KR102453291B1 - Binderjet 3D printing apparatus and method - Google Patents

Abstract

The present invention relates to a binder jet 3D printing device and a method thereof, and more specifically, to a binder jet 3D printing device and a method thereof capable of simultaneously performing flattening and curing to perform continuous stacking work without waiting time for curing unlike a conventional 3D printer. According to an embodiment of the present invention, the binder jet 3D printing device comprises: a build stage (1) which provides a space in which particulate materials (M) are stacked; a print head (2) which applies a binder (B) to the stacked particulate materials (M); and a flattening unit which flattens the particulate materials (M) stacked in the build stage (1) in an upper part of the build stage (1). By including a heating unit in the flattening unit, the binder jet 3D printing device stacks and flattens the particulate materials (M) and cures the binder (B) applied to the particulate materials (M) through the flattening unit at the same time.

Description

Binderjet 3D printing apparatus and method

The present invention relates to a binderjet 3D printing apparatus and method, and more particularly, binderjet 3D printing in which flattening and curing are simultaneously performed so that continuous lamination work is possible without waiting time for curing, unlike conventional 3D printers. An apparatus and method are provided.

Using a binder (hardener) to solidify/bond/harden particulate materials (sand, metal, polymer, ceramic, wood, cellulose, lactose, salt, carbon, hard material, glass, cement, gypsum, etc.) A 3D printer device that outputs

Korean Patent Application Laid-Open No. 10-2016-0078355 discloses “a method and a device for producing a three-dimensional model using a binder agent system”.

In the above patent document, ① coating a powder coater on the particulate material in advance, applying a binder to the particulate material, ② laminating two to three layers (layers), and then having a waiting time for curing with an IR lamp 3D output is output in this way.

In the conventional 3D printer apparatus as described above, it is impossible to reuse the particulate material used in the sense that ① it is a two-component method using a powder coater and a binder for the particulate material (the particulate material/coating agent/binder, etc. are deformed in the curing step, etc.) , in the two-component method, the curing method (direct (conduction) heating method through a roller) according to an embodiment of the present invention cannot be used. In addition, ② there is a limitation in that the overall work speed is remarkably slow because a curing method using an IR lamp (radiant heat) is adopted.

The problem to be solved by the present invention is, in order to solve the limitations of the conventional (binder jet method) 3D printing apparatus as described above, planarization work and hardening work of the particulate material (laminate) are simultaneously performed, and the particulate material is An object of the present invention is to provide a one-component binderjet 3D printing apparatus capable of outputting a three-dimensional output with only a single binder application without any pretreatment (using a coating agent, etc.).

The present invention provides a build stage (1) providing a space in which the particulate material (M) is laminated in order to solve the limitations of the conventional 3D printing apparatus as described above; a print head (2) for applying a binder (B) to the laminated particulate material (M) on the upper part of the build stage (1); and planarization means for flattening the particulate material M stacked on the build stage 1; wherein the flattening means includes a heating means, and through the planarization means, the particulate material M is laminated and Provided is a binderjet 3D printing apparatus for flattening and curing the binder (B) applied to the particulate material (M) at the same time.

In addition, the flattening means includes: a roller 3 having a cylindrical shape having a predetermined diameter; Shafts 4 extending to both sides of the roller 3, respectively; a bearing 5 connected to the shaft 4 and fixing the shaft 4 in a direction perpendicular to the axial direction; and conveying means connected to the bearing (5) for conveying the roller (3) in a horizontal direction with respect to the laminated particulate material (M). The roller 3 may be configured to flatten the particulate material M by pressing and conveying the laminated particulate material M.

And, a feed stage (6) provided within a predetermined distance from the build stage (1) to store the particulate material (M) to be supplied to the build stage (1); including; It may be configured to feed a portion of the particulate material M of the stage 6 to the build stage 1 .

In addition, the build stage (1) and the feed stage (6) is provided with a height adjustment means (7), respectively; to supply the particulate material (M) from the feed stage (6) to the build stage (1) Before, the height of the feed stage 6 is adjusted so that the surface of the particulate material M of the feed stage 6 is at a position higher than the surface of the particulate material M of the build stage 1, and the print head 2 Before applying the binder (B) at can be configured to

In addition, the heating means includes: a heating wire (8) accommodated inside the roller (3); and a temperature sensor 9 provided in the roller 3; may be configured to heat and maintain the temperature of the surface of the roller 3 within a set temperature range with the heat generated by the heating wire 8.

And, the particulate material (M) is selected from the group comprising: sand, metal, polymer, ceramic, wood, cellulose, lactose, salt, carbon, hard material, glass, cement and gypsum, wherein the print head (2) Before the binder (B) is applied from the binder (B), it may be configured not to be coated with a material other than the binder (B).

In addition, the binder (B): 26 to 41 wt% of silicate, 3 to 5 wt% of an additive, and 54 to 71 wt% of a solvent containing a humectant It may be composed of an inorganic binder. .

Also, 1) storing the particulate material (M) in the feed stage (6); 2) conveying the particulate material (M) from the feed stage (6) to the build stage (1) and flattening at the same time; 3) applying a binder (B) to the flattened particulate material (M) in the build stage according to the shape of the output (O); 4) flattening the particulate material (M) to which the binder (B) is applied again and curing the same; By repeating steps 2) to 4) to stack the particulate material (M), there is provided a binder jet 3D printing method for printing an output (O) of a three-dimensional shape.

And, it provides a 3D printer output, output by any one of the binder jet 3D printing apparatus and the binder jet 3D printing method as described above.

According to an embodiment of the present invention, the curing time can be remarkably shortened by directly heating the particulate material and the binder by the planarization means (heat conduction method) through the heating member provided in the planarization means (rollers).

In addition, since there is no need for any special coating operation on the particulate material (using a one-component binder), the particulate material part constituting the part other than the output after curing can be recycled as it is (for example, 'sand' as particulate material) is used, the sand has only been heated, and the sand can be used as it is to make other prints).

In addition, by using the direct heating method instead of the IR lamp, there is no need to separately control the humidity of the build stage during curing, and it is possible to quickly produce an output without preheating the particulate material.

In addition, the inorganic binder according to an embodiment of the present invention has excellent viscosity and surface tension, so that discharge stability is secured, and the strength of the manufactured 3DP mold is excellent.

1 is a schematic diagram showing a method for manufacturing an inorganic binder for 3D printing according to an embodiment of the present invention.
2 is a result of discharging using the binder according to Example 1 of the present invention.
3 is a result of discharging using the binder according to Example 2 of the present invention.
4 is a result of discharging using the binder according to Comparative Example 1 of the present invention.
5 is a result of discharging using a binder according to Comparative Example 2 of the present invention.
6 is a photograph showing the discharge results of Examples 3 to 6, respectively.
7 is a view illustrating a state in which a particulate material is supplied to a build stage in a binder jet 3D printing apparatus according to an embodiment of the present invention.
8 is a view showing a state in which a binder is applied to a particulate material in a binder jet 3D printing apparatus according to an embodiment of the present invention.
9 is a view showing a state in which the particulate material is planarized and cured (heated) in the binder jet 3D printing apparatus according to an embodiment of the present invention.
10 is a perspective view illustrating a roller used in a binder jet 3D printing apparatus according to an embodiment of the present invention.
11 is a cross-sectional view illustrating a roller used in a binder jet 3D printing apparatus according to an embodiment of the present invention.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. However, it is not intended to limit the technology described in this document to specific embodiments, and it should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of this document. . In connection with the description of the drawings, like reference numerals may be used for like components.

In this document, expressions such as "has," "may have," "includes," or "may include" refer to the presence of a corresponding characteristic (eg, a numerical value, function, operation, or component such as a part). and does not exclude the presence of additional features.

In this document, expressions such as "A or B," "at least one of A and/and B," or "one or more of A or/and B" may include all possible combinations of the items listed together. . For example, "A or B," "at least one of A and B," or "at least one of A or B" means (1) includes at least one A, (2) includes at least one B; Or (3) it may refer to all cases including both at least one A and at least one B.

As used herein, expressions such as "first," "second," "first," or "second," may modify various elements, regardless of order and/or importance, and refer to one element. It is used only to distinguish it from other components, and does not limit the components. For example, the first user equipment and the second user equipment may represent different user equipment regardless of order or importance. For example, without departing from the scope of the rights described in this document, a first component may be referred to as a second component, and similarly, the second component may also be renamed as a first component.

One component (eg, a first component) is "coupled with/to (operatively or communicatively)" or "connected" to another component (eg, a second component) When referring to "connected to", it should be understood that the certain element may be directly connected to the other element or may be connected through another element (eg, a third element). On the other hand, when it is said that a component (eg, a first component) is "directly connected" or "directly connected" to another component (eg, a second component), the component and the It may be understood that other components (eg, a third component) do not exist between other components.

As used herein, the expression "configured to (or configured to)" depends on the context, for example, "suitable for," "having the capacity to ," "designed to," "adapted to," "made to," or "capable of." The term “configured (or configured to)” may not necessarily mean only “specifically designed to” in hardware. Instead, in some circumstances, the expression “a device configured to” may mean that the device is “capable of” with other devices or parts. For example, the phrase “a processor configured (or configured to perform) A, B, and C” refers to a dedicated processor (eg, an embedded processor) for performing the operations, or by executing one or more software programs stored in a memory device. , may mean a generic-purpose processor (eg, a CPU or an application processor) capable of performing corresponding operations.

Terms used in this document are only used to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by one of ordinary skill in the art described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted with the same or similar meaning to the meaning in the context of the related art, and unless explicitly defined in this document, ideal or excessively formal meanings is not interpreted as In some cases, even terms defined in this document cannot be construed to exclude embodiments of this document.

Various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims of the present invention, and these modifications are the technical spirit or spirit of the present invention. It should not be understood individually from the perspective.

According to an embodiment of the present invention, the build stage (1) providing a space in which the particulate material (M) is stacked; a print head (2) for applying a binder (B) to the laminated particulate material (M) on the upper part of the build stage (1); and planarization means for flattening the particulate material M stacked on the build stage 1; wherein the flattening means includes a heating means, and through the planarization means, the particulate material M is laminated and Provided is a binderjet 3D printing apparatus for flattening and curing the binder (B) applied to the particulate material (M) at the same time.

The build stage 1 provides a space in which the particulate material M feedstock is stacked, and the print head 2 provided on the build stage 1 is transported in a horizontal direction to the build stage 1 and stacked. A binder (B) is applied to the above-mentioned particulate material (M).

The flattening means may perform a function of compacting the particulate material (M) flat in a planar form horizontal to the ground. By repeating the operation of laminating the particulate material M in a planar form, it is possible to manufacture the output 0 having a three-dimensional shape.

The heating means may mean a member that directly transfers heat to the particulate material (M) in a conductive manner.

In addition, the flattening means includes: a roller 3 having a cylindrical shape having a predetermined diameter; Shafts 4 extending to both sides of the roller 3, respectively; a bearing 5 connected to the shaft 4 and fixing the shaft 4 in a direction perpendicular to the axial direction; and conveying means connected to the bearing (5) for conveying the roller (3) in a horizontal direction with respect to the laminated particulate material (M). The roller 3 may be configured to flatten the particulate material M by pressing and conveying the laminated particulate material M.

Shafts 4 respectively extended on both sides of the roller 3 serve as an axis of the flattening means and serve as passages through which the heating wire 8 and the wires of the temperature sensor 9 exit the shaft 4 . The wires of the heating wire 8 and the temperature sensor 9 may be collected inside the shaft 4 and wrapped with a single silicone tube to be connected to the control unit.

In addition, the flattening means is provided with a bearing 5 for supporting the shaft 4 to be transportable in the horizontal direction. Referring to FIG. 10 , the bearing 5 is made of a pair and is disposed on both sides of the roller 3 to support the roller 3 to be transportable.

And, a feed stage (6) provided within a predetermined distance from the build stage (1) to store the particulate material (M) to be supplied to the build stage (1); including; It may be configured to feed a portion of the particulate material M of the stage 6 to the build stage 1 .

When a horizontal feeding force is applied to the bearing 5, the roller 3 rotates with respect to the bearing 5 so that the surface of the roller 3 and the surface of the particulate material M contact, and the horizontally conveying roller ( The particulate materials M subjected to a horizontal force by 3) are supplied to the build stage 1 while being pushed from the feed stage 6 toward the build stage 1 . This state is shown in FIG. 7 .

In addition, the build stage (1) and the feed stage (6) is provided with a height adjustment means (7), respectively; to supply the particulate material (M) from the feed stage (6) to the build stage (1) Before, the height of the feed stage 6 is adjusted so that the surface of the particulate material M of the feed stage 6 is at a position higher than the surface of the particulate material M of the build stage 1, and the print head 2 Before applying the binder (B) at can be configured to

When the surface of the particulate material M of the feed stage 6 rises by a predetermined height from the build stage 1 through the height adjusting means 7, the roller 3 rotates with respect to the bearing 5 to rotate the feed stage ( 6) Push the particulate materials (M) therein to the build stage (1). The particulate materials (M) are laminated on the build stage (1) and the binder (B) is applied through the print head (2), and the build stage (1) is lowered by a predetermined height through the height adjusting means (7) to thereby produce fine particles. It may be configured to be additionally supplied with the material (M).

In addition, the heating means includes: a heating wire (8) accommodated inside the roller (3); and a temperature sensor 9 provided in the roller 3; may be configured to heat and maintain the temperature of the surface of the roller 3 within a set temperature range with the heat generated by the heating wire 8.

The heating wire 8 accommodated inside the roller 3 is configured to heat and maintain the roller 3 within a set temperature range through the temperature sensor 9, and is heated by the heat generated by the heating wire 8. The roller 3 pushes the particulate material M from the feed stage 6 to the build stage 1 and simultaneously cures the laminated binder B.

In the conventional printing method using an IR lamp, the particulate material (M) is transferred from the feed stage (6) to the build stage (1) using a roller (3), and the binder (B) is applied through the print head (2). After the IR lamp thermosets the laminated particulate material (M) and the binder (B) for a predetermined time, the present invention transfers the particulate material (M) from the feed stage (6) to the build stage (1) and at the same time By thermal curing in such a way that the heated roller 3 directly heats the laminated binder (B), there is no need to separately control the humidity of the build stage during curing, and it is possible to quickly produce prints without preheating the particulate material. can

And, the particulate material (M) is selected from the group comprising: sand, metal, polymer, ceramic, wood, cellulose, lactose, salt, carbon, hard material, glass, cement and gypsum, wherein the print head (2) Before the binder (B) is applied from the binder (B), it may be configured not to be coated with a material other than the binder (B).

In the conventional multilayer 3D printer, a two-component binder (B) is used in which the particulate material (M) is treated with a water-soluble binding agent (curing agent), etc. and then the binder (B) is applied again in the lamination step. It is possible to use the one-component binder (B) in which the binder (B) is applied only in the lamination step without any special treatment on the material (M).

In the two-component lamination method, reuse of the particulate material (M) becomes impossible because the particulate material (M) other than the part of the output (0) is hardened upon direct heating through the roller (3), but in the one-component lamination method, the particulate material (M) ), it is possible to reuse the particulate material (M) other than the output, so that it is possible to provide a more economical effect.

In addition, the binder (B): 26 to 41 wt% of silicate, 3 to 5 wt% of an additive, and 54 to 71 wt% of a solvent containing a humectant It may be composed of an inorganic binder. .

Also, 1) storing the particulate material (M) in the feed stage (6); 2) conveying the particulate material (M) from the feed stage (6) to the build stage (1) and flattening at the same time; 3) applying a binder (B) to the flattened particulate material (M) in the build stage according to the shape of the output (O); 4) flattening the particulate material (M) to which the binder (B) is applied again and curing the same; By repeating steps 2) to 4) to stack the particulate material (M), there is provided a binder jet 3D printing method for printing an output (O) of a three-dimensional shape.

More specifically, the feed stage 6 is raised by a predetermined height by the height adjusting means 7 so that the surface height of the particulate material M of the feed stage 6 is equal to that of the surface of the particulate material M of the build stage 1 . making it higher than the height by a predetermined height; The roller 3 is transferred from one side (or one end) of the feed stage 6 to one side (or the other end) of the build stage 1 , and the particulate material M is transferred to the build stage 1 by the roller 3 . pushing and feeding; applying a binder (B) through the print head (2) to the particulate material (M) further laminated on the build stage (1); The roller 3 is transferred from one side (or the other end) of the build stage 1 to one side (or one end) of the feed stage 6, and the particulate material M and the binder B through the heated roller 3 ) by direct heating to harden; and lowering the height of the build stage 1 by a predetermined height to additionally receive the particulate material M to prepare to stack a new particulate material M layer; may be repeatedly performed.

And, it provides a 3D printer output 0, which is output by any one of the binderjet 3D printing apparatus and the binderjet 3D printing method as described above.

Hereinafter, an embodiment of the binder (B) that can be used in the binder jet 3D printing apparatus according to an embodiment of the present invention will be described in detail.

According to an aspect of the present invention, an inorganic binder for 3D printing (B) comprising 26 to 41 wt% of silicate, 3 to 5 wt% of an additive, and 54 to 71 wt% of a solvent containing a humectant provides A 3DP mold having a strength of 5 MPa or more can be manufactured by controlling the ratio of a solvent including a raw material (silicate, additive) and a humectant.

Silicates include sodium silicate, calcium silicate, lithium silicate, potassium silicate, silicate sol, potassium metal silicate, and amorphous silicate. silicate), and may be at least one selected from the group consisting of colloidal silicate.

When the content of silicate is less than 26 wt%, it is not preferable because the 3DP mold produced does not have sufficient strength because the content of solid content is small, and when it exceeds 41 wt%, the viscosity of the binder (B) itself increases and it is impossible to secure discharge stability so it is not advisable

Additives include sodium hydroxide, sodium chloride, potassium chloride, sodium carbonate, potassium carbonate, potassium hydroxide, phosphate, sodium pyrophosphate ( It may be one or more selected from the group consisting of sodium pyrophosphate), calcium hydroxide, barium sulfate, amorphous phosphate, aminosaccharides, and magnesium carbonate. NaOH, NaCl, Na ₂ Co ₃ , and KOH reinforce the initial strength of the mold after curing, and phosphate reinforces the final strength of the product after curing. Preferably, a phosphoric acid series such as sodium hexametaphosphate may be added.

If the content of the additive is less than 3wt%, it is not preferable because it does not play a role of reinforcing strength in the binder (B), and if it exceeds 5wt%, the storage stability of the binder (B) cannot be secured.

A solution containing a humectant is Ethylene Glycol, Glycerol, Glycerin, Diethylene Glycol, 1,2-Hexanediol, 1,3-Pentanediol, 1,4-Butanediol, 1,5-Pentandiol, a group consisting of water It may be one or more selected from. A solvent containing a humectant may be mixed with the completely cooled binder (B) and used for 3DP.

When the content of the solvent containing the humectant is less than 54wt%, the viscosity of the binder (B) is high, so discharge stability cannot be secured. ) does not express sufficient strength due to low solid content.

It is preferable that the viscosity of the inorganic binder (B) according to the present invention is less than 3.7 cps, and the surface tension is less than 40 mN/m. By controlling the viscosity and surface tension, it is possible to secure the discharge stability of the binder (B).

According to another aspect of the present invention, the first step of preparing a solution in which the additive is dissolved; a second step of preparing a mixture by adding silicate to the solution; a third step of stirring the mixture at 50-100° C. for 30 minutes to 2 hours; A fourth step of cooling the stirred mixture and mixing it with a solvent containing a humectant; provides a method for manufacturing an inorganic binder (B) for 3D printing, including. The inorganic binder (B) prepared accordingly is characterized in that it is composed of 26 to 41 wt% of silicate, 3 to 5 wt% of additives, and 54 to 71 wt% of a solvent containing a humectant.

First, the additive is dissolved in DI water separately from the silicate. Then, the alkali silicate and the additive solution are mixed and stirred at 50 to 100° C. for 30 minutes to 2 hours. The stirring temperature and time can be controlled according to the composition ratio of the composition, and then, when the solution becomes transparent, the temperature is lowered and stirring is continued. After the stirred mixture is completely cooled, the binder (B) may be prepared by mixing it with a solvent containing a humectant.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. On the other hand, the illustration and detailed description of the configuration and the action and effect thereof, which can be easily known from those of ordinary skill in the art, will be simplified or omitted, and the parts related to the present invention will be described in detail.

binder synthesis

1 is a schematic diagram showing a method for manufacturing an inorganic binder (B) for 3D printing according to the present invention. Referring to FIG. 1 , the additive is dissolved in DI water separately from the alkali silicate. Then, the alkali silicate and the additive solution were mixed and stirred at 70° C. for 1 hour. When the solution became clear, the temperature was lowered and stirring was continued. A binder (B) was prepared by mixing the completely cooled solution with a solvent containing a humectant.

Discharge result

A 3DP binder (B) composition as shown in Table 1 (Examples 1 and 2, Comparative Examples 1 and 2) below was prepared and discharged by controlling the content of a solution containing silicate, an additive, and a humectant. 2 is a result of discharging using the binder (B) according to Example 1 of the present invention, FIG. 3 is a result according to Example 2, FIG. 4 is a result according to Comparative Example 1, and FIG. 5 is a result according to Comparative Example 2 This is the result picture.

alkali silicate
(wt%) additive
(wt%) humectant
solution containing
(wt%) Discharge result Example 1 41 5 54 possible Example 2 26 3 71 possible Comparative Example 1 24 2 73 impossible Comparative Example 2 45 8 47 impossible

Discharge stability

In order to check the discharge stability, the contents of the solvent and the raw material containing the humectant were adjusted. Table 2 below shows the viscosity and surface tension according to each composition ratio.

alkali silicate
(wt%) additive
(wt%) humectant
solution containing
(wt%) viscosity
(20℃,cps) surface tension
(20℃,mN/m) Example 3 31 4 65 3.84 45.9 Example 4 41 5 54 4.42 31.1 Example 5 26 3 71 2.85 45.4 Example 6 27 4 69 3.66 34.7

6 is a photograph showing the discharge results of Examples 3 to 6, respectively. (a) to (d) are the discharge results of Examples 3 to 6, respectively. Referring to FIG. 6 and Table 2, it was confirmed that in Examples 3 to 5, head clogging occurred, whereas in Example 6, discharge stability was ensured. Through this, it was confirmed that it is more preferable to maintain the conditions of a viscosity of less than 3.7 cps (20° C.) and a surface tension of less than 40 mN/m (20° C.).

strength of the mold

A mold was manufactured using the binder (B) according to the present invention, and the strength thereof was measured. Table 3 below shows the strength of the mold using the binder (B) prepared according to each composition ratio.

alkali silicate
(wt%) additive
(wt%) humectant
solution containing
(wt%) viscosity
(20℃,cps) surface tension
(20℃,mN/m) burglar
(MPa) mold 1 27 4 69 2.82 36.4 5 mold 2 31 5 63 3.47 33.3 3

Referring to Table 3, in order to secure the strength of 5 Mpa or more, it was confirmed that it is preferable to secure the strength by controlling the ratio of the solvent containing the humectant to the raw material to 54 to 71 wt%.

M: Powdered Raw Material
O: Output
B : Binder
1: Build Stage
2: Inkjet Print Head
3: roller
4: shaft
5: Bearing
6: Feed Stage
7: height adjustment means
8: hot wire
9: temperature sensor

Claims (9)

a build stage providing a space in which the particulate material is deposited;
a print head on the top of the build stage for applying a binder to the laminated particulate material; and
a planarizing means for planarizing the particulate material stacked on the build stage;
The planarization means includes:
a roller configured in a cylindrical shape having a predetermined diameter; and
A heating means for heating the roller is provided;
The particulate material comprises:
It is selected from the group comprising sand, metal, polymer, ceramic, wood, cellulose, lactose, salt, carbon, hard material, glass, cement and gypsum,
Before the binder is applied from the print head, a one-component binder that is not coated with a material other than the binder is applied,
The binder is:
26-41 wt% of silicate, 3-5 wt% of an additive, and 54-71 wt% of a solvent comprising a humectant,
The viscosity is less than 3.7 cps, and the surface tension is adjusted to be less than 40 mN/m,
A binder jet 3D printing apparatus for laminating and planarizing the particulate material and curing the binder applied to the particulate material through the planarization means The method according to claim 1,
The planarization means includes:
Shafts each extending to both sides of the roller;
a bearing connected to the shaft and fixing the shaft in a direction perpendicular to the axial direction; and
a conveying means connected to the bearing and conveying the roller in a horizontal direction with respect to the laminated particulate material; and
The binder jet 3D printing apparatus, wherein the roller flattens the particulate material by pressing and conveying the laminated particulate material 3. The method of claim 2,
A feed stage provided within a predetermined distance from the build stage to store the particulate material to be supplied to the build stage; including,
A binderjet 3D printing apparatus that supplies a part of the particulate material of the feed stage to the build stage by transferring the roller 4. The method of claim 3,
Including; height adjustment means respectively provided on the build stage and the feed stage
Before feeding the particulate material from the feed stage to the build stage, adjusting the height of the feed stage so that the particulate material surface of the feed stage is higher than the particulate material surface of the build stage;
Before applying the binder in the print head, the binderjet 3D printing apparatus for adjusting the height of the build stage so that the distance between the print head from the particulate material surface of the build stage is maintained within a predetermined range, 3. The method of claim 2,
The heating means includes:
a heating wire accommodated inside the roller; and
Including; a temperature sensor provided on the roller
A binderjet 3D printing apparatus that heats and maintains the temperature of the surface of the roller within a set temperature range with the heat generated by the heating wire delete delete As a printing method using the binder jet 3D printing apparatus according to claim 1,
1) storing particulate material in a feed stage;
2) conveying the particulate material from the feed stage to the build stage and simultaneously planarizing;
3) applying a binder to the flattened particulate material in the build stage according to the shape of the output;
4) flattening the particulate material to which the binder is applied again, and simultaneously curing;
A binderjet 3D printing method for printing a three-dimensional shape output by repeating steps 2) to 4) to stack a particulate material Claims 1 to 5, 3D printer output output by any one of the binder jet 3D printing apparatus of any one of claims 1 to 5 and the binder jet 3D printing method of claim 8

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