Copper-aluminum composite casting system with low gas content

Abstract

The utility model relates to a low-gas-content copper-aluminum composite casting system which comprises a copper melting furnace, a copper heat preservation furnace, a deoxidizing device, a copper-aluminum composite furnace, an aluminum melting furnace, an aluminum heat preservation furnace and a hydrogen removing device. The deoxidizing device is used for blowing inert gas into copper liquid of the copper heat preservation furnace, and the copper heat preservation furnace is communicated with the copper-aluminum composite furnace through a channel. The aluminum melting furnace is communicated with the aluminum heat preservation furnace, the dehydrogenation device is arranged in the aluminum heat preservation furnace and used for blowing inert gas into molten aluminum of the aluminum heat preservation furnace, and the aluminum heat preservation furnace is communicated with the copper-aluminum composite furnace through a second conveying channel. The inert gas is introduced into the copper liquid and the aluminum liquid respectively, the inert gas enables the copper liquid and the aluminum liquid to roll over, the deoxidizing and dehydrogenating effects are achieved, the purity of the copper liquid and the aluminum liquid is improved, the casting quality is improved, and continuous and large-scale production of the copper-aluminum compound system is achieved.

Description

Technical Field

[0001] This utility model relates to the field of casting system technology, specifically to a copper-aluminum composite casting system with low gas content. Background Technology

[0002] Currently, copper-aluminum composite materials are an energy-saving conductor material. They possess the conductivity of copper and the low density of aluminum. The length of a copper-aluminum composite busbar with the same cross-sectional area is about twice that of a copper busbar, which can effectively save copper resources. In the field of electrical engineering, it has become a substitute for pure copper busbars.

[0003] The gas content of molten copper and aluminum is crucial to product quality. Higher gas content makes castings more prone to porosity and oxide impurities, negatively impacting casting quality. Furthermore, molten copper continuously produces slag during smelting. Some of this slag floats to the surface of the copper, while the rest adheres to the inner wall of the furnace. This slag accumulation on the furnace wall affects heat transfer performance, thus impacting the smelting effect. Utility Model Content

[0004] This invention addresses existing technical problems by providing a copper-aluminum composite casting system with low gas content.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A copper-aluminum composite casting system with low gas content includes a copper melting furnace, a copper holding furnace, a deoxygenation device, a copper-aluminum composite furnace, an aluminum melting furnace, an aluminum holding furnace, and a hydrogen removal device. The copper melting furnace is connected to the copper holding furnace through a first conveying channel. The deoxygenation device is used to blow inert gas into the copper liquid in the copper holding furnace. The copper holding furnace is connected to the copper-aluminum composite furnace through a channel. The aluminum melting furnace is connected to the aluminum holding furnace. The aluminum holding furnace is equipped with the hydrogen removal device, which is used to blow inert gas into the aluminum liquid in the aluminum holding furnace. The aluminum holding furnace is connected to the copper-aluminum composite furnace through a second conveying channel.

[0006] Preferably, the deoxygenation device is located at the bottom of the copper insulation furnace. The deoxygenation device includes a connected air inlet pipe and an air inlet chamber. The top wall of the air inlet chamber is a honeycomb-shaped permeable brick, and the top wall of the air inlet chamber is provided with multiple permeable brick holes.

[0007] Preferably, the first conveying channel is inclined, and the first conveying channel slopes downward from the copper melting furnace to the copper holding furnace.

[0008] Preferably, the angle δ of the first conveying channel is 20° to 30°.

[0009] Preferably, the first conveying channel includes a copper liquid through hole, and the outer side of the copper liquid through hole is provided with a high-temperature resistant protective coating and a refractory sintering layer in sequence.

[0010] Preferably, the high-temperature resistant protective coating is made of boron nitride and / or silicon nitride, and the refractory sintering layer is a refractory mortar sintering layer.

[0011] Preferably, the hydrogen removal device is located at the bottom of the aluminum insulation furnace, and the hydrogen removal device includes a connected air blowing pipe and an air blowing chamber, with a plurality of capillary air blowing holes provided on the top wall of the air blowing chamber.

[0012] Preferably, the second conveying channel includes an aluminum liquid through hole, and an inner casting layer, a heating layer, a heat insulation layer and an outer shell are sequentially provided on the outer side of the aluminum liquid through hole.

[0013] Preferably, the inner casting layer is made of aluminosilicate refractory castable, the insulation layer is made of ceramic fiber high-temperature resistant insulation cotton, the heating layer is made of heating wire, and the outer shell is made of metal.

[0014] Based on the above technical solution, the present invention can be further improved as follows:

[0015] The beneficial effects of this invention are as follows: By introducing inert gas into the copper holding furnace, the inert gas causes the molten copper to tumble, achieving a deoxygenation effect and reducing turbulence and eddies in the molten copper. This allows the molten copper to flow stably into the copper-aluminum composite furnace. Furthermore, the fine bubbles can carry non-metallic inclusions (such as oxides and sulfides) in the molten copper to the surface, helping to purify the copper and improve casting quality. By introducing inert gas into the molten aluminum, the tumbling and slag formation of the aluminum can be accelerated, increasing the purity of the aluminum and reducing its hydrogen content, further improving casting quality and enabling continuous and large-scale production of the copper-aluminum composite system. The molten copper in the copper melting furnace is transported to the copper holding furnace through an inclined first conveying channel, causing slag in the molten copper to accumulate within the copper holding furnace. This facilitates slag removal, solves the problem of slag accumulation on the inner wall of the copper melting furnace affecting the copper melting effect, and improves heating efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the copper-aluminum composite casting system of this utility model;

[0017] Figure 2 This is a partial cross-sectional schematic diagram of the deoxygenation device of this utility model;

[0018] Figure 3 This is a schematic diagram of the permeable brick holes in the deoxygenation device of this utility model;

[0019] Figure 4 This is a partial cross-sectional schematic diagram of the first conveying channel of this utility model;

[0020] Figure 5 This is a partial cross-sectional schematic diagram of the hydrogen removal device of this utility model;

[0021] Figure 6 This is a schematic diagram of the capillary air blowing hole of this utility model;

[0022] Figure 7 This is a partial cross-sectional schematic diagram of the second conveying channel of this utility model.

[0023] The attached diagrams are labeled as follows: 1. Copper melting furnace; 2. First conveying channel; 2.1. High-temperature resistant protective coating; 2.2. Refractory sintering layer; 3. Copper heat preservation furnace; 4. Deoxygenation device; 4.1. Air inlet pipe; 4.2. Air inlet chamber; 4.3. Perforated brick hole; 5. Copper-aluminum composite furnace; 6. Aluminum melting furnace; 7. Aluminum heat preservation furnace; 8. Hydrogen removal device; 8.1. Air blowing pipe; 8.2. Air blowing chamber; 8.3. Capillary air blowing hole; 9. Second conveying channel; 9.1. Inner casting layer; 9.2. Heating layer; 9.3. Heat preservation layer; 9.4. Outer shell. Detailed Implementation

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] like Figures 1 to 7As shown, this utility model discloses a low-gas-content copper-aluminum composite casting system, including a copper melting furnace 1, a copper holding furnace 3, a deoxygenation device 4, a copper-aluminum composite furnace 5, an aluminum melting furnace 6, an aluminum holding furnace 7, and a hydrogen removal device 8. The copper melting furnace 1 is connected to the copper holding furnace 3 through a first conveying channel 2. The deoxygenation device 4 is used to blow inert gas, specifically argon, into the molten copper in the copper holding furnace 3. The copper holding furnace 3 is connected to the copper-aluminum composite furnace 5 through a channel, enabling the molten copper to flow into the copper-aluminum composite furnace 5. Oxide inclusions and excessive dissolved oxygen can cause defects such as pores and cracks inside the casting, reducing the mechanical properties and corrosion resistance of the casting. By introducing inert gas into the molten copper, the gas enters as tiny bubbles. These bubbles adsorb and carry dissolved gases, including oxygen, to the surface and eventually escape from the copper, thus reducing the dissolved oxygen content, purifying the copper, and ensuring casting quality. Furthermore, the inert gas improves the fluidity of the copper, allowing it to flow more evenly into the copper-aluminum composite furnace 5. The aluminum melting furnace 6 is connected to the aluminum holding furnace 7 via an aluminum molten metal channel. The aluminum holding furnace 7 is equipped with a hydrogen removal device 8, which blows inert gas (argon) into the aluminum molten metal in the holding furnace 7. The aluminum holding furnace 7 is connected to the copper-aluminum composite furnace 5 via a second conveying channel 9. This second conveying channel 9 is set at a 90° angle to buffer the direct flow of the aluminum molten metal, preventing flow rate fluctuations from affecting the copper-aluminum composite casting and improving casting quality. The solubility of hydrogen in molten aluminum decreases significantly with decreasing temperature. When molten aluminum cools and solidifies, supersaturated hydrogen precipitates and forms bubbles. If these bubbles cannot escape in time, they will remain inside the casting, forming pores. By blowing inert gas into the molten aluminum, the hydrogen dissolved in the aluminum can be effectively carried to the surface in the form of tiny bubbles, thereby greatly reducing the number of pores in the casting and further ensuring the quality of the copper-aluminum composite casting. The specific structure and heating temperature parameters of copper melting furnace 1, copper holding furnace 3, copper-aluminum composite furnace 5, aluminum melting furnace 6, and aluminum holding furnace 7 adopt existing technology and will not be described in detail here.

[0026] In this embodiment, the deoxygenation device 4 is located at the bottom of the copper holding furnace 3, which increases the flow path of inert gas, improves the deoxygenation effect, and further improves the fluidity of the copper liquid, so that it flows evenly into the copper-aluminum composite furnace 5, thereby reducing casting defects. The deoxygenation device 4 includes a connected air inlet pipe 4.1 and an air inlet chamber 4.2. The gap between the air inlet pipe 4.1 and the bottom wall of the copper holding furnace 3 is sealed with graphite wool to prevent the copper liquid from flowing out. Specifically, the inner diameter of the air inlet pipe 4.1 is φ13mm-φ15mm to ensure sufficient air intake. The top wall of the air inlet chamber 4.2 is made of honeycomb permeable bricks, and multiple permeable brick holes 4.3 are provided on the top wall of the air inlet chamber 4.2. The inert gas in the air inlet chamber 4.2 is diverted through the multiple permeable brick holes 4.3 and blown into the copper liquid, improving the uniformity of the distribution of inert gas in the copper liquid, improving the deoxygenation effect, and ensuring that the oxygen content in the copper liquid does not exceed 5ppm. The oxygen content of the solidified copper liquid sample can be detected by a hydrogen-oxygen tester. The permeable brick holes 4.3 allow inert gases such as argon and nitrogen to pass through, while preventing the penetration of molten copper liquid. Therefore, inert gas can be introduced into the molten copper liquid during the casting process. The honeycomb structure allows inert gas to be evenly dispersed into the molten copper, forming small and uniformly distributed bubbles. This reduces casting defects such as shrinkage cavities and porosity, thus improving casting quality. Simultaneously, by continuously introducing inert gas into the copper holding furnace 3, a protective atmosphere is formed inside, isolating the furnace from oxygen in the air. This reduces the possibility of oxidation on the surface of the molten copper, preventing the formation of an oxide film and ensuring the surface quality of the castings.

[0027] Furthermore, the honeycomb permeable bricks of the deoxygenation device 4 are laid flat inside the copper holding furnace 3 and / or the honeycomb permeable bricks are set on the inner wall of the copper holding furnace 3, which further improves the uniformity of the distribution of inert gas in the copper holding furnace 3, realizes uniform deoxygenation, and improves the deoxygenation effect and the uniformity of copper liquid flow.

[0028] The first conveying channel 2 is located between the copper melting furnace 1 and the copper holding furnace 3. The first conveying channel 2 is inclined, running downwards from the copper melting furnace 1 to the copper holding furnace 3. By inclining the first conveying channel 2, the flow of molten copper is improved, and the slag can flow through the first conveying channel 2 into the copper holding furnace 3. Since the function of the copper holding furnace 3 is to stabilize the molten copper within a certain temperature range, the slag has good fluidity, making it easier to remove with slag removal tools. This solves the problem of slag accumulation on the inner wall of the copper melting furnace 1, which affects the smelting effect.

[0029] Furthermore, the inclination angle δ of the first conveying channel 2 is 20° to 30°, and the length of the first conveying channel 2 is 280mm-350mm. In this embodiment, the inclination angle of the first conveying channel 2 is 25°. When the inclination angle is greater than 30°, the opening height of the first conveying channel 2 in the copper melting furnace 1 is relatively high, causing a large amount of copper solution in the copper melting furnace 1 to not flow normally into the copper holding furnace 3, wasting copper solution, and slag is prone to accumulate in the space below the opening of the first conveying channel 2 in the copper melting furnace 1, affecting the heating effect of the copper melting furnace 1; when the inclination angle is less than 20°, the inclination angle is too small, affecting the flow rate of copper solution and the amount of slag flowing into the copper holding furnace 3, thereby affecting the quality of copper and aluminum casting and the cleaning effect of slag.

[0030] Furthermore, the opening of the first conveying channel 2 inside the copper holding furnace 3 is adjacent to the bottom wall of the copper holding furnace 3. In order to achieve the maximum cross-sectional flow, the cross-sectional shape of the first conveying channel 2 is rectangular, which ensures the smooth flow of copper liquid and facilitates the accumulation of slag inside the copper holding furnace 3, so as to facilitate the cleaning of slag.

[0031] Specifically, the first conveying channel 2 includes a copper liquid through hole with a diameter of φ160mm-φ180mm. A high-temperature resistant protective coating 2.1 and a refractory sintering layer 2.2 are sequentially provided on the outer side of the copper liquid through hole. Specifically, the high-temperature resistant protective coating 2.1 is made of boron nitride and / or silicon nitride, and has a thickness of 2mm-3.5mm. It possesses good corrosion resistance and thermal stability, ensuring normal flow of the copper liquid and extending the service life of the first conveying channel 2. The refractory sintering layer 2.2 is a refractory mortar sintering layer, specifically a refractory mortar made of aluminosilicate material, which possesses high mechanical strength and thermal stability, and also has a heat insulation effect, ensuring the temperature of the copper liquid.

[0032] In this embodiment, the hydrogen removal device 8 is located at the bottom of the aluminum holding furnace 7, increasing the flow path of inert gas, improving the hydrogen removal effect, further improving the fluidity of the molten aluminum, allowing it to flow evenly into the copper-aluminum composite furnace 5, reducing casting defects in the copper-aluminum composite billet, and ensuring casting quality. Specifically, the hydrogen removal device 8 includes a connected blowing pipe 8.1 and a blowing chamber 8.2. The top wall of the blowing chamber 8.2 is provided with multiple capillary blowing holes 8.3, which are arranged in a matrix to achieve uniform blowing of air into the aluminum holding furnace 7. The diameter of the blowing pipe 8.1 is φ18mm-φ20mm, and the diameter of the capillary blowing holes 8.3 is φ0.5mm-φ1mm. Before the molten aluminum flows into the aluminum holding furnace 7, the hydrogen removal device 8 is turned on to continuously blow air, keeping the blowing pressure of the inert gas at 5 kPa. This prevents the molten aluminum from clogging the capillary blowing holes 8.3, allowing the inert gas to be evenly dispersed into the molten aluminum through the capillary blowing holes 8.3, forming small bubbles. This more effectively captures and removes hydrogen, accelerates the tumbling and slag formation of the molten aluminum, improves the purity of the molten aluminum, and forms molten aluminum with a hydrogen content of no more than 3 ppm. The hydrogen content can be detected by a hydrogen-oxygen analyzer on a solidified sample of the molten aluminum.

[0033] The second conveying channel 9 is located below the aluminum melting furnace 6 and the aluminum holding furnace 7. It relies on the static liquid level difference pressure of the aluminum liquid to flow. The aluminum liquid is transported through the closed second conveying channel 9 to realize the continuous conveying of aluminum liquid, improve the conveying efficiency of aluminum liquid, reduce the contact between aluminum liquid and air, significantly reduce oxide inclusions, ensure the quality of castings, and reduce heat loss to ensure the stability of aluminum liquid temperature.

[0034] The second conveying channel 9 includes an aluminum liquid through hole with a diameter of φ200mm-φ220mm. The outer side of the aluminum liquid through hole is provided with, from the inside out, an inner casting layer 9.1, a heating layer 9.2, a heat insulation layer 9.3, and an outer shell 9.4. Specifically, the inner casting layer 9.1 is made of aluminum silicate refractory castable with a thickness of 12mm-18mm, possessing high-temperature stability and corrosion resistance, and preventing aluminum liquid penetration to ensure the integrity of the second conveying channel 9. The heating layer 9.2 uses heating wires. When the casting flow rate is slow, the second conveying channel 9 is a high-risk area for aluminum liquid temperature drop. Installing heating wires on the second conveying channel 9 can prevent the aluminum liquid from solidifying due to a rapid temperature drop, ensuring normal casting of copper-aluminum composite castings. The insulation layer 9.3 is made of ceramic fiber high-temperature resistant insulation cotton, and its thickness is 4mm-10mm. It prevents heat loss from the molten aluminum, ensures the quality of the casting, and reduces the risk of molten aluminum solidification. The outer shell 9.4 is made of metal, preferably an iron shell, to ensure the overall mechanical strength of the second conveying channel 9 and to have a certain thermal expansion compensation effect, thus ensuring the service life of the second conveying channel 9.

[0035] The working process of this copper-aluminum composite casting system is as follows:

[0036] Molten copper enters copper holding furnace 3 from copper melting furnace 1. Under the combined action of first conveying channel 2 and deoxygenation device 4, it forms molten copper with an oxygen content of no more than 5 ppm. Molten aluminum enters aluminum holding furnace 7 from aluminum melting furnace 6. After passing through hydrogen removal device 8, it forms molten aluminum with a hydrogen content of no more than 3 ppm. The two molten metals are then combined and enter copper-aluminum composite furnace 5 to complete the composite casting process. This utility model provides a systematic composite casting system for copper and aluminum with low gas content, maximizing the continuous and large-scale production of bimetallic composite continuous casting of molten copper and aluminum, improving production efficiency and casting quality.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A copper-aluminum composite casting system with low gas content, characterized in that, The system includes a copper melting furnace (1), a copper holding furnace (3), a deoxygenation device (4), a copper-aluminum composite furnace (5), an aluminum melting furnace (6), an aluminum holding furnace (7), and a hydrogen removal device (8). The copper melting furnace (1) is connected to the copper holding furnace (3) through a first conveying channel (2). The deoxygenation device (4) is used to blow inert gas into the copper liquid in the copper holding furnace (3). The copper holding furnace (3) is connected to the copper-aluminum composite furnace (5) through a channel. The aluminum melting furnace (6) is connected to the aluminum holding furnace (7). The aluminum holding furnace (7) is equipped with the hydrogen removal device (8). The hydrogen removal device (8) is used to blow inert gas into the aluminum liquid in the aluminum holding furnace (7). The aluminum holding furnace (7) is connected to the copper-aluminum composite furnace (5) through a second conveying channel (9).

2. The low-gas-content copper-aluminum composite casting system according to claim 1, characterized in that, The deoxygenation device (4) is located at the bottom of the copper heat preservation furnace (3). The deoxygenation device (4) includes a connected air inlet pipe (4.1) and an air inlet chamber (4.2). The top wall of the air inlet chamber (4.2) is a honeycomb permeable brick, and multiple permeable brick holes (4.3) are provided on the top wall of the air inlet chamber (4.2).

3. The low-gas-content copper-aluminum composite casting system according to claim 1 or 2, characterized in that, The first conveying channel (2) is inclined and slopes downward from the copper melting furnace (1) to the copper holding furnace (3).

4. The low-gas-content copper-aluminum composite casting system according to claim 3, characterized in that, The first conveying channel (2) is tilted at an angle δ of 20° to 30°.

5. The low-gas-content copper-aluminum composite casting system according to claim 4, characterized in that, The first conveying channel (2) includes a copper liquid through hole, and a high-temperature resistant protective coating (2.1) and a refractory sintering layer (2.2) are sequentially provided on the outside of the copper liquid through hole.

6. The low-gas-content copper-aluminum composite casting system according to claim 5, characterized in that, The high-temperature resistant protective coating (2.1) is made of boron nitride and / or silicon nitride, and the refractory sintering layer (2.2) is a refractory mortar sintering layer.

7. The low-gas-content copper-aluminum composite casting system according to claim 1, characterized in that, The hydrogen removal device (8) is located at the bottom of the aluminum heat preservation furnace (7). The hydrogen removal device (8) includes a connected air blowing pipe (8.1) and an air blowing chamber (8.2). The top wall of the air blowing chamber (8.2) is provided with a plurality of capillary air blowing holes (8.3).

8. The low-gas-content copper-aluminum composite casting system according to claim 1 or 7, characterized in that, The second conveying channel (9) includes an aluminum liquid through hole, and the outer side of the aluminum liquid through hole is provided with an inner casting layer (9.1), a heating layer (9.2), a heat insulation layer (9.3) and an outer shell (9.4) in sequence.

9. The low-gas-content copper-aluminum composite casting system according to claim 8, characterized in that, The inner casting layer (9.1) is made of aluminosilicate refractory castable, the insulation layer (9.3) is made of ceramic fiber high-temperature resistant insulation cotton, the heating layer (9.2) is made of heating wire, and the outer shell (9.4) is made of metal.

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