CN106513622A - AM50 magnesium alloy vacuum die-casting process - Google Patents
AM50 magnesium alloy vacuum die-casting process Download PDFInfo
- Publication number
- CN106513622A CN106513622A CN201610988927.XA CN201610988927A CN106513622A CN 106513622 A CN106513622 A CN 106513622A CN 201610988927 A CN201610988927 A CN 201610988927A CN 106513622 A CN106513622 A CN 106513622A
- Authority
- CN
- China
- Prior art keywords
- casting process
- mould
- die casting
- vacuum
- vacuum die
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
Abstract
The invention discloses an AM50 magnesium alloy vacuum die-casting process. The process controls the pouring temperature of 678-683 DEG C, the mold temperature of 188-193 DEG C, the punch low-speed speed of 0.2 m/s and the high-speed injection speed of 6 m/s, so that a casting reaches the yield strength of 140-145 MPa, the tensile strength of 220-225 MPa and the elongation of 3.4-3.7%.
Description
Technical field
The present invention relates to die-casting technique field, more particularly to a kind of extrusion process of magnesium alloy, more particularly to a kind of AM50
The vacuum die casting process of magnesium alloy.
Background technology
From U.S.'s Dow Chemical Company in 1916 successfully by used for magnesium alloy in die casting, magnesium alloy pressure-casting technology is so far
Existing 100 years history.Magnesium alloy is increasingly widely applied in fields such as automobile, electronics, especially recently as
The extensive application of the electronic products such as mobile phone, its purposes and specification it is more and more.Magnesium alloy has high specific strength and than elastic modelling quantity,
Good rigid, damping property, machinability and anti-electromagnetic interference shielding, it is easy to secondary use, and have do not corrode ferrum and
Steel, not with its alloying, die casting service life can be extended the advantages of, become automobile, the important component part of mobile phone material.
AM50 magnesium alloy compositions (mass fraction) is：5.05%Al,<0.2 0%Zn, 0.23%Mn, 0.041%Si,
0.0030%Fe, 0.0024%Cu,<0.001%Ni, Mg surplus.There is under AM50 magnesium alloy room temperatures good plasticity and have
The conventional diecast magnesium alloy of some strength and excellent corrosion resistance.Appropriate technique ginseng is chosen on the basis of aluminium alloy quality is ensured
Number is the key for obtaining excellent mechanical performances die casting.
The content of the invention
It is an object of the invention to propose a kind of vacuum die casting process of AM50 magnesium alloys, the technique causes the AM50 magnesium
Alloy obtains excellent mechanical performances.
It is that, up to this purpose, the present invention is employed the following technical solutions：
A kind of vacuum die casting process of AM50 magnesium alloys, including：
(1) brush releasing agent on mould；
(2) mould assembly；
(3) liquid AM50 magnesium alloy molten metal, injection molten metal pressurize solidification are poured into；
(4) push back and cool down with foundry goods；
(5) open form, ejection foundry goods.
Technique of the present invention must adopt evacuated die-casting process, the vacuum to be not more than 30kPa.
Conventional die casting needs to fill type at high speeds, and the portion gas in pressure chamber and die cavity are difficult to by steam vent and overflow launder
Discharge, therefore the as cast condition defect containing substantial amounts of stratiform hole shape in die casting.In order to reduce the content of gas, the present invention is adopted
The air of die-casting die intracavity is extracted out by vacuum die casting process using auxiliary equipment, under vacuum conditions by molten metal casting forming,
The pore of inside die-casting part can be eliminated or be reduced, the mechanical property and surface quality of die casting is improved.
Compared to conventional die casting, the evacuated die-casting process of the present invention need to increase a vacuum valve on mould structure.Vacuum valve
Position be arranged on cover half wallboard, by evacuated die-casting process system vacuum pump produce negative pressure, instantaneously take mould template die cavity away
And the gas of pipeline, and the closing passage on schedule when molten metal fills type, prevent molten metal from entering vacuum pipe, make metal
Liquation die cast in the state of vacuum.
Releasing agent described in step 1 of the present invention, can be any releasing agent known in the art.Typical but non-limit of the invention
Deltacast 333 type releasing agent of the releasing agent of property processed using the manufacture of Acheson companies.
In press casting procedure, liquid metal is passed to the heat of mould and will be spread out of by convection current, radiation and heat exchange pattern.In pressure
During casting, die-casting technological parameter such as pouring temperature and mold temperature can have influence on the Shrinkage cavity of inside die-casting part.
Therefore, in the present invention, step 3 is the committed step for affecting AM50 magnesium alloy mechanical properties, its technological parameter
Select, be the inventive point of the present invention.In step 3, pouring temperature is 678-683 DEG C, and mold temperature is 188-193 DEG C, drift
In 0.2m/s, high speed injection speed is 6m/s to low speed speed controlling.
Most of casting flaw results from process of setting, and the real behavior and rule for disclosing metal freezing is that foundry goods was formed
The purpose and content of journey theoretical research.The liquidus temperature of AM50 magnesium alloys is 628 DEG C, and solidus temperature is 546 DEG C.Foundry goods exists
Early solidification, produces the irregular hole of the pole of figure as molten metal feeding is not enough, and hole wall is coarse and carries Dendritic TiC.In casting
Easily there is isolated molten bath area in the boundary position of the cascaded surface of part.These isolated molten bath areas in solidification shrinkage, by two ends
The obstruction of frozen metal, can produce casting stress concentration, so as to form casting crack.Isolated molten bath area is bigger, and melt more collects
In, easier generation shrinkage cavity defect.Here it is foundry goods produce shrinkage cavity fundamental cause, and alloy from outward appearance to inner essence Layer by layer solidification when
Form the condition of concentrating shrinkage cavity.The shrinkage cavity of vacuum foundry goods occurs in the heat at the last solidification position of molten metal and metal accumulation by concentrating
At section.
Therefore, present invention set-point cooling preferably on mould, the region high for temperature cools down, to reduce cooling
Time.Preferably, described cooling settings are in isolated molten bath area.
The vacuum die casting process of the AM50 alloys of the present invention, can be used for automobile engine cylinder head, mobile phone shell, various electrical equipment
The casting of shell.
After vacuum die casting process using the present invention, the density of the AM50 Mg alloy castings can reach 1.7869-
1.7871g/cm2, meet casting density requirement and slightly larger than foundry goods least density.Foundry goods yield strength is 140-145MPa,
Tensile strength is 220-225MPa, and percentage elongation is 3.4-3.7%.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of vacuum die casting process of AM50 magnesium alloy autos cylinder cap, including：
(1) brush releasing agent on mould；
(2) mould assembly；
(3) liquid AM50 magnesium alloy molten metal, injection molten metal pressurize solidification are poured into；Pouring temperature is 680 DEG C, mould
Temperature is 190 DEG C, and in 0.2m/s, high speed injection speed is 6m/s to drift low speed speed controlling；
(4) push back and cool down with foundry goods；
(5) open form, ejection foundry goods.
After testing, foundry goods yield strength is 140MPa, and tensile strength is 220MPa, and percentage elongation is 3.7%.
Embodiment 2
A kind of vacuum die casting process of AM50 Mg alloy mobile phone covers shell, including：
(1) brush releasing agent on mould；
(2) mould assembly；
(3) liquid AM50 magnesium alloy molten metal, injection molten metal pressurize solidification are poured into；Pouring temperature is 678 DEG C, mould
Temperature is 192 DEG C, and in 0.2m/s, high speed injection speed is 6m/s to drift low speed speed controlling；
(4) push back and cool down with foundry goods；
(5) open form, ejection foundry goods.
After testing, foundry goods yield strength is 145MPa, and tensile strength is 223MPa, and percentage elongation is 3.5%.
Claims (4)
1. a kind of vacuum die casting process of AM50 magnesium alloys, including：
(1) brush releasing agent on mould；
(2) mould assembly；
(3) liquid AM50 magnesium alloy molten metal, injection molten metal pressurize solidification are poured into；Pouring temperature is 678-683 DEG C, mould
Temperature is 188-193 DEG C, and in 0.2m/s, high speed injection speed is 6m/s to drift low speed speed controlling；
(4) push back and cool down with foundry goods；
(5) open form, ejection foundry goods.
2. the vacuum die casting process of AM50 magnesium alloys as claimed in claim 1, it is characterised in that the vacuum of the evacuated die-casting process
Degree is not more than 30kPa.
3. the vacuum die casting process of AM50 magnesium alloys as claimed in claim 1 or 2, it is characterised in that the set-point on mould
Cooling, in step (4), the region high for temperature cools down, to reduce cool time.
4. the vacuum die casting process of AM50 magnesium alloys as claimed in claim 3, it is characterised in that described cooling settings are in orphan
Vertical molten bath area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610988927.XA CN106513622A (en) | 2016-11-10 | 2016-11-10 | AM50 magnesium alloy vacuum die-casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610988927.XA CN106513622A (en) | 2016-11-10 | 2016-11-10 | AM50 magnesium alloy vacuum die-casting process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106513622A true CN106513622A (en) | 2017-03-22 |
Family
ID=58350791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610988927.XA Pending CN106513622A (en) | 2016-11-10 | 2016-11-10 | AM50 magnesium alloy vacuum die-casting process |
Country Status (1)
| Country | Link |
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| CN (1) | CN106513622A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108311658A (en) * | 2018-02-08 | 2018-07-24 | 山东弗泽瑞金属科技有限公司 | Vacuum low speed pressure casting method |
| CN111344089A (en) * | 2017-09-11 | 2020-06-26 | 恩泰科-斯特拉康有限责任公司 | Wheel manufacturing method, casting mold and device |
| CN115369298A (en) * | 2022-07-28 | 2022-11-22 | 中国第一汽车股份有限公司 | Heat-treatment-free magnesium alloy damping tower and high-vacuum die casting method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1640586A (en) * | 2004-01-17 | 2005-07-20 | 镁联科技（香港）有限公司 | Metal alloy thixotropic forming process and equipment thereof |
| CN101037729A (en) * | 2007-04-24 | 2007-09-19 | 重庆硕龙科技有限公司 | Magnesium alloy furnace material fluxless remelting refining method and device |
| JP2009255149A (en) * | 2008-04-18 | 2009-11-05 | Mitsui Mining & Smelting Co Ltd | Method for manufacturing non-ferrous metal formed body |
| CN104284992A (en) * | 2012-06-26 | 2015-01-14 | 百多力股份公司 | Magnesium-zinc-calcium alloy, method for production thereof, and use thereof |
-
2016
- 2016-11-10 CN CN201610988927.XA patent/CN106513622A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1640586A (en) * | 2004-01-17 | 2005-07-20 | 镁联科技（香港）有限公司 | Metal alloy thixotropic forming process and equipment thereof |
| CN101037729A (en) * | 2007-04-24 | 2007-09-19 | 重庆硕龙科技有限公司 | Magnesium alloy furnace material fluxless remelting refining method and device |
| JP2009255149A (en) * | 2008-04-18 | 2009-11-05 | Mitsui Mining & Smelting Co Ltd | Method for manufacturing non-ferrous metal formed body |
| CN104284992A (en) * | 2012-06-26 | 2015-01-14 | 百多力股份公司 | Magnesium-zinc-calcium alloy, method for production thereof, and use thereof |
Non-Patent Citations (1)
| Title |
|---|
| 胡泊等: "真空压铸工艺参数对AM50镁合金力学性能的影响规律", 《特种铸造及有色合金》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111344089A (en) * | 2017-09-11 | 2020-06-26 | 恩泰科-斯特拉康有限责任公司 | Wheel manufacturing method, casting mold and device |
| CN108311658A (en) * | 2018-02-08 | 2018-07-24 | 山东弗泽瑞金属科技有限公司 | Vacuum low speed pressure casting method |
| CN115369298A (en) * | 2022-07-28 | 2022-11-22 | 中国第一汽车股份有限公司 | Heat-treatment-free magnesium alloy damping tower and high-vacuum die casting method and application thereof |
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Application publication date: 20170322 |
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