Dummy structure for flat type strain reduction and 3-dimension printing metal flat member having the same

Abstract

The present invention relates to a deformation-reducing dummy structure comprising a combination of a dummy structure for improving the deformation of the base material by alleviating residual stress concentration that occurs when an opening is present when creating a flat-shaped structure by 3D printing, and a lattice structure for easy separation from the base material, and a 3D-printed metal flat-plate member adopting the same. The present invention provides a 3D-printed metal flat-plate member in which, when creating a flat-shaped metal flat-plate member by 3D printing, a dummy structural plate formed in the same shape as the opening is coupled to the opening formed in the metal flat-plate member to cover the opening, thereby employing a deformation-reducing dummy structure.

Description

Technology Field

[0001] The present invention relates to a flat dummy structure for reducing deformation and a 3D-printed metal flat plate member employing the same. More specifically, the invention relates to an improved flat dummy structure for reducing deformation and a 3D-printed metal flat plate member employing the same, wherein a metal plate-shaped dummy structure plate capable of covering a hole when making a flat structure by 3D printing is designed to alleviate the concentration of residual stress during 3D printing stacking. Background Technology

[0002] A 3D printer is an additive manufacturing device that produces three-dimensional shapes by stacking materials layer by layer, rather than by cutting or shaping materials to create a three-dimensional shape.

[0003] And 3D printing is a technology that produces three-dimensional shapes through a layer-by-layer deposition process.

[0004] Recently, the application of this technology has expanded beyond prototypes and is being utilized in the production of products for various uses.

[0005] Currently, there are various 3D printing methods available, and among the metal 3D printing methods used industrially, the Powder Bed Fusion (PBF) method is a method that can create precise three-dimensional structures.

[0006] Furthermore, the Direct Energy Deposition (DED) method is repairable and allows for the production of large-sized products.

[0007] In addition, metal 3D printing technology is mainly used for the production of three-dimensional machine parts, but it is also used in various fields such as medicine.

[0008] However, the 3D printing methods mentioned above often caused non-uniformity of the thermal gradient by partially irradiating the laser only to specific parts, resulting in residual stress in the additive product after the process.

[0009] In particular, when creating flat structures using 3D printing, localized residual stress concentration frequently occurs when there are unfilled holes. Therefore, it is necessary to solve the problem of localized residual stress concentration. Prior art literature

[0010] 1. Metal material for 3D printing and 3D printing method using the same according to Registered Patent No. 10-2321875 (Registered October 29, 2021) 2. Method for manufacturing a dual 3D molded article according to Published Patent No. 10-2016-0127623 (Published November 4, 2016) 3. Flexible strain sensor for heterogeneous material FDM 3D printing according to Published Patent No. 10-2023-0138147 (Published October 5, 2023) The problem to be solved

[0011] The present invention was created to solve the above-mentioned problems, and aims to provide a 3D-printed metal flat plate member that employs a deformation-reducing dummy, which is designed to cover a hole when making a flat plate structure by 3D printing, thereby alleviating residual stress concentration during 3D printing stacking. means of solving the problem

[0012] The present invention for achieving the above-mentioned objectives Flat dummy structure for reducing deformation Is,

[0013] When making a metal flat plate member by 3D printing, a layer is deposited in the opening formed in the metal flat plate member to reduce deformation of the opening.

[0014] In the present invention, the dummy is formed by a combination of a bulk structural plate and a lattice structure so that it can be removed after 3D printing and stacking in the opening of a metal flat plate member.

[0015] In the present invention, the dummy is made of a metal material.

[0016] In the present invention, the dummy and the base plate are connected by a grid-shaped wire so that the dummy can be easily separated from the base plate after the 3D printing process.

[0017] In the present invention, the grid may be cross or straight, and the thickness of the wire constituting the grid is 0.1 to 1 mm.

[0018] In the present invention, the dummy is formed in the shape of a flat plate.

[0019] In the present invention, the dummy covers the opening with an area of ​​70% or more, and the lattice structure is configured with an area of ​​30% or less.

[0020] The 3D-printed metal flat plate member of the present invention for achieving the above-mentioned purpose employs the flat plate type deformation reduction dummy structure. Effects of the invention

[0021] According to an embodiment of the present invention, when a flat structure is made by 3D printing in the past, a phenomenon of localized residual stress concentration occurred at the opening of the structure, but by employing a dummy structure plate in the form of a metal plate that can cover the opening, the concentration of residual stress during 3D printing stacking was alleviated. Brief explanation of the drawing

[0022] Figures 1 (a) to (d) are photographs of the degree of deformation measured by 3D scanning after 3D printing a conventional flat-plate part. FIG. 2 is a plan view showing the configuration of a flat plate deformation reduction dummy structure according to the present invention and a 3D-printed metal flat plate member employing the same. FIG. 3 is a 3D scanning photograph of a 3D-printed metal flat plate member employing a deformation-reducing dummy according to the present invention. Specific details for implementing the invention

[0023] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0024] As shown in FIG. 1 (a) to (d), a flat part, such as a fuel cell separator made of pure titanium, is 3D printed, and the degree of deformation is measured by a 3D scanning method.

[0025] In Figure 1, it can be seen that the maximum displacement (0.31, 0.16, -0.14, -0.14 mm from (a)) appears around the hole in the plate labeled 'H'.

[0026] The present invention is designed to alleviate residual stress concentration at openings during 3D printing by designing a combination of a dummy structural plate in the form of a metal plate that can cover a hole when making a flat structure by 3D printing, and a lattice structure with reduced strength relative to the structural plate so that the dummy structural plate can be easily separated from the base material after the process.

[0027] FIG. 2 shows a plan view illustrating the configuration of a flat plate deformation reduction dummy structure according to the present invention and a 3D-printed metal flat plate member employing the same.

[0028] Referring to FIG. 2, a flat dummy structure for reducing deformation according to the present invention is laminated onto an opening (101) formed in the metal flat member (100) to reduce deformation of the opening (101) when the metal flat member (100) is made by 3D printing.

[0029] And the above dummy (110) is made of a combination of a bulk structural plate and a lattice structure so that it can be removed after being 3D printed and laminated into the opening (101) of the metal flat plate member (100).

[0030] In addition, the above dummy (110) is made of metal material.

[0031] And the dummy (110) and the base plate are connected by a grid-shaped wire so that the dummy (110) can be easily separated from the base plate after the 3D printing process.

[0032] In addition, the grid may be cross (X) or straight ( / / ), and the thickness of the wire constituting the grid is 0.1 to 1 mm.

[0033] In addition, the above dummy (110) covers the opening (101) with an area of ​​70% or more, and the lattice structure is configured with an area of ​​30% or less.

[0034] And the flat deformation reduction dummy structure described above is adopted in the 3D printed metal flat plate member (100).

[0035] The operation of the flat plate deformation reduction dummy structure according to the present invention having the configuration described above and the 3D printed metal flat plate member employing the same is explained as follows.

[0036] Referring again to FIG. 2, when a flat structure, that is, a metal flat plate member (100), is made by 3D printing, a phenomenon of localized residual stress concentration occurs at the opening (101) of the metal flat plate member (100).

[0037] Accordingly, the flat plate deformation reduction dummy structure according to the present invention and the 3D printed metal flat plate member (100) employing the same solve the above-mentioned problem by designing a dummy (110) in the form of a metal plate that can cover the opening (101) to alleviate the concentration of residual stress during 3D printing stacking.

[0038] Specifically, referring again to FIG. 2, a flat plate-shaped dummy (110) is attached to the opening (101) of a metal flat plate member (100) and removed after the process, and in order to make removal easy, it is connected to the metal flat plate member (100) in a grid shape.

[0039] To demonstrate this effect, 3D scanning was performed on a metal flat plate member (100) that had undergone 3D printing, as shown in FIG. 3.

[0040] As seen in FIG. 3, unlike the conventional method where deformation was concentrated because the opening (101) was covered, it can be seen that deformation concentration has disappeared.

[0041] Therefore, when 3D printing a part with a complex flat structure, if stress and displacement are concentrated in the opening (101) and deformation occurs that exceeds the allowable dimensional tolerance, the concentration of residual stress in the part with the flat structure can be relieved by using the technology of the 3D printed metal flat member (100) with a deformation-reducing dummy according to the present invention.

[0042] As described above, the present invention has been explained with reference to an embodiment illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom.

[0043] Therefore, the true scope of protection of the present invention must be determined solely by the appended claims. Explanation of the symbols

[0044] 100. Metal flat plate member 101. Opening 110. Dummy structural board

Claims

Claim 1 A flat-type deformation-reducing dummy structure that is deposited in an opening formed in a metal flat-plate member to reduce deformation when making a metal flat-plate member by 3D printing, wherein the dummy is formed by a combination of a bulk structural plate and a lattice structure so as to be removed after 3D printing deposited in the opening of the metal flat-plate member, wherein the lattice structure is formed such that its strength is weakened relative to the bulk structural plate, wherein the dummy is formed to correspond to the shape of the opening, wherein the dummy and the metal flat-plate member are connected by a grid-shaped wire at the edge of the opening, wherein the grid-shaped wire may be cross or straight, wherein the thickness of the wire constituting the grid is 0.1 to 1 mm, and wherein the dummy is configured to cover the opening with an area of ​​70% or more. Claim 2 In claim 1, the dummy is a flat plate-type deformation-reducing dummy structure made of a metal material. Claim 3 In claim 1, the dummy is a flat plate-shaped dummy structure for reducing deformation. Claim 4 A 3D-printed metal flat plate member employing a flat plate deformation-reducing dummy structure according to any one of paragraphs 1 to 3. Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete

Images