CN112705677B - Device and method for rotary casting of metal ingot - Google Patents
Device and method for rotary casting of metal ingot Download PDFInfo
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- CN112705677B CN112705677B CN202011487614.9A CN202011487614A CN112705677B CN 112705677 B CN112705677 B CN 112705677B CN 202011487614 A CN202011487614 A CN 202011487614A CN 112705677 B CN112705677 B CN 112705677B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D33/00—Equipment for handling moulds
- B22D33/02—Turning or transposing moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
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Abstract
The invention aims to solve the problems of the existing large-scale casting technology, provides a device and a method for casting a metal ingot in a rotating mode, and belongs to the technical field of metal casting. The device comprises a vacuum protective atmosphere system, a rotary displacement system positioned inside the vacuum protective atmosphere system, and a casting system positioned above the vacuum protective atmosphere system. The method of the invention comprises the following steps: 1) evacuating the air in the vacuum atmosphere tank; 2) hoisting the tundish; 3) starting the rotary displacement system; 4) and taking out the cast ingot. The device adopts a common die casting mode to obtain a fine-grain homogeneous compact circular or polygonal metal ingot; the invention has the advantages of simple process, uniform internal quality of the cast ingot, high comprehensive yield of the cast ingot and low production cost.
Description
Technical Field
The invention belongs to the technical field of metal casting, and particularly relates to a device and a method for rotary casting of a metal ingot.
Background
Currently, die casting remains the primary method of producing large metal ingots. The common die casting method is to pour the pre-smelted metal melt into an ingot mold to be cooled, solidified and formed. However, as the three-dimensional size of the ingot increases, the solidification speed of the metal melt in the ingot mold is rapidly reduced, especially for some metals with poor heat conductivity (such as alloy steel, titanium and alloy ingots thereof, and the like). This causes a series of quality problems, such as increased segregation, developed columnar crystals, coarse core structure, loose core, increased shrinkage cavity, and increased non-metallic inclusions, which results in a significant decrease in the quality of the ingot.
In order to improve the quality of die-cast metal ingots, Chinese patent document CN101406937A proposes an "inner cooling method for inhibiting macro-segregation of large steel ingots", and a low-temperature steel bar is preset in a cavity of a steel ingot, so that nucleation points in the steel ingot are increased, the solidification speed of the large steel ingot is improved, and the method has an obvious inhibiting effect on the segregation of the large steel ingot. However, the method is complicated in material distribution, the weight ratio of the bar stock to the ingot needs to be controlled within the range of 0.8% -3%, and the effect of refining the structure is weak. Chinese patent applications CN 201210275772, CN 201610316759 and CN200910010862 respectively propose the ideas of micro-ladle casting layer-by-layer solidification and changing into separate and dispersed casting and multi-ladle echelon casting, and control segregation in the range of each casting layer, thereby reducing the segregation degree of the whole cast ingot. However, the methods have the problems of more casting ladles, and great difficulty in controlling each component and casting process parameters. Chinese patent document CN101927336 discloses a method for compositely casting an extra-thick slab by using a continuous casting slab as a mold cavity, wherein the extra-thick slab is formed by forming a mold from 2 or more continuous casting slabs and pouring molten steel between the crystallizer and the continuous casting slabs for solidification and composition, and the method has the obvious defect that an interface between the slab and a solidified structure is easy to oxidize and separate, so that the composition failure is caused. Chinese patent application CN201410742466 proposes ' a reduction casting composite method and a device thereof for large-scale steel ingots ', Chinese patent application 201510138188 proposes ' a method and a device for multi-core reduction multi-ladle co-casting composite casting large-scale steel ingots ', and Chinese patent application 201710545204 proposes ' a method and a device thereof for bidirectional cooling dynamic casting composite cast ingots. However, in the actual casting compounding process, the solid-liquid interface between the cold core and the molten steel usually has pores, which causes the problem of the internal quality of the steel ingot.
Disclosure of Invention
The invention aims at solving the problems of the existing large-scale casting ingot technology, and provides a device and a method for rotary casting of a metal ingot, wherein the device adopts a common die casting mode to obtain a fine-grained, homogeneous and compact circular or polygonal metal ingot; the invention has the advantages of simple process, uniform internal quality of the cast ingot, high comprehensive yield of the cast ingot and low production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device for casting the metal cast ingot in a rotating mode comprises a vacuum protective atmosphere system, a rotating and shifting system and a casting system, wherein the rotating and shifting system is positioned inside the vacuum protective atmosphere system;
the vacuum protective atmosphere system comprises a vacuum atmosphere tank body, a top cover, an air inlet pipeline, an exhaust pipeline and a sealing valve plate; the vacuum atmosphere tank body is formed by welding steel plates, a top cover is arranged at the top of the vacuum atmosphere tank body, an orifice for pouring is arranged on the top cover, a sealing valve plate is arranged at the top end of the orifice for pouring, and the top cover and the vacuum atmosphere tank body are fixed in a sealing mode, such as locking of a sealing bolt or locking of a sealing buckle; the air inlet pipeline is arranged on the side wall of the lower part of the vacuum atmosphere tank body and is used for pumping air in the vacuum atmosphere tank body and filling inert gas into the vacuum atmosphere tank body; the top cover is provided with an exhaust pipeline for exhausting inert gas in the vacuum atmosphere tank body;
further, the vacuum protective atmosphere system also comprises a vacuum air exhaust device and an inert gas supply device which are arranged outside the vacuum atmosphere tank body; the vacuum pumping device and the inert gas supply device are respectively connected with the gas inlet pipeline;
further, a pressure detector is also arranged on a vacuum atmosphere tank body of the vacuum protective atmosphere system;
the rotary displacement system comprises a bottom plate, a transverse moving motor, a transverse moving trolley, a transverse moving track, a transverse transmission mechanism, a supporting roller, a rotary chassis, a rotary motor, a rotary transmission mechanism, a rotary bearing and a bearing seat; the bottom plate is fixed at the bottom of the vacuum atmosphere tank body, two transverse moving tracks are fixedly arranged on the bottom plate, the transverse moving trolley is arranged on the transverse moving tracks, the transverse moving motor is connected with the transverse transmission mechanism, and the transverse transmission mechanism is connected with the transverse moving trolley to enable the transverse moving trolley to move on the transverse moving tracks in a reciprocating mode; the transverse moving trolley is fixedly connected with a set of bearing seats, the rotating bearing is arranged on the bearing seats, the top of the rotating bearing is fixedly connected with the circle center of the bottom of the rotating chassis, the rotating motor drives the rotating transmission mechanism to drive the bearing and the rotating chassis to rotate, a plurality of supporting rollers are uniformly erected below the rotating chassis, the bottoms of the supporting rollers are fixedly connected with the transverse moving trolley, and the rotating chassis is supported and kept balanced;
further, the rotary displacement system is controlled by an electric control system arranged outside the vacuum atmosphere tank body;
the casting system is a container for bearing and casting metal melt and cast ingots, and particularly comprises a tundish, a ladle cover, a stopper rod, a mould body, a mould bottom and a casting platform; the mould bottom is arranged on the rotary chassis, the mould body is arranged on the mould bottom and forms an ingot mould together with the mould bottom, the ingot mould rotates along with the rotary chassis and reciprocates along with the traversing trolley, and the mould body is circular or regular polygon; the casting platform is positioned above the vacuum protective atmosphere system, and the bottom of the platform is connected with the sealing valve plate; the tundish is placed on the casting platform, the top of the tundish is covered with a ladle cover, a water gap at the bottom of the tundish is aligned with a casting orifice of the casting platform, and the stopper rod is positioned in the tundish to control the flow of the metal melt;
furthermore, the inner wall of the mould body is provided with a temperature sensor and a liquid level sensor.
The method for casting the metal ingot by rotation comprises the following steps:
1) evacuating air in the vacuum atmosphere tank: sealing the top cover and the vacuum atmosphere tank body, closing the exhaust pipeline and closing the sealing valve plate; opening the gas inlet pipeline and the vacuum pumping device, vacuumizing and exhausting the vacuum atmosphere tank body, and filling inert gas into the vacuum atmosphere tank body through the inert gas supply device after the gas in the vacuum atmosphere tank body is exhausted until the pressure in the vacuum atmosphere tank body is higher than the atmospheric pressure outside the tank body;
2) hoisting a tundish: the pouring basket is hung on the casting platform, a water gap at the bottom of the pouring basket is aligned to a pouring orifice of the casting platform, then the pre-smelted metal melt is injected into the pouring basket, and the ladle cover is covered;
when the casting is carried out in a vacuum state, the vacuum pumping device is restarted, the vacuum atmosphere tank body is vacuumized and exhausted to the vacuum degree required by the process, the sealing valve plate is opened, the stopper rod is opened, and the metal melt begins to be cast;
when the casting is carried out in the protective atmosphere state, the gas inlet pipeline is opened, inert gas is filled into the vacuum atmosphere tank body through the inert gas supply device, the micro-positive pressure state in the vacuum atmosphere tank body is kept, then the sealing valve plate is opened, the stopper rod is opened, and the metal melt begins to be cast;
3) starting the rotary displacement system: when the stopper rod is opened, the rotating motor is started to drive the rotating transmission mechanism and the rotating chassis to rotate, so that the ingot mold is driven to rotate at a certain number of revolutions, the transverse moving motor is started once every time the ingot mold rotates for a circle, the transverse moving trolley is controlled to move for a certain distance, and the metal melt is ensured to change the casting position once until the metal melt is cast into a complete plane; then, changing the direction of the traversing carriage, and moving the traversing carriage for a distance in the opposite direction every time the ingot mold rotates for a circle, so as to ensure that the metal melt changes the casting position for one time until the metal melt is cast into a complete plane again; repeating the actions, continuously rotating the ingot mould, and intermittently reciprocating the transverse trolley until the ingot mould is filled with the molten metal, and finishing the pouring process; in the pouring process, the flow of the metal melt is controlled by controlling the opening of the stopper rod, so that the temperature field and the solidification process of the metal melt in the ingot mold are controlled;
4) taking out the cast ingot: after the ingot mold is filled with the metal melt, closing the stopper rod at the bottom of the tundish, stopping pouring, stopping the rotating motor and the transverse moving motor, and closing the sealing valve plate; after the residual metal melt in the ingot mold is completely solidified:
when casting is carried out in a vacuum state, the vacuum pumping device is removed, the vacuum atmosphere tank body is removed after the normal pressure in the vacuum atmosphere tank body is recovered, then the top cover is removed, the ingot mold and the cast ingot in the ingot mold are lifted by a crane, and then demolding and hot working are carried out;
when casting is performed in a protective atmosphere state, the supply of inert gas is stopped, the vacuum atmosphere tank body is removed, then the top cover is removed, the ingot mold and the ingot casting inside are lifted by a crane, and then demolding and hot working are performed.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the existing common die casting polygonal ingot, the invention controls the pouring position of the metal melt by rotating the ingot mould and moving the ingot mould, and can accurately control the flow field, the temperature field, the solute concentration field and the stress field of the metal melt in the ingot by matching with the control of the flow of the casting flow, thereby realizing the accurate control of the solidification process of the metal melt.
(2) Compared with the existing common die casting polygonal cast ingot, the invention controls the pouring position of the metal melt by rotating the ingot mould and moving the ingot mould, and can realize the flexible control of the position of a metal molten pool, the depth of the molten pool and the area of the molten pool by matching with the control of the flow of the casting flow, thereby improving the supercooling degree of a solid-liquid two-phase region, improving the nucleation rate and reducing the liquid shrinkage of the metal melt, thereby obtaining the metal cast ingot with finer, more uniform and more compact structure, and the yield of the obtained metal cast ingot is higher.
Drawings
FIG. 1 is a schematic view of an apparatus for rotary casting of a metal ingot in example 1.
Fig. 2 is a sectional top view of a-a in fig. 1.
The device comprises a transverse moving motor 1, a vacuum atmosphere tank 2, a vacuum atmosphere tank 3, a supporting roller 4, an air inlet pipeline 5, a rotating chassis 6, a mold bottom 7, a mold body 8, a sealing bolt 9, a top cover 10, a casting platform 11, a sealing valve plate 12, a tundish 13, a ladle cover 14, a stopper rod 15, a metal melt 16, an exhaust pipeline 17, a rotating motor 18, a transverse moving trolley 18, a bottom plate 19, a transverse moving rail 21, a transverse transmission mechanism 22, a rotary transmission mechanism 23, a rotary bearing 24 and a bearing seat.
Detailed Description
Example 1
The device for casting the metal cast ingot in a rotating mode comprises a vacuum protective atmosphere system, a rotating and shifting system and a casting system, wherein the rotating and shifting system is positioned inside the vacuum protective atmosphere system;
the vacuum protective atmosphere system comprises a vacuum atmosphere tank body 2, a top cover 9, an air inlet pipeline 4, an exhaust pipeline 16, a sealing valve plate 11, a vacuum pumping device and an inert gas supply device, wherein the vacuum pumping device and the inert gas supply device are positioned outside the vacuum atmosphere tank body; the vacuum atmosphere tank body is formed by welding steel plates, a top cover is arranged at the top of the vacuum atmosphere tank body, a hole opening for pouring is formed in the top cover, a sealing valve plate is arranged at the top end of the hole opening for pouring, a sealing fixing mode, such as sealing bolt locking or sealing buckle locking, is adopted between the top cover and the vacuum atmosphere tank body, and a sealing bolt 8 locking mode is adopted in the embodiment; the air inlet pipeline is arranged on the side wall of the lower part of the vacuum atmosphere tank body and is used for pumping air in the vacuum atmosphere tank body and filling inert gas into the vacuum atmosphere tank body, and the tank body is also provided with a pressure detector; an exhaust pipeline is arranged on the top cover and used for exhausting inert gas in the vacuum atmosphere tank body;
the rotary displacement system comprises a bottom plate 19, a traversing motor 1, a traversing trolley 18, a traversing rail 20, a transverse transmission mechanism 21, a supporting roller 3, a rotary chassis 5, a rotary motor 17, a rotary transmission mechanism 22, a rotary bearing 23 and a bearing seat 24; the bottom plate is fixed at the bottom of the vacuum atmosphere tank body, two transverse moving rails are fixedly arranged on the bottom plate, the transverse moving trolley is arranged on the transverse moving rails, the transverse moving motor is connected with the transverse transmission mechanism, and the transverse transmission mechanism is connected with the transverse moving trolley to enable the transverse moving trolley to move on the transverse moving rails in a reciprocating mode; the transverse moving trolley is fixedly connected with a set of bearing seats, the rotating bearing is arranged on the bearing seats, the top of the rotating bearing is fixedly connected with the circle center of the bottom of the rotating chassis, the rotating motor drives the rotating transmission mechanism to drive the bearing and the rotating chassis to rotate, the number of supporting rollers is several, the supporting rollers are uniformly erected below the rotating chassis, and the bottom of the supporting rollers is fixedly connected with the transverse moving trolley to support and keep the rotating chassis balanced; the rotary displacement system is controlled by an electric control system arranged outside the vacuum atmosphere tank body, and the electric control system is a PLC;
the casting system comprises a tundish 12, a ladle cover 13, a stopper 14, a mould body 7, a mould bottom 6 and a casting platform 10; the mould bottom is arranged on the rotary chassis, the mould body is arranged on the mould bottom, forms an ingot mould together with the mould bottom, rotates along with the rotary chassis and reciprocates along with the traversing trolley, the mould body 7 is circular or regular polygon, and the inner wall is provided with a temperature sensor and a liquid level sensor; the casting platform is positioned above the vacuum protective atmosphere system, and the lower part of the casting platform is connected with the sealing valve plate; the pouring box is placed on the casting platform, the top of the pouring box is covered with the box cover, a water gap at the bottom of the pouring box is aligned to a pouring orifice on the casting platform, and the stopper rod is positioned in the pouring box to control the flow of the metal melt.
Example 2
A method of spin casting a metal ingot using the apparatus of example 1, comprising the steps of:
a. evacuating air in the vacuum atmosphere tank: the rotary displacement system and the ingot mold are arranged in a vacuum atmosphere tank body 2, the ingot mold is arranged right below a pouring orifice, a top cover 9 is covered on the vacuum atmosphere tank body 2, the top cover 9 is locked by a sealing bolt 8, an exhaust pipeline 16 is closed, and a sealing valve plate 11 is closed; and opening the gas inlet pipeline 4, opening the vacuum pumping device, vacuumizing and exhausting the vacuum atmosphere tank body 2, filling inert gas into the vacuum atmosphere tank body 2 through the inert gas supply device after the gas in the vacuum atmosphere tank body 2 is emptied, and stopping filling the inert gas into the vacuum atmosphere tank body 2 until the pressure in the vacuum atmosphere tank body 2 is higher than the external atmospheric pressure.
b. Hoisting a tundish: the pouring basket 12 is hung on the casting platform 10, a water gap at the bottom of the pouring basket 12 is aligned to a pouring orifice on the casting platform 10, then the pre-smelted metal melt 15 is injected into the pouring basket 12, and a ladle cover 13 is covered;
when casting is carried out in a vacuum state, the vacuum pumping device is restarted to carry out vacuum pumping and exhaust on the vacuum atmosphere tank body 2, when the vacuum degree reaches the vacuum degree required by the process, the sealing valve plate 11 is opened, the stopper rod 14 is opened, and the metal melt 15 begins to be cast;
when casting is carried out in a protective atmosphere state, the gas inlet pipeline 4 is opened, inert gas is filled into the vacuum atmosphere tank body 2 through the inert gas supply device, the micro-positive pressure state in the vacuum atmosphere tank body 2 is kept, then the sealing valve plate 11 is opened, the stopper rod 14 is opened, and the metal melt 15 begins to be cast;
c. starting a shifting system: starting a rotary displacement system, controlling a rotary transmission mechanism 22 by controlling a rotary motor 17, starting a rotary chassis 5 to drive an ingot mould to rotate at a certain revolution, starting a transverse moving motor 1 once every time the ingot mould rotates for a circle, controlling a transverse moving trolley 18 to move for a certain distance, and ensuring that a metal melt 15 changes a casting position once until the metal melt 15 is cast into a complete plane; then, changing the direction of the traversing carriage 18, wherein the traversing carriage 18 moves a distance in the opposite direction every time the ingot mold rotates for a circle, ensuring that the metal melt 15 changes a casting position once, until the metal melt 15 is cast on a complete plane again, repeating the above actions, the ingot mold continuously rotates, the traversing carriage 18 continuously makes intermittent reciprocating motion until the metal melt 15 is fully cast into the ingot mold, ending the casting process, controlling the flow of the metal melt 15 by controlling the opening degree of the stopper rod 14 in the casting process, and controlling the temperature field and the solidification process of the metal melt 15 in the ingot mold;
d. taking out the cast ingot: after the ingot mould is filled with the molten metal 15, the stopper 14 at the bottom of the tundish 12 is closed, the pouring is stopped, the traversing trolley 18 and the rotating chassis 5 are stopped, and after the residual molten metal in the ingot mould is completely solidified:
when casting is carried out in a vacuum state, the vacuum pumping device is removed, the vacuum atmosphere tank body is removed after the normal pressure in the vacuum atmosphere tank body 2 is recovered, then the top cover 9 is opened, the ingot mold and the cast ingot inside the ingot mold are lifted by a crane, and then demolding and hot processing are carried out;
when casting is performed in a protective atmosphere state, the supply of the inert gas is stopped, the vacuum atmosphere tank body 2 is removed, then the top cover 9 is opened, the ingot mold and the ingot therein are lifted by a crane, and then demolding and hot working are performed.
Example 3
The embodiment relates to a preparation method for casting a metal ingot by rotating the device in embodiment 1, taking preparation of a large-sized 16Mn steel ingot weighing 85 tons as an example, the specific steps are as follows:
a. as shown in fig. 1-2, the apparatus is first assembled: placing a bottom plate 19 at the bottom of a vacuum atmosphere tank body 2, then installing a transverse moving track 20 on the bottom plate 19, then installing an upper transverse moving trolley 18, a transverse moving motor 1 and a transverse moving transmission mechanism 21, placing a rotary chassis 5 and a transmission mechanism and a supporting device thereof on the transverse moving trolley 18, placing a mold bottom 6 and a mold body 7 on the rotary chassis 5, covering a top cover 9 on the vacuum atmosphere tank body 2, locking the top cover by using a sealing bolt 8, then moving the lower part of a casting platform 10, aligning a casting orifice of the top cover 9 with a casting orifice on the casting platform 10, adjusting the transverse moving trolley 18 and the rotary chassis 5, and placing an 85-ton ingot mold below the casting orifice; then the pouring basket 12 is hung on the casting platform 10, and a water gap at the bottom of the pouring basket 12 is aligned with a casting hole on the casting platform;
b. the rotary displacement system and the ingot mold are arranged in a vacuum atmosphere tank body 2, the ingot mold is arranged right below a pouring orifice, a top cover 9 is covered on the vacuum atmosphere tank body 2, the top cover 9 is locked by a sealing bolt 8, an exhaust pipeline 16 is closed, and a sealing valve plate 11 is closed; opening the air inlet pipeline 4, opening the vacuum air extractor, vacuumizing and exhausting the vacuum atmosphere tank body 2, and when the vacuum degree in the vacuum atmosphere tank body 2 reaches 10-1 And when the pressure is Pa, the vacuum pumping device is closed, argon gas is filled into the vacuum atmosphere tank body 2 through the inert gas supply device, and the filling of the argon gas into the vacuum atmosphere tank body 2 is stopped until the pressure in the vacuum atmosphere tank body 2 is higher than the external atmospheric pressure.
c. The method comprises the steps of hanging a tundish 12 on a casting platform 10, aligning a water gap at the bottom of the tundish 12 with a pouring orifice on the casting platform 10, then injecting 85 tons of pre-smelted 16Mn molten steel into the tundish 12, covering a ladle cover 13, then opening an air inlet pipeline 4, filling argon into a vacuum atmosphere tank body 2 through an argon supply device, keeping the relative pressure in the vacuum atmosphere tank body 2 at 2-5 Pa, then opening a sealing valve plate 11, opening a stopper 14, and beginning to pour the 16Mn molten steel;
d. starting a rotary displacement system, controlling a rotary transmission mechanism 22 by controlling a rotary motor 17, starting a rotary chassis 5, driving an ingot mould to rotate by 5-10, starting a transverse moving motor 1 once every time the ingot mould rotates for one circle, controlling a transverse moving trolley 18 to move by 80-100 mm, and ensuring that 16Mn molten steel changes a casting position once until 16Mn molten steel is cast into a complete plane; then, changing the direction of the traversing trolley 18, moving the traversing trolley 18 in the opposite direction by 80-100 mm every time the ingot mold rotates for one circle, ensuring that the 16Mn molten steel changes the casting position once, pouring the 16Mn molten steel into a whole plane again, repeating the above actions, continuously rotating the ingot mold, continuously performing intermittent reciprocating motion on the traversing trolley 18 until the 16Mn molten steel is fully poured into the ingot mold, finishing the pouring process, and controlling the flow of the 16Mn molten steel by controlling the opening degree of the stopper 14 in the pouring process;
e. taking out the cast ingot: after 16Mn molten steel is filled in the ingot mould, the stopper 14 at the bottom of the tundish 12 is closed, the pouring is stopped, the traversing trolley 18 and the rotary chassis 5 are stopped, after the residual 16Mn molten steel in the ingot mould is completely solidified, the inert gas supply is stopped, the vacuum atmosphere tank body 2 is removed, the top cover 9 is opened, the ingot mould and the ingot casting in the ingot mould are lifted by the crane, and then the demoulding and the hot processing are carried out.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A method for casting metal cast ingot by rotation adopts a device for casting metal cast ingot by rotation,
the device for casting the metal cast ingot in a rotating mode comprises a vacuum protective atmosphere system, a rotating and shifting system and a casting system, wherein the rotating and shifting system is positioned in the vacuum protective atmosphere system, and the casting system is positioned above and in the vacuum protective atmosphere system;
the vacuum protective atmosphere system comprises a vacuum atmosphere tank body, a top cover, an air inlet pipeline, an exhaust pipeline and a sealing valve plate; the top of the vacuum atmosphere tank body is provided with a top cover, the top cover is provided with a pouring orifice, a sealing valve plate is arranged at the top end of the pouring orifice, and the top cover and the vacuum atmosphere tank body are fixed in a sealing manner; the air inlet pipeline is arranged on the side wall of the lower part of the vacuum atmosphere tank body, and the top cover is provided with an exhaust pipeline;
the rotary displacement system comprises a bottom plate, a transverse moving motor, a transverse moving trolley, a transverse moving track, a transverse transmission mechanism, a supporting roller, a rotary chassis, a rotary motor, a rotary transmission mechanism, a rotary bearing and a bearing seat; the bottom plate is fixed at the bottom of the vacuum atmosphere tank body, two transverse moving rails are fixedly arranged on the bottom plate, the transverse moving trolley is arranged on the transverse moving rails, the transverse moving motor is connected with the transverse transmission mechanism, and the transverse transmission mechanism is connected with the transverse moving trolley to enable the transverse moving trolley to move on the transverse moving rails in a reciprocating mode; the transverse trolley is fixedly connected with a set of bearing seats, the rotary bearing is arranged on the bearing seats, the top of the rotary bearing is fixedly connected with the circle center of the bottom of the rotary chassis, the rotary motor drives the rotary transmission mechanism to drive the bearing and the rotary chassis to rotate, a plurality of supporting rollers are uniformly erected below the rotary chassis, and the bottoms of the supporting rollers are fixedly connected with the transverse trolley;
the casting system comprises a container for bearing and casting metal melt and a container for bearing cast ingots;
the casting system comprises a tundish, a ladle cover, a stopper, a mould body, a mould bottom and a casting platform; the mould bottom is arranged on the rotary chassis, the mould body is arranged on the mould bottom and forms an ingot mould together with the mould bottom, and the ingot mould rotates along with the rotary chassis and reciprocates along with the traversing trolley; the casting platform is positioned above the vacuum protective atmosphere system, and the bottom of the platform is connected with the sealing valve plate; the tundish is placed on the casting platform, the top of the tundish is covered with a ladle cover, a water gap at the bottom of the tundish is aligned with a casting orifice of the casting platform, and the stopper rod is positioned in the tundish;
the vacuum protective atmosphere system also comprises a vacuum air extraction device and an inert gas supply device which are arranged outside the vacuum atmosphere tank body; the vacuum pumping device and the inert gas supply device are respectively connected with the gas inlet pipeline;
the method is characterized by comprising the following steps:
1) evacuating air in the vacuum atmosphere tank: sealing the top cover and the vacuum atmosphere tank body, closing the exhaust pipeline and closing the sealing valve plate; opening the gas inlet pipeline and the vacuum pumping device, vacuumizing and exhausting the vacuum atmosphere tank body, and filling inert gas into the vacuum atmosphere tank body through the inert gas supply device after the gas in the vacuum atmosphere tank body is exhausted until the pressure in the vacuum atmosphere tank body is higher than the atmospheric pressure outside the tank body;
2) hoisting a tundish: the pouring basket is hung on the casting platform, a water gap at the bottom of the pouring basket is aligned to a pouring orifice of the casting platform, then the pre-smelted metal melt is injected into the pouring basket, and the ladle cover is covered;
when the casting is carried out in a vacuum state, the vacuum pumping device is restarted, the vacuum atmosphere tank body is vacuumized and exhausted to the vacuum degree required by the process, the sealing valve plate is opened, the stopper rod is opened, and the metal melt begins to be cast;
when the casting is carried out in the protective atmosphere state, the gas inlet pipeline is opened, inert gas is filled into the vacuum atmosphere tank body through the inert gas supply device, the micro-positive pressure state in the vacuum atmosphere tank body is kept, then the sealing valve plate is opened, the stopper rod is opened, and the metal melt begins to be cast;
3) starting the rotary displacement system: when the stopper rod is opened, the rotating motor is started to drive the rotating transmission mechanism and the rotating chassis to operate, the ingot mold is driven to rotate at a certain revolution, the transverse moving motor is started once every time the ingot mold rotates for a circle, the transverse moving trolley is controlled to move for a certain distance, and the metal melt is ensured to change the casting position once until the metal melt is cast into a complete plane; then, changing the direction of the traversing carriage, and moving the traversing carriage for a distance in the opposite direction every time the ingot mold rotates for a circle, so as to ensure that the metal melt changes the casting position for one time until the metal melt is cast into a complete plane again; repeating the actions, continuously rotating the ingot mould, and intermittently reciprocating the transverse trolley until the ingot mould is filled with the molten metal, and finishing the pouring process; in the pouring process, the flow of the metal melt is controlled by controlling the opening of the stopper rod, so that the temperature field and the solidification process of the metal melt in the ingot mold are controlled;
4) taking out the cast ingot: after the ingot mold is filled with the metal melt, closing the stopper rod at the bottom of the tundish, stopping pouring, stopping the rotating motor and the transverse moving motor, and closing the sealing valve plate; after the residual metal melt in the ingot mold is completely solidified:
when casting is carried out in a vacuum state, the vacuum pumping device is removed, the vacuum atmosphere tank body is removed after the normal pressure in the vacuum atmosphere tank body is recovered, then the top cover is removed, the ingot mold and the cast ingot in the ingot mold are lifted by a crane, and then demolding and hot working are carried out;
when casting is performed in a protective atmosphere state, the supply of inert gas is stopped, the vacuum atmosphere tank body is removed, then the top cover is removed, the ingot mold and the ingot casting inside are lifted by a crane, and then demolding and hot working are performed.
2. The method of spin casting a metal ingot of claim 1, wherein the vacuum atmosphere canister of the vacuum protected atmosphere system is further provided with a pressure detector.
3. A method of spin casting a metal ingot as claimed in claim 1, wherein the rotary indexing system is controlled by an electronic control system located outside the vacuum atmosphere canister.
4. The method of spin casting a metal ingot of claim 1, wherein the inner walls of the mold body are provided with temperature and level sensors.
5. The method of spin casting a metal ingot of claim 1, wherein the mold body is circular or regular polygonal.
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| JP3299506B2 (en) * | 1998-05-28 | 2002-07-08 | 株式会社神戸製鋼所 | Mold cooling method and casting apparatus |
| JP2000167648A (en) * | 1998-12-03 | 2000-06-20 | Fuji Electric Co Ltd | Apparatus for melting metal |
| EP1263996A1 (en) * | 2000-02-23 | 2002-12-11 | General Electric Company | Nucleated casting systems and methods |
| JP2005279663A (en) * | 2004-03-29 | 2005-10-13 | Kyocera Corp | Apparatus for casting silicon |
| CN100484659C (en) * | 2007-02-15 | 2009-05-06 | 浙江天马轴承股份有限公司 | Incorporated device for vacuum steel ladle degassing and vacuum casting a plurality of steel ingots |
| CN101954467B (en) * | 2010-11-12 | 2011-12-28 | 益阳胜希铸业有限公司 | Vacuum centrifugal casting method and device |
| CN203091691U (en) * | 2012-12-11 | 2013-07-31 | 江苏永钢集团有限公司 | Steel ingot vacuum casting device |
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| FR3019561B1 (en) * | 2014-04-08 | 2017-12-08 | Snecma | THERMAL TREATMENT OF AN ALLOY BASED ON TITANIUM ALUMINUM |
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