CN103170606B - Dual pressure homogenising is prepared the device of metal paste and shapes method - Google Patents
Dual pressure homogenising is prepared the device of metal paste and shapes method Download PDFInfo
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- CN103170606B CN103170606B CN201110439165.5A CN201110439165A CN103170606B CN 103170606 B CN103170606 B CN 103170606B CN 201110439165 A CN201110439165 A CN 201110439165A CN 103170606 B CN103170606 B CN 103170606B
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Abstract
The present invention relates to a kind of dual pressure homogenising prepare the device of metal paste and shape method, device comprises control lever, prefabricated chamber, main coil, discharge nozzle, secondary coil, thermocouple, slurry outlet, dreg collecting slot, feed tube, heating and heat-insulation layer, thermocouple, alloy inlet, liquid surface height sensor and pneumatic tube etc., control lever is that radial symmetric body is positioned at center, prefabricated chamber, and around distribute feed tube, liquid surface height sensor and pneumatic tube etc.; Discharge nozzle is positioned at bottom, prefabricated chamber, lateral arrangement; The heat-insulation layer that main coil and secondary coil are arranged in prefabricated chamber and discharge nozzle is outside, and metal bath stands the electromagnetic agitation of main coil generation and/or the mechanical agitation of control lever rotation in prefabricated chamber; In discharge nozzle, secondary stands the strengthening stirring action of secondary coil.Apparatus of the present invention and method simple, metal bath uniformization effect after compound and secondary hardening stir is remarkable, can alloying component be obtained evenly, premium casting that crystal grain is more tiny.
Description
Technical field
The present invention relates to a kind of dual pressure homogenising prepare the device of metal paste and shape method, the metallic alloy slurry manufacturing the brilliant foundry goods of Uniform Slender can be obtained by these apparatus and method, belong to non-ferrous metals casting and processing technique field.
Background technology
Traditional metal casting and process technology are usually all for superheated melt or solid metallic, and such as die casting, continuous casting and liquid forging etc., require molten metal overheated more than 80 DEG C, too low pouring temperature, just face poor fluidity and misrun, the defect such as crackle, segregation; Extrusion molding is then only for solid-state minority deforming alloy, and most alloy very easily ruptures due to its thick dendrite skeleton organization and cannot realize.In recent years, the semi-solid processing of metal becomes study hotspot, and it realizes shaping to partly solid, the semi-liquid metal containing Part-spherical solid phase, thus obtain the non-dendritic structure foundry goods of high-quality.
In order to obtain this semi-solid metal slurry containing Part-spherical solid phase, people have invented multiple preparation method, such as: electromagnetic agitation, various mechanical agitation, ultrasonic vibration etc.But these method and apparatus all could not meet the requirement of following several respects simultaneously:
1, enough large to the shear strength of metal paste, can turbulent effect be produced;
2, except preparing semi solid slurry, the pressure Homogenization Treatments to low-temperature melt and shaping is also focused on.This homogeneous melt shapes and eliminates defect, improves Packing character and grain size;
3, have certain volume due to contrive equipment and cannot close to process equipment, this just requires that metal paste is in the process having certain transmission range, and the uniformization effect of stirring does not weaken, and even can be enhanced;
4, the flow of prepared metal paste supply and pressure etc. can conservative control.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention proposes a kind of simple and easy to do and application is wide, function is complete, integrating the above new technique expecting to require.
The present invention realizes mainly through following technical scheme:
A kind of dual pressure homogenising prepares the device of metal paste, comprise control lever, prefabricated chamber, main coil, discharge nozzle, secondary coil, thermocouple, slurry outlet, dreg collecting slot, feed tube, heating and heat-insulation layer, thermocouple, alloy inlet, liquid surface height sensor and pneumatic tube etc., wherein, control lever is that radial symmetric body is positioned at center, prefabricated chamber, and around distribute feed tube, liquid surface height sensor and pneumatic tube etc.; Discharge nozzle is positioned at bottom, prefabricated chamber, lateral arrangement; The heat-insulation layer that main coil and secondary coil are arranged in prefabricated chamber and discharge nozzle is outside, metal bath (comprising alloy melt) stands the electromagnetic agitation of main coil generation and/or the mechanical agitation of control lever rotation in prefabricated chamber, carries out the pretreatment of pressure homogenising; Also in discharge nozzle, secondary stands the strengthening stirring action of secondary coil.
Metal bath in prefabricated chamber can stand the electromagnetic agitation of main coil generation or the stirring action of control lever rotation respectively or simultaneously, especially, when contrary with control lever sense of rotation, between control lever outer rim and prefabricated chamber gap, electromagnetic force direction is very narrow, device produces superpower shearing, high action of turbulent flow to Metal Melting physical efficiency; Further, metal bath continues the secondary agitation standing secondary coil in discharge nozzle, and this dual pressure homogenising is more lasting, remarkable to the homogenizing effect of melt.Discharge nozzle is lateral arrangement, and make slurry outlet can not be subject to pre-formed cavity long-pending restriction to any direction feed, flow is more easy to control simultaneously.
In device of the present invention, the lower end of control lever is conical valve head, and the stage casing of control lever is the radial symmetric body of column, its outer rim be provided with projection or blade structure be beneficial to stirring action; Control lever can rotation or move up and down, and regulates melt to the supply flow rate of discharge nozzle by conical valve head; The diameter in control lever stage casing can change, to adjust the clearance distance in outer rim and prefabricated chamber.
Liquid surface height sensor provides melt liquid level height and pressure signal in real time, sends into protective gas by pneumatic tube, forms malleation or negative pressure on top, prefabricated chamber, controls the flow of slurry outlet further.
Dreg collecting slot is positioned at the bottom in prefabricated chamber, the below of feed tube, and the lower port of feed tube can be submerged in the melt of dreg collecting slot; For supplementary metal bath (molten metal) when the alloy inlet of feed tube upper end is opened, during closedown, be used for pressurize.
Discharge nozzle lateral arrangement, can to vert up or down certain angle according to the needs of different occasion, or entirety is clockwise or anticlockwise horizontal rotates to an angle, make slurry outlet can not be subject to pre-formed cavity long-pending restriction to any direction feed or movement, flow is more easy to control simultaneously.
Heating and heat-insulation layer are coated on whole prefabricated chamber and discharge nozzle is outside, and thermocouple is arranged in heating and heat-insulation layer, and temperature is controlled in real time by thermocouple.
The temperature-controllable of device entirety.When the preparation carrying out low temperature homogeneous melt with add man-hour, in prefabricated chamber and discharge nozzle, metal bath temperature must control at liquidus temperature T
0~ T
0+ 50 DEG C of (T
sfor solidus temperature, T
0liquidus temperature) in scope; When the preparation carrying out semi solid slurry with add man-hour, in prefabricated chamber and discharge nozzle, metal bath temperature must control at solidus temperature T
s~ T
0scope in.
Slurry outlet can be connected to any process equipment, and the metal paste provided by slurry outlet must control at T
s~ T
0shape in the temperature range of+50 DEG C.Process equipment comprises die casting machine, casting and rolling machine, conticaster, die forging machine and extruder etc.
Present invention also offers a kind of metal paste obtaining the brilliant foundry goods of Uniform Slender and prepare the method be shaped.
What dual pressure homogenising prepared metal paste shapes a method, comprises the steps:
(1) firing equipment (thermocouple) of first starting drive, makes control lever valve head in the closed position downwards, sets prefabricated cavity temperature and discharge nozzle temperature;
(2) when the temperature in prefabricated chamber and discharge nozzle reaches and is stabilized in design temperature, send into protective gas from pneumatic tube, inject metal bath from feed tube, liquid level is monitored in real time by liquid level sensor;
(3) when liquid level reaches prefabricated chamber 2/3 height, main coil electromagnetic agitation and control lever rotation stirring is started; Promote control lever, make metal bath be full of discharge nozzle and carry out secondary electromagnetic agitation, simultaneously continuous from feed tube feeding to maintain liquid level in prefabricated chamber 2/3.
Slurry outlet flows out the metal paste obtaining dual pressure homogenising and prepare.Be connected with the Casting or rolling nozzle of level at slurry outlet place, carried out the sheet material casting of Uniform Slender crystalline substance through the homogenize such alloys melt of compound, Double stirring by lip Continuous Flow to roll.
The present invention first adopts the composite stirring method of the control lever of rotation and the rotary electromagnetic field of main coil induction, implement to force homogenising pretreatment to the metal bath in prefabricated chamber, homogeneous melt again experiences the electromagnetic agitation intensive treatment that secondary coil produces subsequently in the discharge nozzle of cross-feeding.Before shaping, the supply of melt slurry and flowing pressure can be controlled respectively by control lever and pneumatic tube; Liquid level in prefabricated chamber can be monitored in real time by liquid surface height sensor.Finally, realize shaping through forcing the metal paste (comprising low-temperature melt or semi solid slurry) of Homogenization Treatments to feed to conventional process tools from slurry outlet.
The present invention has the following advantages:
1, machinery and electromagnetic agitation are complex as a whole by the present invention, can produce Strong shear, high action of turbulent flow to melt slurry.Meanwhile, supplement the secondary hardening electromagnetic agitation in slurry transport process, dual pressure homogenising is more lasting, remarkable to the homogenizing effect of melt.
2, homogeneous alloy melt and semi solid slurry can be prepared, have wide range of applications.
3, can fixing quantity metal paste feed time flow and pressure.
4, horizontal running channel design can make slurry convenient to multi-angle and direction feed, is applicable to being connected with various casting, process equipment.
5, whole apparatus structure is simply compact, and easy to use and flexible easily controls.
Below by the drawings and specific embodiments, the present invention will be further described, but and do not mean that limiting the scope of the invention.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the metallographic structure figure of the AZ31 magnesium alloy plate that embodiment 1 obtains.
Fig. 3 is the metallographic structure figure of the AZ91D magnesium alloy die casting that embodiment 2 obtains.
Description of reference numerals:
1 control lever 8 dreg collecting slot
2 prefabricated chamber 9 feed tubes
3 main coils 10 heat and heat-insulation layer
4 discharge nozzle 11 thermocouples
5 secondary coil 12 alloy inlet
6 thermocouple 13 liquid surface height sensors
7 slurry outlet 14 pneumatic tubes
Detailed description of the invention
As shown in Figure 1, be the structural representation of apparatus of the present invention.Dual pressure homogenising of the present invention prepares the device of metal paste, preparation and the feedway of a kind of metal homogeneous melt or semi solid slurry, comprise control lever 1, prefabricated chamber 2, main coil 3, discharge nozzle 4, secondary coil 5, thermocouple 6, slurry outlet 7, dreg collecting slot 8, feed tube 9, heating and heat-insulation layer 10, thermocouple 11, alloy inlet 12, liquid surface height sensor 13 and pneumatic tube 14, wherein, control lever 1 is center, prefabricated chamber 2 for radial symmetric body is positioned at, around distribution feed tube 9, liquid surface height sensor 13 and pneumatic tube 14 etc.; Discharge nozzle 4 is positioned at bottom, prefabricated chamber 2, lateral arrangement; The heat-insulation layer that main coil 3 and secondary coil 5 are arranged in prefabricated chamber 2 and discharge nozzle 4 is outside, metal bath in prefabricated chamber 2 can stand the electromagnetic agitation of main coil 3 generation or the mechanical agitation of control lever rotation respectively or simultaneously, carries out the pretreatment of pressure homogenising; Metal bath goes back the strengthening stirring action that secondary subjected to secondary coil 5 in discharge nozzle 4.
Particularly, control lever 1 lower end is conical valve head.Except energy rotation, control lever 1 can also move up and down, and regulates melt to the supply flow rate of discharge nozzle by valve head, controls melt supply; Control lever 1 stage casing is the radial symmetric body of column, projection or blade structure can be had to be beneficial to stirring action in its outer rim; The diameter in control lever 1 stage casing can change, to adjust the clearance distance in outer rim and prefabricated chamber 2.
Dreg collecting slot 8 is positioned at bottom prefabricated chamber 2, the below of feed tube 9, and the lower port of feed tube 9 can be submerged in the melt of dreg collecting slot 8; The alloy inlet 12 of feed tube 9 upper end can open supplementary molten metal, or pressurize when closing.
When preparing semi solid slurry, for making up the deficiency of natural fluidity, devise forcing pipe.The liquid level provided in real time according to liquid surface height sensor 13 and pressure signal, the protective gas controlled in pneumatic tube 14 forms malleation or negative pressure on top, prefabricated chamber 2, regulates slurry supply pressure, controls the flow of slurry outlet further.
Discharge nozzle 4 lateral arrangement, can to vert up or down certain angle according to the needs of different occasion, or overall (or counterclockwise) clockwise horizontally rotates certain angle, make slurry outlet can not be subject to the restriction of prefabricated chamber 2 volume to any direction feed or movement, flow is more easy to control simultaneously.
Whole prefabricated chamber 2 and discharge nozzle 4 outside are coated with heating and heat-insulation layer 10, and be provided with thermocouple 11,6 in heating and heat-insulation layer 10, temperature is controlled in real time by thermocouple 11,6.
When the preparation carrying out low temperature homogeneous melt with add man-hour, in prefabricated chamber 2 and discharge nozzle 4, molten metal temperature must control at liquidus temperature T
0~ T
0within the scope of+50 DEG C; When the preparation carrying out semi solid slurry with add man-hour, in prefabricated chamber 2 and discharge nozzle 4, metal paste temperature must control at solidus temperature T
s~ T
0scope in.
Slurry outlet 7 can be connected to any process equipment, and the metal paste provided by slurry outlet 7 must control at T
s~ T
0shape in the temperature range of+50 DEG C.Process equipment comprises die casting machine, casting and rolling machine, conticaster, die forging machine and extruder etc.
What dual pressure homogenising of the present invention prepared metal paste shapes method, adopts the said equipment, can obtain the metal paste of the brilliant foundry goods of Uniform Slender.Method comprises the steps:
(1) firing equipment of first starting drive, i.e. thermocouple 6,11, makes control lever 1 valve head in the closed position downwards, sets prefabricated chamber 2 temperature and discharge nozzle 4 temperature;
(2) when the temperature in prefabricated chamber 2 and discharge nozzle 4 reaches and is stabilized in design temperature, send into protective gas from pneumatic tube 14, inject metal bath from feed tube 9, liquid level is monitored in real time by liquid level sensor 13;
(3) when liquid level reaches 2/3 height in prefabricated chamber 2, main coil 3 electromagnetic agitation and control lever 1 rotation stirring is started; Promote control lever 1, make metal bath be full of discharge nozzle 4 and carry out secondary electromagnetic agitation, simultaneously continuous from feed tube 9 feeding to maintain liquid level in 2/3 of prefabricated chamber 2.
Be connected with the Casting or rolling nozzle of level at slurry outlet place, carried out the sheet material casting of Uniform Slender crystalline substance through the homogenize such alloys melt of compound, Double stirring by lip Continuous Flow to roll.
Embodiment 1
The present embodiment is that the inventive method is applied to two rod horizontal rehoroll-casting AZ31 magnesium alloy plate
First the firing equipment of starting drive, i.e. thermocouple 6,11, make control lever 1 valve head in the closed position downwards.Set that prefabricated chamber 2 temperature is 645 DEG C, discharge nozzle 4 temperature is 635 DEG C.When the temperature in prefabricated chamber 2 and discharge nozzle 4 reaches and is stabilized in design temperature, send into protective gas from pneumatic tube 14, inject the AZ31 magnesium alloy liquid pressure of 650 DEG C from feed tube 9, liquid level is monitored in real time by liquid level sensor 13.When liquid level reaches 2/3 height in prefabricated chamber 2, start main coil 3 electromagnetic agitation and control lever 1 rotation stirring.Promote control lever 1, make melt be full of discharge nozzle 4 and carry out secondary electromagnetic agitation.Meanwhile, continuously from feed tube 9 feeding to maintain liquid level in 2/3 of prefabricated chamber 2.Be connected with the Casting or rolling nozzle of level at slurry outlet 7 place, the homogenize such alloys melt through compound, Double stirring carries out sheet material casting by lip Continuous Flow to roll.
The AZ31 magnesium alloy plate that the present embodiment obtains has the feature of Uniform Slender crystalline substance, and as shown in Figure 2, light areas is primary α-Mg fine grained texture, and darker regions is eutectic structure in its metallographic structure.
Embodiment 2
The present embodiment is that the inventive method is applied to rheo-diecasting AZ91D Mg alloy castings
First the firing equipment of starting drive, i.e. thermocouple 6,11, make control lever 1 valve head in the closed position downwards.Set that prefabricated chamber 2 temperature is 605 DEG C, discharge nozzle 4 temperature is 595 DEG C.When the temperature in prefabricated chamber 2 and discharge nozzle 4 reaches and is stabilized in design temperature, send into protective gas from pneumatic tube 14, inject the AZ91 magnesium alloy liquid pressure of 610 DEG C from feed tube 9, liquid level is monitored in real time by liquid level sensor 13.When liquid level reaches 2/3 height in prefabricated chamber 2, start main coil 3 electromagnetic agitation and control lever 1 rotation stirring.Promote control lever 1, make slurry be full of discharge nozzle 4 and carry out secondary electromagnetic agitation.Meanwhile, continue from feed tube 9 feeding to maintain liquid level in 2/3 of prefabricated chamber 2.At slurry outlet 7, place is connected with downward bend pipe, to be connected with the injection chamber of die casting machine.Semi solid slurry can be pressurizeed by pneumatic tube to the flow of injection chamber feed and pressure and improve.Finally, the semisolid foundry goods of Uniform Slender crystalline substance is under high pressure cast into through the semi solid slurry of compound, Double stirring.
The AZ91D magnesium alloy die casting that the present embodiment obtains has the feature of Uniform Slender crystalline substance, and as shown in Figure 3, light areas is primary α-Mg fine grained texture, and darker regions is eutectic structure in its metallographic structure.
The pressure homogenising principle that the present invention adopts compound and Double stirring to produce prepares metal bath and semi solid slurry, multiple conventional process tools can be connected, such as: die casting machine, casting and rolling machine, conticaster, die forging machine, extruder etc., various the shaping forcing homogenising melt is realized.
Apparatus of the present invention and method simple, low-temperature melt (liquidus temperature T
0~ T
0+ 50 DEG C) or semi solid slurry (solidus temperature T
s~ T
0) after compound and secondary hardening stir, uniformization effect is remarkable, composition than conventional method processing alloy can be obtained evenly, premium casting that crystal grain is more tiny.
Claims (10)
1. a dual pressure homogenising prepares the device of metal paste, it is characterized in that: it comprises control lever, prefabricated chamber, main coil, discharge nozzle, secondary coil, thermocouple, slurry outlet, dreg collecting slot, feed tube, heating and heat-insulation layer, thermocouple, alloy inlet, liquid surface height sensor and pneumatic tube, described control lever is that radial symmetric body is positioned at center, described prefabricated chamber, distribute around it feed tube, liquid surface height sensor and pneumatic tube, the diameter in control lever stage casing can change, to adjust the clearance distance in outer rim and prefabricated chamber; Discharge nozzle is positioned at bottom, prefabricated chamber, lateral arrangement; The heat-insulation layer that main coil and secondary coil are arranged in prefabricated chamber and discharge nozzle is outside, metal bath stands the electromagnetic agitation of main coil generation and the mechanical agitation of control lever rotation in prefabricated chamber, electromagnetic force direction is contrary with control lever sense of rotation, and also in discharge nozzle, secondary stands the strengthening electromagnetic agitation of secondary coil.
2. dual pressure homogenising according to claim 1 prepares the device of metal paste, it is characterized in that: the lower end of described control lever is conical valve head, control lever can move up and down, regulate melt to the supply flow rate of discharge nozzle by described conical valve head, the stage casing of described control lever is the radial symmetric body of column, is provided with projection or blade in its outer rim.
3. dual pressure homogenising according to claim 1 prepares the device of metal paste, it is characterized in that: send into protective gas by pneumatic tube, forms malleation or negative pressure on top, prefabricated chamber, controls the flow of slurry outlet.
4. dual pressure homogenising according to claim 1 prepares the device of metal paste, it is characterized in that: described dreg collecting slot is positioned at the bottom in prefabricated chamber, the below of feed tube, and the lower port of described feed tube is submerged in the melt of dreg collecting slot; The alloy inlet of feed tube upper end supplements molten metal when opening, pressurize during closedown.
5. dual pressure homogenising according to claim 1 prepares the device of metal paste, it is characterized in that: described discharge nozzle can vert up or down, or clockwise overall or anticlockwise horizontal rotation.
6. dual pressure homogenising according to claim 1 prepares the device of metal paste, it is characterized in that: described heating and heat-insulation layer are coated on described prefabricated chamber and discharge nozzle is outside, and described thermocouple is arranged in heating and heat-insulation layer.
7. dual pressure homogenising according to claim 1 prepares the device of metal paste, it is characterized in that: in described prefabricated chamber and discharge nozzle, the treatment temperature of metal bath controls at T
s~ T
0in the scope of+50 DEG C, T
sfor solidus temperature, T
0for liquidus temperature.
8. dual pressure homogenising according to claim 1 prepares the device of metal paste, and it is characterized in that: described slurry outlet is connected to process equipment, the metal paste provided by slurry outlet is at T
s~ T
0shape in the temperature range of+50 DEG C, T
sfor solidus temperature, T
0for liquidus temperature.
9. dual pressure homogenising according to claim 8 prepares the device of metal paste, it is characterized in that: described process equipment comprises die casting machine, casting and rolling machine, conticaster, die forging machine and extruder.
10. what dual pressure homogenising prepared metal paste shapes a method, adopts the device according to any one of claim 1-9, comprises the steps:
(1) thermocouple of first starting drive, makes control lever valve head in the closed position downwards, sets prefabricated cavity temperature and discharge nozzle temperature;
(2) when the temperature in prefabricated chamber and discharge nozzle reaches and is stabilized in design temperature, send into protective gas from pneumatic tube, inject metal bath from feed tube, liquid level is monitored in real time by liquid level sensor;
(3) when liquid level reaches prefabricated chamber 2/3 height, main coil electromagnetic agitation and control lever rotation stirring is started; Promote control lever, make metal bath be full of discharge nozzle and carry out secondary electromagnetic agitation, simultaneously continuous from feed tube feeding to maintain liquid level in prefabricated chamber 2/3.
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| CN103447549B (en) * | 2013-09-13 | 2015-02-25 | 重庆文理学院 | Preparation method of cobalt nanosphere |
| CN105779779B (en) * | 2014-12-22 | 2017-12-26 | 北京有色金属研究总院 | A kind of electromagnetic agitation high shear melt treatment and self-clearing apparatus and method |
| CN113523218A (en) * | 2021-06-30 | 2021-10-22 | 北京科技大学 | Casting device and method for homogenizing high-temperature alloy structure |
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Effective date of registration: 20210727 Address after: 101407 No.11, Xingke East Street, Yanqi Economic and Technological Development Zone, Huairou District, Beijing Patentee after: Youyan metal composite technology Co.,Ltd. Address before: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee before: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |