Anti-deformation structure for 3D printing thin-wall part

Abstract

The anti-deformation structure comprises a first anti-deformation supporting plate, a second anti-deformation supporting plate, a third anti-deformation supporting plate and a fourth anti-deformation supporting plate, and the first anti-deformation supporting plate and the second anti-deformation supporting plate are located on the two sides of a to-be-3D-printed assembly formed by a plurality of parallel to-be-3D-printed thin-wall parts arranged at intervals correspondingly; the third anti-deformation supporting plate and the fourth anti-deformation supporting plate are located at the two ends of the to-be-3D-printed assembly The first anti-deformation supporting plate and the second anti-deformation supporting plate are both 10-150 mm away from the closest thin-wall part to be subjected to 3D printing; the third anti-deformation supporting plate and the fourth anti-deformation supporting plate are both connected with the end reserved part of the assembly to be subjected to 3D printing and the end of the first anti-deformation supporting plate and the end of the second anti-deformation supporting plate. The anti-deformation structure for the 3D printing thin-wall part and the assembly to be subjected to 3D printing are integrally formed through 3D printing. According to the anti-deformation structure for 3D printing of the thin-wall part, deformation of the thin-wall part can be controlled in the printing process, in this way, the secondary deformation risk after the workpiece is separated from the base plate can be reduced, and the workload of aftertreatment can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of additive manufacturing, and specifically relates to an anti-deformation structure for 3D printing thin-walled parts. Background Art

[0002] Additive manufacturing technology is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. Since it is not limited by the complexity of the part shape and does not require any tooling and molds, it has a very wide range of applications. As one of the additive manufacturing technologies, the selective laser sintering process has the following basic process: the powder feeding device delivers a certain amount of powder to the work surface, the powder spreading roller spreads a layer of powder material on the upper surface of the formed part of the forming cylinder, the heating device heats the powder to the set temperature, and the galvanometer system controls the laser to scan the solid part powder layer according to the cross-sectional profile of the layer, so that the powder melts and bonds with the formed part below; when a layer of cross section is sintered, the workbench drops a layer of thickness, and the powder spreading roller spreads a layer of uniform and dense powder on it, and scans and sinters a new layer of cross section, and after several layers of scanning and superposition, the entire prototype manufacturing is completed.

[0003] Due to the advantages of additive manufacturing technology such as short manufacturing cycle, complex printing structure, and integrated multi-component molding, it has been widely used in aerospace, electronic products, civil and other fields in recent years. However, there are still some problems in the selective laser sintering process that need to be continuously improved, such as the printing of thin-walled parts. During the printing process, due to the structural characteristics of the workpiece itself (long length, high height, thin thickness, etc.), the extremely fast temperature change during the sintering process, and the expansion and contraction of the material, it is easy to cause the deformation of the workpiece. In addition, the thin-walled parts themselves have poor rigidity, which aggravates their deformation. Usually, we can resist the deformation of the workpiece by adding a large number of support structures, but many thin-walled parts have flow channels inside. It is easy to break, crack, or even deform the workpiece more seriously during the support process, which not only increases a lot of post-processing workload but also increases more quality risks. These workpieces are often key parts in the assembly and use of products, and their dimensional tolerances, form and position tolerances, and density are all required to be high. If the quality and dimensional requirements are not up to standard, it will affect the use of the workpiece and even cause the workpiece to be scrapped, causing great waste. Utility Model Content

[0004] In order to solve the above technical problems existing in the prior art, the utility model provides an anti-deformation structure for 3D printing thin-walled parts, which can control the deformation of thin-walled parts during the printing process, not only reducing the risk of secondary deformation after the workpiece is separated from the substrate, but also reducing the workload of post-processing of the workpiece, while shortening the delivery cycle and reducing unnecessary quality risks in the post-processing process. Therefore, by adopting the anti-deformation structure of the present application, the deformation control of thin-walled parts is significantly improved, and the workload of post-processing is not increased, and the product qualification rate reaches more than 98%, which is more suitable for batch printing of thin-walled parts.

[0005] In order to solve the above-mentioned technical problems, the utility model provides an anti-deformation structure for 3D printing thin-walled parts, including a first anti-deformation support plate, a second anti-deformation support plate, a third anti-deformation support plate and a fourth anti-deformation support plate, wherein the first anti-deformation support plate and the second anti-deformation support plate are respectively located on both sides of a to-be-3D-printed component formed by a plurality of parallel and spaced thin-walled parts to be 3D-printed; the third anti-deformation support plate and the fourth anti-deformation support plate are respectively located at both ends of the component to be 3D-printed; and the first anti-deformation support plate and the second anti-deformation support plate are both 10 to 150 mm away from the nearest thin-walled part to be 3D-printed; the third anti-deformation support plate and the fourth anti-deformation support plate are both connected to the end reserved portion of the component to be 3D-printed and the ends of the first anti-deformation support plate and the second anti-deformation support plate; the anti-deformation structure for 3D printing thin-walled parts and the component to be 3D-printed are integrally formed through 3D printing.

[0006] As a further preferred embodiment of the present invention, the end reserved portion is formed by extending the end of each thin-walled part to be 3D printed by 0.5 mm to 1 mm in its length direction.

[0007] As a further preferred embodiment of the present invention, the spacing between adjacent thin-walled parts to be 3D printed is 0.02-1 mm.

[0008] As a further preferred embodiment of the present invention, the thin-walled parts to be 3D printed in the components to be 3D printed are identical or approximately identical.

[0009] As a further preferred embodiment of the present invention, a plurality of reinforcing ribs are provided at intervals on the side of all the first anti-deformation support plates and the second anti-deformation support plates away from the component to be 3D printed.

[0010] As a further preferred embodiment of the present invention, a plurality of reinforcing ribs are evenly spaced and arranged, and the distance between adjacent reinforcing ribs is 20 to 150 mm.

[0011] As a further preferred embodiment of the present invention, the length, height and thickness of the first anti-deformation support plate and the second anti-deformation support plate are equal to the length, height and thickness of the thin-walled part to be 3D printed.

[0012] As a further preferred embodiment of the present invention, the height of the reinforcing rib is equal to the height of the first anti-deformation support plate and / or the second anti-deformation support plate.

[0013] As a further preferred embodiment of the present invention, the thickness of the third anti-deformation support plate and the fourth anti-deformation support plate is 1-5 times the thickness of the thin-walled part to be 3D printed.

[0014] As a further preferred scheme of the present utility model, the materials of the first anti-deformation support plate, the second anti-deformation support plate, the third anti-deformation support plate and the fourth anti-deformation support plate are the same as the material of the thin-walled part to be 3D printed; and the first anti-deformation support plate and the second anti-deformation support plate have the same shape; the third anti-deformation support plate and the fourth anti-deformation support plate have the same shape.

[0015] The utility model discloses an anti-deformation structure for 3D printing thin-walled parts, comprising a first anti-deformation support plate, a second anti-deformation support plate, a third anti-deformation support plate and a fourth anti-deformation support plate, wherein the first anti-deformation support plate and the second anti-deformation support plate are respectively located at two sides of a to-be-3D-printed component formed by a plurality of parallel and spaced thin-walled parts to be 3D-printed; the third anti-deformation support plate and the fourth anti-deformation support plate are respectively located at two ends of the to-be-3D-printed component; and the first anti-deformation support plate and the second anti-deformation support plate are both 10 to 150 mm away from the closest thin-walled part to be 3D-printed; the third anti-deformation support plate and the fourth anti-deformation support plate are both connected to the end reserved portion of the to-be-3D-printed component and the ends of the first anti-deformation support plate and the second anti-deformation support plate; the anti-deformation structure for 3D printing thin-walled parts and the to-be-3D-printed component are integrally formed by 3D printing; so that the deformation of the thin-walled parts can be controlled during the printing process, which can not only reduce the risk of secondary deformation after the workpiece is separated from the substrate, but also reduce the workload of post-processing, shorten the delivery cycle, and reduce unnecessary quality risks in the post-processing process. Moreover, by adopting the anti-deformation structure of the present application, the deformation control of thin-walled parts is significantly improved without increasing the workload of post-processing, and the product qualification rate reaches more than 98%, which is more suitable for batch printing of thin-walled parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of an embodiment of the utility model provided for the anti-deformation structure of 3D printed thin-walled parts.

[0017] The parts in the figure are marked as follows:

[0018] 1. The first anti-deformation support plate, 2. The second anti-deformation support plate, 3. The third anti-deformation support plate, 4. The fourth anti-deformation support plate, 5. Reinforcing ribs, 6. The thin-walled part to be 3D printed. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand and implement the technical solution of the utility model, further detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0020] The thin-walled parts in this application refer to the ratio of the thickness to the length / height of the workpiece is less than or equal to 0.03. Due to the poor rigidity of thin-walled parts, internal stress will accumulate layer by layer during the 3D printing process. When the rigidity of the part cannot resist the internal stress, the part will deform. As the printing height increases, the internal stress becomes greater and greater. The deformation of the part will be uncontrollable and directly lead to printing failure or the formed part cannot meet the dimensional tolerance and use requirements. The conventional correction method is easy to cause the workpiece to rebound or crack, resulting in scrapping.

[0021] In order to solve the above-mentioned technical problems existing in the prior art, the present application provides an anti-deformation structure for 3D printing thin-walled parts. The anti-deformation structure is arranged around the thin-walled part 6 to be 3D printed (also called a workpiece) and has no direct contact with the workpiece. On the one hand, the deformation direction of the workpiece during the printing process is suppressed or the force generated by the anti-deformation support is offset, thereby producing a smaller or negligible deformation, so as to achieve the effect of controlling the deformation of the workpiece. On the other hand, the workpieces are arranged in parallel, and the heat generated during the forming process can be quickly transferred to the adjacent workpieces, alleviating local heat accumulation and reducing the deformation of the workpieces. During the printing process of the workpiece, the metal powder is locally melted and solidified under the action of the high-energy laser, and its temperature gradient is extremely large. If the heat inside the workpiece cannot be conducted out in time, a large and complexly distributed internal stress will be generated inside the workpiece. These internal stresses will cause the workpiece to deform or even crack. The thermal conductivity of the powder is very poor, almost zero, and during the printing process, the workpiece is surrounded by powder. If the anti-deformation structure of the present application is designed around the workpiece, the heat inside the workpiece will be indirectly transferred to the anti-deformation structure, thereby reducing the risk of deformation and cracking of the workpiece body due to excessive internal stress. On the other hand, the two ends of the printed workpiece belong to stress concentration areas and are prone to cracking. The present application adopts fixed structures (the third anti-deformation structure and the fourth anti-deformation structure) at both ends of the workpiece, which can not only reduce the risk of cracking at both ends, but also constrain the two ends of the workpiece to reduce deformation at both ends.

[0022] Based on the above innovative principles, the anti-deformation structure for 3D printing thin-walled parts of the present application is as follows: Figure 1As shown, it includes a first anti-deformation support plate 1, a second anti-deformation support plate 2, a third anti-deformation support plate 3 and a fourth anti-deformation support plate 4, wherein the first anti-deformation support plate 1 and the second anti-deformation support plate 2 are respectively located on both sides of a component to be 3D printed formed by a plurality of parallel and spaced thin-walled parts 6 to be 3D printed; the third anti-deformation support plate 3 and the fourth anti-deformation support plate 4 are respectively located at both ends of the component to be 3D printed; and the first anti-deformation support plate 1 and the second anti-deformation support plate 2 are both 10 to 150 mm away from the closest thin-walled part 6 to be 3D printed; the third anti-deformation support plate 3 and the fourth anti-deformation support plate 4 are both connected to the end reserved portion of the component to be 3D printed and the ends of the first anti-deformation support plate 1 and the second anti-deformation support plate 2; the anti-deformation structure for 3D printing thin-walled parts and the component to be 3D printed are integrally formed by 3D printing.

[0023] Before the workpiece is printed, the workpiece is designed to prevent deformation in the three-dimensional model according to the specific size and deformation requirements of the workpiece. After the design is completed, the deformation analysis is performed in the simulation software. According to the analysis results, the number, size specifications, and thickness of the anti-deformation structure can be appropriately increased or decreased, and the number of reinforcing ribs 5 inside the anti-deformation structure can also be increased or decreased. Through simulation analysis and comprehensive comparison, the most economical, reliable, and time-saving anti-deformation structure of the present application for 3D printing thin-walled parts with specific specifications and dimensions is selected. After the workpiece model is repaired and before the support is generated (when support design is required, if support design is not required, it can be ignored), the anti-deformation structure of the application is merged with the workpiece into one. After the support design is completed, the anti-deformation structure of the present application and the workpiece are regarded as a whole, exported to the file format required for 3D printing, and printed.

[0024] In a specific implementation, the end reserved portion is formed by extending the end of each thin-walled part 6 to be 3D printed by 0.5mm to 1mm in its length direction. In this way, when the anti-deformation structure for 3D printing thin-walled parts and the component to be 3D printed of the present application are integrally formed through 3D printing, the anti-deformation structure for 3D printing thin-walled parts can be removed by cutting the end reserved portions at both ends of the component to be 3D printed to obtain a number of printed thin-walled parts.

[0025] In a specific implementation, the spacing between adjacent thin-walled parts 6 to be 3D printed is 0.02-1 mm. Of course, other specific values ​​can also be set, which are not limited in the present application.

[0026] Specifically, the thin-walled parts 6 to be 3D printed in the assembly to be 3D printed are identical or approximately identical, and the approximately identical here means that the planarity of adjacent thin-walled parts 6 to be 3D printed has a deviation of ±5% or a normal allowable error in the industry, and the shape similarity of adjacent thin-walled parts 6 to be 3D printed is greater than or equal to 95%. Of course, preferably, the thin-walled parts 6 to be 3D printed in the assembly to be 3D printed are identical, that is, completely identical, so that the 3D printing effect is better.

[0027] As the workpiece becomes higher, the ability of the first anti-deformation support plate 1 and the second anti-deformation support plate 2 to resist deformation is weakened. In order to further improve the rigidity of the first anti-deformation support plate 1 and the second anti-deformation support plate 2, a plurality of spaced reinforcing ribs 5 are provided on the side of the first anti-deformation support plate 1 and the second anti-deformation support plate 2 away from the component to be 3D printed. The number of the plurality of reinforcing ribs 5 can be specifically determined according to the length of the thin-walled part 6 to be 3D printed. Further preferably, the plurality of reinforcing ribs 5 are evenly spaced, and the distance between adjacent reinforcing ribs 5 is 20-150 mm.

[0028] Preferably, the length, height and thickness of the first anti-deformation support plate 1 and the second anti-deformation support plate 2 are equal to the length, height and thickness of the thin-walled part 6 to be 3D printed. Of course, the length, height and thickness of the first anti-deformation support plate 1 and the second anti-deformation support plate 2 may also be slightly larger than the length, height and thickness of the thin-walled part 6 to be 3D printed.

[0029] Preferably, if Figure 1 As shown, the height of the reinforcing rib 5 is equal to the height of the first anti-deformation support plate 1 and / or the second anti-deformation support plate 2, which can achieve a better anti-deformation effect.

[0030] Further preferably, the thickness of the third anti-deformation support plate 3 and the fourth anti-deformation support plate 4 is 2 to 100 mm. Since the two ends of the workpiece are locations where internal stress is concentrated and are prone to cracking during the printing process, the thickness of the third anti-deformation support plate 3 and the fourth anti-deformation support plate 4 can improve local stress concentration and strengthen the structures at both ends, thereby reducing the risk of cracking.

[0031] To facilitate 3D printing, preferably, the materials of the first anti-deformation support plate 1, the second anti-deformation support plate 2, the third anti-deformation support plate 3 and the fourth anti-deformation support plate 4 are the same as the material of the thin-walled part 6 to be 3D printed; and the first anti-deformation support plate 1 and the second anti-deformation support plate 2 have the same shape; the third anti-deformation support plate 3 and the fourth anti-deformation support plate 4 have the same shape.

[0032] The above embodiments are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. It should be pointed out that some modifications and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. An anti-deformation structure for 3D printing thin-walled parts, characterized in that: It includes a first anti-deformation support plate, a second anti-deformation support plate, a third anti-deformation support plate and a fourth anti-deformation support plate, wherein the first anti-deformation support plate and the second anti-deformation support plate are respectively located on both sides of a component to be 3D printed which is formed by a plurality of parallel and spaced thin-walled parts to be 3D printed; the third anti-deformation support plate and the fourth anti-deformation support plate are respectively located at both ends of the component to be 3D printed; and the first anti-deformation support plate and the second anti-deformation support plate are both 10 to 150 mm away from the closest thin-walled part to be 3D printed; the third anti-deformation support plate and the fourth anti-deformation support plate are both connected to the end reserved portion of the component to be 3D printed and the ends of the first anti-deformation support plate and the second anti-deformation support plate; the anti-deformation structure for 3D printing thin-walled parts and the component to be 3D printed are integrally formed by 3D printing.

2. The anti-deformation structure for 3D printing thin-walled parts according to claim 1, characterized in that: The end reserved portion is formed by extending the end of each thin-walled part to be 3D printed by 0.5 mm to 1 mm in its length direction.

3. The anti-deformation structure for 3D printing thin-walled parts according to claim 2, characterized in that: The spacing between adjacent thin-walled parts to be 3D printed is 0.02-1 mm.

4. The anti-deformation structure for 3D printing thin-walled parts according to claim 1, characterized in that: The thin-walled parts to be 3D printed in the components to be 3D printed are identical or approximately identical.

5. The anti-deformation structure for 3D printing thin-walled parts according to claim 1, characterized in that: A plurality of reinforcing ribs are arranged at intervals on the side of all the first anti-deformation support plates and the second anti-deformation support plates away from the component to be 3D printed.

6. The anti-deformation structure for 3D printing thin-walled parts according to claim 5, characterized in that: Several reinforcing ribs are evenly spaced, and the distance between adjacent reinforcing ribs is 20 to 150 mm.

7. The anti-deformation structure for 3D printing thin-walled parts according to claim 6, characterized in that: The length, height and thickness of the first anti-deformation support plate and the second anti-deformation support plate are equal to the length, height and thickness of the thin-walled part to be 3D printed.

8. The anti-deformation structure for 3D printing thin-walled parts according to claim 7, characterized in that: The height of the reinforcing rib is equal to the height of the first anti-deformation support plate and / or the second anti-deformation support plate.

9. The anti-deformation structure for 3D printing thin-walled parts according to claim 1, characterized in that: The thickness of the third anti-deformation support plate and the fourth anti-deformation support plate is 1-5 times the thickness of the thin-walled part to be 3D printed.

10. The anti-deformation structure for 3D printing thin-walled parts according to any one of claims 1 to 9, characterized in that: The materials of the first anti-deformation support plate, the second anti-deformation support plate, the third anti-deformation support plate and the fourth anti-deformation support plate are the same as the material of the thin-walled part to be 3D printed; and the first anti-deformation support plate and the second anti-deformation support plate have the same shape; the third anti-deformation support plate and the fourth anti-deformation support plate have the same shape.

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