CN100352581C - Metal glass melt cast moulding method and its device - Google Patents
Metal glass melt cast moulding method and its device Download PDFInfo
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- CN100352581C CN100352581C CNB200510020016XA CN200510020016A CN100352581C CN 100352581 C CN100352581 C CN 100352581C CN B200510020016X A CNB200510020016X A CN B200510020016XA CN 200510020016 A CN200510020016 A CN 200510020016A CN 100352581 C CN100352581 C CN 100352581C
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Abstract
The present invention discloses a metal glass melt cast moulding method and a device for the method, wherein in the method, alloys are added to a melting furnace to be melted, and the temperature in the melting furnace is adjusted. When the temperature reaches the casting temperature, gas in a mould is extracted to ensure that 5KPa to 15KPa of negative pressure can be generated in the mould, and metal glass melt is sucked into the mould cavity of the mould to form a component part; the device of the present invention is characterized in that a crucible arranged in the melting furnace is communicated with the mould by a suction pipe, a negative pressure generator is connected with the upper end of the mould by a connection pipe on which a control valve, a pressure measuring device and a negative pressure stable device are arranged successively. Gas pressure can also be exerted on the surface of the metal glass melt in the method, and the mould filling process of the metal glass melt can be further promoted. The method has the advantages that metal glass material prepared in the method has high inherent quality and has no defects that the metal glass material has air holes, etc. The mould filling capacity is strong, parts of which the minimum wall thickness is 2MM can be manufactured, and the problems that the metal glass melt has poor fluidity and difficult mould filling are overcome. The device has the advantages of simple equipment and convenient and rapid operation.
Description
Technical field
The invention belongs to metallurgy and metal material processing technical field, be specifically related to the cast moulding method and the device thereof of a kind of glassy metal (amorphous state) melt.
Technical background
Glassy metal (block amorphous alloy) has intensity, hardness and the superior performances such as corrosion resistance of superelevation, have potential extensive use in fields such as military affairs, Aero-Space and electronics, become one of focus of in the new material high-tech sector, fighting for various countries, the world today.
Amorphous state is exactly that atom long-range on arranging is unordered, the state of shortrange order in simple terms.The main feature of amorphous alloy is the arrangement that the three dimensions of atom is the topological disorder state; It does not have crystal boundary and heap to stamp defective such as fault to exist on the structure, but also unordered fully not of the arrangement of atom resemble the perfect gas.Amorphous alloy be with metallic bond as its architectural feature, though there is not long-range order, in several lattice constant range, keep shortrange order.
The successful preparation of bulk amorphous alloy (glassy metal), in particularly pass by 10 years, because critical cooling rate is lower than 100K/s, the discovery that can prepare diameter 1cm even bigger block amorphous alloy composition has caused that people are to the research of amorphous alloy with explore extensive interest.In the last thirty years, along with the continuous progress of science, existing a large amount of non-crystaline amorphous metal system is developed, such as, Mg base, Zr base, Ti base, Fe base, Co base, Ni base, Pd-Cu base, or the like.In these non-crystaline amorphous metal systems, a lot of amorphous alloys have excellent characteristic.Because the restriction of process conditions, before the nineties, so amorphous alloy almost all prepares by single roller strip technology, this thickness is about the strip of tens micron dimensions obviously can't be used in many practical project, and such size condition has seriously limited amorphous alloy and used widely.
Except the metallic glass alloys composition Design, the preparation method is bringing into play crucial effects in the preparation of amorphous alloy.At present large block amorphous mainly is by direct freezing method preparation, mainly contains following certain methods:
(1) metal mold gravity casting
Metal mold gravity casting is that liquid metal is directly poured in the metal mold under protective atmosphere usually, utilizes fast realization of metal mold heat conduction to cool off fast to obtain glassy metal.This method technical process is fairly simple, also easy operating, but because the cooling rate of metal mold is limited, the size of the glassy metal that can prepare also limited.Metal mold can be that two kinds of water-cooled and no water-cooleds are arranged, and the purpose of water-cooled mainly is in order to guarantee during alloy melting, and mould is not heated by crucible and keeps minimum temperature as far as possible.If there is not water-cooled, along with the prolongation of time, the temperature of alloy approaches the temperature of copper type, and has the temperature of the copper type of water-cooled to hang down, and does not have the temperature of water-cooled higher, and the water-cooled copper type will have fast slightly cooling velocity in following period of time after a while.The shape of die cavity then can be wedge shape, stairstepping, cylindrical or sheet etc. as required; The volume of metal mold should be enough big, to guarantee providing enough heat sink in of short duration melt filling time.But do not have the effect of external force when this method is filled type, fill the shortcoming of type difficulty when thin-walled is arranged.
(2) low pressure casting
Be that traditional copper mold blows casting.Low pressure casting is exactly behind alloy melting in the quartz ampoule in simple terms, by the inert gas pressurization, alloy is injected the method that mold cools down is shaped in the pipe upper end.(Inoue, A.Kato, the A such as Inoue of northeastern Japan university in 1991, Zhang, T, Mg-Cu-Y amorphousalloys with high mechanical strengths produced by a metallic moldcasting method, Materials Transactions, JIM, v 32, and n 7, Jul, 1991, p 609-616) pass through low pressure casting---it is the Mg of 4mm that the cooling of jet shaping/copper mold has prepared diameter
65Cu
25Y
10The amorphous bar, adopt Mg with the quadrat method preparation
80Cu
10Y
10Non-crystaline amorphous metal is at room temperature tested the σ that records
pBe 822Mpa, and along with the rising of temperature σ when the 350K
pThere is not obvious variation.This also is people have prepared the mm level for the first time by the conventional cast method a glassy metal.But the shortcoming of this method is that the molten metal amount is limited in the common quartz ampoule, is difficult to prepare long or bigger part.
(3) high-pressure casting
Hpdc equipment is mainly formed (Inoue A by the cylinder sleeve and the piston of master alloy melting, the hydraulic press that applies high pressure, high voltage bearing casting copper type, the extract system etc. that can remove gas in crucible and the copper type before cast rapidly, Nakamura T, et al.Mg-Cu-Y bulk amorphous alloyswith high tensile strength produced by a high-pressure die castingmethod.MaterTrans JIM, 1992,33 (10): 937).Cylinder sleeve and piston are made by Thermal-resistance tool steel (SKD61).Under the argon atmospher protection, foundry alloy melting in having the cylinder sleeve of radio-frequency induction coil by the water pressure pushing piston, is pushed into melt metal in the copper type fast.This equipment has following characteristics: 1. melt charges into casting mold fully within a few m s, and this will cause higher cooldown rate and tangible more quenching effect; 2. high pressure will cause melt to contact more closely with casting mold, thereby make the C-factor increase between melt and the casting mold and quicken spreading out of of hot-fluid, thereby improve cooldown rate; 3. casting flaw such as loose will reduce because solidification shrinkage causes; Even 4. for the melt of high viscosity, also can be gone out the foundry goods of complicated shape by the liquid direct forming, this should be a kind of good method of the nearly clean shape glassy metal of preparation.But the easiest formation gas hole defect of die casting, actual detection confirms, the size that all distributing equably on the whole section of sample from heart portion to the surface is the pore of 5～40 μ m, estimates that the porosity reaches 17%, and irrelevant with the cooling rate of sample in other words with the diameter of sample.
(4) extrusion casint
Extrusion casint is exactly earlier magnesium base alloy to be put into the crucible melting, utilizes the hydraulic pressure rising pouring that melt is pressed into mold cavity then; After treating that melt fills up die cavity fully, pressurization and maintenance certain hour solidify fully up to metal in airtight casting mold.In the extrusion casint process, the effect of high pressure makes in the whole freezing period and more closely contacts between the liquid metal and mould type wall, thereby can strengthen the heat transfer of alloy and mould, and the while application of pressure can also be avoided casting flaws such as pore and contraction effectively.2000, Kang, (Kang H G, Park E S, et al.Fabrication of bulkMg-Cu-Ag-Y glassy alloy by squeeze casting.Mater Trans JIM, 2000,41 (7): such as Hyung Gu 846) at Mg
65Cu
25Ag
10Partly substituting Cu with Y on the basis utilizes the method for extrusion casint to prepare the Mg that d max reaches 10mm
65Cu
15Y
10Ag
10Glassy metal, simultaneously the author has also prepared the Mg that diameter reaches 6mm with the method for injection moulding
65Cu
15Y
10Ag
10Glassy metal.The weak point of this method is the requirement height to equipment, and equipment investment is big.
Large block amorphous have an outstanding performance, can both be applied in a lot of fields.But the sample of current preparation bulk amorphous alloys mostly is pole or thin plate, also needs follow-up process just can become part, but amorphous processing all has complex process and the high characteristics of cost.Even more serious is, if technology controlling and process is not tight, is easy to make amorphous thin plate generation crystallization, thereby makes the amorphous part scrap.The situation of subsequent machining technology is what be difficult to change, unique feasible be exactly the operation of managing to save processing.This has just proposed the disposable shaping problem of amorphous product.How to develop new technology and new equipment and the disposable amorphous product of directly producing, break through this difficult problem and have great importance for commercialization, the industrialization of block amorphous alloy.
In sum, the manufacturing process of block metal glass is to have adopted traditional manufacturing process in order to prepare sample mostly in the world at present, owing to need forming speed fast mostly, by blowing the method for casting or high speed die casting, the sample of preparation is easy to generate defectives such as pore.Therefore, it is strong and fill the high manufacturing process of type quality to press for the new mold-filling capacity of exploitation.
Summary of the invention
The object of the present invention is to provide a kind of cast moulding method of metal glass melt, this method can reach the purpose that direct forming goes out the glassy metal part, obtains the inner imperforate high-quality material of part, realizes that clean end form is shaped.
The cast moulding method of a kind of metal glass melt provided by the invention the steps include:
(1) chemical composition according to glassy metal requires alloyage, and alloy is added the melting furnace fusing;
(2) regulate the temperature of metal glass melt to the pouring temperature that requires;
(3) when the temperature of metal glass melt arrives pouring temperature, extract the gas in the mould, making it produce vacuum degree is the negative pressure of 5kPa～15kPa, and the metal glass melt in the attraction melting furnace in the crucible enters in the mold cavity, is configured as part.
As the improvement of the inventive method, in extracting mould, step (3) during gas, in the crucible of melting furnace, feeds protective gas, and this gas pressure is 10kPa～20kPa.
Realize the device of said method, its structure is: the crucible of with closure is positioned at melting furnace, communicate by suction tube between crucible and the mould, negative pressure generator links to each other with the upper end of mould by connecting pipe, and control valve, device for pressure measurement and negative regulation device are installed on the connecting pipe of mould and negative pressure generator successively.
As the improvement of apparatus of the present invention, an end of protective gas pipeline links to each other with crucible, and the other end links to each other with the protection source of the gas, and its tube connector is provided with flow pressure adjuster and control valve.
Because traditional copper mold blows casting and melts in quartz ampoule, the fusing amount is very little, can only prepare very little sample.After adopting method of the present invention, can utilize bigger crucible, can once melt the metal of more amount, can prepare bigger part, also can attract castable repeatedly, improve production efficiency greatly.The stowage capacity of the inventive method is fine, do not having under the situation of differential pressure, and promptly only be vacuum suction castable method, the part minimum wall thickness (MINI W.) of having realized is 2mm.Under the situation of auxiliary differential pressure, the part wall thickness of filling can be littler.Device of the present invention has been realized the negative pressure and the differential pressure cavity filling process of metal glass melt, and the wall thickness that can be shaped is from the thick glassy metal part of 1mm～50mm, and the pressure adjustable range is big, and vacuum degree (vacuum) can reach 5kPa; The malleation of gas can reach 20kPa.This device is simple to operate, and control is convenient.
Description of drawings
Fig. 1 is the structural representation of the cast form device of metal glass melt;
Fig. 2 is the Mg-Cu-Y glassy metal rod of the diameter 3mm of vacuum suction castable;
Fig. 3 is Mg
65Cu
25Y
10The optical microscope photograph of glassy metal.
The specific embodiment
The inventive method also is referred to as vacuum suction castable method, and its technical process is:
(1) chemical composition according to glassy metal requires alloyage, and alloy is added the melting furnace fusing.The inventive method is applicable to the glassy metal of the existing various chemical compositions of preparation, comprises magnesium-base metal glass, aluminium based metal glass and iron based metallic glass etc., as Mg-Cu-Y, Al-Ni-Y-Co or Fe-Ga-B etc.When the glassy metal of the easy oxidation of preparation, feed protective gas (as inert gases such as nitrogen or argon gas) protection in the crucible when reinforced in melting furnace, to prevent its oxidation.
(2) regulate the temperature of metal glass melt to the pouring temperature that requires.Temperature is too high, then causes cooling velocity to reduce after the cast, is difficult to form bulk amorphous material; Temperature is crossed when hanging down and can be existed melt to fill the problem of type difficulty again.
(3) when the temperature of metal glass melt arrives pouring temperature, extract the gas in the mould, make it produce negative pressure, the magnitude range of vacuum degree (vacuum) is: 5kPa～15kPa, attract the metal glass melt in the interior crucible of melting furnace to enter in the mold cavity, be configured as part.
For further improving the mold-filling capacity of metal glass melt; make its can the filling thin-walled, complicated die cavity; can be when extracting gases produces negative pressure; in the crucible of melting furnace, feed protective gas; apply gas pressure to its metal glass melt liquid level, this gas pressure is 10kPa～20kPa.When the glassy metal of the easy oxidation of preparation, only need when being shaped, the protective gas pressure that feeds to be adjusted to 10kPa～20kPa and get final product.This method also is referred to as negative pressure-differential pressure forming process.
The device of realizing said method as shown in Figure 1, it comprises crucible 2, mould 3, control valve 6, device for pressure measurement 7, negative regulation device 8 and the negative pressure generator 5 of melting furnace 1, with closure.Communicate by suction tube 4 between crucible 2 and the mould 3, negative pressure generator 5 links to each other by the upper end of connecting pipe with mould 3, on the tube connector of mould 3 and negative pressure generator 5 control valve 6, device for pressure measurement 7 and negative regulation device 8 is installed successively.Connection between each parts should keep good air-tightness.
Negative pressure generator produces negative pressure, vacuumizes to make negative regulation device 8 produce certain vacuum between the preparatory stage before the cast.During the cast beginning, opening controlling valve 6, negative pressure generator 5 to mould 3 extracting vacuum, produce negative pressure by connecting pipe, to the metal glass melt generation sucking action that is positioned at melting furnace of bottom.Metal glass melt rises by suction tube 4 and enters in the mould 3 the filling die cavity.When the die cavity filling is finished, close negative pressure generator 5 and control valve 6, stop the vacuum suction function.After treating that temperature reduces, open mould, can take out be shaped good part or sample.
Cause filling type very during situation of difficult thereby very complicated or wall is very thin when part shape; said apparatus and protective gas device are united use; can realize that negative pressure-counter-pressure casting is shaped: promptly on the basis that above-mentioned negative pressure is shaped; surface by the metal glass melt of protective gas device in crucible when cast applies the gas malleation; with metal glass melt to pressing down; promote that metal glass melt enters mould 3 by suction tube 4; auxiliary negative pressure cavity filling process promptly constitutes so-called negative pressure-differential pressure and is shaped.
The structure of protective gas device is: an end of protective gas pipeline 9 links to each other with the crucible 2 of with closure, and its other end links to each other with protection source of the gas 12, and its tube connector is provided with flow pressure adjuster 10 and control valve 11.This protective gas device both can be used for above-mentioned negative pressure-differential pressure forming process, fed protective gas in the time of also can being used to prepare the glassy metal of easy oxidation, to prevent its oxidation.
Example 1
Fusing magnesium-base metal glass material in resistance furnace, composition is Mg
65Cu
25Y
10Under the Ar gas shiled, melt, regulate the pouring temperature of control metal glass melt between 580～700 ℃ by PID.The specimen finish of red copper mould is 3mm.Utilize vacuum suction castable method to be shaped, at first by control valve 6, device for pressure measurement 7 and negative regulation device 8, the vacuum degree (vacuum) of negative pressure generator 5 control device is 8kPa.The suction tube of mould and lower end and the assembling pipe joint of upper end are connected.During cast, suction tube is inserted in the metal bath, the metal glass melt in the opening controlling valve, crucible enters in the die cavity of red copper mould by the suction tube rising under the effect of negative pressure.Casting mold is full of, and closed control valve is mentioned red copper mould and suction tube and left crucible.Unload suction tube, and the red copper mould is separated with connecting pipe.Open mould, take out part, thereby finished whole cast cavity filling process.Repeat said process, can carry out castable next time.Fig. 2 is the Mg-Cu-Y glassy metal rod that utilizes the diameter 3mm that vacuum suction castable method prepares, and maximum length can reach more than the 200mm.Fig. 3 is the metallographic structure of Mg-Cu-Y glassy metal, can't see the grain structure structure among the figure, and heat is analyzed (dsc analysis) and X-ray diffraction is indicated as glassy metal.
Example 2
Melting aluminum base metal glass material in resistance furnace, composition is Al
85Ni
5Y
8Co
2Under the Ar gas shiled, melt, regulate the pouring temperature of control metal glass melt between 700～750 ℃ by PID.The part of red copper mould is that average thickness is the plate part of 2mm.Utilize vacuum suction castable method to be shaped, at first by control valve 6, device for pressure measurement 7 and negative regulation device 8, the vacuum degree (vacuum) of negative pressure generator 5 control device is 10kPa.During cast, suction tube is inserted in the metal bath, the metal glass melt in the opening controlling valve, crucible enters in the die cavity of red copper mould by the suction tube rising under the effect of negative pressure.Casting mold is full of, and closed control valve is mentioned red copper mould and suction tube and left crucible.Unload suction tube, and the red copper mould is separated with connecting pipe.Open mould, take out part, thereby finished whole cast cavity filling process.Repeat said process, can carry out castable next time.
Example 3
Fusing magnesium-base metal glass material in resistance furnace, composition is Mg
75Ni
15Nd
10Under the Ar gas shiled, melt, regulate the pouring temperature of control metal glass melt between 650～750 ℃ by PID.The part die cavity of red copper mould is the thin plate of average wall thickness 2mm.Utilize negative pressure-differential pressure forming process to be shaped, at first by control valve 6, device for pressure measurement 7 and negative regulation device 8, the vacuum degree (vacuum) of negative pressure generator 5 control device is 5kPa.The suction tube of mould and lower end and the connecting pipe of upper end are connected.During cast, suction tube is inserted in the metal bath, utilize the gas pressure of metal glass melt liquid level in protective gas device and the flow pressure controller control crucible to be 10kPa.Metal glass melt in the opening controlling valve, crucible enters in the die cavity of red copper mould by the suction tube rising under the double action of negative pressure and liquid level air pressure.Casting mold is full of, and closed control valve is mentioned red copper mould and suction tube and left crucible.Unload suction tube, and the red copper mould is separated with connecting pipe.Open mould, take out part, thereby finished whole cast cavity filling process.Repeat said process, can carry out castable next time.
Claims (5)
1, a kind of cast moulding method of metal glass melt the steps include:
(1) chemical composition according to glassy metal requires alloyage, and alloy is added the melting furnace fusing;
(2) regulate the temperature of metal glass melt to the pouring temperature that requires;
(3) when the temperature of metal glass melt arrives pouring temperature, extract the gas in the mould, making it produce vacuum degree is the negative pressure of 5kPa～15kPa, and the metal glass melt in the attraction melting furnace in the crucible enters in the mold cavity, is configured as part.
2, method according to claim 1 is characterized in that: when feeding in raw material, feed protective gas in the crucible in melting furnace in step (1).
3, method according to claim 1 and 2 is characterized in that: during gas, feed protective gas in the crucible of melting furnace in step (3) extracts mould, this gas pressure is 10kPa～20kPa.
4, a kind of cast form device of metal glass melt, it is characterized in that: the crucible of with closure (2) is positioned at melting furnace (1), communicate by suction tube (4) between crucible (2) and the mould (3), negative pressure generator (5) links to each other by the upper end of connecting pipe with mould (3), on the connecting pipe of mould (3) and negative pressure generator (5) control valve (6), device for pressure measurement (7) and negative regulation device (8) is installed successively.
5, device according to claim 4 is characterized in that: an end of protective gas pipeline (9) links to each other with crucible (2), and the other end links to each other with protection source of the gas (12), and its tube connector is provided with flow pressure adjuster (10) and control valve (11).
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Families Citing this family (7)
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|---|---|---|---|---|
| CN101293277B (en) * | 2008-06-13 | 2010-06-02 | 清华大学 | Pressure difference injection moulding method and equipment for amorphous magnesium alloy |
| CN101797635B (en) * | 2010-02-08 | 2012-04-18 | 杭州大华仪器制造有限公司 | Vacuum negative-pressure self-casting device for melting crucibles |
| JP6417079B2 (en) * | 2012-02-29 | 2018-10-31 | ヘイシンテクノベルク株式会社 | Metal glass forming apparatus and metal glass rod-shaped member forming apparatus |
| CN102773461A (en) * | 2012-07-26 | 2012-11-14 | 无锡蠡湖叶轮制造有限公司 | Vacuum pressure injection furnace |
| CN106839764A (en) * | 2017-01-25 | 2017-06-13 | 苏州振湖电炉有限公司 | Variable frequency induction aluminium technique |
| CN106679419A (en) * | 2017-01-25 | 2017-05-17 | 苏州振湖电炉有限公司 | Frequency conversion induction aluminum furnace |
| US20200360986A1 (en) * | 2019-05-14 | 2020-11-19 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Casting metals |
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Assignee: Gaoyao Hongtai Precision Die Casting Co. Ltd. Assignor: Huazhong University of Science and Technology Contract fulfillment period: 2008.2.18 to 2013.8.18 contract change Contract record no.: 2009440000949 Denomination of invention: Metal glass melt cast moulding method and its device Granted publication date: 20071205 License type: Exclusive license Record date: 2009.7.29 |
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