Preparation method of high-thermal-conductivity cast aluminum alloy

Abstract

The invention relates to the field of aluminum alloy preparation, in particular to a preparation method of a high-heat-conductivity cast aluminum alloy, which comprises a filtering mechanism comprising a support frame and a rotational flow pipeline arranged on one side of the support frame and used for conveying molten aluminum alloy, according to the aluminum alloy rotational flow conveying device, two rotational flow guide plates are arranged in the rotational flow pipeline, the rotational flow guide plates on the upper portion conduct rotational flow conveying on the aluminum alloy liquid, the rotational flow filtering assembly used for filtering the aluminum alloy liquid is arranged in the rotational flow pipeline, and the filtering box communicates with the lower end of the rotational flow pipeline. And finally, heavier impurities mixed in the aluminum alloy liquid are thrown to the wall surface of the cavity under the action of centrifugal force through a rotational flow guide plate below, and then slide into the chute along the wall surface, so that the aluminum alloy liquid is subjected to primary filtering treatment. And the condition that follow-up filtering is difficult due to the fact that a large number of impurities in the aluminum alloy liquid are accumulated on the ceramic filtering plate is reduced.

Description

Technical Field

[0001] The present invention relates to the field of aluminum alloy preparation, and more specifically, it relates to a method for preparing a high thermal conductivity cast aluminum alloy. Background Art

[0002] In the field of aluminum alloy preparation, especially in the field of cast aluminum alloys pursuing high thermal conductivity, traditional preparation methods and filtration technologies face many challenges. With the continuous progress of industrial technology and the continuous expansion of applications, higher requirements are put forward for the thermal conductivity, purity, and mechanical properties of aluminum alloy materials. However, in the key processes of melting, refining, filtration, and pouring of existing cast aluminum alloy preparation methods, it is often difficult to effectively remove tiny inclusions and dissolved gases in the aluminum alloy liquid, thereby affecting the thermal conductivity and mechanical properties of the final castings.

[0003] Although existing filtration equipment for cast aluminum alloys has many advantages, there are still certain limitations in actual use. Although traditional ceramic filter plates can remove inclusions in the aluminum alloy liquid to a certain extent, as the filtration process progresses, impurities are prone to accumulate on the ceramic filter plates, resulting in a gradual decrease in filtration efficiency. This not only increases the filtration cost but also affects the quality stability of the castings. To solve the above problems, a method for preparing a high thermal conductivity cast aluminum alloy is proposed. Summary of the Invention

[0004] (I) Technical Problems to be Solved In view of the problems existing in the prior art, the present invention provides a method for preparing a high thermal conductivity cast aluminum alloy to solve the problem that although traditional ceramic filter plates can remove inclusions in the aluminum alloy liquid to a certain extent, as the filtration process progresses, impurities are prone to accumulate on the ceramic filter plates, resulting in a gradual decrease in filtration efficiency. This not only increases the filtration cost but also affects the quality stability of the castings mentioned in the background art.

[0005] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solution: A method for preparing a high thermal conductivity cast aluminum alloy, comprising the following steps: 1) Loading and melting: Add pure aluminum ingots to a furnace, heat up to 700 - 750 °C for melting, then add Al - Si master alloy, stir until completely melted, and then add Al - Cu, Al - Mg and other master alloys in batches to obtain aluminum alloy liquid; 2) Flux refining: Press a refining agent (such as C2Cl6) to the bottom of the aluminum liquid, stir through a degassing device and then let it stand for 10 - 15 minutes to make inclusions float; 3) Gas refining: Then introduce an inert gas (N2 or Ar), form bubbles through a rotating nozzle to adsorb hydrogen and impurities; 4) Ceramic filtration: Use a foam ceramic filter plate (pore size 10 - 40 PPI) to filter the molten aluminum and remove the tiny inclusions in the aluminum alloy liquid; 5) Casting and molding: Preheat the sand mold or metal mold to 200 - 300 °C to prevent cracks caused by the rapid cooling of the molten aluminum. At the same time, control the pouring temperature: 700 - 720 °C (sand casting) or 680 - 700 °C (metal mold casting). Finally, demold after cooling and forming to obtain the high - thermal - conductivity aluminum alloy.

[0006] The present invention is further configured such that in the process of step 4), it is completed by the following filtration equipment, including a filtration mechanism, which includes a support frame and a swirling pipeline arranged on one side of the support frame for conveying the aluminum alloy liquid. A swirling filtration component for filtering the aluminum alloy liquid is arranged inside the swirling pipeline. The lower end of the swirling pipeline is communicated with a filtration box, and an anti - covering filtration component for filtering the flowing - in aluminum alloy liquid is arranged inside the filtration box. A filtration auxiliary mechanism is arranged above the filtration box; The filtration auxiliary mechanism includes a limiting cylinder arranged above the filtration box. A pressurization component for pressurizing the aluminum alloy liquid is arranged inside the limiting cylinder, and an acceleration component for accelerating the aluminum alloy liquid is arranged inside the swirling pipeline.

[0007] The present invention is further configured such that the swirling filtration component includes a feeding channel arranged above the swirling pipeline. The lower end of the feeding channel is communicated with the upper end of the swirling pipeline. The inner wall of the swirling pipeline is provided with two groups of swirling guiding plates. The lower end of the swirling pipeline is communicated with the filtration box. An inclined groove is opened on the inner wall of the lower end of the swirling pipeline. A slag discharge valve is communicated with one side of the lower end of the swirling pipeline close to the filtration box. The inclination degree of one side of the inclined groove close to the slag discharge valve is the largest. The lower end of the side of the filtration box far from the swirling pipeline is communicated with a discharge channel, and a recovery box is arranged below the slag discharge valve.

[0008] The present invention is further configured such that the anti - covering filtration component includes a servo motor arranged on one side of the filtration box. A transmission rod is installed at the output end of the servo motor. A first pulley is fixedly installed at the upper end of the transmission rod. A square ceramic filter plate is detachably installed in the middle of the inner cavity of the filtration box. A semi - circular ceramic filter plate is arranged above the square ceramic filter plate.

[0009] The present invention is further configured such that a first rotating rod is fixedly installed in the middle of the upper end of the semi - circular ceramic filter plate. A second pulley is fixedly installed at the upper end of the first rotating rod. The first pulley and the second pulley are flush, and the first pulley and the second pulley are connected by a transmission belt. The lower end of the semi - circular ceramic filter plate is in contact with the upper end of the square ceramic filter plate.

[0010] The present invention is further configured such that the pressurizing assembly includes a fixed frame disposed on one side of the limiting cylinder. The fixed frame is arranged above the filter tank. A ceramic piston rod is fixedly installed in the middle of the fixed frame. An eccentric wheel is fixedly installed at the upper end of the transmission rod. One side of the eccentric wheel close to the swirl pipe is rotatably connected to the lower end of the fixed frame through a hinge seat.

[0011] The present invention is further configured such that the size of the ceramic piston rod is adapted to the inner cavity size of the limiting cylinder, and the inner cavity of the limiting cylinder is movably connected to the ceramic piston rod. Both ends of the limiting cylinder are open, and one end of the limiting cylinder is communicated with the upper end of the swirl pipe. A one-way valve is communicated on one side of the ceramic piston rod close to the fixed frame.

[0012] The present invention is further configured such that the acceleration assembly includes a second rotating rod disposed in the inner cavity of the swirl pipe. A gear is fixedly installed at the upper end of the second rotating rod. A rack is fixedly installed at the upper end of the fixed frame. A plurality of fan blades are detachably installed at the lower end of the second rotating rod, and the fan blades are annularly distributed. The rack is arranged on the front side of the gear, and the rack meshes with the gear. One end of the rack away from the limiting cylinder is movably connected to the support frame.

[0013] (III) Beneficial effects Compared with the prior art, the present invention provides a preparation method of a high thermal conductivity cast aluminum alloy, having the following beneficial effects: The present invention can both make the upper swirl guiding plate perform swirl transportation on the aluminum alloy liquid through the two-stage swirl guiding plates arranged inside the swirl pipe, and finally make the heavier impurities mixed in the aluminum alloy liquid be thrown towards the cavity wall under the action of centrifugal force by the lower swirl guiding plate. The heavier impurities then slide down along the wall to the chute, thereby performing a primary filtration treatment on the aluminum alloy liquid, reducing the situation that a large amount of impurities in the aluminum alloy liquid accumulate on the ceramic filter plate, resulting in subsequent filtration difficulties, and thus ensuring the filtration effect on the aluminum alloy liquid.

[0014] It can also drive the semi-circular ceramic filter plate to rotate, thereby applying centrifugal force to the impurities falling on the semi-circular ceramic filter plate and throwing off the impurities, thus reducing the situation that the impurities accumulate and cover the semi-circular ceramic filter plate, resulting in a decrease in the filtration effect, and further improving the filtration effect on the aluminum alloy liquid. It can also, during the rotation of the transmission rod, make the ceramic piston rod pressurize and push the aluminum alloy liquid in the swirl pipe, further increasing the flow rate of the aluminum alloy liquid in the swirl pipe, and at the same time increasing the tangential velocity of the aluminum alloy liquid and enhancing the centrifugal force, so that the inclusions with a larger density in the aluminum alloy liquid (such as alumina and flux inclusions) are more effectively thrown towards the pipe wall, thereby ensuring the swirl filtration effect.

[0015] During the movement of the fixed frame, the fan blades on the second rotating rod can be rotated at the vertical direction of the swirling pipeline, thereby increasing the flow velocity of the aluminum alloy liquid in the vertical direction of the swirling pipeline, eliminating the swirling dead zone, making the distribution of the aluminum alloy liquid in the cavity more uniform. At the same time, the rotating fan blades can generate local turbulence in the flowing aluminum alloy liquid, destroying the mixing layer between the impurities and the aluminum alloy liquid, further promoting the migration of impurities to the wall surface, and improving the swirling filtration effect in the swirling pipeline again. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic front view structure diagram of the present invention.

[0018] Figure 3 It is a schematic diagram of the internal structure of the filter box of the present invention.

[0019] Figure 4 It is a schematic diagram of the internal structure of the swirling pipeline of the present invention.

[0020] Figure 5 It is a schematic diagram of the structures of the pressurizing component and the anti-covering filtering component of the present invention.

[0021] Figure 6 It is a schematic diagram of the structures of the pressurizing component and the accelerating component of the present invention.

[0022] Figure 7 It is a schematic bottom view structure diagram of the pressurizing component of the present invention.

[0023] Figure 8 It is a schematic side view structure diagram of the ceramic piston rod and the one-way valve of the pressurizing component of the present invention.

[0024] In the figure: 100, filtering mechanism; 101, swirling pipeline; 102, feeding channel; 103, support frame; 104, swirling guide plate; 105, inclined chute; 106, slag discharge valve; 107, recycling box; 108, filter box; 109, discharge channel; 110, servo motor; 111, transmission rod; 112, first pulley; 113, transmission belt; 114, second pulley; 115, first rotating rod; 116, semi-circular ceramic filter plate; 117, square ceramic filter plate; 200, filtering auxiliary mechanism; 201, fixed frame; 202, limiting cylinder; 203, ceramic piston rod; 204, eccentric wheel; 205, hinge seat; 206, one-way valve; 207, rack; 208, second rotating rod; 209, gear; 210, fan blade. Detailed Embodiments

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0027] In the present invention, unless otherwise stated, the directions such as "upper, lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are usually the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contours of the respective components, but the above directional terms are not used to limit the present invention.

[0028] Embodiment, a preparation method of a high thermal conductivity cast aluminum alloy, which is characterized by comprising the following steps: 1) Loading and melting: Add pure aluminum ingots into the furnace, heat up to 700 - 750 °C for melting, then add Al - Si master alloy, stir until completely melted, and then add Al - Cu, Al - Mg and other master alloys in batches to obtain aluminum alloy liquid; 2) Flux refining: Press the refining agent (such as C2Cl6) to the bottom of the aluminum liquid, stir through the degassing equipment and then stand for 10 - 15 minutes to make the inclusions float; 3) Gas refining: Then introduce an inert gas (N2 or Ar), form bubbles through a rotating nozzle to adsorb hydrogen and impurities; 4) Ceramic filtration: Use a foam ceramic filter plate (pore size 10 - 40 PPI) to filter the aluminum liquid to remove tiny inclusions in the aluminum alloy liquid; 5) Pouring and molding: Preheat the sand mold or metal mold to 200 - 300 °C to prevent the aluminum liquid from being rapidly cooled to generate cracks, and at the same time control the pouring temperature: 700 - 720 °C (sand casting) or 680 - 700 °C (metal mold casting), and finally demold after cooling and forming to obtain a high thermal conductivity aluminum alloy.

[0029] Please refer to Figure 1 - Figure 8 , in the process of step 4), it is completed by the following filtering equipment, including a filtering mechanism 100, which includes a support frame 103, and a swirl pipeline 101 arranged on one side of the support frame 103 for conveying the aluminum alloy liquid. A swirl filtering component for filtering the aluminum alloy liquid is arranged inside the swirl pipeline 101. The lower end of the swirl pipeline 101 is communicated with a filtering box 108. An anti - covering filtering component for filtering the incoming aluminum alloy liquid is arranged inside the filtering box 108. A filtering auxiliary mechanism 200 is arranged above the filtering box 108; The filtering auxiliary mechanism 200 includes a limiting cylinder 202 arranged above the filtering box 108. A pressurizing assembly for pressurizing the aluminum alloy liquid is arranged inside the limiting cylinder 202, and an accelerating assembly for accelerating the aluminum alloy liquid is arranged inside the swirl pipeline 101.

[0030] In this embodiment, the refined aluminum alloy liquid is conveyed through the swirl pipeline 101, and then the swirl filtering assembly arranged inside the swirl pipeline 101 generates a swirling motion for the aluminum alloy liquid. The heavier impurities mixed in the aluminum alloy liquid are thrown towards the cavity wall under the action of centrifugal force. The heavier impurities then slide down along the wall to the inclined groove 105, and finally the preliminarily filtered aluminum alloy liquid is discharged into the filtering box 108 through the swirl pipeline 101. The aluminum alloy liquid is filtered again by the ceramic filter plate in the filtering box 108. At the same time, the anti-covering filtering assembly is cooperated to reduce the accumulation and covering of impurities on the ceramic filter plate, further improving the filtering effect on the aluminum alloy liquid. And during the process of the aluminum alloy liquid passing through the swirl pipeline 101, the aluminum alloy liquid is pressurized by the pressurizing assembly, further increasing the flow rate of the aluminum alloy liquid in the swirl pipeline 101, increasing the tangential velocity and enhancing the centrifugal force, so that the inclusions with larger density in the aluminum alloy liquid (such as alumina and flux inclusions) are more effectively thrown towards the pipe wall. With the arrangement of the accelerating assembly, the flow rate of the aluminum alloy liquid in the vertical direction of the swirl pipeline 101 can be increased, thereby eliminating the swirl dead zone, making the aluminum alloy liquid more evenly distributed in the cavity. At the same time, the rotating fan blades 210 can generate local turbulence in the flowing aluminum alloy liquid, destroying the mixing layer of impurities and the aluminum alloy liquid, and further promoting the migration of impurities towards the wall.

[0031] Specifically, the swirl filtering assembly includes a feed channel 102 arranged above the swirl pipeline 101. The lower end of the feed channel 102 is communicated with the upper end of the swirl pipeline 101. The inner wall of the swirl pipeline 101 is provided with swirl guiding plates 104. The swirl guiding plates 104 are arranged in two groups. The lower end of the swirl pipeline 101 is communicated with the filtering box 108. The inner wall of the lower end of the swirl pipeline 101 is provided with an inclined groove 105. One side of the inclined groove 105 close to the slag discharge valve 106 has the largest inclination. The lower end of the side of the filtering box 108 away from the swirl pipeline 101 is communicated with a discharge channel 109. A recovery box 107 is arranged below the slag discharge valve 106.

[0032] In this embodiment, the swirl guide plate 104 is fixed to the inner wall of the swirl pipe 101 by welding. During filtration, the aluminum alloy liquid is first guided into the swirl pipe 101 through the feed channel 102, and then the aluminum alloy liquid is guided by the swirl guide plate 104 on the inner wall of the swirl pipe 101 to make the aluminum alloy liquid produce a swirl motion, and the two sections of swirl guide plates 104 are arranged inside the swirl pipe 101, so that the upper swirl guide plate 104 performs swirl conveying on the aluminum alloy liquid, and finally The heavier impurities contained in the aluminum alloy liquid are thrown toward the cavity wall by the swirl guide plate 104 below under the action of centrifugal force, and the heavier impurities then slide down along the wall to the chute 105, thereby performing the initial filtration treatment on the aluminum alloy liquid, thereby reducing the situation in which a large amount of impurities in the aluminum alloy liquid accumulate on the ceramic filter plate, causing difficulties in subsequent filtration, thereby ensuring the filtering effect of the aluminum alloy liquid, and then the impurities are discharged through the slag discharge valve 106 connected to the bottom of the chute 105 and collected in the recovery box 107.

[0033] It is worth noting that the anti-covering filter assembly includes a servo motor 110 arranged on one side of the filter box 108, and a transmission rod 111 is installed at the output end of the servo motor 110, and a first pulley 112 is fixedly installed at the upper end of the transmission rod 111, and a square ceramic filter plate 117 is detachably installed in the middle part of the inner cavity of the filter box 108, and a semicircular ceramic filter plate 116 is arranged above the square ceramic filter plate 117, and a first rotating rod 115 is fixedly installed in the middle part of the upper end of the semicircular ceramic filter plate 116, and a second pulley 114 is fixedly installed on the upper end of the first rotating rod 115, and the first pulley 112 is flush with the second pulley 114, and the first pulley 112 and the second pulley 114 are connected by a transmission belt 113, and the lower end of the semicircular ceramic filter plate 116 is in contact with the upper end of the square ceramic filter plate 117.

[0034] In this embodiment, after the preliminarily filtered aluminum alloy liquid is discharged into the filter box 108, the incoming aluminum alloy liquid is filtered again by the cooperation of the superimposed semi-circular ceramic filter plate 116 and the square ceramic filter plate 117 in the filter box 108. At the same time, the servo motor 110 is turned on, and the servo motor 110 drives the transmission rod 111 to rotate. The first pulley 112 on the transmission rod 111 will rotate accordingly. The first pulley 112 drives the second pulley 114 to rotate through the transmission belt 113, and the second pulley 114 drives the first rotating rod 115 to rotate, thereby driving the semi-circular ceramic filter plate 116 to rotate, and then applying a centrifugal force to the impurities falling on the semi-circular ceramic filter plate 116 to throw off the impurities, thus reducing the situation that the filter effect decreases due to the accumulation and coverage of impurities on the semi-circular ceramic filter plate 116, and further improving the filtering effect of the aluminum alloy liquid. Finally, the filtered aluminum alloy liquid is discharged through the discharge channel 109 and enters the next casting and forming stage.

[0035] Further, the pressurizing assembly includes a fixing frame 201 disposed on one side of the limiting cylinder 202. The fixing frame 201 is disposed above the filter box 108. A ceramic piston rod 203 is fixedly installed in the middle of the fixing frame 201. An eccentric wheel 204 is fixedly installed at the upper end of the transmission rod 111. The side of the eccentric wheel 204 close to the swirl pipe 101 is rotatably connected to the lower end of the fixing frame 201 through a hinge seat 205. The size of the ceramic piston rod 203 is adapted to the inner cavity size of the limiting cylinder 202, and the inner cavity of the limiting cylinder 202 is movably connected to the ceramic piston rod 203. Both ends of the limiting cylinder 202 are open, and one end of the limiting cylinder 202 is communicated with the upper end of the swirl pipe 101. A one-way valve 206 is communicated on the side of the ceramic piston rod 203 close to the fixing frame 201.

[0036] In this embodiment, during the rotation of the transmission rod 111, the eccentric wheel 204 on the transmission rod 111 drives the fixing frame 201 to move left and right reciprocally, so that the fixing frame 201 drives the ceramic piston rod 203 to move accordingly, and then the ceramic piston rod 203 moves left and right reciprocally in the limiting cylinder 202. When the ceramic piston rod 203 moves to the right, the ceramic piston rod 203 pressurizes and pushes the aluminum alloy liquid in the swirl pipe 101, further increasing the flow rate of the aluminum alloy liquid in the swirl pipe 101. At the same time, the tangential velocity of the aluminum alloy liquid increases and the centrifugal force increases, so that the inclusions with larger density in the aluminum alloy liquid (such as alumina and flux inclusions) are more effectively thrown towards the pipe wall, thereby ensuring the swirl filtration effect. Through the setting of the one-way valve 206 on the ceramic piston rod 203, the situation of back suction of the aluminum alloy liquid during the reset process of the ceramic piston rod 203 is avoided, further ensuring the pressurizing effect on the aluminum alloy liquid.

[0037] Preferably, the acceleration component includes a second rotating rod 208 disposed in the inner cavity of the swirl pipe 101. A gear 209 is fixedly installed at the upper end of the second rotating rod 208. A rack 207 is fixedly installed at the upper end of the fixed frame 201. A plurality of fan blades 210 are detachably installed at the lower end of the second rotating rod 208, and the fan blades 210 are annularly distributed. The rack 207 is disposed on the front side of the gear 209. The rack 207 meshes with the gear 209. One end of the rack 207 away from the limiting cylinder 202 is movably connected to the support frame 103.

[0038] In this embodiment, during the movement of the fixed frame 201, the rack 207 on the fixed frame 201 will move accordingly. During the movement, the rack 207 will drive the gear 209 to rotate, and then drive the second rotating rod 208 connected to the gear 209 to rotate, so that the fan blades 210 on the second rotating rod 208 rotate in the vertical direction of the swirl pipe 101, thereby increasing the flow rate of the aluminum alloy liquid in the vertical direction of the swirl pipe 101, eliminating the swirl dead zone, making the distribution of the aluminum alloy liquid in the cavity more uniform. At the same time, the rotating fan blades 210 can generate local turbulence in the flowing aluminum alloy liquid, destroying the mixing layer between the impurities and the aluminum alloy liquid, further promoting the migration of impurities to the wall surface, and improving the swirl filtration effect in the swirl pipe 101 again.

[0039] The usage method of the present invention is as follows: During filtration, first, the aluminum alloy liquid is guided into the swirl pipe 101 through the feed channel 102, and then the aluminum alloy liquid is guided by the swirl guide plate 104 on the inner wall of the swirl pipe 101 to generate a swirling motion. And through the two-stage swirl guide plates 104 arranged inside the swirl pipe 101, the upper swirl guide plate 104 conveys the aluminum alloy liquid in a swirling manner. Finally, the heavier impurities mixed in the aluminum alloy liquid are thrown towards the cavity wall under the action of centrifugal force by the lower swirl guide plate 104, and the heavier impurities slide down along the wall surface to the chute 105, thereby performing a primary filtration treatment on the aluminum alloy liquid, reducing the situation that a large amount of impurities in the aluminum alloy liquid accumulate on the ceramic filter plate, resulting in difficult subsequent filtration, and thus ensuring the filtration effect on the aluminum alloy liquid. Then, the impurities are discharged through the slag discharge valve 106 connected below the chute 105 and collected in the recovery box 107. After the preliminarily filtered aluminum alloy liquid is discharged into the filter box 108, the superimposed semi-circular ceramic filter plate 116 and the square ceramic filter plate 117 in the filter box 108 cooperate to filter the incoming aluminum alloy liquid again. At the same time, the servo motor 110 is turned on, and the servo motor 110 drives the transmission rod 111 to rotate. The first pulley 112 on the transmission rod 111 will rotate accordingly. The first pulley 112 drives the second pulley 114 to rotate through the transmission belt 113, and the second pulley 114 drives the first rotating rod 115 to rotate, thereby driving the semi-circular ceramic filter plate 116 to rotate, and then applying centrifugal force to the impurities falling on the semi-circular ceramic filter plate 116 to throw off the impurities, thus reducing the situation that the filtration effect decreases due to the accumulation and coverage of impurities on the semi-circular ceramic filter plate 116, and further improving the filtration effect on the aluminum alloy liquid. At the same time, during the rotation of the transmission rod 111, the eccentric wheel 204 on the transmission rod 111 drives the fixed frame 201 to move left and right reciprocally, so that the fixed frame 201 drives the ceramic piston rod 203 to move accordingly, and then the ceramic piston rod 203 moves left and right reciprocally in the limit cylinder 202. When the ceramic piston rod 203 moves to the right, the ceramic piston rod 203 pressurizes and pushes the aluminum alloy liquid in the swirl pipe 101, further increasing the flow rate of the aluminum alloy liquid in the swirl pipe 101, and at the same time increasing the tangential velocity of the aluminum alloy liquid and enhancing the centrifugal force, so that the inclusions with a larger density in the aluminum alloy liquid (such as alumina and flux inclusions) are more effectively thrown towards the pipe wall, thus ensuring the swirl filtration effect. At the same time, during the movement of the fixed frame 201, the rack 207 on the fixed frame 201 will move accordingly. During the movement of the rack 207, it drives the gear 209 to rotate, and then drives the second rotating rod 208 connected to the gear 209 to rotate, so that the fan blade 210 on the second rotating rod 208 rotates in the vertical direction of the swirl pipe 101, thereby increasing the flow rate of the aluminum alloy liquid in the vertical direction of the swirl pipe 101, eliminating the swirl dead zone, and making the aluminum alloy liquid more evenly distributed in the cavity.The simultaneously rotating fan blades 210 can generate local turbulence in the flowing aluminum alloy liquid, break the mixing layer of impurities and the aluminum alloy liquid, further promote the migration of impurities towards the wall surface, and improve the swirl filtration effect in the swirl pipe 101 again. Finally, the filtered aluminum alloy liquid is discharged through the discharge channel 109 and enters the next casting and molding stage.

[0040] In all the solutions mentioned above, for the connection between two components, welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods can be selected according to the actual situation, which will not be elaborated one by one here. For those mentioned above that involve fixed connection, welding is preferably considered. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and deformations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method of a high thermal conductivity cast aluminum alloy, characterized in that It includes the following steps: 1) Loading and melting: Add pure aluminum ingots into the furnace, heat up to 700 - 750 °C for melting, then add Al - Si master alloy, stir until completely melted, and then add Al - Cu, Al - Mg and other master alloys in batches to obtain aluminum alloy liquid; 2) Flux refining: Press the refining agent (such as C2Cl6) to the bottom of the aluminum liquid, stir through the degassing equipment and then stand for 10 - 15 minutes to make inclusions float; 3) Gas refining: Then introduce inert gas (N2 or Ar), form bubbles through the rotating nozzle to adsorb hydrogen and impurities; 4) Ceramic filtration: Use a foam ceramic filter plate (pore size 10 - 40 PPI) to filter the aluminum liquid to remove tiny inclusions in the aluminum alloy liquid; 5) Pouring and molding: Preheat the sand mold or metal mold to 200 - 300 °C to prevent cracks caused by rapid cooling of the aluminum liquid. At the same time, control the pouring temperature: 700 - 720 °C (sand casting) or 680 - 700 °C (metal casting). Finally, demold after cooling and forming to obtain high - thermal - conductivity aluminum alloy.

2. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 1, characterized in that, The process of step 4) is completed by the following filtering equipment, including a filtering mechanism (100), which includes a support frame (103), and a swirl pipe (101) arranged on one side of the support frame (103) for conveying the aluminum alloy liquid. A swirl filtering component for filtering the aluminum alloy liquid is arranged inside the swirl pipe (101). The lower end of the swirl pipe (101) is connected to a filtering box (108). An anti - covering filtering component for filtering the incoming aluminum alloy liquid is arranged inside the filtering box (108). A filtering auxiliary mechanism (200) is arranged above the filtering box (108); The filtering auxiliary mechanism (200) includes a limiting cylinder (202) arranged above the filtering box (108). A pressurizing component for pressurizing the aluminum alloy liquid is arranged inside the limiting cylinder (202). An accelerating component for accelerating the aluminum alloy liquid is arranged inside the swirl pipe (101).

3. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 2, characterized in that: The swirl filtering component includes a feeding channel (102) arranged above the swirl pipe (101). The lower end of the feeding channel (102) is connected to the upper end of the swirl pipe (101). The inner wall of the swirl pipe (101) is provided with swirl guiding plates (104). The swirl guiding plates (104) are arranged in two groups. The lower end of the swirl pipe (101) is connected to the filtering box (108). An inclined groove (105) is opened on the inner wall of the lower end of the swirl pipe (101). The side of the inclined groove (105) close to the slag discharge valve (106) has the largest inclination. The lower end of the side of the filtering box (108) away from the swirl pipe (101) is connected to a discharge channel (109). A recovery box (107) is arranged below the slag discharge valve (106).

4. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 3, characterized in that: The anti-coverage filtering component includes a servo motor (110) arranged on one side of a filtering box (108). A transmission rod (111) is installed at the output end of the servo motor (110). A first pulley (112) is fixedly installed at the upper end of the transmission rod (111). A square ceramic filter plate (117) is detachably installed in the middle of the inner cavity of the filtering box (108). A semi-circular ceramic filter plate (116) is arranged above the square ceramic filter plate (117).

5. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 4, characterized in that: A first rotating rod (115) is fixedly installed in the middle of the upper end of the semi-circular ceramic filter plate (116). A second pulley (114) is fixedly installed at the upper end of the first rotating rod (115). The first pulley (112) is flush with the second pulley (114), and the first pulley (112) and the second pulley (114) are connected by a transmission belt (113). The lower end of the semi-circular ceramic filter plate (116) is in contact with the upper end of the square ceramic filter plate (117).

6. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 5, characterized in that: The pressurizing component includes a fixing frame (201) arranged on one side of a limiting cylinder (202). The fixing frame (201) is arranged above the filtering box (108). A ceramic piston rod (203) is fixedly installed in the middle of the fixing frame (201). An eccentric wheel (204) is fixedly installed at the upper end of the transmission rod (111). The side of the eccentric wheel (204) close to the swirl pipe (101) is rotatably connected to the lower end of the fixing frame (201) through a hinge seat (205).

7. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 6, characterized in that: The size of the ceramic piston rod (203) is adapted to the inner cavity size of the limiting cylinder (202), and the inner cavity of the limiting cylinder (202) is movably connected to the ceramic piston rod (203). Both ends of the limiting cylinder (202) are open, and one end of the limiting cylinder (202) is communicated with the upper end of the swirl pipe (101). A one-way valve (206) is communicated with the side of the ceramic piston rod (203) close to the fixing frame (201).

8. The preparation method of a high thermal conductivity cast aluminum alloy according to claim 7, characterized in that: The acceleration component includes a second rotating rod (208) arranged in the inner cavity of the swirl pipe (101). A gear (209) is fixedly installed at the upper end of the second rotating rod (208). A rack (207) is fixedly installed at the upper end of the fixing frame (201). A plurality of fan blades (210) are detachably installed at the lower end of the second rotating rod (208), and the fan blades (210) are annularly distributed. The rack (207) is arranged in front of the gear (209). The rack (207) is engaged with the gear (209). The end of the rack (207) far from the limiting cylinder (202) is movably connected to a support frame (103).

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