前苏联专利SU1722218A3 Casting method by vacuum suction into gas-tight mould, and device therefor

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优先权

专利摘要:
The invention relates to foundry, in particular, to casting by vacuum suction of reactive metals. The purpose of the invention is to simplify the process, increase the efficiency and reduce the time for purging the system and filling it with an inert gas. The essence of the invention is that the sealed chamber 1 with the form 17 and the metal pipe 21
公开号:SU1722218A3
申请号:SU884355727
申请日:1988-05-06
公开日:1992-03-23
发明作者:Д.Чендли Джордж
申请人:Метал Кастинг Технолоджи, Инк (Фирма)；
IPC主号:

专利说明:

The invention relates to foundry, in particular, to casting by vacuum suction and under the pressure drop of reactive metals.
The aim of the invention is to simplify the process, increase efficiency and reduce the time required to purge the system and fill it with an inert gas.
Figure 1 shows the device
general view, in FIG. 2 - the same, when filling the mold with metal, in FIG. 3, the same, general view, the embodiment of FIG, also, when filling the mold with metal, in FIG. 5, a crucible with a casing when loading metal,
. The device contains a crucible 1, placed in the casing 2 with a removable cover 3, placed on the side walls -. in the casing through the seal 4, the casing can be made cooled, crucible 1 has a lining 5 with inductor 6. The cover 3 has an opening 7, the same opening also exists in the heat shield 8,
Above the opening 7 there is another removable cover 9 with a seal 10. In the center of the cover 9 there is a small opening 11 for the entry of a thermocouple. The casing 2 through a pipeline 12 is connected with a vacuum system, and through a pipeline 13 with a source of inert gas. The molding unit contains an airtight chamber And mounted on a vertically moving support 15. In the lower part of the chamber there is an opening 16 for mounting the casting mold 17, which in FIG. 1 is represented as a shell mold with a stopper 18 for feeding metal into
Lost 19 forms. In the upper part of the chamber I is connected by a pipeline 20
vacuum system. Form 17 also has a metal pipe 21 with a flange 22 and a free end 23. Slate 22 is hermetically mounted between the support wall of the chamber and the lower end of the form
17 around the entrance hole 2k stand 18. The hydraulic cylinder 25 is connected to the support 15 and provides relative movement of the crucible 1 and the chamber. The latter consists of two halves
with cooling means. In addition, the chamber 14 is connected by means of the pipeline 26 with means for creating a lower pressure in the interior of the mold as compared with the chamber. This means may have a porous plug 27, impermeable to metal and permeable to gas. The mouth of the pipe 26 is sealed over the stopper 27 by means of a seal 28.
Leakage between channel 29 and chamber I is prevented by seals 30. Between cover 3 of the casing and the molding unit is a flexible compressible screen 31 made of refractory material such as fiberglass. This screen maintains the required distance between the metal mirror in the crucible and the source of air penetration into the crucible while removing
cover 9. When using this device, such a source is a hole 16 located relatively far from the melt,
Therefore, the cover 9 can be removed during the purging of the casing 2 with argon. Argon purging is carried out at a pressure above atmospheric, with argon filling the screen 31 and going through its openings for
five
prevent air from entering through the screen. The distance of the surface of the liquid metal from the only potential air source (opening 16-) prevents the circulating streams (Brillus zone) from drawing air into the melt. This distance is at least 20 cm, but it may also be $ c.
The method is carried out as follows.
The chamber 1 is installed by the free end 23 of the metal pipe 21 over the crucible casing hole 7, while the cover 9 is preliminarily removed. By sealing the upper flange 22 of the metal pipe 21 between the bottom wall of the camera 1 and the lower end of the form 17 around the hole 2 and using the shield 31 designed to maintain the pressure of the inert gas in the casing 2 above atmospheric, air is prevented from entering the crucible casing through the opening 7. When using an inert gas such as argon, which is several times denser than air, or nitrogen, the density of which is only slightly lower than the density of air, it is possible to easily regulate the flow of gas to prevent air from entering the casing 2 through the opening 7.
During casting, the chamber is moved by means of a hydraulic cylinder 25, which provides for relative movement of the metal pipe 21 and the crucible case 2 for supplying the metal pipe through the opening 7 in the case. FIG. 2 shows how the end 23 of the metal conduit 21 is immersed in the liquid metal in the crucible, as well as the relative movement of the end 23 of the metal conduit and the casing 2 in a relatively flat form. As the end of the metal pipe 23 moves, a reduced pressure drop is created in the inner part of the form 17 through one hundred to 18 due to the use of the connection of the pipe 26 to the vacuum system, which ensures the supply of argon and then the liquid metal through the metal line and one hundred and eighteen also causes the formation of a sidestream in the cavity 19 of the mold 17. At the same time, the second pressure equal to or higher than the pressure supplied through the pipe 26, but lower than the pressure of the liquid metal in the crucible 1,
222.186
is supplied to the chamber I and thus to the outer part of the mold 17 through the conduit 20 to ensure that the mold cavities 19 are filled with liquid metal. The magnitude of the second pressure is sufficient only to fill the cavities of the mold 19. After completion of the filling, the pressure surrounding the 17 | can be increased while maintaining low pressure in the interior of the mold to improve the quality of the part and reduce tensile stresses in the mold. Pressure
J5 rises in chamber I by supplying an inert gas through connection 32 until the molded metal remains at a reactive temperature.
20
After molding is completed, these pressures are reduced to atmospheric. Then the chamber 1 opens and the filled mold 17 and metal wire 21 are removed to prepare for the next molding cycle. Screen 31, due to the possibility of reverse compression, restores its original shape. Cover 9 maybe
30 is installed above the opening 7 in the casing 2, if the next mold is not ready to be poured. If the pipe 26 is not used, the described method changes only in that low pressure for filling the cavities of the mold is created completely in the chamber 1 through the pipe 20, while the outer lower pressure on the mold is transmitted to the inside through
40 is her porous body. Usually, the results are not as good as when using two vacuum compounds operating at different pressures. Impurities to remove impurities
35
from the mold system with the same pressure efficiency at the time of filling should be lower, but the weight of the metal on the mold increases. However, the method and device have significant advantages compared with the known device and without the use of the pipeline 26. In FIG. 3 another method of protecting the liquid metal from air pollution is illustrated. The crucible cover 3 is mounted telescopically on the elements 33 and supported by hydraulic cylinders (not shown), which are spread over
The metal in the crucible is from hole 7 (the nearest air source) and maintains this distance at a level of about 20 cm or more. At this distance, contamination by circulating air streams is prevented when cap 9 is removed when argon is supplied.
During casting (FIG. 4), when the protrusions of the metal conduit 21 are in contact with the lid 3 of the crucible casing 2 as relative to the movement of the metal conductor and the crucible casing towards OTHER to a friend, the movable elements 33 are meshed and are compressed. 33 return to the starting position. When the lower part of the chamber And and the cover 3 is joined, the opening 7 is sealed to prevent any significant amount of air from entering when the movable element 33 is compressed and returns to its original position after filling in the form.
In FIG. 5, for the initial supply of metal to the crucible in an atmosphere of inert gas, which is done only periodically, a replaceable cover 3 is provided which is impermeable, larger and stronger than cover E, and can also withstand the evacuation of the cover 2 of the crucible to a high degree vacuum. When the cover 9 is removed, the chamber Ik of the form and the metal conductor 21 (Fig. 1) are removed, the ingot 35 intended for melting the metal is placed in the crucible through the holes 7 and 36 and the replaceable cover 31 is removably mounted on the cover 3 of the casing by means of a seal 37 and closes the opening 7. The casing is evacuated through line 13 to substantially remove air and the inductor 6 is turned on to melt the ingot. When the melt reaches the desired temperature, the inert gas is supplied to the casing 13 to the desired pressure through the pipe 13. place using the mounting rod (not shown), and the removable cover is removed. Since the lid 3 is installed at the periphery and closes the removable upper lid 3 of the casing 2, the lid 3 is not exposed to the pressure differential of the atmosphere on one surface
whining and and high vacuum on the other and how the cover 9 can be easier and easier to handle compared to the cover.
The proposed form is of the high temperature ceramic type for combination parts. However, other types of molds can be used, for example, high-temperature molds from molding sand for single and combined parts of various sizes and shapes.

权利要求:
Claims (3)
[1]
15 Formula Fig.
0
five
1. A method of pouring by vacuum suction into a gas-permeable form, including placing a gas-permeable form with a stand and metal pipe in a sealed chamber, feeding metal into a crucible with a casing filled with an inert gas, moving
and immersing the lower end of the metal pipe in a crucible with liquid metal through an opening in the casing cover, creating a vacuum in a sealed chamber, filling the mold with metal, removing a metal wire from the crucible, characterized in that, in order to simplify the process, increase efficiency and reduce the time purging the system and adding it with an inert gas between the liquid metal mirror in the crucible and the source of air penetration into the housing maintain a distance of at least 20 cm during the whole process, except filling the form scrap.
2. Method pop. 1, which differs from the fact that, in order to fill the mold with an inert gas, the hermetic chamber is evacuated during the movement of the metal conduit to the crucible.
[2]
3. Method pop. 1, which differs from the fact that in the upper part of the stand, in the process of filling the mold with metal, a deeper vacuum is created than in a sealed chamber.
[3]
A. The method of pop. 1, which differs from the fact that the distance between the source of air penetration into the casing and the mirror of the liquid metal is +5 cm.
0
five
0
five
0
five
5. The method according to claim 1, 1 and 2, so that, in order to prevent air from entering the room.
zhuh, inert gas pressure in it support above atmospheric.
6. The method according to claim, characterized in that the dense gas with an argon density which is inert close to
7v A device for casting by vacuum suction into a gas-permeable form, containing a sealed chamber, a gas-permeable form placed in it, one hundred percent, connected to the cavity of the form and the metal wire with a free end, a crucible for melting metal, placed in a casing having a hole in lid for introducing metal-wire, means for creating vacuum in a sealed chamber and case and for supplying inert gas to the case, means for raising and lowering the sealed chamber with a shape that, in order to simplify the process of raising efficiency and reduce the time to purge the system and fill it with an inert gas, it is equipped with a moving element to establish and maintain a specified distance between
A mirror of the metal in the crucible and the source of air penetration in the crucible.
8. The device according to claim 7, which is equipped with a means for creating a deeper vacuum in the stand in comparison with the hermetic chamber.
9. The device in accordance with claim 7, clause 7, which is based on the fact that the movable element is designed as a flexible compressible screen.
i
10. The device according to claim 7, characterized in that the movable element is made in the form of a cover of the housing telescopically mounted therein.
11. The device according to claim 7, characterized in that it is provided with a removable cover, which is hermetically mounted on the casing during the smelting of the metal,
Priority on item m:
07.05.87 and 30.03.88 in paragraphs 1-3; Sr8; 11j
03/30/88 in paragraphs 4, 9, Y.
/
29 26
P 30
33
if
b; five
2
FIG. five

类似技术:

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同族专利:

公开号 | 公开日

YU89588A|1990-04-30|

GB8810587D0|1988-06-08|

GB2204816B|1991-01-30|

AU610878B2|1991-05-30|

IN170880B|1992-06-06|

DE3815828A1|1988-11-17|

FR2614812A1|1988-11-10|

FR2614812B1|1993-07-23|

DE3815828C2|1992-11-05|

IT8867421D0|1988-05-06|

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CA1317437C|1993-05-11|

CN88102623A|1988-12-14|

CN1015519B|1992-02-19|

AU1538288A|1988-11-10|

BR8802221A|1988-12-06|

JPS6440162A|1989-02-10|

GB2204816A|1988-11-23|

IT1219274B|1990-05-03|

JPH0586312B2|1993-12-10|

引用文献:

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US3900064A|1972-12-04|1975-08-19|Hitchiner Manufacturing Co|Metal casting|

US3863206A|1974-03-12|1975-01-28|Lee C Rabie|Digital Vehicle Detector|

US4589466A|1984-02-27|1986-05-20|Hitchiner Manufacturing Co., Inc.|Metal casting|

US4673025A|1986-04-04|1987-06-16|Inductotherm Corporation|Apparatus and method for maintaining constant molten metal level in metal casting|

JPH06195761A|1992-12-22|1994-07-15|Matsushita Electric Ind Co Ltd|Manufacture for nickel stamper and manufacturing apparatus therefor|GB8915826D0|1989-07-11|1989-08-31|Auto Alloys Foundries Limited|Casting of metals|

JP2541341B2|1990-05-15|1996-10-09|大同特殊鋼株式会社|Precision casting method and precision casting apparatus for Ti and Ti alloy|

US5044420A|1990-08-13|1991-09-03|General Motors Corporation|Vacuum-assisted, countergravity casting apparatus and method|

CA2049228C|1990-09-06|1996-10-15|George D. Chandley|Countergravity casting using particulate supported thin walled investment shell mold|

JP2791529B2|1992-03-26|1998-08-27|日立金属株式会社|Differential pressure casting method and differential pressure casting device|

JP3039132B2|1992-05-08|2000-05-08|富士電機株式会社|Low pressure casting equipment|

FR2705044B1|1993-05-10|1995-08-04|Merrien Pierre|LOW PRESSURE PILOT CASTING PROCESS OF A VACUUM MOLD FOR ALUMINUM OR MAGNESIUM ALLOYS AND DEVICE FOR ITS IMPLEMENTATION.|

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DE19906939C2|1999-02-19|2002-09-19|Honsel Ag|Induction crucible furnace and its use for the production of castings from particle-reinforced aluminum and magnesium alloys|

CN1295046C|2004-09-29|2007-01-17|北京交通大学|Pressure adjustable casting method and crucible therefor|

WO2006091619A2|2005-02-22|2006-08-31|Milwaukee School Of Engineering|Casting process|

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

US4733487A| true| 1987-05-07|1987-05-07|

US17523188A| true| 1988-03-30|1988-03-30|

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