Variable cross-section hollow support structure based on deposition molding of additively manufactured lattice structures

Abstract

The present application relates to the technical fields of additive manufacturing, and proposes a hollow support structure with variable cross-section and hollow structure based on additive manufacturing of deposition molding, which comprises a support piece, the support piece comprises a support body and a plurality of transition fillings, the support body is integrally formed in the hollow hole, the shape and size of the cross section of the support body, the cross section of the intermediate groove and the cross section of the hollow hole are the same; the transition filling is integrally formed at the edge in the intermediate groove. The present application sets the support piece and the transition filling, uses them together with the structural piece for additive manufacturing, makes the horizontal cross section and the vertical cross section of the support piece and the structural piece into a line, and there is no isolated point, which not only satisfies the support effect of the position of the hollow hole side wall of the structural piece in the manufacturing process, but also makes the removal of the support piece after additive manufacturing easier, guarantees the mechanical properties of the position of the hollow hole side wall of the structural piece, improves the material utilization, and improves the manufacturing efficiency of the structural piece.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to a variable cross-section hollow support structure based on deposition modeling additive manufacturing. Background Technology

[0002] Additive manufacturing is a technology that uses mathematical models as a basis and employs powdered metals or plastics and other bondable materials to construct objects by printing them layer by layer. It has applications in fields such as industrial design, architecture, automotive, aerospace and civil engineering.

[0003] Many additively manufactured structural components have perforations. For example, the additively manufactured reinforcement structure disclosed in the invention patent with patent publication number CN108224071B has a closed perimeter around the perforation. When additively manufacturing such structural components, the perforation positions on the structural components are usually not supported or protected, but the structural components are directly additively manufactured.

[0004] However, for large or super-large structural components, it is difficult for the perforated sidewalls produced by direct additive manufacturing to meet the requirements of mechanical load balance and structural rigidity. Subsequent trimming or splicing operations are required, resulting in relatively low processing efficiency for such structural components with closed perforations on all sides. Summary of the Invention

[0005] In view of this, the present invention proposes a variable cross-section hollow support structure based on deposition molding additive manufacturing, which can be additively manufactured together with the structural component, thereby improving the processing efficiency of the structural component while ensuring the mechanical properties of the hollow sidewall position on the structural component.

[0006] The technical solution of this invention is implemented as follows: This invention provides a variable cross-section hollow support structure based on deposition modeling additive manufacturing, used in additive manufacturing of structural components with internal perforations, where the structure is additively manufactured together with the structural component. The support includes a support body and multiple transition fillers.

[0007] The support body is integrally formed in the hollow hole, and its two sides are flush with the two sides of the structural component. The support body has a central groove inside, and the cross-section of the support body, the cross-section of the central groove and the cross-section of the hollow hole have the same shape and size.

[0008] The transition filler is integrally molded at the edge of the intermediate groove and integrally molded with the support body and the structural component.

[0009] Based on the above technical solutions, preferably, side grooves are provided on both sides of the support body, the cross-section of the side grooves has the same shape and size as the cross-section of the perforation, and the edges of the side grooves are also integrally formed with transition filling.

[0010] More preferably, the opening depth of the side groove is half the length of the middle groove along the opening direction of the side groove, and the center point of the middle groove coincides with the center point of the perforation.

[0011] More preferably, the transition filler is integrally formed at the edges of both sides of the support body located within the intermediate groove.

[0012] More preferably, the transition filler is a rod-shaped structure with a uniform cross-section, and the cross-sections of the plurality of transition fillers are the same.

[0013] More preferably, the length of the transition fill in the side groove opening direction gradually decreases from the side closer to the structural member to the side farther away from the structural member.

[0014] More preferably, the transition filler on the side away from the support body is an arc-shaped structure with the middle recessed towards the support body.

[0015] More preferably, the length of the transition fill along the side groove opening direction on the side close to the structural member is the same as the opening depth of the side groove.

[0016] Based on the above technical solutions, preferably, it also includes a reinforcing beam, which is integrally formed in the intermediate groove and integrally formed with the upper and lower sides of the hollow hole.

[0017] More preferably, the cross-section of the reinforcing beam is zigzag-shaped.

[0018] The variable cross-section hollow support structure based on deposition modeling additive manufacturing of the present invention has the following advantages over the prior art:

[0019] (1) By setting up support components and transition fillers, and using them together with structural components for additive manufacturing, the horizontal and vertical cross sections of the support components and structural components are aligned, and there are no isolated points. This satisfies the support function for the hollow sidewalls of the structural components during the manufacturing process, and makes it easier to remove the support components after additive manufacturing. This not only ensures the mechanical properties of the hollow sidewalls of the structural components and improves the material utilization rate, but also improves the manufacturing efficiency of the structural components.

[0020] (2) By setting side grooves and middle grooves and using transition filling to cooperate with them, not only can the use of additive materials be reduced and the processing cost of additive manufacturing of structural parts be reduced, but also the additive materials can achieve a good transition at the transition filling position, avoiding the problem of material collapse during additive manufacturing.

[0021] (3) By restricting the shape and position of the side groove, the middle groove and the transition fill, and with the reinforcing beam set in the middle groove, the support strength and support uniformity of the support component to the perforated side wall position can be improved, thus ensuring the processing quality of the structural component. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the variable cross-section hollow support structure and structural components based on deposition molding additive manufacturing of the present invention.

[0024] Figure 2 This is a perspective view of the variable cross-section hollow support structure based on deposition modeling additive manufacturing of the present invention.

[0025] Figure 3 This is a front view of the variable cross-section hollow support structure based on deposition modeling additive manufacturing of the present invention.

[0026] Figure 4 for Figure 3 Enlarged view of section AA;

[0027] Figure 5 for Figure 3 Enlarged view of section BB;

[0028] Figure 6 This is a perspective view of a structural component in the variable cross-section hollow support structure based on deposition molding additive manufacturing of the present invention.

[0029] Figure 7 This is a perspective view of state S1 in the additive manufacturing method of the structural component in the hollow support structure with a hollow structure based on deposition molding additive manufacturing of the present invention.

[0030] Figure 8 This is a perspective view of state S2 in the additive manufacturing method of the structural component in the hollow support structure with a hollow structure based on deposition molding additive manufacturing of the present invention.

[0031] Figure 9 This is a perspective view of state S3 in the additive manufacturing method of the structural component in the hollow support structure with a hollow structure based on deposition molding additive manufacturing of the present invention.

[0032] Figure 10 This is a perspective view of state S4 in the additive manufacturing method of the structural component in the hollow support structure with a hollow structure based on deposition molding additive manufacturing of the present invention.

[0033] Figure 11 This is a perspective view of state S5 in the additive manufacturing method of the structural component in the hollow support structure with a hollow structure based on deposition molding additive manufacturing of the present invention.

[0034] Figure 12 for Figure 3 A magnified view of the CC area.

[0035] Among them: 1. Support component; 11. Support body; 12. Transition filler; 101. Intermediate groove; 102. Side groove; 2. Reinforcing beam; 3. Structural component; 301. Hole. Detailed Implementation

[0036] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] like Figure 1-12 As shown, the variable cross-section hollow support structure based on deposition molding additive manufacturing of the present invention is used to perform additive manufacturing together with the structural component 3 when the structural component 3 with the hollowed-out structure 301 is opened inside the additive manufacturing process. It includes a support component 1 and a reinforcing beam 2.

[0038] The support member 1 is used to support the sidewalls inside the perforation 301. The support member 1 includes a support body 11 and multiple transition fillers 12. The support body 11 is integrally formed inside the perforation 301, and the two sides of the support body 11 are flush with the two sides of the structural member 3. A central groove 101 is formed inside the support body 11. The cross-sections of the support body 11, the central groove 101, and the perforation 301 have the same shape and size. That is, the central groove 101 divides the support body 11 into two spaced plate-like structures. The transition fillers 12 are integrally formed at the edges inside the central groove 101 and are integrally formed with the support body 11 and the structural member 3. When additive manufacturing is performed on the support component 1 and the structural component 3 simultaneously, the support of the side of the support body 11 and the side of the transition filler 12 on the side wall of the perforation 301 can improve the mechanical load balance and structural rigidity of the structural component 3 at the position of the side wall of the perforation 301, and ensure the processing quality of the structural component 3. After the additive manufacturing is completed, the processing of the structural component 3 can be completed simply by removing the support component 1 from the structural component 3, without the need to trim the side wall of the perforation 3, which also speeds up the processing efficiency of the structural component 3. At the same time, by setting the intermediate groove 101, the amount of additive material used to process the support component 1 can be reduced, and the processing cost of the structural component 3 can also be reduced.

[0039] To further reduce the processing cost of structural component 3, side grooves 102 can be opened on both sides of the support body 11, so that the cross-section of the side groove 102 is the same as the cross-section of the hole 301, and the edge of the side groove 102 is also integrally formed with transition filler 12, thereby reducing the amount of additive material used to process the support component 1.

[0040] In a preferred embodiment, the opening depth of the side groove 102 is preferably set to half the length of the middle groove 101 along the opening direction of the side groove 102, and the center point of the middle groove 101 coincides with the center point of the perforation 301, so that the support body 11 is symmetrically arranged in the perforation 301; similarly, the edges of the support body 11 on both sides of the middle groove 101 should be integrally formed with transition filler 12, so as to achieve symmetrical arrangement of transition filler 12 and ensure the symmetry and uniformity of support for the side wall of perforation 301.

[0041] Regarding the shape of the transition filler 12, in order to ensure that the multiple transition fillers 12 exert a uniform supporting force on the sidewall of the perforation 301, it is preferable to set the transition filler 12 as a rod-shaped structure with a uniform cross-section, and to make the cross-sections of the multiple transition fillers 12 the same; and in order to ensure that the transition fillers 12 can transition uniformly during the additive manufacturing process and avoid the collapse of the additive material, it is preferable to make the length of the transition filler 12 in the opening direction of the side groove 102 gradually decrease from the side closer to the structural member 3 to the side farther away from the structural member 3, specifically, as follows: Figure 4As shown, the side of the transition filler 12 away from the support body 11 is an arc-shaped structure with the middle recessed towards the support body 11. This shape of the transition filler 12 can also save additive materials.

[0042] To ensure that the transition filler 12 can support the entire side of the cutout 301, improving its overall support and uniformity, the length of the transition filler 12 along the opening direction of the side groove 102 on the side closest to the structural member 3 should be the same as the opening depth of the side groove 102. Figure 4 and Figure 5 As shown, the cross-sectional shape of the support member 1 is the same in all directions, and the shape and size of the transition filler 12 are also consistent. That is, when the angle between the side wall of the perforation 301 and the ground is different, the support member 1 can apply the same and uniform support force to each side wall of the perforation 301, ensuring the consistency of the mechanical properties of each side wall of the perforation 301.

[0043] The reinforcing beam 2 is used to support the structural component 3 in conjunction with the support component 1. The reinforcing beam 2 is integrally formed in the intermediate groove 101 and integrally formed with the upper and lower sides of the hollow 301. It is mainly used to support the top wall of the hollow 301 to prevent the additive material in this position from collapsing. Specifically, it is preferable to set the cross-section of the reinforcing beam 2 as zigzag to improve its structural strength.

[0044] like Figure 4 , Figure 5 and Figure 12 As shown, the horizontal and vertical sections of support component 1 and structural component 3 are aligned, with no isolated points. This satisfies the support function for the perforated sidewalls of the structural component during manufacturing and makes the removal of the support component easier after additive manufacturing. This not only ensures the mechanical properties of the perforated sidewalls of the structural component and improves material utilization, but also enhances the manufacturing efficiency of the structural component. For this type of perforated structure, traditional additive manufacturing methods can only employ a "straight wall" approach, which weakens the freedom of additive manufacturing and increases the manufacturing time and material consumption of deposition forming. Based on the support stress state of deposition forming and the characteristics of additive manufacturing, this invention uses a linear transition three-dimensional slice with a gradually changing interface. Specifically, the horizontal slice's top view is a line without breaks, and the vertical direction shows a gradually narrowing structure. This design optimizes the support structure, overturning the traditional support design model. While ensuring the support function, it reduces the amount of additive manufacturing material used and the manufacturing cycle, effectively reducing manufacturing costs and improving efficiency.

[0045] The additive manufacturing method of structural component 3 in the hollow support structure with variable cross-section based on deposition molding additive manufacturing of the present invention is as follows:

[0046] S1, as Figure 7As shown, the portion of structural component 3 located at the bottom of the cutout 301 is processed using additive manufacturing.

[0047] S2, as Figure 8 As shown, the transition filler 12, the support body 11, and the reinforcing beam 2 at the lower position inside the cutout 301 are processed by additive manufacturing.

[0048] S3, as Figure 9 As shown, additive manufacturing is used to process the support body 11 and reinforcing beam 2 in the middle position of the cutout 301, as well as the transition filler 12 on the left and right sides.

[0049] S4, such as Figure 10 As shown, the transition filler 12, the support body 11, and the reinforcing beam 2 at the upper position inside the cutout 301 are processed by additive manufacturing.

[0050] S5, such as Figure 11 As shown, the portion of structural component 3 located at the bottom of the cutout 301 is processed using additive manufacturing until it reaches the desired consistency. Figure 1 As shown, the processing of the structural component 3, support component 1, and reinforcing beam 2 as a whole component is completed;

[0051] S6, such as Figure 6 As shown, the structural component 3 can be processed by removing the support member 1 and the reinforcing beam 2 from the hole 301.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A variable cross-section hollow support structure based on deposition modeling additive manufacturing, used in additive manufacturing of a structural component (3) with a perforated (301) structure inside, wherein the structural component (3) is additively manufactured together with the structural component (3), characterized in that: Includes a support member (1), which comprises a support body (11) and a plurality of transition fillers (12), wherein, The support body (11) is integrally formed in the perforation (301), and its two sides are flush with the two sides of the structural component (3). The support body (11) has an intermediate groove (101) inside. The cross-section of the support body (11), the cross-section of the intermediate groove (101) and the cross-section of the perforation (301) have the same shape and size. The transition filler (12) is integrally formed at the edge of the intermediate groove (101) and integrally formed with the support body (11) and the structural member (3); The support body (11) has side grooves (102) on both sides. The cross-section of the side groove (102) is the same as the cross-section of the hole (301) in shape and size. The edge of the side groove (102) is also integrally formed with transition filler (12). The opening depth of the side groove (102) is half the length of the middle groove (101) along the opening direction of the side groove (102), and the center point of the middle groove (101) coincides with the center point of the perforation (301). The transition filler (12) is integrally formed on both sides of the support body (11) located in the middle groove (101). The transition filler (12) is a rod-shaped structure with a uniform cross section, and the cross sections of multiple transition fillers (12) are the same; The length of the transition filler (12) in the opening direction of the side groove (102) gradually decreases from the side closer to the structural member (3) to the side farther away from the structural member (3); The length of the transition filler (12) on the side near the structural member (3) along the opening direction of the side groove (102) is the same as the opening depth of the side groove (102).

2. The variable cross-section hollow support structure based on deposition modeling additive manufacturing as described in claim 1, characterized in that: The transition filler (12) on the side away from the support body (11) is an arc-shaped structure with the middle recessed towards the support body (11).

3. The variable cross-section hollow support structure based on deposition modeling additive manufacturing as described in claim 1, characterized in that: It also includes a reinforcing beam (2), which is integrally formed in the intermediate groove (101) and integrally formed with the upper and lower sides in the perforation (301).

4. The variable cross-section hollow support structure based on deposition modeling additive manufacturing as described in claim 3, characterized in that: The cross-section of the reinforcing beam (2) is zigzag-shaped.

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