CN210085546U - Device for composite degassing and grain refining of cast aluminum alloy melt - Google Patents
Device for composite degassing and grain refining of cast aluminum alloy melt Download PDFInfo
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- CN210085546U CN210085546U CN201920957491.7U CN201920957491U CN210085546U CN 210085546 U CN210085546 U CN 210085546U CN 201920957491 U CN201920957491 U CN 201920957491U CN 210085546 U CN210085546 U CN 210085546U
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Abstract
The utility model belongs to the technical field of non-ferrous metal casting devices, and relates to a device for composite degassing and grain refinement of cast aluminum alloy melt, which comprises a device main body; the device main body comprises a smelting furnace and a furnace cover, and a furnace cover lifting system is also arranged on the smelting furnace; the middle part of the furnace cover is connected with a rotating shaft through a high-temperature sealing bearing in a penetrating manner, the top and the bottom of the rotating shaft are respectively connected with a rotating motor and a rotating degassing rotor, an argon channel communicated with the rotating degassing rotor is arranged inside the rotating shaft, the other end of the argon channel is connected with an argon gas supply unit, ultrasonic transmitters are uniformly arranged on the furnace cover around the rotating shaft, and a negative pressure gauge is arranged on the furnace cover in a penetrating manner; and the smelting furnace is also provided with an exhaust pipe which extends outwards in a communicated manner, and the other end of the exhaust pipe is connected with the negative pressure pump through an exhaust gas cooling system. The utility model discloses combine together two kinds of degasification modes of rotatory degasification and vacuum degasification, the degasification is effectual to refine the crystalline grain through the ultrasonic wave, realized the melt-purification and the compound function that the crystalline grain refined, the practicality is strong.
Description
Technical Field
The utility model relates to a non ferrous metal casting device technical field specifically is a device that compound degasification of casting aluminum alloy fuse-element and crystalline grain refine.
Background
The cast aluminum alloy has the advantages of high specific strength, low density, good casting formability, excellent thermal conductivity and the like, and is widely applied to industrial production of engine pistons, cylinder bodies, cylinder covers, brackets and the like for aviation, aerospace and motor vehicles. However, in the process of smelting aluminum alloy, a large amount of hydrogen atoms are easily dissolved in a liquid melt, so that the hydrogen content in the melt is dozens of times higher than that in a solidified state, and the hydrogen content is increased more along with the temperature rise, so that the defects of pinholes and inclusions are formed in a casting, and the mechanical property of the casting is reduced. Furthermore, in the casting process of aluminum alloy, because the solidification time of the melt in the mold is long, coarse grains are easily formed, and the mechanical properties are also reduced. In conclusion, degassing purification and solidification grain refinement of aluminum alloy melt are important guarantee measures for producing high-quality castings and are common means for improving comprehensive properties of castings.
Therefore, in order to obtain high-quality aluminum alloy components, it is necessary to research and adopt advanced aluminum melt degassing treatment methods to remove gas and inclusions in molten aluminum. The main current means of degassing and grain refinement is chemical meltingAgent (hexachloroethane C)2Cl6) Degassing and precious metal grain refinement, or blowing inert gas by rotation, but the degassing efficiency using a chemical flux is low, the degassing effect of introducing inert gas is unstable, the size of bubbles is large, or the effect is not good when combined bubbles are generated.
At present, a degassing device for aluminum melt is mostly composed of a vacuum system and a vacuum furnace, the aluminum alloy melt is vacuumized by virtue of the vacuum device so as to achieve the purposes of reducing the hydrogen content of the melt and reducing air holes in a casting, but the single vacuum degassing device has low degassing speed, wastes energy and has poor degassing effect, and alloy elements in the middle of the melt are burnt due to long-time degassing, so that the alloy components are influenced, and the vacuum degassing device is not suitable for industrial production.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's difference, provides a device that compound degasification of casting aluminum alloy fuse-element and crystalline grain refine, and the device combines together rotatory degasification and vacuum degasification, and uses the ultrasonic wave to refine the crystalline grain, and is rational in infrastructure, and the degasification is effectual, has realized that the fuse-element purifies and the complex function that the crystalline grain refined.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: a device for composite degassing and grain refinement of cast aluminum alloy melt comprises a device main body;
the device main body comprises a smelting furnace and a furnace cover which are matched with each other, and the smelting furnace is also provided with a furnace cover lifting system for controlling the lifting of the furnace cover;
the middle part of the furnace cover is connected with a rotating shaft in a penetrating way through a high-temperature sealing bearing, the top of the rotating shaft is connected with a rotating motor, the bottom of the rotating shaft is connected with a rotating degassing rotor, the rotating shaft is of a hollow structure, an argon channel communicated with the rotating degassing rotor is arranged in the rotating shaft, the other end of the argon channel is connected with an argon gas supply unit, ultrasonic transmitters are uniformly arranged on the furnace cover around the rotating shaft, the ultrasonic transmitters penetrate through the furnace cover and extend into the smelting furnace, and a negative pressure gauge is arranged on;
still the intercommunication is provided with the exhaust tube that extends outward on the smelting furnace, and another tip of exhaust tube is connected with exhaust cooling system, and exhaust cooling system's the other end is connected with the negative pressure pump.
The utility model is also characterized in that,
the smelting furnace is characterized in that a steel crucible is arranged in the smelting furnace in a manner of being tightly attached to the furnace wall, first high-temperature sealing rings are arranged at the connecting part of the steel crucible and the furnace cover, and positioning locking bolts for fixing are correspondingly arranged on the outer side of the smelting furnace and the furnace cover.
Wherein, bell operating system is electric putter, and electric putter's top is passed through the connecting block and is connected with the bell.
Wherein, the pivot top is provided with from the driving wheel, is provided with the action wheel on the output shaft of rotating electrical machines, and the action wheel passes through the belt with following the driving wheel and connects.
Wherein, the argon gas air feed unit is the argon gas bottle, is provided with pressure valve and manometer on the argon gas bottle.
The waste gas cooling system is composed of a cooling pipe and a cooling tank, one end of the cooling pipe is communicated with the exhaust pipe, the other end of the cooling pipe is communicated with the negative pressure pump, and the cooling pipe is immersed in the cooling tank filled with cooling liquid.
Wherein, the cooling pipe is in a spiral structure.
Wherein, the length of the ultrasonic emitter extending into the smelting furnace is one tenth of the height of the smelting furnace.
Wherein, the part of the ultrasonic emitter connected with the furnace cover is provided with a second high-temperature sealing ring.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model has reasonable structure and simple operation, combines two degassing modes of rotary degassing and vacuum degassing through the rotary degassing rotor and the negative pressure pump, can complete degassing by utilizing the heat preservation time of the traditional degassing process, has good degassing effect, short time consumption and saves energy; meanwhile, the invention refines the crystal grains by the ultrasonic waves emitted by the plurality of ultrasonic emitters, saves a metal grain refiner, effectively reduces the cost and realizes the composite functions of melt purification and crystal grain refinement.
Drawings
FIG. 1 is a left side view of an apparatus for combined degassing and grain refinement of a cast aluminum alloy melt according to the present invention;
FIG. 2 is a right side view of an apparatus for combined degassing and grain refinement of a cast aluminum alloy melt according to the present invention;
FIG. 3 is a picture of samples of example 1 and comparative example 1, in which (a) is the sample of comparative example 1 and (b) is the sample of example 1;
FIG. 4 is a metallographic structure diagram of samples of example 1 and comparative example 1, in which (a) is a sample of comparative example 2 and (b) is a sample of example 1.
In the figure: 1. an ultrasonic transmitter; 2. rotating the degassing rotor; 3. an argon gas channel; 4. a rotating electric machine; 5. a furnace cover; 6. a second high temperature seal ring; 7. a negative pressure gauge; 8. sealing the bearing at high temperature; 9. a smelting furnace; 10. a steel crucible; 11. a negative pressure pump; 12. an exhaust gas cooling system; 13. a furnace cover lifting system.
Detailed Description
A specific embodiment of the present invention will be further described with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1 and 2, an apparatus for composite degassing and grain refinement of a cast aluminum alloy melt comprises an apparatus body for performing composite degassing and grain refinement of an aluminum alloy melt;
the device main body comprises a smelting furnace 9 and a furnace cover 5 which are matched with each other, in order to ensure the vacuum environment in the smelting furnace 9, a steel crucible 10 is arranged in the smelting furnace 9 and clings to the furnace wall, first high-temperature sealing rings are arranged at the connecting parts of the steel crucible 10 and the furnace cover 5, namely the steel crucible 10 and the furnace cover 5 are in sealing connection through the high-temperature sealing rings, positioning and locking bolts for fixing are correspondingly arranged outside the smelting furnace 9 and on the furnace cover 5, and after the furnace cover 5 is covered on the smelting furnace 9, the furnace cover 5 and the smelting furnace 9 are tightly connected by operating the positioning and locking bolts;
the smelting furnace 9 is also provided with a furnace cover lifting system 13 for controlling the lifting of the furnace cover 5, and the furnace cover lifting system 13 is used for lifting the furnace cover upwards or lowering the furnace cover downwards; in order to facilitate the operation of the lifting furnace cover, the furnace cover lifting system 13 is set as an electric push rod, the top of the electric push rod is connected with the furnace cover 5 through a connecting block, namely, a connecting ring is fixedly arranged at the outer end of the furnace cover 5, the connecting block is arranged on the connecting ring, the top of the electric push rod is connected with the connecting block, a switch for controlling the extension, contraction and extension length of the electric push rod is arranged on the electric push rod, the electric push rod is controlled to lift through the switch in operation, so that the furnace cover 5 extends upwards to be away from the smelting furnace 9, when the furnace cover needs to be closed, the electric push rod is operated to contract, the furnace cover 5 is attached to the smelting furnace 9 through the;
the middle part of the furnace cover 5 is connected with a rotating shaft through a high-temperature sealing bearing 8, the top of the rotating shaft is connected with a rotating motor 4, the bottom of the rotating shaft is connected with a rotating degassing rotor 2, the model of the rotating degassing rotor 2 is 121, the rotating shaft is of a hollow structure, an argon channel 3 communicated with the rotating degassing rotor 2 is arranged in the rotating shaft, the other end of the argon channel 3 is connected with an argon gas supply unit, in order to facilitate inflation, the argon gas supply unit is an argon gas bottle, a pressure valve and a pressure gauge are arranged on the argon gas bottle, when inflation is needed, the argon gas bottle can be started, namely, the argon channel 3 used for ventilating the smelting furnace 9 is arranged in the rotating shaft in a penetrating mode, the bottom of the argon gas channel 3 is communicated with the rotating degassing rotor 2, the top of;
in order to ensure the use of the argon gas channel 3, the connection mode of the rotating motor 4 and the rotating shaft is optimized, a driven wheel is arranged at the top of the rotating shaft, a driving wheel is arranged on an output shaft of the rotating motor 4, the driving wheel and the driven wheel are connected through a belt, when the argon gas degassing device is used, the rotating motor 4 is started to drive the driving wheel to rotate, the driving wheel rotates to drive the driven wheel to rotate, so that the rotating shaft is driven to rotate, and finally the rotation of the rotary degassing rotor 2;
the furnace cover 5 is also uniformly provided with an ultrasonic emitter 1 around the rotating shaft, the ultrasonic emitter 1 aims at ultrasonically treating the molten aluminum to refine crystal grains, in order to ensure a vacuum environment, a second high-temperature sealing ring 6 is arranged at the position where the ultrasonic emitter 1 is connected with the furnace cover 5, the ultrasonic emitter 1 penetrates through the furnace cover 5 and extends into the smelting furnace 9, the length of the ultrasonic emitter 1 extending into the smelting furnace 9 is one tenth of the height of the smelting furnace 9, thus after the furnace cover 5 is covered, the ultrasonic emitter 1 can extend into the molten aluminum in a steel crucible 10 by 10-20mm, so that the molten aluminum is used as a propagation medium to realize the effect of ultrasonically treating the refined crystal grains of the molten aluminum, a negative pressure gauge 7 for detecting the internal pressure of a device main body is arranged on the furnace cover 5 in a penetrating manner, and the negative pressure;
be provided with the exhaust tube on the smelting furnace 9, the exhaust tube runs through smelting furnace 9 and outwards extends, and end connection has exhaust gas cooling system 12, exhaust gas cooling system 12's the other end is connected with negative-pressure pump 11, negative-pressure pump 11's model is DG horizontal multistage pump or the negative-pressure pump of equivalent function, the waste gas in smelting furnace 9 is taken out after negative-pressure pump 11 starts, wherein exhaust gas cooling system 12 is used for preventing high-temperature gas from burning out the negative-pressure pump, exhaust gas cooling system 12 comprises cooling tube and cooling bath, the one end and the exhaust tube intercommunication of cooling tube, the other end communicates with negative-pressure pump 11, the cooling tube immerses in the cooling bath of placing the coolant liquid, in order to strengthen the cooling effect, the cooling tube establishes to the.
When the method is specifically implemented, firstly, the furnace cover 5 is lifted through the furnace cover lifting system 13, the aluminum alloy is melted by the smelting furnace, and heat is preserved when the melt is heated to a proper temperature; then closing the furnace cover 5, wherein the rotary degassing rotor 2 is just positioned in the middle of the melt, starting the negative pressure pump 11, starting the rotary motor 4 to drive the rotary degassing rotor 2 to rotate when the negative pressure reaches-0.06 MPa to-0.1 MPa, starting argon to blow up, controlling the air pressure to be 0.3 to 0.6MPa, breaking or forming micro-bubbles by utilizing the rotation of the rotary degassing rotor 2, then floating the bubbles out of the melt liquid surface through argon, pumping out gas through the negative pressure pump 11, cooling the gas through the waste gas cooling system 12, preventing the negative pressure pump 11 from overburning, then discharging the gas into dust-removing environment-friendly equipment, reducing dust, filtering and then discharging the gas into the atmosphere, ensuring no smoke dust in the operation of the equipment and ensuring the safety of workers; the rotary degassing is kept for 10-15 min, the negative pressure is kept for 15-20 min after the rotary degassing is stopped, all the floated bubbles are discharged out of the furnace body, and the suspended bubbles in the melt can rise to the liquid surface to be discharged by the negative pressure so as to achieve effective degassing;
after the degassing is finished, after the temperature reaches 680-730 ℃, simultaneously starting 4 ultrasonic emitters 1 on a furnace cover 5, enabling an ultrasonic contact to extend into the liquid level by 10-20mm, enabling the ultrasonic power to be 2000W, enabling the ultrasonic time to be 5-10 min, turning off the negative pressure after the ultrasonic treatment is finished, and enabling the ultrasonic waves to effectively disperse alloy nucleation particles and crystal grains to achieve the effects of refining the crystal grains and uniformly distributing the crystal grains; after the pressure is unloaded, the temperature of the melt is raised to 740-780 ℃, the furnace cover is opened, and the parts are poured.
Comparative example 1
The chemical agent and the rotary degassing mode in the traditional method are combined to carry out degassing.
Comparative example 2
And (3) refining the component by using a grain refiner.
We compared the performance of the parts treated using the apparatus of example 1 with that of the sample of comparative example 1, fig. 3 is a picture of the samples of example 1 and comparative example 1, table 1 is a performance comparison table of the samples of example 1 and comparative example 1, wherein (a) is the sample of comparative example 1 and (b) is the sample of example 1, and it can be seen from fig. 3 that the sample of comparative example 1 has obvious bubbles, while the sample of example 1 has a flat surface without bubbles; as can be seen from table 1, the performance of the example 1 sample is significantly better than that of the comparative example 1 sample.
TABLE 1 comparison of sample Properties
We compared the performance of the parts treated by the apparatus of example 1 with that of the sample of comparative example 2, fig. 4 is a metallographic structure diagram of the samples of example 1 and comparative example 1, table 1 is a performance comparison table of the samples of example 1 and comparative example 2, wherein (a) is the sample of comparative example 2, and (b) is the sample of example 1, and as can be seen from fig. 4, the crystal grains of the sample of example 1 are more refined; as can be seen from table 1, the performance of the example 1 sample is significantly better than that of the comparative example 1 sample.
TABLE 2 comparison of sample Properties
The above disclosure is only specific embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be considered by those skilled in the art should fall within the protection scope of the present invention.
Claims (9)
1. The device for composite degassing and grain refinement of the cast aluminum alloy melt is characterized by comprising a device main body;
the device main body comprises a smelting furnace (9) and a furnace cover (5) which are matched with each other, and a furnace cover lifting system (13) for controlling the furnace cover (5) to lift is further arranged on the smelting furnace (9);
the middle part of the furnace cover (5) is in through connection with a rotating shaft through a high-temperature sealing bearing (8), the top of the rotating shaft is connected with a rotating motor (4), the bottom of the rotating shaft is connected with a rotating degassing rotor (2), the rotating shaft is of a hollow structure, an argon channel (3) communicated with the rotating degassing rotor (2) is arranged in the rotating shaft, the other end of the argon channel (3) is connected with an argon gas supply unit, ultrasonic transmitters (1) are uniformly arranged on the furnace cover (5) around the rotating shaft, the ultrasonic transmitters (1) penetrate through the furnace cover (5) and extend into the smelting furnace (9), and a negative pressure gauge (7) is arranged on the furnace cover (5) in a through manner;
still the intercommunication is provided with the exhaust tube that extends outward on smelting furnace (9), another tip of exhaust tube is connected with exhaust gas cooling system (12), the other end and the negative pressure pump (11) of exhaust gas cooling system (12) are connected.
2. The device for the composite degassing and grain refinement of the cast aluminum alloy melt according to claim 1, wherein a steel crucible (10) is arranged inside the smelting furnace (9) and is tightly attached to the furnace wall, a first high-temperature sealing ring is arranged at the connecting part of the steel crucible (10) and the furnace cover (5), and positioning and locking bolts for fixing are correspondingly arranged on the outer side of the smelting furnace (9) and the furnace cover (5).
3. The device for the composite degassing and grain refinement of the cast aluminum alloy melt as claimed in claim 1, wherein the furnace cover lifting system (13) is an electric push rod, and the top of the electric push rod is connected with the furnace cover (5) through a connecting block.
4. The device for composite degassing and grain refinement of cast aluminum alloy melt as claimed in claim 1, wherein a driven wheel is arranged at the top of the rotating shaft, a driving wheel is arranged on an output shaft of the rotating motor (4), and the driving wheel and the driven wheel are connected through a belt.
5. The apparatus for combined degassing and grain refinement of a cast aluminum alloy melt as recited in claim 1, wherein said argon gas supply unit is an argon gas cylinder, and said argon gas cylinder is provided with a pressure valve and a pressure gauge.
6. A cast aluminum alloy melt composite degassing and grain refinement apparatus as claimed in claim 1, wherein said exhaust gas cooling system (12) is comprised of a cooling pipe and a cooling tank, one end of said cooling pipe is communicated with said suction pipe, the other end is communicated with said negative pressure pump (11), said cooling pipe is immersed in said cooling tank in which a cooling liquid is placed.
7. The apparatus for combined degassing and grain refinement of a cast aluminum alloy melt as recited in claim 6 in which said cooling tube has a helical configuration.
8. An apparatus for combined degassing and grain refinement of a cast aluminum alloy melt as in claim 1, characterized in that the length of the ultrasonic emitter (1) extending into the melting furnace (9) is one tenth of the height of the melting furnace (9).
9. The device for the composite degassing and grain refinement of the cast aluminum alloy melt as claimed in claim 1, wherein a second high-temperature sealing ring (6) is arranged at the connecting part of the ultrasonic emitter (1) and the furnace cover (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920957491.7U CN210085546U (en) | 2019-06-24 | 2019-06-24 | Device for composite degassing and grain refining of cast aluminum alloy melt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920957491.7U CN210085546U (en) | 2019-06-24 | 2019-06-24 | Device for composite degassing and grain refining of cast aluminum alloy melt |
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| CN210085546U true CN210085546U (en) | 2020-02-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172600A (en) * | 2019-06-24 | 2019-08-27 | 西安工业大学 | A kind of device and application method of cast aluminium alloy gold melt compound degasification and crystal grain refinement |
| CN112458301A (en) * | 2020-11-19 | 2021-03-09 | 中南大学 | Ultrasonic rotary-cut auxiliary casting equipment |
-
2019
- 2019-06-24 CN CN201920957491.7U patent/CN210085546U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172600A (en) * | 2019-06-24 | 2019-08-27 | 西安工业大学 | A kind of device and application method of cast aluminium alloy gold melt compound degasification and crystal grain refinement |
| CN112458301A (en) * | 2020-11-19 | 2021-03-09 | 中南大学 | Ultrasonic rotary-cut auxiliary casting equipment |
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Effective date of registration: 20220309 Address after: 710000 No. 1, row 1, Yutong Industrial Park, No. 1, Fangyi Road, Baqiao District, Xi'an City, Shaanxi Province Patentee after: Shaanxi Pengyun machinery automation technology Co.,Ltd. Address before: 710021 No. 2 Xuefu Road, Weiyang District, Xi'an, Shaanxi Patentee before: XI'AN TECHNOLOGICAL University |
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Effective date of registration: 20220331 Address after: 710199 plant 2, No. 29, Shanglinyuan Third Road, high tech Zone, Xi'an, Shaanxi Province Patentee after: Xi'an Kangbo New Material Technology Co.,Ltd. Address before: 710000 No. 1, row 1, Yutong Industrial Park, No. 1, Fangyi Road, Baqiao District, Xi'an City, Shaanxi Province Patentee before: Shaanxi Pengyun machinery automation technology Co.,Ltd. |
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