CN112059151A - Method and device for realizing shell heating and heat preservation in vacuum casting equipment - Google Patents
Method and device for realizing shell heating and heat preservation in vacuum casting equipment Download PDFInfo
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- CN112059151A CN112059151A CN202010806645.XA CN202010806645A CN112059151A CN 112059151 A CN112059151 A CN 112059151A CN 202010806645 A CN202010806645 A CN 202010806645A CN 112059151 A CN112059151 A CN 112059151A
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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
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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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
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
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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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Abstract
The invention relates to a method and a device for heating and insulating a shell in vacuum casting equipment, wherein the device comprises an insulating bag and a centrifugal tray device for heating or insulating the shell device; the heat-insulating bag is arranged in the vacuum casting equipment, the bottom of the heat-insulating bag is provided with a second opening, the bottom of the vacuum casting equipment is provided with a first opening, and the first opening is aligned with the second opening; the centrifugal tray device is used for loading the shell device, and the centrifugal tray device and the vacuum centrifugal casting equipment are mutually independent; when the centrifugal tray device carrying the shell device enters the vacuum centrifugal casting equipment from the first opening, the shell device just enters the heat-insulating bag through the second opening, and the centrifugal tray device can be matched with the first opening for assembly to realize vacuum sealing of the first opening. The invention can heat and preserve heat of the shell in the vacuum casting equipment, is convenient for the independent transportation and assembly of the centrifugal tray device and the shell device, and can meet the technological requirements of centrifugal casting.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a method and a device for heating and preserving a shell in vacuum casting equipment.
Background
The high-temperature titanium alloy and the titanium-aluminum alloy are widely applied to the field of aerospace heat-resistant structures and show great application prospects, but the two alloys have poor casting fluidity, large stress in the solidification and cooling process and easy cracking, so that the integrity and reliability of castings are greatly reduced. At present, a plurality of researches show that the flowing mold filling capacity of high-temperature titanium alloy and titanium-aluminum alloy can be greatly improved by increasing the temperature of a casting mold or a shell mold during casting, and the shell mold is cooled after being kept warm for a period of time after casting, so that the stress can be obviously slowly released, and the deformation and cracking can be reduced. Therefore, a novel casting process for heating the shell and insulating and solidifying the shell is provided.
In the vacuum casting process, in order to increase the temperature of a casting mold or a shell, the conventional method is to place the shell or a sand box filled with the shell in a separate heating device to be heated to a certain temperature and keep the temperature for a period of time, then take out the shell or the sand box, transfer the shell or the sand box to the vacuum casting device to be fixed, then vacuumize the shell, and finally heat and melt the metal material in a crucible to be liquid for casting. Such shell preheating methods have the following significant drawbacks: (1) the transfer of the shell or flask (containing the shell) heated to a higher temperature from one apparatus to a stationary arrangement in a vacuum casting apparatus is inconvenient, inefficient and dangerous, especially for larger and heavier shells or flasks. (2) The shell or sand box (with the shell) in a high-temperature state in the transfer process can cause heat radiation to workers and damage health; (3) to ensure the safety of the transfer, the permissible preheating temperature of the shell or flask (containing the shell) cannot be too high; (4) the shell heated in the transfer setting process, the vacuumizing process and the heating and smelting process of the metal materials is always in a waiting state, the heat loss is serious, the actual temperature of the shell is difficult to effectively monitor and control, and the actual temperature of the shell is difficult to ensure to accord with the theoretical preset value when the final pouring is finished, so that the actual process is unstable.
Disclosure of Invention
In view of the above technical problems, the present invention provides in a first aspect a device for heating and maintaining shell in a vacuum casting apparatus, comprising a thermal insulation bag for heating or maintaining shell and a centrifugal tray device;
the heat-insulating bag is arranged in vacuum casting equipment, a second opening is formed in the bottom of the heat-insulating bag, a first opening is formed in the bottom of the vacuum casting equipment, and the first opening is aligned with the second opening;
the centrifugal tray device is used for loading the shell device and can drive the shell device to rotate centrifugally, and the centrifugal tray device and the vacuum centrifugal casting equipment are independent;
when the centrifugal tray device carrying the shell device enters the vacuum centrifugal casting equipment from the first opening, the shell device just enters the heat-preservation bag through the second opening, and the centrifugal tray device can be matched and assembled with the first opening to realize vacuum sealing of the first opening.
Optionally, the insulation package is of a cylindrical structure, a third opening is formed in the top of the insulation package, and a sprue cup or a diversion trench is arranged at the third opening.
Optionally, a flange ring base is further fixedly arranged at the bottom of the heat-insulating bag, and the flange ring base and the bottom of the vacuum casting equipment can be connected and fastened through bolts and nuts made of GH4169 alloy.
Optionally, the centrifugal tray device includes a centrifugal tray for fixing the shell device, a flange located below the centrifugal tray, and a vacuum sealing transmission shaft fixed at the lower end of the center of the centrifugal tray; the vacuum sealing transmission shaft penetrates through the flange plate and is rotationally connected with the flange plate, and a flange ring matched with the flange plate is further arranged at the lower end of the first opening.
Optionally, the heat preservation package includes the shell body and sets up the inside heat-generating body of shell body, the heat-generating body is connected with external power supply and is realized the circular telegram and generate heat.
Optionally, the side inwards evenly is provided with the high temperature resistant heat screen of multilayer in proper order in the shell body, just the heat-generating body passes through ceramic bolt nut to be fixed at the inlayer on the internal surface of high temperature resistant heat screen.
Optionally, the high-temperature resistant heat shield is a thin molybdenum plate, and the heating element is formed by twisting and binding molybdenum wires.
Optionally, the outer wall all around of shell body evenly sets up many outer wall strengthening ribs, the shell body top evenly sets up many top strengthening ribs.
Optionally, the outer shell, the outer wall reinforcing ribs and the top reinforcing ribs are made of 2520 steel.
The second aspect of the invention provides a method for realizing shell heating and heat preservation in vacuum casting equipment, which comprises the following steps:
arranging a first opening at the bottom of the vacuum centrifugal casting equipment;
arranging a heat preservation bag for heating or preserving heat of the shell device in the vacuum casting equipment, arranging a second opening at the bottom of the heat preservation bag, and ensuring that the first opening is aligned with the second opening;
a centrifugal tray device which is used for loading the shell device and can drive the shell device to rotate centrifugally is arranged, wherein the centrifugal tray device is independent from the vacuum centrifugal casting equipment;
fixing the shell device on the centrifugal tray device, then feeding the centrifugal tray device loaded with the shell device into the vacuum centrifugal casting equipment from the first opening, wherein the shell device just enters the heat-preservation bag through the second opening, and then matching and assembling the centrifugal tray device with the first opening to realize vacuum sealing of the first opening;
and starting the heat preservation bag to heat or preserve heat of the shell device.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the invention can firstly place and fix the shell or the sand box with the shell on the centrifugal tray of the vacuum casting equipment, and the shell or the sand box with the shell is sent into the heat preservation bag from the bottom of the equipment, and the shell device can be heated and preserved heat in the vacuum casting equipment, thereby saving the operation that the shell or the sand box with the shell which is heated to a very high temperature is transferred into the vacuum casting equipment from a special heating equipment for placing and fixing in the traditional method, saving labor and time, avoiding the heat radiation to workers in the traditional method, and being safer.
(2) The transfer process of the sand box with the shell in a high-temperature state in the traditional shell preheating method outside equipment does not exist, the allowable heating temperature of the sand box with the shell is higher, the heating temperature of the heat-preservation bag can reach 1200 ℃, the heating rate can reach 20 ℃/min, the higher shell temperature is beneficial to mold filling, the cooling speed in a high-temperature stage can be adjusted, and stress concentration is better inhibited.
(3) After the shell or the sand box filled with the shell is fed into the heat-insulating bag and the vacuum casting equipment is closed, the heating and heat insulation of the shell or the sand box filled with the shell can be synchronously carried out with the vacuumizing and the heating smelting, so that the process period is further shortened and the working efficiency is improved compared with the traditional method.
(4) The shell or the sand box filled with the shell is fed into a vacuum casting device to be heated and insulated after being insulated, the problem of unstable heat loss in the traditional shell preheating method does not exist, meanwhile, the thermocouple can carry out real-time temperature measurement, the temperature can be effectively monitored, and the control system can carry out regulation and control, so that the actual temperature and the theoretical preset value of the shell during casting can be well guaranteed, and the shell heating and insulation process is more stable compared with the traditional method.
(5) The heat-insulating coating is installed and fixed in the vacuum casting equipment, the bottom of the heat-insulating coating is opened and is opposite to the bottom opening of the vacuum casting equipment, only a sand box with a shell is required to be transported into or out of the equipment every time the heat-insulating coating is used, in addition, the heat-insulating coating, a centrifugal disc and a shell device arranged on the centrifugal disc are in a separated state, and the heat-insulating coating, the centrifugal disc and the shell device are not connected and fixed, so that the centrifugal casting can be carried out besides the gravity casting.
Drawings
FIG. 1 is a schematic view of a thermal insulation bag according to an embodiment of the present invention.
FIG. 2 is a schematic view of the heat preservation package being packed into the hearth of the vacuum casting equipment in the embodiment of the invention
Fig. 3 is a schematic diagram illustrating the overall effect of the heating and heat-preserving method for the shell device in the embodiment of the present invention.
Description of the reference numerals
1-an outer shell; 2-high temperature resistant heat shield; 3-a heating element; 4-ceramic bolts and nuts; 5-a thermocouple; 6-a third opening; 7-a second opening; 8-outer wall reinforcing ribs; 9-top reinforcing ribs; 10-flange ring base; 11-a crucible; 12-an induction coil; 13-a first opening; 14-2520 steel bolt and nut; 15-centrifugal discs; 16-a pouring cup; 17-a sand box; 18-a shell body; 19-moly sand; 20-heat preservation bag; 21-vacuum sealing the transmission shaft; 22-flange plate; 23-vacuum casting equipment; 24-a centrifugal tray device; 25-shell device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solution of the present invention will be explained with reference to specific embodiments.
Example 1
As shown in fig. 1-3, there is provided an apparatus for heating and keeping mold shell in vacuum casting equipment, comprising a heat keeping bag 20 for heating or keeping mold shell 25 and a centrifugal tray device 24;
the heat-preservation bag 20 is arranged in a vacuum casting device 23, a second opening 7 is arranged at the bottom of the heat-preservation bag 20, a first opening 13 is arranged at the bottom of the vacuum casting device 23, and the first opening 13 is aligned with the second opening 7;
the centrifugal tray device 24 is used for loading a shell device 25 and can drive the shell device 25 to rotate centrifugally, and the centrifugal tray device 24 and the vacuum centrifugal casting equipment 23 are independent;
when the centrifugal tray means 24 carrying the shell means 25 enters the vacuum centrifugal casting apparatus 23 from the first opening 13, the shell means 25 just enters the thermal insulation pack 20 through the second opening 7, and the centrifugal tray means 24 can be assembled with the first opening 13 to achieve vacuum sealing of the first opening 13.
When the device is used, the shell device 25 is firstly fixed on the centrifugal tray device 24 in the external environment, then the centrifugal tray device 24 carrying the shell device 25 is fed from the first opening 13 at the bottom of the vacuum casting device 23, at this time, the shell device 25 is fed into the heat-preserving bag 20 through the second opening 7 at the bottom of the heat-preserving bag 20, then the first opening 13 at the bottom of the vacuum casting device 23 is sealed through the assembly connection between the centrifugal tray device 24 and the first opening 13, the complete vacuum sealing inside the vacuum casting device 23 is ensured, then the vacuum is pumped, and the heat-preserving bag 20 is operated to heat or preserve heat for the shell device 25.
The molding device 25 may be the molding body 18 or the molding box 17 with the molding shell, and the molding box 17 with the molding shell is filled with mullite sand 19 between the molding box and the molding shell inside.
And the centrifugal tray device 24 may adopt the following structure: the centrifugal device comprises a centrifugal disc 15 for fixing the shell device 25, a flange plate 22 positioned below the centrifugal disc 15 and a vacuum sealing transmission shaft 21 fixed at the lower end of the center of the centrifugal disc 15; the vacuum sealing transmission shaft 21 penetrates through the flange plate 22 and is rotatably connected with the flange plate 22, and a flange ring matched with the flange plate 22 is further arranged at the lower end of the first opening 13;
to facilitate assembly and use of the centrifuge tray assembly 24, the first opening 13 may be contoured to a circular configuration;
the flange plate 22 and the flange ring at the lower end of the first opening 13 can be assembled in the following way: arranging a flange ring at the lower end of the first opening 13, wherein the flange ring can be uniformly provided with a plurality of first through holes, and the edge of the flange plate 22 is provided with a plurality of second through holes corresponding to the first through holes on the flange ring; after the centrifugal tray device 24 is conveyed to the position of the first opening 13, the flange plate 22 and the flange ring are attached tightly, at the moment, the centrifugal tray 15 and the shell device 25 fixed on the centrifugal tray are positioned in the heat preservation bag 20, then the centrifugal tray and the shell device are inserted into the first through hole and the second through hole by using bolts and are fastened by matching nuts, the joint of the flange plate 22 and the flange ring is sealed in a vacuum manner, and after the fastening is finished, the first opening 13 is ensured to be completely sealed in a vacuum manner, so that the vacuum state in the vacuum centrifugal casting equipment 20 is ensured;
the vacuum sealing transmission shaft 21 is used for transmitting power provided by a rotating motor outside the vacuum centrifugal casting equipment 20 to the centrifugal disc 15 to enable the centrifugal disc to rotate centrifugally; and the rotation connection mode between the vacuum sealing transmission shaft 21 and the flange plate 22 also needs to meet the requirement of vacuum sealing connection, so that the vacuum state in the vacuum centrifugal casting equipment 20 is ensured.
The heating and heat-preserving device provided by the embodiment can realize the heating and heat preservation of the shell molding device in the vacuum casting equipment, so that the operation of transferring a shell or a sand box (provided with the shell) which is heated to a very high temperature from special heating equipment to the vacuum casting equipment for installation and fixation in the traditional method is omitted, the labor and the time are saved, the heat radiation to workers in the traditional method is avoided, and the device is safer; in addition, a centrifugal tray device which is mutually independent from vacuum centrifugal casting equipment is designed in the heating and heat-insulating device in a matching way, so that the heat-insulating bag, the centrifugal tray and the shell device arranged on the centrifugal tray are in a separated state, and are not connected and fixed, and not only can gravity pouring be carried out, but also centrifugal pouring can be carried out; the shell molding device can be assembled with the centrifugal disc from the external environment, and then the shell molding device is conveyed into the heat-preservation bag at the bottom of the vacuum casting equipment; compared with the traditional shell preheating method, the heating and heat-preserving device can synchronously carry out the heating and heat preservation of the shell device, the vacuumizing of the vacuum casting equipment and the heating and smelting process, and effectively shortens the process period compared with the traditional technical method.
In a realizable manner, the thermal insulation pack 20 can be designed into a cylindrical structure, which is suitable for centrifugal rotation movement, facilitates centrifugal casting and facilitates uniform heating;
a third opening 6 is formed in the top of the heat-insulating bag 20, and a sprue cup 16 or a diversion trench is arranged at the third opening 6; the lower end of the sprue cup 16 or the diversion trench is opposite to a sprue of the shell device, so that the tilting crucible 11 can be conveniently subjected to gravity pouring or centrifugal pouring after smelting is finished;
in addition, in order to make the centrifugal casting effect better, the third opening 6, the second opening and the first opening 13 are all set to be circular, and the centers of the three circular openings are ensured to be on the same straight line and to be located in the center of the cylindrical heat preservation bag 20.
The bottom of the thermal insulation bag 20 is also fixedly provided with a flange ring base 10, and the flange ring base 10 and the bottom of the vacuum casting equipment 23 can be connected and fastened through bolts and nuts 14 made of GH4169 alloy, so that the thermal insulation bag 20 is firmly installed in the vacuum casting equipment 23.
In an achievable mode, the thermal insulation bag 20 comprises an outer shell 1 and a heating body 3 arranged inside the outer shell 1, and the heating body 3 is connected with an external power supply to realize electrification heating;
the outer shell 1 is a rigid structure having sufficient strength and a certain heat resistance and capable of supporting the entire thermal insulation pack 20, and for example, 2520 steel may be used;
the heating body 3 can be formed by twisting molybdenum wires, for example, 6 molybdenum wires with the diameter of 2mm are twisted and braided into a uniform wavy molybdenum strip which is used as a heat source for heating, and the heating is realized by supplying current from a power supply outside the equipment, wherein the power supply can adopt a 3-phase power supply with the highest voltage of 100V; the heating temperature of the heat preservation bag can reach 1200 ℃, and the heating rate can reach 20 ℃/min;
in addition, the power supply of the heating element 3 can also be connected to a temperature control device (programmable controller) outside the equipment for controlling the heating and heat preservation operation and monitoring the internal temperature, and correspondingly, a thermocouple 5 can be arranged in the inner cavity of the heat preservation bag 20 for measuring the temperature; the heating temperature (or heat preservation temperature) and the heating time (or heat preservation time) are set by the temperature control device, so that automatic heating and heat preservation can be realized according to the preset temperature and time; the thermocouple 5 is used for measuring temperature in real time, the temperature can be effectively monitored, and the temperature can be regulated and controlled through the temperature control device, so that the actual temperature of the shell device can be well guaranteed to reach a theoretical preset value during pouring, and compared with a traditional method, the shell device is more stable in heating and heat preservation process.
In conclusion, the design of the insulation bag 20 does not have the transfer process of the sand box with the shell outside the equipment in the high temperature state in the traditional shell preheating method, namely, the problem of unstable heat loss in the traditional shell preheating method is solved, meanwhile, the heating temperature allowed by the shell device is higher, the higher temperature of the shell device is beneficial to mold filling, the cooling speed in the high temperature stage can be adjusted, and stress concentration is better inhibited.
A plurality of layers of high-temperature-resistant heat shields 2 are uniformly arranged inwards in sequence in the outer shell 1, and the heating body 3 is fixed on the inner surface of the innermost high-temperature-resistant heat shield 2 through ceramic bolts and nuts 4; the high-temperature-resistant heat shield 2 is used for preventing temperature from being transmitted from the inside to the outer surface, and preferably adopts 5-10 layers of thin molybdenum plates, and the thickness of the thin molybdenum plates is 2 mm;
a plurality of outer wall reinforcing ribs 8 are further uniformly arranged on the outer wall of the periphery of the outer shell 1, a plurality of top reinforcing ribs 9 are uniformly arranged on the top of the outer shell 1, and 6 reinforcing ribs made of 2520 steel are preferably adopted for the outer wall reinforcing ribs 8 and the top reinforcing ribs 9;
furthermore, the wall thickness of the outer shell 1 is preferably 8 mm; the wall thickness of the outer wall reinforcing rib 8 and the top reinforcing rib 9 is preferably 8 mm; the flange ring base 10 preferably has a wall thickness of 16 mm.
Example 2
The method for realizing shell heating and heat preservation in vacuum casting equipment comprises the following steps:
a first opening 13 is arranged at the bottom of the vacuum centrifugal casting equipment;
arranging a heat preservation bag 20 for heating or preserving heat of a shell device 25 in the vacuum casting equipment, arranging a second opening 7 at the bottom of the heat preservation bag 20, and ensuring that the first opening 13 is aligned with the second opening 7;
a centrifugal tray device which is used for loading the shell device and can drive the shell device to rotate centrifugally is arranged, wherein the centrifugal tray device is independent from the vacuum centrifugal casting equipment;
fixing the shell means to the centrifugal tray means, then feeding the centrifugal tray means 24 carrying the shell means 25 from the first opening 13 into the vacuum centrifugal casting apparatus 23, while the shell means 25 is just entering the thermal insulation pack 20 through the second opening 7, and then assembling the centrifugal tray means 24 with the first opening 13 to achieve vacuum sealing of the first opening 13;
the insulating package 20 is activated to heat or insulate the shell device.
The method for heating and maintaining the shell in the vacuum casting apparatus provided in this embodiment is obviously a method corresponding to the device for heating and maintaining the shell in the vacuum casting apparatus provided in embodiment 1, and therefore details of specific implementation are not described herein again.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
Claims (10)
1. A device for realizing shell heating and heat preservation in vacuum casting equipment is characterized by comprising a heat preservation bag and a centrifugal tray device, wherein the heat preservation bag is used for heating or preserving heat of a shell device;
the heat-insulating bag is arranged in vacuum casting equipment, a second opening is formed in the bottom of the heat-insulating bag, a first opening is formed in the bottom of the vacuum casting equipment, and the first opening is aligned with the second opening;
the centrifugal tray device is used for loading the shell device and can drive the shell device to rotate centrifugally, and the centrifugal tray device and the vacuum centrifugal casting equipment are independent;
when the centrifugal tray device carrying the shell device enters the vacuum centrifugal casting equipment from the first opening, the shell device just enters the heat-preservation bag through the second opening, and the centrifugal tray device can be matched and assembled with the first opening to realize vacuum sealing of the first opening.
2. The apparatus for heating and maintaining shell in vacuum fusion casting equipment as claimed in claim 1, wherein the thermal insulation ladle is cylindrical and has a third opening at the top for receiving a pouring cup or a guiding gutter.
3. The device for heating and maintaining the shell in the vacuum casting equipment as claimed in claim 1, wherein a flange ring base is further fixedly arranged at the bottom of the thermal insulation bag, and the flange ring base and the bottom of the vacuum casting equipment can be connected and fastened through bolts and nuts made of GH4169 alloy.
4. The apparatus for heating and maintaining shell in vacuum fusion casting equipment as claimed in claim 1, wherein the centrifugal tray device comprises a centrifugal plate for fixing the shell device, a flange plate under the centrifugal plate, and a vacuum sealing transmission shaft fixed at the lower end of the center of the centrifugal plate; the vacuum sealing transmission shaft penetrates through the flange plate and is rotationally connected with the flange plate, and a flange ring matched with the flange plate is further arranged at the lower end of the first opening.
5. The device for heating and maintaining the shell in the vacuum casting equipment as claimed in claim 1, wherein the thermal insulation bag comprises an outer shell and a heating element arranged in the outer shell, and the heating element is connected with an external power supply to realize heating by electrifying.
6. The apparatus for heating and maintaining shell in vacuum casting equipment as claimed in claim 5, wherein multiple layers of heat-resistant heat shields are uniformly arranged inside the outer shell in sequence, and the heating element is fixed on the inner surface of the innermost layer of heat-resistant heat shield by ceramic bolts and nuts.
7. The apparatus for heating and maintaining shell in vacuum casting equipment as claimed in claim 6, wherein the heat-resistant heat shield is a thin molybdenum plate, and the heating element is formed by twisting a molybdenum wire.
8. The apparatus for heating and maintaining shell in vacuum casting equipment as claimed in claim 5, wherein the outer shell has a plurality of outer wall ribs uniformly arranged on the outer wall of the periphery, and a plurality of top ribs uniformly arranged on the top of the outer shell.
9. The apparatus of claim 8, wherein the outer shell, the outer wall rib and the top rib are made of 2520 steel.
10. A method for realizing shell heating and heat preservation in vacuum casting equipment is characterized by comprising the following steps:
arranging a first opening at the bottom of the vacuum centrifugal casting equipment;
arranging a heat preservation bag for heating or preserving heat of the shell device in the vacuum casting equipment, arranging a second opening at the bottom of the heat preservation bag, and ensuring that the first opening is aligned with the second opening;
a centrifugal tray device which is used for loading the shell device and can drive the shell device to rotate centrifugally is arranged, wherein the centrifugal tray device is independent from the vacuum centrifugal casting equipment;
fixing the shell device on the centrifugal tray device, then feeding the centrifugal tray device loaded with the shell device into the vacuum centrifugal casting equipment from the first opening, wherein the shell device just enters the heat-preservation bag through the second opening, and then matching and assembling the centrifugal tray device with the first opening to realize vacuum sealing of the first opening;
and starting the heat preservation bag to heat or preserve heat of the shell device.
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| CN202010806645.XA CN112059151A (en) | 2020-08-12 | 2020-08-12 | Method and device for realizing shell heating and heat preservation in vacuum casting equipment |
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| CN202010806645.XA CN112059151A (en) | 2020-08-12 | 2020-08-12 | Method and device for realizing shell heating and heat preservation in vacuum casting equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309550A (en) * | 2021-12-31 | 2022-04-12 | 江苏永瀚特种合金技术股份有限公司 | Device and method for casting integral fine grains based on local area temperature adjustable system |
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