CN102139337A - Dual-controlled composite forming method for casting and forging of magnesium alloy - Google Patents
Dual-controlled composite forming method for casting and forging of magnesium alloy Download PDFInfo
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- CN102139337A CN102139337A CN 201110042706 CN201110042706A CN102139337A CN 102139337 A CN102139337 A CN 102139337A CN 201110042706 CN201110042706 CN 201110042706 CN 201110042706 A CN201110042706 A CN 201110042706A CN 102139337 A CN102139337 A CN 102139337A
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Abstract
The invention relates to a dual-controlled composite forming method for the casting and forging of magnesium alloy, which is suitable for improving the plastic deformation capacity of the magnesium alloy, and can meet the requirement of producing a high-performance magnesium alloy product of a relatively complex shape. The method comprises the following steps of: preparing magnesium alloy pulp with a non-dendritic microstructure through a semi-solid mixing and casting method; casting the magnesium alloy pulp in a forming mould through a semi-solid rheocasting method, wherein a cast obtained after the cooling and solidification serves as a semi-formed part; heating the cast to 2-10 DEG C above the solidus temperature in a forging and forming mould; and die forging and forming the cast to obtain a magnesium alloy part. The method can be used for producing magnesium alloy parts of complex shapes, and produced parts have the advantages of excellent mechanical properties, high dimensional accuracy and strong deformation capacity.
Description
Technical field
The present invention relates to a kind of casting of magnesium alloy and forge two control combined shaping methods.The present invention can be used for preparing the magnesium alloy parts that shape is complicated, performance requirement is high, and this method forming property is good, prepared good product performance, the advantage that dimensional accuracy is high.
Background technology
Magnesium alloy has light weight, easily reclaims, excellent properties such as heat-conductivity conducting is good, damping vibration attenuation, electromagnetic shielding, has broad application prospects in fields such as traffic, communication, electrical equipment and Aero-Space.But magnesium alloy has the characteristics of hexagonal crystallographic texture, and independently slip system is few under the deformation at room temperature condition, and temperature-room type plasticity is low, the deformation processing difficulty.Although raising processing temperature, magnesium alloy can use extruding, method such as rolling to process, complicated process of preparation, production cost are higher relatively, and are difficult to satisfy the demand of preparation complex parts.In addition, the mechanical property of the magnesium alloy product of utilization casting preparation is not ideal enough.Therefore, magnesium alloy Plastic Forming poor performance has become the bottleneck problem that hinders the high-performance magnesium-alloy large-scale application.
Coarse-grain superplasticforming technology (Qiao Jun et al., Superplasticity-like creep behavior of coarse grained ternary Al alloys, Transactions of Nonferrous Metals Society of China, 2010,20,564-571.) be meant that coarse-grain alloy (referring generally to crystallite dimension＞50 μ m) obtains to surpass the phenomenon of 200% percentage elongation under certain deformation temperature and rate of deformation.Magnesium alloy coarse-grain superplastic deformation has higher plastic deformation ability, and can obtain fine grained texture by the deformation process dynamic recrystallization, but strain rate is slower, generally is lower than 1 * 10
-3s
-1, be difficult to satisfy the demand of industrial applications.
Semisolid forming technique (Wang Kai et al., Microstructural characteristics of near-liquidus cast AZ91D alloy during semi-solid die casting, Transactions of Nonferrous Metals Society of China, 2010,20,171-177) be a kind of brand-new forming technique that liquid condition shaping technology and formed solid technical development get up that continues.Semi-solid processing is that promptly semi solid slurry is made of liquid phase and non-dendrite solid phase, shows good thixotroping (solid rate is higher than 50%) or rheological property (solid rate is lower than 50%) in the distortion of alloy solid-liquid temperature range, and forming property is good.But, existing preparation method of semisolid state slurry thereof, as (Jiang Yunxi etc., semi-solid metal slurry new preparation technology, forging technologies such as mechanical agitation, electromagnetic agitation, deformation induced methods, 2003,6,41-47) all be difficult to obtain tiny non-dendrite solid phase, and can not continue crystal grain thinning by semi-solid-state shaping, therefore, be difficult to further improve the product serviceability.
Based on this, press for the new Mg alloy formed technology of exploitation, prepare high performance magnesium alloy product, expansion Application of Magnesium field.
Summary of the invention
Purpose of the present invention is to improve the plastic deformation ability of magnesium alloy, preparation high-performance magnesium-alloy part.The get everything ready Mg alloy castings blank of non-dendrite microstructure of utilization semi-solid casting legal system is proposed, then at this more than alloy solidus temperature, when a small amount of liquid phase is separated out, spray is forged, by the Plastic Forming of a small amount of liquid phase coordination coarse-grain magnesium alloy, provide a kind of casting of magnesium alloy to forge two control combined shaping methods.
Realize that step of the present invention is:
1. in resistance furnace, melt magnesium alloy, carry out degasification, slagging-off and refining treatment; 2. the magnesium alloy fused mass temperature is reduced to solid-liquid two-phase temperature range, stir and make semi solid slurry; 3. use the semi-solid rheological casting method that semi solid slurry is poured in the shaping dies, obtain foundry goods after the cooled and solidified; 4. heat foundry goods to inserting more than the solidus temperature in the forging and molding mould; 5. in shaping dies, carry out forging and molding, make magnesium alloy parts.
Beneficial effect of the present invention is:
1. it is good that preparation method of the present invention has the material forming performance, can prepare complex-shaped magnesium alloy parts.
2. prepared product quality height, the dimensional accuracy height of the present invention.
Description of drawings
Fig. 1 is the flow chart that casting of magnesium alloy is forged two control combined shaping methods.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Referring to Fig. 1.The step that a kind of casting of magnesium alloy of the present invention is forged two control combined shaping methods is as follows:
1. use resistance furnace fusing magnesium alloy, and carry out degasification, slagging-off and refining treatment;
2. the alloy melt temperature is reduced to solid-liquid two-phase temperature range, after stirring, cast form in shaping dies, the foundry goods of acquisition is as the die-forging forming blank;
3. heat foundry goods to the above 2-10 of solidus temperature ℃, insert in the forging and molding mould;
4. in shaping dies, carry out forging and molding, obtain magnesium alloy product.
Embodiment 1
Use resistance-heated furnace melting ZK60 magnesium alloy, after it is carried out degasification, slagging-off and handles, be cooled to 580 ℃, whole fusion process is at N
2+ 6%SF
6Carry out under the protective atmosphere; Then, melt is carried out electromagnetic agitation, the Temperature Distribution of even melt, broken dendrite; Cooled and solidified in shaping dies makes foundry goods, as the forging and molding blank; Foundry goods is heated to above 5-10 ℃ of ZK60 magnesium alloy solidus temperature (the ZK60 solidus temperature is 426 ℃) insulation 5 minutes, places the forging and molding mould; With 1s-1 rate of deformation forging and molding.
Embodiment 2
Use resistance melting furnace melting AZ31 magnesium alloy, after it is carried out degasification, slagging-off and handles, be cooled to 580 ℃, whole fusion process cloth N
2+ 6%SF
6Carry out under the protective atmosphere; Then, melt is carried out mechanical agitation, the Temperature Distribution of even melt, broken dendrite; Cooled and solidified in shaping dies makes foundry goods, and this foundry goods is as rough forging; The heating foundry goods places the forging and molding mould to above 2-5 ℃ of AZ31 magnesium alloy solidus temperature (AZ31 magnesium alloy solidus temperature is 566 ℃) insulation 5 minutes; With 10s
-1The rate of deformation forging and molding.
By change magnesium alloy type, all can use casting to forge two control combined shaping methods and prepare shape comparatively complexity, the excellent magnesium alloy product of performance among the present invention.
Need to prove at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (1)
1. a casting of magnesium alloy is forged two control combined shaping methods, it is characterized in that following steps are arranged:
1. use resistance furnace fusing magnesium alloy, and carry out degasification, slagging-off and refining treatment;
2. the alloy melt temperature is reduced to solid-liquid two-phase temperature range, stir and make semi solid slurry;
3. use the semi-solid rheological casting method that semi solid slurry is poured in the shaping dies, obtain foundry goods after the cooled and solidified, as the half form part;
4. heat foundry goods to the above 2-10 of solidus temperature ℃, insert in the forging and molding mould;
5. in shaping dies, carry out forging and molding, make magnesium alloy parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110042706 CN102139337A (en) | 2011-02-22 | 2011-02-22 | Dual-controlled composite forming method for casting and forging of magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110042706 CN102139337A (en) | 2011-02-22 | 2011-02-22 | Dual-controlled composite forming method for casting and forging of magnesium alloy |
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| CN102139337A true CN102139337A (en) | 2011-08-03 |
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| CN 201110042706 Pending CN102139337A (en) | 2011-02-22 | 2011-02-22 | Dual-controlled composite forming method for casting and forging of magnesium alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102286710A (en) * | 2011-09-08 | 2011-12-21 | 重庆大学 | Method for preparing alloy semi-solid forming plate blanks by casting and rolling dual control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1011897B1 (en) * | 1997-01-31 | 2003-09-17 | Amcan Castings Limited | Semi-solid metal forming process |
| JP3467824B2 (en) * | 1993-02-19 | 2003-11-17 | マツダ株式会社 | Manufacturing method of magnesium alloy member |
| CN1613576A (en) * | 2004-09-29 | 2005-05-11 | 哈尔滨工业大学 | Metal semi-solid double controlled shaping method |
| CN101210295A (en) * | 2006-12-26 | 2008-07-02 | 北京有色金属研究总院 | Method for processing magnesium alloy |
| CN101367124A (en) * | 2008-07-31 | 2009-02-18 | 镁联科技（芜湖）有限公司 | Method of manufacturing magnesium alloy semi-solid state blank |
| CN101934336A (en) * | 2010-09-14 | 2011-01-05 | 华中科技大学 | Method and device for semi-solid precision rheo-casting of light alloys |
-
2011
- 2011-02-22 CN CN 201110042706 patent/CN102139337A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3467824B2 (en) * | 1993-02-19 | 2003-11-17 | マツダ株式会社 | Manufacturing method of magnesium alloy member |
| EP1011897B1 (en) * | 1997-01-31 | 2003-09-17 | Amcan Castings Limited | Semi-solid metal forming process |
| CN1613576A (en) * | 2004-09-29 | 2005-05-11 | 哈尔滨工业大学 | Metal semi-solid double controlled shaping method |
| CN101210295A (en) * | 2006-12-26 | 2008-07-02 | 北京有色金属研究总院 | Method for processing magnesium alloy |
| CN101367124A (en) * | 2008-07-31 | 2009-02-18 | 镁联科技（芜湖）有限公司 | Method of manufacturing magnesium alloy semi-solid state blank |
| CN101934336A (en) * | 2010-09-14 | 2011-01-05 | 华中科技大学 | Method and device for semi-solid precision rheo-casting of light alloys |
Non-Patent Citations (1)
| Title |
|---|
| 《材料与冶金学报》 20020331 任栖锋等 半固态加工技术的进展及我国应对措施 第16页 1 第1卷, 第1期 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102286710A (en) * | 2011-09-08 | 2011-12-21 | 重庆大学 | Method for preparing alloy semi-solid forming plate blanks by casting and rolling dual control method |
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Application publication date: 20110803 |