WO2016021869A1

WO2016021869A1 - Head assembly and system of three-dimensional modeling device using belt-type modeling material feeding module and wire mesh, and three-dimensional modeling method using same

Info

Publication number: WO2016021869A1
Application number: PCT/KR2015/007931
Authority: WO
Inventors: 김승택; 김종석; 강희석; 강경태; 김형태; 박문수
Original assignee: 한국생산기술연구원
Priority date: 2014-08-04
Filing date: 2015-07-29
Publication date: 2016-02-11
Also published as: KR101599727B1; KR20160017783A

Abstract

The present invention relates to a 3D modeling device and a 3D modeling system using the same, and provides a three-dimensional modeling device comprising: a belt-type modeling material feeding module (10) including a modeling material feeding part (12) for feeding modeling material particles charged with a predetermined electric charge, and a modeling belt (11) traveling by forming an endless track and has, on the outer side of the track, a modeling preparation layer (2)formed by the modeling material particles received from the modeling material feeding part (12); a wire mesh (20) performing a function of selectively isolating, from the modeling belt (11), modeling layer particles (3) from the modeling preparation layer (2) while positioned at the lower part of the modeling belt (11), and provided with a plurality of mesh cells; a first electrification device (30) for providing a first voltage to a surface of the modeling belt (11) and providing a second voltage, among the mesh cells, to one or more pressing mesh cells (24) corresponding to the modeling layer particles (3); a modeling stage module (40) positioned at the lower part of the wire mesh (20), and including a modeling stage (41) on which the modeling layer particles (3), which are isolated from the modeling belt (11), are mounted after passing through openings of the pressing mesh cells (24); and a light source module (50) for melting or sintering the modeling layer particles (3) so as to form a modeling layer, wherein the isolation of the modeling layer particles (3) from the modeling belt (11) is caused by an electric field formed between the modeling belt (11) and the pressing mesh cells (24) by the first voltage and the second voltage.

Description

Head assembly and system of three-dimensional molding apparatus using belt-type molding material feeding module and wire mesh and three-dimensional molding method using the same

The present invention relates to a 3D molding apparatus and a 3D molding system using the same, and more particularly, a belt-shaped molding material feeding module and a wire mesh are configured to allow surface-molding to increase the molding speed, and to three-dimensional molding. It provides a 3D molding apparatus and system, and a three-dimensional molding method using the same to increase the vertical and horizontal resolution of.

3D printing is one of the methods of manufacturing a product, and since it uses a lamination method, it has been mainly used for prototyping because the loss of materials is small and relatively low manufacturing cost is required as compared with the conventional cutting process. Recently, technology in this field has been recognized as a next-generation production technology beyond prototyping.Increasing production speed, increasing the completeness of the output (resolution), increasing the available materials, and miniaturizing the device can be used by individuals. This is because accessibility has increased.

As the method of 3D printing, there are largely methods such as Stereo Lithography Apparatus (SLA), Selective Laser Sintering (SLS), and Fused Deposition Modeling (FDM).

US Patent No. 7074029 (invention name: Accumulation, control and accounting of fluid by-product from a solid deposition modeling process, hereinafter referred to as prior art 1) at least one molding material container carrying a molding material, Means for separating an intermittent amount of molding material from the molding material container, a means for moving the separated molding material to the dispenser, a dispenser for dispensing the molding material onto the platform in layers for molding, and for removing excess molding material. Disclosed is a molding material supply apparatus comprising a means.

Since the prior art 1 adopts a typical SLS type three-dimensional molding method, it is based on the line-forming that is hardened or sintered by scanning a complex path using a light source such as a laser after the molding preparation step such as flattening. There is a problem that the molding time is long. In addition, the post-treatment process such as removal of the uncured portion of the three-dimensional molding method of the SLS method is inevitable, so that the total process steps are increased and the total molding time is increased. In addition, since one molding layer can be formed only in a single color, there is a disadvantage that multicolor molding is difficult.

The present invention includes a head assembly of a three-dimensional molding apparatus including a belt-type molding material feeding module including a molding material supply unit and a molding belt, a wire mesh having a plurality of mesh cells, and a first charging device for applying a voltage. The present invention provides a three-dimensional molding apparatus comprising a head assembly, a molding stage module, and a light source module of a three-dimensional molding apparatus. In addition, a three-dimensional molding system including a three-dimensional molding apparatus and a control module and a three-dimensional molding method using the same are proposed. Accordingly, the molding speed can be increased, post-processing can be omitted, color molding can be easily performed, and the structure of the apparatus can be simplified.

The present invention provides a first effect that the molding speed can be increased by using a surface-based molding method, and a post process can be omitted by selecting and forming only a portion to be molded using a wire mesh. Effect, the third effect that color shaping can be easily performed, and the fourth effect of simplifying the structure of the apparatus can be simplified by using the belt-shaped molding material feeding module to omit complicated components for flattening.

In relation to the first effect, the present invention prepares the materials forming a molding layer at the surface level, and the process of sintering and hardening is also performed on a surface basis, such as using a line laser, it is possible to significantly shorten the molding time .

In relation to the second effect, the present invention provides a procedure such as further removing uncured portions, unlike conventional SLS or SLA three-dimensional molding, by selecting and removing unnecessary portions before the sinter hardening step. By omitting, the process step can be reduced and the total molding time can be shortened.

In relation to the third effect, while the conventional methods had to mold only one color for one molding layer, the present invention forms one molding layer by combining a portion corresponding to a plurality of colors, and once Since the surface-forming method can be applied, the color molding can be easily performed.

1 is a perspective view showing an embodiment of a belt-shaped molding material feeding module of the three-dimensional molding apparatus of the present invention.

Figure 2 is a perspective view showing one embodiment of a belt-shaped molding material feeding module of the three-dimensional molding apparatus of the present invention.

Figure 3 is a schematic diagram showing the configuration of an embodiment of a three-dimensional molding apparatus of the present invention.

Figure 4 is a schematic diagram showing the configuration of one embodiment of a three-dimensional molding apparatus of the present invention.

Figure 5 is a schematic diagram showing an embodiment of a wire mesh of the three-dimensional molding apparatus of the present invention.

Figure 6 is a block diagram illustrating a control module of the three-dimensional molding system of the present invention.

In order to achieve the above technical problem, in order to form the molding layer of the present invention, in the head assembly of the three-dimensional molding apparatus for selectively seating the molding material particles on the molding stage, the molding material particles charged with a predetermined charge are supplied. A modeling material feeding module comprising: a modeling belt, a modeling belt having a modeling preparation layer formed of the modeling material particles supplied from the modeling material supply part on an outer surface of the modeling material supply part and traveling in an endless track; A wire mesh having a plurality of mesh cells, and having a function of separating the molding layer object particles from the molding preparation layer selectively from the molding belt while being positioned below the first surface on the surface of the molding belt. One or more voltages are applied and corresponding to the modeling layer target particles in the mesh cells. And a first charging device for imparting a second voltage to the pressurized mesh cell, wherein the separation of the molding layer target particles from the molding belt is performed by the first voltage and the second voltage. Characterized by the electric field formed between the pressurized mesh cells.

The absolute value of the first voltage of the head assembly of the three-dimensional molding apparatus of the present invention may be smaller than the absolute value of the second voltage.

In addition, the first voltage and the second voltage of the head assembly of the three-dimensional molding apparatus of the present invention is greater than the first electrostatic force acting between the molding belt and the molding layer target particles, the molding belt and the pressurized mesh cell. The second electrostatic force applied to the modeling layer target particle by the electric field acting between and may be characterized in that each is determined to be larger.

In addition, the wire mesh of the head assembly of the three-dimensional molding apparatus of the present invention, the first conductive wire array (wire array) arranged in parallel with each other in one direction at a predetermined interval, and the first conductive wire at a predetermined interval It may be characterized in that it comprises a second conductive wire array arranged in parallel to each other in a direction perpendicular to the array.

In addition, applying the second voltage to the pressurized mesh cell of the head assembly of the three-dimensional molding apparatus of the present invention surrounds the pressurized mesh cell among the conductive wires constituting the first conductive wire array and the second conductive wire array. The second voltage may be applied to all four conductive wires to be formed.

In addition, the first conductive wire array and the second conductive wire array of the head assembly of the three-dimensional molding apparatus of the present invention may be characterized in that each made of a metal material.

In addition, the modeling material supply unit of the head assembly of the three-dimensional molding apparatus of the present invention may be characterized in that it comprises two or more color-specific molding material supply unit to supply the molding material particles of two or more colors.

In addition, the belt-shaped molding material feeding module of the head assembly of the three-dimensional molding apparatus of the present invention, characterized in that it further comprises a molding material leveling unit having a function of flattening the molding material particles supplied to the molding belt to a predetermined thickness. You can do

The belt-shaped molding material feeding module of the head assembly of the three-dimensional molding apparatus of the present invention removes the molding material particles remaining on the molding belt after the molding layer object particles are separated from the molding belt by the wire mesh. And it may be characterized in that it further comprises a molding material removal unit for collecting.

In addition, the modeling material supply unit of the head assembly of the three-dimensional molding apparatus of the present invention may be characterized in that it further comprises a second charging device for receiving chargeable molding material particles to charge with a predetermined charge.

In addition, the head assembly and system of the three-dimensional molding apparatus using the belt-shaped molding material molding module and the wire mesh of the present invention and the three-dimensional molding method using the same are located below the wire mesh, the target particles separated from the molding belt Proposes a three-dimensional shaping device comprising a shaping stage module comprising a shaping stage that passes through the opening of the pressurized mesh cell, and a light source module for melting or sintering the shaping target particles to form the shaping layer. do.

In addition, the light source module of the three-dimensional molding apparatus of the present invention may be characterized in that the line laser (line laser).

In addition, the head assembly and system of the three-dimensional molding apparatus using the belt-shaped molding material molding module and the wire mesh of the present invention and the three-dimensional molding method using the same, the belt-shaped molding material feeding module, the first charging device, the molding stage module and It proposes a three-dimensional shaping system comprising a control module for controlling the driving of the light source module.

In addition, in the method for molding a three-dimensional object by using the three-dimensional molding system of the present invention, (i) the molding material particles supplied by the molding material supply unit is flattened, and the molding belt is applied by applying the first voltage to the molding belt. Forming a mold preparation layer on the outer surface of the belt; (ii) driving the mold belt to position the mold preparation layer above the wire mesh; and (iii) at least one selected by the control module. Applying the second voltage to the pressurized mesh cell to pass the molding layer object particles separated from the forming belt through the opening of the pressurized mesh cell, and then seating on the surface of the molding stage or immediately before the forming layer, (iv) In step (iii), the light source module irradiates modeling light rays to the modeling layer target particles seated on the modeling stage or immediately before the modeling layer surface. Forming a mold layer, (v) moving the molding stage downward by the thickness of the molding layer, and (vi) repeating the steps (i) to (v) until the shape of the three-dimensional object is completed. We propose a three-dimensional molding method using a three-dimensional molding system comprising a step of performing.

In addition, in the method of molding a three-dimensional object by using the three-dimensional molding system of the present invention, (a) the molding material particles supplied by the molding material supply unit is flattened, and the molding belt is applied by applying the first voltage to the molding belt. Forming a mold preparation layer on the outer surface of the belt; (b) driving the mold belt to position the mold preparation layer above the wire mesh; and (c) at least one selected by the control module. Applying the second voltage to the pressurized mesh cell to pass the molding layer object particles separated from the forming belt through the opening of the pressurized mesh cell, (d) opening the pressurized mesh cell in step (c) Irradiating molding rays to the modeling layer object particles that have passed, melting or sintering the modeling layer object particles, (e) the modeling molten or sintered in the step (d) (B) moving the molding stage downward by the thickness of the molding layer; and (g) until the shape of the three-dimensional object is completed. We propose a three-dimensional molding method using a three-dimensional molding system comprising the steps of repeating the step) to (f).

In addition, in the method for color molding a three-dimensional object using the three-dimensional molding system of the present invention, (a) determining the colors to apply, (b) corresponding to one of the colors determined in the (a) step Forming material particles supplied by the color-specific modeling material supply unit is flattened, and applying a first voltage to the modeling belt to form a modeling preparation layer on the outer surface of the modeling belt, (c) running the modeling belt Placing the molding preparation layer above the wire mesh, (d) applying the second voltage to at least one pressurized mesh cell selected by the control module, thereby removing the molding layer target particles from the molding belt. After passing through the opening of the pressurized mesh cell, the step of seating on the surface of the molding stage or the previous molding layer, (ㅁ) step (b) to (d) Repeating for all the colors determined in the step (a), (iii) the modeling layer by irradiating a modeling ray to the modeling layer target particles seated on the modeling stage or the previous modeling layer surface; Forming step, (g) moving the molding stage downward by the thickness of the molding layer, (o) repeating steps (b) to (g) until the shape of the three-dimensional object is completed. We propose a three-dimensional color molding method using a three-dimensional molding system comprising a step.

First, the meaning of the terms used in the description of the present invention will be determined. The molding layer is an element forming a three-dimensional object by being stacked. The modeling preparation layer 2 is a layer made of modeling material particles which is planarized on the modeling belt 11. The modeling layer target particles 3 are actually separated from the modeling preparation layer 2 to form the modeling layer.

The head assembly of the three-dimensional molding apparatus of the present invention has a function of selectively seating the molding material particles on the molding stage to form the molding layer, and receives the molding material to form and transport the molding preparation layer (2). The main components include a belt-shaped molding material feeding module 10, a first charging device 30 and a wire mesh 20 for separating and detaching the molding layer target particles 3 from the formed molding preparation layer 2. .

From the viewpoint of the molding material particles, the molding material particles are supplied from the molding material supply part 12 and planarized on the molding belt 11 to form the molding preparation layer 2, wherein the molding belt 11 has a predetermined voltage. As a result, charged molding material particles adhere to the surface of the molding belt 11 by electrostatic force. Thereafter, the molding preparation layer 2 is positioned above the wire mesh 20 by traveling of the molding belt 11, and in particular, the separation from the molding belt 11 of the molding layer target particle 3 is performed by the first charging device. 30 is performed by applying a predetermined voltage to the pressurized mesh cell 24. The molding layer target particle 3 passes through the opening of the pressurized mesh cell 24 and is seated on the molding stage 41.

The electrical mechanism used in the present invention is described. First, the molding material particles are supplied in a state of being charged with a predetermined charge, and the polarity of such charges is positive and negative, and the amount of charge per particle will vary depending on the type of molding material used. In addition, the molding belt 11 applies a voltage having a polarity opposite to that of the molding material particles. For example, if the molding material particles are charged with a positive charge, the molding belt 11 is subjected to a negative voltage, whereby the molding material particles are attached to the surface of the molding belt 11 by electrostatic force. do. In particular, if the magnitude of the voltage-first voltage- applied to the molding belt 11 and the amount of charge of the molding material particles are appropriately selected, the electrostatic force-first electrostatic force between the molding belt 11 and the molding material particles is applied to the molding material particles. It becomes larger than the gravity acting, so that the molding preparation layer 2 formed on the molding belt 11 does not escape even in a situation in which it is inverted in the air.

In order for the head assembly of the three-dimensional molding apparatus of the present invention to perform a function in a predetermined manner, the following first voltage and second voltage should be set according to the following three conditions.

First, the absolute value of the first voltage must be smaller than the absolute value of the second voltage (first condition). The wire mesh 20 composed of a mesh cell having a predetermined shape, preferably a square, performs a function of separating the molding layer target particles 3 from the molding preparation layer 2, which separation pressurized mesh cells. (24)-corresponding to the forming layer target particles (3) of the mesh cell-and by the electric field formed between the molding belt 11, the generation of this electric field is a second voltage applied to the pressurized mesh cell (24) And the first voltage applied to the molding belt 11. For example, when the molding material particles are charged with negative charge, both the first voltage and the second voltage should be positive voltages, and the absolute value of the second voltage should be set to be greater than the absolute value of the first voltage. In this case, the electric field formed between the pressurized mesh cell 24 and the molding belt 11 is formed in a direction from the pressurized mesh cell 24 toward the molding belt 11, and since the molding material particles bear negative charge, The electrostatic force-the second electrostatic force-that the molding material particles constituting the molding preparation layer 2 receive by the electric field acts in the direction from the molding belt 11 to the pressurized mesh cell 24. On the contrary, when the molding material particles are charged with positive charges, both the first voltage and the second voltage should be negative voltages, and the absolute value of the second voltage should be set to be greater than the absolute value of the first voltage. In this case, the electric field formed between the pressurized mesh cell 24 and the molding belt 11 is formed in the direction from the molding belt 11 to the pressurized mesh cell 24. Since the molding material particles have a positive charge, The electrostatic force-the second electrostatic force-that the molding material particles constituting the molding preparation layer 2 receive by the electric field acts in the direction from the molding belt 11 to the pressurized mesh cell 24. In conclusion, by setting the absolute value of the first voltage to be smaller than the absolute value of the second voltage, the second electrostatic force is directed from the modeling belt 11 to the pressurized mesh cell 24 regardless of the charge polarity of the modeling material particles. To act in a direction.

Second, the first voltage and the second voltage, between the molding belt 11 and the pressurized mesh cell 24 than the first electrostatic force acting between the molding belt 11 and the molding layer target particle (3). The second electrostatic force exerted on the modeling layer target particles 3 by the acting electric field must be determined respectively (second condition). This is due to the fact that the directions of the first electrostatic force and the second electrostatic force acting on the modeling layer target particle 3 are opposite to each other.

Third, in the case of applying the wire mesh 20 having the same shape as in the exemplary embodiment illustrated in FIGS. 3 to 5, additional conditions must be implemented, which is also adjusted through the above-described adjustment of the first voltage and the second voltage value. Implement (the third condition). Specifically, the second electrostatic force due to the electric field formed in the pressurized mesh cell 24 should separate only the modeling layer target particles 3 located vertically above the pressurized mesh cell 24, and do not separate the particles outside the region. Can not be done. In addition, the electrostatic force generated by the electric field formed by the mesh cell (made up of three or less pressurized enclosing wires) rather than the pressurized mesh cell 24 should not separate particles on the mold preparation layer 2 located immediately above.

The molding material used in the present invention is a particle of powder (powder) property. The molding material may be a polymer resin powder or a powder of a metal, the determination of which should be made in relation to the wavelength band of the light source for melting or sintering, in particular a laser, to be described later. In addition, since the molding material particles are charged and used with a predetermined electric charge, the electrostatic force can be used in the formation of the molding preparation layer 2 and the separation process of the molding layer target particles 3 as described later.

Hereinafter, the head assembly of the three-dimensional molding apparatus of the present invention will be described for each component.

The belt-shaped molding material feeding module 10 includes a molding material supply unit 12 and a molding belt 11.

The molding material supply unit 12 forms the molding belt as much as necessary to form the molding preparation layer 2 having a first function of receiving and storing the molding material particles from the outside, and having a predetermined area and a predetermined thickness. A second function for discharging onto (11) and a third function for flattening while discharging the molding material can be selectively performed. In connection with the second function, in order to facilitate the discharge to the outside, the molding material supply unit 12 is a vibration means, a screw for mechanically conveying the powder, a grinding machine for preventing the molding material from agglomeration, a grinder Or a stirrer or the like. In relation to the third function, it can be realized by mounting a flattening blade in the adjacent portion of the molding material discharging nozzle, or by using the molding material discharging nozzle almost in close contact with the molding belt 11, Likewise, a separate molding material leveling part 14 may be provided that is separated from the molding material supply part 12.

In supplying the molding material particles charged with a predetermined charge, a second charge is provided in the molding material supply part 12 by supplying the charged material from the outside, or by receiving the charged particles that are not yet charged. It can also be configured to be charged by the device. Such a second charging device should have a charging function corresponding to it depending on whether the particles used are a polymer resin or a metal, and various known methods can be used. In addition, the molding material supply unit 12 may include two or more color-specific molding material supply unit 13 to supply the molding material particles of two or more colors for color molding. This color molding will be described later.

The molding belt 11 performs a first function of traveling in an endless track, and a second function of forming a molding preparation layer 2 from the molding material particles supplied from the molding material supply part 12 on the outer surface of the track. . In relation to the first function, the caterpillar formed by the molding belt 11 should have at least two flat surfaces of a predetermined area as in the embodiment shown in FIG. 1, which is a three-dimensional modeling of the present invention. This is due to the fact that the apparatus is for face-shaping—to mold one shaping layer at a time—the predetermined area should be at least the maximum possible area of the shaping layer. The traveling speed of the molding belt 11 is appropriate for each of the forming preparation layer 2, the transfer of the forming preparation layer 2 above the wire mesh 20, and the removal of the remaining molding material particles. Since it should be able to be controlled, in consideration of this configuration of the drive of the molding belt (11). Thus, one embodiment of the driving unit may include a servo motor that can change the rotational speed according to the control drive signal from the control module 60 to be described later, but is not limited thereto. In addition, the molding belt 11 should be provided with an electrode that can be charged (charged) to a predetermined potential in order for the molding material particles to adhere to the surface thereof. Specifically, the electrode is the first charging device 30 to be described later. The voltage generated through) is applied to the surface of the molding belt (11).

The belt molding material feeding module 10 may further include a molding material leveling unit 14 having a function of flattening molding material particles supplied to the molding belt 11 to a predetermined thickness. In one embodiment of the invention shown in 1, a configuration having a blade shape is shown. Here, the blade is planarized with respect to the particle layer temporarily supplied from the molding material supply unit 12, and the separation distance between the tip of the blade and the outer surface of the molding belt 11 tracks the thickness of the molding preparation layer 2 do. When the thickness of the molding preparation layer 2 becomes thinner-for example, when the average diameter value of the particles-is increased, the vertical resolution of the three-dimensional modeling can be increased, so that the molding material leveling unit 14 and the molding belt 11 have an orbital outer surface. Determine the separation distance.

In addition, the belt-shaped molding material feeding module 10 is a molding material particles remaining on the molding belt 11 after the molding layer target particles 3 are separated from the molding belt 11 by the wire mesh 20 to be described later. It may be to further include a molding material removal unit 15 to remove and collect. After the forming layer target particles 3 are separated to form the forming layer, a process of forming a new forming preparation layer 2 on the surface from which the remaining forming material particles are removed is required. In one embodiment, the molding material removal portion 15 having a blade shape is shown. At this time, the tip of the blade should be installed so that the separation distance with the molding belt 11 is smaller than the minimum diameter of the molding material particles forming the molding preparation layer (2) to completely remove the residual molding material particles. However, when the separation distance is set to 0, it is considered that if the manufacturing error exists and the surface of the molding material removal unit 15 and the molding belt 11 interfere with each other, wear may occur. In addition, the molding material particles removed by the molding material removing unit 15 need to be collected for recycling, and as an example of the configuration for the collection, the molding material below the molding material removing unit 15 It is possible to consider collecting the molding material particles separated from the molding belt 11 by the molding material removing unit 15 by placing a collecting unit-for example, a tray. The configuration for resupplying to the molding material supply unit 12 may be further considered.

The wire mesh is positioned below the molding belt 11 and has a function of selectively detaching the molding layer target particles 3 from the molding belt 2 from the molding belt 11. The wire mesh 20 is basically formed to have a plurality of mesh cells, and configured to apply voltage to each mesh cell independently, but easily pressurizing means to each mesh cell. To implement, it can be preferably configured as in the embodiment shown in Figs. That is, the first conductive wire array 21 has a predetermined interval (first interval) and is arranged parallel to each other in one direction and perpendicular to the first conductive wire array 21 at a predetermined interval (second interval). It is manufactured by including a second conductive wire array 22 arranged in parallel to each other in one direction, in which case, the first conductive wire array 21 and the second conductive wire array 22 is formed to cross the mesh cell The shape of becomes rectangular. In particular, in the case where the first interval and the second interval are the same, the shape of the mesh cell becomes a square, so that the molding resolution in the vertical and horizontal directions with respect to one molding layer becomes more preferable. The values of the first interval and the second interval are directly connected to the horizontal resolution of the three-dimensional molding apparatus of the present invention, and the smaller the values, the higher the horizontal resolution to form a precise three-dimensional sculpture. In addition, with respect to the total area of the wire mesh 20, the ratio (opening ratio) of the area occupied by the entire opening is to be taken into account, which means that each wire constituting the wire mesh 20 itself is a modeling layer target particle 3. This is because it may act as an interference factor in the process of passing through the wire mesh 20. When the first interval and the second interval are narrowed, the horizontal resolution is increased, but the aperture ratio is lowered, so that the molding layer object particles 3 interfere with the wires during movement, and a molding error is increased. When the two intervals are widened, the horizontal resolution is somewhat lowered, but the aperture ratio is increased, and it is considered that there is an advantage that the possibility of occurrence of the molding error as described above is lowered.

The application of the above-mentioned second voltage to the pressurized mesh cell 24-corresponding to the shaping layer target particle 3 among the mesh cells-is the first conductive wire array 21 and the second conductive wire array 22. The second voltage is applied to all four conductive wires formed by surrounding the pressurized mesh cell 24 among the conductive wires. As a result, an electric field is formed over the entire inner region of the closed plane-square-square of the pressurized mesh cell 24, and further, the electric field formed in another mesh cell subjected to the second voltage only to three or less of the surrounding wires. An electric field with a value greater than that is formed.

The first conductive wire array 21 and the second conductive wire array 22 should not be in contact with each other, but in order to form the direction of the electric field formed when applying a voltage to the pressurized mesh cell 24 in the direction of gravity as much as possible, The first conductive wire array 21 and the second conductive wire array 22 should be spaced apart from each other by a minimum distance. For this purpose, the first conductive wire array 21 and the second conductive wire array 22 may be formed of a non-conductive adhesive. It can be considered to adhere to each other by using. In addition, the first conductive wire array 21 and the second conductive wire array 22 is a material having excellent conductivity, regardless of the material, but considering the strength and rigidity, preferably made of metal, stainless steel More preferably, it is made of steel (SUS), inva steel, tungsten, copper and alloys thereof.

In addition, the wire mesh 20 is preferably installed at intervals of several hundred micrometers to several millimeters with respect to the outer surface of the orbit of the molding belt 11, which is the molding layer target particles (3) to the molding belt (11) This is to prevent molding errors by passing through the pressurized mesh cell 24 which is exactly vertically downward after being separated from the mold.

The first charging device 30 applies a first voltage to the surface of the molding belt 11 and applies a second voltage to at least one pressurized mesh cell 24 corresponding to the molding layer target particles 3 of the mesh cells. It has a function to impart and can be configured with a known charging device such as a corona type charger. The first charging device 30 should be provided with an interface capable of precisely pressing each wire constituting the wire mesh 20.

Next, the three-dimensional molding apparatus of the present invention will be described. The three-dimensional molding apparatus further includes a molding stage module 40 and a light source module 50 in the head assembly of the three-dimensional molding apparatus described above.

The molding stage module 40 is positioned below the wire mesh 20, and the molding layer target particles 3 separated from the molding belt 11 pass through the openings of the pressurized mesh cell 24 and are seated. It comprises a stage 41 and a molding stage driving unit for driving such a molding stage (41). The molding stage 41 is an element in which the three-dimensional sculpture starts to be molded thereon, and the three-dimensional sculpture is attached thereon during the molding process and after the molding is finished. Therefore, the upper surface of the molding stage 41 should be treated with a material capable of maintaining adhesion to a certain degree before and after the molding material located thereon is melted or sintered by the molding beam. Moreover, it should be noted that the quality of the three-dimensional sculpture is ensured when the molding is not separated from the molding stage 41 in spite of the vibration and shock generated when the molding stage 41 moves up and down in the molding process. The molding stage driving unit functions to move the above-described molding stage 41 in the up and down direction, and is composed of elements capable of transmitting power to the molding stage 41. As one embodiment of the present invention, a bar-type power transmission member that causes an up-and-down displacement of an external power source such as a servo motor and the molding stage 41 may be applied. However, the present invention is not limited thereto. Mechanical configuration may be considered. However, when a high-resolution molding work is planned such that the thickness of one molding layer is set from tens to hundreds of micrometers, the scale of the vertical displacement of the molding stage 41 should also be determined in such a range. The precision of the element should also be chosen. In addition, the molding stage 41 is also preferably spaced apart at intervals of several hundred micrometers to several millimeters with respect to the surface of the wire mesh 20, which is the molding layer target particles (3) to pressurize the wire mesh 20 After passing through the mesh cell 24, the molding stage 41 is to be seated in the vertical down exactly to prevent the molding error.

The light source module 50 functions to melt or sinter the modeling layer target particles 3 to form the modeling layer. The light source to be used should be selected according to the modeling material. Depending on whether the modeling material is a polymer resin particle or a metal particle, an LED, a laser, or a bulb capable of irradiating light in a wavelength band capable of melting or sintering them Etc. are used. However, the energy density of the laser should be carefully controlled so that the shaping ray does not affect the shaping completed layer of the already sintered lower layer. Furthermore, in the form of shaping rays, in view of the fact that the particle shaping apparatus of the present invention enables surface shaping, shaping rays are line lasered so that the shaping layer target particles 3 can also be melted or sintered in the plane dimension. If it is a (line laser), it is preferable at the point which can raise the molding speed. The line laser 50 may be implemented by mounting a special lens on the front surface of a light emitting part of a general laser.

Next, the three-dimensional molding system of the present invention, the three-dimensional molding apparatus of the present invention described above and comprises a control module 60 for interlocking control between each component of the three-dimensional molding apparatus. The main function of the control module 60 is to determine which mesh cell is the pressurized mesh cell 24 from the shape information of the input molding layer, and generate the drive control signal of the first charging device 30. Drive control signal for each part for driving, stopping or moving the molding belt 11, operating or stopping the molding material supply unit 12, vertical movement of the molding stage 41, turning the light source module 50 on and off, and the like. To generate a function, each of these must be performed in conjunction with each other based on the molding layer forming cycle, of course. In particular, when a plurality of pressurized mesh cells 24 are selected to form one molding layer, a method of controlling these pressurized mesh cells 24 is problematic. As an embodiment of such a control method, all applicable A method of pressurizing the pressure mesh cell 24 at the same time may be employed, but is not limited thereto. In this regard it is shown in FIG. 5. Specific implementation of the plurality of such control modules 60 may be performed by a circuit or a combination of software and circuit.

Next, the three-dimensional shaping method using the three-dimensional shaping system of the present invention described above will be described. As a first embodiment, first, the modeling material particles supplied by the modeling material supply unit 12 are flattened, and a modeling preparation layer is formed on the outer surface of the modeling belt 11 by applying a first voltage to the modeling belt 11. (2) is formed. Second, the molding belt 11 is driven to position the molding preparation layer 2 above the wire mesh 20. As described above, since the molding preparation layer 2 is in close contact with the molding belt 11 by the first voltage, gravity is not separated from the molding belt 11 only by gravity. Third, the molding layer target particles 3 which are separated from the molding belt 11 by applying a second voltage to at least one pressurized mesh cell 24 selected by the control module 60 open the opening of the pressurized mesh cell 24. After passing, it rests on the molding stage 41 or immediately before the molding layer surface. Fourth, the light source module 50 irradiates shaping rays to the shaping layer target particles 3 seated on the shaping stage 41 or the immediately preceding shaping layer surface to form shaping layers. As described above, when the shaping ray is generated by the line laser 50, the melting or sintering process may also be performed in the plane dimension, thereby increasing the shaping speed. Fifth, the molding stage 41 moves downward by the thickness of the molding layer. Sixth, the first to fifth steps described above are repeatedly performed until the shape of the three-dimensional object is completed.

In addition, a second embodiment of the three-dimensional molding method using the three-dimensional molding system of the present invention will be described. First, the modeling material particles supplied by the modeling material supply unit 12 are flattened, and a modeling preparation layer 2 is formed on the outer surface of the modeling belt 11 by applying a first voltage to the modeling belt 11. . Second, the molding belt 11 is driven to position the molding preparation layer 2 above the wire mesh 20. Third, the molding layer object particle (2) is applied from the molding belt 11 by applying a second voltage to at least one pressurized mesh cell 24 selected by the control module 60, and passes through the opening of the pressurized mesh cell 24 ( 3) is irradiated with shaping rays to melt or sinter the shaping target particles 3. Fourth, the molten or sintered molding layer target particles 3 are seated on the molding stage 41 or immediately before the molding layer surface. Fifth, the molding stage 41 moves downward by the thickness of the molding layer. Sixth, the first step to step described above are repeated until the shape of the three-dimensional object is completed. This method has an advantage that the molding time can be shortened by irradiating the molding beam and sintering or melting before the molding layer object particles 3 passing through the opening of the pressurized mesh cell 24 are seated.

A first embodiment of a method for color molding a three-dimensional object by using the three-dimensional molding system of the present invention will be described. First, determine the colors to apply. Through this, the color-specific molding material supply unit 13 constituting the molding material supply unit 12 is also determined. Second, the molding material particles supplied by the color-specific molding material supply unit 13 corresponding to one of the determined colors are flattened, and a first voltage is applied to the molding belt 11 so as to be on the outer surface of the molding belt 11. A mold preparation layer 2 is formed in the mold. Third, the molding belt 11 is driven to position the molding preparation layer 2 above the wire mesh 20. Fourth, the molding layer target particles 3 separated from the molding belt 11 by applying a second voltage to at least one pressurized mesh cell 24 selected by the control module 60 open the opening of the pressurized mesh cell 24. After passing, it rests on the molding stage 41 or immediately before the molding layer surface. Fifth, the second to fourth steps described above are repeated for all the determined colors. Sixth, the light source module 50 irradiates modeling light rays to the modeling layer target particles 3 seated on the modeling stage 41 or immediately before the modeling layer to form a modeling layer. For example, in the case of color molding using four colors, the molding layer target particles 3 are secured all after four cycles. Thus, after securing all the molding layer target particles 3, the molding ray is scanned. To form one molding layer. Seventh, the molding stage 41 moves downward by the thickness of the molding layer. Eighth, the second to seventh steps are repeatedly performed until the shape of the three-dimensional object is completed.

Although the present invention has been described with reference to the accompanying drawings, it is merely one example of various embodiments including the gist of the present invention, which can be easily implemented by those skilled in the art. It is clear that the present invention is not limited to the above-described embodiment only. Therefore, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent to the change, substitution, substitution, etc. within the scope not departing from the gist of the present invention shall be the right of the present invention. It will be included in the scope. In addition, some of the components of the drawings are intended to more clearly describe the configuration, and it is clear that the exaggerated or reduced size is provided.

Claims

In the head assembly of the three-dimensional molding apparatus for selectively seating the molding material particles on the molding stage to form a molding layer,

Modeling material supply unit 12 for supplying the molding material particles charged with a predetermined charge,

A modeling belt 11 in which a modeling preparation layer 2 is formed of the modeling material particles supplied from the modeling material supply unit 12 on an outer surface of the track and traveling in an endless track;

Belt-shaped modeling material feeding module 10 comprising a;

Located below the molding belt 11, and functions to selectively release the molding layer target particles (3) from the molding belt (11) from the mold preparation layer (2), a plurality of mesh cells Wire mesh 20 having a);

A first charging device that applies a first voltage to the surface of the molding belt 11, and applies a second voltage to at least one pressurized mesh cell 24 corresponding to the molding layer target particles 3 of the mesh cells 30;

It is made, including

The separation of the modeling layer object particle 3 from the modeling belt 11 is generated by an electric field formed between the modeling belt 11 and the pressurized mesh cell 24 by the first voltage and the second voltage. Head assembly of the three-dimensional molding apparatus characterized in that.
The method according to claim 1,

The absolute value of the first voltage is less than the absolute value of the second voltage head assembly of the molding apparatus.
The method according to claim 2,

The first voltage and the second voltage may be different from the modeling belt 11 and the pressurized mesh cell 24 than the first electrostatic force acting between the modeling belt 11 and the modeling layer target particle 3. The head assembly of the three-dimensional shaping apparatus, characterized in that the second electrostatic force applied to the modeling layer target particles (3) is determined to be larger by the electric field acting between the.
The method according to claim 1,

The wire mesh 20,

A first conductive wire array arranged at a predetermined distance and parallel to each other in one direction;

And a second conductive wire array (22) arranged in parallel with each other in a direction perpendicular to the first conductive wire array (21) at a predetermined interval.
The method according to claim 4,

The second voltage applied to the pressurized mesh cell 24 surrounds the pressurized mesh cell 24 among the conductive wires constituting the first conductive wire array 21 and the second conductive wire array 22. A head assembly of a three-dimensional shaping device, wherein the second voltage is applied to all four conductive wires to be formed.
The method according to claim 5,

The first conductive wire array (21) and the second conductive wire array (22) is a head assembly of the three-dimensional shaping apparatus, characterized in that each made of a metal material.
The method according to claim 1,

The modeling material supply unit 12, the head assembly of the three-dimensional molding apparatus characterized in that it comprises two or more color-specific molding material supply unit 13 to supply the molding material particles of two or more colors.
The method according to claim 1,

The belt molding material feeding module 10 further includes a molding material leveling unit 14 having a function of flattening molding material particles supplied to the molding belt 11 to a predetermined thickness. Head assembly of three-dimensional molding machine.
The method according to claim 1,

The belt-shaped molding material feeding module 10 is a molding material remaining in the molding belt 11 after the molding layer object 3 is separated from the molding belt 11 by the wire mesh 20. Head assembly of the three-dimensional molding apparatus further comprises a molding material removal unit for removing and collecting the particles.
The method according to claim 1,

The modeling material supply unit 12, the head assembly of the three-dimensional molding apparatus further comprises a second charging device for receiving the chargeable molding material particles to charge with a predetermined charge.
The head assembly of the three-dimensional molding apparatus of any one of claims 1 to 10;

The molding stage 41 positioned below the wire mesh 20 and separated from the molding belt 11 through the opening of the pressure mesh cell 24 is seated therein. Molding stage module 40 comprising a;

A light source module 50 for melting or sintering the modeling layer target particles 3 to form the modeling layer;

Three-dimensional molding apparatus comprising a.
The method according to claim 11,

The light source module 50 is a three-dimensional molding apparatus, characterized in that the line laser (line laser).
Three-dimensional molding apparatus according to claim 11;

A control module 60 for controlling the belt-type molding material feeding module 10, the first charging device 30, the molding stage module 40, and the driving of the light source module 50 in association with each other;

Three-dimensional molding system comprising a.
In the method of molding a three-dimensional object using the three-dimensional molding system of claim 13,

(i) The modeling material particles supplied by the modeling material supply unit 12 are flattened, and the modeling preparation layer 2 is applied on the outer surface of the modeling belt 11 by applying the first voltage to the modeling belt 11. Forming (s10);

(ii) driving the molding belt (11) to position the molding preparation layer (2) above the wire mesh (s20);

(iii) the molding layer target particle 3 separated from the molding belt 11 by applying the second voltage to at least one pressurizing mesh cell 24 selected by the control module 60 causes the pressing mesh cell ( After passing through the opening of the 24, step (s30) seated on the surface of the molding stage 41 or the previous molding layer;

(iv) a step in which the light source module 50 irradiates molding beams to the modeling layer target particles 3 seated on the modeling stage 41 or the previous modeling layer in step (iii) to form modeling layers; (s40);

(v) the molding stage 41 moves downward by the thickness of the molding layer (s50);

(vi) repeating steps (i) to (v) until the shape of the three-dimensional object is completed (s60);

Three-dimensional molding method using a three-dimensional molding system comprising a.
In the method of molding a three-dimensional object using the three-dimensional molding system of claim 13,

(a) The modeling material particles supplied by the modeling material supply unit 12 are flattened, and the modeling preparation layer 2 is applied on the outer surface of the modeling belt 11 by applying the first voltage to the modeling belt 11. Forming a step (s100);

(b) driving the molding belt (11) so that the molding preparation layer (2) is positioned above the wire mesh (s200);

(c) the molding layer target particle 3 separated from the molding belt 11 by applying the second voltage to at least one pressurizing mesh cell 24 selected by the control module 60 causes the pressing mesh cell ( Passing through the opening of step 24 (s300);

(d) melting or sintering the modeling layer target particles 3 by irradiating modeling rays to the modeling layer target particles 3 passing through the opening of the pressurized mesh cell 24 in step (c). (s400);

(e) step (s500) of the molding layer object particles (3) melted or sintered in the step (d) on the molding stage 41 or immediately before the molding layer surface;

(f) moving the molding stage 41 downward by the thickness of the molding layer (s600);

(g) repeating steps (a) to (f) until the shape of the three-dimensional object is completed (s700);

Three-dimensional molding method using a three-dimensional molding system comprising a.
In the method for color molding a three-dimensional object using the three-dimensional molding system of claim 13,

(A) determining colors to apply (s1000);

(B) the modeling material particles supplied by the corresponding color-specific molding material supply unit for one of the colors determined in step (a) are flattened, and the molding belt 11 is applied with the first voltage to apply the molding belt. Forming a molding preparation layer (2) on the outer surface of the track (11) (s2000);

(C) driving the molding belt (11) to position the molding preparation layer (2) above the wire mesh (s3000);

(D) by applying the second voltage to at least one pressurized mesh cell 24 selected by the control module 60, the molding layer target particles 3 separated from the forming belt 11 are pressurized mesh cells ( After passing through the opening of the 24, the step of seating on the surface of the molding stage 41 or the previous molding layer (s4000);

(S) repeating steps (b) to (d) for all colors determined in step (a) (s5000);

(Iii) irradiating molding beams to the modeling layer target particles (3) seated on the modeling stage (41) or the modeling layer surface immediately before the light source module (50) to form a modeling layer (s6000);

(S) moving the molding stage 41 downward by the thickness of the molding layer (s7000);

(O) repeating steps (b) to (g) until the shape of the three-dimensional object is completed (s8000);

Three-dimensional color molding method using a three-dimensional molding system comprising a.