CN102059334A - Method for directly casting and molding magnesium base composite material through flow deformation - Google Patents
Method for directly casting and molding magnesium base composite material through flow deformation Download PDFInfo
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- CN102059334A CN102059334A CN 201110002910 CN201110002910A CN102059334A CN 102059334 A CN102059334 A CN 102059334A CN 201110002910 CN201110002910 CN 201110002910 CN 201110002910 A CN201110002910 A CN 201110002910A CN 102059334 A CN102059334 A CN 102059334A
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Abstract
The invention discloses a method for directly casting and molding a magnesium base composite material through flow deformation, which comprises the step of: directly and automatically conveying the prepared semi-solid magnesium base composite material to a pressure chamber of a die casting machine. The characteristic parameters of the magnesium base composite material are as follows: the semi-solid solid phase fraction is 41 percent, the injection pressure is 40MPa, the injection speed of a punch head is 2.5m/s, and the preheating temperature of a die is 200 DEG C. The invention has the advantages of simple process, safety and reliability, and no three water pollution; and the produced semi-solid casting has spherical fine texture and greatly reduced blow holes.
Description
Technical field
The present invention relates to the direct rheo-diecasting forming method of a kind of magnesium base composite material.
Background technology
Magnesium and magnesium alloy have specific strength, specific stiffness height, vibration damping, electromagnetic shielding and capability of resistance to radiation are strong, easy machining, series of advantages such as easy recovery, have extremely important using value and wide prospect at automobile, electronics, electrical equipment, traffic, Aero-Space and national defense and military industrial circle, be the 3rd metalloid structural material that after iron and steel and aluminium alloy, grows up, and be referred to as the green engineering material of 21 century.But the comprehensive mechanical property of magnesium alloy is lower, has restricted its extensive use.
Composite provides good approach for solving this defective.Magnesium base composite material has but reduced plasticity when improving intensity, hardness, be unfavorable for the secondary plastic working to composite.Magnesium base composite material has but reduced plasticity when improving intensity, hardness, be unfavorable for the secondary plastic working to composite.
Semi-solid-state shaping divides two kinds of thixotropic forming and rheological moldings.Thixotropic forming is that the non-dendritic structure ingot blank that will prepare reheats solid-liquid two-phase region, the method that forms again.Because the cost height of non-dendritic structure ingot blank and remelting processing, and molten metal runs off easily in the reflow process, has limited being extensive use of of thixotropic forming.
Rheological molding is the method that the semi-solid metal slurry that will prepare directly forms.Compare with thixotropic forming, rheological molding get sharpest edges be more energy savings, technological process is shorter, equipment is simpler, production cost is lower.Therefore, rheological molding is the important development direction of following semi-solid-state shaping.
Summary of the invention
The purpose of this invention is to provide the direct rheo-diecasting forming method of a kind of magnesium base composite material, this method technology is simple, safe and reliable, the semisolid die casting of production, and it is spherical that microstructure is, and bleb significantly reduces.
The present invention is achieved like this, method is: the direct automatic transport of semisolid magnesium base composite material that makes is pressed the chamber to die casting machine, and parameter is: semisolid fraction solid 41%, injection ratio pressure 40MPa, drift injection speed 2.5m/s, 200 ℃ of casting formings of mold preheating temperature.
Good effect of the present invention is: the semisolid die casting of production, and it is spherical that microstructure is, and bleb significantly reduces, and technology is simple, safe and reliable, three-waste free pollution.
Description of drawings
Fig. 1 is the liquid die casting of the present invention.
Fig. 2 is a semi-solid rheological molding foundry goods of the present invention.
Fig. 3 is the microscopic structure of foundry goods under the liquid molding condition of the present invention.
Fig. 4 is the microscopic structure of foundry goods under the semi-solid-state shaping condition of the present invention.
The specific embodiment
Embodiment 1: magnesium alloy melted fully, and covers fire retardant, liquid magnesium alloy is added die casting machine press in the chamber with fire-retardant, and at injection ratio pressure 40MPa, casting forming when drift injection speed 2.5m/s, 200 ℃ of mold preheating temperatures.
Embodiment 2: magnesium base composite material is melted fully, and cover fire retardant with fire-retardant, adopt mechanical agitation to prepare the semisolid magnesium base composite material, be to press the chamber from the direct automatic transport of resistance furnace delivery outlet to die casting machine at 41% o'clock with the semisolid magnesium base composite material that makes at fraction solid then, at injection ratio pressure 40MPa, casting forming when drift injection speed 2.5m/s, 200 ℃ of mold preheating temperatures.
Combine in order to test with actual production, we have opened discharging opening at furnace bottom, so that be connected with die casting machine, thereby the semi solid slurry of preparation directly can be carried out the semi-solid rheological die cast.The discharging opening part can heat equally, thereby has avoided being unfavorable for owing to the reduction of temperature the defective of moulding.
Fig. 1 is liquid die casting, the visible fraction shrinkage cavity in positive middle part of liquid die casting and one section continuous crackle, and the solidification shrinkage defective is obviously distributing at the die casting edge.Fig. 2 is the semi-solid rheological molding foundry goods.Found out that by figure piece surface is smooth, forming quality is better.
Fig. 3 is the microscopic structure of foundry goods under the liquid molding condition, and during liquid the shaping, its microstructure is a dendritic crystalline, and has hole to occur in the microstructure.And during semi-solid-state shaping, its microstructure is that (class) is spherical, does not also occur hole defect in the microstructure, and Fig. 4 is the microscopic structure of foundry goods under the semi-solid-state shaping condition, and this can improve the service life of foundry goods effectively.
In a word, by the magnesium-base composite material semi-solid state rheo-diecasting spare that method of the present invention obtains, it is spherical that microstructure is, and bleb significantly reduces, and mechanical property is superior, and technology is simple, safe and reliable, three-waste free pollution.
Claims (1)
1. direct rheo-diecasting forming method of magnesium base composite material, it is characterized in that method is: the direct automatic transport of semisolid magnesium base composite material to the die casting machine that makes is pressed the chamber, parameter is: semisolid fraction solid 41%, injection ratio pressure 40MPa, drift injection speed 2.5m/s, 200 ℃ of mold preheating temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110002910 CN102059334A (en) | 2011-01-07 | 2011-01-07 | Method for directly casting and molding magnesium base composite material through flow deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110002910 CN102059334A (en) | 2011-01-07 | 2011-01-07 | Method for directly casting and molding magnesium base composite material through flow deformation |
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| Publication Number | Publication Date |
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| CN102059334A true CN102059334A (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110002910 Pending CN102059334A (en) | 2011-01-07 | 2011-01-07 | Method for directly casting and molding magnesium base composite material through flow deformation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190894A (en) * | 2014-08-06 | 2014-12-10 | 南昌大学 | Rheological model building method based on ultrasonic prepared semisolid Al2Y particle-reinforced Mg-Al-Zn composite material |
| CN106424631A (en) * | 2016-08-31 | 2017-02-22 | 天津圣金特汽车配件有限公司 | Magnesium alloy automobile part semi-solid die casting forming process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101069920A (en) * | 2007-06-18 | 2007-11-14 | 北京科技大学 | Process for making SiC particle reinforced composite material electronic package shell using semi-soild-state technology |
| CN101514409A (en) * | 2009-03-31 | 2009-08-26 | 南昌大学 | A method for preparing in situ MgSi particle reinforced metal matrix composite |
-
2011
- 2011-01-07 CN CN 201110002910 patent/CN102059334A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101069920A (en) * | 2007-06-18 | 2007-11-14 | 北京科技大学 | Process for making SiC particle reinforced composite material electronic package shell using semi-soild-state technology |
| CN101514409A (en) * | 2009-03-31 | 2009-08-26 | 南昌大学 | A method for preparing in situ MgSi particle reinforced metal matrix composite |
Non-Patent Citations (2)
| Title |
|---|
| 《中国有色金属学报》 20100731 胡勇等 镁基复合材料半固态压铸过程的数值模拟 1260-1266 1 第20卷, 第7期 2 * |
| 《铸造》 20101031 黄昕等 镁基复合材料流变压铸数值模拟 1053-1056 1 第59卷, 第10期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190894A (en) * | 2014-08-06 | 2014-12-10 | 南昌大学 | Rheological model building method based on ultrasonic prepared semisolid Al2Y particle-reinforced Mg-Al-Zn composite material |
| CN106424631A (en) * | 2016-08-31 | 2017-02-22 | 天津圣金特汽车配件有限公司 | Magnesium alloy automobile part semi-solid die casting forming process |
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Application publication date: 20110518 |