CN102974807A - Method and device for improving liquid metal mold-filling capacity - Google Patents
Method and device for improving liquid metal mold-filling capacity Download PDFInfo
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- CN102974807A CN102974807A CN2012102708608A CN201210270860A CN102974807A CN 102974807 A CN102974807 A CN 102974807A CN 2012102708608 A CN2012102708608 A CN 2012102708608A CN 201210270860 A CN201210270860 A CN 201210270860A CN 102974807 A CN102974807 A CN 102974807A
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Abstract
Provided is a method and a device for improving liquid metal mold-filling capacity. A mold/ casting mold is designed into a conductive mold/ casting mold, the anode of a direct current is connected with one end of liquid metal, and the cathode of the direct current is connected with one end of the conductive mold/ casting mold. During a mold filling process of the liquid metal, the direct current is exerted on the ends of the liquid metal and the conductive mold/ casting mold. The device for improving the liquid metal mold-filling capacity comprises a heating casting ladle, a pull plug, a tungsten electrode, a direct current power supply, a metal mold and a mold cavity; the liquid metal is placed inside the heating casting ladle, the tungsten electrode is inserted in the liquid metal and is connected with the anode of the direct current power supply, the metal mold is connected with the cathode of the direct current power supply, and the pull plug is inserted in the pouring gate at the lower end of the heating casting ladle; and the heating casting ladle moves downward above the inlet of the mold cavity, the pull plug is opened, the liquid metal flows into the mold cavity, the liquid metal contacts the surface of the mold cavity, and a current loop is constituted. The method and the device for improving the liquid metal mold-filling capacity are without the need of changing chemical composition of the metal, have no pollution to mold-filling materials, is simple and flexible to implement, and low in cost, and can improve mold-filling capability of liquid conductive materials.
Description
Technical field
The invention belongs to the cast form field of metal, a kind of method that improves the liquid metal mold-filling capacity is provided especially.
Technical background
Liquid metal is shaped and comprises filling casting mold/mold cavity and two processes of cooled and solidified.Mold-filling capacity is not enough easily to produce the defectives such as misrun, shrinkage cavity or shrinkage porosite, pore, hot tearing, can't obtain the complex thin-wall foundry goods of clear-cut, and then have a strong impact on the mechanical property of foundry goods.Can improve from following two aspects the mold-filling capacity of liquid metal: (1) improves its mold-filling capacity by the flowability that improves liquid metal.The main thought of the method is to adjust or the interpolation alloying component, such as patent 03150926.6 and 200610159739.2.Patent 03150926.6 improves Al content, reduction Zn content in the alloy on existing AZ91 alloy basis, add rich Ce mixed rare earth and Ti element, increases in right amount the content of Be element, and purpose is to reduce the viscosity of liquid metal to improve mold-filling capacity.Chemical composition, introducing impurity element that the subject matter of the method is to change original alloy bring other problem when improving mold-filling capacity.(2) improve the mold-filling capacity of liquid metal by applying certain external condition: special coating is a kind of effective mode, such as patent 200810010437.8,03108033.2 and 200610159739.2, but bad adaptability and can pollute liquid metal.Producing negative pressure between liquid metal and mold cavity is a kind of approach, improves mold-filling capacity by negative pressure, such as patent 200810046636.4,88106919.1,200410009617.6 and 200510042917.9.This thought is widely adopted at present, but negative pressure is normally passed through the realization of pressure or vacuum, and the complicated cost of equipment is high.Another kind of mode is to apply a vibration/oscillating field to improve mold-filling capacity in liquid state, filled with metal mold cavity process, and such as patent 201110025744.5, but cost is high.
Summary of the invention
The present invention is directed to the deficiency that existing method exists, propose the auxiliary method of filling type raising liquid metal mold-filling capacity of DC current.
Basic principle of the present invention is to utilize DC current to improve the interfacial tension of liquid metal.If liquid metal connects the anode of dc source, conductive die connects negative electrode, and then the contact surface of liquid metal and mould consists of electrode and Presence of an interface tension force.This interfacial tension is not only relevant with the material of boundary layer, and closely related with the excess charges density of both sides, interface.Therefore, can reconcile interfacial tension by reconciling the direct current strength of flow.According to solidification theory, the auxiliary wetability that type can reduce liquid metal and mould contact surface, the heterogeneous forming core reduction viscosity in the inhibition cavity filling process, and then the raising mold-filling capacity that improves liquidity of filling of DC current.Improve simultaneously feeding, reduce shrinkage cavity and porosity and ardent tendency, and then improve compactness and the mechanical property of foundry goods.
The present invention is achieved by the following technical solutions.
Mould/casting mold is designed to conductive die/casting mold, the anode of DC current is connect the liquid metal end, the negative electrode of DC current connects conductive die/casting mold end, in the liquid metal cavity filling process, liquid towards metal end and conductive die/casting mold end applies DC current, to improve the interfacial tension of liquid metal, improve its mold-filling capacity.
The DC current that applies of the present invention, its strength range is 5-15A, should be according to the chemical composition of liquid metal when specifically selecting and the temperature when filling type determine.
DC current of the present invention puts on whole liquid metal cavity filling process, fills type until liquid metal and DC current is disconnected after complete.
DC current of the present invention loop is made of the liquid metal in the cavity filling process and conductive die/casting mold.
Method of the present invention is by realizing with lower device.
Device of the present invention comprises heating casting ladle (1), draw the cork (2), tungsten electrode (4), dc source (5), metal die (6) and mold cavity (7).Liquid metal (3) places in the heating casting ladle (1), tungsten electrode (4) inserts in the liquid metal (3) and joins with the anode of dc source (5), metal die (6) joins with the negative electrode of dc source (5), and draw the cork (2) are inserted in heating cast gate place, casting ladle (1) lower end.To heat casting ladle (1) and come downwards to the top of the entrance of mold cavity (7), but not contact with mould (6).Unlatching is drawn the cork (2), and liquid metal (3) flows into mold cavity (7), in case liquid metal (3) contacts with the surface of mold cavity (7), current loop consists of, and direct current plays a role.Obtain different liquid metal mold-filling capacity by adjusting current strength.
Advantage of the present invention is: the present invention utilizes DC current to improve the interfacial tension of liquid metal, need not change chemical composition, does not pollute filling shaped material; Method enforcement of the present invention is simple, flexible, cost is low, and method of the present invention can improve the mold-filling capacity of all electrically conductive liquid materials in conductive die/casting mold.
Description of drawings
Fig. 1 liquid metal fills type.1 for heating casting ladle, 2 for drawing the cork, 3 being mold cavity for metal die and 7 for dc source, 6 for tungsten electrode, 5 for liquid metal, 4.
Fig. 2 Al-5.9% Zn-2.20% Mg-1.70% Cu(wt.%) do not apply the microstructure of DC current.
Fig. 3 Al-5.9% Zn-2.20% Mg-1.70% Cu(wt.%) applies the microstructure of DC current.
The specific embodiment
The present invention will be described further by following examples.
Embodiment 1.Fill the type device.
In conjunction with Fig. 1 present embodiment is described.Present embodiment is applicable to the type that fills of liquid metal, and its device comprises heating casting ladle 1, draws the cork 2, liquid metal 3, tungsten electrode 4, dc source 5, metal die 6 and mold cavity 7.Liquid metal 3 places in the casting ladle 1, and tungsten electrode 4 inserts in the liquid metal and joins with the anode of dc source 5, and metal die 5 joins with the negative electrode of dc source 5.Unlatching draws the cork 2, and liquid metal 3 flows into mold cavity 7, in case liquid metal 3 contacts with the surface of mold cavity 7, current loop consists of, and direct current plays a role.Obtain different liquid metal mold-filling capacity by reconciling current strength.
Embodiment 2.Fill type device reference example 1, the chemical composition of liquid metal 3 is Al-5.9% Zn-2.20% Mg-1.70% Cu(wt.%), quality is 2kg, adjustment to 680 ℃, the preheat temperature of metal die 6 is 200 ℃, and mold cavity 7 is the cylindrical cavity of Φ 6mm * 500mm.
Do not apply DC current: cylinder length 183mm, density is 2.651 * 10
3Kg/m
3, warmly existing, microstructure is seen Fig. 2, and the as cast condition yield strength is 270Mpa, and the as cast condition percentage elongation is about 6%.
Apply DC current: current strength 6A, application time 3s: cylinder length 317mm, density is 2.664 * 10
3Kg/m
3, without ardent, microstructure is seen Fig. 3, and the as cast condition yield strength is 281Mpa, and the as cast condition percentage elongation is about 9%.
Embodiment 3.Fill type device reference example 1, the chemical composition of liquid metal 3 is Al-18% Si, and quality is 3kg, adjustment to 710 ℃, and the preheat temperature of metal die 6 is 210 ℃, mold cavity 7 is the cylindrical cavity of Φ 6mm * 1000mm.
Do not apply DC current: cylinder length 327mm, density is 2.676 * 10
3Kg/m
3
Apply DC current: current strength 5A, application time 5s: cylinder length 602mm, density is 2.710 * 10
3Kg/m
3
Embodiment 4.Fill type device reference example 1, the chemical composition of liquid metal 3 is Mg-9% Al, and quality is 1.8kg, adjustment to 650 ℃, and the preheat temperature of metal die 6 is 230 ℃, mold cavity 7 is the cylindrical cavity of Φ 6mm * 800mm.
Do not apply DC current: cylinder length 236mm, density is 1.610 * 10
3Kg/m
3
Apply DC current: current strength 6A, application time 4s: cylinder length 384mm, density is 1.682 * 10
3Kg/m
3
Embodiment 5.Fill type device reference example 1, the chemical composition of liquid metal 3 is Mg-3%Al, and quality is 2kg, adjustment to 680 ℃, and the preheat temperature of metal die 6 is 230 ℃, mold cavity 7 is the cylindrical cavity of Φ 6mm * 800mm.
Do not apply DC current: cylinder length 209mm, density is 1.591 * 10
3Kg/m
3, exist ardent.
Apply DC current: current strength 15A, application time 3s: cylinder length 326mm, density is 1.627 * 10
3Kg/m
3, without ardent.
Can find out significantly by above embodiment, adopt the inventive method, can improve well the mold-filling capacity of liquid metal with improving.The above only is embodiments of the present invention, does not limit the present invention, all within the spirit and principles in the present invention any modification, be equal to and replace and improve, all should be included in protection scope of the present invention.Especially, as content embed category of the present invention being similar to the new thought of generation in the method described in the technical background, also in the protection domain of this patent.
Claims (3)
1. method that improves the liquid metal mold-filling capacity, it is characterized in that mould/casting mold is designed to conductive die/casting mold, the anode of DC current is connect the liquid metal end, the negative electrode of DC current connects conductive die/casting mold end, in the liquid metal cavity filling process, liquid towards metal end and conductive die/casting mold end applies DC current, fills type until liquid metal and DC current is disconnected after complete.
2. the method for raising liquid metal mold-filling capacity according to claim 1 is characterized in that the described DC current that applies, and its strength range is 5-15A.
3. a device of realizing the method for raising liquid metal mold-filling capacity claimed in claim 1 is characterized in that comprising heating casting ladle (1), draw the cork (2), tungsten electrode (4), dc source (5), metal die (6) and mold cavity (7); Liquid metal places in heating casting ladle (1), and tungsten electrode (4) inserts in the liquid metal and joins with the anode of dc source (5), and metal die (6) joins with the negative electrode of dc source (5), and draw the cork (2) are inserted in heating cast gate place, casting ladle (1) lower end; Heating casting ladle (1) comes downwards to the top of the entrance of mold cavity (7), opens and draws the cork (2), and liquid metal (3) flows into mold cavity (7), and liquid metal (3) contacts with the surface of mold cavity (7), consists of current loop.
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| CN2012102708608A CN102974807A (en) | 2012-08-01 | 2012-08-01 | Method and device for improving liquid metal mold-filling capacity |
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| CN2012102708608A CN102974807A (en) | 2012-08-01 | 2012-08-01 | Method and device for improving liquid metal mold-filling capacity |
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Citations (8)
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|---|---|---|---|---|
| JPH0347668A (en) * | 1989-07-11 | 1991-02-28 | Nkk Corp | Method for controlling solidified structure in cast slab |
| DE19614182C1 (en) * | 1996-04-11 | 1997-07-31 | Inteco Int Techn Beratung | Water-cooled casting die for production of blocks or strips |
| WO2002038820A2 (en) * | 2000-11-10 | 2002-05-16 | Inteco Internationale Technische Beratung Ges. M.B.H. | Method for producing metal blocks or bars by melting off electrodes and device for carrying out this method |
| TW524853B (en) * | 1999-02-23 | 2003-03-21 | Gen Electric | Bottom pour electroslag refining systems and methods |
| WO2005099934A2 (en) * | 2004-04-13 | 2005-10-27 | Hahn-Meitner-Institut Berlin Gmbh | Method and arrangement for crystal growth from fused metals or fused solutions |
| CN101100705A (en) * | 2007-07-25 | 2008-01-09 | 上海大学 | Method for solidifying microlite by impulse current liquid surface disturbance |
| CN101237951A (en) * | 2005-08-02 | 2008-08-06 | 德累斯顿协会莱布尼茨固体材料研究所 | Process for producing metal-containing castings, and associated apparatus |
| JP2009195911A (en) * | 2008-02-19 | 2009-09-03 | Sintokogio Ltd | Method for casting aluminum alloy casting product and apparatus therefor |
-
2012
- 2012-08-01 CN CN2012102708608A patent/CN102974807A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0347668A (en) * | 1989-07-11 | 1991-02-28 | Nkk Corp | Method for controlling solidified structure in cast slab |
| DE19614182C1 (en) * | 1996-04-11 | 1997-07-31 | Inteco Int Techn Beratung | Water-cooled casting die for production of blocks or strips |
| TW524853B (en) * | 1999-02-23 | 2003-03-21 | Gen Electric | Bottom pour electroslag refining systems and methods |
| WO2002038820A2 (en) * | 2000-11-10 | 2002-05-16 | Inteco Internationale Technische Beratung Ges. M.B.H. | Method for producing metal blocks or bars by melting off electrodes and device for carrying out this method |
| WO2005099934A2 (en) * | 2004-04-13 | 2005-10-27 | Hahn-Meitner-Institut Berlin Gmbh | Method and arrangement for crystal growth from fused metals or fused solutions |
| WO2005099934A3 (en) * | 2004-04-13 | 2006-03-16 | Hahn Meitner Inst Berlin Gmbh | Method and arrangement for crystal growth from fused metals or fused solutions |
| CN101237951A (en) * | 2005-08-02 | 2008-08-06 | 德累斯顿协会莱布尼茨固体材料研究所 | Process for producing metal-containing castings, and associated apparatus |
| CN101100705A (en) * | 2007-07-25 | 2008-01-09 | 上海大学 | Method for solidifying microlite by impulse current liquid surface disturbance |
| JP2009195911A (en) * | 2008-02-19 | 2009-09-03 | Sintokogio Ltd | Method for casting aluminum alloy casting product and apparatus therefor |
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Application publication date: 20130320 |