CN110625083B - Device and method for preparing aluminum alloy semi-solid slurry - Google Patents
Device and method for preparing aluminum alloy semi-solid slurry Download PDFInfo
- Publication number
- CN110625083B CN110625083B CN201910928050.9A CN201910928050A CN110625083B CN 110625083 B CN110625083 B CN 110625083B CN 201910928050 A CN201910928050 A CN 201910928050A CN 110625083 B CN110625083 B CN 110625083B
- Authority
- CN
- China
- Prior art keywords
- ultrasonic
- electromagnetic
- aluminum alloy
- pulping chamber
- electromagnetic stirrer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000002002 slurry Substances 0.000 title claims abstract description 36
- 239000007787 solid Substances 0.000 title claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 61
- 238000004537 pulping Methods 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 68
- 239000000956 alloy Substances 0.000 claims description 68
- 239000007788 liquid Substances 0.000 claims description 68
- 238000002844 melting Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 13
- 239000000523 sample Substances 0.000 claims description 12
- 238000009210 therapy by ultrasound Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 230000005672 electromagnetic field Effects 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000013329 compounding Methods 0.000 abstract description 2
- 230000006911 nucleation Effects 0.000 description 19
- 238000010899 nucleation Methods 0.000 description 19
- 230000009471 action Effects 0.000 description 12
- 239000000155 melt Substances 0.000 description 11
- 238000005266 casting Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000004262 dental pulp cavity Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
Abstract
The invention provides a device and a method for preparing aluminum alloy semi-solid slurry, wherein the device comprises a control cabinet, a first electromagnetic stirrer, a second electromagnetic stirrer, a thermocouple, an ultrasonic mechanism, a pulping chamber, a base and a bracket; the ultrasonic mechanism is connected to the bracket, and the bracket is connected to the base; the ultrasonic mechanism comprises an amplitude transformer, a transducer and an ultrasonic tool head, and two ends of the amplitude transformer are respectively connected with the transducer and the ultrasonic tool head; the pulping chamber is arranged below the ultrasonic tool head; the first electromagnetic stirrer surrounds the pulping chamber, and the second electromagnetic stirrer is positioned below the pulping chamber; the control cabinet is connected with the first electromagnetic stirrer, the second electromagnetic stirrer, the resistance wire, the thermocouple and the ultrasonic mechanism; one end of the thermocouple is arranged in the pulping chamber. The device applies the ultrasonic field and the electromagnetic field to the single aluminum alloy semi-solid slurry preparation device in a compounding and cooperative way, and can finish the ultrasonic and electromagnetic stirring process simultaneously only by one operation procedure.
Description
Technical Field
The invention relates to the field of semi-solid metal processing, in particular to a device and a method for preparing aluminum alloy semi-solid slurry.
Background
The aluminum alloy has the advantages of high strength, low density, high corrosion resistance and the like, and is widely applied to various industrial departments such as aviation, automobiles, shipbuilding, construction, chemical industry, machinery and the like.
In order to obtain high-strength aluminum alloy castings with better mechanical properties, particularly better plasticity and toughness, the prior art mainly focuses on controlling the solidification and transmission behaviors of a high-strength aluminum alloy semi-solid slurry melt, and particularly adopts various different schemes to improve the refinement and spheroidization degree of slurry structures so as to improve the performance of the aluminum alloy. The existing method for improving the tissue refinement and spheroidization degree of the aluminum alloy mainly comprises the following steps:
(1) And a refiner is added into the metal melt, so that the nucleation rate of the melt is increased, and a finer semi-solid structure can be obtained by controlling the heat preservation condition. But the tissue uniformity of the bulk slurry is poor.
(2) The process for obtaining the non-dendritic semi-solid structure by acting the external force field on the solidification process of the alloy melt has low production cost and high efficiency, and the external force field changes the structure form and is divided into two modes of mechanical stirring and electromagnetic stirring.
To obtain finer, more spherical primary grains, it is necessary to increase the nucleation rate of the melt and increase the shear rate within the melt.
The melt can be strongly stirred by mechanical stirring methods such as twin screw stirring or rotating tube methods, providing high shear rates, but the method has problems in production such as easy corrosion of stirring equipment, easy contamination of slurry, uneven stirring, etc., which limits its application.
The electromagnetic stirring method is easy to operate because the electromagnetic stirring method does not pollute the melt, so the electromagnetic stirring method is a widely used preparation method of metal semi-solid slurry (blank). However, due to the electromagnetic skin effect, the electromagnetic stirring has the problems that the shearing rate of the edge part of the pulping chamber is high and the internal shearing rate is low, so that the semi-solid pulp structure is different from place to place in the radial direction of the pulping chamber, the semi-solid pulp structure is difficult to be uniform, and the non-uniformity is obvious when the size of the pulping chamber is large. The higher the frequency, the larger the diameter of the pulp chamber, and the larger the difference.
(3) The ultrasonic wave is introduced into molten metal as an external field, and has obvious effects of refining solidification structure, preventing segregation, removing impurities and gases, and the like. The thixotropic blank structure obtained by ultrasonic action has fine grains and higher grain rounding than that obtained by ordinary mechanical stirring. However, the ultrasonic sound pressure is attenuated sharply along with the distance from the end face of the ultrasonic head, the cavitation effect formed by ultrasonic vibration is formed only in a certain area near the ultrasonic head, and the distribution characteristic of the ultrasonic sound pressure also makes the range of action of sound flow generated by the sound pressure difference limited. When the volume of the melt is large, the crystal nucleus is difficult to distribute to the whole melt, and finally, the tissue at a position far away from the ultrasonic is difficult to refine.
The existing preparation device only comprises a method for improving the quality of the alloy liquid, and when a stirring method is adopted, the uniformity of the alloy liquid is good, but the generation amount of grain nucleation is insufficient. When the semi-solid slurry is prepared by adopting the ultrasound, a large number of crystal nuclei are formed in the ultrasonic cavity near the ultrasonic probe, but the part far away from the ultrasonic instrument is flat. Although the process of adding the refiner can refine grains, the composition of the aluminum alloy is changed, and the performance can be adversely affected. Therefore, the existing high-strength aluminum alloy semi-solid slurry structure control technology also lacks a device capable of compositely applying various physical processes, and is difficult to combine various excellent processes together with high efficiency.
Disclosure of Invention
The invention aims to solve the problem that a preparation device capable of organically combining a plurality of physical methods is lacked in aluminum alloy tissue refinement and spheroidization processing in the prior art, and provides a device and a method for preparing aluminum alloy semi-solid slurry in an ultrafine manner.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an apparatus for preparing semi-solid slurry of aluminum alloy, comprising the following structure: the device comprises a control cabinet 1, a first electromagnetic stirrer 10, a second electromagnetic stirrer 13, a thermocouple 6, an ultrasonic mechanism, a pulping chamber 4, a base 11 and a bracket 12; the ultrasonic mechanism is connected to the bracket 12, and the bracket 12 is connected to the base 11; the ultrasonic mechanism comprises an amplitude transformer 8, a transducer 7 and an ultrasonic tool head 9, and two ends of the amplitude transformer 8 are respectively connected with the transducer 7 and the ultrasonic tool head 9; the pulping chamber 4 is arranged below the ultrasonic tool head 9; the first electromagnetic stirrer 10 surrounds the pulping chamber 4, and the second electromagnetic stirrer 13 is positioned below the pulping chamber 4; the control cabinet 1 is connected with a first electromagnetic stirrer 10, a second electromagnetic stirrer 13, a thermocouple 6 and an ultrasonic mechanism; one end of the thermocouple 6 is placed in the metal melt 5 in the pulping chamber 4.
Preferably, the upper edge of the pulping chamber 4 protrudes and is clamped on the upper part of the first electromagnetic stirrer 10; the container used in the pulping chamber 4 is a crucible. The pulping chamber 4 is clamped at the upper part of the first electromagnetic stirrer 10, the shell of the first electromagnetic stirrer 10 plays a supporting role, the strength of the shell can support the pulping chamber 4 and the aluminum alloy semi-solid slurry in the pulping chamber 4, so that the lower part of the pulping chamber 4 is suspended in the air, and the shell plays a protective role for the second electromagnetic stirrer 13. The crucible is a reaction vessel for melting and refining metal liquid, has the characteristics of high temperature resistance and good stability, is easy to obtain, has excellent mass transfer effects on resistance wire heating and electromagnetic stirring, and is an ideal alloy vessel for the ultrasonic-electromagnetic composite field device.
Preferably, the transducer 7 is an ultrasound transducer. The ultrasonic transducer converts high-frequency electric energy into mechanical vibration to form ultrasonic waves to act on the alloy liquid, and ultrasonic cavities are formed under the vibration of the high-frequency ultrasonic waves to promote a large amount of nucleation in the alloy liquid so as to improve the processing quality of the alloy liquid.
Preferably, the ultrasonic power of the ultrasonic transducer can be adjusted in the range of 0-1500W. The ultrasonic power can be adjusted, and the adjustment is carried out according to the nucleation requirement and the melt state of the alloy liquid, and when the nucleation rate is lower, the power is increased, so that the nucleation generation in the alloy liquid is rapidly increased. When the nucleation rate of the alloy liquid is higher and needs to be kept stable, the ultrasonic instrument is turned down or turned off, so that the power consumption is reduced.
Preferably, the first electromagnetic stirrer 10 and the second electromagnetic stirrer 13 are composed of an electromagnetic stirring coil 2 and a resistance wire 3, the electromagnetic stirring coil 2 and the resistance wire 3 are in concentric ring structures, and the electromagnetic stirring coil 2 is arranged on the periphery of the resistance wire 3. The resistance wire 3 mainly heats the alloy liquid in the pulping chamber 4, and the heat efficiency is higher and the heat loss is less when the alloy liquid is heated around the pulping chamber. The electromagnetic stirring coil 2 realizes the stirring action of alloy liquid through a variable frequency magnetic field, the electromagnetic stirring coil 2 is arranged around the pulping chamber 4, so that stronger stirring action can be generated, meanwhile, the electromagnetic stirring coil 2 is distributed on the outer side of the resistance wire 3, and the interference/damage action of heat generated by the resistance wire 3 on the electromagnetic stirring coil 2 can be reduced. The first electromagnetic stirrer 10 mainly makes the slurry flow in a circumferential rotation way, and the second electromagnetic stirrer 13 mainly promotes the slurry to flow up and down, and the melt is macroscopically stirred uniformly without dead angles through the cooperation of the two.
Preferably, the ultrasonic tool head 9 is an ultrasonic probe, and the ultrasonic tool head 9 is made of titanium alloy or niobium alloy. The ultrasonic mechanism controls the working position of the ultrasonic tool head 9 through the amplitude transformer 8, so that the ultrasonic tool head 9 can extend into alloy liquid, the ultrasonic radiation sound intensity is ensured to be uniform, the ultrasonic treatment effect is good, and the ultrasonic treatment device has good flexibility.
Preferably, the stand 12 adjusts the agitation position of the ultrasonic mechanism by means of a hydraulic lever. The support 12 has two shaft points and is also connected with the ultrasonic mechanism through a shaft, and the stirring position of the ultrasonic mechanism can be adjusted through a hydraulic rod during stirring, so that more sufficient stirring is ensured.
The invention also provides a method for preparing the aluminum alloy semi-solid slurry by adopting the device, which comprises the following specific steps:
1) Heating and melting aluminum alloy, and preserving heat for 10-60 minutes until the temperature of the alloy liquid is stable;
2) Pouring alloy liquid into a pulping chamber 4, and preserving heat; starting an electromagnetic composite field around the pulping chamber 4 to stir, and simultaneously starting ultrasonic setting to carry out ultrasonic treatment on alloy liquid from the middle part;
3) After the stirring is completed, the slurry is subjected to water quenching or poured into a pressing chamber for forming.
Preferably, in the process of heating and melting the aluminum alloy in the step 1), the aluminum alloy is heated to 5-20 ℃ above the melting point, so that the aluminum alloy is kept fully melted, has good fluidity, and does not generate local solidification interference in the transfer process.
Preferably, the electromagnetic stirring time and the ultrasonic treatment time in the step 2) are 0.5-20 minutes. The electromagnetic stirring mainly causes the alloy liquid to flow, causes the alloy liquid at the edge and the alloy liquid with the core formed by central ultrasonic to exchange in a convection way, ensures that the alloy liquid generally and uniformly contains a large amount of cores, and improves the quality by utilizing a large volume of semi-solid slurry. The electromagnetic stirring is performed by the alloy liquid overall nucleation rate and uniformity close to the optimal, if the alloy liquid overall nucleation rate and uniformity tend to be stable, the electromagnetic stirring time is prolonged, the property of the alloy liquid is not influenced, and only the energy consumption of the alloy liquid processing process is increased. In the stirring process, the temperature is controlled at the same time, and the solid phase rate is controlled to be 0-40%.
Preferably, during the ultrasonic treatment, the ultrasonic probe extends into the alloy liquid for 1-5cm. The ultrasonic power is attenuated rapidly along with the increase of the propagation distance, and the ultrasonic probe is extended into the alloy liquid, so that the ultrasonic efficiency of the alloy liquid can be increased, and the nucleation generation efficiency is improved. While avoiding severe fluctuations in the liquid level from entraining liquid level oxides into the melt.
The aluminum alloy semi-solid slurry preparation device can compound an ultrasonic field and an electromagnetic field in the same pulping chamber, so that molten alloy liquid is subjected to electromagnetic stirring action and ultrasonic action simultaneously, a large number of nucleation is formed under the action of ultrasonic waves, the nucleation forms convection exchange dispersion action through electromagnetic stirring, and finally the alloy liquid with uniform distribution and high nucleation rate is obtained. The device can effectively combine two different physical processing technologies into the same processing technology, overcomes the defect of a single technology method, combines the advantages of the two methods, and greatly improves the physical properties of the processed alloy. The casting can be processed to obtain a high-strength aluminum alloy casting with fine, uniform and compact solidification structure, has higher strength, plasticity and toughness, and can be suitable for casting production of various special parts.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention applies the ultrasonic field and the electromagnetic field to the single aluminum alloy slurry processing device in a compounding and synergistic way, avoids the problem of nonuniform structure in a large range, effectively improves the nucleation rate and refinement uniformity of the melt, greatly improves the alloy performance, far exceeds the material performance limit which can be achieved by the conventional processing method, and has great substantive significance in the field with special requirements on castings.
2. The ultrasonic field and the electromagnetic field are compositely and cooperatively applied to a single aluminum alloy processing device, and the ultrasonic and electromagnetic stirring process can be completed simultaneously only by one operation procedure.
3. The device can accurately control the distribution conditions of the electromagnetic field and the ultrasonic field, ensure that the performances of the electromagnetic stirring and the ultrasonic field effectively cooperate together, and avoid mutual interference and reduce the efficiency.
Drawings
FIG. 1 is a schematic diagram of an apparatus for preparing semi-solid slurry by ultrasonic-electromagnetic composite field action.
Fig. 2 is a cross-sectional view of an electromagnetic stirrer and a pulping chamber.
The marks in the figure: the device comprises a control cabinet 1, an electromagnetic stirring coil 2, a resistance wire 3, a pulping chamber 4, a metal melt 5, a thermocouple 6, a transducer 7, an amplitude transformer 8, an ultrasonic tool head 9, a first electromagnetic stirrer 10, a base 11, a support 12 and a second electromagnetic stirrer 13.
Detailed Description
The invention aims to compound an ultrasonic field and an electromagnetic field and is used for preparing large-volume high-quality semi-solid slurry. Because a single ultrasonic field or electromagnetic field in a general small-volume test can achieve the aim of improving the quality of alloy liquid, the formation of uniform spherical materials for large-volume alloy liquid is difficult to realize in the prior art. The pulping chamber with larger volume is adjusted and selected to ensure the pulping amount of the alloy liquid, so that the real combination of the electromagnetic field and the ultrasonic field is realized. Preferably, the diameter of the pulping chamber is 180mm, and the volume of the pulping chamber for melting alloy liquid is more than 2L. In order to ensure the quality of the prepared large-volume alloy liquid, the volume of the pulping chamber is controlled to be about 2.5-3.5L, so that the electromagnetic stirring and ultrasonic device achieves the optimal use efficiency.
After molten alloy liquid is added, the control cabinet detects the temperature of the alloy liquid through a thermocouple to carry out temperature regulation, and the temperature is kept stable. The frequency and time of the electromagnetic stirring and ultrasonic probe are set, so that the alloy liquid forms a large number of cores under the action of ultrasonic waves released by the ultrasonic tool head, and meanwhile, the alloy liquid is convectively dispersed into the alloy liquid at the edge of the crucible under the action of the electromagnetic stirring, so that the uniform alloy liquid with high nucleation rate is formed.
The present invention will be described in further detail with reference to examples and embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
The device for preparing the ultrasonic-electromagnetic composite field of the high-quality large-volume semi-solid slurry as shown in fig. 1-2 comprises the following structures: the device comprises a control cabinet 1, a first electromagnetic stirrer 10, a second electromagnetic stirrer 13, a thermocouple 6, an ultrasonic mechanism, a pulping chamber 4, a base 11 and a bracket 12; the ultrasonic mechanism is connected to the bracket 12, and the bracket 12 is connected to the base 11; the ultrasonic mechanism comprises an amplitude transformer 8, a transducer 7 and an ultrasonic tool head 9, and two ends of the amplitude transformer 8 are respectively connected with the transducer 7 and the ultrasonic tool head 9; the pulping chamber 4 is arranged below the ultrasonic tool head 9; the first electromagnetic stirrer 10 surrounds the pulping chamber 4, and the second electromagnetic stirrer 13 is positioned below the pulping chamber 4; the control cabinet 1 is connected with a first electromagnetic stirrer 10, a second stirrer 13, a thermocouple 6 and an ultrasonic mechanism; one end of the thermocouple 6 is placed in the metal melt 5 in the pulping chamber 4.
Further, the upper edge of the pulping chamber 4 protrudes and is clamped on the upper part of the first electromagnetic stirrer 10; the vessel used in the pulping chamber 4 is a crucible.
Further, the transducer 7 is an ultrasonic transducer.
Further, the ultrasonic power of the ultrasonic transducer can be adjusted, and the adjusting range is 0-1500W.
Further, the first electromagnetic stirrer 10 and the second electromagnetic stirrer 13 are composed of an electromagnetic stirring coil 2 and a resistance wire 3, the electromagnetic stirring coil 2 and the resistance wire 3 are in concentric ring structures, and the electromagnetic stirring coil 2 is arranged on the periphery of the resistance wire 3.
Further, the ultrasonic tool head 9 is an ultrasonic probe, and the ultrasonic tool head 9 is made of titanium alloy or niobium alloy.
Further, the stand 12 adjusts the stirring position of the ultrasonic mechanism by means of a hydraulic rod.
Further, the control cabinet 1 is used for controlling the working states and working time of the electromagnetic stirring ring 2, the ultrasonic mechanism and the resistance wire 3. The resistance wire 3 heats the alloy liquid in the crucible, keeps the temperature of the alloy liquid to rise, and after the heating is stopped, the alloy liquid in the crucible can be naturally cooled, or the crucible can be put into water for quenching.
The invention also provides a method for preparing aluminum alloy melt slurry by adopting the device, which comprises the following specific steps:
1) Heating and melting aluminum alloy, and preserving heat for 10-60 minutes until the temperature of the alloy liquid is stable;
2) Pouring alloy liquid into a pulping chamber 4, and preserving heat; starting an electromagnetic composite field around the pulping chamber 4 to stir, and simultaneously starting ultrasonic setting to carry out ultrasonic treatment on alloy liquid from the middle part;
3) After the stirring is completed, the slurry is subjected to water quenching or poured into a pressing chamber for forming.
Further, in the process of heating and melting the aluminum alloy in the step 1), the aluminum alloy is heated to 5-20 ℃ above the melting point, so that the aluminum alloy is kept fully melted, the aluminum alloy has good fluidity, and no local solidification interference is generated in the transfer process.
Further, the electromagnetic stirring time and the ultrasonic treatment time in the step 2) are 0.5-20 minutes. The electromagnetic stirring mainly causes the alloy liquid to flow, causes the alloy liquid at the edge and the alloy liquid of the core forming core generated by central ultrasonic to exchange in a convection way, ensures that the alloy liquid generally and uniformly contains a large number of core forming cores, and is beneficial to the quality improvement of large-volume semi-solid slurry. The electromagnetic stirring is performed by the alloy liquid overall nucleation rate and uniformity close to the optimal, if the alloy liquid overall nucleation rate and uniformity tend to be stable, the electromagnetic stirring time is prolonged, the property of the alloy liquid is not influenced, and only the energy consumption of the alloy liquid processing process is increased. In the stirring process, the temperature is controlled at the same time, and the solid phase rate is controlled to be 0-40%.
Further, in the ultrasonic treatment process, the ultrasonic probe extends into the alloy liquid for 1cm to 5cm. The ultrasonic power is attenuated rapidly along with the increase of the propagation distance, and the ultrasonic probe is extended into the alloy liquid, so that the ultrasonic efficiency of the alloy liquid can be increased, and the nucleation generation efficiency is improved. While avoiding severe fluctuations in the liquid level from entraining liquid level oxides into the melt.
Examples
Preparing semi-solid slurry of aluminum alloy: and (3) taking 6.8kg of 7A04 aluminum alloy, heating and melting, preserving heat for 5 minutes, transferring the alloy into a crucible after the alloy liquid temperature is stable, controlling resistance wire heating through a control cabinet, and keeping the alloy liquid temperature higher than the melting point by 10 ℃. Simultaneously, the electromagnetic stirring rings around the pulping chamber are started through the control cabinet, so that electromagnetic stirring is realized, the electromagnetic stirring power is 400W, and the frequency is 20Hz. The ultrasonic device is started through the control cabinet, the ultrasonic probe is kept to extend into the alloy liquid surface for 1cm, and the ultrasonic probe is subjected to ultrasonic treatment with 800W power. And (3) electromagnetic stirring and ultrasonic time are 5 minutes, and after the completion, the slurry is poured into a pressing chamber for die casting and forming, so that the high-quality high-strength aluminum alloy is obtained.
The 7A04 aluminum alloy is super hard aluminum alloy, has special application in various fields and has better performance. The processing method of the semi-solid slurry of the aluminum alloy can greatly improve the quality of the 7A04 aluminum alloy, realize near net forming of castings with high strength and high toughness and complex shapes, and lead the physical properties of the castings to be more outstanding. And the method is expected to provide reliable material castings for high-performance complex parts in the key fields of aviation, aerospace, high-speed rail and the like.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any changes or substitutions that do not undergo the inventive effort should be construed as falling within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (4)
1. The device for preparing the aluminum alloy semi-solid slurry is characterized by comprising the following structures: the device comprises a control cabinet (1), a first electromagnetic stirrer (10), a second electromagnetic stirrer (13), a thermocouple (6), an ultrasonic mechanism, a pulping chamber (4), a base (11) and a bracket (12); the ultrasonic mechanism is connected to the bracket (12), and the bracket (12) is connected to the base (11); the ultrasonic mechanism comprises an amplitude transformer (8), a transducer (7) and an ultrasonic tool head (9), and two ends of the amplitude transformer (8) are respectively connected with the transducer (7) and the ultrasonic tool head (9); the pulping chamber (4) is arranged below the ultrasonic tool head (9); the first electromagnetic stirrer (10) surrounds the pulping chamber (4), and the second electromagnetic stirrer (13) is positioned below the pulping chamber (4); the control cabinet (1) is connected with the first electromagnetic stirrer (10), the second electromagnetic stirrer (13), the thermocouple (6) and the ultrasonic mechanism; one end of the thermocouple (6) is arranged in the metal melt (5) in the pulping chamber (4);
the upper edge of the pulping chamber (4) protrudes and is clamped at the upper part of the first electromagnetic stirrer (10); the container used in the pulping chamber (4) is a crucible;
the transducer (7) is an ultrasound transducer;
the ultrasonic power adjusting range of the ultrasonic transducer is 0-1500W;
the first electromagnetic stirrer (10) and the second electromagnetic stirrer (13) are composed of an electromagnetic stirring coil (2) and a resistance wire (3), the electromagnetic stirring coil (2) and the resistance wire (3) are of concentric ring structures, and the electromagnetic stirring coil (2) is arranged on the periphery of the resistance wire (3);
the ultrasonic tool head (9) is an ultrasonic probe, and the ultrasonic tool head (9) is made of titanium alloy or niobium alloy;
the stirring position of the ultrasonic mechanism is adjusted by the bracket (12) through a hydraulic rod.
2. A method for preparing aluminum alloy semi-solid slurry by using the device as claimed in claim 1, which is characterized by comprising the following specific steps:
1) Heating and melting aluminum alloy, and preserving heat for 10-60 minutes until the temperature of the alloy liquid is stable;
2) Pouring alloy liquid into a pulping chamber (4), and preserving heat; starting an electromagnetic composite field around the pulping chamber (4) to stir, and simultaneously starting ultrasonic setting to carry out ultrasonic treatment on alloy liquid from the middle part;
3) After the stirring is completed, the slurry is subjected to water quenching or poured into a pressing chamber for forming.
3. The method for preparing an aluminum alloy semi-solid slurry according to claim 2, wherein in the process of heating and melting the aluminum alloy in step 1), the aluminum alloy is heated to 5-20 ℃ above the melting point.
4. The method for preparing an aluminum alloy semi-solid slurry according to claim 2, wherein the electromagnetic stirring time and the ultrasonic treatment time in the step 2) are 0.5-20 minutes, and the ultrasonic probe is extended into the alloy liquid for 1-5cm during the ultrasonic treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910928050.9A CN110625083B (en) | 2019-09-27 | 2019-09-27 | Device and method for preparing aluminum alloy semi-solid slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910928050.9A CN110625083B (en) | 2019-09-27 | 2019-09-27 | Device and method for preparing aluminum alloy semi-solid slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110625083A CN110625083A (en) | 2019-12-31 |
| CN110625083B true CN110625083B (en) | 2024-01-30 |
Family
ID=68974654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910928050.9A Active CN110625083B (en) | 2019-09-27 | 2019-09-27 | Device and method for preparing aluminum alloy semi-solid slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110625083B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111849399A (en) * | 2020-06-16 | 2020-10-30 | 廖铁仙 | Heat dissipation composition of semiconductor device and preparation method thereof |
| CN112404371B (en) * | 2020-11-19 | 2022-05-06 | 西安交通大学 | Aluminum alloy wheel hub semisolid rheoforming slurry preparation and transfer device |
| CN114150170B (en) * | 2021-11-30 | 2022-10-14 | 大连交通大学 | Stirring device, stirring method and application for preparing aluminum alloy semi-solid composite slurry |
| CN114262801A (en) * | 2021-12-24 | 2022-04-01 | 大连交通大学 | Non-ferrous metal vacuum purification and semi-solid slurry forming device and purification method thereof |
| CN114850418A (en) * | 2022-05-31 | 2022-08-05 | 福州大学 | Semi-solid slurry preparation process and device capable of realizing multilayer stirring |
| CN115558811B (en) * | 2022-09-10 | 2023-06-16 | 哈尔滨工业大学 | Equipment and method for preparing TiAl semi-solid material by utilizing ultrasonic and electromagnetic field |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6432160B1 (en) * | 2000-06-01 | 2002-08-13 | Aemp Corporation | Method and apparatus for making a thixotropic metal slurry |
| KR100662041B1 (en) * | 2006-05-26 | 2006-12-27 | 주식회사 퓨쳐캐스트 | Hot chamber die casting apparatus for semi-solid magnesium alloy and the manufacturing method using the same |
| CN101391290A (en) * | 2008-11-05 | 2009-03-25 | 江苏大学 | Method for synthesizing metal matrix composition using metal reaction under the coupling action of magnetic field and ultrasonic field |
| CN101708543A (en) * | 2009-04-22 | 2010-05-19 | 华中科技大学 | Method and device for preparing semisolid metal slurry by mixing vibration |
| CN102189103A (en) * | 2011-03-01 | 2011-09-21 | 大连理工大学 | Light alloy electromagnetic ultrasonic casting and rolling integration device and method |
| CN202116631U (en) * | 2011-06-16 | 2012-01-18 | 北京有色金属研究总院 | Device for preparing semi-solid alloy rheological slurry or blank |
| CN210730934U (en) * | 2019-09-27 | 2020-06-12 | 西南交通大学 | Device for preparing aluminum alloy semi-solid slurry |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6796362B2 (en) * | 2000-06-01 | 2004-09-28 | Brunswick Corporation | Apparatus for producing a metallic slurry material for use in semi-solid forming of shaped parts |
-
2019
- 2019-09-27 CN CN201910928050.9A patent/CN110625083B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6432160B1 (en) * | 2000-06-01 | 2002-08-13 | Aemp Corporation | Method and apparatus for making a thixotropic metal slurry |
| KR100662041B1 (en) * | 2006-05-26 | 2006-12-27 | 주식회사 퓨쳐캐스트 | Hot chamber die casting apparatus for semi-solid magnesium alloy and the manufacturing method using the same |
| CN101391290A (en) * | 2008-11-05 | 2009-03-25 | 江苏大学 | Method for synthesizing metal matrix composition using metal reaction under the coupling action of magnetic field and ultrasonic field |
| CN101708543A (en) * | 2009-04-22 | 2010-05-19 | 华中科技大学 | Method and device for preparing semisolid metal slurry by mixing vibration |
| CN102189103A (en) * | 2011-03-01 | 2011-09-21 | 大连理工大学 | Light alloy electromagnetic ultrasonic casting and rolling integration device and method |
| CN202116631U (en) * | 2011-06-16 | 2012-01-18 | 北京有色金属研究总院 | Device for preparing semi-solid alloy rheological slurry or blank |
| CN210730934U (en) * | 2019-09-27 | 2020-06-12 | 西南交通大学 | Device for preparing aluminum alloy semi-solid slurry |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110625083A (en) | 2019-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110625083B (en) | Device and method for preparing aluminum alloy semi-solid slurry | |
| JP3549055B2 (en) | Die casting method for metal material molding in solid-liquid coexistence state, apparatus therefor, die casting method for semi-solid molding and apparatus therefor | |
| CN103586431B (en) | A kind of method introducing ultrasonic field casting and roll process production CTP version base stock | |
| CN104726726B (en) | A kind of alloy semi-solid slurry preparation method | |
| CN102108455A (en) | Preparation method of aluminum-base composite material | |
| CN107457382B (en) | Semi-solid rheologic die casting apparatus for producing | |
| CN210730934U (en) | Device for preparing aluminum alloy semi-solid slurry | |
| CN101745629A (en) | Method for preparing semi-solid alloy rheological slurry or billet through annular-gap type electromagnetic stirring | |
| CN105772663A (en) | Device and method for preparing homogeneous ingots through coupling stirring technology | |
| CN109971980A (en) | The method for improving CrCoNi medium entropy alloy mechanical property using magnetic field | |
| CN107447163A (en) | The apparatus and method that industry casts live ultrasonication molten iron | |
| CN106475538B (en) | A kind of ultrasonic electromagnetic continuous casing of steel alloy | |
| CN102357654B (en) | Method and device for directionally solidifying liquid/solid interface based on ultrasonic wave modulation | |
| JP2004114153A (en) | Method and apparatus for producing metallic material in solid-liquid coexisting state and method and apparatus for producing semi-solidified metallic slurry | |
| KR20050079106A (en) | Forming apparatus for rheoforming method | |
| KR100436118B1 (en) | Apparatus for producing a semi-solid metallic slurry | |
| CN103162550B (en) | A kind for the treatment of apparatus and method of casting use metal bath | |
| KR200320004Y1 (en) | Apparatus for producing a semi-solid metallic slurry | |
| CN105234356B (en) | Preparation method for aluminum alloy semi-solid slurry induced and impregnated by modificator | |
| KR100436116B1 (en) | Manufacturing apparatus of billet for thixocasting method | |
| KR20130041473A (en) | Manufacturing method of high pressure rheocasting and apparatus thereof | |
| CN115558811B (en) | Equipment and method for preparing TiAl semi-solid material by utilizing ultrasonic and electromagnetic field | |
| CN114875257B (en) | High-frequency induction heating solidification device and method for preparing high-temperature alloy | |
| CN207276685U (en) | The device of the live ultrasonication molten iron of industry casting | |
| TWI414610B (en) | Method for making aluminium-based metal matrix composites |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |