CN210730934U - Device for preparing aluminum alloy semi-solid slurry - Google Patents
Device for preparing aluminum alloy semi-solid slurry Download PDFInfo
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- CN210730934U CN210730934U CN201921631184.6U CN201921631184U CN210730934U CN 210730934 U CN210730934 U CN 210730934U CN 201921631184 U CN201921631184 U CN 201921631184U CN 210730934 U CN210730934 U CN 210730934U
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- electromagnetic stirrer
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Abstract
The utility model discloses a device of preparation aluminum alloy semi-solid state thick liquids, including following structure: 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, an energy converter and an ultrasonic tool head, wherein two ends of the amplitude transformer are respectively connected with the energy converter and the ultrasonic tool head; the pulping chamber is arranged below the ultrasonic tool head; the first electromagnetic stirrer surrounds the periphery of 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 utility model discloses on being applied to single aluminium alloy semi-solid state thick liquids preparation facilities with the compound cooperation of ultrasonic field and electromagnetic field, only need once operation process can accomplish ultrasonic wave and electromagnetic stirring technology simultaneously.
Description
Technical Field
The utility model relates to a half solid-state metal processing field, in particular to device of half solid-state thick liquids of preparation aluminum alloy.
Background
Because of its advantages of high strength, low density and high corrosion resistance, aluminium alloy is widely used in aviation, automobile, shipbuilding, building, chemical engineering and mechanical industries.
In order to obtain a high-strength aluminum alloy casting 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 specifically adopts various schemes to improve the thinning and spheroidizing degrees of a slurry structure so as to improve the performance of an aluminum alloy. The existing method for improving the structure refinement and spheroidization degree of the aluminum alloy mainly comprises the following steps:
(1) adding a refiner into the metal melt to increase the nucleation rate of the melt, and controlling the heat preservation condition to obtain a fine semi-solid structure. But the texture uniformity of the bulk slurry is not good.
(2) The process for obtaining the non-dendritic crystal 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 and more spherical primary grains, it is necessary to increase the melt nucleation rate and increase the shear rate in the melt.
The melt can be intensively stirred by adopting a mechanical stirring method, such as a double-screw stirring method or a rotating tube method, so that high shear rate is provided, but the method has the problems that stirring instruments are easy to corrode, slurry is easy to pollute, the stirring is not uniform and the like in production, so that the application of the method is limited.
The electromagnetic stirring method is a commonly used method for preparing metal semi-solid slurry (blank) because the electromagnetic stirring method does not pollute the melt and is easy to operate. However, due to the electromagnetic skin effect, the electromagnetic stirring has the problems of high shearing rate at the edge part of the pulping chamber and low internal shearing rate, so that the tissues of the semi-solid slurry are different and difficult to be uniform at each position in the radial direction of the pulping chamber, and the nonuniformity is obvious when the size of the pulping chamber is large. The higher the frequency, the larger the diameter of the pulping chamber, the greater this difference.
(3) The ultrasonic wave is introduced into the molten metal as an external field, and has obvious effects of refining a solidification structure, preventing segregation, removing impurities, gas and the like. The thixotropic green structure obtained by the ultrasonic action is fine in grain size and higher in grain roundness than that obtained by ordinary mechanical stirring. However, the ultrasonic sound pressure is sharply attenuated along with the distance from the end face of the ultrasonic head, the cavitation effect formed by the ultrasonic vibration is only formed in a certain area near the ultrasonic head, and the distribution characteristic of the ultrasonic sound pressure also limits the action range of sound flow generated by the sound pressure difference. When the volume of the melt is large, the crystal nucleus is difficult to distribute to the whole melt, and finally, the tissue far away from the ultrasonic wave is difficult to be refined.
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 better, but the generation amount of crystal grain nucleation is insufficient. When the semi-solid slurry is prepared by using 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. The process of adding the refiner can refine grains, but changes the composition of the aluminum alloy at the same time, and may have some adverse effects on the performance. Therefore, the existing high-strength aluminum alloy semi-solid slurry structure control technology is still lack of a device capable of compositely applying various physical processes, and various excellent processes are difficult to combine together efficiently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the problem that the preparation device which can organically combine a plurality of physical methods is lacked in the process of thinning and spheroidizing the aluminum alloy tissue in the prior art, and provide a device for preparing aluminum alloy semi-solid slurry by superfine.
In order to achieve the above purpose, the technical scheme of the utility model is that:
an apparatus for preparing aluminum alloy semi-solid slurry, 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 support 12, and the support 12 is connected to the base 11; the ultrasonic mechanism comprises an amplitude transformer 8, an energy converter 7 and an ultrasonic tool head 9, wherein two ends of the amplitude transformer 8 are respectively connected with the energy converter 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 molten metal 5 in the slurrying 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 by the pulping chamber 4 is a crucible. The pulping chamber 4 is clamped on the upper part of the first electromagnetic stirrer 10, the shell of the first electromagnetic stirrer 10 plays a supporting role, the intensity of the shell can support the pulping chamber 4 and the aluminum alloy semisolid slurry in the pulping chamber 4, the lower part of the pulping chamber 4 is suspended, and the electromagnetic stirrer 10 is protected. The crucible is a reaction vessel for melting and refining the metal liquid, has the characteristics of high temperature resistance and good stability, is easy to obtain, and has excellent mass transfer effect on resistance wire heating and electromagnetic stirring, and is the ideal alloy vessel of the ultrasonic-electromagnetic composite field device.
Preferably, the transducer 7 is an ultrasonic 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 to be generated 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, and the adjustment range is 0-1500W. The ultrasonic power can be adjusted according to the nucleation requirement of the alloy liquid and the melt state, and when the nucleation rate is lower, the power is increased, and the nucleation generation in the alloy liquid is rapidly increased. When the liquid nucleation rate of the alloy is high and needs to be kept stable, the ultrasonic instrument is turned down or closed, and 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 a concentric ring structure, and the electromagnetic stirring coil 2 is arranged on the periphery of the resistance wire 3. The resistance wire 3 is mainly used for heating the alloy liquid in the pulping chamber 4, and has higher thermal efficiency and less heat loss when the alloy liquid is heated around the pulping chamber. Electromagnetic stirring coil 2 realizes the stirring effect of alloy liquid through the frequency conversion magnetic field, sets up electromagnetic stirring coil 2 around slurrying room 4, can produce more powerful stirring effect, distributes electromagnetic stirring coil 2 in the outside of resistance wire 3 simultaneously, can reduce the interference/the destruction effect of the heat that resistance wire 3 produced to electromagnetic stirring coil 2. The first electromagnetic stirrer 10 mainly makes the slurry generate circumferential rotation flow, and the second electromagnetic stirrer 13 mainly promotes the slurry to flow up and down, so that the melt is macroscopically stirred uniformly without dead angles through the cooperation of the first electromagnetic stirrer and the second electromagnetic stirrer.
Preferably, the ultrasonic tool head 9 is an ultrasonic probe, and the material of the ultrasonic tool head 9 is 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 the alloy liquid, the uniformity of ultrasonic radiation sound intensity is ensured, the ultrasonic treatment effect is good, and the flexibility is good.
Preferably, the bracket 12 adjusts the stirring position of the ultrasonic mechanism through a hydraulic rod. The support 12 is provided with two shaft points which are 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 utility model discloses an aluminum alloy semisolid slurry preparation facilities can make the alloy liquid after melting receive electromagnetic stirring effect and supersound effect simultaneously with the compound same pulping chamber of ultrasonic field and electromagnetic field, guarantees that alloy liquid forms a large amount of nucleation under ultrasonic effect, and these nucleation form convection current exchange dispersion through electromagnetic stirring again, finally obtain evenly distributed, the higher alloy liquid of nucleation rate. The utility model discloses a device can be simultaneously with the effectual compound to same processing technology of the physical processing technology of two kinds of differences, has overcome the defect of single processing method, combines the advantage of two kinds of methods for the very big promotion of physical properties of processing alloy. The high-strength aluminum alloy casting with fine, uniform and compact solidification structure can be processed, has higher strength, plasticity and toughness, and can be suitable for casting production of various special parts.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses on being applied to single aluminum alloy thick liquids processingequipment with the compound cooperation of ultrasonic field and electromagnetic field, avoided its tissue at inhomogeneous problem in on a large scale, the effectual nucleation rate that has improved the fuse-element with refine the degree of consistency for the alloy performance promotes by a wide margin, far exceeds the material performance limit that conventional processing method can reach, has significant substantive meaning to the field that the foundry goods has special requirements.
2. The utility model discloses on being applied to single aluminum alloy processingequipment with the compound cooperation of ultrasonic field and electromagnetic field, only need once operation process can accomplish ultrasonic wave and electromagnetic stirring technology simultaneously.
3. The utility model discloses the distribution condition of control electromagnetic field and ultrasonic field that the device can be accurate guarantees that the performance of electromagnetic stirring and ultrasonic field is effectively used in coordination and is in the same place, avoids mutual interference to reduce efficiency.
Drawings
FIG. 1 is a schematic diagram of an apparatus for preparing semi-solid slurry by the action of ultrasonic-electromagnetic composite field.
FIG. 2 is a cross-sectional view of the electromagnetic stirrer and the pulping chamber.
The labels in the figure are: 1-a control cabinet, 2-an electromagnetic stirring coil, 3-a resistance wire, 4-a pulping chamber, 5-a metal melt, 6-a thermocouple, 7-a transducer, 8-an amplitude transformer, 9-an ultrasonic tool head, 10-a first electromagnetic stirrer, 11-a base, 12-a bracket and 13-a second electromagnetic stirrer.
Detailed Description
The utility model aims to compound the ultrasonic field and the electromagnetic field and prepare large-volume high-quality semi-solid slurry. Because the purpose of improving the quality of the alloy liquid can be achieved by a single ultrasonic field or electromagnetic field in a general small-volume test, the formation of uniform spherical materials in the large-volume alloy liquid is difficult to realize by the prior art. The pulping amount of the alloy liquid is ensured by adjusting and selecting the pulping chamber with larger volume, and 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 the 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 the molten alloy liquid is added, the control cabinet detects the temperature of the alloy liquid through the thermocouple to adjust the temperature and keep the temperature stable. The frequency and time of the electromagnetic stirring and the 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 to form uniform alloy liquid with high nucleation rate.
The present invention will be described in further detail with reference to examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies 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 figures 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 support 12, and the support 12 is connected to the base 11; the ultrasonic mechanism comprises an amplitude transformer 8, an energy converter 7 and an ultrasonic tool head 9, wherein two ends of the amplitude transformer 8 are respectively connected with the energy converter 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 molten metal 5 in the slurrying chamber 4.
Furthermore, the upper edge of the pulping chamber 4 is protruded and clamped at the upper part of the first electromagnetic stirrer 10; the container 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 adjustment 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 of a concentric ring structure, 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 material of the ultrasonic tool head 9 is titanium alloy or niobium alloy.
Further, the bracket 12 adjusts the stirring position of the ultrasonic mechanism through a hydraulic rod.
Further, the control cabinet 1 is used for controlling the working state and the 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 rising, and the alloy liquid in the crucible can be naturally cooled after the heating is stopped, or the crucible can be put into water for quenching.
Examples
Preparing aluminum alloy semi-solid slurry: 6.8kg of 7A04 aluminum alloy is taken to be heated and melted, the temperature is kept for 5 minutes, the alloy liquid is transferred into a crucible after the temperature of the alloy liquid is stable, and a resistance wire is controlled by a control cabinet to heat the alloy liquid, so that the temperature of the alloy liquid is kept higher than the melting point by 10 ℃. Meanwhile, 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 20 Hz. And (3) starting the ultrasonic device through the control cabinet, keeping the ultrasonic probe extending into the alloy liquid level for 1cm, and carrying out ultrasonic treatment at the power of 800W. Electromagnetic stirring and ultrasonic treatment are carried out for 5 minutes, and the slurry is poured into a pressure chamber for die-casting forming to obtain the high-quality and high-strength aluminum alloy.
The 7A04 aluminum alloy is a super-hard aluminum alloy, has special application in many fields and has better performance. Through the utility model discloses a semi-solid slurry processing method of aluminum alloy can be very big the quality of improvement 7A04 aluminum alloy, realizes the near net shaping of high strength, high tenacity complex shape foundry goods, makes its physical properties more prominent. 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 above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the creative work should be covered 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 (7)
1. An apparatus for preparing aluminum alloy semi-solid slurry, characterized by 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 support (12), and the support (12) is connected to the base (11); the ultrasonic mechanism comprises an amplitude transformer (8), an energy transducer (7) and an ultrasonic tool head (9), wherein two ends of the amplitude transformer (8) are respectively connected with the energy 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).
2. An apparatus for preparing semi-solid slurry of aluminum alloy according to claim 1, wherein the upper edge of the slurrying chamber (4) is protruded and stuck to the upper part of the first electromagnetic stirrer (10); the container used by the pulping chamber (4) is a crucible.
3. An apparatus for preparing an aluminum alloy semi-solid slurry according to claim 1, wherein the transducer (7) is an ultrasonic transducer.
4. An apparatus for preparing semi-solid slurry of aluminum alloy according to claim 3, wherein the ultrasonic power of the ultrasonic transducer is adjustable within a range of 0-1500W.
5. An apparatus for preparing aluminum alloy semi-solid slurry according to claim 1, wherein 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 structure, and the electromagnetic stirring coil (2) is arranged at the periphery of the resistance wire (3).
6. An apparatus for preparing semi-solid slurry of aluminum alloy according to claim 1, wherein the ultrasonic tool head (9) is an ultrasonic probe, and the material of the ultrasonic tool head (9) is titanium alloy or niobium alloy.
7. An apparatus for preparing an aluminum alloy semi-solid slurry according to claim 1, wherein the stand (12) adjusts a stirring position of the ultrasonic means by means of a hydraulic lever.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921631184.6U CN210730934U (en) | 2019-09-27 | 2019-09-27 | Device for preparing aluminum alloy semi-solid slurry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921631184.6U CN210730934U (en) | 2019-09-27 | 2019-09-27 | Device for preparing aluminum alloy semi-solid slurry |
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| Publication Number | Publication Date |
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| CN210730934U true CN210730934U (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921631184.6U Expired - Fee Related CN210730934U (en) | 2019-09-27 | 2019-09-27 | Device for preparing aluminum alloy semi-solid slurry |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110625083A (en) * | 2019-09-27 | 2019-12-31 | 西南交通大学 | Device and method for preparing aluminum alloy semi-solid slurry |
| CN114150170A (en) * | 2021-11-30 | 2022-03-08 | 大连交通大学 | Stirring device, stirring method and application for preparing aluminum alloy semi-solid composite slurry |
-
2019
- 2019-09-27 CN CN201921631184.6U patent/CN210730934U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110625083A (en) * | 2019-09-27 | 2019-12-31 | 西南交通大学 | Device and method for preparing aluminum alloy semi-solid slurry |
| CN110625083B (en) * | 2019-09-27 | 2024-01-30 | 西南交通大学 | Device and method for preparing aluminum alloy semi-solid slurry |
| CN114150170A (en) * | 2021-11-30 | 2022-03-08 | 大连交通大学 | Stirring device, stirring method and application for preparing aluminum alloy semi-solid composite slurry |
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Granted publication date: 20200612 Termination date: 20210927 |