A hollow printed part and its 3D printing support part

Abstract

This application discloses a hollow printed part, a 3D printing support member thereof, a method for constructing the 3D printing support member, and a 3D printing method for the hollow printed part. The hollow printed part has a 3D printing support member with at least one end connected to the hollow printed part; the support member includes a main body and a connecting portion connected to the hollow printed part; at least part of the connection between the connecting portion and the hollow printed part is located within the hollow printed part.

Description

[0001] Priority Declaration

[0002] This application claims priority to Chinese application No. 201821549720.3 filed on September 21, 2018. Technical Field

[0003] The present application relates to the field of 3D printing technology, and in particular to a hollow printed part and a 3D printing support part thereof, a method for constructing a 3D printing support part, and a 3D printing method for a hollow printed part. Background Art

[0004] The technical principle of 3D printing is to first layer the three-dimensional model, then obtain the contour information or image information of each layer, and use adhesive materials such as powdered metal or resin to complete the printing of the print by printing layer by layer.

[0005] Because 3D printing involves solidifying and stacking materials layer by layer, the upper layers of the model generally require support from the lower layers. Therefore, if certain parts of the printed part are suspended, support members are usually required to support these suspended parts. In existing technology, after printing is completed and the support members are separated from the printed part, the remaining support members on the surface of the printed part will affect the appearance and, more importantly, the normal use of the printed part. Summary of the Invention

[0006] One of the embodiments of the present application provides a 3D printing support member for a hollow printed part, wherein at least one end of the support member is connected to the hollow printed part; the support member includes a main body and a connecting portion connected to the hollow printed part; at least part of the connection between the connecting portion and the hollow printed part is located inside the hollow printed part.

[0007] In some embodiments, the connection between at least part of the connecting portion and the hollow printed part is located inside the hollow printed part, which includes: at least part of the connecting portion extends into a hole or cavity of the hollow printed part.

[0008] In some embodiments, a cross-sectional area of an end of the connecting portion connected to the hollow printed part is smaller than a cross-sectional area of the main body portion.

[0009] In some embodiments, the support member includes a columnar support member, a sheet support member and / or a mesh support member.

[0010] In some embodiments, the hollow printed part includes at least two sub-printed parts, the at least two sub-printed parts are identical, and the at least two sub-printed parts are arranged in rotational symmetry.

[0011] In some embodiments, after the assembly formed by the support member and at least part of the hollow printed member is divided into multiple layers of parallel slices, all slices between each layer of slices and the initial printed slice constitute sub-assemblies, and the line connecting the center of gravity of each sub-assembly is located in the first cylindrical space perpendicular to any slice.

[0012] In some embodiments, the hollow print comprises a hollow sole.

[0013] In some embodiments, the interior of the hollow sole is a mesh structure; at least part of the connecting portion is connected to the pillars of the mesh structure inside the hollow sole.

[0014] In some embodiments, at least a portion of the connection between the connecting portion and the hollow sole is located at the junction of two contour surfaces on the hollow sole.

[0015] Another embodiment of the present application provides a hollow printed part, which uses the 3D printing support member described in any of the above technical solutions during printing.

[0016] In some embodiments, the hollow printed part is a hollow sole.

[0017] Yet another embodiment of the present application provides a hollow printed part having connection traces after removing 3D printing support parts, and at least part of the connection traces is located inside the hollow printed part.

[0018] In some embodiments, at least part of the connection traces being located inside the hollow printed part includes: at least part of the connection traces being located in a hole or cavity of the hollow printed part.

[0019] Another embodiment of the present application provides a method for constructing a 3D printing support member for a hollow printed part, including: obtaining a hollow printed part model; constructing a support member for the hollow printed part model, at least one end of the support member being connected to the hollow printed part, the support member including a main body and a connecting portion connected to the hollow printed part, at least part of the connection between the connecting portion and the hollow printed part being located inside the hollow printed part.

[0020] Another embodiment of the present application provides a 3D printing method for a hollow printed part, which includes: constructing a support part for a hollow printed part model according to the 3D printing support part construction method for a hollow printed part described in any of the above technical solutions; and printing the hollow printed part and the support part using a 3D printing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0022] Figure 1 This is a schematic diagram of the connection between a 3D printing support member and a hollow printing member according to some embodiments of the present application;

[0023] Figure 2 is a side view of a 3D printing support member and a hollow printed member according to some embodiments of the present application;

[0024] Figure 3 is a bottom schematic diagram of a 3D printing support member and a hollow printed member according to some embodiments of the present application;

[0025] Figure 4 Schematic diagram of the structure of a sub-printed part and a supporting part of a hollowed-out printed part according to some embodiments of the present application;

[0026] Figure 5 This is an enlarged schematic diagram of the connection position between the 3D printing support member and the hollow printing member according to one embodiment of the present application;

[0027] Figure 6 This is a flow chart of a method for constructing a 3D printing support part for a hollow printed part according to some embodiments of the present application.

[0028] In the figure, 1 is a hollow printed part, 2 is a supporting part, 10 is a sub-printed part, 201 is a main body, and 202 is a connecting part. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0030] On the contrary, this application covers any alternatives, modifications, equivalents, and solutions made within the spirit and scope of this application as defined by the claims. Furthermore, to facilitate a better understanding of this application, certain specific details are described in detail below in the detailed description of this application. Those skilled in the art will be able to fully understand this application without these details.

[0031] The embodiments of the present application mainly relate to a 3D printing support for a hollow printed part, which can be applicable to a variety of scenarios for printing hollow printed parts. For example, the 3D printing support can be applied to technologies for 3D printing hollow printed parts such as photocuring, fused deposition modeling, and three-dimensional powder bonding. In some embodiments, the 3D printing support can be a support during the 3D printing design process, a support during the printing process, or a support after printing is completed. The present application also relates to a hollow printed part that uses a 3D printing support during printing, and the hollow printed part can be a hollow printed item used in various aspects such as medicine, industry, life, and art. The present application also relates to a method for constructing a 3D printing support for a hollow printed part and a 3D printing method. Those skilled in the art can use the 3D printing support construction method on software such as Rhino, Solidworks, Catia, or UG to realize the construction of a 3D printing support for a hollow printed part, and complete the printing through various 3D printing equipment. This application does not limit the application scenarios of the 3D printing support of the hollow printed part, the hollow printed part, the 3D printing support construction method of the hollow printed part, and the 3D printing method.

[0032] Figure 1 is a schematic diagram of the connection between the 3D printing support member and the hollow printing member according to some embodiments of the present application. Figure 2 is a side view of a 3D printing support member and a hollow printed member according to some embodiments of the present application. Figure 3 This is a bottom schematic diagram of a 3D printing support member and a hollow printed member according to some embodiments of the present application. Figure 1-3 The 3D printing support member of the hollow printed part involved in the embodiment of the present application is described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation of the present application.

[0033] In the embodiments of the present application, Figure 1As shown, at least one end of the 3D printing support member 2 is connected to the hollow printing member 1, and the support member 2 may include a main body 201 and a connecting portion 202 connected to the hollow printing member 1; at least part of the connection between the connecting portion 202 and the hollow printing member 1 is located inside the hollow printing member 1. In the embodiment of the present application, the hollow printing member can be understood as a 3D printing product with a hollow structure such as holes or cavities inside. The hollow printing member can be completely hollow, such as a printing member with a mesh structure; or it can be partially hollow, such as having a hollow structure only in a certain part of the printing member. It should be noted that at least one end of the 3D printing support member 2 is connected to the hollow printing member 1. One end of the support member 2 is connected to the 3D printing forming table, and the other end is connected to the hollow printing member 1; or both ends of the support member 2 are connected to the hollow printing member 1. It should also be noted that at least part of the connection between the connection portion 202 and the hollow printed part 1 is located inside the hollow printed part 1. It can be understood that all the connection between the connection portion 202 and the hollow printed part 1 is located inside the hollow printed part 1 (such as Figure 1 ); or, the connection between part of the connecting portion 202 and the hollow printed part 1 is located inside the hollow printed part 1, while the connection between the remaining part of the connecting portion 202 and the hollow printed part 1 is located on the surface of the hollow printed part. Specifically, the connection portion 202 being located inside the hollow printed part 1 can be understood as the connection portion 202 extending into the hole or cavity of the hollow printed part 1. In some embodiments, the specific structure of the support member 2 can be determined according to the shape of the hollow printed part 1. In some embodiments, the specific structural construction of the support member 2 can be automatically completed by a software algorithm (such as Grasshopper), or it can be combined with manual design and adjustment.

[0034] In some embodiments, the 3D printing support member 2 may include any combination of one or more types of support members, such as columnar support members, sheet support members, and mesh support members. Those skilled in the art may configure the support members as needed during actual operation, and this application does not limit this. In some embodiments, when the 3D printing support member 2 includes a sheet support member, the sheet support member may include a single plane or multiple non-parallel planes, or may include one or more curved surfaces. The thickness of the sheet support member may be selected to be 0.1-10 mm.

[0035] In some embodiments, the cross-sectional area of the connecting portion 202 can be equal to that of the main body 201. In some embodiments, the cross-sectional area of the end of the connecting portion 202 connected to the hollow printed member 1 is smaller than the cross-sectional area of the main body 201. Specifically, the connecting portion 202 is connected between the main body 201 and the hollow printed member 1. The main body 201 is used to support the hollow printed member 1. The main body 201 is not connected to the hollow printed member 1, while the connecting portion 202 connects the main body 201 and the hollow printed member 1. This change in cross-sectional area ensures that the support member 2 can be easily removed from the hollow printed member 1 after printing. If the main body 201 has different shapes, those skilled in the art can use various design methods to ensure that the cross-sectional area of the end of the connecting portion 202 connected to the hollow printed member 1 is smaller than the cross-sectional area of the main body 201. For example, if the support member 2 comprises a columnar support member, the main body 201 may include one or more support columns, and the connecting portion 202 may include connecting columns respectively connecting the one or more support columns to the hollow printed member 1. The cross-sectional area of the connecting post can be set to be smaller than the cross-sectional area of the supporting post. Alternatively, the connecting post can be shaped like a pyramid, cone, or truncated cone, and the end of the connecting post with a smaller cross-sectional area in the pyramid, cone, or truncated cone shape is connected to the hollow printed part 1, while the end with a larger cross-sectional area is connected to the supporting post. When the support member 2 comprises a mesh support member, the main body 201 can include multiple pillars forming a mesh, and the connecting portion 202 can include connecting posts connected between the pillars and the hollow printed part 1. The cross-sectional area of the connecting post can be set to be smaller than the cross-sectional area of the supporting post. Alternatively, the connecting post can be shaped like a pyramid, cone, or truncated cone, and the end of the connecting post with a smaller cross-sectional area in the pyramid, cone, or truncated cone shape is connected to the hollow printed part 1, while the end with a larger cross-sectional area is connected to the supporting post. When the support member 2 comprises a sheet support 2, the main body 201 can include a support sheet, and the connecting portion 202 can include a serrated structure connected between the support sheet and the hollow printed part 1 or multiple spaced connecting posts. The end of the serrated connecting portion 202 with a smaller cross-sectional area is connected to the hollow printed member 1, while the end with a larger cross-sectional area is connected to the support sheet. In some alternative embodiments, the connecting portion 202 connecting the sheet-like support member to the hollow printed member 1 may include a connecting post in a pyramidal, conical, or truncated cone shape, with the end of the pyramidal, conical, or truncated cone-shaped connecting post with a smaller cross-sectional area connected to the hollow printed member 1 and the end with a larger cross-sectional area connected to the support sheet.

[0036] Figure 4 This is a schematic diagram of the structure of the sub-printed part and the supporting part of the hollowed-out printed part shown in some embodiments of the present application. Figure 4In the illustrated embodiment, the hollowed-out printed part 1 may include at least two sub-printed parts 10. The 3D printing support member 2 of any of the above-described schemes may be connected between two adjacent sub-printed parts 10. In this case, the support member 2 may or may not be connected to the 3D printing forming table. During the 3D printing process, at least two sub-printed parts 10 are printed simultaneously. The support member 2 can support and connect each sub-printed part 10, and each sub-printed part 10 can remain relatively stable. In particular, for sub-printed parts 10 that are difficult to place stably on their own, each sub-printed part 10 can support each other through the support member 2, reducing shaking during the printing process. In some preferred embodiments, at least two sub-printed parts 10 are identical, and at least two sub-printed parts 10 can be arranged in rotational symmetry. For example, the two sub-printed parts 10 can be arranged in 180° rotational symmetry. For another example, the three sub-printed parts 10 can be arranged in 120° rotational symmetry. This arrangement can firstly improve the production efficiency of the sub-printed parts 10. In addition, in each slice layer, the hollowed-out printed part 1 is a symmetrical structure, which facilitates the design of the structure of the support member 2. For example, the support member can be designed so that the center of gravity of each slice layer is located at the rotation center. For example, the support member in each slice layer can also be rotationally symmetric about the rotation center of the slice layer. In some alternative embodiments, the sub-printed parts 10 can also include other arrangements (such as an axisymmetric arrangement).

[0037] In some embodiments, after the assembly formed by the support member 2 and at least a portion of the hollowed-out printed part 1 is divided into multiple layers of parallel slices, all slices between each layer of slices and the initial printed slice constitute sub-assemblies, and the line connecting the center of gravity of each sub-assembly is located within the first cylindrical space perpendicular to any slice. In the embodiments of the present application, the first cylinder being perpendicular to any slice can be understood as the central axis of the first cylinder being perpendicular to any slice. In some embodiments, the first cylinder can include but is not limited to a cylinder, a triangular prism, a square prism, a hexagonal prism, etc. In some embodiments, the size of the first cylinder can be set according to the specific circumstances (such as the size of the printed part). For example, when the first cylinder is a cylinder, the diameter of the first cylinder can be set to 0.1 to 50 mm (such as 0.1 mm, 0.5 mm, 1 mm, 5 mm, 10 mm, etc.). In some embodiments, the line connecting the center of gravity of each sub-assembly is located within the first cylindrical space, which can be understood as the line connecting the center of gravity of each sub-assembly being perpendicular or approximately perpendicular to any slice. In some embodiments, the assembly can be formed by the support member 2 and the printed part 1 as a whole. In some embodiments, the assembly can also be formed by the support member 2 and a portion of the printed part 1. For example, the partial print may be a portion of the print that includes the support member in the slices after being divided into slices. In some embodiments, the initial print slice may be understood as the first layer of slices printed when the print 1 is printed.

[0038] In some embodiments, the operation of ensuring that the line connecting the center of gravity of each subassembly is located within the first cylindrical space perpendicular to any slice can be embedded in the support component construction software in the form of a program, so that it can be called or adopted by default when the support component is constructed using the software. In addition, dividing the assembly into multiple layers of parallel slices can be reflected during the modeling process, the printing process and / or after the printing is completed. It should also be noted that the multiple layers of slices into which the assembly is divided are generally parallel to the forming table of 3D printing, so as to facilitate the smooth progress of the 3D printing process. In some embodiments, in order to further prevent the printed part from shaking during the 3D printing process, the line connecting the center of gravity of each subassembly can be made perpendicular to any slice. By setting the support 2 in the above manner, the hollow printed part 1 can be effectively prevented from shaking during the 3D printing process of the hollow printed part 1, and the printing deviation can be reduced. For example, for bottom-up light-curing 3D printing technology, since light curing starts from the bottom of the resin tank, each time a layer of curing is completed, the forming table carries the cured print piece and moves up to the height of a layer. The entire printing process requires the forming table to move upward continuously. The print piece attached to the forming table will be affected by gravity and uncured liquid (such as photosensitive resin, etc.). The process of the forming table moving upward after each layer of printing is completed may cause the hollow print piece 1 to shake, and even cause printing deviation. When the material for light-curing 3D printing is an elastomeric material, the shaking problem of the hollow print piece 1 caused by the upward movement of the forming table will be particularly prominent. Elastomeric materials generally have a low Young's modulus and a high failure strain. They undergo large deformation when subjected to force, and can quickly return to their approximate original shape and size after the external force is removed. Elastomeric materials can include but are not limited to rubber, thermoplastic polyurethane, etc. The hollow print piece 1 and support member 2 involved in the embodiments of the present application can be printed from an elastomeric material.

[0039] In some embodiments, as Figure 1-4 As shown, the hollow printed part 1 can be a hollow sole. By using a hollow sole, the air permeability of shoes (especially sports shoes) can be improved. At least part of the connection between the connecting portion 202 and the hollow sole is located inside the hollow sole, which can mean that the connection is located within the hollow hole of the hollow sole. Through the above arrangement, when the support member 2 is removed from the hollow sole, the residual material of the support member 2 will not remain outside the hollow sole, which not only ensures the integrity of the appearance of the hollow sole, but also improves the comfort of the shoes using the hollow sole.

[0040] In some embodiments, the interior of the hollow sole is a mesh structure, and at least part of the connecting portion 202 of the support member 2 is connected to the pillars of the mesh structure inside the hollow sole. The mesh structure inside the hollow sole not only makes the sole lighter, but also reduces the material used in the hollow sole. When the interior of the hollow sole is configured as a mesh structure, the pillars of the mesh structure provide an ideal attachment location for the connecting portion 202 of the support member 2, making it easier to separate the support member 2 from the hollow sole. In some embodiments, the hollow sole can be printed using an elastomeric material (such as rubber, thermoplastic polyurethane, etc.).

[0041] Figure 5 This is an enlarged schematic diagram of the connection position between the 3D printing support and the hollow printing part according to one embodiment of the present application. Figure 5 In the illustrated embodiment, the hollow printed part is a hollow sole, and the connection between the connecting portion 202 of at least part of the support member 2 and the hollow sole is located at the intersection of two contour surfaces on the hollow sole. In some cases, the connecting portion 202 of the support member 2 needs to be arranged outside the hollow sole to support the hollow sole. In this case, by locating the connecting portion at the intersection of the two contour surfaces, it is easier to separate the support member 2 from the hollow sole, while not leaving residual material of the support member 2 on the contour surface of the hollow printed part 1, thereby minimizing the impact of the residual material of the support member 2 on the appearance of the hollow printed part 1. For example, for a hollow sole, the intersection of the two contour surfaces can be understood as the intersection of the top surface and the side surface of the sole, or the intersection of the bottom surface and the side surface of the sole. When the hollow printed part 1 includes other printed parts, the connection between the connecting portion 202 and the printed part can also be arranged at the intersection of the two contour surfaces of the printed part.

[0042] The beneficial effects that may be brought about by the 3D printing support member of the hollow printed part disclosed in this application include but are not limited to: (1) after separation from the hollow printed part, the residual material of the support member will not remain on the outer surface of the hollow printed part, thereby not affecting the appearance and use function of the hollow printed part 1; (2) after printing is completed, the support member is easy to separate from the hollow printed part; (3) it can prevent the hollow printed part from shaking during the 3D printing process, thereby reducing printing deviation and improving printing accuracy. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced may be any one or a combination of the above, or any other possible beneficial effects.

[0043] Another embodiment of the present application provides a hollow printed part. A hollow printed part 1 employs a 3D printing support member 2 according to any of the aforementioned technical solutions during printing. By utilizing the support member 2 according to any of the aforementioned technical solutions, the hollow printed part 1 retains most of the residual material of the support member 2 after separation from the hollow printed part 1. The residual material does not remain on the outer surface of the hollow printed part 1, thereby not affecting the appearance and functionality of the hollow printed part 1.

[0044] In some embodiments, the hollow printed part 1 may be a hollow shoe sole. In other embodiments, the hollow printed part 1 may be a handicraft with a hollow pattern, or an industrial part or medical prosthesis with a hollow structure.

[0045] Another embodiment of the present application provides a hollow printed part. The hollow printed part 1 has a connection trace after removing the 3D printing support member, and at least a portion of the connection trace is located inside the hollow printed part 1. Specifically, at least a portion of the connection trace can be located within a hole or cavity of the hollow printed part 1. Because the connection trace is located inside the hollow printed part 1, it does not affect the appearance of the hollow printed part 1.

[0046] Another embodiment of the present application provides a method for constructing a 3D printing support member for a hollow printed part. Figure 6 This is a flow chart of a method for constructing a 3D printing support member for a hollow printed part according to some embodiments of the present application. Figure 6 As shown, the method for constructing a 3D printed support member 2 may include: obtaining a model of a hollow printed part 1; constructing a support member 2 for the hollow printed part 1 model, wherein at least one end of the support member 2 is connected to the hollow printed part 1, and the support member 2 includes a main body 201 and a connecting portion 202 connected to the hollow printed part 1, with at least part of the connection between the connecting portion 202 and the hollow printed part 1 located within the hollow printed part 1. It should be noted that the connection between at least one end of the support member 2 and the hollow printed part 1 may be such that one end of the support member 2 is connected to the 3D printing forming table and the other end is connected to the hollow printed part 1, or both ends of the support member 2 are connected to the hollow printed part 1. The model construction of the hollow printed part 1 can be implemented using software such as Rhino, Solidworks, Catia, or UG. The construction of the support member 2 can be determined based on the shape of the hollow printed part 1. The specific structural construction of the support member 2 can be automatically completed using software algorithms (such as Grasshopper) or manually designed and adjusted.

[0047] In some embodiments, the cross-sectional area of the end of the connecting portion 202 connected to the hollow printed part 1 is smaller than the cross-sectional area of the main body 201. Specifically, the connecting portion 202 is connected between the main body 201 and the hollow printed part 1. The main body 201 is used to support the hollow printed part 1, while the connecting portion 202 connects the main body 201 and the hollow printed part 1. This change in cross-sectional area ensures that the entire support member 2 can be easily removed from the hollow printed part 1 after printing. In some embodiments, the support member 2 can include any combination of one or more types of support members, such as columnar support members, sheet support members, and mesh support members.

[0048] In some embodiments, the hollowed-out printed part may include at least two sub-printed parts. The at least two sub-printed parts 10 may be identical, and the at least two sub-printed parts 10 may be arranged in rotational symmetry. Through such an arrangement, the production efficiency of the sub-printed parts 10 can be improved. In addition, in each layer of slices, the printed part 1 is a symmetrical structure (such as central symmetry), which facilitates the design of the structure of the support member 2. For example, by designing the support member, the center of gravity of each layer of slices is located at the center of rotation. For example, the support member in each layer of slices may also be rotationally symmetric about the rotation center of the layer of slices.

[0049] In some embodiments, after the assembly formed by the support member 2 and at least a portion of the hollowed-out printed part 1 is divided into multiple layers of parallel slices, all slices between each layer of slices and the initial printed slice constitute sub-assemblies, and the line connecting the center of gravity of each sub-assembly is located within a first cylindrical space perpendicular to any slice. The process of constructing a support member 2 for a hollowed-out printed part 1 model may include: constructing a support member 2 for the printed part 1, with at least one end connected to the printed part 1; dividing the assembly of the support member 2 and the printed part 1 into multiple layers of parallel slices parallel to the 3D printing forming table according to a certain layer thickness (such as 0.1mm, 0.15mm or 0.2mm, etc.); calculating the center of gravity position of each sub-assembly, and adjusting the structural shape of the support member 2 according to the center of gravity position so that the line connecting the center of gravity of each sub-assembly is located within the first cylindrical space perpendicular to any slice. The support member 2 of the hollow printed part 1 can be constructed in the above manner. The support member 2 can not only prevent the hollow printed part 1 from shaking during the 3D printing process of the hollow printed part 1, but also reduce the residual material of the support member 2 left on the surface of the hollow printed part 1 after the hollow printed part is separated from the support member.

[0050] In some embodiments, the hollow printed part 1 may include a hollow sole. When the support member 2 is removed from the hollow sole, the residual material of the support member 2 located at the connection point inside the hollow sole will not remain outside the hollow sole, thereby ensuring the integrity of the appearance of the hollow sole and the comfort of the shoes using the hollow sole.

[0051] The beneficial effects that may be brought about by the method for constructing a 3D printing support member for a hollow printed part disclosed in this application include but are not limited to: (1) after the constructed support member is separated from the hollow printed part, the residual material of the support member will not remain on the outer surface of the hollow printed part, thereby not affecting the appearance and use function of the hollow printed part; (2) the constructed support member is easy to separate from the hollow printed part after printing is completed; (3) the constructed support member can prevent the hollow printed part from shaking as much as possible during the 3D printing process to reduce printing deviation. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced may be any one or a combination of the above, or any other possible beneficial effects.

[0052] Yet another embodiment of the present application provides a 3D printing method, comprising: constructing a support member 2 for a hollow printed part 1 model according to the 3D printing support member construction method of any of the above-mentioned technical solutions; and printing the hollow printed part 1 and the support member 2 using a 3D printing device. The 3D printing device for printing the hollow printed part 1 and the support member 2 may be a photocuring 3D printer, a fused deposition modeling 3D printer, or a powder bonding 3D printer. This 3D printing method uses the above-mentioned 3D printing support member construction method for the hollow printed part to perform preliminary modeling for the support member 2, thereby constructing the support member 2. The printed support member 2 and the hollow printed part 1 are easily separable, and the material of the support member 2 can be effectively reduced to remain on the outer surface of the hollow printed part 1.

[0053] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A 3D printing support for a hollow printed part, characterized in that: At least one end of the support member is connected to the hollow printed member; The support member includes a main body and a connecting portion connected to the hollow printed member; the main body is used to support the hollow printed member, the connecting portion is connected between the main body and the hollow printed member, and the cross-sectional area of the end of the connecting portion connected to the hollow printed member is smaller than the cross-sectional area of the main body; At least part of the connection between the connecting portion and the hollow printed part is located inside the hollow printed part, including: at least part of the connecting portion extends into the hole or cavity of the hollow printed part; wherein, After the assembly formed by the support member and at least part of the hollow printed member is divided into multiple layers of parallel slices, all slices between each layer of slices and the initial printed slice constitute sub-assemblies, and the line connecting the center of gravity of each sub-assembly is located in the first cylindrical space perpendicular to any slice, so that the line connecting the center of gravity of each sub-assembly is perpendicular to the arbitrary slice.

2. The 3D printing support member according to claim 1, wherein: The support member includes a columnar support member, a sheet support member and / or a mesh support member.

3. The 3D printing support member according to claim 1, wherein: The hollow printed part includes at least two sub-printed parts, the at least two sub-printed parts are identical, and the at least two sub-printed parts are arranged in rotational symmetry.

4. The 3D printing support according to any one of claims 1 to 3, wherein: The hollow printed part includes a hollow sole.

5. The 3D printing support member according to claim 4, wherein: The interior of the hollow sole is a mesh structure; At least part of the connecting portion is connected to the support pillars of the inner mesh structure of the hollow sole.

6. The 3D printing support member according to claim 5, characterized in that: At least a portion of the connection portion and the hollow sole is connected at a junction of two contour surfaces on the hollow sole.

7. A hollow printed part, characterized in that: The hollow printed part adopts the 3D printing support part according to any one of claims 1 to 6 during printing.

8. The hollow printed part according to claim 7, wherein: The hollow printed part is a hollow sole.

9. A method for constructing a 3D printing support member for a hollow printed part, characterized in that: include: Get the hollow print model; A support member is constructed for the hollow printed part model, wherein at least one end of the support member is connected to the hollow printed part, and the support member includes a main body and a connecting portion connected to the hollow printed part; the main body is used to support the hollow printed part, and the connecting portion is connected between the main body and the hollow printed part, and the cross-sectional area of the end of the connecting portion connected to the hollow printed part is smaller than the cross-sectional area of the main body; At least part of the connection between the connecting portion and the hollow printed part is located inside the hollow printed part, including: at least part of the connecting portion extends into the hole or cavity of the hollow printed part; wherein, After the assembly formed by the support member and at least part of the hollow printed member is divided into multiple layers of parallel slices, all slices between each layer of slices and the initial printed slice constitute sub-assemblies, and the line connecting the center of gravity of each sub-assembly is located in the first cylindrical space perpendicular to any slice, so that the line connecting the center of gravity of each sub-assembly is perpendicular to the arbitrary slice.

10. The method for constructing a 3D printing support member according to claim 9, wherein: The support member includes a columnar support member, a sheet support member and / or a mesh support member.

11. The method for constructing a 3D printing support member according to claim 9, wherein: The hollow printed part includes at least two sub-printed parts, the at least two sub-printed parts are identical, and the at least two sub-printed parts are arranged in rotational symmetry.

12. The method for constructing a 3D printing support member according to any one of claims 9 to 11, wherein: The hollow printed part includes a hollow sole.

13. A 3D printing method for a hollow printed part, characterized in that: include: Constructing a support for a hollow printed part model according to the method for constructing a 3D printing support for a hollow printed part according to any one of claims 9 to 12; The hollow printed part and the support part are printed using a 3D printing device.

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