CN101032739A - Method for producing semi-solid state sizing agent for founding and the producing device - Google Patents
Method for producing semi-solid state sizing agent for founding and the producing device Download PDFInfo
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- CN101032739A CN101032739A CN 200610041892 CN200610041892A CN101032739A CN 101032739 A CN101032739 A CN 101032739A CN 200610041892 CN200610041892 CN 200610041892 CN 200610041892 A CN200610041892 A CN 200610041892A CN 101032739 A CN101032739 A CN 101032739A
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Abstract
The present invention relates to process and apparatus for preparing semi-solid slurry for casting, and aims at raising quality of semi-solid slurry. The process of preparing semi-solid slurry with chilling and/or mechanical vibrating includes making molten metal liquid flow to the casting mold in a flow guide device with cooling effect, controlling the temperature of the flow guide device below liquid temperature of the metal for the metal liquid to grow crystal via chilling, flushing the fine crystal with the flowing metal liquid to make it produce necking, crack and breaking and fuse into the liquid flow so as to form semi-solid slurry, and injecting the slurry into casting mold to complete semi-solid casting. The present invention has the features of low cost, simple technological process, and capacity of obtain semi-solid slurry with rich well dispersed and well nodularized solid particles.
Description
(1) technical field under
The present invention relates to the material field, is a kind of preparation method and preparation facilities of casting with semi solid slurry.
(2) background technology
In recent years, the semisolid Metal Processing forming technique more and more causes people's attention.Characteristics such as the semi-solid casting forming technique is improved the quality of products because of it has than traditional liquid cast, energy savings, productivity ratio height are considered to one of most important metal processing and molding technology of 21st century.The metal semi-solid casting mainly contains two kinds of citation forms at present, is respectively rheocasting and thixotroping casting.
Rheocasting is meant the temperature range that over-heat metal liquid is cooled fast to the solid-liquid coexistence, and in process of setting, alloy is applied strong stirring, its solid phase is suspended in a large amount of tiny equiax crystal or spherocrystal form forms semi solid slurry in the liquid phase, and semi solid slurry is injected die cavity finish follow-up shaping and solidify fully by penetrating device.The thixotroping casting then is meant earlier the semi solid slurry for preparing to be cast and is ingot, cuts into the blank of certain size, reheats the semi-solid state in solid-liquid two-phase coexistent interval during use again, realizes part forming via casting then.Because the mechanical characteristic of thixotroping casting semi solid slurry itself, the thixotroping casting realizes by the die casting mode usually.Because the quantity of solid phase particle and yardstick have directly with the casting quality performance and get in touch in the semi solid slurry, no matter are rheocasting or thixotroping foundry engieering, past contact need adopt chemical method to promote grain refinement.
Compare with traditional liquid cast, semi solid slurry is owing to possess the characteristic that homogenizes preferably, wherein there is solid phase particle than horn of plenty, in process of setting, can constitute a large amount of growth cores, it is tiny even to make casting solidification organize, convection current shear action in the semi solid slurry preparation process makes disappearance of dendrite network skeleton and the reservation dispersed particles shape tissue morphology that conventional cast is easy to form simultaneously, avoided the formation of thick dendrite like this, reduced the probability that defectives such as the segregation degree of foundry goods and shrinkage cavity shrinkage porosity produce, can effectively eliminate segregation, defectives such as crackle, and significantly improve the mechanical performance of foundry goods.Simultaneously, semi solid slurry still has good flowability in Mushy Zone, for die-casting technique, adopts the forming temperature of the semi solid slurry temperature can be far below alloy liquid cast of the same race the time, has prolonged the service time of mold to a great extent.In addition, the high fluidity that semi solid slurry itself is had makes and can adopt low speed die casting in the semisolid press casting procedure, has avoided high speed die casting to be involved in the shortcoming of gas, makes the semisolid die casting to come the reinforced alloys performance by subsequent heat treatment.These advantages make the semi-solid casting technology for making become the advanced new technology of extensive concern.
The main difficulty that semi-solid casting technology for making popularization is at present met with is that its production cost is usually above traditional liquid cast technology; And on the other hand, foundry enterprise reduced cost than more pay attention in the past.The thixotroping casting is because thixotroping ingot casting own is produced and transportation is comparatively simple, it once was the main semi-solid casting technology for making that adopts in the industrial production, but today, rheocasting was progressively made way in its leading role status, its reason be rheocasting the performance of foundry goods be better than the foundry goods that the thixotroping casting is produced usually, application mode is more various, and the production and the transportation problem of the employed semi solid slurry of rheocasting have also progressively obtained solution simultaneously.For reducing semi-solid casting The Application of Technology cost, the patent No. is that 6880613 United States Patent (USP) has proposed a kind of new semi solid slurry production method, this method places different crucibles with two kinds of alloys and is heated to the different fixed temperatures of giving in advance, then makes slurry temperature be adjusted into suitable numerical value two kinds of metal collection and keeps special time to form semi solid slurry.The semi solid slurry that this method is prepared injects casting mold, can finish the rheocasting process.
Nonetheless, existing preparation method of semisolid state slurry thereof still exists equipment complexity, production cost is higher, stock quality is relatively poor problem, is difficult to obtain large-scale promotion application, also rests on the laboratory development at present.
(3) summary of the invention
There are existing equipment complexity in the preparation method of semisolid state slurry thereof, the higher deficiency of cost in the prior art for overcoming, improve the semi solid slurry quality simultaneously, the present invention proposes a kind of new preparation method of semisolid state slurry thereof.
The technical solution adopted in the present invention is to adopt the method for Quench or adopt Quench and mechanical vibration method to obtain semi solid slurry, even the molten metal after the fusing flow in the casting mold along the air deflector with cooling effect, and the temperature of air deflector is controlled at below the liquidus temperature of alloy, make molten metal wall Quench crystalline growth within it when flowing through air deflector, simultaneously under the mobile souring of molten metal itself, make the thin brilliant necking down that produces of Quench, fracture or broken, and then washed away fracture by liquid stream and incorporate liquid stream, thereby form the semi solid slurry of liquid-solid coexistence, the slurry for preparing is injected casting mold, finish semi-solid casting.
One of preferred version of the present invention is the temperature by the control air deflector, make molten metal wall Quench crystalline growth within it when flowing through air deflector, and utilize the motion of molten metal itself, make the thin brilliant necking down that produces of Quench, fracture or broken, and then washed away fracture by liquid stream and incorporate liquid stream, thereby form the semi solid slurry of liquid-solid coexistence;
Two of preferred version of the present invention is to improve crystalline rate by the pressure cooling to air deflector; Perhaps air deflector is applied vibration, improve thin brilliant the dissociating, rupture and propagation of Quench;
Three of preferred version of the present invention is when the air deflector outer wall is forced cooling, also by air deflector is applied vibration, improving the free, broken of solidification layer and dendritic arm, thereby improves productive rate and improves the semi solid slurry quality.
Among the present invention, by precooling, preheating, or the mode of adorning temperature controller outward places the air deflector temperature numerical value that is lower than alloy liquid phase line temperature.
Casting proposed by the invention with the preparation process of semi solid slurry is:
The first step places room temperature with air deflector;
Second step placed the crucible heating to form molten metal alloy, to opening the valve of air deflector porch behind the molten metal thermal insulation, molten metal was flowed to casting mold along air deflector.Metal liquid stream in crystallization on the air deflector wall rapidly under the chilling action of air deflector, and is that core radially is comparatively flourishing dendrite to the air deflector growth inside with the Quench crystalline substance when air deflector.The solid phase branch arm that forms is the cataclasm liquid stream that enters under the souring of liquid stream, and in the effect lower part remelting of air deflector center over-heat metal liquid and further division, its pattern transforms to the semisolid spherocrystal, forms the more nuclear core of giving birth to, and paste composition and two-phase is distributed obtain homogenizing.
The 3rd step is with semi solid slurry injection casting mold for preparing and the solidification forming of finishing part.
The invention allows for a kind of device that is used to prepare semi solid slurry.This device comprises crucible and high heat conduction air deflector, and wherein, crucible bottom has flow-guiding mouth, and air deflector uses metal or ceramic material, and its structure is pipe or groove structure.Air deflector one end is fixedly connected on the flow-guiding mouth, and on flow-guiding mouth, a switching control pilot door is installed; The other end of air deflector docks with casting mold as the outlet of molten metal.For realizing preferred version one of the present invention, on air deflector, be installed with temperature controller, and form good thermo-contact between this temperature controller and the air deflector, with control air deflector temperature; For realizing preferred version two of the present invention, install temperature controller additional at the air deflector outer wall air deflector is forced cooling, to improve crystalline rate; Perhaps on the air deflector outer wall, install vibration generator additional, air deflector is applied vibration, to improve thin brilliant the dissociating, rupture and propagation of Quench; For realizing preferred version three of the present invention, when the air deflector outer wall installs temperature controller additional, also install vibration generator additional at the air deflector outer wall, with when forcing cooling, also the mode by vibration improves the free, broken of solidification layer and dendritic arm.
Because the technical solution used in the present invention can form Quench crystals growth layer when molten metal is flowed through air deflector under given conditions on tube wall.Molten metal can cause dendritic arm fusing or fracture, the fragmentation that generates and enter liquid stream forming discrete free crystal grain to washing away of dendrite, and produces slaking in the mobile free process with metal bath, and causes interface topography to the spherocrystal convergence; By air deflector being forced cooling, can change near the temperature field of water conservancy diversion wall and distribute, improve the crystal grain cultivation effect, make the Quench dendritic growth more flourishing simultaneously, occur tangible solute enrichment between dendritic arm and necking occurs, be easier to wash away fracture down at liquid stream; By air deflector is applied vibration, help to improve the fracture rate and the division rate of solid phase and dendritic arm, improve the heat transfer boundary condition between molten metal and water conservancy diversion wall, dendrite is more flourishing, makes the solid phase particle disperse distribution more galore in the slurry, promotes its maturing process.Therefore, the technical solution used in the present invention can be produced high-quality semi solid slurry more efficiently, has that cost is low, preparation technology is simple, solidified structure foundry goods is tiny evenly, the characteristics of good mechanical property.
(4) description of drawings
Accompanying drawing 1 is the structural representation of semi solid slurry preparation facilities;
Accompanying drawing 2 is structural representations that the semi solid slurry preparation facilities of temperature controller is arranged;
Accompanying drawing 3 is structural representations that the semi solid slurry preparation facilities of vibration generator is arranged;
Accompanying drawing 4 is the structural representations that add the semi solid slurry preparation facilities of temperature controller and vibration generator simultaneously.
Wherein:
1. casting mold 2. air deflectors 3. crucibles 4. molten metals 5. valves
6. temperature controller 7. vibration generators 8. air inlet pipe
(5) specific embodiment
Below in conjunction with accompanying drawing device used in the present invention is described.
Embodiment one:
Present embodiment is the preparation aluminium alloy semi-solid slurry, and applied alloy designations is ZL101.
Present embodiment adopts the thermal capacitance of directly utilizing air deflector to the mode that molten metal cools off, and is applicable to the generation of a small amount of semi solid slurry of single, can directly utilize the thermal capacitance of copper pipe that alloy liquid is carried out chilling action.
In the enforcement, molten metal after the fusing is introduced casting mold by the high heat conduction air deflector with cooling effect, the temperature of air deflector is controlled at below the liquidus temperature of alloy, making molten metal is the dendrite pattern at air deflector inwall crystalline growth, and enter liquid phase after being washed away fracture by liquid stream, form semi solid slurry.
The device (accompanying drawing 1) of implementing the method comprises molten metal thermal insulation crucible 3, air deflector 2 and casting mold 1.Wherein, air deflector 2 is the copper pipe of 1 centimetre of wall thickness, and an end is fixedly connected on the flow-guiding mouth that is positioned at insulation crucible 3 bottoms by screw thread, and in this air deflector 2 and the junction of insulation crucible 3 bottoms one switching control pilot door 5 is installed; The other end of air deflector 2 docks with casting mold 1 as the outlet of molten metal 4.Detailed process is:
The first step places room temperature with air deflector;
Second step placed crucible 3 to be heated to 750 ℃ to form molten metal 4 alloy, and its liquid level is adjusted into 5 centimetres, and the valve 5 of air deflector 2 porch is opened in 4 insulations after 30 minutes to molten metal; Molten metal 4 flows to casting mold 1 in the flowing velocity of gravity effect lower edge air deflector 2 with 0.03 ± 0.01m/s.
When molten metal 4 is flowed through air deflector 2, in rapidly crystallization and be that core radially is comparatively flourishing dendrite to air deflector 2 growth inside on air deflector 2 walls under the chilling action of air deflector 2 with the Quench crystalline substance.The solid phase branch arm that forms is the cataclasm liquid stream that enters under the souring of liquid stream, and in the effect lower part remelting of air deflector 2 center over-heat metal liquid and further division, its pattern transforms to the semisolid spherocrystal, forms the more nuclear core of giving birth to, and paste composition and two-phase is distributed obtain homogenizing.The semi solid slurry for preparing injects casting mold 1 and finishes the solidification forming of part.
Embodiment two:
Present embodiment is the preparation magnesium alloy semisolid slurry, and applied alloy designations is ZM5.
Present embodiment adopts at the air deflector outer wall and installs the mode that temperature controller is forced cooling to air deflector additional, is applicable to the generation of semi solid slurry in enormous quantities.
In the enforcement, molten metal after the fusing is introduced casting mold by the high heat conduction air deflector with cooling effect, and by being installed at the temperature controller on the air deflector outer wall, the molten metal that is attached on the air deflector inwall is forced cooling, make molten metal be flourishing dendrite pattern at air deflector inwall crystalline growth, and enter liquid phase after being washed away fracture by liquid stream, form semi solid slurry.
The device (accompanying drawing 2) of implementing the method comprises molten metal thermal insulation crucible 3, air deflector 2, temperature controller 6 and casting mold 1, wherein, flow-guiding mouth is arranged at the bottom of insulation crucible 3, air deflector 2 is a thin wall of cast iron groove structure, one end is bolted to connection on the flow-guiding mouth that is positioned at insulation crucible 3 bottoms, and in this air deflector and the junction of insulation crucible 3 bottoms one switching control pilot door 5 is installed; The other end of air deflector docks with casting mold 1 as the outlet of molten metal; Temperature controller 6 is by being bolted on the air deflector 2, and inside is provided with the temperature of coolant flow passages with control air deflector 2, in the present embodiment, implements cooling by recirculated water.Detailed process is:
The first step places insulation crucible 3 to be heated to 720 ℃ to form molten metal 4 the ZM5 alloy, starts the recirculated water of temperature controller 6 simultaneously, and air deflector 2 is cooled off, and its temperature is controlled at 60 ± 10 ℃;
Second step, adjust the molten metal liquid level and be adjusted into 12 centimetres, molten metal thermal insulation is opened the valve 5 of air deflector 2 porch after 20 minutes, molten metal 4 speed with 0.1 ± 0.02m/s under the gravity effect is flowed to casting mold 1 along air deflector 2.
When molten metal 4 is flowed through air deflector 2, in rapidly crystallization and be that core radially is comparatively flourishing dendrite to air deflector 2 growth inside on air deflector 2 walls under the chilling action of air deflector 2 with the Quench crystalline substance.The solid phase branch arm that forms is cataclasm under the souring of liquid stream, liquid stream wash away and effect that central metal liquid is overheated under solid phase fragment partial remelting and further division, its pattern transforms to the semisolid spherocrystal, form the more nuclear core of giving birth to, paste composition and two-phase are distributed obtain homogenizing.The solid phase of the air deflector 2 inwalls back molten metal 4 that comes off directly contacts with wall, helps molten metal continuation crystallization and growing on wall, and this has also improved the generation efficient of semi solid slurry.The semi solid slurry for preparing injects casting mold 1 and finishes the solidification forming of part.
Embodiment three:
Present embodiment is the preparation magnesium alloy semisolid slurry, and applied alloy designations is AZ91.
Present embodiment adopts and installs the mode of device of excitation to the air deflector forced vibration additional at the air deflector outer wall, is applicable to the generation of small lot high-quality semi solid slurry.
In the enforcement, molten metal after the fusing is introduced casting mold by the high heat conduction air deflector with cooling effect, the temperature of air deflector is controlled at below the liquidus temperature of alloy, and making molten metal is the dendrite pattern at air deflector inwall crystalline growth, and enters liquid phase after being washed away fracture by liquid stream.By being installed at the device of excitation on the air deflector outer wall, to being attached to the solid metallic forced vibration on the air deflector inwall, the solid phase that the air deflector inwall is adhered to is cracked, the solid phase particles in the while refined pulp, thus obtain high-quality semi solid slurry.
The device (accompanying drawing 3) of implementing the method comprises molten metal thermal insulation crucible 3, air deflector 2, vibration generator 7 and casting mold 1, wherein, flow-guiding mouth is arranged at the bottom of insulation crucible 3, air deflector 2 is the copper circular tube structure of 1.8 centimetres of wall thickness, one end is fixedly connected on the air deflector 2 that is positioned at insulation crucible 3 bottoms by screw thread, and in this air deflector 2 and the junction of insulation crucible 3 bottoms one switching control pilot door 5 is installed; The other end of air deflector 2 docks with casting mold 1 as the outlet of molten metal 4; Vibration generator 7 is by being bolted on the air deflector 2.
In the present embodiment, the vibration of vibration generator 7 realizes that by centering type motor oscillating device employed motor is 200W, and motor shaft drives eccentric wheel and rotates the mechanical oscillation that form 5Hz with the speed rotation that per minute 300 changes; Operating frequency is simultaneously, and insulation crucible 3 is for being equipped with the hermetically-sealed construction of air inlet pipe 8, and the method that forms inside and outside differential pressure by the air inlet pressurization is controlled the flowing velocity of molten metal 4 in air deflector 2.Detailed process is:
The first step places crucible 3 to be heated to 700 ℃ with formation molten metal 4 alloy, and air deflector is placed room temperature;
Second step, the valve 5 of air deflector 2 porch is opened in molten metal 4 insulations after 30 minutes, in the sealing crucible, charge into gas, molten metal 4 is flowed to casting mold 1 in the speed of the differential pressure action lower edge of 1KPa air deflector 2 with 0.8 ± 0.2m/s, start the power supply of vibration generator 7 simultaneously, air deflector 2 is carried out forced vibration, and vibrator 7 operating frequencies are foregoing 5Hz.
When molten metal 4 is flowed through air deflector 2, in crystallization and be that core is a dendrite to air deflector 2 growth inside radially on air deflector 2 walls rapidly under the chilling action of air deflector 2 with the Quench crystalline substance.The solid phase branch arm that forms is the cataclasm liquid stream that enters under the souring of liquid stream, and the mechanical oscillation of vibration generator 7 generations simultaneously act on the solid phase that inwall adheres to by air deflector 2, make its cracked metal liquid stream that enters.Liquid stream wash away and effect that central metal liquid is overheated under solid phase fragment partial remelting and further division, its pattern transforms to the semisolid spherocrystal, forms the more nuclear core of giving birth to, and paste composition and two-phase is distributed obtain homogenizing.The solid phase of the air deflector 2 inwalls back molten metal 4 that comes off directly contacts with wall, help molten metal 2 continuation on wall crystalline growth and continue to come off, propagation, slaking, thereby improved the production efficiency and the quality of semi solid slurry.The semi solid slurry for preparing injects casting mold 1 and finishes the solidification forming of part.
Embodiment four:
Present embodiment is the preparation aluminium alloy semi-solid slurry, and applied alloy designations is ZL114.
Present embodiment adopts at the air deflector outer wall and installs temperature controller and the device of excitation mode that pressure is cooled off and vibrated to air deflector simultaneously additional, is applicable to the generation of high-quality semi solid slurry in enormous quantities.
In the enforcement, with the molten metal after the fusing to introduce casting mold by high heat conduction air deflector with cooling effect, the temperature of air deflector is controlled at below the liquidus temperature of alloy, and making molten metal is the dendrite pattern at air deflector inwall crystalline growth, and enters liquid phase after being washed away fracture by liquid stream.By being installed at the device of excitation on the air deflector outer wall, to being attached to the solid metallic forced vibration on the air deflector inwall, the solid phase that the air deflector inwall is adhered to is cracked, the solid phase particles in the while refined pulp, thus obtain high-quality semi solid slurry.
The device (accompanying drawing 4) of implementing the method comprises molten metal thermal insulation crucible 3, air deflector 2, temperature controller 6, vibration generator 7 and casting mold 1, wherein, flow-guiding mouth is arranged at insulation crucible 3 bottoms, air deflector 2 is ceramic flume structure, one end is fixedly connected on the air deflector 2 that is positioned at insulation crucible 3 bottoms by screw thread, and in the air deflector 2 and the junction of insulation crucible 3 bottoms one switching control pilot door 5 is installed; The other end of air deflector 2 docks with casting mold 1 as the outlet of molten metal 4; Temperature controller 6 is by being bolted on the air deflector 2, and its inside is provided with the temperature of coolant flow passages with control air deflector 2; Vibration generator 7 is by being bolted on the air deflector 2.
In the present embodiment, temperature controller 6 uses silicone oil as cooling agent, and the air deflector temperature is controlled at 220 ± 20 ℃; The vibration of vibration generator 7 realizes that by a pneumatic vibrator with reference to the characteristic resonances characteristic of solidifying the solid-liquid phase region, selecting the pneumatic vibrator operating frequency is 250Hz; Simultaneously, insulation crucible 3 is for being equipped with the hermetically-sealed construction of air inlet pipe 8, and the method that forms inside and outside differential pressure by the air inlet pressurization is controlled the flowing velocity of molten metal 4 in air deflector 2.Detailed process is:
The first step places insulation crucible 3 to be heated to 740 ℃ to form molten metal 4 the ZL114 alloy;
Second step, the valve 5 of air deflector 2 porch is opened in molten metal 4 insulations after 30 minutes, in sealed crucible 3, charge into gas, molten metal 4 is flowed to casting mold 1 in the speed of the differential pressure action lower edge of 1.5KPa air deflector 2 with 0.2 ± 0.05m/s, start the power supply of temperature controller 6 and vibration generator 7 simultaneously, air deflector 2 is forced cooling and vibration.
When molten metal 4 is flowed through air deflector 2, in rapidly crystallization and be that core is the dendrite of prosperity to air deflector 2 growth inside radially on air deflector 2 walls under the chilling action of air deflector 2 with the Quench crystalline substance.The solid phase branch arm that forms is the cataclasm liquid stream that enters under the souring of liquid stream, and the mechanical oscillation of vibration generator 7 generations simultaneously act on the solid phase that inwall adheres to by air deflector 2, make its cracked metal liquid stream that enters.The washing away of liquid stream, central metal liquid is overheated and the effect of ultrasonic vibration under solid phase fragment partial remelting and further division, its pattern transforms to the semisolid spherocrystal, forms the more nuclear core of giving birth to, and paste composition and two-phase is distributed obtain homogenizing.The solid phase of the air deflector 2 inwalls back molten metal 4 that comes off directly contacts with wall, help molten metal 2 continuation on wall crystalline growth and continue to come off, propagation, slaking, thereby improved the production efficiency and the quality of semi solid slurry.The semi solid slurry for preparing injects casting mold 1 and finishes the solidification forming of part.
Embodiment five:
Present embodiment is the preparation aluminium alloy semi-solid slurry, and applied alloy designations is ZL101.
Present embodiment adopts at the air deflector outer wall and installs temperature controller and the device of excitation mode that pressure is cooled off and vibrated to air deflector simultaneously additional, is applicable to the generation of high-quality semi solid slurry in enormous quantities.
In the enforcement, with the molten metal after the fusing to introduce casting mold by high heat conduction air deflector with cooling effect, the temperature of air deflector is controlled at below the liquidus temperature of alloy, and making molten metal is the dendrite pattern at air deflector inwall crystalline growth, and enters liquid phase after being washed away fracture by liquid stream.By being installed at the device of excitation on the air deflector outer wall, to being attached to the solid metallic forced vibration on the air deflector inwall, the solid phase that the air deflector inwall is adhered to is cracked, the solid phase particles in the while refined pulp, thus obtain high-quality semi solid slurry.
The device (accompanying drawing 4) of implementing the method comprises molten metal thermal insulation crucible 3, air deflector 2, temperature controller 6, vibration generator 7 and casting mold 1, wherein, flow-guiding mouth is arranged at insulation crucible 3 bottoms, air deflector 2 is the copper circular tube structure, one end is fixedly connected on the air deflector 2 that is positioned at insulation crucible 3 bottoms by screw thread, and in the air deflector 2 and the junction of insulation crucible 3 bottoms one switching control pilot door 5 is installed; The other end of air deflector 2 docks with casting mold 1 as the outlet of molten metal 4; Temperature controller 6 is by being bolted on the air deflector 2, and its inside is provided with the temperature of coolant flow passages with control air deflector 2; Vibration generator 7 is by being bolted on the air deflector 2.
In the present embodiment, temperature controller 6 uses silicone oil as cooling agent, and the air deflector temperature is controlled at 180 ± 20 ℃; The vibration of vibration generator 7 realizes that by the supersonic generator of a 600W selecting the operating frequency of its vibration generator according to the natural vibration characteristic of metal itself is 50kHz; Simultaneously, insulation crucible 3 is for being equipped with the hermetically-sealed construction of air inlet pipe 8, and the method that forms inside and outside differential pressure by the air inlet pressurization is controlled the flowing velocity of molten metal 4 in air deflector 2.Detailed process is:
The first step places insulation crucible 3 to be heated to 750 ℃ to form molten metal 4 the ZL114 alloy;
Second step, the valve 5 of air deflector 2 porch is opened in molten metal 4 insulations after 30 minutes, in sealed crucible 3, charge into gas, molten metal 4 is flowed to casting mold 1 in the speed of the differential pressure action lower edge of 3KPa air deflector 2 with 0.6 ± 0.1m/s, start the power supply of temperature controller 6 and vibration generator 7 simultaneously, air deflector 2 is forced cooling and vibration.
When molten metal 4 is flowed through air deflector 2, in rapidly crystallization and be that core is the dendrite of prosperity to air deflector 2 growth inside radially on air deflector 2 walls under the chilling action of air deflector 2 with the Quench crystalline substance.The solid phase branch arm that forms is the cataclasm liquid stream that enters under the souring of liquid stream, and the mechanical oscillation of vibration generator 7 generations simultaneously act on the solid phase that inwall adheres to by air deflector 2, make its cracked metal liquid stream that enters.The washing away of liquid stream, central metal liquid is overheated and the effect of ultrasonic vibration under solid phase fragment partial remelting and further division, its pattern transforms to the semisolid spherocrystal, forms the more nuclear core of giving birth to, and paste composition and two-phase is distributed obtain homogenizing.The solid phase of the air deflector 2 inwalls back molten metal 4 that comes off directly contacts with wall, help molten metal 2 continuation on wall crystalline growth and continue to come off, propagation, slaking, thereby improved the production efficiency and the quality of semi solid slurry.The semi solid slurry for preparing injects casting mold 1 and finishes the solidification forming of part.
Claims (6)
1. cast the preparation method who uses semi solid slurry for one kind, adopt the method for rheocasting, it is characterized in that the molten metal after the fusing is introduced in the casting mold (1) by the high heat conduction air deflector (2) with cooling effect, and the temperature of air deflector (2) is controlled at below the liquidus temperature of alloy, method or employing Quench with Quench are obtained semi solid slurry with the method that vibration combines, and its detailed process is:
The first step places air deflector the temperature that is lower than the alloy liquid phase line;
Second step placed the crucible heating to form molten metal alloy, to opening the valve of air deflector porch behind the molten metal thermal insulation, molten metal is flowed to casting mold along air deflector, and form semi solid slurry in flowing;
The 3rd step is with semi solid slurry injection casting mold for preparing and the solidification forming of finishing part.
2. a kind of according to claim 1 preparation method who casts with semi solid slurry is characterized in that as one of preferred version of the present invention, adopts the mode that presets to control the temperature of air deflector.
3. a kind of according to claim 1 preparation method who casts with semi solid slurry, it is characterized in that as two of preferred version of the present invention, perhaps, perhaps air deflector is applied vibration, improve thin brilliant the dissociating, rupture and propagation of Quench by the raising crystalline rate is cooled off in the pressure of air deflector.
4. a kind of according to claim 1 preparation method who casts with semi solid slurry, it is characterized in that as three of preferred version of the present invention, when the air deflector outer wall is forced cooling, also by air deflector is applied vibration, to improve the free, broken of solidification layer and dendritic arm.
5. realize the described casting of claim 1 preparation method's of semi solid slurry device for one kind, comprise casting mold (1) and crucible (3), it is characterized in that also including air deflector (2), and an end of air deflector (2) is fixedly connected on the flow-guiding mouth that is positioned at crucible bottom, the other end docks with casting mold; When implementing preferred version two of the present invention, fixedly install temperature controller (6) additional at the outer wall of air deflector (2), perhaps on air deflector (2) outer wall, fixedly install vibration generator (7) additional; When implementing preferred version three of the present invention, when the outer wall of air deflector (2) fixedly installed temperature controller (6) additional, also the outer wall at air deflector (2) fixedly installed vibration generator (7) additional.
As preparation casting as described in the claim 5 with the device of semi solid slurry, it is characterized in that on flow-guiding mouth, installing switching control pilot door (5).
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| CN103691895A (en) * | 2013-12-18 | 2014-04-02 | 北京科技大学 | Method and device for manufacturing semi-solid metal by using serpentine vibration channel |
| CN103722139A (en) * | 2013-09-26 | 2014-04-16 | 河南科技大学 | Semi-solid slurrying device and composite board manufacturing device using semi-solid slurrying device |
| CN103949082A (en) * | 2014-04-25 | 2014-07-30 | 涂海军 | Double-cooling flowing crystallization device |
| CN106475531A (en) * | 2015-09-01 | 2017-03-08 | 通用汽车环球科技运作有限责任公司 | The degassing of shape casting aluminium alloy and microstructure refinement |
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| CN107186181A (en) * | 2017-05-23 | 2017-09-22 | 广东工业大学 | A kind of device and method for preparing semi solid slurry |
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| CN103722139A (en) * | 2013-09-26 | 2014-04-16 | 河南科技大学 | Semi-solid slurrying device and composite board manufacturing device using semi-solid slurrying device |
| CN103537483A (en) * | 2013-10-16 | 2014-01-29 | 河南科技大学 | Method for manufacturing copper and aluminum composite strips and composite strip continuous casting device |
| CN103537483B (en) * | 2013-10-16 | 2016-02-03 | 河南科技大学 | A kind of preparation method of Copper-Aluminum compound strip and complex plate strip casting apparatus |
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| CN103691895A (en) * | 2013-12-18 | 2014-04-02 | 北京科技大学 | Method and device for manufacturing semi-solid metal by using serpentine vibration channel |
| CN103639375A (en) * | 2013-12-18 | 2014-03-19 | 北京科技大学 | Vibrating vertical straight-tube channel method and device for preparing semi-solid metal |
| CN103691895B (en) * | 2013-12-18 | 2016-05-11 | 北京科技大学 | A kind of vibration serpentine channel preparation method and device of semi-solid-state metal |
| CN103639374A (en) * | 2013-12-18 | 2014-03-19 | 北京科技大学 | Vibrating inverted-cone-shaped channel method and device for preparing semi-solid metal |
| CN103949082A (en) * | 2014-04-25 | 2014-07-30 | 涂海军 | Double-cooling flowing crystallization device |
| CN106475531A (en) * | 2015-09-01 | 2017-03-08 | 通用汽车环球科技运作有限责任公司 | The degassing of shape casting aluminium alloy and microstructure refinement |
| CN107214311A (en) * | 2016-03-22 | 2017-09-29 | 焦作市合鑫机械有限公司 | A kind of vibrating crystallizer |
| CN106825483A (en) * | 2017-03-21 | 2017-06-13 | 昆明理工大学 | A kind of method and device for preparing semi solid slurry |
| CN107186181A (en) * | 2017-05-23 | 2017-09-22 | 广东工业大学 | A kind of device and method for preparing semi solid slurry |
| CN111375748A (en) * | 2018-12-28 | 2020-07-07 | 井冈山大学 | Vibration slope casting device |
| CN109454216A (en) * | 2019-01-02 | 2019-03-12 | 宁波生久柜锁有限公司 | A kind of molten metal conveying device of semi-solid-state metal die casting equipment |
| CN113579203A (en) * | 2021-06-08 | 2021-11-02 | 苏州明志科技股份有限公司 | Micro-solid forming process and device |
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