CN1317093C - Vacuum sucking cast process of preparing magnesium base composite material - Google Patents
Vacuum sucking cast process of preparing magnesium base composite material Download PDFInfo
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- CN1317093C CN1317093C CNB2005100298844A CN200510029884A CN1317093C CN 1317093 C CN1317093 C CN 1317093C CN B2005100298844 A CNB2005100298844 A CN B2005100298844A CN 200510029884 A CN200510029884 A CN 200510029884A CN 1317093 C CN1317093 C CN 1317093C
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- vacuum
- base composite
- composite material
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- magnesium
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Abstract
The present invention relates to a preparation method of a magnesium-base composite material by suction and casting in vacuum, which belongs to the field of a casting technique. The preparation method comprises the following steps: (1) a preheated shuttering is fixed to a partition board by a shuttering fixing jacket, and then a mixed protective gas is introduced; (2) a stop valve is opened, a sealed cavity is vacuumized to reach a vacuum dynamic balance state, and the vacuum state is kept; (3) the vacuum state is eliminated, and a just well-refined magnesium-base composite material fusant is quickly cast in the shuttering cavity; when the magnesium-base composite material fusant is cast to the head of the shuttering, a vacuum stop valve is opened, the shuttering cavity is vacuumized so that the shuttering cavity is filled with the magnesium-base composite material metal liquid in vacuum, and the vacuum state is kept until the metal liquid is solidified completely. The present invention provides a novel method for casting and forming by suction and casting in vacuum, the method of suction and casting in vacuum is applied to the preparation of the magnesium-base composite material and magnesium alloy component parts, and thin-wall complicated magnesium-base composite materials and magnesium alloy cast parts are molded successfully.
Description
Technical field
What the present invention relates to is that a kind of preparation method's of casting technology field, particularly a kind of magnesium base composite material vacuum is inhaled the preparation method water.
Background technology
The former magnesium output of China occupies first place in the world, and accounts for 1/3rd of global output, and along with the development of Domestic Automotive Industry, the magnesium base composite material technology has broad application prospects.Magnesium base composite material is a class hi tech and new material that develops rapidly in the last thirty years, have high specific stiffness, specific strength, excellent high-temperature performance, lower thermal coefficient of expansion, and good wearability, traditional material can be replaced in a lot of fields, as iron and steel, aluminium alloy etc.Compare with aluminum matrix composite, magnesium base composite material except that have with the former essentially identical performance characteristics, its density is than the lower (ρ=2.0g/cm of aluminum matrix composite
3), range of application is wider.The method of magnesium alloy die casting commonly used is shaped, the same with other diecasting alloys, traditional die-casting technique makes liquid magnesium alloy with turbulent flow and disperse state filling die casting die cavity at a high speed, gas at high temperature is easy to be dissolved in the diecasting alloys, perhaps forms many disperses and is distributed in the interior little pore of high pressure of die casting.In order to eliminate this defective, improve the inherent quality of die casting, enlarge the range of application of die casting, for the shaping of magnesium alloy, some new methods have been arranged again over nearly 20 years, comprising pore-free die casting, semi-solid state metal rheological or thixotroping die casting and extrusion casint.The method that adopts the vacuum suction to water for magnesium base composite material is shaped, and does not also have the data report.
Find through document prior art, Chinese patent application number: 200410023505.6, denomination of invention: " a kind of sand mold negative pressure gravity casting method ", this method is made sand mold according to common sand sell moulding method on a metab, and sand mold is produced in the protective metal shell that has steam vent, cover and have the pressing plate formation foundry goods die cavity that waters the road junction, in the sand mold bottom vacuum passage is installed then, the casting of molten metal while vacuumizing stops after the cast bleeding.This technology substitutes sandbox in the ordinary sand casting with protective metal shell, and the sand mold die cavity is a cavity, has eliminated the influence of disappearance mould foamed plastics gasification rate and decomposition; But this technology mainly is fit to the shaping cast iron part, though mention the casting that can be adapted to non-ferrous alloy in the patent, practice shows, when preparing aluminium alloy and Mg alloy castings with this technology, owing to adopt the influence of common sand mold gas permeability difference, vacuum in its die cavity can not improve, and the thin-wall complicated part that is shaped is very difficult; Adopting the technology of the cast while vacuumizing, be difficult to the aluminium alloy that is shaped, mainly is because aluminium alloy density is much lower than cast iron, and being mingled with and rolling up gas defective during cast is difficult to control.Magnesium alloy is because easy firing, easily oxidation, and density is lower than aluminium alloy, more can not be shaped in this way, more is not suitable for the shaping of magnesium base composite material.
Summary of the invention
The present invention is directed to the deficiencies in the prior art and defective, characteristics in conjunction with magnesium base composite material, a kind of vacuum sucking cast process of preparing of magnesium base composite material is provided, make it that vacuum is inhaled the method water and be applied in the preparation of magnesium-based composite material parts, prepared thin-walled, complicated magnesium base composite material foundry goods.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
(1) formwork with preheating is fixed on the dividing plate with the formwork fixed cover, logical then hybrid protection gas;
(2) open the stop valve that links to each other with vacuum, the sealing die cavity vacuumizes, and keeps a period of time after reaching the vacuum dynamic balancing;
(3) vacuum breaker, rapidly that firm refining is good magnesium base composite material melt cast are being poured into formwork when watering open height in the formwork die cavity, open vaccum stop valve, vacuumize, make the magnesium base composite material metal liquid at vacuum retrofilling formwork die cavity, keep vacuum, up to solidifying fully.
In the step (1), formwork preheating: 100～400 ℃; The logical protective gas of formwork mouth is: CO
2, SO
2, Ar
2And SF
6In two or more mist, gas flow: 3L/min～50L/min.
In the step (2), vacuum retention time 1～15min, vacuum is when reaching the vacuum dynamic balancing :-0.1～-0.05Mpa.
In the step (3), after the composite molten metal pours into formwork, vacuumize, vacuum-0.1～-0.05Mpa, vacuum retention time 1～15min, the composite molten metal solidifies under vacuum environment fully.
The particle enhanced aluminum-based composite material molten metal is than the easy oxidation of alloy liquid, and the existence of particle makes the aluminum oxide film of alloy liquid surface compact become lax, and logical inert gas can prevent its oxidation; The formwork of preheating helps improving the mold-filling capacity of molten metal; Some is made up of the sealing die cavity the exocoel of formwork, because formwork has certain gas permeability, therefore the vacuum that seals in the die cavity is a dynamic balancing, and vacuum is relevant with the gas permeability of formwork.The density of magnesium base composite material is not high, adopts pour into a mould earlier the mode that afterwards vacuumizes and can avoid producing volume gas and defective such as be mingled with.
The present invention has proposed to inhale the method for watering with vacuum first and has prepared magnesium-based composite material parts; this method has solved the moulding problem of magnesium base composite material; easy oxidation when having solved the shaping of magnesium base composite material molten metal, incendive problem; simultaneously the suction casting process that adopts in this method can avoid since magnesium base composite material because of the little defective of rolling up gas easily of density; this method technology is simple; Costco Wholesale is low, is fit to the large-scale production of magnesium base composite material.The present invention equally also is fit to the preparation of magnesium alloy.
Description of drawings
The apparatus structure schematic diagram that Fig. 1 adopts for the present invention
Wherein, 1. vacuum system 2. stop valves 3. protective gas 4. protective gas 5. stop valves 6. bells 7. boss 8. dividing plates 9. formwork fixed covers 10. formworks 11. seal die cavities
The specific embodiment
Provide following examples in conjunction with content of the present invention:
Embodiment 1:
Formwork 10 usefulness formwork fixed covers 9 are fixed on the dividing plate 8 200 ℃ of formwork 10 preheat temperatures.At the logical SO in the cast gate place of formwork 10
2And CO
2Mist is protected, and shield gas flow rate 3L/min opens stop valve 2, and sealing is evacuated down to-0.05Mpa in the die cavity, and vacuum dynamic balancing retention time 2min is 5% TiB with mass percent
2pAfter/ZM5 composite pours into the formwork die cavity, be evacuated down to vacuum-0.1Mpa immediately, keep vacuum 1min, realized 5wt.%TiB
2pThe vacuum of/ZM5 composite material thin wall spare is inhaled and is watered pore-free on the foundry goods.
Embodiment 2:
Formwork 10 usefulness formwork fixed covers 9 are fixed on the dividing plate 8 400 ℃ of formwork 10 preheat temperatures.At the logical SF in the cast gate place of formwork 10
6And CO
2Mist is protected, and shield gas flow rate 30L/min opens stop valve 2, and sealing is evacuated down to-0.08Mpa in the die cavity, and vacuum dynamic balancing retention time 15min is 5% TiC with mass percent
pAfter/ZM5 composite pours into the formwork die cavity, be evacuated down to vacuum-0.05Mpa immediately, keep vacuum 3min, realized 5wt.%TiC
pThe vacuum of/ZM5 composite material thin wall complex parts is inhaled and is watered pore-free on the foundry goods.
Embodiment 3:
Formwork 10 usefulness formwork fixed covers 9 are fixed on the dividing plate 8 250 ℃ of formwork 10 preheat temperatures.At the logical SF in the cast gate place of formwork 10
6And Ar
2Mist is protected, and shield gas flow rate 50L/min opens stop valve 2, and sealing is evacuated down to-0.1Mpa in the die cavity, and vacuum dynamic balancing retention time 8min is 5% (TiB with mass percent
2After+ZM5 the based composites that TiC) mixes enhancing pours into the formwork die cavity, be evacuated down to vacuum-0.7Mpa immediately, keep vacuum 5min, realized 5wt.% (TiB
2+ TiC)/vacuum of ZM5 composite material thin wall complex parts inhales and waters pore-free on the foundry goods.
Embodiment 4:
Formwork 10 usefulness formwork fixed covers 9 are fixed on the dividing plate 8 100 ℃ of formwork 10 preheat temperatures.At the logical SO in the cast gate place of formwork 10
2And CO
2Mist is protected; shield gas flow rate 25L/min; open stop valve 2; sealing is evacuated down to-0.05Mpa in the die cavity, and vacuum dynamic balancing retention time 2min is after 5% ZM5 pours into the formwork die cavity with mass percent; be evacuated down to vacuum-0.1Mpa immediately; keep vacuum 15min, realized that pore-free on the foundry goods is watered in the vacuum suction of ZM5 alloy thin-wall complex parts.
Claims (6)
1, a kind of vacuum sucking cast process of preparing of magnesium base composite material is characterized in that, may further comprise the steps:
(1) formwork with preheating is fixed on the dividing plate with the formwork fixed cover, then the logical hybrid protection gas of formwork mouth;
(2) open the stop valve that links to each other with vacuum, sealing vacuumizes in the die cavity, reaches after the vacuum dynamic balancing and keeps vacuum;
(3) vacuum breaker, rapidly that firm refining is good magnesium base composite material melt cast is in the formwork die cavity, when being poured into formwork cast gate place, open vaccum stop valve, vacuumize, make the magnesium base composite material metal liquid, keep vacuum up to solidifying fully at vacuum retrofilling formwork die cavity.
2, the suction pouring preparation method of magnesium base composite material according to claim 1 is characterized in that, in the step (1), and formwork preheating: 100～400 ℃.
According to the suction pouring preparation method of claim 1 or 2 described magnesium base composite materials, it is characterized in that 3, in the step (1), the logical protective gas of formwork mouth is: CO
2, SO
2, Ar
2And SF
6In two or more mist, gas flow: 3L/min～50L/min.
4, the suction pouring preparation method of magnesium base composite material according to claim 1 is characterized in that, in the step (2), and vacuum retention time 1～15min, vacuum is when reaching the vacuum dynamic balancing :-0.1～-0.05Mpa.
5, the suction pouring preparation method of magnesium base composite material according to claim 1 is characterized in that, in the step (3), and described vacuumizing, vacuum is-0.1～-0.05Mpa.
6, according to the suction pouring preparation method of claim 1 or 5 described magnesium base composite materials, it is characterized in that, in the step (3), vacuum retention time 1～15min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100298844A CN1317093C (en) | 2005-09-22 | 2005-09-22 | Vacuum sucking cast process of preparing magnesium base composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100298844A CN1317093C (en) | 2005-09-22 | 2005-09-22 | Vacuum sucking cast process of preparing magnesium base composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1739888A CN1739888A (en) | 2006-03-01 |
| CN1317093C true CN1317093C (en) | 2007-05-23 |
Family
ID=36092500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100298844A Expired - Fee Related CN1317093C (en) | 2005-09-22 | 2005-09-22 | Vacuum sucking cast process of preparing magnesium base composite material |
Country Status (1)
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|---|---|
| CN (1) | CN1317093C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111230044A (en) * | 2020-03-02 | 2020-06-05 | 青田保俐铸造有限公司 | Magnesium alloy investment casting equipment and method for carrying out investment casting by adopting same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3705615A (en) * | 1970-12-09 | 1972-12-12 | Precision Metalsmiths Inc | Metal casting processes with vacuum and pressure |
| US3800851A (en) * | 1971-05-28 | 1974-04-02 | Precision Metalsmiths Inc | Metal casting apparatus with means for evacuating mold chamber and pouring chamber |
| US4726414A (en) * | 1985-06-18 | 1988-02-23 | Etude Et Developpement En Metallurgie (S.A.R.L.) | Low-pressure isostatic casting process and machine |
| JPH04367363A (en) * | 1991-06-13 | 1992-12-18 | Daido Steel Co Ltd | Method and apparatus for casting metal |
| CN2476374Y (en) * | 2001-04-05 | 2002-02-13 | 北京北方恒利科技发展有限公司 | Electromagnetic pump mold-filling type magnesium alloy low pressure casting system |
| CN1554501A (en) * | 2003-12-26 | 2004-12-15 | 周彦学 | Smelting mold casting method and its special apparatus |
-
2005
- 2005-09-22 CN CNB2005100298844A patent/CN1317093C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3705615A (en) * | 1970-12-09 | 1972-12-12 | Precision Metalsmiths Inc | Metal casting processes with vacuum and pressure |
| CA946119A (en) * | 1970-12-09 | 1974-04-30 | Precision Metalsmiths | Metal casting processes |
| US3800851A (en) * | 1971-05-28 | 1974-04-02 | Precision Metalsmiths Inc | Metal casting apparatus with means for evacuating mold chamber and pouring chamber |
| CA965923A (en) * | 1971-05-28 | 1975-04-15 | Precision Metalsmiths | Metal casting apparatus |
| US4726414A (en) * | 1985-06-18 | 1988-02-23 | Etude Et Developpement En Metallurgie (S.A.R.L.) | Low-pressure isostatic casting process and machine |
| JPH04367363A (en) * | 1991-06-13 | 1992-12-18 | Daido Steel Co Ltd | Method and apparatus for casting metal |
| CN2476374Y (en) * | 2001-04-05 | 2002-02-13 | 北京北方恒利科技发展有限公司 | Electromagnetic pump mold-filling type magnesium alloy low pressure casting system |
| CN1554501A (en) * | 2003-12-26 | 2004-12-15 | 周彦学 | Smelting mold casting method and its special apparatus |
Non-Patent Citations (2)
| Title |
|---|
| 真空铸造技术的研究现状 王新等，2004′全国真空冶金与表面工程学术研讨会会议论文集 2004 * |
| 镁合金熔模真空吸铸的研究 刘延芬等，昆明工学院学报，第19卷第4期 1994 * |
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| Publication number | Publication date |
|---|---|
| CN1739888A (en) | 2006-03-01 |
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Granted publication date: 20070523 Termination date: 20091022 |