CN1382542A - Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould - Google Patents
Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould Download PDFInfo
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- CN1382542A CN1382542A CN 02115638 CN02115638A CN1382542A CN 1382542 A CN1382542 A CN 1382542A CN 02115638 CN02115638 CN 02115638 CN 02115638 A CN02115638 A CN 02115638A CN 1382542 A CN1382542 A CN 1382542A
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Abstract
An antigravitational casting technology includes putting a lost mould in a bottom running type sand box, adding sand, vibration compacting, loading molten MgAl alloy in filler while introducing protecting gas, introducing the pressure controllable inertial gas to the filler, and pouring the molten alloy into said sand box to gasify said list mould. Its apparatus is composed of filler, sand box, pouring pipe, crucible in the filler, and heating coil surrounding said pouring pipe. It is suitable for precision casting.
Description
Technical field
The invention belongs to the alloy precision casting field, be specifically related to Countergravity casting method and equipment thereof.
Background technology
At present, the casting method of magnesium alloy parts is comparatively single, adopt compression casting method under the gravity to be shaped (account for～90%) mostly, and minority is all bad with the precision and the surface roughness of the Mg alloy castings of the shaping of the sand casting gravity under.The casting method of aluminum alloy part is more relatively, and commonly used has: permanent mold casting, compression casting and the lost foam casting of gravity lower charging type casting solidification, the low pressure casting, counter-pressure casting, the fusible pattern that reach antigravity lower charging type casting solidification are inhaled casting etc.
Cast makes foundry goods produce to owe casting flaws such as casting, loose, oxide inclusion easily under the gravity, and the aluminium alloy gravity under disappears to cast and also is easy to generate defectives such as pore and pin hole.In permanent mold casting, compression casting, low pressure casting, counter-pressure casting, all be to adopt metal type dies.The gas permeability of metal mold is poor, easy to produce the defectives such as gas and misrun of spraining, and when mold filling pressure is higher, as compression casting, also easily produces defectives such as rolling up gas; The structure of metal type dies makes the structure of the foundry goods of its production also exist certain limitation, is difficult to produce the foundry goods of band complicated inner cavity structure.
Antigravity casting is a method of utilizing pressure differential antigravity ground pouring liquid metal.In order to overcome the limitation of common Countergravity casting method, that is: require casting mold to have preferably gas permeability, require casting mold to have higher intensity, some Countergravity casting method, inhale casting, low pressure casting as fusible pattern, feeding pressure when metal freezing is not enough, Ceng Jianmin, Zhou Yao and proposed a kind of pressure-adjusting casting method (CN1034876A).But pressure-adjusting casting method control relative complex is unsuitable for a large amount of industrial production, and can only be used for the production of aluminium alloy castings.
In addition, magnesium, very easily oxidation, air-breathing when aluminium alloy contacts with air under the liquid state easily form a large amount of oxidation foreign material and pore in foundry goods.Usually need the additional gas protection when magnesium, aluminum alloy melting cast.
Summary of the invention
Magnesium, Antigravitational vacuum method and apparatus for asting mg allor or al alloy with lost mould that the present invention proposes can solve the problems referred to above in magnesium, the precision aluminium-alloy casting.
A kind of magnesium of the present invention, aluminium alloy antigravity founding casing with vacuum method; comprise the steps: that (1) put into the bottom filling sandbox with the lost foam casting apperance; add molding sand; vibration ramming; (2) magnesium, the Al-alloy metal liquid after the fusing refining; it is to be poured to send into the interior insulation of pouring furnace; feed protective gas in the pouring furnace; (3) inert gas of feeding controllable pressure in the pouring furnace; magnesium, Al-alloy metal liquid are entered by the sandbox bottom; with the gasification of lost foam casting apperance, form magnesium, aluminium alloy castings after the cooled and solidified.
Described magnesium, aluminium alloy antigravity lost-foam casting method is characterized in that realizing sandbox being vacuumized when type is filled in antigravity cast, vacuum-0.08～-0.01mpa.
Described magnesium, aluminium alloy antigravity lost-foam casting method, it is further characterized in that the inert gas pressure that fills type cast adjusts variation in 0.01～0.5mpa, protective gas pressure changes in 0.005～0.05mpa.
Described magnesium, aluminium alloy antigravity lost-foam casting method, described protective gas can be CO
2, SO
2, Ar, SF
6Perhaps SF
6Mist with aforementioned gas; The inert gas of described controllable pressure can be CO
2Or Ar.
A kind of magnesium of the present invention; aluminium alloy antigravity founding casing with vacuum equipment; include crucible in the pouring furnace; pouring furnace covers the placement pouring platform; place the sandbox of bottom opening on the cast table top; gate spool is fixed in the cast bell and passes through pouring platform connection crucible and sandbox; it is characterized in that: (1) described crucible has the stainless steel furnace lining; between stainless steel furnace lining and the cast furnace wall is the insulation layer; (2) be positioned at pouring platform gate spool partly and clad the insulation heater coil outward, (3) pouring furnace covers the passage that has logical protective gas and logical controllable pressure inert gas respectively.
Described magnesium, aluminium alloy antigravity founding casing with vacuum equipment, it is further characterized in that: have vacuum lead on (1) described sandbox wall, (2) gate spool upper end has the passage of logical protective gas, and (3) pouring furnace covers liquid level sensor is installed.
Advantage of the present invention is: the antigravity low pressure casting of founding casing with vacuum and controllable pressure is combined dexterously, combine the technical advantage of founding casing with vacuum, antigravity casting and adjustable pressure casting, can cast out the magnalium gold foundry goods of precision, thin-walled, complexity; Whole cast and cavity filling process are all finished under the reducing atmosphere after the protection of inert gas and the gasification of disappearance mould, are fit to very much the casting characteristic of magnesium, aluminium alloy; Realize the automation of production process easily, the present invention is suitable for the large-scale production of magnesium, aluminium alloy castings.
The present invention is applicable to a large amount of suitability for industrialized production of industry complexity such as automobile, Aeronautics and Astronautics, thin-walled, high-precision magnesium, aluminium alloy castings.
Description of drawings
Fig. 1 is the schematic diagram of Casting Equipment involved in the present invention.
The specific embodiment
Embodiment 1:
Magnesium, Al-alloy metal liquid after the melting furnace fusing refining, it is to be poured to send in the pouring furnace insulation by siphon pipe, charges into protective gas CO in the pouring furnace
2, pressure 0.02mpa, the sandbox that contains foamed plastics cast pattern (disappearance mould) that vibration ramming is good are by track or hang and send equipment to send into pouring platform top, and contraposition is to be poured, and sandbox is vacuumized, and feeds the inert gas CO of controllable pressure immediately in the pouring furnace
2, pressure is 0.2mpa, vacuum-0.04mpa when vacuumizing realizes the antigravity vacuum casting.Embodiment 2:
Magnesium, Al-alloy metal liquid after the melting furnace fusing refining; it is to be poured to send in the pouring furnace insulation by electromagnetic pump; charge into protective gas Ar in the pouring furnace; pressure 0.008mpa; sandbox is vacuumized, vacuum-0.06mpa, the inert gas that feeds controllable pressure also is Ar; pressure 0.05mpa, other is with embodiment 1.
The equipment of realization antigravity vacuum casting as shown in Figure 1; wherein 1 is the lost foam casting apperance, and 2 is the bottom filling sandbox, and 3 are filling molding sand wherein; 4 is the vacuum lead of sandbox; 5 is the roller-way of mobile sandbox, and 6 is pouring platform, places on the bell 8 of pouring furnace 7; 9 is crucible; 10 is the stainless steel furnace lining, and 11 is heater coil, and 12 is the insulation layer; 13 is gate spool; 14 are insulation heater coil, 15 passages for logical protective gas, 16 passages for logical controllable pressure inert gas; 17 is liquid level sensor; to the magnesium in the crucible; control is detected in the molten aluminium alloy position, and 18 is melting furnace, and 19 is siphon pipe.
Claims (7)
1. a magnesium, aluminium alloy antigravity founding casing with vacuum method comprise the steps:
(1) the lost foam casting apperance is put into the bottom filling sandbox, add molding sand, vibration ramming,
(2) magnesium, the Al-alloy metal liquid after the fusing refining, it is to be poured to send into the interior insulation of pouring furnace, feeds protective gas in the pouring furnace,
(3) inert gas of feeding controllable pressure in the pouring furnace makes magnesium, Al-alloy metal liquid be entered by the sandbox bottom under the controllable pressure effect, with the gasification of lost foam casting apperance, forms magnesium, aluminium alloy castings after the cooled and solidified.
2. the described magnesium of claim 1, aluminium alloy antigravity lost-foam casting method is characterized in that realizing sandbox being vacuumized when type is filled in the antigravity cast, vacuum-0.08～-0.01mpa.
3. claim 1 or 2 described magnesium, aluminium alloy antigravity lost-foam casting method is characterized in that the inert gas pressure that fills the type cast adjusts variation in 0.01～0.5mpa, and protective gas pressure changes in 0.005～0.05mpa.
4. claim 1 or 2 described magnesium, aluminium alloy antigravity lost-foam casting method is characterized in that described protective gas can be CO
2, SO
2, Ar, SF
6Perhaps SF
6Mist with aforementioned gas; The inert gas of described controllable pressure is CO
2Or Ar.
5. the described magnesium of claim 3, aluminium alloy antigravity lost-foam casting method is characterized in that described protective gas can be CO
2, SO
2, Ar, SF
6Perhaps SF
6Mist with aforementioned gas; The inert gas of described controllable pressure is CO
2Or Ar.
6. a magnesium, aluminium alloy antigravity founding casing with vacuum equipment, including crucible, pouring furnace in the pouring furnace covers and places the sandbox of placing bottom opening on pouring platform, the cast table top, gate spool is fixed in the cast bell and passes through pouring platform connection crucible and sandbox, it is characterized in that:
(1) described crucible has the stainless steel furnace lining, is the insulation layer between stainless steel furnace lining and the cast furnace wall,
(2) be positioned at pouring platform gate spool partly and clad the insulation heater coil outward,
(3) pouring furnace covers the passage that has logical protective gas and logical controllable pressure inert gas respectively.
7. magnesium as claimed in claim 6, aluminium alloy antigravity founding casing with vacuum equipment is characterized in that:
(1) have vacuum lead on the described sandbox wall,
(2) the gate spool upper end has the passage of logical protective gas,
(3) pouring furnace covers liquid level sensor is installed.
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| CNB021156387A CN1190285C (en) | 2002-03-26 | 2002-03-26 | Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021156387A CN1190285C (en) | 2002-03-26 | 2002-03-26 | Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould |
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| CN1382542A true CN1382542A (en) | 2002-12-04 |
| CN1190285C CN1190285C (en) | 2005-02-23 |
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Assignee: Ma'anshan Tianma Special Steel Casting Co. Ltd. Assignor: Huazhong University of Science and Technology Contract fulfillment period: 2009.6.26 to 2015.6.25 contract change Contract record no.: 2009340000222 Denomination of invention: Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould Granted publication date: 20050223 License type: General permission Record date: 2009.8.26 |
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Free format text: COMMON LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.26 TO 2015.6.25; CHANGE OF CONTRACT Name of requester: MAANSHAN CITY TIANMA CITY STEEL CASTING CO., LTD. Effective date: 20090826 |
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