner part of the upper cover mechanism, and the upper cover mechanism is fixedly connected with the base mechanism up and down; the outer crystallizer is fixedly connected below the base mechanism; the inner crystallizer is of an inverted arrow-head-shaped structure, the inner crystallizer is fixedly connected to the upper cover mechanism, the lower part of the inner crystallizer penetrates through the upper cover mechanism and the inner part of the base mechanism, and the lower part of the inner crystallizer is positioned at the inner side of the outer crystallizer and is concentrically surrounded by the outer crystallizer;
B. providing a cylindrical dummy ingot device with a solid round section and a lifting push rod, wherein the lifting push rod is connected to the bottom of the cylindrical dummy ingot device and drives the dummy ingot device to move up and down, and the cylindrical dummy ingot device is arranged at the bottom of a cavity below the outer crystallizer;
C. introducing molten metal into the upper cover mechanism, filling the molten metal between the inner crystallizer and the outer crystallizer, performing bidirectional cooling on the molten metal through the inner crystallizer and the outer crystallizer to form a blank shell, driving the cylindrical dummy ingot device to move downwards by the lifting push rod, and simultaneously generating periodic vertical relative motion between the blank shell and the inner crystallizer and between the blank shell and the outer crystallizer; the blank shell and the outer crystallizer are in relative motion up and down to play a role in shelling the outer surface of the blank shell and the outer crystallizer;
D. And forming a solidified round billet along with the gradual thickening of the billet shell.
The embodiment of the invention has the following characteristics and advantages: the casting blank is cooled in two directions by combining the inner crystallizer and the outer crystallizer, so that the adaptable effective section of the casting blank for cooling and solidification is greatly increased, and the casting blank is suitable for large-specification solid casting blanks.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic sectional view showing the structure of a large-section round billet continuous casting apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view showing an assembly process of a continuous casting machine part of the large-section round billet continuous casting apparatus according to the embodiment of the present invention;
FIG. 3 is a schematic structural view of an inner mold of the apparatus for continuous casting of a large-section round billet in accordance with the embodiment of the present invention;
FIG. 4 is a partially enlarged schematic view for showing an outer mold in the continuous casting apparatus for a large-cross-section round billet according to the embodiment of the present invention;
FIG. 5 is a partially enlarged view showing a second water cooling system in the continuous casting apparatus for a large-cross-section round billet according to the embodiment of the present invention;
FIG. 6 is a schematic bottom view of the upper lid mechanism of the apparatus for continuously casting a large-diameter round billet according to the embodiment of the present invention;
FIG. 7 is A schematic sectional view taken along line A-O-A of FIG. 6;
FIG. 8 is a schematic bottom view of a base mechanism of the apparatus for continuous casting of large-cross-section round billets in accordance with the embodiment of the present invention;
FIG. 9 is a schematic sectional view taken along line B-O-O1-B of FIG. 8;
FIG. 10 is a schematic view showing a loosening and pressing process of an ultra-large section continuous casting core of the continuous casting apparatus for a large section round billet according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Implementation mode one
As shown in fig. 1 and 2, the continuous casting apparatus for large cross-section round billets according to the embodiment of the present invention includes an inner mold 1, an outer mold 2, a cover mechanism 5, a base mechanism 6, a cylindrical dummy ingot former 10 having a cross-section of a solid round shape, a tundish 7 with a heater, and a stream distributor 8. The inner parts of the upper cover mechanism 5 and the base mechanism 6 are mutually communicated, and the upper cover mechanism 5 and the base mechanism 6 are fixedly connected up and down to form an annular molten metal bath 3. The outer crystallizer 2 is fixedly connected below the base mechanism 6; the inner crystallizer 1 is of an inverted fire arrow-shaped structure, the inner crystallizer 1 is fixedly connected to the upper cover mechanism 5, the lower portion of the inner crystallizer 1 penetrates through the upper cover mechanism 5 and the base mechanism 6, the lower portion of the inner crystallizer 1 is located on the inner side of the outer crystallizer 2 and is concentrically surrounded by the outer crystallizer 2, the molten metal in the tundish 7 is distributed into one stream or multiple streams by the casting flow distributor 8 and is guided into the upper cover mechanism 5, and the molten metal is filled between the inner crystallizer 1 and the outer crystallizer 2. In the initial casting stage, the cylindrical dummy ingot device 10 is arranged at the bottom of the circular cavity below the outer crystallizer 2, the molten metal is cooled by the inner crystallizer 1 and the outer crystallizer 2 to form a solidified circular blank 4, and the circular blank 4 is positioned on the cylindrical dummy ingot device 10.
The inner crystallizer 1 is of an inverted rocket head structure, that is, the inner crystallizer 1 is provided with a cylindrical body, and the head of the body is of a blunt conical head shape.
In this embodiment, the lower part of the inner mold 1 is disposed at the center of the inner side of the outer mold 2, and the molten metal is filled between the inner mold 1 and the outer mold 2, that is, the molten metal is cooled bidirectionally between the inner mold 1 and the outer mold 2 by the two molds, and after cooling, the molten metal is drawn out from below the two molds as a solidified round billet 4. Further, in the present embodiment, the inner mold 1 is combined with the outer mold 2 to cool the round billet 4 in two directions, so that the effective thickness of the round billet 4 adaptable to cooling and solidification is greatly increased, and the present embodiment is suitable for manufacturing round billets of larger specifications.
In this embodiment, the inner mold 1 and the outer mold 2 are fixedly connected together by the upper cover mechanism 5 and the base mechanism 6, so that the inner mold and the outer mold are fixed and concentrically arranged, and thus, the replacement of each component becomes easier and more convenient. In addition, the whole fire arrow type crystallizer of the embodiment is soaked in molten metal, a solid casting blank is formed below the crystallizer, and the solid casting blanks with different sections can be produced by replacing fire arrows with different diameters and cone angles.
Referring to fig. 3, the inner mold 1 includes a water inlet straight conduit 1h, a water return conduit 1i and a cooling water circuit. The water return pipe 1i is arranged outside the water inlet straight pipe 1h in an enclosing mode at intervals, the water return pipe 1i comprises a water return straight pipe 1j and an inner crystallizer outer sleeve 1k which are connected up and down, the inner crystallizer outer sleeve 1k is V-shaped, and a first heat insulation sleeve 1g is wrapped outside the water return pipe 1 i; a cooling water circuit is provided inside the inner crystallizer 1.
The cooling water loop comprises a water inlet loop 1a, a water return loop 1b and a water hole 1 c. The water inlet loop 1a is positioned in the water inlet straight conduit 1h, and the upper end of the water inlet loop 1a is provided with a water inlet 1 d; a gap between the water inlet straight conduit 1h and the water return conduit 1i forms the water return loop 1b, and the upper end of the water return loop 1b is provided with a water return port 1 e; the water hole 1c is arranged between the lower end of the water inlet straight conduit 1h and the inner crystallizer jacket 1k, and the water inlet loop 1a is communicated with the water return loop 1b through the water hole 1 c.
Referring to the arrow direction of fig. 3, the cooling water enters the water inlet circuit 1a from the water inlet 1d, then flows into the water return circuit 1b through the water holes 1c, and then flows out from the water return port 1 e. Wherein, the water inlet 1d and the water return port 1e are both positioned at the upper end of the inner crystallizer 1, the water hole is positioned at the lower end of the inner crystallizer 1, so that cooling water flows in the inner crystallizer 1, and the molten metal near the inner crystallizer 1 in the annular molten metal bath 3 can be fully cooled.
The first heat insulation sleeve 1g comprises a high-temperature fire-resistant pipe 1m and high-strength graphite 1n, the high-temperature fire-resistant pipe 1m is wrapped outside the water return straight conduit 1j, and the high-strength graphite 1n is wrapped outside the inner crystallizer outer sleeve 1 k. In the embodiment, the high-temperature refractory pipe 1m is arranged on the periphery of the water return straight conduit 1j to separate the external high-temperature overheated molten metal from the water return straight conduit 1j, the high-strength graphite 1n is arranged outside the inner crystallizer jacket 1k in a surrounding manner, and the inner crystallizer jacket 1k is separated from the molten metal to play a role in heat transfer and protection of the inner crystallizer.
An inner crystallizer flange 1f is arranged above the inner crystallizer 1, and the inner crystallizer 1 is fixed on the upper cover mechanism 5 through the inner crystallizer flange 1f, namely, the part of the inner crystallizer 1 below the position of the inner crystallizer flange 1f is positioned in the annular molten metal bath 3, and the part of the inner crystallizer flange 1f is positioned outside the annular molten metal bath 3.
The return water pipe 1i still includes return water and emits pipe 1p, return water emits pipe 1p interval ground cover and establishes the outside of the straight pipe of intaking to be connected at the top of the straight pipe 1j of return water, return water emit the pipe with intake the clearance between the straight pipe with the return water return circuit is linked together, return water mouth 1e sets up on return water emits pipe 1p, interior crystallizer flange 1f is located the top of the straight pipe 1j of return water. Wherein, the backwater top pipe 1p can be directly connected with the backwater straight pipe 1j, such as welded; or, as shown in fig. 6, the lower end of the return water cap conduit 1p is connected with a return water cap flange 1q, the return water cap flange 1q is connected with the inner crystallizer flange 1f in a matching manner, and the return water cap conduit 1p is further connected with a return water straight conduit 1 j.
As shown in fig. 1 and 4, the outer crystallizer 2 includes an outer crystallizer outer sleeve 2a, an outer crystallizer inner sleeve 2b and a crystallizer copper tube 2c, which are sequentially arranged from outside to inside at intervals, a transversely placed isolation plate 2d is connected between the outer crystallizer inner sleeve 2b and the outer crystallizer outer sleeve 2a, the inner side end of the isolation plate 2d is connected with the outer crystallizer inner sleeve 2b, the outer side end is connected with the outer crystallizer outer sleeve 2a, and the isolation plate 2d can be located at the middle position of the outer crystallizer inner sleeve 2b in the height direction; an electromagnetic stirrer 2e is arranged between the inner and outer jackets 2b and 2a of the outer crystallizer, and the electromagnetic stirrer 2e is positioned above the isolation plate 2 d; the outer crystallizer jacket 2a is respectively provided with a water inlet 2f and a water outlet 2g, the water inlet 2f is positioned below the isolation plate 2d, and the water outlet 2g is positioned above the isolation plate 2 d; the upper end and the lower end of the inner sleeve 2b of the outer crystallizer are respectively penetrated with a water flow hole 2 h; and a second heat insulation sleeve 2i is arranged at the joint of the outer crystallizer 2 and the casting blank 4, namely the second heat insulation sleeve 2i is positioned at the inner side of the outer crystallizer 2.
Wherein the outer mould 2 may be connected to the base means 6 by an outer mould flange 2j, where the outer mould flange 2j is connected to the top end of the mould copper tube 2c, the outer mould flange 2j being combined with a second base flange 6g for connecting the outer mould 2 to the base means 6. The second insulating sleeve 2i may be high strength graphite. The electromagnetic stirrer 2e is disposed in the outer mold 2, and can crush and stir crystal grains to form a large number of crystal nuclei.
In this embodiment, a gap is formed between the inner and outer jackets 2b, 2a of the outer crystallizer, and the partition plate 2d partitions the space between the inner and outer jackets 2b, 2a into two independent spaces; a gap is arranged between the outer crystallizer inner sleeve 2a and the crystallizer copper pipe 2 c. As shown by the arrow direction in fig. 4, the cooling water enters the lower gap between the inner and outer jackets 2b, 2a of the outer mold from the water inlet 2f, then flows into the gap between the inner jacket 2a of the outer mold and the copper tube 2c of the mold from the water flow hole 2h at the lower end of the inner jacket 2a of the outer mold, then flows into the upper gap between the inner and outer jackets 2b, 2a through the water flow hole 2h at the upper end of the inner jacket 2a of the outer mold, and then flows out from the water outlet 2 g. The cooling water flows in the outer crystallizer 2, exchanges heat with the molten metal in the outer crystallizer 2, and then flows out of the hot water outlet 2 g.
According to the embodiment of the present invention, as shown in fig. 6 and 7, the upper cover mechanism 5 includes an Jiong-shaped upper cover housing 5a, and a first upper cover flange 5b is connected to the outer side of the bottom of the upper cover housing 5a for connecting the base mechanism 6. The lower part of the upper cover shell 5a is connected with a heat insulation lining body 5 c. An inner crystallizer through hole 5d is axially formed in the central shaft of the upper cover mechanism 5 in a penetrating manner, a water gap through hole 5e is axially formed in the upper cover mechanism 5 in a penetrating manner, the water gap through hole 5e is located on the outer side of the inner crystallizer through hole 5d, and a second upper cover flange 5f is arranged at the top of the upper cover shell 5a corresponding to the inner crystallizer through hole 5d and used for being connected with the inner crystallizer 1. In this embodiment, the inner mold 1 is fixed on the second upper cover flange 5f through the inner mold through hole 5d, so that the inner mold 1 and the upper cover mechanism 5 are combined together, the molten metal flows into the upper cover mechanism 5 through the water gap through hole 5e, and the water gap through hole 5e can be used for observing the liquid level. Here, two uniformly distributed water gap penetration holes 5e are provided around the inner mold penetration hole 5 d.
At the bottom of the heat-insulating and heat-preserving lining body 5c, a slag trap 5g is provided extending from the edge of the inner mold penetration hole 5d to the outside in the tangential direction, and the slag trap 5g separates molten metal distributed in the annular molten metal bath 3 from upper dross, and as shown in fig. 9, there are two slag traps 5 g. The upper cover mechanism 5 is axially provided with a dispersion hole 5h in a penetrating manner, the dispersion hole 5h is positioned outside the inner crystallizer perforation 5d, the upper part of the upper cover shell 5a is provided with a heat insulation cover plate 5i covering the upper end of the dispersion hole 5h, and the heat insulation cover plate 5i can prevent heat in the annular molten metal bath 3 from being dispersed from the dispersion hole 5 h. Here, two diffusing holes 5h are uniformly distributed around the inner mold penetration hole 5d, the diffusing holes 5h are used for discharging gas generated and brought in the cavity of the annular molten metal bath 3 at the initial casting stage and during casting, and the diffusing holes can also be used as observation and temperature measuring holes and the like.
As shown in fig. 7, the heat insulation and preservation lining body 5c includes a refractory ramming material 5j and a heat insulation refractory lining 5k, the heat insulation refractory lining 5k is connected to the bottom of the inner cavity of the upper cover shell 5a, and the refractory ramming material 5j is filled between the upper cover shell 5a and the heat insulation refractory lining 5 k. After the inner mold 1 is inserted into the inner mold through hole 5d, the refractory ramming material 5j and the heat-insulating refractory lining 5k respectively surround the inner mold 1 at the upper cover mechanism 5 in the vertical position.
As shown in fig. 8 and 9, the base mechanism 6 includes a base housing 6a in a shape of a Chinese character 'ao', a first base flange 6b for connecting the cover mechanism is connected to the outside of the top of the base housing, and the first base flange is fixedly combined with the first cover flange 5b through a fastening connector, such as a combination of a flange bolt 5m and a flange nut 6j, to fixedly connect the cover mechanism 5 and the base mechanism 6 together. A refractory lining body 6c is arranged on the base shell 6a, a base center hole 6d is arranged in the center axial direction of the base mechanism 6 in a penetrating mode, and a second base flange 6g used for being connected with the outer crystallizer 2 is arranged at the position, corresponding to the base center hole 6d, of the bottom of the base shell 6 a.
The upper part of the base mechanism 6 is provided with a tangent ingate 6h which is tangentially arranged with the central hole of the base, the outer end of the tangent ingate corresponds to the water gap penetrating hole 5e, and the inner end of the tangent ingate is communicated with the central hole 6d of the base.
And a variable frequency induction coil 6e is annularly arranged at the lower part of the base mechanism and positioned at the upper part of the outer crystallizer, the variable frequency induction coil is annularly arranged at the outer side of the central hole 6d of the base, and a coil protection cover 6f is arranged outside the variable frequency induction coil 6 e. Wherein, the variable frequency induction coil 6e and the molten metal can be separated by a refractory lining body 6 c. In the normal throwing process, the variable frequency induction coil 6e adopts the functions of low frequency auxiliary stirring, primary crystal grain crushing, internal and external temperature homogenization and outward heat transfer, and transmits a nucleation core to the core part, and adopts power frequency or intermediate frequency for heating and heat preservation of residual molten steel in the later stage of throwing. In addition, a magnetic magnetizer 6p may be further enclosed outside the variable frequency induction coil 6e and inside the coil protecting cover 6 f.
The base mechanism 6 is axially provided with a slag discharge port 3a corresponding to the dispersion hole 5h, and a slag discharge groove 6i is connected between the slag discharge port and the base center hole 6 d. Here, there are two evenly distributed tangential ingates 6h and two evenly distributed gutters 6 i.
In this embodiment, the molten metal entering the upper cover mechanism 5 enters the base mechanism 6 through the tangent ingate 6h, the tangent ingate 6h changes the molten metal from the vertical direction to the tangential direction of the annular cavity, and then moves circumferentially along the annular cavity, and the liquid slag floating above the molten metal is stopped by the slag baffle 5g on the upper cover mechanism 5 in the process of rotating along with the molten metal and flows out of the slag discharge port 3a along the slag discharge groove 6 i.
In addition, as shown in fig. 1, the base mechanism 6 may be mounted on the steel structure foundation 3b, and a slag storage tray 3c may be placed on the steel structure foundation 3b at a position corresponding to the slag discharge port 3a, so that the dross discharged from the slag discharge port 3a falls into the slag storage tray 3 c.
The refractory lining body 6c includes a high temperature refractory lining 6k, a carbon refractory lining 6m and a knotted refractory 6n, the high temperature refractory lining 6k is provided at an upper portion of an inner cavity of the base housing 6a, the carbon refractory lining 6m is provided at a lower portion of the high temperature refractory lining 6k and is located around the base center hole 6d, and the knotted refractory 6n is filled between the high temperature refractory lining 6k and the base housing 6a and is located outside the coil protecting cover 6 f. That is, in this embodiment, the high temperature refractory lining 6k and the carbon refractory lining 6m are both in contact with the high temperature molten metal, the lower end of the carbon refractory lining 6m is adjacent to the outer mold 2, and the variable frequency induction coil 6e is disposed on the periphery of the carbon refractory lining 6m and protected by the coil protection cover 6 f; the high-temperature refractory lining 6k and the carbon refractory brick lining 6m constitute a base inner layer working lining, and a knotted refractory 6n is filled between the base shell 6a and the base inner layer working lining.
As shown in fig. 1 and 5, the casting apparatus further comprises a second water cooling system 9, the second water cooling system 9 is connected below the outer mold 2, and the second water cooling system 9 comprises an outer second water-cooling spray assembly 9a and a second cold leg foot roll 9 e. The outer two water-cooling spray assemblies 9a comprise a plurality of rows of outer two-cooling nozzle ring groups 9b which are axially arranged along the round billet 4, each row of outer two-cooling nozzle ring groups 9b are provided with a plurality of outer two water-cooling nozzles 9c which are uniformly distributed along the outer circumference of the round billet, and a steam recovery box 9d is arranged outside the outer two water-cooling spray assemblies 9 a. The two-cold-section foot roller 9e is arranged between two outer two water-cooling nozzle ring groups 9b which are adjacent up and down, so that water flow sprayed by the outer two water-cooling nozzles 9c is sprayed to the round billet 4 as much as possible and is not blocked by the two-cold-section foot roller 9e, and the two-cold-section foot roller 9e can be used for clamping the red hot casting billet 4 with a liquid core.
In this embodiment, the outer two water-cooling nozzles 9c of the outer two water-cooling spray assembly 9a are used for continuously cooling the outer surface of the casting blank of the mold, the outer two water-cooling spray assembly 9a includes nine rows of outer two water-cooling nozzle ring sets 9b arranged along the length direction of the round billet 4, the figure is only schematic, the number of nozzles in the nozzle ring sets may be 5 to 50 rows, each outer two water-cooling nozzle ring set 9b has a plurality of outer two water-cooling nozzles 9c, the number of the outer two water-cooling nozzles 9c may be determined according to the need and the diameter of the round billet 4, and here, each outer two water-cooling nozzle ring set 9b has 6 to 12 outer two water-cooling nozzles 9 c.
As shown in fig. 1, the tundish 7 can be a tundish which is heated by electromagnetic heating, and the bottom of the tundish 7 is provided with a tapping hole; the top of the casting flow distributor 8 is provided with a molten steel receiving port, 1 to 4 shunt pipes 8a can be uniformly distributed at the lower part of the casting flow distributor 8, the number of the shunt pipes 8a is the same as that of water gap penetrating holes 5e of the upper cover mechanism 5, and two shunt pipes 8a are arranged at the position, namely, the casting flow distributor 8 distributes water flow in the tundish 7 into two flows which are symmetrical 180 degrees and are guided into the upper cover mechanism 5; of course, the flow distributor 8 may also distribute the flow of water in the tundish 7 into one flow, three flows, or more flows, and introduce the flow into the cover mechanism 5, as necessary.
A plurality of rows of clamping guide rollers 12 are annularly arranged below the outer crystallizer 2 and are used for clamping the red hot casting blank 4 with the liquid core from the inner crystallizer 1 and the outer crystallizer 2.
The casting device further comprises a lifting push rod 11, wherein the lifting push rod 11 is connected to the bottom of the cylindrical dummy ingot device 10 and drives the cylindrical dummy ingot device 10 to move up and down. In this embodiment, in the initial casting stage, the cylindrical dummy ingot device 10 seals the bottom of the circular cavity below the outer mold 2, and the lifting push rod 11 pulls the cylindrical dummy ingot device 10 downward along with the casting, so that the casting blank shell is removed from the mold.
In addition, the lifting push rod 11 can also vibrate up and down periodically while dragging the cylindrical dummy ingot device 10 downwards, so that the casting blank shell moves up and down relative to the inner crystallizer and the outer crystallizer, the purpose of easily shelling the casting blank shell and the inner crystallizer 1 and the outer crystallizer 2 is achieved, and the blank shell and the inner crystallizer 1 move up and down relative to each other, so that the effects of tamping a central structure, eliminating a central shrinkage cavity and loosening under a semi-solid state are achieved.
As shown in fig. 10, the following four-stage process can be described throughout the up-down tamping cycle of the billet and shell:
as shown in fig. 10(a), the first stage: in an initial state, namely a process of lengthening the distance between the inner crystallizer 1 and a solid phase below, putting a high-temperature liquid phase above, namely a high-temperature superheated molten metal 4c into a central V molten pool, and sequentially arranging a supercooled molten metal 4d (solid phase proportion is 0-30%) enriched with a large number of crystal nuclei, a first semi-solid two-phase region 4e (solid phase proportion is 60-90%) and a compact high-temperature solid phase 4g from top to bottom between the high-temperature superheated molten metal 4c and a normal casting blank 4 in a casting cavity;
as shown in fig. 10(b), the second stage: in the first solidification nucleation stage, the supercooled molten metal 4d (solid phase proportion is 0-30%) which enters a central molten pool and is rich in a large number of crystal nuclei is cooled by heat transfer from the lower part and the side surface and heat transfer from the upper inner crystallizer 1 and the inner side crystallizer to form a lower V-shaped solid-liquid two-phase area 4e (solid phase proportion is more than or equal to 60-90%) close to a lower solidified body and an upper V-shaped solid-liquid two-phase area 4f close to an upper V-shaped inner crystallizer, and the upper V-shaped solid-liquid two-phase area 4f is also called a second semi-solid two-phase area (solid phase proportion is 30-60%);
As shown in fig. 10(c), the third stage: in the second solidification nucleation stage, the solid phase fraction proportion of the upper and lower V-shaped solid-liquid two- phase regions 4f and 4e is continuously increased, meanwhile, the middle pure liquid phase region is continuously reduced, and finally, the upper and lower solid-liquid two-phase regions tend to merge;
as shown in fig. 10(d), the fourth stage: in the semi-solid pressing stage, the distance between the inner crystallizer 1 and the solid phase 4g below is relatively shortened, namely, the semi-solid liquid-solid two-phase area in the middle is pressed by means of the relative extrusion motion of the casting blank 4 and the inner crystallizer 1, so that loose holes accompanying the two-phase area are compacted, the purpose of eliminating loose shrinkage cavities is achieved, and the whole motion cycle is finished; the distance between the inner crystallizer and the solid phase below the inner crystallizer is pulled back again to enter the next cycle.
Besides, the method of the up-and-down relative movement between the inner mold 1 and the casting blank shell, i.e. the relative movement between the inner mold 1 and the solid phase 4g below, not only can the lifting push rod drag the cylindrical dummy ingot device 10 downwards, but also can vibrate up and down periodically to make the casting blank shell move up and down relative to the inner mold and the outer mold, and the method also comprises the following steps: the upper part of the inner crystallizer 1 and the outer crystallizer 2, the base mechanism 6 and the upper cover mechanism 5 are fixed; or, the base mechanism 6 and the inner and outer crystallizers 1 and 2 can be dragged to do up-and-down periodic motion through a hydraulic vibration mechanism arranged between the steel structure foundations 3 b; alternatively, the inner mold 1 can be driven to move up and down periodically by a lifting mechanism mounted on the inner mold flange 1f of the upper cover mechanism 5. The blank drawing mechanism, the hydraulic vibration mechanism and the lifting mechanism are well known to those skilled in the art and are not described in detail herein.
As shown in FIG. 1, the following describes the operation of an embodiment of the present invention:
(1) assembling: as shown in fig. 3, the assembly of each component is completed, the dummy ingot device 10 is arranged in the cavity below the inner crystallizer 1 and the outer crystallizer 2, and the peripheral gap is processed, so that the casting of the material is ready;
(2) casting: the qualified molten steel is hung above a tundish 7, a molten steel ladle water gap control system is opened, a liquid outlet of the tundish 7 is opened after the molten steel amount in the tundish 7 reaches 80%, the molten steel is respectively led into water gap penetrating holes 5e of upper cover mechanisms 5 which are 180 degrees from each other from a molten steel outlet of the tundish 7 through a casting flow distributor 8, then the molten steel rotates to enter a round billet casting cavity of a base mechanism 6 through a tangent inner pouring gate 6h, the molten metal makes circular motion in the casting cavity, dross floating on the molten metal surface realizes steel-slag separation through specific gravity difference in the rotating process, is separated by a slag baffle 5g arranged on the upper cover mechanism 5 to enter a slag discharge groove 6i, and is discharged from a slag discharge port 3 a;
the molten metal is cooled and solidified by the inner crystallizer 1 and the outer crystallizer 2 to form a blank shell, the blank shell is pulled downwards by the dummy ingot device 10, and simultaneously, the lifting push rod 11 drives the dummy ingot device and the casting blank to vibrate up and down relative to the crystallizers 1 and 2, so that the blank shell is separated from the crystallizers, the blank shell gradually moves downwards at the blank pulling speed, and the blank shell gradually thickens at the same time, and V-shaped solidified blank shells and V-shaped liquid cores at the core parts along the two sides of the inner crystallizer 1 and the outer crystallizer 2 are formed in the crystallizers; when the blank shell is pulled out of the inner crystallizer and the outer crystallizer, the instantaneously red hot blank shell is exposed in the air and enters a second water cooling system 9;
(3) And (3) cooling control: the outer surface of the red hot large-section casting blank with the liquid core entering the second water cooling system 9 is cooled by an outer two water cooling nozzles 9c from the lower part of the outer crystallizer 2, the temperature is gradually reduced, and the proportion of the liquid core is gradually reduced until the bottom of the V-shaped mould is completely formed into a solid;
(4) electromagnetic stirring and heating stop pouring: after the superheated molten metal is injected into the cavity, a weak solidified layer or a supercooled metal layer is formed on the inner cavity of the cylindrical surface under the cooling temperature reduction of the cooling water loops on the inner crystallizer 1 and the outer crystallizer 2 and the variable frequency induction coil 6 e;
in the normal casting process, the variable-frequency induction coil 6e mainly uses a periodic low-frequency alternating magnetic field to stir the supercooled metal layer, and mixes the supercooled molten metal with the liquid with higher temperature in the middle of the liquid to increase the number of non-uniform cores in the molten metal; in the later stage of casting, the pulling speed is gradually reduced in a matching manner until the pulling is stopped, when feeding liquid above the feeding liquid is only used for supplementing the part which is identical to the feeder head and is needed by solidification of the V-shaped liquid core, the working frequency of the variable-frequency induction coil 6e is changed into power frequency or medium frequency continuous power supply, and at the moment, the water-cooling variable-frequency induction coil 6e serves as an induction heating holding furnace to play a role in holding and heating the feeder head;
Then, with the continuous reduction of the liquid core, when the tail end of the liquid core gradually enters the crystallizer, the cooling water in the inner crystallizer 1 is gradually reduced, the inner crystallizer 1 is slowly lifted until the residual metal liquid in the variable frequency induction coil 6e completely enters the blank shell, the inner crystallizer 1 is completely pulled out, and a heat insulation material is covered above the residual metal liquid until the residual metal liquid is completely solidified;
(5) stripping ingots: taking out the solidified steel billet from the casting system through a hot moment in the normal continuous casting process at the lower end of the complete solidification zone to realize continuous casting blank; after the continuous casting is performed for a certain length, the casting may be stopped until the remaining molten metal is completely solidified (the casting stop step in (4) above), and finally the entire ingot blank may be taken out at once to realize a semicontinuous cast slab.
Compared with the traditional method, the embodiment of the invention has the following advantages:
1. because the embodiment of the invention adopts the special fixing mode of the upper cover mechanism 5, the base mechanism 6 and the central inner crystallizer 1, the fixing and concentric replacement of the inner crystallizer 1 and the outer crystallizer 2 become easier and more convenient.
2. Because the embodiment of the invention adopts the inner crystallizer 1 and the outer crystallizer 2 to carry out bidirectional cooling on the casting blank, the adaptable effective thickness of the casting blank for cooling and solidifying is greatly increased, and the diameter of the casting blank which can be cast is nearly doubled compared with the traditional method.
3. Because the solid casting blank of the embodiment of the invention adopts the structure of the special fire arrow inner crystallizer 1 and the special core part semi-solid tamping compaction method, the forced rolling center shrinkage cavity and the forced rolling center loosening are realized, the decisive action is realized on eliminating the large section center solidification defect, and compared with the traditional casting blank surface liquid core soft reduction method, the mechanism is simpler and the effect is more obvious.
4. The embodiment of the invention adopts a vertical casting and drawing method, thereby avoiding the defects that the horizontal casting circumference of the large-section round billet is not uniformly solidified up and down, and impurities or segregation are gathered at the upper half part, and ensuring the quality consistency of the whole casting blank.
5. Because the casting system of the embodiment of the invention adopts a double tangent type ingate structure, molten metal enters a cavity from a tangent ingate for 6 hours in a rotating way, the phenomenon of inconsistent temperature and solidification of the whole section, particularly the casting of an oversized section, is avoided, and the effect of separating steel slag by utilizing the specific gravity difference of the steel slag is also realized.
6. Because the slag-iron separation baffle mechanism is arranged on the rotating track of the metal liquid of the upper cover, namely the slag baffle plate 5g is arranged, the separation and the discharge of the scum and the pure metal liquid can be effectively realized.
7. Because the inner crystallizer 1 and the outer crystallizer 2 both adopt the high-strength graphite composite working lining, the copper sleeve crystallizer can be effectively protected, the auxiliary effect of lubrication and shelling can be achieved, and casting without protective slag can be realized.
8. Because the frequency conversion induction coil 6e is arranged in the embodiment of the invention, the beneficial effects of electromagnetic stirring, grain refinement and metal liquid temperature adjustment in the cavity in the normal production process are realized, and the important effects of heating and heat preservation of a tail billet dead head, shortening of tail billet shrinkage cavity and improvement of the casting blank yield are achieved by matching with the change of the tail billet throwing speed.
In conclusion, due to the application of the measures, the continuous casting of the solid casting blank with the ultra-large section is not limited by the section specification any more, and the cooling system of the inner crystallizer and the outer crystallizer, the second water cooling system for spraying water on the inner surface and the outer surface, the semi-solid tamping method and the variable frequency induction coil tail blank heating and heat preservation function play roles in improving the casting quality and the yield.
Second embodiment
The embodiment of the invention also provides a casting method of the large-section continuous casting billet, which comprises the following steps:
A. providing an inner crystallizer 1, an outer crystallizer 2, an upper cover mechanism 5 and a base mechanism 6; the base mechanism is communicated with the inside of the upper cover mechanism 5, and the upper cover mechanism 5 is fixedly connected with the base mechanism 6 up and down; the outer crystallizer 2 is fixedly connected below the base mechanism 6; the inner crystallizer 1 is an inverted fire arrow-shaped structure, the inner crystallizer 1 is fixedly connected to the upper cover mechanism 5, and the lower part of the inner crystallizer 1 penetrates through the upper cover mechanism 5 and the inner part of the base mechanism 6, so that the lower part of the inner crystallizer 1 is positioned at the inner side of the outer crystallizer 2 and is concentrically surrounded by the outer crystallizer 2;
B. Providing a cylindrical dummy ingot device 10 with a solid round section and a lifting push rod 11, wherein the lifting push rod 11 is connected to the bottom of the cylindrical dummy ingot device and drives the dummy ingot device to move up and down, and the cylindrical dummy ingot device is arranged at the bottom of a cavity below the outer crystallizer 2;
C. introducing molten metal into an upper cover mechanism 5, filling the molten metal between the inner crystallizer 1 and the outer crystallizer 2, performing bidirectional cooling on the molten metal through the inner crystallizer 1 and the outer crystallizer 2 to form a blank shell, driving a cylindrical dummy ingot device to move downwards by a lifting push rod, and simultaneously generating periodic vertical relative motion between the blank shell and the inner crystallizer as well as between the blank shell and the outer crystallizer; the blank shell and the outer crystallizer are in relative motion up and down to play a role in shelling the outer surface of the blank shell and the outer crystallizer;
D. and forming a solidified round billet along with the gradual thickening of the billet shell.
Further, the method for generating the periodic up-and-down relative movement between the blank shell and the inner mold in the step C includes the following steps:
(1) the lifting push rod 11 drives the cylindrical dummy ingot device 10 to move downwards, and simultaneously, the lifting push rod 11 drives the cylindrical dummy ingot device 10 to move up and down, so that the blank shell and the inner and outer crystallizers 1 and 2 generate periodic up-and-down relative movement; at this time, the inner and outer molds 1 and 2 are not moved together with the base mechanism 6 and the upper cover mechanism 5.
(2) A blank drawing mechanism is additionally arranged on the cylindrical dummy ingot device 10, and the cylindrical dummy ingot device 10 is driven by the blank drawing mechanism to move up and down, so that the blank shell and the inner and outer crystallizers 1 and 2 generate periodic up-and-down relative movement; at this time, the inner and outer molds 1 and 2 are not moved together with the base mechanism 6 and the upper cover mechanism 5.
(3) And a lifting mechanism is arranged on the inner crystallizer 1 and drives the inner crystallizer 1 to do periodic up-and-down motion. Or,
(4) a hydraulic vibration mechanism is arranged on the steel structure foundation 3b, and the base mechanism 6 and the inner and outer crystallizers 1 and 2 are dragged to do periodic up-and-down movement through the hydraulic vibration mechanism.
Other further steps and structures of this embodiment may be the same as those of the first embodiment, and are not described herein again.
The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.
Claims (21)
1. The continuous casting device of the round billet with the large section is characterized by comprising an inner crystallizer (1), an outer crystallizer (2), an upper cover mechanism (5), a base mechanism (6), a cylindrical dummy ingot device (10) with the solid round section, a tundish (7) with heating and a casting flow distributor (8); the base mechanism (6) is communicated with the inside of the upper cover mechanism (5), and the upper cover mechanism (5) is fixedly connected with the base mechanism (6) up and down; the outer crystallizer (2) is fixedly connected below the base mechanism (6); the inner crystallizer (1) is of an inverted fire arrow-shaped structure, the inner crystallizer (1) is fixedly connected to the upper cover mechanism (5), the lower part of the inner crystallizer (1) penetrates through the upper cover mechanism (5) and the inner part of the base mechanism (6), the lower part of the inner crystallizer (1) is located on the inner side of the outer crystallizer (2) and is concentrically surrounded by the outer crystallizer (2), molten metal in the tundish (7) is distributed into one stream or multiple streams by the casting flow distributor (8) and is guided into the upper cover mechanism (5), and molten metal is filled between the inner crystallizer (1) and the outer crystallizer (2); in the initial casting stage, the cylindrical dummy ingot device (10) is arranged at the bottom of the circular cavity below the outer crystallizer (2), the molten metal is cooled by the inner crystallizer (1) and the outer crystallizer (2) to form a solidified round billet (4), and the round billet is positioned on the cylindrical dummy ingot device (10).
2. Continuous casting plant of large-section round billets according to claim 1, characterised in that said internal crystalliser (1) comprises a water inlet straight conduit, a water return conduit and a cooling water circuit; the water return pipe is arranged around the water inlet straight pipe at intervals and comprises a water return straight pipe and an inner crystallizer jacket which are connected up and down, the inner crystallizer jacket is V-shaped, and a first heat insulation sleeve is wrapped outside the water return pipe; a cooling water circuit is disposed inside the inner crystallizer.
3. The continuous casting apparatus of large-section round billets as claimed in claim 2, wherein the cooling water circuit includes a water inlet circuit (1a), a water return circuit (1b) and water holes (1 c); the water inlet loop (1a) is positioned in the water inlet straight conduit, and the upper end of the water inlet loop (1a) is provided with a water inlet (1 d); a gap between the water inlet straight conduit (1h) and the water return conduit (1i) forms the water return loop (1b), and the upper end of the water return loop (1b) is provided with a water return port (1 e); the water hole (1c) is arranged between the lower end of the water inlet straight conduit (1h) and the inner crystallizer jacket (1k), and the water inlet loop (1a) is communicated with the water return loop (1b) through the water hole (1 c).
4. The continuous casting plant of large-section round billets as claimed in claim 2, characterised in that said first insulating sheath (1g) comprises a high-temperature refractory tube (1m) and high-strength graphite (1n), said high-temperature refractory tube (1m) being coated outside said return water straight duct (1j), said high-strength graphite (1n) being coated outside said inner crystallizer jacket (1 k).
5. Continuous casting plant of large-section round billets as in claim 2, characterised in that above the inner crystalliser (1) there is an inner crystalliser flange (1f), by means of which the inner crystalliser (1) is fixed to the upper cover means (5).
6. The continuous casting device of the large-section round billet according to claim 2, wherein the water return pipe (1i) further comprises a water return riser pipe (1p), the water return riser pipe (1p) is sleeved outside the water inlet straight pipe at intervals and is connected to the top of the water return straight pipe (1j), a gap between the water return riser pipe and the water inlet straight pipe is communicated with the water return loop, the water return port (1e) is arranged on the water return riser pipe (1p), and the inner flange (1f) is located at the top of the crystallizer water return straight pipe (1 j).
7. The continuous casting device of the large-section round billet according to the claim 1, characterized in that the upper cover mechanism (5) comprises an Jiong-shaped upper cover shell (5a), a first upper cover flange (5b) used for connecting the base mechanism (6) is connected with the outer side of the bottom of the upper cover shell (5a), and the inner cavity of the upper cover shell (5a) is built with a heat insulation lining body (5 c); an inner crystallizer perforation (5d) axially penetrates through the central shaft of the upper cover mechanism (5), a water gap penetrating hole (5e) axially penetrates through the upper cover mechanism (5), the water gap penetrating hole (5e) is located on the outer side of the inner crystallizer perforation (5d), and a second upper cover flange (5f) used for being connected with the inner crystallizer (1) is arranged at the position, corresponding to the inner crystallizer perforation (5d), of the top of the upper cover shell (5 a).
8. The continuous casting apparatus of a large-cross-section round billet as claimed in claim 7, wherein a slag trap (5g) is provided at the bottom of the heat-insulating and heat-retaining lining body (5c) to extend tangentially outward from the edge of the inner mold penetration hole (5 d); the upper cover mechanism (5) is axially provided with a dispersion hole (5h) in a penetrating manner, the dispersion hole (5h) is positioned on the outer side of the inner crystallizer through hole (5d), and the upper part of the upper cover shell (5a) is provided with a heat insulation cover plate (5i) covering the upper end of the dispersion hole (5 h).
9. The continuous casting apparatus for large-diameter round billets as claimed in claim 7, characterised in that the insulating and heat-retaining lining (5c) comprises a refractory ramming material (5j) and an insulating refractory lining (5k), the insulating refractory lining (5k) is connected to the bottom of the inner cavity of the upper cover shell (5a), and the refractory ramming material (5j) is filled between the upper cover shell (5a) and the insulating refractory lining (5 k).
10. The casting device of the large-section round billet according to claim 1, characterized in that the base mechanism (6) comprises a concave base shell (6a), a first base flange (6b) for connecting the upper cover mechanism is connected to the outer side of the top of the base shell, the first base flange is fixedly combined with the first upper cover flange (5b) through a fastening connector, a refractory lining body (6c) is arranged on the base shell, a central axial direction of the base mechanism is provided with a base center hole (6d), and a second base flange (6g) for connecting the outer crystallizer (2) is arranged at the bottom of the base shell (6a) corresponding to the position of the base center hole.
11. The casting device of the large-section round billet according to claim 10, characterized in that the upper part of the pedestal mechanism (6) is provided with a tangent ingate (6h) which is tangentially arranged with the central hole of the pedestal, the outer end of the tangent ingate corresponds to the water gap through hole (5e), and the inner end of the tangent ingate is communicated with the central hole (6d) of the pedestal.
12. The casting apparatus for large cross-section round billets as claimed in claim 10, characterised in that the lower part of said base means, located at the upper part of said outer mould, is surrounded by a variable frequency induction coil (6e) surrounding the outside of the central hole of said base, and the outside of said variable frequency induction coil is provided with a coil shield (6 f).
13. The casting device of the large-section round billet according to claim 10, characterized in that a slag discharge port (3a) is axially arranged on the base mechanism (6), the slag discharge port corresponds to the dispersion hole (5h), and a slag discharge groove (6i) is connected between the slag discharge port and the base center hole (6 d).
14. The continuous casting apparatus of large-diameter round billets as claimed in claim 12, wherein the refractory lining body (6c) includes a high temperature refractory lining (6k), a carbon refractory brick lining (6m) and a knotting refractory (6n), the high temperature refractory lining (6k) is provided at an upper portion of the inner cavity of the base housing (6a), the carbon refractory brick lining (6m) is provided at a lower portion of the high temperature refractory lining (6k) around the base center hole (6d), and the knotting refractory (6n) is filled between the high temperature refractory lining (6k) and the base housing (6a) and outside the coil protecting cover (6 f).
15. The continuous casting device of large-section round billets according to claim 1, characterized in that it further comprises a second water cooling system (9), said second water cooling system (9) being connected below said outer crystallizer (2), said second water cooling system (9) comprising outer second water-cooled injection assemblies (9a) and second cold leg foot rolls (9 e); the outer two-water-cooling spray assembly (9a) comprises a plurality of rows of outer two-water-cooling spray nozzle ring groups (9b) which are axially arranged along the casting blank (4), each row of outer two-water-cooling spray nozzle ring group (9b) is provided with a plurality of outer two-water-cooling spray nozzles (9c) which are uniformly distributed along the outer circumference of the casting blank, and a steam recovery box (9d) is arranged outside the outer two-water-cooling spray assembly (9 a); the two-cold-section foot roller (9e) is arranged between two outer two water-cooling nozzle ring groups (9b) which are adjacent up and down and is used for clamping the red hot round billet (4) with the liquid core.
16. The continuous casting apparatus for large cross-section round billets as claimed in claim 5, characterised in that the inner mould flange (1f) is provided with a lifting mechanism which drives the inner mould (1) to move up and down periodically.
17. The continuous casting apparatus of large-section round billets as claimed in claim 1, further comprising a lifting push rod (11), wherein the lifting push rod (11) is connected to the bottom of the cylindrical dummy ingot device (10) and drives the cylindrical dummy ingot device to move up and down.
18. Continuous casting plant for large-section round billets, as claimed in claim 1, characterised in that a plurality of rows of gripping and guiding rolls (12) are provided around the lower part of the external crystallizer (2).
19. A continuous casting method of a large-section round billet comprises the following steps:
A. providing an inner crystallizer (1), an outer crystallizer (2), an upper cover mechanism (5) and a base mechanism (6); the base mechanism is communicated with the inside of the upper cover mechanism (5), and the upper cover mechanism (5) is fixedly connected with the base mechanism (6) up and down; the outer crystallizer (2) is fixedly connected below the base mechanism (6); the inner crystallizer (1) is of an inverted fire arrow-shaped structure, the inner crystallizer (1) is fixedly connected to the upper cover mechanism (5), the lower part of the inner crystallizer (1) penetrates through the upper cover mechanism (5) and the inner part of the base mechanism (6), and the lower part of the inner crystallizer (1) is positioned on the inner side of the outer crystallizer (2) and concentrically surrounded by the outer crystallizer (2);
B. providing a cylindrical dummy ingot device (10) with a solid round section and a lifting push rod (11), wherein the lifting push rod (11) is connected to the bottom of the cylindrical dummy ingot device and drives the dummy ingot device to move up and down, and the cylindrical dummy ingot device is arranged at the bottom of a cavity below the outer crystallizer (2);
C. Introducing molten metal into an upper cover mechanism (5), filling the molten metal between the inner crystallizer (1) and the outer crystallizer (2), performing bidirectional cooling on the molten metal through the inner crystallizer (1) and the outer crystallizer (2) to form a blank shell, driving a cylindrical dummy ingot device to move downwards by a lifting push rod, and simultaneously generating periodic vertical relative motion between the blank shell and the inner crystallizer and between the blank shell and the outer crystallizer; the blank shell and the outer crystallizer are in relative motion up and down to play a role in shelling the outer surface of the blank shell and the outer crystallizer;
D. and forming a solidified round billet along with the gradual thickening of the billet shell.
20. The continuous casting method of a large-area round billet according to claim 19, wherein the method for generating the periodical up-and-down relative movement between the billet shell and the inner mold in the step C is: and driving the cylindrical dummy ingot device to move up and down by the lifting push rod while driving the cylindrical dummy ingot device to move down by the lifting push rod.
21. The continuous casting method of a large-area round billet according to claim 19, wherein the method for generating the periodical up-and-down relative movement between the billet shell and the inner mold in the step C is: and a lifting mechanism is arranged on the inner crystallizer and drives the inner crystallizer to do periodic up-and-down motion.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736954A (en) * | 2014-01-02 | 2014-04-23 | 莱芜钢铁集团有限公司 | Continuous casting producing system for large section casting blank |
| CN105382227A (en) * | 2015-11-30 | 2016-03-09 | 中国科学院长春应用化学研究所 | Shunt device and casting system for magnesium alloy semi-continuous casting |
| CN106457371A (en) * | 2014-03-27 | 2017-02-22 | 首要金属科技奥地利有限责任公司 | Semi-continuous casting of a steel strip |
| CN107790653A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Continuous casting crystallizer and continuous casting method thereof |
| CN111715723A (en) * | 2020-06-07 | 2020-09-29 | 张英华 | Production equipment and control method of high-temperature high-pressure seamless steel pipe |
| CN113426970A (en) * | 2021-06-11 | 2021-09-24 | 一重集团大连工程技术有限公司 | Vertical semi-continuous production device and production process of large round billets with phi of 1000 mm-2000 mm |
| CN115283631A (en) * | 2022-09-01 | 2022-11-04 | 一重集团大连工程技术有限公司 | Insulated feeder head device and control method thereof |
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Cited By (12)
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|---|---|---|---|---|
| CN103736954A (en) * | 2014-01-02 | 2014-04-23 | 莱芜钢铁集团有限公司 | Continuous casting producing system for large section casting blank |
| CN103736954B (en) * | 2014-01-02 | 2015-12-02 | 莱芜钢铁集团有限公司 | A kind of continuous casting production system for big cross section strand |
| CN106457371A (en) * | 2014-03-27 | 2017-02-22 | 首要金属科技奥地利有限责任公司 | Semi-continuous casting of a steel strip |
| CN106457371B (en) * | 2014-03-27 | 2019-05-07 | 首要金属科技奥地利有限责任公司 | The semi-continuous casting of steel band |
| US10307819B2 (en) | 2014-03-27 | 2019-06-04 | Primetals Technologies Austria GmbH | Semi-continuous casting of a steel strip |
| CN105382227A (en) * | 2015-11-30 | 2016-03-09 | 中国科学院长春应用化学研究所 | Shunt device and casting system for magnesium alloy semi-continuous casting |
| CN107790653A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Continuous casting crystallizer and continuous casting method thereof |
| CN111715723A (en) * | 2020-06-07 | 2020-09-29 | 张英华 | Production equipment and control method of high-temperature high-pressure seamless steel pipe |
| CN111715723B (en) * | 2020-06-07 | 2024-03-08 | 张英华 | Production equipment and control method for high-temperature high-pressure seamless steel pipe |
| CN113426970A (en) * | 2021-06-11 | 2021-09-24 | 一重集团大连工程技术有限公司 | Vertical semi-continuous production device and production process of large round billets with phi of 1000 mm-2000 mm |
| CN115283631A (en) * | 2022-09-01 | 2022-11-04 | 一重集团大连工程技术有限公司 | Insulated feeder head device and control method thereof |
| CN115283631B (en) * | 2022-09-01 | 2023-08-01 | 一重集团大连工程技术有限公司 | Thermal insulation riser device and control method thereof |
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