KR102075919B1 - Light-weight 3d pattern structure for bidner-jet 3d printing, the 3d patterned molds for casting process and the casting process using them - Google Patents

Abstract

The present invention relates to a three-dimensional lightweight pattern structure for binder-jet 3D printing, a mold for casting process using the same, and a casting process method.
More specifically, in the 3D pattern structure for 3D printing, it is composed of a first stacked surface and a second stacked surface formed to include a plurality of empty spaces, and the second stacked surface is a lower portion of the first stacked surface. The three-dimensional lightweight pattern structure for 3D printing, and a casting and casting process method using the binder-jet method 3D printing, characterized in that the plurality of empty spaces are respectively formed in a spherical shape and arranged to form a dense structure between each other. It is about.

Description

Binder-jet type 3D light weight pattern structure for 3D printing, mold and casting process for casting process using the same

The present invention relates to a pattern structure of ceramic and ceramic-polymer composites for the production of lightweight molds for the casting process, and more specifically, three-dimensional weight reduction of ceramic and ceramic-polymer composites realized using a spherical hollow space. It relates to a pattern structure, a mold for a casting process using the same, and a casting process method.

The casting process, which is one of the most widely used metal processing processes, requires molds of sand or wax materials, and the molds usually start with woodworking. However, with the recent development of 3D printing technology, in particular, the binder-jet technology of the foundry, the sand mold, which is a sand mold, can be cast without a mold.

3D printing refers to the manufacturing technology of additive manufacturing method that creates a 3D object by spraying a continuous layer of material. The prevalence of 3D printing technology has a great social impact because it can break away from the existing production methods such as machine cutting and forming, and produce products of any type in a batch method.

3D printing technology can be important to proceed with the process with different types of 3D printers depending on the purpose of the process. This is because various types of materials and 3D printers can be applied to various processes, but the subsequent processing process may vary.

Among them, the above-described binder-jet technology corresponds to a method of spraying a liquid adhesive or a binder on a powder bed in which powders are thinly laminated. The binder-jet technology is mainly used for mold production such as sand mold for metal manufacturing processes as well as for art and architecture. The sand mold is a mold and essential for the casting process to pour molten metal and harden it to form a mold.

In particular, despite the great advantage of using the binder-jet technology, it is possible to immediately make a sand mold without the wood mold necessary in the existing construction method, but the cost required for the material and process used is very expensive, so the existing wood mold There is a certain level of limitation in the substitution of the death penalty production method using.

Accordingly, in the existing Korean Patent No. 10-1820943 (name: Method for manufacturing a ceramic mold or heavy and slurry composition using a 3D printer), a heterogeneous polymer was used to develop a process for the ceramic mold and core slurry composition process. A related art is disclosed.

In addition, the existing Korean Patent No. 10-0942924 (name: method and device for manufacturing a mold for sand casting) is a method for manufacturing a mold for sand casting by direct laser sintering technique and a mold for casting a core. And devices.

However, even with the existing technology, a problem-solving technique related to the amount of material used and the manufacturing process cost in the binder-jet technology is not presented. Therefore, there is a need to present a technique for reducing the amount of existing materials to be used, and a technique for reducing the weight of ceramics and ceramic-polymers, and a technique for maintaining the structure with a certain level of strength.

Republic of Korea Registration No. 10-180943 Republic of Korea Registration No. 10-0942924

The object of the present invention for solving the above problems is to implement a lightweight structure of a ceramic and ceramic-polymer composite, and to maintain a certain level of strength during the casting process, each of the spherical empty spaces form a dense structure It is to provide a pattern structure of ceramic and ceramic-polymer composite to be suitable for the binder-jet 3D printing technology.

Another object of the present invention for solving the above problems is to provide a mold for a casting process consisting of a pattern structure of the ceramic and ceramic-polymer composite and a casting process method using the same.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. There will be.

The configuration of the present invention for achieving the above object is in the three-dimensional pattern structure for 3D printing, consisting of a first laminated surface and a second laminated surface formed to include a plurality of empty spaces, the second laminated surface Provides a three-dimensional lightweight pattern structure for binder-jet 3D printing, characterized in that is disposed under the first laminated surface, and the plurality of empty spaces are each formed in a spherical shape to form a dense structure. .

In an embodiment of the present invention, the shape of the empty space may be characterized by being composed of a partially deformed three-dimensional elliptical structure or a polygonal structure.

In an embodiment of the present invention, the first laminated surface is a first spherical empty space disposed at each corner of the hexagon to form a hexagon; And a hollow space of a central sphere disposed at a point that becomes a center of the hexagon, wherein the hexagonal space of the first spherical hollow space and the hollow space of the central sphere is continuously connected and arranged. Can be.

In an embodiment of the present invention, the second stacked surface includes a second spherical empty space disposed at each corner of the triangle to form a triangle centering a point corresponding to the empty space of the central sphere, It may be characterized in that the triangle formed of the second spherical empty space is configured to be continuously connected and arranged.

In an embodiment of the present invention, the first stacked surface and the second stacked surface may be characterized by being repeatedly arranged to be stacked alternately and continuously.

In an embodiment of the present invention, the cylinder may further include a cylinder connecting the empty space so that the gas or powder in the empty space can be easily discharged to the outside, and the cross-section of the cylinder may be formed in a circular shape.

In an embodiment of the present invention, it may be characterized in that the cross section of the cylinder is made of a polygonal shape.

In an embodiment of the present invention, the size of the cross-section of the cylinder is not constant, and may be characterized by varying at each position.

In an embodiment of the present invention, the cylindrical cylinder is formed so as to connect only the center of the empty space formed corresponding to the same line on the first stacked surface or the second stacked surface repeatedly stacked on the same stacked surface. Can be done with

In an embodiment of the present invention, the cylindrical cylinder may be formed to connect the centers of the empty spaces formed on the first and second stacked surfaces repeatedly stacked to each other on different stacked surfaces. Can be.

In an embodiment of the present invention, the structure density, which is the ratio of the actual solid volume after being reduced by the application of an empty space pattern having a spherical and cylindrical structure to the total solid volume before the pattern is applied, is 0.36 or more and 0.7 or less. It can be characterized by.

Another configuration of the present invention for achieving the above object is composed of a ceramic and ceramic-polymer composite, the ceramic and ceramic-polymer composite is any one of the three-dimensional lightweight pattern structure for the above-described binder-jet printing method It provides a mold for a casting process characterized in that the structure of the.

Another configuration of the present invention for achieving the above object is a metal heating step of heating the metal to the melting temperature; A molten metal injection step of injecting the molten metal into a mold for a casting process before solidification; And a metal coagulation step in which the molten metal returns from the liquid state to the solid state by a cooling action, and the casting process mold provides a casting process method characterized by using the casting process casting mold.

The effect of the present invention according to the above configuration is to reduce the amount of use of casting sand-binder or wax by implementing the pattern structure of the ceramic and ceramic-polymer composite as a dense structure of a spherical empty space, and to implement a differentiated lightweight structure.

 Another effect of the present invention, which is different from the above configuration, is to maintain a certain level of safety strength during the casting process by providing a stacked pattern of spherical empty spaces capable of minimizing stress concentration despite the light weight.

It should be understood that the effects of the present invention different from the above-described configuration are not limited to the above-described effects, and include all effects deducible from the configuration of the invention described in the detailed description or claims of the present invention. do.

1 is a schematic view of a first laminated surface and a second laminated surface of a pattern structure suitable for a binder-jet 3D printing according to an embodiment of the present invention.
2 is a schematic diagram of a pattern structure suitable for 3D printing of a binder-jet method according to an embodiment of the present invention.
3 (a) is a square hole array structure which is a lightweight structure method of a conventional metal 3D printer as an experiment subject.
3 (b) is a 3D mesh lattice structure which is a lightweight structure method of an existing metal 3D printer as an experiment subject.
Figure 4 (a) is a graph showing a change in the compressive strength of the structure according to the change in the size of the hole (hole) inside the structure having a square hole array structure, a lightweight structure of the existing metal 3D printer.
FIG. 4 (b) is a graph showing a change in compressive strength of a structure according to a change in the thickness of an internal mesh for a structure having a 3D mesh lattice structure, which is a lightweight structure method of a conventional metal 3D printer.
5 (a) is experimental data of a structure simulation using a finite element method for a 3D mesh lattice structure which is a lightweight structure method of a conventional metal 3D printer.
Fig. 5 (b) shows the results of the destruction of the structure of the 3D mesh lattice structure, which is a lightweight structure method of the existing metal 3D printer, as a result of the actual experiment.
6 is a graph showing the compressive strength according to the structural density of a structure having a 3D mesh lattice structure and a spherical void stacked structure according to the present invention.
7 is a flowchart of a casting process method using a casting process mold made of a pattern structure suitable for a binder-jet 3D printing according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "It also includes the case where it is. Also, when a part “includes” a certain component, this means that other components may be further provided instead of excluding other components, unless otherwise stated.

The terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The process of melting a metal into a liquid and pouring it into a mold to harden it is called a casting process. The casting process, one of the most widely used metalworking processes, requires a mold of sand or wax material, which usually starts with the production of wood.

However, among the recent 3D printing technologies, the binder-jet technology of casting sands enables sand molds, which are sand molds, to be produced without a wooden mold. However, the above technique is very expensive to use materials and processes, and requires a lot of time in the process, thus showing limitations in completely replacing the existing woodblock method.

Therefore, the present invention proposes a lightweight structure technology for reducing the amount of use of existing materials such as sand or wax by reducing the volume by forming a unique pattern structure for binder-jet 3D printing. Through this, the amount of material used and the process time are shortened to promote the proliferation of the 3D printing process in mold production.

In addition, as a unique structure for weight reduction, while reducing the volume of the molded body, it implements a pattern structure that maintains a certain level of safety strength by preventing stress from being concentrated on a specific part of the weight reduction pattern during transportation and casting. I want to.

3D printing is a manufacturing technique that creates a 3D object by spraying a continuous layer of material. A 3D printer is a device that produces a three-dimensional object in a lamination method similar to that used in conventional inkjet printers rather than milling or cutting, and since it is controlled by a computer, it has a variety of forms and is easy to use compared to other manufacturing technologies.

Since the post-processing process may vary depending on the purpose of the 3D printer, it is important to carry out the process with different types. Among them, the above-described binder jetting (Binder jetting) is a method of spraying an adhesive or a binder on a powder bed, and does not melt the solid powder by heat, but bonds the powder using an adhesive.

The existing 3D printing technology for plastics overcomes the process limitations encountered in the existing design and manufacturing process such as design shape, dimension, and material complexity through DfAM (Design for Additive Manufacturing).

In fact, many companies at home and abroad use DfAM technology for plastic and metal and carbon composite materials to manufacture component modules of complex functions and shapes in one piece without separate assembly, as well as high rigidity, low vibration, and complex internal structures. The effect of weight reduction etc. is aimed at.

Hereinafter, the applicability of the lightweight structure method used in the existing metal 3D printer structure to the structure composed of the ceramic and ceramic-polymer composite is reviewed, and the lightweight structure method different from the existing method according to the present invention is considered in consideration of the characteristics of the foundry. Explain.

To this end, strength tests and FEM simulations were performed on structures having a light-weight structure that was used in the existing metal 3D printer structures and structures with a stack of circular empty spaces in the form of atomic stacks of FCC, BCC, and HCP. The strength value compared to the reduction was tested and compared.

The experimental results of applying the lightweight structure used for the existing metal 3D printer structure to the ceramic and ceramic polymer-composite structures will be described in detail through FIG. 3 showing the test subject and FIG. 4 showing the graph of the demonstration result.

3 is a test sample object, object (a) is a structure of a conventional metal 3D printer, and shows a type 1 of a square array hole structure in which holes are arranged in a square, and object (b) is a mesh of upper and lower surfaces. It shows a type 2 with a 3D mesh with pads structure forming a grid.

4 is a result of the strength test for the Type 1 and Type 2, the graph (a) shows the strength data obtained by changing the size of the hole (hole) inside the Type 1 structure, the graph (b) is The strength data obtained by changing the thickness of the mesh inside the type 2 structure is shown.

As a result of the graph (a), it can be seen that when the size of the hole is increased in order to create a lightweight structure by performing 3D printing, the strength value is greatly reduced. In addition, as a result of the graph (b), it can be seen that when the thickness of the mesh becomes thin, there is a problem that the strength value of the structure is greatly reduced.

Fig. 5 (a) shows the results of 3D and 2D stress distribution of the sample after the displacement per hour is applied as a result of the structural simulation. The purpose of the structure simulation is to predict the fracture surface by analyzing the stress concentration inside the sample casting sand test specimen using the finite element method, and to compare the simulation and the actual failure through the fracture of the actual test specimen.

In the above structure simulation, the structure of the casting sand test piece is composed of a bulk structure at the top and bottom and a lattice structure at the center, and an upper bulk pad at a rate of -0.0002m / s, which is the same condition as the actual compression test at the top. Deformation was applied to the top surface of the (Top bulk pad). The bottom is restricted so that it cannot move perpendicularly to the bottom surface, and conditions are set so that it can move freely on a flat part.

The test was a simulation that gave displacement per hour rather than a constant load, and was conducted at 0.01 second intervals for 0.1 second in a time dependent mode. As a result of the simulation, it can be seen that 0.4 MPa or more is concentrated in the tensile stress at the outer portion of each beam of the lattice structure.

In the case of a low-strength ceramic composite such as this sample, since it is particularly weak in tensile strength rather than compressive strength, it is judged that the tensile stress is vulnerable to the outer portion of the beam, so that the fracture will proceed first. As shown in Fig. 5 (b), it was confirmed that the results of the actual experiment also coincided with the first destruction and progress of the beam.

Therefore, when using the lightweight structure method used in the existing metal 3D printer structure, it can be seen that despite the lightening effect of the structure, the tensile stress is concentrated in the 3D diagonal mesh structure, so that it is easily destroyed or the strength is rapidly reduced.

Therefore, in order to apply a lightweight structure to a 3D printer, a lightweight construction method that differs from the existing method is required in consideration of the characteristics of the casting company. Accordingly, a new stacked pattern structure using spherical hollow spaces that can minimize stress concentration is required. Is required.

1 and 2 show a pattern structure of ceramic and ceramic-polymer composites suitable for binder-jet 3D printing in a spherical atomic lamination form using a spherical void according to an embodiment of the present invention. City.

The present invention proposes a new lightweight pattern structure configured by applying a metallic atomic lattice structure to form a dense structure by laminating spherical empty spaces together with a spherical atomic lattice structure.

The configuration of the present invention is composed of a first stacked surface 100 and a second stacked surface 200 formed to include a plurality of empty spaces, and the second stacked surface 200 is the first stacked surface 100 Arranged in the lower portion, the plurality of empty spaces are each formed in a spherical shape, forming a three-dimensional lightweight pattern structure for a binder-jet 3D printing, characterized in that arranged to form a dense structure with each other.

According to an embodiment of the present invention, the shapes of the plurality of empty spaces may be formed of a 3D elliptical structure or a 3D polygonal structure partially modified to be suitable for forming a stacked structure as well as a spherical shape.

Also, according to an embodiment of the present invention, a cylinder 300 may be manufactured and connected to other new lightweight structures to remove casting sand that may exist between the spherical empty space and the empty space. Hereinafter, a stack structure of the plurality of spherical empty spaces and the cylinder 300 will be described.

The efficient stacking structure of spherical bodies known in nature is a lattice structure of metal spherical atoms, body centered cubic lattice (BCC), face centered cubic lattice (FCC) and dense hexagonal structure (Hexagonal Close Packed lattice, hereinafter 'HCP') is a representative.

The body-centered cubic lattice (BCC) structure is a structure in which one atom is placed at each corner of the cube and one atom is placed at the center, and two atoms belong to the unit lattice. The face-centered cubic (FCC) structure is a structure in which one atom is placed at each corner and face, and four atoms belong to the unit lattice.

The dense hexagonal (HCP) structure is a type in which three atoms are placed in an intermediate layer lattice between the upper and lower base surfaces with one atom at the center and a hexagonal surface corner on the base surfaces of the upper and lower sides, and six atoms belong to the unit lattice. Assuming the shape of the atom as a general spherical body, the packing density (Atomic Packing density) of each structure is the same for HCP and BCC as 0.74, and the BCC is slightly lower at 0.68.

FIG. 6 shows a graph of evaluating compressive strength of each lightweight structural pattern for each density by changing the size of the spherical empty space for each structure and the size of the cylindrical cylinder 300. The graph shows the change in compressive strength for each structure using the structural density, that is, the ratio of the empty space to the overall structure as a variable.

As shown in Figure 6, compared to the structure of the existing metal lightweight structure 3D mesh (Mesh) structure, the structure of the laminated structure (Void Cylinder Array) using the hollow space according to an embodiment of the present invention It can be seen that it shows a relatively high compressive strength.

In addition, it can be seen that among the stacked structures, the dense hexagonal (HCP) structure maintains relatively high compressive strength compared to the body-centered cubic (BCC) structure or the face-centered cubic (FCC) structure.

Therefore, as a result of this experimental graph, the dense hexagonal (HCP) structure shows the best compressive strength compared to the ratio of the empty space of the sphere in the structure compared to other spherical atomic stacked structures, so it is suitable for application to lightweight structures. You can see that it is most suitable.

Accordingly, an embodiment of the present invention may be characterized in that the empty spaces of the spherical shape are stacked in a dense hexagonal structure (HCP) as shown in FIGS. 1 and 2 according to the results of the experiment. The laminate structure of a more detailed spherical empty space will be described below.

As shown in FIG. 1, according to an embodiment of the present invention, the first stacked surface 100 forms a hexagonal shape, and a first spherical empty space 110 and the hexagonal shape arranged at each corner of the hexagonal shape It comprises a hollow space 120 of the central sphere arranged at the center of the, the first spherical hollow space 110 and the hexagon consisting of the hollow space 120 of the central sphere is arranged and configured to be continuously connected It can be characterized as.

In addition, the second laminated surface 200 is composed of a second spherical empty space 210 arranged in each corner of the triangle, forming a triangle so as to center the point corresponding to the empty space of the central configuration, the It may be characterized in that the triangle formed of the second spherical empty space 210 is arranged to be continuously connected.

And as shown in Figure 2, the first stacked surface 100 and the second stacked surface 200 are alternately arranged so as to be stacked alternately and continuously, so that the spherical empty space is stacked like an HCP structure. It can be characterized as.

Also, as described above, the cylinder may further include a cylinder connecting the empty space so that the gas or powder in the empty space can be easily discharged to the outside, and the cross section of the cylinder may be formed in a circular shape. In addition, the cylinder 300 may be connected between different lamination surfaces as necessary.

When the mold for the casting process is produced through the cylinder 300 or the casting process using the same, gases or powders that may remain in the empty space of the spherical shape can be easily discharged.

According to an embodiment of the present invention, the cylinder 300 may be formed not only in a cylindrical shape, but also in a polygonal shape in cross section of the cylinder 300. In addition, similar to the shape of the cone, the cylinder 300 may be characterized in that the cross section of the cylinder 300 does not remain constant and varies from position to position.

According to the result of the compression strength test of the test piece according to the density of the casting yarn of FIG. 6, the dense hexagonal (HCP) pattern structure of the hollow spaces according to the embodiment of the present invention is the total solid volume before the pattern is applied. It is possible to confirm the compressive strength data when the ratio of the actual solid volume after reduction by application of the empty space pattern having the contrast spherical and cylindrical structure, that is, the structural density is 0.36 or more and 0.7 or less. Therefore, an embodiment of the present invention may be characterized in that the structural density is 0.36 or more and 0.7.

In addition, an embodiment of the present invention is a mold for a casting process made of a ceramic and ceramic-polymer composite, wherein the ceramic and ceramic-polymer composite is a pattern in which the hollow spaces of the present invention are stacked in a compact hexagonal (HCP) structure. It may be characterized by consisting of a ceramic and a ceramic-polymer composite made of a structure.

In addition, an embodiment of the present invention is a step of heating the metal to the melting temperature as a casting process method (S100); And injecting the molten metal into a mold for a casting process before solidification (S200) and returning the molten metal from a liquid state to a solid state again by a cooling action (S300). The casting process of the ceramic and ceramic-polymer composite according to an embodiment of the present invention has a ceramic and ceramic-polymer composite made of a pattern structure in which the spherical empty space of the present invention is stacked in a dense hexagonal (HCP) structure. It can be characterized as being a dragon mold.

In this case, a mold formed of a three-dimensional lightweight pattern structure according to an embodiment of the present invention is utilized in the step (S200) of injecting the molten metal, and then the sand mold must maintain thermal and mechanical stability until the metal solidification process (S300). do.

Accordingly, by applying the new layered pattern structure according to the present invention to the structure during the 3D printing of a binder-jet (Binder-Jet), the structure is made lighter in weight, reducing the amount of material used and the processing time, and at the same time a certain level of safety. It is expected that the process using 3D printing in the production of molds will be spread by maintaining the strength of the product.

In addition, the present invention is significant in that it extends DfAM (Design for Additive Manufacturing), a lightweighting technique for 3D printing of metal and plastic materials, to ceramic and ceramic-polymer composites for mold production.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains can understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted to be included in the scope of the present invention.

100: first laminated surface
110: empty space of the first spherical shape
120: empty space in the center sphere
200: second laminated surface
210: second spherical empty space
300: cylinder

Claims (13)

In the three-dimensional pattern structure for 3D printing forming a mold for the casting process,
In order to be formed to include a plurality of empty spaces, a first spherical empty space disposed at each corner of the hexagon to form a hexagon, and a central spherical empty space disposed at a central point of the hexagon, A first laminated surface formed of a ceramic and ceramic-polymer composite;
In order to be formed to include a plurality of empty spaces, a second spherical empty space is disposed at each corner of the triangle to form a triangle that centers a point corresponding to the empty space of the central sphere, and includes ceramic and ceramic -A second laminated surface formed of a polymer composite; And
A cylinder that is connected to one or more empty spaces selected from the first spherical empty space, the central spherical empty space, and the second spherical empty space to discharge gas or powder remaining in the connected empty space during the casting process to the outside. ;
The second laminated surface is disposed below the first laminated surface,
The plurality of empty spaces are each formed in a spherical shape, and are arranged to form a dense structure with each other,
3D lightening pattern structure for binder-jet 3D printing, characterized in that the strength is increased even by implementing a 3D pattern structure for light weight by preventing a phenomenon that stress is concentrated on a specific area in the 3D pattern structure for light weight.
According to claim 1,
The shape of the empty space is a three-dimensional lightweight pattern structure for binder-jet 3D printing, characterized in that it consists of a partially deformed three-dimensional elliptical structure or a polygonal structure.
According to claim 1,
The first stacked surface is a three-dimensional lightweight pattern structure for a binder-jet 3D printing, characterized in that the hexagonal space consisting of the first spherical empty space and the central spherical empty space is continuously connected and arranged.
According to claim 1,
The second stacked surface includes a second spherical empty space disposed at each corner of the triangle to form a triangle that centers a point corresponding to the empty space of the central spherical shape, and the empty space of the second spherical shape. A three-dimensional lightweight pattern structure for a binder-jet 3D printing, characterized in that the triangles made of are continuously connected and arranged.
According to claim 1,
A three-dimensional lightweight pattern structure for a binder-jet 3D printing, characterized in that the first laminated surface and the second laminated surface are alternately arranged to be stacked alternately and continuously.
According to claim 1,
The cross-section of the cylinder is a three-dimensional lightweight pattern structure for binder-jet 3D printing, characterized in that made of a circular shape.
The method of claim 6,
A three-dimensional lightweight pattern structure for binder-jet 3D printing, characterized in that the cross section of the cylinder is formed in a polygonal shape.
The method of claim 6,
A three-dimensional lightweight pattern structure for binder-jet 3D printing, characterized in that the size of the cross section of the cylinder is not constant and varies at each position.
The method of claim 6,
Cylindrical cylinder for binder-jet 3D printing, characterized in that the center of the spherical empty space formed corresponding to the same line on the first stacked surface or the second stacked surface repeatedly stacked is connected only on the same stacked surface. 3D lightweight pattern structure.
The method of claim 6,
Cylindrical cylinder is a three-dimensional binder-jet method for 3D printing, characterized in that the centers of the empty spaces formed on the first and second stacked surfaces repeatedly stacked are connected to each other on different stacked surfaces. Lightweight pattern structure.
According to claim 1,
Binder-jet method 3D, characterized in that the structural density, which is the ratio of the actual solid volume after reduction by the application of an empty space pattern having a spherical and cylindrical structure to the total solid volume before the pattern is applied, is 0.36 or more and 0.7 or less. 3D lightweight pattern structure for printing.
Composed of ceramic and ceramic-polymer composites,
The ceramic and ceramic-polymer composite is a casting process mold characterized in that it consists of a three-dimensional lightweight pattern structure for printing any one of claims 1 to 11 of the binder-jet method.
A metal heating step of heating the metal to a melting temperature;
A molten metal injection step of injecting the molten metal melted in the metal heating step into a mold for a casting process before solidification; And
And a metal coagulation step in which the molten metal returns from the liquid state to the solid state again by a cooling action.
The casting process method, characterized in that using the casting process mold of claim 12.

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