Lightweight casting device based on secondary aluminum

Abstract

The invention belongs to the technical field of vacuum casting, and particularly relates to a light-weight casting device based on secondary aluminum, which comprises a lower die, an upper die and a runner for metal liquid to flow into a die cavity, and silicon dioxide aerogel powder layers are arranged on the runner and the cavity surfaces of the lower die and the upper die. The price of a batch per kilogram in the current market is 80-190 yuan, the cooling time of the metal liquid is prolonged through the arrangement of the silicon dioxide aerogel powder, gas can be effectively exhausted in a vacuum environment after the metal liquid is poured into a mold, and the technical problem that gas cannot be effectively exhausted in the vacuum environment through a traditional gravity casting method is solved. Therefore, workpiece products with better mechanical properties can be obtained at lower cost, and the vacuum casting device is light in weight and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum casting, and in particular relates to a lightweight casting device based on recycled aluminum. Background Art

[0002] Die casting is a casting method with fast workpiece forming speed, high precision and excellent mechanical properties. It is often used in the production and manufacturing of automobile frames. Die casting has high requirements on the quality of molds, and the supporting equipment is expensive.

[0003] Vacuum casting is divided into vacuum suction casting, vacuum die casting and the more advanced full-process vacuum casting. Compared with traditional gravity casting, vacuum casting can effectively reduce the problem of casting defects. However, the current vacuum casting relies on supporting finished product equipment, which is highly integrated and expensive.

[0004] For the small-batch production of aluminum workpieces used in experiments, the user does not know how many sets of workpiece products need to be produced after the mold is opened. The user can only determine the number of workpiece products to be produced based on the progress of the experiment. However, the workpiece products used in the experiment need to improve the quality of the workpiece while reducing the production cost as much as possible, so lightweight casting equipment is needed. Summary of the invention

[0005] To solve the problems raised in the above background technology. The present invention provides a lightweight casting device based on recycled aluminum, which solves the technical problem that the traditional gravity casting method cannot effectively discharge gas in a vacuum environment. Therefore, at a lower cost, a workpiece product with better mechanical properties and a lightweight, low-cost vacuum casting device can be obtained.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a lightweight casting device based on recycled aluminum, comprising a lower mold, an upper mold, and a flow channel for molten metal to flow into the mold cavity, and a silica aerogel powder layer is arranged on the flow channel and the cavity surfaces of the lower mold and the upper mold.

[0007] As a preferred lightweight casting device based on recycled aluminum of the present invention, silica aerogel powder is attached to the cavity surface by a binder.

[0008] As a preferred lightweight casting device based on recycled aluminum of the present invention, silica aerogel powder is attached to the cavity surface by spraying.

[0009] As a preferred lightweight casting device based on recycled aluminum of the present invention, the spraying method is thermal spraying.

[0010] As a preferred lightweight casting device based on recycled aluminum of the present invention, the spraying method is cold spraying.

[0011] As a preferred lightweight casting device based on recycled aluminum of the present invention, guide rods are slidably connected to the inner sides of the four sides of the lower mold and the upper mold, and the bottom of the guide rods is fixedly connected to the bottom plate.

[0012] As a preferred lightweight casting device based on recycled aluminum of the present invention, when the lower mold contacts the base plate and the lower mold contacts the upper mold, a thread is provided at the exposed position of the guide rod, and the thread of the guide rod is threadedly connected to the extrusion piece.

[0013] As a preferred lightweight casting device based on recycled aluminum of the present invention, the extrusion part includes a threaded sleeve threadedly connected to the guide rod, a handle is fixedly connected to the outer side of the threaded sleeve, an extrusion sleeve is fixedly connected to the bottom end of the threaded sleeve, and a plurality of observation holes are opened on the side wall of the extrusion sleeve.

[0014] As a preferred lightweight casting device based on recycled aluminum of the present invention, a guide piece is inserted into the inner side of the flow channel, and the guide piece includes a guide tube, a funnel and a guide nozzle. The two ends of the guide tube are detachably connected to the funnel and the guide nozzle respectively, and a plurality of dividing strips are fixedly connected to the outer surface of the guide tube. A limit block protruding outward is provided at one end of the dividing strip. The end of the guide nozzle connected to the guide tube is circular, and the other end of the guide nozzle is horseshoe-shaped.

[0015] As a preferred lightweight casting device based on recycled aluminum of the present invention, the guide nozzle and the funnel are both composed of two symmetrical structures, a plug hole is provided at the end of the guide tube connected to the guide nozzle, a plug plate is fixedly connected to one end of the guide nozzle, the guide nozzle is connected to the guide tube through the interference fit between the plug plate and the plug hole, the other end of the guide tube is fixedly connected to a pull plate, inclined holes are symmetrically provided on the pull plate, the extension directions of the two inclined holes intersect at the end away from the guide nozzle, an inclined plate is slidably connected to the inclined hole of the pull plate, the bottom ends of the two inclined plates are respectively fixedly connected to the bottom of the two symmetrical structures of the funnel, and the top of the funnel is cooperatively connected to an extrusion frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: since the price of the silica aerogel powder itself is not expensive, the current market price of one kilogram is 80-190 yuan, and the setting of the silica aerogel powder increases the cooling time of the metal liquid, so that the gas can be effectively discharged in a vacuum environment after the metal liquid is poured into the mold, which solves the technical problem that the traditional gravity casting method cannot effectively discharge the gas in a vacuum environment. Therefore, at a lower cost, a workpiece product with better mechanical properties and a lightweight, low-cost vacuum casting device can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 Schematic diagram of the relative positions of the flow channel and the flow guide member in the present invention;

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A;

[0021] Figure 4 It is a schematic diagram of the structure of the extrusion part in the present invention;

[0022] Figure 5 It is a partial cross-sectional view of the installation structure of the guide rod in the present invention;

[0023] Figure 6 It is a schematic diagram of the overall structure of the flow guide member in the present invention;

[0024] Figure 7 It is an exploded view of the overall structure of the flow guide member in the present invention;

[0025] Figure 8 It is a structural schematic diagram of the flow guide pipe in the present invention;

[0026] Fig. 9 It is a cross-sectional view of the overall structure of the flow guide member in the present invention;

[0027] Fig.10 For the present invention Fig. 9 Schematic diagram of the enlarged structure at B;

[0028] In the figure:

[0029] 1. Lower die; 2. Upper die; 3. Bottom plate; 4. Guide rod; 5. Cavity surface; 6. Runner; 7. Extrusion piece; 8. Protective sheet; 9. Flow guide piece;

[0030] 701, threaded sleeve; 702, handle; 703, extrusion sleeve; 704, observation hole;

[0031] 901, flow guide tube; 902, funnel; 903, flow guide nozzle; 904, dividing strip; 905, limit block; 906, plug plate; 907, plug hole; 908, pull plate; 909, inclined hole; 9010, inclined plate; 9011, extrusion frame; 9012, extrusion surface. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-Figure 10 As shown:

[0034] A lightweight casting device based on recycled aluminum comprises a lower mold 1, an upper mold 2 and a flow channel 6 for metal liquid to flow into a mold cavity, wherein a silicon dioxide aerogel powder layer is arranged on the flow channel 6 and the cavity surfaces 5 of the lower mold 1 and the upper mold 2.

[0035] In this embodiment, die casting is a casting method with fast workpiece forming speed, high precision and excellent mechanical properties, and is commonly used in the production and manufacturing of automobile frames. Die casting has high requirements on the quality of the mold, and the supporting equipment is expensive;

[0036] Vacuum casting is divided into vacuum suction casting, vacuum die casting and the more advanced full-process vacuum casting. Compared with traditional gravity casting, vacuum casting can effectively reduce the problem of casting defects. However, the current vacuum casting relies on supporting finished product equipment, which is highly integrated and expensive.

[0037] For the aluminum workpieces produced in small batches for experiments, the user is not clear about how many sets of workpiece products need to be produced after the mold is opened. The user can only determine the number of workpiece products to be produced according to the progress of the experiment. However, the workpiece products used in the experiment need to improve the quality of the workpieces while reducing the production cost as much as possible.

[0038] High-pressure casting can make the molten metal have stronger fluidity and filling ability under high pressure, and can quickly and smoothly fill every corner of the mold cavity. Especially for castings with complex structures and thin walls, high pressure can ensure that the molten metal completely fills the cavity before solidification, reducing the lack of material. In addition, the high pressure can help eliminate defects such as pores and shrinkage inside the casting, making the metal grain structure finer and denser, thereby improving the density and mechanical properties of the casting. In traditional gravity casting, due to the relatively slow filling speed, the molten metal may have defects such as flow marks and cold shuts during the filling process, affecting the casting. Surface quality and internal structural integrity. For some castings with complex shapes and thin-walled structures, casting may not be able to fill the cavity well, resulting in problems such as lack of material and unclear contours in the casting, which in turn reduces the structural strength. During the cooling process of the workpiece, the part in contact with the mold will cool first. As the cooling continues, the center of the workpiece will have a lower density due to thermal expansion and contraction, resulting in shrinkage. Due to the uneven density distribution, cold shut occurs, affecting the mechanical properties of the workpiece product. Pressure casting can avoid shrinkage and cold shut under the condition of continuous pressure.

[0039] The present invention arranges a silica aerogel powder layer at the cavity surface 5, and the thermal conductivity thereof is very low, usually in the range of 0.02-0.03W / (m·K), which is much lower than most traditional thermal insulation materials. There are nano-scale pores inside, and the porosity is as high as 80%-99.8%. When heat tries to pass through, it must first pass through the air in these pores, and the air has a very large barrier effect on heat, thereby effectively preventing the transfer of heat. In addition, the silica aerogel powder can withstand high temperatures of 1100°C-1400°C. Depending on the other components contained in the aluminum alloy, the melting point of the aluminum alloy is between 577°C-660°C, and the temperature range in which the aluminum alloy has good fluidity is between 750°C-950°C. Therefore, when the silica aerogel powder layer is arranged on the cavity surface 5, it is suitable for casting aluminum workpieces;

[0040] During the casting process, a release agent is applied to the silica aerogel powder layer, the lower mold 1 and the upper mold 2 are docked at a standard pressure, and then the aluminum metal liquid is poured into the cavity surface 5 through the runner 6. After the metal liquid is poured, it is placed in the vacuum environment of the vacuum machine. In the vacuum environment, the tiny bubbles in the metal liquid and the air in the gap between the metal liquid and the mold will be discharged, thereby improving the quality of workpiece molding. However, for traditional gravity casting, the mold with the metal liquid poured into it is placed in a vacuum environment, and the gas discharge is very limited. This is because the effective gas discharge time is generally 1-1.5 hours, and the traditional gravity casting begins to solidify within 5-10 minutes. After this time, the bubbles in the metal liquid cannot be discharged in a vacuum environment. The main reason for the accelerated solidification time of the metal liquid is that the temperature of the mold itself is low, and the mold itself has good thermal conductivity and fast heat dissipation speed. Therefore, the heat of the metal liquid will be quickly transferred to the mold, the solidification time will be shortened, and the cooling time of the metal liquid cannot be slowed down by heating the mold. This will cause deformation of the mold and defects on the cavity surface 5, and ultimately damage the mold.

[0041] A silica aerogel powder layer is provided on the cavity surface 5 of the mold, so that the heat dissipation area of ​​the metal liquid is directly reduced to only the diameter of the flow channel 6, so that the metal liquid can be in a molten state for a long time under a vacuum environment, and the temperature reduction rate is significantly slowed down, so that the gas in the metal liquid can be effectively discharged. In addition, since the cooling and solidification time is increased, the time for the volume of the metal liquid to decrease during the cooling process is increased, which can further improve the uneven stress distribution inside the metal workpiece caused by the accelerated cooling time, improve the mechanical properties of the workpiece, and can be better used for experimental purposes;

[0042] Since the price of silica aerogel powder itself is not expensive, the current market price of one kilogram is 80-190 yuan. The setting of silica aerogel powder increases the cooling time of the metal liquid, so that the gas can be effectively discharged in a vacuum environment after the metal liquid is poured into the mold, which solves the technical problem that the traditional gravity casting method cannot effectively discharge the gas in a vacuum environment. Therefore, at a lower cost, workpiece products with better mechanical properties and lightweight, low-cost vacuum casting equipment can be obtained.

[0043] In an optional embodiment, the silica aerogel powder is attached to the cavity surface 5 by an adhesive, and high temperature resistant silicone glue or epoxy glue is selected as the adhesive. When bonding the silica aerogel powder, the cavity surface 5 must first be treated and cleaned to remove oil and impurities. Then, the adhesive is evenly applied to the metal surface, and the silica aerogel powder is evenly sprinkled on the adhesive. Press gently to make the powder fully contact with the adhesive to ensure firm bonding, and then cure under the temperature and time conditions required by the adhesive.

[0044] In an optional embodiment, the silica aerogel powder is attached to the cavity surface 5 by spraying. The spraying method does not require the use of a binder, so that the silica aerogel powder is directly attached to the cavity surface 5 .

[0045] In an optional embodiment, the spraying method is thermal spraying, which is to heat the silica aerogel powder to a semi-molten state to make it have good fluidity and adhesion, and spray it onto the cavity surface 5 with a high-speed airflow. The powder is quickly cooled and solidified on the cavity surface 5 to form a strong coating.

[0046] In an optional embodiment, the spraying method is cold spraying. Cold spraying is to accelerate aerogel powder to a high speed at room temperature using high-pressure gas, so that the powder hits the metal surface at an extremely high speed, and is fixed to the metal surface through mechanical bite and physical adsorption, generally reaching supersonic speed, so that the powder hits the metal surface with great kinetic energy, and is tightly attached to the metal surface through mechanical bite, deformation embedding and physical adsorption without obvious melting. At present, the application field of the spraying method is that in the aerospace field, in order to provide efficient thermal insulation protection for the metal parts of the aircraft, thermal spraying technology is often used to spray silica aerogel powder on the metal skin and other parts, which effectively reduces the high temperature generated by aerodynamic heating when the aircraft is flying at high speed. The impact on the metal structure; in the field of heat dissipation of electronic equipment, the metal casing of some high-end electronic equipment is cold-sprayed with silica aerogel powder to form a coating with good thermal insulation properties, which can prevent excessive heat loss inside the equipment and avoid external heat transmission, thereby improving the stability and reliability of the equipment.

[0047] In an optional embodiment, guide rods 4 are slidably connected to the inner sides of the lower mold 1 and the upper mold 2, and the bottom of the guide rods 4 is fixedly connected to the bottom plate 3. The guide rods 4 are fixed by the bottom plate 3 to determine the position of the guide rods 4.

[0048] In an optional embodiment, when the lower mold 1 contacts the base plate 3 and the lower mold 1 contacts the upper mold 2, a thread is provided at the exposed position of the guide rod 4, and the thread of the guide rod 4 is threadedly connected to the extrusion piece 7. By rotating the extrusion piece 7, the extrusion piece 7 can apply pressure to the upper mold 2, so that the upper mold 2 fits tightly with the lower mold 1. In order to avoid damage to the surface of the upper mold 2 when the extrusion piece 7 squeezes the upper mold 2, a protective sheet 8 is fixedly connected to the top surface of the upper mold 2, and the bottom of the extrusion piece 7 is directly in contact with the protective sheet 8, and the extrusion force is transmitted to the upper mold 2 through the protective sheet 8.

[0049] In an optional embodiment, the extrusion member 7 includes a threaded sleeve 701 threadedly connected to the guide rod 4, a handle 702 is fixedly connected to the outer side of the threaded sleeve 701, an extrusion sleeve 703 is fixedly connected to the bottom end of the threaded sleeve 701, and a plurality of observation holes 704 are provided on the side wall of the extrusion sleeve 703. The handle 702 is provided to facilitate driving the threaded sleeve 701 to rotate. The rotation of the threaded sleeve 701 will drive the extrusion sleeve 703 to move along the guide rod 4. The bottom of the extrusion sleeve 703 can extrude the protective sheet 8. The observation holes 704 are provided to facilitate observing the internal conditions of the extrusion sleeve 703.

[0050] In an optional embodiment, a flow guide 9 is inserted into the inner side of the flow channel 6, and the flow guide 9 includes a flow guide tube 901, a funnel 902 and a flow guide nozzle 903. The two ends of the flow guide tube 901 are detachably connected to the funnel 902 and the flow guide nozzle 903, respectively. A plurality of partition bars 904 are fixedly connected to the outer surface of the flow guide tube 901, and a limit block 905 protruding outward is provided at one end of the partition bar 904. The end of the flow guide nozzle 903 connected to the flow guide tube 901 is round, and the flow guide nozzle 903 is The other end is horseshoe-shaped, and the horseshoe includes an arc segment with a large radius and a small radius. The two arc segments are connected by an arc transition segment, and the arc segment with a small radius coincides with the extended line of the axis of the flow channel 6. That is to say, the arc segment with a small radius of the flow guide nozzle 903 has the same radius as one end of the circle of the flow guide nozzle 903, and the center of the circle is on the extended line of the axis of the flow guide tube 901. Then, there is a large gap between the arc segment with a large radius of the flow guide nozzle 903 and the flow channel 6, and the metal liquid flows along the arc segment. When the guide nozzle 903 flows downward, affected by the horseshoe structure of the guide nozzle 903, the metal liquid will flow down along one side of the flow channel 6 after flowing out of the guide nozzle 903, that is, it will flow down along the flow channel 6 at the small radius arc section of the horseshoe shape close to the guide nozzle 903, which is beneficial to the discharge of gas inside the cavity, thereby avoiding the metal liquid from completely blocking the flow channel 6 when flowing downward, and inserting the guide member 9 into the flow channel 6. Specifically, a part of the guide tube 901 is inserted into the flow channel 6, and the dividing strip 904 is directly in contact with the inner wall of the flow channel 6. The limit block 905 is set to directly contact the outer surface of the upper mold 2. The limit block 905 can better control the descending height of the guide tube 901. The dividing strip 904 is set to achieve a gap for exhaust between the flow channel 6 and the guide tube 901, so that the air inside the cavity is easy to discharge, which is beneficial to the flow of metal liquid into the cavity. On the basis of lightweight casting equipment, the quality of the workpiece during casting is further improved.

[0051] In an optional embodiment, the guide nozzle 903 and the funnel 902 are both composed of two symmetrical structures. A plug hole 907 is provided at one end of the guide tube 901 that is connected to the guide nozzle 903. A plug plate 906 is fixedly connected to one end of the guide nozzle 903. The guide nozzle 903 is connected to the guide tube 901 through an interference fit between the plug plate 906 and the plug hole 907. A pull plate 908 is fixedly connected to the other end of the guide tube 901. The pull plate 908 is symmetrically provided with inclined holes 909. The extension directions of the two inclined holes 909 intersect at the end away from the guide nozzle 903. An inclined plate is slidably connected to the inclined hole 909 of the pull plate 908. 9010, the bottom ends of the two inclined plates 9010 are respectively fixedly connected to the bottoms of the two symmetrical structures of the funnel 902, and the top of the funnel 902 is matched with an extrusion frame 9011. The extrusion surface 9012 of the extrusion frame 9011 in contact with the outer side of the top of the funnel 902 is inclined. After the extrusion frame 9011 contacts the funnel 902, the greater the distance the extrusion frame 9011 moves toward the guide tube 901, the greater the radial extrusion force applied by the extrusion frame 9011 to the open part of the funnel 902 through the extrusion surface 9012, thereby achieving the compression of the open part of the funnel 902 by the extrusion frame 9011;

[0052] In this embodiment, the structure of the guide nozzle 903 with a larger top and a smaller bottom is conducive to the discharge of air in the mold cavity and improves the quality of workpiece casting. However, the disadvantages are also obvious. After pouring in the molten metal, if too much molten metal is poured in, so that the liquid level of the molten metal submerges the guide nozzle 903 and even submerges a part of the funnel 902, then when opening the mold, the guide member 9 will directly affect the movement of the upper mold 2. The guide member 9 must be removed and the metal exposed outside the runner 6 must be cut. Therefore, a part of the guide tube 901 must be located on the inside of the runner 6, and the other part needs to be located on the outside of the runner 6. Assuming that when pouring the molten metal, the liquid level of the molten metal submerges a part of the funnel 902, after the molten metal solidifies, remove the extrusion frame 9011, and then knock on the two parts of the funnel 902 respectively to move the funnel 902 toward the guide nozzle 903. When the funnel 902 moves, the funnel 902 will drive the inclined plate 90 10 moves along the inclined hole 909. During the movement, the two parts of the funnel 902 will move away from each other. During this process, the inner wall surface of the bottom of the funnel 902 will also separate from the outer surface of the pulling plate 908 and will not contact each other until the inclined plate 9010 is completely separated from the inclined hole 909, thereby realizing the disassembly of the funnel 902. Then, the metal previously located in the funnel 902 is cut, and the guide tube 901 is pulled out. The pulling plate 908 is provided to facilitate the pulling out of the guide tube 901. When the guide tube 901 is pulled out, the guide tube 901 will be separated from the guide nozzle 903. Specifically, the guide tube 901 will be separated from the plug plate 906, so that the guide nozzle 903 remains in the flow channel 6. Then, the upper mold 2 can be removed, and the metal previously located in the flow channel 6 is cut to separate the part of the metal from the workpiece. Then, the metal around the guide nozzle 903 is cut. The separation of the two parts of the guide nozzle 903 facilitates the disassembly between the guide nozzle 903 and the metal.

[0053] The funnel 902 of the guide member 9 is on the top, and the guide nozzle 903 is on the bottom. When the guide member 9 is assembled, the two parts of the guide nozzle 903 are assembled, and then the plug plate 906 is inserted into the plug hole 907. The two parts of the funnel 902 are inserted into the inclined hole 909 from bottom to top through the inclined plate 9010 until the inner wall of the funnel 902 contacts the annular outer surface of the pull plate 908. When the funnel 902 continues to move upward, the contact pressure between the funnel 902 and the pull plate 908 will increase, and the contact pressure between the two parts of the funnel 902 will also increase. As the pressure increases, the friction between the pull plate 908 and the inner wall of the funnel 902 will increase, and the friction between the inclined plate 9010 and the inclined hole 909 will increase. The friction force will also increase, thereby achieving stable fixation of the funnel 902. When the funnel 902 is installed, the pull plate 908 and the funnel 902 will be in close contact without a gap, and the two parts of the funnel 902 will also be in close contact to prevent leakage of metal liquid. In order to further improve the sealing between the two parts of the funnel 902, the extrusion frame 9011 is moved from top to bottom, so that the extrusion surface 9012 of the extrusion frame 9011 is in close extrusion contact with the outside of the open part of the funnel 902. As the extrusion frame 9011 moves downward, the greater the pressure applied by the extrusion surface 9012 to the open outer surface of the funnel 902, the further the sealing of the two parts of the funnel 902 when they are connected.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lightweight casting device based on recycled aluminum, comprising a lower mold (1), an upper mold (2) and a flow channel (6) for metal liquid to flow into a mold cavity, characterized in that: A silicon dioxide aerogel powder layer is provided on the flow channel (6) and the cavity surfaces (5) of the lower mold (1) and the upper mold (2).

2. The lightweight casting device based on recycled aluminum according to claim 1, characterized in that: The silicon dioxide aerogel powder is attached to the cavity surface (5) by means of a binder.

3. The lightweight casting device based on recycled aluminum according to claim 1, characterized in that: The silicon dioxide aerogel powder is attached to the cavity surface (5) by spraying.

4. The lightweight casting device based on recycled aluminum according to claim 3, characterized in that: The spraying method is thermal spraying.

5. The lightweight casting device based on recycled aluminum according to claim 3, characterized in that: The spraying method is cold spraying.

6. The lightweight casting device based on recycled aluminum according to claim 1, characterized in that: The inner sides of the lower mold (1) and the upper mold (2) are slidably connected with guide rods (4), and the bottom of the guide rods (4) is fixedly connected with a bottom plate (3).

7. The lightweight casting device based on recycled aluminum according to claim 6, characterized in that: When the lower die (1) contacts the bottom plate (3) and the lower die (1) contacts the upper die (2) with each other, a thread is provided at the exposed position of the guide rod (4), and the thread of the guide rod (4) is threadedly connected to the extrusion piece (7).

8. The lightweight casting device based on recycled aluminum according to claim 7, characterized in that: The extrusion member (7) comprises a threaded sleeve (701) threadedly connected to the guide rod (4); a handle (702) is fixedly connected to the outer side of the threaded sleeve (701); an extrusion sleeve (703) is fixedly connected to the bottom end of the threaded sleeve (701); and a plurality of observation holes (704) are provided on the side wall of the extrusion sleeve (703).

9. The lightweight casting device based on recycled aluminum according to claim 1, characterized in that: A flow guide member (9) is inserted into the inner side of the flow channel (6), and the flow guide member (9) comprises a flow guide tube (901), a funnel (902) and a flow guide nozzle (903). The two ends of the flow guide tube (901) are detachably connected to the funnel (902) and the flow guide nozzle (903), respectively. A plurality of partition bars (904) are fixedly connected to the outer surface of the flow guide tube (901), and one end of the partition bar (904) is provided with a limit block (905) protruding outward. The end of the flow guide nozzle (903) connected to the flow guide tube (901) is circular, and the other end of the flow guide nozzle (903) is horseshoe-shaped.

10. The lightweight casting device based on recycled aluminum according to claim 9, characterized in that: The flow guide nozzle (903) and the funnel (902) are both composed of two symmetrical structures. A plug hole (907) is provided at one end of the flow guide tube (901) where the flow guide nozzle (903) is connected. A plug plate (906) is fixedly connected to one end of the flow guide nozzle (903). The flow guide nozzle (903) is connected to the flow guide tube (901) through an interference fit between the plug plate (906) and the plug hole (907). A pull plate is fixedly connected to the other end of the flow guide tube (901). (908), inclined holes (909) are symmetrically provided on the pull plate (908), and the extension directions of the two inclined holes (909) intersect at one end away from the guide nozzle (903), and an inclined plate (9010) is slidably connected to the inclined hole (909) of the pull plate (908), and the bottom ends of the two inclined plates (9010) are respectively fixedly connected to the bottoms of the two symmetrical structures of the funnel (902), and the top end of the funnel (902) is cooperatively connected with an extrusion frame (9011).

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