CN1190285C - 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 PDF

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Publication number
CN1190285C
CN1190285C CNB021156387A CN02115638A CN1190285C CN 1190285 C CN1190285 C CN 1190285C CN B021156387 A CNB021156387 A CN B021156387A CN 02115638 A CN02115638 A CN 02115638A CN 1190285 C CN1190285 C CN 1190285C
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China
Prior art keywords
pouring
magnesium
furnace
vacuum
casting
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CNB021156387A
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Chinese (zh)
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CN1382542A (en
Inventor
樊自田
董选普
黄乃瑜
胡敏
田学峰
吴和保
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华中科技大学
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Priority to CNB021156387A priority Critical patent/CN1190285C/en
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Abstract

The present invention relates to a method and a device thereof for counter-gravity casting, which can solve the problems of high requirements to a casting mold, complicated pressure regulating method and easy oxidation when liquid alloy is poured in the existing counter-gravity casting. The method comprises the following steps: (1) a casting pattern of a lost mold is put in a bottom pouring type sand box, and molding sand is added to be compactly vibrated; (2) molten magnesium and aluminum alloy is sent into a pouring furnace, and protective gas is led in; (3) pressure controllable inert gas is led in the pouring furnace, the molten alloy enters the sand box under the action of the inert gas, the casting pattern of the lost mold is gasified, and pouring is realized. The device is composed of a pouring furnace, a pouring platform on a furnace cover, a sand box placed on the pouring platform and a pouring pipe communicating the pouring furnace with the sand box, wherein a crucible with a stainless steel lining is arranged in the pouring furnace; a heat-insulation heating coil is coated outside the pouring pipe; the pouring furnace cover has a passage for protective gas and pressure controllable inert gas. The present invention combines the advantages of techniques of vacuum lost mold casting and counter-gravity casting and is suitable for the large-scale production of high-precision complicated magnesium and aluminum alloy castings.

Description

Magnesium, Antigravitational vacuum method and apparatus for asting mg allor or al alloy with lost mould
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 the lost foam casting apperance in the sandbox of bottom filling, 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 its pressure effect, with the gasification of lost foam casting apperance, forms magnesium, aluminium alloy castings after the cooled and solidified.
The described magnesium of claim 1, aluminium alloy antigravity lost-foam casting method is characterized in that realizing sandbox being vacuumized vacuum-0.08~0.02MPa when type is filled in antigravity cast.
Claim 1 or 2 described magnesium, aluminium alloy antigravity lost-foam casting method, the inert gas pressure that it is characterized in that filling the type cast is adjusted variation in 0.01~0.5MPa, and protective gas pressure changes in 0.005~0.05MPa.
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 with SF 6Mist with aforementioned gas; The inert gas of described controllable pressure is CO 2Or Ar.
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 with SF 6Mist with aforementioned gas; The inert gas of described controllable pressure is CO 2Or Ar.
A kind of 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; between stainless steel furnace lining and the cast furnace wall is the insulation layer; (2) be positioned at the gate spool that the pouring platform total value sends out 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.
Magnesium as claimed in claim 4, aluminium alloy antigravity founding casing with vacuum equipment; it is characterized in that: have vacuum lead on (1) described sandbox wall; (2) the 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 disappearance mould foamed plastics cast pattern that vibration ramming is good hang by track or car and send equipment to send into the pouring platform top, and contraposition is to be poured, sandbox is vacuumized, immediately toward the interior inert gas CO that feeds controllable pressure of 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; by electromagnetic pump send into preserve moisture in the pouring furnace to be poured; charge into protective gas Ar in the pouring furnace; pressure 0.008MPa; sandbox is vacuumized, vacuum-0.06MPa, feeding can be shaken the inert gas of pressure also for 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 2 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 stove spring 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 in the sandbox of bottom filling, 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 its 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 founding casing with vacuum method is characterized in that realizing sandbox being vacuumized when type is filled in the antigravity cast, vacuum-0.08~-0.02MPa.
3. claim 1 or 2 described magnesium, aluminium alloy antigravity founding casing with vacuum 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 founding casing with vacuum method is characterized in that described protective gas can be CO 2, SO 2, Ar, SF 6Perhaps with 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 founding casing with vacuum method is characterized in that described protective gas can be CO 2, SO 2, Ar, SF 6Perhaps with 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 the gate spool that the pouring platform total value sends out 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.
CNB021156387A 2002-03-26 2002-03-26 Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould CN1190285C (en)

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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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CN1190285C true CN1190285C (en) 2005-02-23

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CN101468385B (en) * 2007-12-29 2010-11-24 中国船舶重工集团公司第七二五研究所 Molten metal linkage conveyer device for preparing metal powder and casting part
CN103567381A (en) * 2012-07-25 2014-02-12 西安轨道交通装备有限责任公司 Production technology of corner iron support used for external heating or external insulation

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CN1317094C (en) * 2005-09-22 2007-05-23 上海交通大学 Antigravity vacuum sucking cast apparatus for aluminium base composite material
CN100391653C (en) * 2005-09-22 2008-06-04 上海交通大学 Low pressure casting process of preparing in-situ aluminium-base composite material
CN100352581C (en) * 2005-12-16 2007-12-05 华中科技大学 Metal glass melt cast moulding method and its device
CN101733387B (en) * 2010-01-21 2012-11-07 安徽中兴华汉机械有限公司 Low pressure casting method of aluminium alloy lost foam
CN101844220A (en) * 2010-05-28 2010-09-29 常州市博海铸件制造有限公司 Suction injecting method and device for vacuum negative pressure lost foam
CN102380578B (en) * 2011-11-10 2013-09-04 华中科技大学 Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy
CN102773423A (en) * 2012-07-26 2012-11-14 无锡蠡湖叶轮制造有限公司 Full-automatic gravity casting apparatus
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CN103822803A (en) * 2014-02-28 2014-05-28 湖北工业大学 Sand casting tail gas acquisition device and method
CN104001903A (en) * 2014-05-08 2014-08-27 临汾鹏泰伟业有限公司 Metal magnesium refining kettle casting die and manufacturing process thereof
US9517796B2 (en) * 2015-03-09 2016-12-13 Ford Global Technologies, Llc Thin-walled magnesium diecast shock tower for use in a vehicle
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CN105945258B (en) * 2016-06-03 2018-05-04 扬州峰明金属制品有限公司 A kind of low pressure investment precision casting technology
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CN101468385B (en) * 2007-12-29 2010-11-24 中国船舶重工集团公司第七二五研究所 Molten metal linkage conveyer device for preparing metal powder and casting part
CN103567381A (en) * 2012-07-25 2014-02-12 西安轨道交通装备有限责任公司 Production technology of corner iron support used for external heating or external insulation
CN103567381B (en) * 2012-07-25 2015-10-28 西安轨道交通装备有限责任公司 External heat or the Surgery therapy production technology of bight Zhi Tie

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EE01 Entry into force of recordation of patent licensing contract

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

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