Manufacturing method of aluminum suction pipe

Abstract

The invention discloses a manufacturing method of an aluminum suction pipe. The problem that an existing aluminum suction pipe is poor in quality due to casting defects is solved. The method comprises the four steps of metal mold and inner cavity sand core design, quantitative bag manufacturing, vacuumizing treatment and casting and solidification, and by adopting the mode of combining the metal mold and the precoated sand core, sand holes are effectively avoided; slag removal is carried out in the quantitative ladle, so that impurities in molten iron injected into a mold cavity are reduced; and reasonable casting flow guide, rotary casting and vacuumizing technologies are adopted, so that the molten iron can stably flow, air holes and iron shots are avoided, and particularly, the problems of sand core bending and non-uniform skin thickness of the aluminum suction pipe caused by the buoyancy of the molten iron are effectively solved by applying the rotary casting and vertical solidification technologies.

Description

Technical Field

[0001] This application relates to the technical field of aluminum suction pipe casting, and particularly relates to a method for manufacturing an aluminum suction pipe. Background Art

[0002] Currently, the production of aluminum suction pipes mainly relies on two methods: lost foam casting and green sand casting. However, it is difficult to avoid defects such as pores, sand core bending, and molten iron impurities in the production process of these two methods, resulting in poor overall quality of the aluminum suction pipes, affecting their performance and service life.

[0003] An aluminum suction pipe is a pipe system used to extract aluminum liquid from an electrolytic aluminum liquid pool and transport it to a transfer ladle. It is a segmented structure and is usually composed of three pipe castings: pipe A 3, pipe B 4, and pipe C 5. The specific structure is as Figure 1 shown. During operation, the front end of pipe A 3 is immersed in the aluminum liquid pool, and the aluminum liquid is pumped along pipe B 4 and pipe C 5 to the transfer ladle through negative pressure. Since the aluminum suction pipe is directly in contact with the aluminum liquid, the metal pipe body will react chemically with the aluminum liquid, resulting in the erosion of the pipe body and perforation. Especially when there are casting defects (such as sand holes, slag holes, pores, shrinkage cavities, etc.) in the aluminum suction pipe, these defect parts are more vulnerable to erosion, resulting in the failure of the aluminum suction pipe, the inability to maintain negative pressure due to air leakage, and affecting the pumping of aluminum liquid.

[0004] In addition, during the process of pumping aluminum liquid by the aluminum suction pipe, the aluminum liquid will also undergo a thermite reaction (AI + Fe2O3 → Fe + Al2O3) with the iron oxide on the surface of the pipe body, further generating compounds FeAl3 and Fe2Al5. These reactions will first erode the defect parts of the aluminum suction pipe. According to the research in "Research on the Corrosion Behavior of Metal Materials and Aluminum Liquid", "Materials Science and Technology" (No. 2, 2014), it is pointed out that iron elements will undergo obvious diffusion under high-temperature aluminum liquid, forming FeA1 intermetallic compounds, which are distributed in a wavy shape at the interface between the iron-based of the aluminum suction pipe and the aluminum liquid, and the top presents a regular "tongue shape" extending into the iron-based interior. During the combination process, the "tongue shape" on the iron-based side is mainly Fe2Al5, while the side close to the aluminum liquid is FeAl3. Under the action of stress, the Fe2Al5 part will fall off from the iron-based and dissolve into the aluminum liquid, which is both the reason for the perforation failure of the aluminum suction pipe and one of the factors leading to the reduction of aluminum liquid purity. Summary of the Invention

[0005] Therefore, this application provides a method for manufacturing an aluminum suction pipe to solve the problem of poor quality of existing aluminum suction pipes due to casting defects.

[0006] To achieve the above object, this application provides the following technical solutions:

[0007] A method for manufacturing an aluminum suction pipe, comprising the following steps:

[0008] Step 1. Design of metal mold and internal cavity core: The external shape of the aluminum suction pipe is machined by a segmenting machine to form a metal mold, and the internal cavity of the aluminum suction pipe is formed by making a coated sand core;

[0009] Step 2. Making of dosing ladle: Insert the coated sand core into the metal mold, and assemble the coated sand core and the metal mold as a whole onto the casting machine. The metal mold and the coated sand core form a mold cavity; A dosing ladle is arranged at the entrance of the casting machine corresponding to the end of the metal mold, and the outlet of the dosing ladle communicates with the mold cavity;

[0010] Step 3. Vacuum pumping treatment: After the metal mold is closed, vacuum pumping treatment is carried out on the coated sand core and the metal mold;

[0011] Step 4. Casting and solidification:

[0012] 1) In the initial state, the metal mold and the coated sand core are in a horizontal state. Inject a certain amount of molten iron into the dosing ladle and carry out slag cleaning treatment;

[0013] 2) Then, start the casting machine, and the metal mold and the coated sand core on the casting machine start to rotate. As the metal mold rotates, the molten iron is steadily injected into the interior of the mold cavity;

[0014] 3) When the metal mold rotates to the vertical position, wait for the molten iron in the mold cavity to solidify for a period of time;

[0015] 4) After the molten iron solidifies, rotate the metal mold back to the initial horizontal position, and then open the mold to take out the aluminum suction pipe casting.

[0016] Optionally, the metal mold is made by combining multiple split segments, which includes multiple upper molds and multiple lower molds corresponding to the upper molds. The upper molds, lower molds and the casting machine are fixedly connected by screws;

[0017] Both the upper mold and the lower mold are provided with runners communicating with the dosing ladle; The material of the dosing ladle is refractory material.

[0018] Optionally, both the inner and outer surfaces of the aluminum suction pipe casting are provided with a composite nano-scale inorganic non-metallic material layer; The composite nano-scale inorganic non-metallic material layer sequentially includes a tightly bonded layer, a transition layer and a non-aluminum-adhering layer, and the tightly bonded layer is connected to the surface of the aluminum suction pipe casting.

[0019] Optionally, the material of the tightly bonded layer includes cobalt oxide, nickel oxide, boron trioxide, silicon dioxide and nano-materials, and is sintered at a temperature of 850 °C to 880 °C for 40 minutes to 100 minutes.

[0020] Optionally, the inorganic materials of the transition layer include boron trioxide, silicon dioxide, sodium oxide, barium oxide, potassium oxide, lithium oxide, aluminum oxide, silicon nitride and nano materials, and are sintered at a temperature of 850°C to 870°C.

[0021] Optionally, the inorganic materials of the aluminum liquid non-sticking layer include aluminum phosphate, silicon nitride, titanium aluminate, silicon dioxide, aluminum oxide and nano materials, and are sintered at a temperature of 850°C to 880°C.

[0022] Optionally, the casting machine sequentially includes an upper mold plate, a lower mold plate, a support plate and a bottom plate. The metal mold is arranged between the upper mold plate and the lower mold plate. The metering package is located at the front end of the metal mold. A rotary oil cylinder is arranged between the support plate and the bottom plate, and a top mold oil cylinder is arranged between the support plate and the lower mold plate.

[0023] Compared with the prior art, the present application has at least the following beneficial effects:

[0024] 1. Based on further analysis and research of the problems in the prior art, the present application provides a method for manufacturing an aluminum suction pipe. By adopting a combination of a metal mold and a coated sand core, the generation of sand holes is effectively avoided; by removing slag in the metering package, the injection of impurities in the molten iron into the mold cavity is reduced; reasonable casting diversion, rotary casting and vacuum pumping technologies are also adopted, so that the molten iron can flow stably, avoiding the generation of air holes and iron beans. In particular, the application of rotary casting and vertical solidification technologies effectively solves the problems of sand core bending caused by the buoyancy of molten iron and uneven wall thickness of the aluminum suction pipe, improving the overall quality of the aluminum suction pipe.

[0025] 2. The present application also coats a composite high-grade inorganic non-metallic nano material layer on the contact surface between the aluminum suction pipe and the aluminum liquid, effectively improving the service life of the aluminum suction pipe, reducing the pollution of iron elements to the aluminum liquid, ensuring the purity of the aluminum liquid, and at the same time enhancing the performance and durability of the aluminum suction pipe when sucking and transporting high-temperature aluminum liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more intuitively illustrate the prior art and the present application, the following exemplary drawings are given. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application; for example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / removal / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional proportional relationships, etc. based on the technical concept disclosed in the present application and the exemplary drawings.

[0027] Figure 1 It is a schematic structural diagram of an aluminum suction pipe provided by an embodiment of the present application;

[0028] Figure 2Schematic diagram of the coated sand core corresponding to the A pipe of the aluminum suction pipe provided by an embodiment of the present application;

[0029] Figure 3 Structural schematic of the casting machine provided by an embodiment of the present application Figure 1 (Unboxed);

[0030] Figure 4 Structural schematic of the casting machine provided by an embodiment of the present application Figure 2 (Boxed);

[0031] Figure 5 Structural schematic of the casting machine provided by an embodiment of the present application Figure 3 (The metal mold is rotated to 45°);

[0032] Figure 6 Structural schematic of the casting machine provided by an embodiment of the present application Figure 4 (The metal mold is rotated to 90°);

[0033] Figure 7 Structural schematic of the casting machine provided by an embodiment of the present application Figure 5 (Casting completed);

[0034] Figure 8 For Figure 3 Schematic of the metal mold in Figure 1 ;

[0035] Figure 9 For Figure 3 Schematic of the metal mold in Figure 2 .

[0036] Explanation of reference numerals:

[0037] 1. Metal mold; 101. Upper mold; 102. Lower mold; 103. Runner;

[0038] 2. Casting machine; 201. Upper template; 202. Lower template; 203. Support plate; 204. Bottom plate; 205. Support frame; 206. Rotary oil cylinder; 207. Top mold oil cylinder; 208. Guide pillar; 209. Rotary shaft; 210. Counterweight; 211. Dosage package;

[0039] 3. A pipe; 4. B pipe; 5. C pipe; 6. Coated sand core. Detailed implementation manners

[0040] The present application will be further described in detail below with reference to the accompanying drawings through specific embodiments.

[0041] In the description of this application: Unless otherwise specified, "a plurality of" means two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects being referred to, and do not have special significance in terms of technical connotations (for example, they should not be understood as emphasizing importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0042] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually indications of the general relative position for the convenience of intuitively understanding with reference to the drawings, and are not absolute limitations on the position relationship in the actual product.

[0043] The aluminum suction pipe is a conveying pipe that sucks molten aluminum from the electrolytic aluminum molten pool in an aluminum factory into the transfer vehicle under negative pressure. The aluminum suction pipe is divided into an A pipe 3, a B pipe 4, and a C pipe 5 that are connected in sequence, as Figure 1 shown. This application provides a method for manufacturing an aluminum suction pipe. Refer to Figures 2 - 9 , which specifically includes the following steps:

[0044] Step 1. Design of the metal mold 1 and the internal cavity core: The external shape of the aluminum suction pipe is formed by machining with a segmenting machine to form a metal mold 1, and the internal cavity of the aluminum suction pipe is formed by making a coated sand core 6; The metal mold 1 is made of copper, steel, or cast iron and is used to form the external shape of the aluminum suction pipe; The coated sand core 6 is a sand core made of coated sand and is a hollow structure used to form the internal shape of the aluminum suction pipe;

[0045] Step 2. Manufacture of the dosing ladle 211: Insert the coated sand core 6 into the metal mold 1, and assemble the coated sand core 6 and the metal mold 1 as a whole onto the casting machine 2. The metal mold 1 and the coated sand core 6 form a mold cavity; A dosing ladle 211 is arranged at the entrance of the casting machine 2 corresponding to the end of the metal mold 1, and the outlet of the dosing ladle 211 is communicated with the mold cavity; The function of the dosing ladle 211 is to reduce the entry of impurities into the molten iron and ensure the quality of the casting;

[0046] Step 3. Vacuum treatment: After the metal mold 1 is closed, vacuum treatment is performed on the coated sand core 6 and the metal mold 1; This step is to further reduce the porosity and inclusions in the casting;

[0047] Step 4. Casting and solidification:

[0048] 1) As Figure 3 , Figure 4 shown, in the initial state, the metal mold 1 and the coated sand core 6 are in a horizontal state. A certain amount of molten iron is injected into the dosing ladle 211, and slag cleaning is performed;

[0049] 2) Then, start the casting machine 2. The metal mold 1 and the coated sand core 6 on the casting machine 2 start to rotate. As the metal mold 1 rotates, molten iron is steadily poured into the interior of the mold cavity, as shown in Figure 5 , Figure 6 .

[0050] 3) As shown in Figure 6 , when the metal mold 1 rotates to the vertical position, wait for the molten iron in the mold cavity to solidify for a period of time.

[0051] 4) After the molten iron has solidified, rotate the metal mold 1 back to the initial horizontal position, and then open the mold to remove the aluminum suction pipe casting, as shown in Figure 7 .

[0052] Preferably, to improve the durability of the metal mold 1, as shown in Figure 8 , Figure 9 , the metal mold 1 is made by combining multiple separate sections. This not only facilitates manufacturing and assembly but also disperses stress during repeated use of hot and cold cycles, extending the service life of the mold. It includes multiple upper molds 101 and corresponding multiple lower molds 102, and the upper molds 101, lower molds 102 are fixedly connected to the casting machine 2 by screws.

[0053] Further preferably, both the front ends of the upper mold 101 and the lower mold 102 are provided with runners 103 connected to the dosing ladle 211. Molten iron flows into the space between the metal mold 1 and the coated sand core 6 through the runners 103 connected to the dosing ladle 211. The dosing ladle 211 is made of refractory material, which can maintain stable performance under high-temperature conditions.

[0054] The above casting method of the aluminum suction pipe adopts the combination of the metal mold 1 and the coated sand core 6, effectively avoiding the generation of sand holes. At the same time, by removing slag in the dosing ladle 211, impurities in the molten iron injected into the mold cavity are reduced. In addition, reasonable casting diversion, rotary casting and vacuum pumping technologies are also adopted, enabling the molten iron to flow stably and avoiding the generation of air holes and iron beans. Especially the application of rotary casting and vertical solidification technologies effectively solves the problems of sand core bending caused by the buoyancy of molten iron and uneven wall thickness of the aluminum suction pipe.

[0055] To improve the service life of the aluminum suction pipe and reduce the pollution of aluminum liquid by iron elements, a layer of high-grade inorganic non-metallic nanomaterial is compounded on the surface of the aluminum suction pipe in contact with the aluminum liquid. This material neither wets the aluminum liquid nor peels off from the pipe body during the hot and cold cycling of the aluminum suction pipe, thus effectively blocking the contact between the aluminum liquid and the iron base. In addition, this inorganic non-metallic nanomaterial layer can also solve the laminar flow phenomenon (i.e., the liquid flow velocity is stratified, and the part close to the inner wall of the aluminum suction pipe has a slower flow velocity), reducing the adsorption of filter slag on the inner wall of the aluminum suction pipe. The following is a detailed description of this composite nano-scale inorganic non-metallic material layer:

[0056] Composite nano - scale inorganic non - metallic material layers are provided on both the inner and outer surfaces of the aluminum - absorbing pipe casting. The composite nano - scale inorganic non - metallic material layer includes a tightly - binding layer, a transition layer, and an aluminum - liquid - non - sticking layer. The transition layer is located between the tightly - binding layer and the aluminum - liquid - non - sticking layer, and the tightly - binding layer is connected to the surface of the aluminum - absorbing pipe casting.

[0057] Preferably, the material of the tightly - binding layer includes cobalt oxide, nickel oxide, boron trioxide, silicon dioxide, and nano - materials, and is sintered at a temperature of 850 °C to 880 °C for 40 minutes to 100 minutes; the thickness of the tightly - binding layer is 0.05 mm to 0.1 mm.

[0058] Function of the tightly - binding layer: It tightly binds and penetrates with the iron - based (i.e., the aluminum - absorbing pipe manufactured by the above - mentioned aluminum - absorbing pipe manufacturing method) to form a solid base layer, providing stable support for the subsequent coating.

[0059] Further preferably, the inorganic materials of the transition layer include boron trioxide, silicon dioxide, sodium oxide, barium oxide, potassium oxide, lithium oxide, aluminum oxide, silicon nitride, and nano - materials, and are sintered at a temperature of 850 °C to 870 °C; the thickness of the transition layer is 0.08 mm to 0.12 mm.

[0060] Function of the transition layer: As a bridge between the tightly - binding layer and the aluminum - liquid - non - sticking layer, it enhances the adhesion and stability of the overall coating.

[0061] Still further preferably, the inorganic materials of the aluminum - liquid - non - sticking layer include aluminum phosphate, silicon nitride, titanium aluminate, silicon dioxide, aluminum oxide, and nano - materials, and are sintered at a temperature of 850 °C to 880 °C; the thickness of the aluminum - liquid - non - sticking layer is 0.1 mm to 0.2 mm.

[0062] Function of the aluminum - liquid - non - sticking layer: It prevents aluminum liquid from condensing and adhering to the surface of the aluminum - absorbing pipe, ensuring the smooth flow of aluminum liquid.

[0063] After the surface of the aluminum - absorbing pipe manufactured by the above - mentioned aluminum - absorbing pipe manufacturing method is cleaned, the composite nano - scale inorganic non - metallic material layer is coated on the surface of the aluminum - absorbing pipe casting, and then fired by high - temperature calcination; First, the tightly - binding layer is coated on the inner and outer surfaces of the aluminum - absorbing pipe casting, and calcined - cooled using the above - mentioned process parameters; Then, the transition layer is coated on the tightly - binding layer, and calcined - cooled continuously; The aluminum - liquid - non - sticking layer is coated on the transition layer, and calcined - cooled continuously; Finally, the aluminum - absorbing pipe is inspected to ensure that the composite nano - scale inorganic non - metallic material layer coated on its surface is uniform and defect - free.

[0064] Purpose of setting the composite nano - scale inorganic non - metallic material layer on the inner and outer surfaces of the aluminum - absorbing pipe:

[0065] Non-sticking aluminum property: The composite nano-scale inorganic non-metallic material layer adopts a three-layer structure, and nano materials are added to all three layers, enabling the aluminum suction pipe not to adhere to the aluminum liquid when sucking and transporting aluminum liquid at 940 °C, and no aluminum liquid and slag will condense on the surface.

[0066] Durability: Through experimental verification, after multiple times of sucking and transporting aluminum liquid, the inorganic material layer on the surface of the aluminum suction pipe will not peel off or crack.

[0067] Flow rate improvement: The inorganic nano material layer on the inner surface of the aluminum suction pipe is not wetted by the aluminum liquid, which increases the flow rate of the aluminum liquid on the pipe wall, reduces the laminar flow phenomenon, and improves the suction and transportation efficiency.

[0068] Comprehensive performance: Through the treatment of inorganic nano materials on the inner and outer surfaces, the disadvantages of cast iron and cast steel aluminum suction pipes being easily eroded and blocked by aluminum liquid are changed. It not only retains the strength and rigidity of the iron aluminum suction pipe but also has the durability of the ceramic layer not being wetted by aluminum liquid and not being corroded.

[0069] This inorganic layer (i.e., the composite nano-scale inorganic non-metallic material layer) blocks the direct contact between the aluminum liquid and the iron base of the aluminum suction pipe, so the thermite reaction and the chemical combination between iron and aluminum in the existing methods have no conditions. Therefore, the service life of the aluminum suction pipe is greatly extended, and the purity of the aluminum liquid during transportation is also higher.

[0070] For the specific structure of the above casting machine 2, see Figures 3 - 7 , which successively includes an upper mold plate 201, a lower mold plate 202, a support plate 203, and a bottom plate 204. A support frame 205 and a rotary oil cylinder 206 are arranged between the support plate 203 and the bottom plate 204; guide columns 208 penetrate longitudinally through the four corners of the upper mold plate 201, the lower mold plate 202, and the support plate 203, and a top mold oil cylinder 207 is arranged at the middle position of the support plate 203 and the lower mold plate 202. The metal mold 1 is arranged between the upper mold plate 201 and the lower mold plate 202. Specifically, the upper mold 101 is fixed to the bottom of the upper mold plate 201, the lower mold 102 is fixed to the upper part of the lower mold plate 202, and the dosing ladle 211 is located at the front end of the metal mold 1;

[0071] The upper end of the support frame 205 is connected to both sides of the support plate 203 through a rotating shaft 209. One end of the rotary oil cylinder 206 is hinged to the bottom plate 204, and the other end of the rotary oil cylinder 206 is hinged to both sides of the support plate 203; a counterweight 210 is also arranged on the front side of the bottom of the support plate 203 to balance the torque during the rotation of the mold.

[0072] The pouring process of the casting machine 2 is as follows: Taking the A pipe 3 as an example, the corresponding coated sand core 6 (resin sand core, see Figure 2 ) of the A pipe 3 is placed into the lower mold 102 (lower metal cavity), in the "unassembled mold" state, as shown in Figure 3As shown; the top die oil cylinder 207 extends, and the lower die plate 202 and the lower die 102 (lower metal cavity) are integrally moved upward to the upper die 101 (upper metal cavity) and are in the "flask closing" position, as Figure 4 shown; then, after pouring molten iron into the dosing ladle 211, the rotary oil cylinder 206 extends, and the metal mold 1 (metal cavity) rotates 90 degrees around the rotation axis 209 (see Figure 5 , Figure 6 ); when the metal mold 1 rotates, the molten iron is steadily poured into the metal mold 1. The pouring time is 10 seconds. The pouring gradually changes from the initial parallel pouring to vertical pouring. During the entire pouring process, the coated sand core 6 is affected by the buoyancy of the molten iron. When the metal mold 11 rotates to 90 degrees vertically, it is in a state where it no longer bears the buoyancy. The coated sand core 6 solidifies in the vertical state when the molten metal solidifies. After the pouring is completed, it is cooled for 1 minute. The rotary oil cylinder 206 contracts, and the metal mold 1 rotates 90 degrees to the "flask closing" position and becomes horizontal. The top die oil cylinder 207 contracts, and the lower die plate 202 and the lower die 102 move downward. At this time, the metal mold 11 is opened, and the A-tube 3 casting is taken out, see Figure 7 ; The casting methods of the B-tube 4 and the C-tube 5 are the same as those of the A-tube 3.

[0073] In summary, the present application uses a special casting process to cast defect-free aluminum suction pipe castings, and composes a high-grade inorganic non-metallic nanomaterial layer on the contact surface with the aluminum liquid, effectively improving the service life of the aluminum suction pipe, reducing the pollution of iron elements to the aluminum liquid, ensuring the purity of the aluminum liquid, and at the same time enhancing the performance and durability of the aluminum suction pipe when sucking and transporting high-temperature aluminum liquid.

[0074] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be regarded as within the scope described in this specification.

Claims

1. A method for manufacturing an aluminum suction pipe, characterized in that, It includes the following steps: Step 1, Design of metal mold and internal cavity core: The external shape of the aluminum suction pipe is machined by a segmenting machine to form a metal mold, and the internal cavity of the aluminum suction pipe is made by a coated sand core; Step 2, Production of dosing ladle: Insert the coated sand core into the metal mold, and assemble the coated sand core and the metal mold as a whole onto the casting machine. The metal mold and the coated sand core form a mold cavity; A dosing ladle is provided at the entrance of the casting machine corresponding to the end of the metal mold, and the outlet of the dosing ladle is communicated with the mold cavity; Step 3, Vacuum treatment: After the metal mold is closed, vacuum treatment is carried out on the coated sand core and the metal mold; Step 4, Casting and solidification: 1) In the initial state, the metal mold and the coated sand core are in a horizontal state. A certain amount of molten iron is injected into the dosing ladle, and slag cleaning is carried out; 2) Then, start the casting machine, and the metal mold and the coated sand core on the casting machine start to rotate. As the metal mold rotates, the molten iron is steadily injected into the interior of the mold cavity; 3) When the metal mold rotates to the vertical position, wait for the molten iron in the mold cavity to solidify for a period of time; 4) After the molten iron solidifies, rotate the metal mold back to the initial horizontal position, and then open the mold to take out the aluminum suction pipe casting.

2. The method for manufacturing an aluminum suction pipe according to claim 1, wherein, The metal mold is made by combining multiple split segments, and it includes multiple upper molds and multiple lower molds corresponding to the upper molds. The upper molds, lower molds and the casting machine are fixedly connected by screws; Both the upper mold and the lower mold are provided with runners communicated with the dosing ladle; The material of the dosing ladle is refractory material.

3. The manufacturing method of the aluminum suction pipe according to claim 1, wherein Both the inner and outer surfaces of the aluminum suction pipe casting are provided with a composite nano-scale inorganic non-metallic material layer; The composite nano-scale inorganic non-metallic material layer sequentially includes a tightly bonded layer, a transition layer and an aluminum liquid non-sticking layer, and the tightly bonded layer is connected to the surface of the aluminum suction pipe casting.

4. The method for manufacturing an aluminum suction pipe according to claim 3, characterized in that, The material of the tightly bonded layer includes cobalt oxide, nickel oxide, boron trioxide, silicon dioxide and nano-materials, and is sintered at a temperature of 850 °C to 880 °C for 40 minutes to 100 minutes.

5. The method for manufacturing an aluminum suction tube according to claim 3 or 4, characterized in that, The inorganic materials of the transition layer include boron trioxide, silicon dioxide, sodium oxide, barium oxide, potassium oxide, lithium oxide, aluminum oxide, silicon nitride and nano-materials, and are sintered at a temperature of 850 °C to 870 °C.

6. The method for manufacturing an aluminum suction pipe according to claim 3 or 4, characterized in that, The inorganic materials of the aluminum liquid non-sticking layer include aluminum phosphate, silicon nitride, titanium aluminate, silicon dioxide, aluminum oxide and nano-materials, and are sintered at a temperature of 850 °C to 880 °C.

7. The method for manufacturing an aluminum suction pipe according to claim 1, characterized in that The casting machine sequentially includes an upper template, a lower template, a support plate and a bottom plate. The metal mold is arranged between the upper template and the lower template. The dosing ladle is located at the front end of the metal mold. A rotary oil cylinder is arranged between the support plate and the bottom plate, and a mold lifting oil cylinder is arranged between the support plate and the lower template.

Images