Injection system suitable for preparing large ring piece

Abstract

The injection system suitable for preparing the large ring piece comprises a liquid guide structure, a plurality of injection structures are evenly arranged in the circumferential direction of the liquid guide structure, and molten aluminum liquid can be injected; the moving structure is arranged below the liquid guide structure and comprises a moving platform, an annular mold is arranged at the top of the moving platform, the moving platform can drive the annular mold to rotate, the annular mold can receive the molten aluminum liquid sprayed out of the spraying structure, and finally the molten aluminum liquid can form an annular piece; molten aluminum liquid is sprayed out at the same time through the multiple spraying structures, the situation that the covering path of the spraying structures is too long when a single spraying structure is used is avoided, and therefore it is guaranteed that new molten aluminum liquid can be combined with molten aluminum liquid in a semi-solid state below when being sprayed down; therefore, the annular part with better tissue compactness and uniformity can be obtained, and the forming quality of the annular part is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of ingot casting equipment, and particularly relates to a spraying system suitable for preparing large ring parts. Background Art

[0002] Aluminum alloy ring parts are typical rotary components in the structure of a launch vehicle body. They have a relatively large diameter and a small height, and are mostly used as transition rings for liquid launch vehicle storage tanks, and are connected to the tank bottom, cylinder section, and short shell through welding. Currently, there are mainly two forming processes for aluminum alloy ring parts. One is the free forging process, in which a "hole expanding" operation is performed on a ring blank through a large press, and then the expanded blank is subjected to heat treatment and machining to obtain an integral ring part without welds. The other is the radial-axial rolling forming process, that is, rolling force is applied to the ring blank through rollers to cause local plastic deformation, so that while the wall thickness and height of the ring part decrease, the diameter increases. However, both of these processes have problems such as a long manufacturing cycle and low production efficiency.

[0003] The melt impact method of liquid metal 3D printing technology can adjust the motion trajectory of the motion system and the nozzle distribution of the spraying system to print ring parts. The obtained ring parts have characteristics such as dense structure, fine grains, and uniform composition. With subsequent heat treatment technology, the performance requirements of aerospace ring parts can be met, greatly reducing the manufacturing cycle and improving production efficiency.

[0004] In the existing technology, the melt impact method of liquid metal 3D printing equipment all adopts a single spraying system, that is, all nozzles are concentrated in one place, which is not applicable to large-sized ring parts. Typical products of aerospace aluminum alloy ring parts are transition rings with diameters of 2.25 m, 3.35 m, and 5 m. Taking the 2.25 m diameter ring part as an example, its circumference can reach 7.065 m. If a single spraying system is adopted, to ensure the combination of two layers of metal in a semi-solid state, the motion platform needs to rotate at a high speed, which will cause problems such as unstable spraying, gas entrainment, and slag entrainment, resulting in poor quality of the ring part. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a spraying system suitable for preparing large ring parts.

[0006] In a first aspect, the present application provides a spraying system suitable for preparing large ring parts, including:

[0007] A liquid guiding structure, the top of the liquid guiding structure is provided with a first communication port communicating with its interior for receiving molten aluminum liquid, and a plurality of spraying structures communicating with its interior are uniformly arranged circumferentially on the liquid guiding structure for spraying out the molten aluminum liquid;

[0008] The moving structure is arranged below the liquid guiding structure. The moving structure includes a moving platform, and a ring-shaped mold is arranged on the top of the moving platform. The ring-shaped mold can accommodate the molten aluminum liquid ejected from the ejection structure. By driving the ring-shaped mold to rotate through the moving platform, the molten aluminum liquid entering the ring-shaped mold can form a ring-shaped part.

[0009] According to the technical solution provided by the embodiment of the present application, the liquid guiding structure includes a first liquid guiding pipe. The first liquid guiding pipe has a first axis, and a first communication port communicating with its interior is opened at the top of the first liquid guiding pipe.

[0010] The liquid guiding structure further includes a plurality of second liquid guiding pipes. The plurality of second liquid guiding pipes are circumferentially and uniformly arranged on the circumferential side wall of the bottom of the first liquid guiding pipe, and the second liquid guiding pipes are internally communicated with the first liquid guiding pipe.

[0011] According to the technical solution provided by the embodiment of the present application, the ejection structure includes a nozzle head. The nozzle head is conductively arranged at one end of the second liquid guiding pipe far from the first liquid guiding pipe, and its length direction extends along the radial direction of the first liquid guiding pipe.

[0012] The ejection structure further includes a plurality of nozzles. The plurality of nozzles are arranged in a row along the length direction of the nozzle head, and the nozzles are communicated with the nozzle head.

[0013] According to the technical solution provided by the embodiment of the present application, the nozzle is an inverted cone structure, the diameter of its top is larger than the diameter of its bottom, and the bottom diameters of the plurality of nozzles gradually increase along the direction away from the first liquid guiding pipe.

[0014] According to the technical solution provided by the embodiment of the present application, a heat preservation structure is further included. The heat preservation structure includes a heat preservation furnace. The heat preservation furnace is arranged on the top of the first liquid guiding pipe and is used to accommodate the molten aluminum liquid. A second communication port is opened at the bottom of the heat preservation furnace, and the second communication port is communicated with the first communication port.

[0015] The heat preservation structure further includes an aluminum liquid baffle. The aluminum liquid baffle is arranged between the heat preservation furnace and the first liquid guiding pipe and is used to isolate the molten aluminum liquid.

[0016] According to the technical solution provided by the embodiment of the present application, heat preservation sleeves are arranged on both the first liquid guiding pipe and the second liquid guiding pipe.

[0017] According to the technical solution provided by the embodiment of the present application, the number of the second liquid guiding pipes is set according to the inner diameter of the ring-shaped part to be prepared, and there is:

[0018] πd / 1.2 < n < πd / 0.8

[0019] Wherein, n is the number of the second liquid guide pipes, and d is the inner diameter of the annular member.

[0020] In summary, the present technical solution specifically discloses a spraying system applicable to the preparation of large-sized annular members, including a liquid guiding structure. A first communication port is opened at the top of the liquid guiding structure, which can receive molten aluminum liquid, and a plurality of spraying structures are uniformly arranged circumferentially on the liquid guiding structure, which can spray molten aluminum liquid; it also includes a moving structure. The moving structure is arranged below the liquid guiding structure. The moving structure includes a moving platform, on the top of which an annular mold is arranged. The moving platform is driven by a power source and can drive the annular mold to rotate. The annular mold can receive the molten aluminum liquid sprayed from the spraying structure, and finally the molten aluminum liquid can form an annular member.

[0021] By spraying molten aluminum liquid simultaneously through a plurality of spraying structures, it is avoided that when using a single spraying structure, the covering path of the spraying structure is too long, so as to avoid the complete solidification of the existing molten aluminum liquid below when the new molten aluminum liquid is sprayed down. Thus, it is ensured that when the new molten aluminum liquid is sprayed down, it can be combined with the semi-solid molten aluminum liquid below, so that an annular member with better tissue density and uniformity can be obtained, and the forming quality of the annular member is improved. Description of the Drawings

[0022] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present application will become more obvious:

[0023] Figure 1 It is a schematic diagram of a spraying system applicable to the preparation of large-sized annular members.

[0024] Figure 2 It is a schematic diagram of the liquid guiding structure.

[0025] Figure 3 It is a schematic diagram of the spraying structure.

[0026] Figure 4 It is a flowchart of a preparation method.

[0027] Reference numerals in the figures: 1, molten aluminum liquid; 2, moving platform; 3, annular mold; 4, annular member; 5, first liquid guide pipe; 6, second liquid guide pipe; 7, nozzle head; 8, nozzle; 9, holding furnace; 10, aluminum liquid baffle. Detailed Embodiments

[0028] The following further describes the present application in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0029] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in conjunction with the embodiments.

[0030] Embodiment 1

[0031] Please refer to Figure 1 the schematic diagram of a spraying system suitable for preparing large ring parts shown in the figure. A spraying system suitable for preparing large ring parts includes a liquid guiding structure. The liquid guiding structure includes a first liquid guiding pipe 5. The first liquid guiding pipe 5 has a first axis, and the first axis extends along a first direction. The first direction is Figure 1 the vertical direction in the figure. A first communication port communicating with its interior is opened at the top of the first liquid guiding pipe 5. Optionally, the first liquid guiding pipe 5 is a circular pipe, and the material is heat-resistant cast steel to ensure its heat-resistant stability and service life.

[0032] As Figure 2 shown in the figure, the liquid guiding structure further includes a plurality of second liquid guiding pipes 6. The plurality of second liquid guiding pipes 6 are circumferentially and uniformly arranged on the circumferential side wall at the bottom of the first liquid guiding pipe 5. The two ends of the second liquid guiding pipe 6 are respectively a first end and a second end. Among them, the first end is connected to the first liquid guiding pipe 5 and is in communication with the interior of the first liquid guiding pipe 5. Optionally, the first end and the first liquid guiding pipe 5 are connected by full welding. The second end is provided with a spraying structure. Optionally, the second liquid guiding pipe 6 is a square pipe, and the material is heat-resistant cast steel to ensure its heat-resistant stability and service life.

[0033] As Figure 3 shown in the figure, the spraying structure includes a nozzle 7. The nozzle 7 is arranged at the end of the second liquid guiding pipe 6 far from the first liquid guiding pipe 5 and is in communication with the second liquid guiding pipe 6. And the length direction of the nozzle 7 extends along the radial direction of the first liquid guiding pipe 5. Optionally, the nozzle 7 and the second liquid guiding pipe 6 are connected by full welding. The material of the nozzle 7 is heat-resistant cast steel.

[0034] The spraying structure further includes a plurality of nozzles 8. The plurality of nozzles 8 are arranged in a row along the length direction of the nozzle 7 at the bottom of the nozzle 7 and are in communication with the nozzle 7. Optionally, the nozzles 8 are made of "cast steel - ceramic" composite material.

[0035] The nozzles 8 are in an inverted cone structure, the diameter of the top is larger than the diameter of the bottom, and the bottom diameters of the plurality of nozzles 8 gradually increase along the direction away from the second liquid guiding pipe 6 to match the difference in the liquid supply amounts of the inner and outer diameters of the ring part 4.

[0036] A motion structure is arranged below the liquid guiding structure and is coaxially arranged with the liquid guiding structure.

[0037] Specifically, the motion structure includes a motion platform 2. Driven by a power source, the motion platform 2 can rotate around the first axis. An annular mold 3 is coaxially arranged on the top of the motion platform 2. By rotating the motion platform 2, the annular mold 3 can be driven to rotate. The top of the annular mold 3 is open, and the opening is located directly below the nozzle 8. Therefore, the molten aluminum liquid 1 ejected from the nozzle 8 can enter the annular mold 3 and finally form an annular part 4. Optionally, the power source is a motor.

[0038] A heat preservation structure is arranged above the liquid guiding structure;

[0039] Specifically, the heat preservation structure includes a heat preservation furnace 9. The heat preservation furnace 9 is arranged on the top of the first liquid guiding pipe 5. A second communication port is opened at the bottom of the heat preservation furnace 9 corresponding to the first communication port, and the first communication port and the second communication port are connected;

[0040] Furthermore, the heat preservation structure further includes an aluminum liquid baffle 10. The aluminum liquid baffle 10 is arranged between the heat preservation furnace 9 and the first liquid guiding pipe 5 and can open and close the passage between the first communication port and the second communication port;

[0041] The heat preservation furnace 9 is used to contain the molten aluminum liquid 1. By moving the aluminum liquid baffle 10 to open the passage between the first communication port and the second communication port, the molten aluminum liquid 1 enters the first liquid guiding pipe 5, then enters the second liquid guiding pipe 6, and then sprays out from the nozzle 8. The ejected molten aluminum liquid 1 enters the rotating annular mold 3 and can finally become an annular part 4.

[0042] It should be noted that heat preservation sleeves are arranged on both the first liquid guiding pipe 5 and the second liquid guiding pipe 6. The heat preservation sleeves are made of heat preservation cotton and glass cloth and can keep the molten aluminum liquid 1 entering the first liquid guiding pipe 5 and the second liquid guiding pipe 6 warm to ensure that the molten aluminum liquid 1 is always in a molten state.

[0043] It should be noted that the desired thickness of the annular part 4 can be obtained by blocking the corresponding nozzle 8 with molybdenum wire, and the inner diameter of the annular part can be adjusted. An example is as follows:

[0044] When all the nozzles 8 are opened, an annular part with an inner diameter of 2 m and a thickness of 0.5 m can be obtained;

[0045] By blocking half of the nozzles 8 close to the second liquid guiding pipe 6 with molybdenum wire, an annular part 4 with an inner diameter of 2.5 m and a thickness of 0.25 m can be obtained;

[0046] By blocking half of the nozzles 8 far from the second liquid guiding pipe 6 with molybdenum wire, an annular part 4 with an inner diameter of 2 m and a thickness of 0.25 m can be obtained.

[0047] It should be noted that the number of the second liquid guiding pipes 6 is set according to the inner diameter of the annular part 4 to be prepared, and there is the following formula:

[0048] πd / 1.2 < n < πd / 0.8

[0049] Wherein, n is the number of the second liquid guide pipes 6, and d is the inner diameter of the annular member 4.

[0050] Embodiment 2

[0051] A preparation method, which applies an injection system proposed in Embodiment 1 and suitable for preparing large annular members, as Figure 4 shown, the preparation method includes:

[0052] S1. First, start the power source to drive the movement platform 2 to rotate, so that the movement platform 2 drives the annular mold 3 to rotate;

[0053] Specifically, 3 - 5 minutes before preparation, start the power source to make the power source drive the movement platform 2 to rotate around the first axis at a set angular velocity, so that the movement platform 2 drives the annular mold 3 to rotate around the first axis at a set angular velocity;

[0054] S2. Transfer the molten aluminum liquid 1 to the heat preservation furnace 9, and move the aluminum liquid baffle 10 away, so as to open the passage between the first communication port and the second communication port, and make the molten aluminum liquid 1 enter the liquid guide structure;

[0055] Specifically, before preparation, the aluminum liquid baffle 10 is located between the heat preservation furnace 9 and the first liquid guide pipe 5, the passage between the first communication port and the second communication port is in a closed state, transfer the smelted molten aluminum liquid 1 to the heat preservation furnace 9, and perform degassing, slag removal and sufficient stirring in the heat preservation furnace 9. When starting the preparation, move the aluminum liquid baffle 10 away, open the passage between the first communication port and the second communication port, so that the molten aluminum liquid 1 enters the first liquid guide pipe 5 and enters a plurality of second liquid guide pipes 6;

[0056] S3. The molten aluminum liquid 1 enters the nozzle 7 from the second liquid guide pipe 6 and is sprayed into the annular mold 3 from the nozzle 8;

[0057] S4. By pressurizing the inside of the heat preservation furnace 9, the molten aluminum liquid 1 forms a stable jet flow;

[0058] Specifically, the molten aluminum liquid 1 in a plurality of second liquid guide pipes 6 is simultaneously sprayed into the annular mold 3 from the nozzle 8. To ensure the stability of the jet flow and control the jet flow velocity, pressurize the inside of the heat preservation furnace 9. Optionally, pressurize with an inert gas, and the inert gas is preferably argon or nitrogen;

[0059] S5. The molten aluminum liquid 1 enters the rotating annular mold 3 and finally solidifies into an annular member 4;

[0060] It should be noted that, during the preparation process, by controlling parameters such as the rotation speed of the annular mold 3, the cooling intensity and the jet flow intensity, it is ensured that the top layer of molten aluminum liquid 1 in the annular mold 3 is combined with the newly impacted molten aluminum liquid 1 in a semi-solid state, thereby ensuring good metallurgical quality and microstructure.

[0061] Working principle: before preparation, first start the power source to drive the motion platform 2 and the annular mold 3 to rotate around the first axis, control the power source to make the annular mold 3 rotate at a set angular velocity, and transfer the smelted molten aluminum liquid 1 to the insulation furnace 9. At this time, the aluminum liquid baffle 10 is located between the insulation furnace 9 and the first liquid guide tube 5, and the passage between the first connecting port and the second connecting port is in a closed state. The molten aluminum liquid 1 is degassed, deslagging and fully stirred in the insulation furnace 9. When the preparation starts, remove the aluminum liquid baffle 10, open the passage between the first connecting port and the second connecting port, allow the molten aluminum liquid 1 to enter the first liquid guide tube 5, and disperse into multiple second liquid guide tubes 6, and be sprayed out through the nozzle 8. The sprayed molten aluminum liquid 1 enters the rotating annular mold 3 and is finally condensed to form an annular part 4;

[0062] Therefore, the molten aluminum liquid 1 can be sprayed simultaneously through multiple second liquid guide tubes 6 and nozzles 8 arranged thereon, avoiding a single group of nozzles 8 causing the nozzle 8 to cover a too long path, and solving the problem that when the new molten aluminum liquid 1 is sprayed down, the existing molten aluminum liquid 1 below is completely solidified, which is prone to poor bonding. By spraying multiple groups of nozzles 8 at the same time, the coverage path of a single group of nozzles 8 is shortened, so that the upper layer of molten aluminum liquid 1 and the lower layer of molten aluminum liquid 1 are combined in a semi-solid state, and at the same time, they can be better matched with the moving structure, so that the annular member 4 with better tissue density and uniformity can be obtained.

[0063] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A spraying system suitable for preparing large ring parts, characterized in that: include: A liquid guiding structure, wherein a first communication port is provided at the top of the liquid guiding structure and is connected to the interior thereof, and is used to receive the molten aluminum liquid (1); and a plurality of injection structures are evenly arranged around the liquid guiding structure and are connected to the interior thereof, and are used to eject the molten aluminum liquid (1); A motion structure is arranged below the liquid guiding structure, the motion structure comprises a motion platform (2), a ring-shaped mold (3) is arranged on the top of the motion platform (2), the ring-shaped mold (3) can accommodate the molten aluminum liquid (1) ejected from the ejection structure, the ring-shaped mold (3) is driven to rotate by the motion platform (2), and the molten aluminum liquid (1) enters the ring-shaped mold (3) to form a ring-shaped part (4).

2. A spraying system suitable for preparing large ring parts according to claim 1, characterized in that: The liquid guiding structure comprises a first liquid guiding tube (5), the first liquid guiding tube (5) having a first axis, and the top of the first liquid guiding tube (5) is provided with the first communication port connected with the interior thereof; The liquid guiding structure further comprises a plurality of second liquid guiding tubes (6), wherein the plurality of second liquid guiding tubes (6) are evenly arranged on the circumferential side wall of the bottom of the first liquid guiding tube (5), and the second liquid guiding tubes (6) are internally connected to the first liquid guiding tube (5).

3. A spraying system suitable for preparing large ring parts according to claim 2, characterized in that: The spray structure comprises a spray head (7), the spray head (7) being arranged at an end of the second liquid guiding tube (6) away from the first liquid guiding tube (5), and having a length direction extending radially along the first liquid guiding tube (5); The spraying structure further comprises a plurality of nozzles (8), wherein the plurality of nozzles (8) are arranged at the bottom of the nozzle (7) along the length direction of the nozzle (7), and the nozzles (8) are connected to the nozzle (7).

4. A spraying system suitable for preparing large ring parts according to claim 3, characterized in that: The nozzle (8) is an inverted cone structure, the top diameter of which is larger than the bottom diameter, and the bottom diameters of the plurality of nozzles (8) gradually increase in a direction away from the first liquid guiding tube (5).

5. A spraying system suitable for preparing large ring parts according to claim 4, characterized in that: It also includes a heat-insulating structure, the heat-insulating structure including a heat-insulating furnace (9), the heat-insulating furnace (9) is arranged on the top of the first liquid guide pipe (5) and is used to contain the molten aluminum liquid (1), and a second communication port is opened at the bottom of the heat-insulating furnace (9), and the second communication port is connected to the first communication port; The heat-insulating structure further comprises an aluminum liquid baffle (10), wherein the aluminum liquid baffle (10) is arranged between the heat-insulating furnace (9) and the first liquid guide pipe (5) and is used to isolate the molten aluminum liquid (1).

6. A spraying system suitable for preparing large ring parts according to claim 5, characterized in that: The first liquid guiding tube (5) and the second liquid guiding tube (6) are both provided with a thermal insulation sleeve.

7. A spraying system suitable for preparing large ring parts according to claim 6, characterized in that: The number of the second liquid guiding tubes (6) is set according to the inner diameter of the annular member (4) to be prepared, and includes: πd / 1.2 <n<πd / 0.8 Wherein, n is the number of the second liquid guiding tubes (6), and d is the inner diameter of the annular member (4).

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