3D printing device for printing space devices

Abstract

The present application relates to space device printing equipment technical field, especially for space device printing 3D printing equipment, including impregnation part and printing part, the impregnation part includes impregnation shell, tension roller and first guide roller are arranged in the impregnation shell, the impregnation shell is also provided with the fiber impregnation yarn spreading device located in the front of the first guide roller, the fiber impregnation yarn spreading device includes the fish-shaped spreading impregnation plate that is straight and arches to the front, the front side surface of the fish-shaped spreading impregnation plate forms fish-shaped spreading surface, the impregnation shell is also provided with the second guide roller located below the back of the fish-shaped spreading impregnation plate and the first-stage guide die in the front of the second guide roller, and the impregnation effect is good.

Description

Technical Field

[0001] This invention relates to the field of aerospace equipment printing technology, and particularly to 3D printing equipment for printing aerospace components. Background Technology

[0002] Continuous fiber reinforced specialty engineering plastic consumables consist of two raw materials: specialty engineering plastics with high melting temperature and high bulk strength, and continuous fibers. Many existing equipment suffers from difficulties in fiber wetting during the impregnation process due to the high viscosity of the thermoplastic resin and the use of impregnation rollers. Dry yarns often remain inside the filament bundle. Furthermore, the high molding temperature and melt viscosity of the thermoplastic resin necessitate long manufacturing lines and large floor space requirements. Therefore, structures designed to address these issues have emerged.

[0003] For example, Chinese Patent Application No. 201610943222.6 discloses an impregnation device and method for preparing 3D printing consumables. The device includes a closed shell with an insulation layer, and fiber preheating die, tension roller, guide roller, fish-shaped impregnation roller, guide dies at various levels and final die arranged sequentially inside the shell.

[0004] Although the aforementioned existing device uses a fish-shaped impregnation roller, it is not good enough in terms of implementation details. The stress on the fiber bundle is not uniform enough, and the impregnation effect of the single filament is not uniform enough, so the performance of the consumables cannot meet the requirements for the production of high-quality aerospace equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a 3D printing device with good impregnation effect for printing aerospace components.

[0006] The above-mentioned objective of the present invention is achieved through the following technical solution: a 3D printing device for printing aerospace devices, comprising an impregnation part and a printing part, wherein the impregnation part includes a tension roller and a first guide roller disposed in the impregnation housing, and a fiber impregnation and spreading device located in front of the first guide roller is further disposed in the impregnation housing, wherein the fiber impregnation and spreading device includes a fish-shaped spreading impregnation plate that is upright and arches forward, the front surface of the fish-shaped spreading impregnation plate forming a fish-shaped spreading surface, and a second guide roller located behind and below the fish-shaped spreading impregnation plate and a primary guide die in front of the second guide roller are further disposed in the impregnation housing.

[0007] As a preferred embodiment of the present invention, the long axis of the yarn spreading plate extends in the vertical direction and the short axis extends in the front-to-back direction.

[0008] As a preferred embodiment of the present invention, the front side of the yarn spreading plate is provided with arc-shaped fiber guide rods that are spaced apart along the outer peripheral path of the fish-shaped yarn spreading surface.

[0009] As a preferred embodiment of the present invention, the distance between the arc-shaped fiber guide bar and the fish-shaped yarn spreading surface gradually decreases and then gradually increases from top to bottom.

[0010] As a preferred embodiment of the present invention, the arc-shaped fiber guide rod is movable back and forth.

[0011] As a preferred embodiment of the present invention, the arc-shaped fiber guide bar has a circular cross-section, and the opening of the arc-shaped fiber guide bar faces backward and is used to compress the front part of the fiber.

[0012] As a preferred embodiment of the present invention, the fish-shaped yarn spreading and impregnating plate includes a steel plate portion and a plastic plate portion that are stacked and fixed together.

[0013] As a preferred embodiment of the present invention, the steel plate portion is detachably mounted and fixed on the plastic plate portion.

[0014] As a preferred embodiment of the present invention, a rearwardly extending insertion block is formed on the rear side of the steel plate portion, and a rearwardly extending insertion groove is formed on the plastic plate portion for the insertion block to be inserted rearwardly.

[0015] As a preferred embodiment of the present invention, the left and right ends of the arc-shaped fiber guide rod are respectively fixed with vibration damping and limiting posts for abutting against the surface of the steel plate portion.

[0016] The beneficial effects of this invention are: better fiber bundle unfolding effect, more uniform fiber stress, and better uniformity of impregnation after unfolding, thereby greatly improving the overall performance of consumables and making them suitable for the preparation of aerospace equipment with high-quality requirements. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the front part of the impregnated shell in the 3D printing equipment of the embodiment after being cut open;

[0018] Figure 2 yes Figure 1 A schematic diagram of the fiber bundle impregnation process in a 3D printing device.

[0019] Figure 3 yes Figure 1 A schematic diagram of the three-dimensional structure of the fish-shaped yarn-spreading impregnation plate in its disassembled state. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. 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 are within the scope of the claims of the present invention.

[0022] Examples, such as Figure 1-3 As shown, a 3D printing device for printing aerospace components includes a resin impregnation section and a printing section. The resin impregnation section includes a resin impregnation housing 1, a tension roller 2 disposed within the resin impregnation housing 1, and a first guide roller 31. The resin impregnation housing 1 can adopt an existing housing structure, and the first guide roller 31 can adopt an existing guide roller structure. The most significant feature of this application is:

[0023] The impregnation housing 1 also includes a fiber impregnation and spreading device located in front of the first guide roller 31. This device includes a vertical, forward-arching fish-shaped spreading impregnation plate 4. The fish-shaped spreading impregnation plate 4 can be half of a conventional fish-shaped impregnation roller, i.e., half of it is cut along a plane perpendicular to the minor axis, and this half acts as the front side. That is, the front surface of the fish-shaped spreading impregnation plate 4 forms a fish-shaped spreading surface 41. In this way, the fiber bundle spreads and widens from top to bottom, then converges downwards at the maximum minor axis position, greatly improving the uniformity of impregnation and ensuring more balanced force in the circumferential, normal, and front-back directions. Importantly, the impregnation housing 1 also includes a second guide roller 32 located below and behind the fish-shaped spreading impregnation plate 4, and a primary guide die 5 in front of the second guide roller 32. This allows the fiber bundle 7 to be completely abutted against the fish-shaped spreading impregnation plate. On the fish-shaped yarn spreading surface 41 on the front side of the yarn impregnation plate 4, the existing lying structure, when the fiber bundle is taut, the front and rear ends will not adhere to the surface of the fish-shaped impregnation roller. If the ends are forcibly squeezed, it may cause the fibers to break. However, in this embodiment, the fiber bundle can bypass the lower rear part of the first guide roller 31 and be wound forward from top to bottom to better adhere to the fish-shaped yarn spreading surface 41. Then it extends backward and bypasses the rear half of the second guide roller 32 and also moves from top to bottom. Then it enters the first-level guide die 5. Of course, a second-level guide die and a final die will also be provided. Then the consumable after the fiber bundle is impregnated enters the print head of the printing part for printing. During this process, the fiber bundle is spread out by the upright fish-shaped yarn spreading impregnation plate 4, that is, the fiber bundle is spread out as a single filament for impregnation and then bundled and conveyed forward. The fibers form a "Z" shape on the fish-shaped yarn spreading impregnation plate 4, which has better adhesion and better unfolding impregnation effect. It can also be seen that the major axis of the yarn spreading plate 4 extends in the vertical direction and the minor axis extends in the front-to-back direction.

[0024] Preferably, the front side of the spreading plate 4 is provided with arc-shaped fiber guide rods 6 distributed at intervals along the outer periphery of the fish-shaped spreading surface 41. The arc-shaped fiber guide rods 6 apply pressure to the front side of the fiber bundle. Since the rear side of the fiber bundle is pressed onto the fish-shaped spreading and impregnating plate 4 for compression and deformation, but there is no corresponding force-bearing structure on the front side, the shape of the front and rear sides of the fiber is not very uniform. Through the design of the arc-shaped fiber guide rods 6, the fiber is spread and impregnated between the fish-shaped spreading and impregnating plate 4 and the arc-shaped fiber guide rods 6, and the force on the front and rear sides will be more uniform, thereby improving the impregnation effect and improving the quality of consumables.

[0025] Furthermore, the distance between the arc-shaped fiber guide rod 6 and the fish-shaped yarn spreading surface 41 gradually decreases and then gradually increases from top to bottom. This is because initially, the fiber bundle needs to be pressed to spread and flatten, reaching its thinnest point near the middle of the fish-shaped yarn spreading surface 41. Then, it needs to converge downwards, so the distance gradually increases again. In other words, there are multiple arc-shaped fiber guide rods 6, with the middle one positioned horizontally at the position of its largest short axis relative to the fish-shaped yarn spreading surface 41, where the distance between them is smallest. The distance between the arc-shaped fiber guide rod 6 and the fish-shaped yarn spreading surface 41 gradually decreases both upwards and downwards. This improves the usability.

[0026] Preferably, the arc-shaped fiber guide rod 6 is movable back and forth. The impregnated housing 1 is filled with adhesive, and it can also be connected to existing high-precision cylinders or lead screw structures. The ends of the telescopic parts of these telescopic structures are connected and fixed to the arc-shaped fiber guide rod 6, making the telescopic distance of the arc-shaped fiber guide rod 6 more precise. This telescopic structure can be electrically connected to the printer's automatic control system for automated control, allowing for more precise position adjustments. Specifically, the arc-shaped fiber guide rod 6 has a circular cross-section, with its opening facing rearward and used to compress the front part of the fiber. It can also be seen that the arc-shaped fiber guide rod 6 is a C-shaped structure with its opening facing rearward.

[0027] To better implement the above solution, the fish-shaped yarn spreading and impregnating plate 4 comprises a steel plate portion 401 and a plastic plate portion 402, which are stacked and fixed together. The plastic plate has a certain degree of plasticity, which can reduce vibration and noise. In case of abnormalities, it can minimize fiber damage or breakage and protect the equipment itself. Furthermore, the plastic plate portion 402 has a heat insulation effect, reducing heat loss from the fiber bundles.

[0028] In addition, for replacement and maintenance, the steel plate portion 401 can be detachably installed and fixed on the plastic plate portion 402. The front surface of the steel plate portion 401 is the direct contact surface of the fish-shaped yarn spreading surface 41.

[0029] Based on this, a rearwardly extending insertion block 4011 is formed on the rear side of the steel plate portion 401, and a rearwardly extending insertion groove 4021 is formed on the plastic plate portion 402 for the insertion block 4011 to be inserted rearwardly. Furthermore, the plastic plate portion 402 and the insertion block 4011 have corresponding and communicating threaded holes in the vertical direction, allowing them to be fixed together by vertical bolts. During installation, the insertion block 4011 is first inserted rearward into the insertion groove 4021, and then the bolts extending vertically are tightened through the corresponding threaded holes.

[0030] The plastic plate part 402 can also be detachably connected to the impregnated housing 1. Corresponding threaded holes can be opened in the left and right directions of the plastic plate part 402 and the impregnated housing 1, and the connection can be fixed by bolts in the left and right directions.

[0031] Furthermore, vibration-damping limiting posts 61 are fixed at both ends of the arc-shaped fiber guide rod 6 to abut against the surface of the steel plate part 401. The arc-shaped fiber guide rod 6 can adopt a front-to-back splicing structure, with the front part made of plastic and the rear part made of steel. The plastic part can be connected and fixed to the telescopic structure using existing methods such as bolts. The plastic part and the steel part can be spliced ​​together by fixing them together with environmentally friendly rubber or screws, or the plastic part can be directly injection molded onto the front side of the steel part. The vibration-damping limiting posts 61 adopt a rubber column structure, which serves both as fibers on the left and right sides and as a vibration-damping effect.

[0032] The above structural design allows the fiber bundle to spread more evenly and be subjected to more uniform force as it passes through the fish-shaped yarn spreading and impregnation plate 4, resulting in a better impregnation effect and thus obtaining high-quality consumables to meet the printing needs of aerospace equipment.

[0033] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A 3D printing device for printing of aerospace parts, comprising a sizing section and a printing section, the sizing section comprising a sizing housing (1), a tension roller (2) and a first guide roller (31) arranged in the sizing housing (1), characterized in that, The impregnation housing (1) is further provided with a fiber impregnation and spreading device located in front of the first guide roller (31). The fiber impregnation and spreading device includes a fish-shaped spreading impregnation plate (4) that is upright and arches forward. The front surface of the fish-shaped spreading impregnation plate (4) forms a fish-shaped spreading surface (41). The impregnation housing (1) is also provided with a second guide roller (32) located behind and below the fish-shaped spreading impregnation plate (4) and a primary guide die (5) in front of the second guide roller (32). The long axis of the fish-shaped yarn spreading impregnation plate (4) extends vertically and the short axis extends in the front-to-back direction. The front side of the fish-shaped yarn spreading impregnation plate (4) is provided with arc-shaped fiber guide rods (6) that are spaced along the outer periphery of the fish-shaped yarn spreading surface (41). The fish-shaped yarn spreading impregnation plate (4) includes a steel plate part (401) and a plastic plate part (402) that are stacked and fixed together. The distance between the arc-shaped fiber guide rods (6) and the fish-shaped yarn spreading surface (41) gradually decreases and then gradually increases from top to bottom.

2. The 3D printing equipment for printing aerospace components according to claim 1, characterized in that, The arc-shaped fiber guide rod (6) can move back and forth.

3. The 3D printing equipment for printing aerospace components according to claim 1, characterized in that, The arc-shaped fiber guide rod (6) has a circular cross-section, and the opening of the arc-shaped fiber guide rod (6) faces backward and is used to compress the front part of the fiber.

4. The 3D printing equipment for printing aerospace components according to claim 1, characterized in that, The steel plate portion (401) is detachably installed and fixed on the plastic plate portion (402).

5. The 3D printing equipment for printing aerospace components according to claim 1, characterized in that, The steel plate portion (401) has a rearwardly extending plug block (4011) formed on its rear side, and the plastic plate portion (402) has a rearwardly extending plug groove (4021) for the plug block (4011) to be inserted rearwardly.

6. The 3D printing equipment for printing aerospace components according to claim 1, characterized in that, The left and right ends of the arc-shaped fiber guide rod (6) are respectively fixed with vibration damping limit posts (61) for abutting against the surface of the steel plate part (401).

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