A high-toughness aluminum alloy ingot melting and casting forming device and integrated process

Abstract

This application discloses a high-toughness aluminum alloy ingot melting and casting forming device and integrated process, relating to the field of aluminum alloy melting and casting processing technology. The high-toughness aluminum alloy ingot melting and casting forming device includes: a refining furnace, a closed degassing assembly, and a gas supply assembly. The closed degassing assembly is fixedly installed above the refining furnace and includes a preheating cylinder, an assembly cylinder, a closed transmission box, and a pair of rotors. The preheating cylinder is fixedly installed above the refining furnace and connected to it. The assembly cylinder is sleeved on the outside of the preheating cylinder, and the closed transmission box is installed inside the assembly cylinder. Both the assembly cylinder and the closed transmission box can move up and down along the axial direction of the preheating cylinder. The pair of rotors are rotatably connected to the closed transmission box. The gas supply assembly is configured in conjunction with the pair of rotors and includes a gas supply pipe, a filtering and conveying unit, and a pair of connecting pipes. This application has the effect of improving the quality of high-toughness aluminum alloy ingot melting and casting processing.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy melting and casting processing technology, and in particular to a high-toughness aluminum alloy ingot melting and casting forming device and integrated process. Background Technology

[0002] High-toughness aluminum alloys are a class of aluminum alloy materials with good fracture toughness, crack propagation resistance, and plasticity. They are widely used in the manufacturing of high-end mechanical parts. Current technologies mainly improve the fracture toughness and fatigue performance of high-toughness aluminum alloys by adding raw material purity, alloying elements, and trace elements, as well as through heat treatment. However, the impact of degassing during the casting process on the performance of high-toughness aluminum alloys is ignored. During the subsequent casting and cooling process, the solubility of hydrogen decreases sharply as the temperature decreases. When the liquid aluminum alloy raw material solidifies, hydrogen will be released from the inside and form pores on the outside of the aluminum alloy product, resulting in "hydrogen embrittlement" of the aluminum alloy.

[0003] In existing technologies, mobile aluminum liquid degassing machines are mainly used in conjunction with refining furnaces to degas liquid aluminum alloy raw materials. This is achieved by rotating a rotor in the liquid aluminum alloy raw material and spraying out inert gases such as nitrogen or argon to release hydrogen from the liquid aluminum alloy raw material.

[0004] However, traditional mobile aluminum liquid degassing machines have poor sealing performance with refining furnaces in practical applications. This makes them susceptible to air ingress when the rotor rotates to degas the liquid aluminum alloy raw material, resulting in secondary air intake of the liquid aluminum alloy raw material. This not only results in poor degassing effect on the liquid aluminum alloy raw material, but also in poor safety, energy saving, and environmental protection. Summary of the Invention

[0005] To address the issues of poor degassing performance of traditional mobile aluminum liquid degassing machines on liquid aluminum alloy raw materials, as well as their poor safety, energy efficiency, and environmental friendliness, this application provides a high-toughness aluminum alloy ingot melting and casting device and integrated process.

[0006] This application provides a high-toughness aluminum alloy ingot casting and forming device and integrated process, adopting the following technical solution: A high-toughness aluminum alloy ingot melting and casting device includes: a refining furnace, a closed degassing assembly, and a gas supply assembly. The closed degassing assembly is fixedly installed above the refining furnace and includes a preheating cylinder, an assembly cylinder, a closed transmission box, and a pair of rotors. The preheating cylinder is fixedly installed above the refining furnace and connected to it. The assembly cylinder is sleeved on the outside of the preheating cylinder, and the closed transmission box is installed inside the assembly cylinder. Both the assembly cylinder and the closed transmission box can move up and down along the axial direction of the preheating cylinder. The pair of rotors are rotatably connected to the closed transmission box. The gas supply assembly is configured to cooperate with the pair of rotors. The gas supply assembly includes a gas supply pipe, a filtering and conveying unit, and a pair of connecting pipes. The inlet of the filtering and conveying unit is connected to the outlet of the gas supply pipe, and the outlet of the filtering and conveying unit is connected to the pair of connecting pipes. The pair of connecting pipes are fixedly connected to the closed transmission box and rotatably cooperate with the pair of rotors.

[0007] By adopting the above technical solution, in practical applications, liquid aluminum alloy raw materials are transported to a refining furnace for heating and refining. Simultaneously, nitrogen or argon gas is supplied to a pair of rotors via a gas delivery pipe, a filter conveying unit, and a pair of connecting pipes. Subsequently, by controlling the descent of the assembly cylinder and the enclosed transmission box, the pair of rotors extend below the surface of the liquid aluminum alloy raw materials in the refining furnace. Through the simultaneous rotation of the rotors and the release of gas, hydrogen gas in the liquid aluminum alloy raw materials is released as the nitrogen or argon gas rises, thereby reducing the likelihood of excessive porosity after the liquid aluminum alloy raw materials cool and solidify, and improving the quality of high-toughness aluminum alloy ingot casting.

[0008] Optionally, a slag skimmer is provided on one side of the refining furnace, and a liquid inlet and a liquid outlet are provided on both sides of the refining furnace, respectively.

[0009] By adopting the above technical solution, in practical applications, it is convenient to remove the floating slag on the surface of the liquid aluminum alloy raw material after degassing in the refining furnace through the slag skimmer. The molten liquid aluminum alloy raw material can be transported to the refining furnace through the liquid inlet for refining and degassing, and can be discharged through the liquid outlet after degassing.

[0010] Optionally, it also includes a smelting furnace, a refining and stirring furnace, and a casting platform. The smelting furnace is located on one side of the refining furnace, and the outlet of the smelting furnace is connected to the inlet of the refining furnace. The inlet of the refining and stirring furnace is connected to the outlet of the refining furnace, and the inlet of the casting platform is connected to the outlet of the refining and stirring furnace.

[0011] By adopting the above technical solution, in practical application, a smelting furnace is used to smelt aluminum raw materials and alloy raw materials, and a fine stirring furnace is used to finely filter the liquid aluminum alloy raw materials after refining and degassing in the refining furnace. A casting table is used to cool and shape the finely filtered liquid aluminum alloy raw materials.

[0012] Optionally, the preheating cylinder includes a heat-conducting inner layer, a heat-insulating outer layer, and multiple sets of heating coils. The heat-conducting inner layer is a cylindrical component with openings at both ends. The heat-insulating outer layer is sleeved on the outside of the heat-conducting inner layer, and the multiple sets of heating coils are evenly distributed between the heat-conducting inner layer and the heat-insulating outer layer.

[0013] By adopting the above technical solution, in practical applications, the heat-conducting inner layer is heated by the operation of multiple sets of heating coils, and the heating coils are insulated by the heat-insulating outer layer. The rotor located in the preheating cylinder is preheated by the combination of the heat-conducting inner layer and the heating coils, so as to avoid the situation where part of the liquid aluminum alloy solidifies on the outside of the rotor due to the large temperature difference when the rotor is inserted into the liquid aluminum alloy raw material.

[0014] Optionally, the closed degassing assembly further includes a pair of first lifting drive components and a pair of second lifting drive components. The pair of first lifting drive components are symmetrically arranged on both sides of the assembly cylinder, and the telescopic ends of the pair of first lifting drive components are fixedly connected to the assembly cylinder. The pair of second lifting drive components are fixedly arranged above the assembly cylinder, and the telescopic ends of the pair of second lifting drive components are fixedly connected to the closed transmission box.

[0015] By adopting the above technical solution, in practical application, the assembly cylinder is lifted by controlling the extension of the telescopic end of the first lifting drive component, and the closed transmission box is lowered by controlling the extension of the telescopic end of the second lifting drive component.

[0016] Optionally, the closed degassing assembly further includes a pair of drive gears, a drive motor, and a transmission gear. The pair of drive gears are respectively fixedly connected to one end of a pair of rotors located inside the closed transmission box, and the pair of drive gears mesh with each other. The drive motor is fixedly installed above the closed transmission box, and the transmission gear is fixedly connected to the output end of the drive motor, and the transmission gear meshes with one of the drive gears.

[0017] By adopting the above technical solution, in practical applications, the operation of the drive motor is controlled to drive the transmission gear to rotate. The transmission gear drives one of the drive gears to rotate, and the other drive gear will also rotate under meshing action, thereby enabling a pair of drive gears to drive a pair of rotors to rotate in opposite directions.

[0018] Optionally, the rotor includes a transmission connecting rod, a rod body, a nozzle, and multiple sets of stirring blades. The transmission connecting rod is a tubular component with open ends, and the transmission connecting rod is rotatably connected to a closed transmission box. The rod body is fixedly connected to the lower end of the transmission connecting rod, and a conical acceleration guide groove is provided inside the rod body.

[0019] By adopting the above technical solution, the transmission connecting rod is used to connect and fix the rod body, and the rod body is used to connect, fix, and rotate the nozzle. Simultaneously, the transmission connecting rod and the rod body are used for conveying nitrogen or argon gas.

[0020] Optionally, the nozzle and the lower end of the rod are integrally formed, and multiple sets of stirring blades are evenly distributed below the nozzle and fixedly connected to the lower bottom surface of the nozzle. Multiple flow guiding slits are opened inside the nozzle, and multiple evenly distributed spray holes are opened on the lower bottom surface of the nozzle. The spray holes are connected to the flow guiding slits, and the spray holes are inclined from the inside to the outside. The multiple flow guiding slits and multiple spray holes are staggered with the multiple sets of stirring blades.

[0021] By adopting the above technical solution, in practical applications, nitrogen or argon gas transported along the conical acceleration guide groove is delivered into multiple guide slits and sprayed out along the blow holes, thereby degassing the liquid aluminum alloy raw material in the refining furnace.

[0022] Optionally, the filtration and delivery unit includes a filter box, a filter element, a flexible delivery air pipe, and a guide air pipe. The filter box is fixedly installed inside the assembly cylinder and connected to the air outlet of the delivery air pipe. The filter element is fixedly installed inside the filter box. One end of the flexible delivery air pipe is connected to the filter box. The guide air pipe has one air inlet and two air outlets. The air inlet of the guide air pipe is connected to the other end of the flexible delivery air pipe. The two air outlets of the guide air pipe are respectively connected to a pair of connecting pipes.

[0023] By adopting the above technical solution, in practical applications, the nitrogen or argon gas delivered in the gas delivery pipe is delivered to the filter box, and after being filtered by the filter delivery unit, it is delivered to a pair of connecting pipes along the elastic delivery gas pipe and the guide gas pipe.

[0024] This invention also provides an integrated process for melting and casting high-toughness aluminum alloy ingots, including the high-toughness aluminum alloy ingot melting and casting apparatus described above, and further including the following steps: S1. Raw material smelting: Aluminum raw materials and alloying elements are added to the smelting furnace for heating and smelting to form liquid aluminum alloy raw materials, and the slag floating on the liquid surface is removed. S2. Refining and degassing: The slag-removed liquid aluminum alloy raw material is transported to the refining furnace for refining. During the refining process, nitrogen or argon is delivered to a pair of rotors through a combination of gas supply pipe and filter conveying unit. Then, the lower ends of the pair of rotors are extended 120mm below the liquid surface of the liquid aluminum alloy raw material by driving the assembly cylinder and the closed transmission box to descend. Nitrogen or argon is delivered to the liquid aluminum alloy raw material through a pair of rotors rotating in opposite directions, so that hydrogen in the liquid aluminum alloy raw material is released. S3. Refining and filtration: The liquid aluminum alloy raw material in the refining furnace is transported to the refining stirring furnace for stirring. After stirring, it is left to stand for 10 to 20 minutes to allow the grains to nucleate and refine evenly. At the same time, a high-precision ceramic filter screen of 100 to 200 mesh is used to filter the refined liquid aluminum alloy raw material. S4. Cooling and casting: The filtered liquid aluminum alloy raw material is transported to the casting table for casting. Gradient cooling is used to cool and solidify the ingot. After the ingot cools to room temperature, it is demolded to obtain the finished high-toughness aluminum alloy ingot.

[0025] In summary, the embodiments of the present invention provide a high-toughness aluminum alloy ingot casting and forming apparatus and an integrated process, including at least one of the following beneficial technical effects: 1. The preheating cylinder and the assembly cylinder are used to form a closed degassing structure, which can perform closed degassing treatment on liquid aluminum alloy raw materials, greatly reducing the occurrence of secondary air intake during the stirring degassing process. At the same time, it reduces the splashing of liquid aluminum alloy raw materials or heat loss, and improves the safety and energy saving of degassing. 2. By combining the conical acceleration guide groove, the guide slit and the blowing hole, the gradient gas delivery method enables nitrogen or argon to absorb hydrogen in the liquid aluminum alloy raw material in the form of small bubbles, which improves the degassing effect of the liquid aluminum alloy raw material, greatly reduces the occurrence of porosity during the subsequent cooling and solidification of aluminum alloy ingots, and ensures the fracture toughness and fatigue performance of high toughness aluminum alloy. 3. By setting up a filter box and a flexible gas delivery pipe, not only can inert gases such as nitrogen or argon be stably delivered, but the nitrogen or argon can also be preheated during the delivery process, reducing the possibility of poor cooling or degassing of liquid aluminum alloy raw materials due to excessive temperature difference. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a high-toughness aluminum alloy ingot casting and forming device provided in an embodiment of the present invention; Figure 2 A cross-sectional view of a high-toughness aluminum alloy ingot casting and forming apparatus provided in an embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of a portion of the structure at point A; Figure 4 for Figure 2 Enlarged view of the structure at point B in the middle; Figure 5 This is a partial structural diagram of the rotor in a high-toughness aluminum alloy ingot casting and forming device provided in an embodiment of the present invention; Figure 6A cross-sectional view of a rotor in a high-toughness aluminum alloy ingot casting and forming device provided in an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of the structure at point C; Figure 8 This is a partial structural schematic diagram of a high-toughness aluminum alloy ingot melting and casting device provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the overall assembly of a high-toughness aluminum alloy ingot melting and casting forming device provided in an embodiment of the present invention; Figure 10 A flowchart of an integrated process for melting and casting high-toughness aluminum alloy ingots, provided for an embodiment of the present invention.

[0027] Explanation of the markings in the image: 1. Refining furnace; 2. Enclosed degassing assembly; 201. Preheating cylinder; 2011. Heat-conducting inner layer; 2012. Heat-insulating outer layer; 2013. Heating coil; 202. Assembly cylinder; 203. Enclosed transmission box; 204. Rotor; 2041. Transmission connecting rod; 2042. Rod body; 2043. Nozzle; 2044. Stirring blade; 205. First lifting drive component; 206. Second lifting drive component; 207. Drive gear; 208. Drive motor; 209. Transmission gear; 3. Air supply assembly; 301. Air supply pipe; 302. Filter delivery unit; 3021. Filter box; 3022. Filter element; 3023. Flexible air delivery pipe; 3024. Guide air pipe; 303. Connecting pipe; 4. Smelting furnace; 5. Refine the mixing furnace; 6. Casting stand. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1 to 10 This application will be described in further detail.

[0029] Combination Figure 1 and Figure 2 This application discloses a high-toughness aluminum alloy ingot melting and casting apparatus, comprising: a refining furnace 1, a closed degassing component 2, and a gas supply component 3. In practical applications, the refining furnace 1 stores and refines the molten liquid aluminum alloy raw material. Simultaneously, the closed degassing component 2 and the gas supply component 3 work together to stir and degas the liquid aluminum alloy raw material, greatly reducing the occurrence of porosity during the subsequent cooling and solidification of the aluminum alloy ingot, thus ensuring the fracture toughness and fatigue performance of the subsequent aluminum alloy ingot.

[0030] Specifically, a slag skimmer is provided on one side of the refining furnace 1 to facilitate the removal of floating slag from the surface of the liquid aluminum alloy raw material after degassing inside the refining furnace 1. An inlet and an outlet are respectively provided on both sides of the refining furnace 1. The molten liquid aluminum alloy raw material can be transported into the refining furnace 1 through the inlet for refining and degassing, and can be discharged through the outlet after degassing.

[0031] It should be noted that refining furnace 1 has a heating function, which can heat and refine the liquid aluminum alloy raw materials inside.

[0032] Combination Figure 9 It also includes a smelting furnace 4, a refining stirring furnace 5, and a casting platform 6. The smelting furnace 4 is located on one side of the refining furnace 1, and the outlet of the smelting furnace 4 is connected to the inlet of the refining furnace 1. The smelting furnace 4 is used to smelt aluminum raw materials and alloy raw materials.

[0033] Combination Figure 9 The inlet of the refining stirring furnace 5 is connected to the outlet of the refining furnace 1, and the inlet of the casting table 6 is connected to the outlet of the refining stirring furnace 5. The refining stirring furnace 5 is used to refine and filter the liquid aluminum alloy raw material after refining and degassing in the refining furnace 1, and the casting table 6 is used to cool and shape the refined and filtered liquid aluminum alloy raw material.

[0034] Combination Figure 2 and Figure 3 The closed degassing assembly 2 is fixedly installed above the refining furnace 1. The closed degassing assembly 2 includes a preheating cylinder 201, an assembly cylinder 202, a closed transmission box 203, and a pair of rotors 204. The preheating cylinder 201 is fixedly installed above the refining furnace 1 and is connected to the refining furnace 1. In actual application, by controlling the assembly cylinder 202 and the closed transmission box 203 to descend, the pair of rotors 204 extend below the liquid surface of the liquid aluminum alloy raw material in the refining furnace 1. By rotating the rotors 204 while spraying air, the hydrogen in the liquid aluminum alloy raw material will be released as nitrogen or argon rises.

[0035] Combination Figure 2 and Figure 3The preheating cylinder 201 includes a heat-conducting inner layer 2011, a heat-insulating outer layer 2012, and multiple sets of heating coils 2013. The heat-conducting inner layer 2011 is a cylindrical component open at both ends. The heat-insulating outer layer 2012 is sleeved on the outside of the heat-conducting inner layer 2011. The multiple sets of heating coils 2013 are evenly distributed between the heat-conducting inner layer 2011 and the heat-insulating outer layer 2012. The heat-conducting inner layer 2011 is heated by the operation of the multiple sets of heating coils 2013, and the heating coils 2013 are insulated by the heat-insulating outer layer 2012. The rotor 204 located inside the preheating cylinder 201 is preheated by the cooperation of the heat-conducting inner layer 2011 and the heating coils 2013, which avoids the situation where part of the liquid aluminum alloy solidifies on the outside of the rotor 204 due to the large temperature difference when the rotor 204 is inserted into the liquid aluminum alloy raw material.

[0036] Combination Figure 1 , Figure 2 and Figure 3 The assembly cylinder 202 is fitted onto the outside of the preheating cylinder 201. The assembly cylinder 202 and the preheating cylinder 201 cooperate to form a closed degassing structure, which avoids secondary air intake during degassing.

[0037] Combination Figure 2 and Figure 8 The enclosed transmission box 203 is located inside the assembly cylinder 202. The enclosed transmission box 203 is used for assembly positioning and rotation drive of the rotor 204.

[0038] It is worth noting that both the assembly cylinder 202 and the enclosed transmission box 203 can move up and down along the axial direction of the preheating cylinder 201. The height of the rotor 204 is adjusted by controlling the lifting of the assembly cylinder 202 and the enclosed transmission box 203.

[0039] Combination Figure 1 and Figure 2 The closed-loop degassing assembly 2 also includes a pair of first lifting drive components 205 and a pair of second lifting drive components 206. The pair of first lifting drive components 205 are symmetrically arranged on both sides of the assembly cylinder 202, and the telescopic ends of both first lifting drive components 205 are fixedly connected to the assembly cylinder 202. The assembly cylinder 202 is lifted by controlling the extension of the telescopic ends of the first lifting drive components 205. The pair of second lifting drive components 206 are fixedly arranged above the assembly cylinder 202, and the telescopic ends of both second lifting drive components 206 are fixedly connected to the closed transmission box 203. The closed transmission box 203 is lowered by controlling the extension of the telescopic ends of the second lifting drive components 206.

[0040] Combination Figure 2 and Figure 8The closed-loop degassing assembly 2 also includes a pair of drive gears 207, a drive motor 208, and a transmission gear 209. The drive gears 207 are fixedly connected to one end of each rotor 204 located within the closed transmission housing 203, and the drive gears 207 mesh with each other. The drive motor 208 is fixedly mounted above the closed transmission housing 203. The transmission gear 209 is fixedly connected to the output end of the drive motor 208, and meshes with one of the drive gears 207. By controlling the operation of the drive motor 208, the transmission gear 209 is driven to rotate. The transmission gear 209 drives one of the drive gears 207 to rotate, and the other drive gear 207 also rotates under meshing action, thus enabling the pair of drive gears 207 to drive the pair of rotors 204 to rotate in opposite directions.

[0041] It should be noted that a heat insulation cover is provided on the outside of the drive motor 208 to prevent the high temperature inside the assembly cylinder 202 from adversely affecting the operation of the drive motor 208.

[0042] Combination Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 A pair of rotors 204 are rotatably connected to a closed transmission box 203. Each rotor 204 includes a transmission connecting rod 2041, a rod body 2042, a nozzle 2043, and multiple sets of stirring blades 2044. The transmission connecting rod 2041 is a tubular component open at both ends and rotatably connected to the closed transmission box 203. The rod body 2042 is fixedly connected to the lower end of the transmission connecting rod 2041, and a conical acceleration guide groove is formed inside the rod body 2042. The transmission connecting rod 2041 is used to connect and fix the rod body 2042, and the rod body 2042 is used to connect, fix, and drive the nozzle 2043 to rotate. Simultaneously, the transmission connecting rod 2041 and the rod body 2042 are used for conveying nitrogen or argon gas.

[0043] Combination Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 The nozzle 2043 is integrally formed with the lower end of the rod 2042. Multiple sets of stirring blades 2044 are evenly distributed below the nozzle 2043 and fixedly connected to the lower bottom surface of the nozzle 2043. Multiple guide slits are opened inside the nozzle 2043, and multiple evenly distributed spray holes are opened on the lower bottom surface of the nozzle 2043. The spray holes are connected to the guide slits and are inclined from the inside to the outside. The multiple guide slits and multiple spray holes are staggered with the multiple sets of stirring blades 2044. Nitrogen or argon gas transported along the conical acceleration guide groove is transported to the multiple guide slits and sprayed out along the spray holes, thereby degassing the liquid aluminum alloy raw material in the refining furnace 1.

[0044] Combination Figure 1 , Figure 2 and Figure 4 The gas supply assembly 3 is configured to cooperate with a pair of rotors 204. The gas supply assembly 3 includes a gas supply pipe 301, a filter delivery unit 302, and a pair of connecting pipes 303. In practical applications, nitrogen or argon gas is delivered to the pair of rotors 204 through the gas supply pipe 301, the filter delivery unit 302, and the pair of connecting pipes 303.

[0045] In addition, a gas storage cylinder is provided on one side of the refining furnace 1. The gas inlet of the gas supply pipe 301 is connected to the gas storage cylinder through a flow valve and a pressure gauge. The flow valve and the pressure gauge can quantitatively deliver nitrogen or argon from the gas storage cylinder to the gas supply pipe 301.

[0046] Combination Figure 2 , Figure 4 and Figure 8 The air inlet of the filter conveying unit 302 is connected to the air outlet of the air supply pipe 301. The air outlet of the filter conveying unit 302 is connected to a pair of connecting pipes 303 respectively. The pair of connecting pipes 303 are fixedly connected to the closed transmission box 203 and rotate with a pair of rotors 204.

[0047] Combination Figure 2 , Figure 4 and Figure 8 The filtration and delivery unit 302 includes a filter box 3021, a filter element 3022, a flexible delivery air pipe 3023, and a guide air pipe 3024. The filter box 3021 is fixedly installed inside the assembly cylinder 202 and is connected to the outlet of the air supply pipe 301. The filter element 3022 is fixedly installed inside the filter box 3021. One end of the flexible delivery air pipe 3023 is connected to the filter box 3021. The guide air pipe 3024 has one inlet and two outlets. The inlet of the guide air pipe 3024 is connected to the other end of the flexible delivery air pipe 3023, and the two outlets of the guide air pipe 3024 are respectively connected to a pair of connecting pipes 303. Nitrogen or argon gas supplied in the air supply pipe 301 is delivered to the filter box 3021, and after being filtered by the filtration and delivery unit 302, it is delivered along the flexible delivery air pipe 3023 and the guide air pipe 3024 to the pair of connecting pipes 303.

[0048] In practical use, liquid aluminum alloy raw material is conveyed into refining furnace 1 through the inlet. Simultaneously, nitrogen or argon gas is conveyed through gas supply pipe 301 to filter box 3021, filtered by filter element 3022, and then conveyed along flexible gas supply pipe 3023, guide gas pipe 3024, and a pair of connecting pipes 303 to a pair of transmission connecting rods 2041. Furthermore, during the conveying process, hot air inside assembly cylinder 202 preheats the nitrogen or argon gas before it is conveyed to the transmission connecting rods 2041.

[0049] Furthermore, the preheated nitrogen or argon gas can be ejected along the conical acceleration guide groove, the guide slit, and the blow hole. Subsequently, by controlling the retraction of the telescopic end of the first lifting drive component 205 and the extension of the telescopic end of the second lifting drive component 206, the assembly cylinder 202 is driven to descend and reset, and the closed transmission box 203 is driven to descend, thereby moving the nozzle 2043, which is in the jetting state, below the liquid surface of the liquid aluminum alloy raw material.

[0050] In addition, by controlling the operation of the drive motor 208 to drive the transmission gear 209 to rotate, a pair of drive gears 207 drive a pair of rotors 204 to rotate in opposite directions under the transmission action of the transmission gears 209. This makes the pair of rotors 204 rotate while being sprayed with gas, which improves the absorption and removal effect of nitrogen or argon on hydrogen in liquid aluminum alloy raw materials and reduces the adverse effects of degassing on the fracture toughness and fatigue performance of aluminum alloy.

[0051] An integrated process for melting and casting high-toughness aluminum alloy ingots includes the above-mentioned high-toughness aluminum alloy ingot melting and casting apparatus, and further includes the following steps: S1. Raw material smelting: Aluminum raw materials and alloying elements are added to smelting furnace 4 for heating and smelting to form liquid aluminum alloy raw materials, and the slag floating on the liquid surface is removed. S2. Refining and degassing: The liquid aluminum alloy raw material after slag removal is transported to the refining furnace 1 for refining. During the refining process, nitrogen or argon is transported to a pair of rotors 204 through the cooperation of the gas supply pipe 301 and the filter conveying unit 302. Then, by driving the assembly cylinder 202 and the closed transmission box 203 to descend, the lower end of the pair of rotors 204 is extended to 120mm below the liquid surface of the liquid aluminum alloy raw material. Nitrogen or argon is transported to the liquid aluminum alloy raw material through the pair of rotors 204 rotating in opposite directions, so that hydrogen in the liquid aluminum alloy raw material is released. S3. Refining and filtration: The liquid aluminum alloy raw material in the refining furnace 1 is transported to the refining stirring furnace 5 for stirring. After stirring, it is left to stand for 10 to 20 minutes to allow the grains to nucleate and refine evenly. At the same time, a high-precision ceramic filter screen of 100 to 200 mesh is used to filter the refined liquid aluminum alloy raw material. S4. Cooling and casting: The filtered liquid aluminum alloy raw material is transported to the casting table 6 for casting and molding. Gradient cooling is used to cool and solidify the ingot. After the ingot cools to room temperature, it is demolded to obtain a high-toughness aluminum alloy ingot product.

[0052] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-toughness aluminum alloy ingot melting and casting device, characterized in that, include: Refining furnace (1); A closed degassing assembly (2) is fixedly installed above the refining furnace (1). The closed degassing assembly (2) includes a preheating cylinder (201), an assembly cylinder (202), a closed transmission box (203), and a pair of rotors (204). The preheating cylinder (201) is fixedly installed above the refining furnace (1) and is connected to the refining furnace (1). The assembly cylinder (202) is sleeved on the outside of the preheating cylinder (201). The closed transmission box (203) is installed inside the assembly cylinder (202). Both the assembly cylinder (202) and the closed transmission box (203) can move up and down along the axial direction of the preheating cylinder (201). The pair of rotors (204) are rotatably connected to the closed transmission box (203). An air supply assembly (3) is configured to cooperate with a pair of rotors (204). The air supply assembly (3) includes an air supply pipe (301), a filter conveying unit (302), and a pair of connecting pipes (303). The air inlet of the filter conveying unit (302) is connected to the air outlet of the air supply pipe (301). The air outlet of the filter conveying unit (302) is connected to a pair of connecting pipes (303). Both of the connecting pipes (303) are fixedly connected to the closed transmission box (203) and rotate in cooperation with the pair of rotors (204).

2. The high-toughness aluminum alloy ingot melting and casting device according to claim 1, characterized in that: The refining furnace (1) has a slag skimming port on one side and a liquid inlet and a liquid outlet on both sides of the refining furnace (1).

3. The high-toughness aluminum alloy ingot melting and casting device according to claim 2, characterized in that: It also includes a smelting furnace (4), a refining stirring furnace (5), and a casting platform (6). The smelting furnace (4) is located on one side of the refining furnace (1), and the outlet of the smelting furnace (4) is connected to the inlet of the refining furnace (1). The inlet of the refining stirring furnace (5) is connected to the outlet of the refining furnace (1), and the inlet of the casting platform (6) is connected to the outlet of the refining stirring furnace (5).

4. The high-toughness aluminum alloy ingot melting and casting device according to claim 1, characterized in that: The preheating cylinder (201) includes a heat-conducting inner layer (2011), a heat-insulating outer layer (2012), and multiple sets of heating coils (2013). The heat-conducting inner layer (2011) is a cylindrical component with open ends. The heat-insulating outer layer (2012) is sleeved on the outside of the heat-conducting inner layer (2011). The multiple sets of heating coils (2013) are evenly distributed between the heat-conducting inner layer (2011) and the heat-insulating outer layer (2012).

5. The high-toughness aluminum alloy ingot melting and casting device according to claim 1, characterized in that: The closed degassing assembly (2) further includes a pair of first lifting drive components (205) and a pair of second lifting drive components (206). The pair of first lifting drive components (205) are symmetrically arranged on both sides of the assembly cylinder (202), and the telescopic ends of the pair of first lifting drive components (205) are fixedly connected to the assembly cylinder (202). The pair of second lifting drive components (206) are fixedly arranged above the assembly cylinder (202), and the telescopic ends of the pair of second lifting drive components (206) are fixedly connected to the closed transmission box (203).

6. The high-toughness aluminum alloy ingot melting and casting device according to claim 1, characterized in that: The closed degassing assembly (2) further includes a pair of drive gears (207), a drive motor (208), and a transmission gear (209). The pair of drive gears (207) are respectively fixedly connected to one end of a pair of rotors (204) located in the closed transmission box (203), and the pair of drive gears (207) mesh with each other. The drive motor (208) is fixedly installed above the closed transmission box (203). The transmission gear (209) is fixedly connected to the output end of the drive motor (208), and the transmission gear (209) meshes with one of the drive gears (207).

7. The high-toughness aluminum alloy ingot melting and casting device according to claim 1, characterized in that: The rotor (204) includes a transmission connecting rod (2041), a rod body (2042), a nozzle (2043), and multiple sets of stirring blades (2044). The transmission connecting rod (2041) is a tubular component with open ends, and the transmission connecting rod (2041) is rotatably connected to the closed transmission box (203). The rod body (2042) is fixedly connected to the lower end of the transmission connecting rod (2041), and a conical acceleration guide groove is provided inside the rod body (2042).

8. The high-toughness aluminum alloy ingot melting and casting device according to claim 7, characterized in that: The nozzle (2043) is integrally formed with the lower end of the rod (2042). Multiple sets of stirring blades (2044) are evenly distributed below the nozzle (2043) and are fixedly connected to the bottom surface of the nozzle (2043). Multiple flow guiding slits are opened inside the nozzle (2043). Multiple evenly distributed spray holes are opened on the bottom surface of the nozzle (2043). The spray holes are connected to the flow guiding slits and are inclined from the inside to the outside. Multiple flow guiding slits and multiple spray holes are staggered with multiple sets of stirring blades (2044).

9. The high-toughness aluminum alloy ingot melting and casting device according to claim 1, characterized in that: The filter delivery unit (302) includes a filter box (3021), a filter element (3022), an elastic delivery air pipe (3023), and a guide air pipe (3024). The filter box (3021) is fixedly installed inside the assembly cylinder (202) and is connected to the air outlet of the air delivery pipe (301). The filter element (3022) is fixedly installed inside the filter box (3021). One end of the elastic delivery air pipe (3023) is connected to the filter box (3021). The guide air pipe (3024) has one air inlet and two air outlets. The air inlet of the guide air pipe (3024) is connected to the other end of the elastic delivery air pipe (3023). The two air outlets of the guide air pipe (3024) are respectively connected to a pair of connecting pipes (303).

10. An integrated process for melting and casting high-toughness aluminum alloy ingots, comprising a high-toughness aluminum alloy ingot melting and casting apparatus as described in any one of claims 1 to 9, characterized in that, It also includes the following steps: S1. Raw material smelting: Add aluminum raw materials and alloying elements into the smelting furnace (4) for heating and smelting to form liquid aluminum alloy raw materials, and remove the slag floating on the liquid surface. S2. Refining and degassing: The liquid aluminum alloy raw material after slag removal is transported to the refining furnace (1) for refining. During the refining process, nitrogen or argon is transported to a pair of rotors (204) by the cooperation of the gas supply pipe (301) and the filter conveying unit (302). Subsequently, the lower end of the pair of rotors (204) is extended 120mm below the liquid surface of the liquid aluminum alloy raw material by the method of driving the assembly cylinder (202) and the closed transmission box (203) to descend. Nitrogen or argon is transported to the liquid aluminum alloy raw material by a pair of rotors (204) rotating in opposite directions, so that hydrogen in the liquid aluminum alloy raw material is released. S3. Refine filtration: The liquid aluminum alloy raw material in the refining furnace (1) is transported to the fine stirring furnace (5) for stirring. After stirring, it is left to stand for 10 to 20 minutes to make the grains uniformly nucleate and refine. At the same time, a high-precision ceramic filter screen of 100 to 200 mesh is used to filter the refined liquid aluminum alloy raw material. S4. Cooling and casting: The filtered liquid aluminum alloy raw material is transported to the casting table (6) for casting and molding. The ingot is cooled and solidified by gradient cooling. After the ingot is cooled to room temperature, it is demolded to obtain a high-toughness aluminum alloy ingot product.

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