CN115161520B

CN115161520B - High-strength and high-toughness aluminum alloy for casting without heat treatment and preparation process thereof

Info

Publication number: CN115161520B
Application number: CN202210636963.5A
Authority: CN
Inventors: 王进; 黎柏康; 章晶林; 张长建; 林煜昊; 刘骏
Original assignee: Hubei New Jinyang Resources Co ltd
Current assignee: Hubei New Jinyang Resources Co ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2023-05-05
Anticipated expiration: 2042-06-07
Also published as: CN115161520A

Abstract

The invention relates to the technical field of aluminum alloy casting, and discloses a high-strength and high-toughness aluminum alloy for heat treatment-free casting, which is characterized by comprising, by mass, 8.5-10.5% of Si, less than or equal to 0.15% of Fe, less than or equal to 0.06% of Mg, 0.35-0.6% of Mn, 0.006-0.025% of Sr0.025% of Al and the balance of unavoidable impurities. The invention has the following advantages and effects: by strictly controlling the components, various properties of the alloy reach excellent indexes, and the alloy has good mechanical properties, particularly ductility, and can realize complex die casting design due to excellent castability and weldability of the traditional die casting AlSi alloy without heat treatment. The alloy of the invention is applied to automobile body longitudinal beams and compact suspension struts, and can replace complex steel plate structures, top reinforcing plates, safety shells of connectors and the like.

Description

High-strength and high-toughness aluminum alloy for casting without heat treatment and preparation process thereof

Technical Field

The invention relates to the technical field of aluminum alloy casting, in particular to a high-strength and high-toughness aluminum alloy for casting without heat treatment.

Background

The new energy automobile is an automobile which adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel automobile-mounted power device) and integrates the advanced technology in the aspects of power control and driving of the automobile, and the formed technical principle is advanced, and the automobile has a new technology and a new structure. New energy vehicles include four large types of Hybrid Electric Vehicles (HEV), pure electric vehicles (BEV, including solar vehicles), fuel Cell Electric Vehicles (FCEV), other new energy vehicles (e.g., super capacitors, efficient energy storage such as flywheels), and the like. Unconventional automotive fuels refer to fuels other than gasoline, diesel.

With the development of new energy automobiles, automobile lightweight design has become a trend of world automobile development. The research shows that the endurance mileage of the new energy automobile can be improved by 10% -11% when the weight of the new energy automobile is reduced by 100kg, and the battery cost and the daily loss cost can be reduced by 20%. The aluminum alloy is used as a preferred material for light weight of automobiles, and has the advantages of weight reduction, consumption reduction, energy conservation and environmental protection. The environment-friendly, recyclable and corrosion-resistant performance is good, and the running balance and safety of the vehicle are improved. The die-casting part is changed from a functional part to a structural part, the development trend is biased towards thin-wall parts, integration and structural complexity, the structural part is required to have high strength and high extension, and the basic quality requirements of no foaming of the surface, no cracking in riveting and the like after T6/T7 heat treatment are met.

At present, the heat treatment is needed for the die-casting structural member to meet the performance requirement, but the uncontrollable factors in the heat treatment process are more, and finally the die-casting structural member after heat treatment is deformed, the yield is low, and the cost is higher.

Disclosure of Invention

The invention aims to provide a high-strength and high-toughness heat-treatment-free aluminum alloy for casting and a preparation process thereof, and the aluminum alloy has a heat treatment-free effect.

The technical aim of the invention is realized by the following technical scheme: the high strength and toughness heat treatment free aluminum alloy for casting consists of Si8.5-10.5 wt%, fe less than or equal to 0.15 wt%, mg less than or equal to 0.06 wt%, mn0.35-0.6 wt%, S0.006-0.025 wt% and Al and inevitable impurities for the rest.

The invention is further provided with: the alloy also comprises the following components, wherein Zr is less than or equal to 0.30 percent, and Cr is less than or equal to 0.10 percent.

The invention also provides a preparation process of the high-strength and high-toughness heat-treatment-free aluminum alloy for casting, which comprises the following steps of: step one, heating a melting furnace to 750-760 ℃, adding raw materials to melt to obtain aluminum liquid, wherein the melting is electromagnetic stirring melting, and stirring the aluminum liquid by penetrating through the bottom of a furnace through a magnetic field; and step two, removing slag, degassing on line, filtering and casting the aluminum liquid obtained in the step one.

The invention is further provided with: the online degassing is in-furnace degassing, the temperature of a melting furnace is adjusted to 730-740 ℃ during in-furnace degassing, then inert gas with the pressure of 0.2-0.3Mpa is input into the aluminum liquid, the degassing time is 3-5min, and the height of bubbles formed at the top of the aluminum liquid is lower than 10cm.

The invention is further provided with: and during online degassing, inert gas is used as a carrier, and the flux is rotated and sprayed into the aluminum liquid.

The invention is further provided with: the online degassing adopts the degasser, and the degasser includes frame, crane, drive crane lift's lift adjustment mechanism, installs in the pivot of crane, drive pivot pivoted motor, flux feeder, inert gas air feed hose, and the pivot cavity sets up, and the shower nozzle is installed to the lower extreme, and swivel joint is installed to the upper end, and inert gas air feed hose links to each other with the swivel joint, flux feeder be connected with transparent hose, with the insulating tube that transparent hose is linked together, in inserting the shower nozzle after passing swivel joint, pivot after the insulating tube passes inert gas hose, a plurality of orifices have been seted up to the shower nozzle, be equipped with in the shower nozzle and aim at the convex part of insulating tube, the convex part lateral wall is provided with the stirring piece, rack-mount has the governing cylinder, governing cylinder piston rod installation coupling assembling, the insulating tube upper end with coupling assembling is fixed mutually, flux feeder includes the material box, installs the unloading pipe of material box bottom, install valve on the unloading pipe, the unloading pipe with transparent hose middle part is linked together, let in inert gas in the transparent hose.

The invention is further provided with: the filtration was performed using a 60 mesh porous ceramic foam filter plate.

The invention is further provided with: casting is casting, standing for 30min before casting, wherein the casting temperature is 680-720 ℃, and the casting rate is 30-50Hz.

The beneficial effects of the invention are as follows:

1. the Si content is 8.5-10.5%, and the Si element ensures that the aluminum alloy has good fluidity, improves the filling capability of the alloy in the die casting process, and simultaneously reduces the shrinkage and thermal cracking tendency of the alloy during solidification.

The Sr content is 0.006-0.025%, the ductility of the alloy is improved, the deterioration capacity of Sr changes the Si phase of lamellar or lath shape into coral shape, but Sr increases the hydrogen absorption of aluminum liquid, so that the aluminum liquid is effectively deaerated by rotary blowing, thereby reducing the void ratio and improving the weldability.

Fe is less than or equal to 0.15 percent, and the lower Fe content can avoid the formation of a coarse acicular AlFeSi phase, thereby improving the strength, the elongation and the fatigue strength of the alloy.

Mn0.35-0.6%, preventing aluminum liquid from sticking on the die, so that the alloy is easy to demould, al12Mn3Si2 is formed, the microstructure of the alloy is spherical particles, and the influence on a matrix is small.

Mg is less than or equal to 0.06 percent, and the lower content of Mg mainly reduces the influence of Mg on the aging behavior generated by the automobile part baking finish process.

By strictly controlling the components, various properties of the alloy reach excellent indexes, and the alloy has good mechanical properties, particularly ductility, and can realize complex die casting design due to excellent castability and weldability of the traditional die casting AlSi alloy without heat treatment. The alloy of the invention is applied to automobile body longitudinal beams and compact suspension struts, and can replace complex steel plate structures, top reinforcing plates, safety shells of connectors and the like.

2. In the prior art, inert gas is used for conveying the flux, and the following problems exist that in order to prevent high Wen Rongye from sucking air in the degassing process, the flow rate of the inert gas is generally controlled within a certain range, such as 20L/min, so that the pushing effect of air flow on the solvent is small, and the flux cannot be uniformly dispersed in the melt. The flux flow is controlled by the gas pressure completely, and under the condition of insufficient gas pressure, the pipeline is easy to be blocked, and the phenomenon of negligence occurs in the high-temperature solution. In addition, the flux becomes soft after being heated in the channel, and the pipeline is easier to be blocked after the flux becomes soft.

In order to solve the problems, the applicant has studied that the inert gas hose is used as a main gas supply channel, the transparent hose and the heat insulation pipe are used as channels for providing the flux, the gas pressure in the transparent hose and the heat insulation pipe can be higher than the gas pressure in the inert gas hose, the total flow sprayed out by the spray head is ensured not to cause high Wen Rongye to suck gas, and sufficient thrust can be provided for the flux to prevent the flux from being blocked in the transparent hose or the heat insulation pipe.

In order to avoid the phenomenon that the flux is heated and blocked in the pipeline, the heat insulation pipe is independently arranged and inserted into the rotating shaft after downwards passing through the rotary joint, inert gas continuously flows in the space between the outer wall of the heat insulation pipe and the inner wall of the rotating shaft, and the phenomenon that the flux is softened and blocked in the pipeline after being heated is reduced.

The convex part and the stirring sheet in the spray head have two functions, namely, the lower end of the rotating shaft and the spray head enter the high Wen Rongye during working, the rotating shaft and the spray head rotate under the action of the motor, the flux sprayed out of the lower end of the heat insulation pipe is stirred and dispersed in the spray head after contacting the stirring sheet and then sprayed out by the spray head, and the stirring sheet on the convex part plays a role in promoting uniform gas-solid phase mixing. Secondly, after flux in the isolation tube is blocked, the transparent hose is blocked, a worker observes that the transparent hose is blocked, the action of the adjusting cylinder is controlled, after the isolation tube descends, the convex part and the stirring sheet are inserted into the isolation tube to dredge, the adjusting cylinder is controlled again to enable the isolation tube to ascend, after the flux blocks the isolation tube, production line equipment can dredge the isolation tube without stopping, and a large amount of energy sources are saved.

3. The invention takes inert gas as a carrier, sprays flux into the aluminum liquid, and removes impurities such as oxides in the aluminum liquid under the dual actions of the inert gas and the flux. The high-speed rotary blowing mode is selected during spraying, so that impurities and hydrogen are removed more effectively, and the cleanliness of the aluminum liquid is improved.

When in melting, an electromagnetic stirring technology is adopted, a magnetic field penetrates through the furnace bottom to stir the aluminum liquid, so that the diffusion and dissolution of alloy materials are accelerated, the components and the temperature of the aluminum liquid are promoted to be uniform, the energy consumption is reduced, and the product quality is improved.

The 60-mesh porous foam ceramic filter plate is used for filtering in the casting process, has a plurality of holes with zigzag and different section diameters, can effectively intercept inclusions in the aluminum liquid, and controls the purity of the aluminum liquid.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a rivet crack criteria in a rivet test.

Fig. 2 is the result of the riveting test.

Fig. 3 is a graph of pinhole density in a conventional aluminum ingot standard.

FIG. 4 is a schematic drawing of the pinhole density of an aluminum ingot according to the present invention.

FIG. 5 is a die-cast cylindrical test bar fracture morphology of the present invention.

FIG. 6 is a die-cast flat sample fracture morphology of the present invention.

FIG. 7 is a diagram showing the microstructure morphology of a metallographic microscope according to the present invention.

FIG. 8 is a diagram of the tissue morphology of the scanning electron microscope of the present invention.

FIG. 9 is a second image of the tissue morphology of the scanning electron microscope of the present invention.

FIG. 10 is a third image of the tissue morphology of the scanning electron microscope of the present invention.

FIG. 11 is an analysis result of the present invention.

FIG. 12 is a graph showing the results of the spectral selection analysis of the present invention.

FIG. 13 is a schematic view of the deaerator of the present invention.

FIG. 14 is a schematic view showing the structural relationship among the spindle, the shower head, and the insulating tube of the present invention.

In the figure, 1, a rack; 11. a lifting adjusting mechanism; 2. flux feeding means; 21. a material box; 22. discharging pipes; 3. an inert gas supply hose; 4. a rotating shaft; 41. a swivel joint; 5. a spray head; 51. a convex portion; 52. a stirring sheet; 6. a transparent hose; 7. a heat insulating pipe; 8. a lifting adjusting mechanism; 9. adjusting a cylinder; 91. and a connection assembly.

Detailed Description

The technical scheme of the present invention will be clearly and completely described in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

A preparation process of high-strength and high-toughness heat-treatment-free aluminum alloy for casting comprises the following steps:

step one, heating a melting furnace to 750-760 ℃, adding raw materials to melt to obtain aluminum liquid, wherein the melting is electromagnetic stirring melting, and stirring the aluminum liquid by penetrating through the bottom of a furnace through a magnetic field;

step two, the aluminum liquid obtained in the step one is subjected to deslagging, online degassing, filtering and casting, online degassing is carried out in a furnace, the temperature of a melting furnace is adjusted to 730-740 ℃ during the in-furnace degassing, then inert gas with the pressure of 0.2-0.3Mpa is input into the aluminum liquid, the degassing time is 3-5min, and the height of bubbles formed at the top of the aluminum liquid is lower than 10cm. And during online degassing, inert gas is used as a carrier, and the flux is sprayed into the aluminum liquid.

On-line degassing adopts a degassing machine, as shown in fig. 13 and 14, the degassing machine comprises a frame 1, a lifting frame, a lifting adjusting mechanism 811 for driving the lifting frame to lift, a rotating shaft 4 arranged on the lifting frame, a motor for driving the rotating shaft 4 to rotate, a flux feeding device 2 and an inert gas supply hose 3, wherein the lifting adjusting mechanism 811 is an air cylinder, the rotating shaft 4 is arranged in a hollow mode, a spray head 5 is arranged at the lower end, a rotary joint 41 is arranged at the upper end, the inert gas supply hose 3 is connected with the rotary joint 41, the flux feeding device 2 is connected with a transparent hose 6 and a heat insulation pipe 7 communicated with the transparent hose 6, the heat insulation pipe 7 passes through the rotary joint 41 after passing through the inert gas hose and the rotating shaft 4, and is inserted into the spray head 5, a plurality of spray holes are formed in the spray head 5, a convex part 51 aligned with the heat insulation pipe 7 is arranged in the spray head 5, a stirring piece 52 is arranged on the side wall of the convex part 51, an adjusting air cylinder 9 is arranged on the frame 1, a piston rod of the adjusting air cylinder 9 is provided with a connecting component 91, the upper end of the heat insulation pipe 7 is fixed with the connecting component 91, the inert gas supply hose 2 comprises a material box 21, a valve 22 arranged at the bottom of the material box 21, a lower end of the material box 22 is arranged at the material box 22, a lower end of the material box 22 is connected with the transparent hose 6, and is communicated with the transparent hose 6. The inert gas pressure at the outlet of the spray head 5 is 0.2-0.3Mpa.

The filtration is carried out by using 60-mesh porous foam ceramic filter plates, casting is carried out, standing is carried out for 30min before casting, the casting temperature is 680-720 ℃, and the casting rate is 30-50Hz.

The high-strength and high-toughness aluminum alloy for casting without heat treatment, which is prepared by the preparation process, comprises 8.5-10.5% of Si, less than or equal to 0.15% of Fe, less than or equal to 0.06% of Mg, 0.35-0.6% of Mn, 0.006-0.025% of S, less than or equal to 0.30% of Zr, less than or equal to 0.10% of Cr, and the balance of Al and unavoidable impurities.

Experimental part:

mechanical property test

Preparing a die-casting long cylinder, a die-casting short cylinder, a die-casting flat test bar and a die-casting 3mm flat plate sample, and testing tensile strength, yield strength and elongation, wherein the test results are as follows:

TABLE 1 mechanical Property test-die casting Long cylindrical test results

Numbering device	Diameter of	Tensile strength (Mpa)	Yield strength (Mpa)	Elongation (%)
					1#	6.37	294	131	12.0
2#	6.43	290	128	12.0
					3#	6.5	283	129	14.5
4#	6.48	283	125	14.0
					5#	6.49	284	130	13.0
6#	6.47	274	117	12.0
					7#	6.52	281	125	12.5
8#	6.53	273	125	12.5
					9#	6.36	279	115	15.0
10#	6.49	277	118	15.0
					Average of	6.5	281.8	124.2	13.3

TABLE 2 mechanical Property test-die casting short cylinder test results

TABLE 3 mechanical property test-die-cast Flat test bar test results

Numbering device	Thickness of (L)	Width of (L)	Tensile strength (Mpa)	Yield strength (Mpa)	Elongation (%)
						1#	3.04	8.08	278	119	12.0
2#	3	8.17	288	135	17.5
						3#	3.03	8.13	282	124	12.0
4#	3.05	8.16	289	129	10.5
						5#	3.02	8.08	287	129	13.5
6#	3.03	8.13	285	132	14.0
						7#	3.02	8.13	286	135	13.5
8#	3.08	8.05	290	138	9.0
						9#	3.08	8.01	297	137	12.5
10#	3.06	8.01	296	140	12.0
						Average of	3.0	8.1	287.8	131.8	12.7

TABLE 4 mechanical property test-die casting 3mm Flat plate test results

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In order to just meet the market demand, in the ingot casting manufacturing process, the applicant puts forward a mechanical property control standard for gravity casting Shibang, and performs relevant test verification, and the result is as follows:

TABLE 5 mechanical New energy test-gravity cast test bar Performance control Standard and actual Condition

Project	Tensile strength of	Yield strength of	Elongation percentage
				Performance index control	≥180Mpa	≥90Mpa	≥10％
Actual reaching situation	200Mpa	100Mpa	13％

Riveting test

The die-casting parts are changed from functional parts to structural parts, and the development trend is biased to thin-wall parts, integration and structural complexity; the structural member is required to have high strength and high extension, so that the basic quality requirements of non-cracking riveting and the like are met;

referring to fig. 1, the product is riveted to the cracking standard. Referring to fig. 2, the results of the riveting test of the product prepared from the aluminum alloy according to the invention are that the riveting is satisfied without cracking.

Pinhole degree test of aluminum ingot casting

Standard for conventional aluminum ingot: the pinhole degree of the alloy is not more than three levels specified by JB/T7946.3 (see standard: GB/T8733-2013; JB/T7946.3-1999; see FIG. 3)

The aluminum ingot prepared by the invention is verified that the alloy pinhole degree is not more than the first level specified by JB/T7946.3, as shown in figure 4.

Fracture morphology of aluminum ingot alloy

Alloy fracture of conventional aluminum ingot refers to standard GB/T8733-2013, and the fracture structure of the ingot is compact and slag and inclusion are not allowed.

The fracture structure of the aluminum ingot prepared by the method is compact and uniform, and slag, inclusions and large-area looseness are not allowed.

Alloy microstructure morphology

1. Pressing microscopic appearance of fracture of sample

The fracture morphology of the die-cast cylindrical test bar is shown in fig. 6. Die cast flat specimen fracture morphology, see fig. 7. By observing that the fracture surrounding structure is a fine ductile pit structure, no obvious brittle phase exists, no obvious slag inclusion and serious air holes exist, the alloy has higher toughness.

2. Metallographic microscope tissue morphology

After die casting, the matrix structure is mainly alpha-Al (white particles) and eutectic Si phases (gray black areas) which are fine in size and distributed in a dispersing way, the eutectic Si is fibrous, no second phase with coarse size exists, and the JY-1 alloy has higher strength and toughness.

3. Tissue morphology and energy spectrum analysis data of scanning electron microscope

The white brightening substance is a second phase, and the second phase in the matrix structure after die casting can be seen to be finely dispersed, so that the alloy strength is improved, and meanwhile, the plasticity of the alloy is not greatly influenced

Spectral region analysis results: the high-brightness aggregation area of the Al element is an alpha-Al grain area, the high-brightness aggregation area of the Si is an Al-Si eutectic area, the high-brightness aggregation area of the Sr element is consistent with the Si element, the deterioration effect is better, other alloy elements are distributed and dispersed, no obvious aggregation area exists, the high-brightness aggregation area is mainly dissolved in a matrix, the alloy strength is improved, and meanwhile, the plasticity of the alloy is not greatly influenced.

In conclusion, the alloy of the invention has the characteristics of high strength and high toughness due to the unique component composition and the strengthening effect of the alloy of each trace element by Sr treatment.

Claims

1. The high-strength and high-toughness heat-treatment-free aluminum alloy for casting is characterized by comprising, by mass, 8.5-10.5% of Si, less than or equal to 0.15% of Fe, less than or equal to 0.06% of Mg, 0.35-0.6% of Mn, 0.006-0.025% of Sr0.006 and the balance of Al and unavoidable impurities; the preparation process of the high-strength and high-toughness heat-treatment-free aluminum alloy for casting comprises the following steps that firstly, a melting furnace is heated to 750-760 ℃, raw materials are put into the melting furnace to be melted to obtain aluminum liquid, the melting is electromagnetic stirring melting, and the aluminum liquid is stirred by penetrating through a furnace bottom through a magnetic field; step two, the aluminum liquid obtained in the step one is subjected to deslagging, online degassing, filtering and casting, the online degassing is in the furnace, the temperature of a melting furnace is adjusted to 730-740 ℃ during the degassing in the furnace, then inert gas with the pressure of 0.2-0.3MPa is input into the aluminum liquid, the degassing time is 3-5min, the height of bubbles formed at the top of the aluminum liquid is lower than 10cm, inert gas is used as a carrier during the online degassing, the flux is sprayed into the aluminum liquid, the online degassing adopts a degassing machine, the degassing machine comprises a frame, a lifting adjusting mechanism for driving the lifting frame to lift, a rotating shaft arranged on the lifting frame, a motor for driving the rotating shaft to rotate, a flux feeding device and an inert gas feeding hose, the rotating shaft is arranged in a hollow mode, a spray head is arranged at the lower end, a rotary joint is arranged at the upper end of the rotating shaft, the inert gas feeding hose is connected with the rotary joint, the flux feeding device is connected with a transparent hose and a heat insulation pipe which is communicated with the transparent hose, the heat insulation pipe penetrates through the rotary joint, the rotating shaft and then is inserted into the spray head, a plurality of convex parts which are aligned with the heat insulation pipe, the spray head are arranged in the spray head, the side wall is provided with the heat insulation pipe, the side wall is provided with a stirring plate, the transparent material is fixedly connected with the transparent material feeding pipe, the transparent material is fixedly arranged at the bottom material feeding device, the transparent material is connected with the transparent material pipe through the cylinder, the bottom material feeding device, the transparent material is arranged at the bottom material feeding device, the transparent material is connected with the transparent material pipe, the material feeding device, the material is arranged at the transparent material and the material feeding device, and the material is connected with the material through the rotary pipe and the material.

2. The high strength and toughness heat treatment free aluminum alloy for casting of claim 1, wherein: the alloy also comprises the following components, wherein Zr is less than or equal to 0.30 percent, and Cr is less than or equal to 0.10 percent.

3. A process for preparing the high-strength and high-toughness heat-treatment-free aluminum alloy for casting according to claim 1 or 2, which is characterized in that: the method comprises the following steps:

step two, the aluminum liquid obtained in the step one is subjected to deslagging, online degassing, filtering and casting, the online degassing is in the furnace, the temperature of a melting furnace is adjusted to 730-740 ℃ during the degassing in the furnace, then inert gas with the pressure of 0.2-0.3MPa is input into the aluminum liquid, the degassing time is 3-5min, the height of bubbles formed at the top of the aluminum liquid is lower than 10cm, inert gas is used as a carrier during the online degassing, the flux is sprayed into the aluminum liquid, the online degassing adopts a degassing machine, the degassing machine comprises a frame, a lifting adjusting mechanism for driving the lifting frame to lift, a rotating shaft arranged on the lifting frame, a motor for driving the rotating shaft to rotate, a flux feeding device and an inert gas feeding hose, the rotating shaft is arranged in a hollow mode, a spray head is arranged at the lower end, a rotary joint is arranged at the upper end of the rotating shaft, the inert gas feeding hose is connected with the rotary joint, the flux feeding device is connected with a transparent hose and a heat insulation pipe which is communicated with the transparent hose, the heat insulation pipe penetrates through the rotary joint, the rotating shaft and then is inserted into the spray head, a plurality of convex parts which are aligned with the heat insulation pipe, the spray head are arranged in the spray head, the side wall is provided with the heat insulation pipe, the side wall is provided with a stirring plate, the transparent material is fixedly connected with the transparent material feeding pipe, the transparent material is fixedly arranged at the bottom material feeding device, the transparent material is connected with the transparent material pipe through the cylinder, the bottom material feeding device, the transparent material is arranged at the bottom material feeding device, the transparent material is connected with the transparent material pipe, the material feeding device, the material is arranged at the transparent material and the material feeding device, and the material is connected with the material through the rotary pipe and the material.

4. The process for preparing the high-strength and high-toughness heat-treatment-free aluminum alloy for casting, which is characterized in that: the filtration was performed using a 60 mesh porous ceramic foam filter plate.

5. The process for preparing the high-strength and high-toughness heat-treatment-free aluminum alloy for casting, which is characterized in that: casting is casting, standing for 30min before casting, wherein the casting temperature is 680-720 ℃, and the casting rate is 30-50Hz.