JP2020151931A - Apparatus of manufacturing three-dimensional modeled product and method of manufacturing three-dimensional modeled product - Google Patents

Abstract

To provide an apparatus of manufacturing a three-dimensional modeled product, in which a flat particle-containing layer can be formed in manufacture of a three-dimensional modeled product in a slurry system.SOLUTION: The apparatus of manufacturing a three-dimensional modeled product includes: layer formation means that forms a particle-containing layer using a resin solution containing particles; curing means that performs curing a molding region in the particle-containing layer; and gap occlusion material application means that applies a gap occlusion material to the exposed surface of the particle-containing layer to occlude a gap in the exposed surface of the particle-containing layer in which the curing has been performed.SELECTED DRAWING: Figure 3B

Description

The present invention relates to an apparatus for manufacturing a three-dimensional model and a method for manufacturing a three-dimensional model.

The three-dimensional manufacturing method by powder lamination (hereinafter sometimes referred to as "powder lamination modeling method") is largely the laser sintering method (SLS), electron beam sintering method (EBM), or binder jet method (BJ). Separated.

The binder jet method is a technique for forming by using gypsum as a powder, ejecting binder ink from an inkjet head, and coagulating the gypsum powder. Further, it is a technique for forming a mold or the like by discharging a binder resin from an inkjet head using sand as a powder. Further, there are some that use metal, ceramics, or glass as the powder. For metals and ceramics, the powder is bound with a binder and then heated and sintered to form the final model.
As the powder laminating method, a dry powder method for laminating dry powder, a slurry method for laminating a mixture (slurry) of a powder and a resin solution, and the like are used.

As a slurry method, for example, at the time of forming the overhanging portion of the (k + 1) layer of the modeling method in which the binder liquid is applied to the layer containing the granules and cured, the coating is applied to the (k + 1) layer in the overhanging portion. In order to prevent the liquid component of the slurry from penetrating into the support portion of the k-th layer, a binder liquid is applied to the region of the support portion of the k-th layer that overlaps the overhanging portion of the (k + 1) layer, and a thin base layer Has been proposed (see, for example, Patent Document 1).

An object of the present invention is to provide an apparatus for producing a three-dimensional model capable of forming a flat particle-containing layer in the production of a slurry-type three-dimensional model.

The apparatus for producing a three-dimensional model of the present invention as a means for solving the above problems includes a layer forming means for forming a particle-containing layer using a resin solution containing particles and curing of a modeling region in the particle-containing layer. It has a curing means for forming a void blocking material and a void blocking material applying means for applying a void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the cured particle-containing layer.

According to the present invention, it is possible to provide an apparatus for producing a three-dimensional model capable of forming a flat particle-containing layer in the production of a slurry-type three-dimensional model.

FIG. 1 is a schematic view showing an example of a conventional three-dimensional model manufacturing apparatus. FIG. 2A is a schematic view showing an example of the operation of a conventional three-dimensional object manufacturing apparatus. FIG. 2B is a schematic view showing an example of the operation of a conventional three-dimensional object manufacturing apparatus. FIG. 2C is a schematic view showing an example of the operation of a conventional three-dimensional object manufacturing apparatus. FIG. 2D is a schematic view showing an example of the operation of a conventional three-dimensional object manufacturing apparatus. FIG. 2E is a schematic view showing an example of the operation of a conventional three-dimensional object manufacturing apparatus. FIG. 3A is a schematic view showing an example of the operation of the three-dimensional model manufacturing apparatus of the present invention. FIG. 3B is a schematic view showing an example of the operation of the three-dimensional model manufacturing apparatus according to the first embodiment of the present invention. FIG. 3C is a schematic view showing an example of the operation of the three-dimensional model manufacturing apparatus according to the first embodiment of the present invention. FIG. 3D is a schematic view showing an example of the operation of the three-dimensional model manufacturing apparatus according to the first embodiment of the present invention. FIG. 3E is a schematic view showing an example of the operation of the three-dimensional model manufacturing apparatus according to the first embodiment of the present invention. FIG. 4 is a schematic view showing an example of an apparatus for manufacturing a three-dimensional model according to a second embodiment of the present invention. FIG. 5 is a schematic view showing an example of a three-dimensional model manufacturing apparatus according to a third embodiment of the present invention. FIG. 6 is a schematic view showing an example of an apparatus for manufacturing a three-dimensional model according to a fourth embodiment of the present invention. FIG. 7 is a schematic view showing an example of an apparatus for manufacturing a three-dimensional model according to a fifth embodiment of the present invention. FIG. 8 is a schematic view showing an example of an apparatus for manufacturing a three-dimensional model according to a sixth embodiment of the present invention. FIG. 9 is a schematic view showing an example of a three-dimensional model manufacturing apparatus according to the seventh embodiment of the present invention. FIG. 10 is a schematic view showing an example of a three-dimensional model manufacturing apparatus according to the eighth embodiment of the present invention.

(Manufacturing equipment for 3D objects and manufacturing method for 3D objects)
In the three-dimensional model manufacturing apparatus of the present invention, a layer forming means for forming a particle-containing layer using a resin solution containing particles, a curing means for curing a modeling region in the particle-containing layer, and the curing are performed. It has a void blocking material imparting means for imparting a void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the particle-containing layer, and has a layer drying means, a dissolution removing means, and a baking. It is preferable to have a connecting means, and if necessary, other means.
The method for producing a three-dimensional model of the present invention includes a layer forming step of forming a particle-containing layer using a resin solution containing particles, a curing step of curing a modeling region in the particle-containing layer, and the curing. A layer drying step, a dissolution removal step, and a sintering step, which include a void blocking material applying step of applying a void blocking material to the exposed surface of the particle-containing layer so as to fill the voids on the exposed surface of the particle-containing layer. It is preferable to have the above, and if necessary, other steps are included.
The method for producing a three-dimensional model of the present invention can be suitably carried out using the apparatus for producing a three-dimensional model of the present invention, and the layer forming step can be preferably carried out by the layer forming means. The curing step can be more preferably carried out than the curing means, the void closing material applying step can be preferably carried out by the void closing material applying means, and the layer drying step is carried out by the layer drying means and the dissolution removal. The step can be suitably carried out by the dissolution and removal means, the sintering step can be preferably carried out by the sintering means, and the other steps can be preferably carried out by the other means. ..

The present inventors have investigated a device for producing a three-dimensional model capable of forming a flat particle-containing layer in the production of a slurry-type three-dimensional model, and obtained the following findings.
In the prior art, a binder is applied to the surface of the slurry layer of the support portion located below the overhang portion in order to suppress the permeation of the liquid component of the slurry into the support portion located below the overhang portion. There is a problem that the permeation of the liquid component of the slurry cannot be suppressed in the region other than the overhanging portion.
Further, in the prior art, it is necessary to apply the binder to the modeling region and then cure the binder by irradiation with ultraviolet rays, which causes a problem that the equipment cost increases.

Therefore, the present inventors have a layer forming means for forming a particle-containing layer using a resin solution containing particles, a curing means for curing a modeling region in the particle-containing layer, and the cured particles. By providing a three-dimensional model manufacturing apparatus having a void blocking material imparting means for applying a void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the particle-containing layer, the particles can be formed on the particle-containing layer. It is possible to prevent the liquid component of the resin solution supplied to the particle-containing layer from permeating into the particle-containing layer, thereby suppressing the increase in viscosity of the supplied resin solution, so that a flat particle-containing layer can be formed. I found it.

<Layer forming process and layer forming means>
The layer forming step is a step of forming a particle-containing layer using a resin solution containing particles.
The layer forming means is a means for forming a particle-containing layer using a resin solution containing particles.
The layer forming step can be preferably carried out by the layer forming means.

-Support-
The support (hereinafter, may be referred to as a liquid material layer holding means) is not particularly limited as long as the resin solution can be placed on the support, and can be appropriately selected depending on the intended purpose. Examples thereof include a table having a mounting surface, a base plate in the apparatus shown in FIG. 1 of JP-A-2000-328106, and the like. The surface of the support, that is, the mounting surface on which the resin solution is placed, may be, for example, a smooth surface, a rough surface, or a flat surface. It may be a curved surface.

-Formation of particle-containing layer-
The method for arranging the resin solution on the support is not particularly limited and may be appropriately selected depending on the intended purpose. For example, it may be referred to as a resin solution (“slurry” or “slurry material”). ) Is arranged in a thin layer, a method using a known counter rotation mechanism (counter roller) or the like used in the selective laser sintering method described in Japanese Patent No. 3607300, the slurry is brushed, a roller, and the like. Preferable examples thereof include a method of expanding into a thin layer using a member such as a blade, a method of pressing the surface of the particle-containing layer with a pressing member to expand into a thin layer, and a method of using a known powder lamination molding apparatus.

The slurry material can be placed on the support by using the counter rotation mechanism (counter roller), the brush or blade, the pressing member, or the like, for example, as follows. That is, for example, they are arranged in an outer frame (sometimes referred to as a "mold", a "hollow cylinder", a "cylindrical structure", etc.) so as to be able to move up and down while sliding on the inner wall of the outer frame. The slurry material is placed on the support using the counter rotation mechanism (counter roller), the brush, the roller or blade, the pressing member, and the like. At this time, when a support that can move up and down in the outer frame is used, the support is arranged at a position slightly lower than the upper end opening of the outer frame, that is, the particles are contained. The slurry material is placed on the support so as to be positioned below by the thickness of the layer (slurry layer). As described above, the slurry material can be placed on the support in a thin layer.

When the slurry material placed on the thin layer in this way is allowed to act on a laser, an electron beam, or a modeling liquid described later, curing occurs. On the cured product of the thin layer obtained here, the slurry material is placed on the thin layer in the same manner as described above, and the laser or the laser is applied to the slurry material (layer) placed on the thin layer. Curing occurs when an electron beam or a molding liquid is applied. The curing at this time occurs not only in the slurry material (layer) placed on the thin layer, but also in the cured product of the thin layer obtained by curing earlier, which exists under the slurry material (layer). .. As a result, a cured product (three-dimensional model) having a thickness equivalent to about two layers of the slurry material (layer) placed on the thin layer can be obtained.

Further, in order to place the slurry material on the support in a thin layer, it can be automatically and easily performed by using the known powder additive manufacturing apparatus. The powder additive manufacturing apparatus generally comprises a recorder for laminating the slurry material, a movable supply tank for supplying the slurry material onto the support, and the powder material placed on a thin layer. It is equipped with a movable molding tank for laminating. In the powder laminating molding apparatus, the surface of the supply tank can always be slightly raised above the surface of the molding tank by raising the supply tank, lowering the molding tank, or both. The powder material can be arranged in a thin layer from the supply tank side using the recorder, and the slurry material in the thin layer can be laminated by repeatedly moving the recorder. This powder additive manufacturing device may be replaced as it is for slurry lamination, or the recorder portion may be changed to a doctor blade for sheet molding.

The thickness of the particle-containing layer is not particularly limited and may be appropriately selected depending on the intended purpose. For example, the average thickness per layer is preferably 3 μm or more and 200 μm or less, and more preferably 10 μm or more and 100 μm or less. When the average thickness is 3 μm or more, the time until the three-dimensional model is obtained is appropriate, and problems such as shape loss do not occur during processing or handling such as sintering. On the other hand, when the average thickness is 200 μm or less, sufficient dimensional accuracy of the three-dimensional model can be obtained. The average thickness can be measured according to a known method.

The surface roughness (Ra) after the solvent volatilizes from the particle-containing layer is preferably 0.1 μm or more and 10 μm or less. When the surface roughness (Ra) is 0.1 μm or more, the surface is appropriately roughened to promote ink permeability, and when it is 10 μm or less, the amount of the modeling liquid is relative to the laminated surface. It can be applied uniformly. Further, when the surface roughness (Ra) of the particle-containing layer is within the above range, sufficient adhesive force between layers in the green body obtained by modeling can be obtained.
Further, it is preferable that the surface roughness in a state where the slurry is dried and stabilized through the drying step is 0.1 μm or more and 10 μm or less. When the state of the slurry is stable, the variation in each lamination can be reduced.
The surface roughness (Ra) can be measured as follows. The particle-containing layer is laid with a resin solution (slurry), and if necessary, the solvent is removed to bring it into a state before the modeling liquid is applied. At this time, the layer of the first three-dimensional modeling material is measured by arbitrarily selecting five points on the layer surface using a laser microscope (device name: VK-X250, manufactured by KEYENCE CORPORATION). The objective lens is 20 times, and the average value is obtained from the obtained measured values and used as the surface roughness (Ra).

-Particle-containing layer-
The particle-containing layer is a layer formed by flattening a resin solution containing particles by a layer forming means.

--Resin solution ---
The resin solution contains particles, a dissolved resin, a solvent, and if necessary, other components. In this specification, the resin solution may be referred to as a slurry.

--- Particles ---
The shape, structure, average particle diameter, and material of the particles are not particularly limited and may be appropriately selected depending on the intended purpose.
Examples of the material of the particles include metals and ceramics. These may be used alone or in combination of two or more.
Examples of the metal include stainless steel, aluminum, titanium and the like. These may be used alone or in combination of two or more.
Examples of the ceramics include glass, alumina, zirconia and the like. These may be used alone or in combination of two or more.

--- Solvent ---
The solvent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include water and organic solvents.
Examples of the organic solvent include acetone, ethanol, benzene, chloroform, toluene and the like.

--- Resin ---
The resin can be appropriately selected depending on the type of solvent in the resin solution.
When the solvent is water, examples thereof include polyvinyl alcohol (PVA) and polyglycolic acid (PGA).
When the solvent is an organic solvent, examples thereof include polyvinyl butyral (PVB), polymethylmethacrylate (PMMA), biphenyl, polyvinyl acetate and the like.

--- Other ingredients ---
The other components are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include dehydration condensing agents, dispersants, plasticizers, sintering aids and the like, and in particular, a dehydration condensing agent is added. It is preferable to do so. When the resin solution contains the dispersant, it is preferable in that the dispersibility of the particles can be improved and sedimentation at rest can be suppressed, and the particles are continuously formed when forming a green sheet or a green body. It becomes easier to exist. Further, it is preferable to include the plasticizer in that cracks are less likely to occur when the green sheet or the green body precursor composed of the resin solution is dried. It is preferable to include the sintering aid in that the obtained laminated modeled product can be sintered at a lower temperature when it is subjected to a sintering treatment.

--- Dehydration condensate ---
The dehydration condensing agent is preferably added to at least one of the resin solution and the modeling solution. Further, it is more preferable to heat-treat the three-dimensional model obtained when added. By adding a dehydration condensing agent or heating the three-dimensional structure, a covalent bond can be formed in a part of the crosslink by the electrostatic interaction between the resin and the organic compound B, and the bond of the electrostatic interaction can be formed. Covalent bonds will be mixed in the three-dimensional model. Since the electrostatic interaction bond has a high water affinity, the flexural modulus and hardness tend to decrease due to water absorption and swelling, but the covalent bond keeps the hardness of the three-dimensional model constant. It can be kept above. As a result, when the three-dimensional model is taken out in the removal step described later, it can be easily taken out without deformation or chipping.
The dehydration condensing agent means a reaction reagent for synthesizing a carboxylic acid derivative such as an ester-amide bond by an addition / elimination reaction.

The dehydration condensing agent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include carbodiimide condensing agent, imidazole condensing agent, triazine condensing agent, phosphonium condensing agent, uronium condensing agent and halonium condensing agent. Can be mentioned. These may be used alone or in combination of two or more.
Examples of the carbodiimide condensing agent include 1- [3- (dimethylamino) propyl] -3-ethylcarbodiimide, 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride, and N, N'-dicyclohexylcarbodiimide (DCC). , N, N'-diisopropylcarbodiimide and the like.
Examples of the imidazole condensing agent include N, N'-carbonyldiimidazole, 1,1'-carbonyldi (1,2,4-triazole) and the like.
Examples of the triazine condensing agent include 4- (4,6-dimethoxy-1,3,5-triazine-2-yl) -4-methylmorpholinium = chloride n hydrate and trifluoromethanesulfonic acid (4,6). -Dimethoxy-1,3,5-triazine-2-yl)-(2-octoxy-2-oxoethyl) dimethylammonium and the like can be mentioned.
Examples of the phosphonium condensing agent include 1H-benzotriazole-1-yloxytris (dimethylamino) phosphonium hexafluorophosphate, 1H-benzotriazole-1-yloxytripyrrolidinophosphonium hexafluorophosphate, (7-). Azabenzotriazole-1-yloxy) tripyrrolidinophosphonium hexafluorophosphate, chlorotripyrrolidinophosphonium hexafluorophosphate, bromotris (dimethylamino) phosphonium hexafluorophosphate, 3- (diethoxyphosphoryloxy)- Examples thereof include 1,2,3-benzotriazine-4 (3H) -one.
Examples of the uronium condensing agent include O- (benzotriazole-1-yl) -N, N, N', N'-tetramethyluronium hexafluorophosphate and O- (7-azabenzotriazole-1-yl). ) -N, N, N', N'-tetramethyluronium hexafluorophosphate, O- (N-succinimidyl) -N, N, N', N'-tetramethyluronium tetrafluoroborate, O- (N-succinimidyl) -N, N, N', N'-tetramethyluronium hexafluorophosphate, O- (3,4-dihydro-4-oxo-1,2,3-benzotriazine- 3-Il) -N, N, N', N'-tetramethyluronium tetrafluoroborate, S- (1-oxide-2-pyridyl) -N, N, N', N'-tetramethylthio Uronium tetrafluoroborate, O- [2-oxo-1 (2H) -pyridyl] -N, N, N', N'-tetramethyluronium tetrafluoroborate, {{[(1-cyano) -2-ethoxy-2-oxoethylidene) amino] oxy} -4-morpholinomethylene} dimethylammonium hexafluorophosphate and the like.
Examples of the halonium condensing agent include 2-chloro-1,3-dimethylimidazolinium hexafluorophosphate, 1- (chloro-1-pyrrolidinyl methylene) pyrrolidinium hexafluorophosphate, and 2-fluoro-. Examples thereof include 1,3-dimethylimidazolinium hexafluorophosphate, fluoro-N, N, N', N'-tetramethylformamidinium hexafluorophosphate and the like.
Among these, 4- (4,6-dimethoxy-1,3,5-triazine-2-yl) -4-methylmorpholinium is used as a triazine condensing agent that reacts in a polar solvent such as water or alcohol. = Chloride n hydrate (DMT-MM) is preferred.

The content of the dehydration condensing agent is 3 parts by mass or more and 20 parts by mass with respect to at least 100 parts by mass of the first liquid material for three-dimensional modeling and the modeling liquid from the viewpoint of the hardness of the three-dimensional model. Part or less is preferable.

<Layer drying process and layer drying means>
The layer drying means is a means for drying the obtained slurry layer after the layer forming step and before the curing step.
The layer drying step is a step of drying the obtained slurry layer after the layer forming step and before the curing step, and is performed by the layer drying means. Of course, natural drying may be performed. In the layer drying step, the water (solvent) contained in the slurry layer can be volatilized. In the layer drying step, it is preferable to remove all the solvent from the slurry layer. Examples of the layer drying means include known dryers.
By flattening and drying the slurry layer, the resin in the solution is deposited on the surface of the particles to form a film.

The drying time in the layer drying step can be appropriately changed.

<Curing means and curing process>
The curing step is a step of curing the modeling region in the particle-containing layer.
The curing means is a means for curing a modeling region in the particle-containing layer.
The curing step can be preferably carried out by the curing means.
The "curing" means that the resin in the particle-containing layer is dissolved and solidified by the modeling liquid.

The modeling region means a region in which a modeling liquid is applied to the particle-containing layer to form a three-dimensional model. In addition, with respect to the modeling region, the non-modeling region means a region in the particle-containing layer in which a three-dimensional model is not modeled without applying a modeling liquid.

The modeling liquid is not particularly limited as long as it can react with the resin in the resin solution to dissolve and solidify the resin, and can be appropriately selected depending on the intended purpose.
When the resin is water-soluble, examples of the modeling liquid include water.
When the resin is soluble in an organic solvent, the modeling liquid includes, for example, an organic solvent. As the organic solvent, for example, the same organic solvent as that used for the resin solution can be used.
In addition, the modeling liquid may contain an aqueous medium, a viscosity modifier, a cross-linking agent for cross-linking a resin, other components, and the like.

Examples of the aqueous medium include water, alcohols such as methanol and ethanol, ethers, ketones, and the like. These may be used alone or in combination of two or more. Of these, water is preferable. The aqueous medium may be such that the water contains a small amount of a component other than water such as the alcohol.
Examples of the water include ion-exchanged water, ultrafiltration water, reverse osmosis water, pure water such as distilled water, and ultrapure water.

Examples of the other components include dehydration condensing agents, surfactants, preservatives, preservatives, stabilizers, pH adjusters and the like.

The modeling liquid can be suitably used for simple and efficient production of various laminated models and structures, and is particularly suitable for the method for producing a three-dimensional model and the apparatus for producing a three-dimensional model, which will be described later. Can be used.

The curing means for applying the molding liquid to the particle-containing layer (slurry layer) is not particularly limited and may be appropriately selected depending on the intended purpose. For example, it is used in a dispenser method, a spray method, an inkjet method and the like. Examples include liquid discharge means. In the present invention, a liquid ejection means (a device that ejects droplets from a plurality of nozzles using a vibrating element such as a piezoelectric actuator) used in the above-mentioned inkjet method in that a complicated three-dimensional shape can be formed accurately and efficiently). Is preferable.
When the drying step is performed, the film formed by the resin deposited on the particle surface is dissolved and solidified by the modeling liquid, so that the particle-containing layer is used without using a high-cost device such as a UV irradiation device. Can be cured.

<Void blocking material applying process and void closing material applying means>
The void blocking material applying step is a step of applying the void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the cured particle-containing layer.
The void blocking material applying means is a means for applying a void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the cured particle-containing layer.
The gap closing material applying step can be preferably carried out by the void closing material applying means.

The "exposed surface" means the outermost surface of the particle-containing layer on the side opposite to the side facing the support.
The “void” means a gap formed by particles forming the particle-containing layer.

The void closing material applying means is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a dispenser and an inkjet unit. Among these, an inkjet unit is preferable. When the void blocking material applying means is an inkjet unit, the amount of the filler applied to the particle-containing layer can be adjusted only to the amount that penetrates the voids. Then, the amount of the void blocking material used can be reduced, and the step of squeezing (leveling) the void closing material becomes unnecessary, and the productivity can be improved.
The void closing material applying means applies the void closing material to the formed region and the non-formed region in the particle-containing layer.

-Void blocker-
The void blocking material is a material that closes the voids of the particle-containing layer. When the void blocking material is applied to the particle-containing layer, the voids in the particle-containing layer are filled. Therefore, even if the resin solution is applied onto the particle-containing layer, it is possible to suppress the permeation of the liquid component of the resin solution into the voids of the particle-containing layer, thereby suppressing the increase in viscosity of the supplied resin solution. Therefore, a flat particle-containing layer can be formed.

The void blocking material is not particularly limited and may be appropriately selected depending on the intended purpose. For example, the void closing material needs to be a fluid insoluble in the resin solution, and is further a refractory fluid. It has characteristics such as being a fluid that volatilizes and forms a film, a fluid having a viscosity of 300 Pa · s or more, a fluid having a higher specific gravity than the resin solution, and being soluble in a solution described later. Materials can be mentioned.
Further, the void closing material is preferably a material that is more soluble in the dissolution liquid described later.

Examples of the fluid that is insoluble in the resin solution and hardly volatile includes oil, isophorone, diethylene glycol monobutyl ether, ethylene glycol, triethylene glycol monobutyl ether, dicarboxylic acid methyl ester mixture, and γ-butyrolactone. ..
The "non-volatile" means a property that is not volatile, and means a property that is less volatile than a volatile liquid. Non-volatile includes non-volatile. The refractory fluid is a fluid that does not volatilize when it permeates the voids of the particle-containing layer at normal temperature and pressure.
When the void blocking material is a fluid that is insoluble in the resin solution and is hardly volatile, it suppresses the liquid component of the resin solution supplied onto the particle-containing layer from penetrating into the lower particle-containing layer. Therefore, it is possible to suppress the increase in viscosity of the supplied resin solution, so that a flat particle-containing layer can be formed.

Examples of the fluid that is insoluble in the resin solution and has a viscosity of 300 mPa · s or more include oil. In addition, isophorone, diethylene glycol monobutyl ether, ethylene glycol, triethylene glycol monobutyl ether, dicarboxylic acid methyl ester mixture, γ-butyrolactone, etc., which have been thickened by adding a resin, can also be used. Examples of the additive resin include polyvinyl butyral (PVB), polymethylmethacrylate (PMMA), biphenyl, polyvinyl acetate and the like.
When the void blocking material is a fluid that is insoluble in the resin solution and has a viscosity of 300 mPa · s or more, the void closing material contains the particles when the void closing material is applied on the particle-containing layer. It stays on the outermost surface of the layer and can suppress the penetration of the liquid component of the resin solution. Therefore, it is not necessary to provide a void blocking material that only fills all the voids in the particle-containing layer, and only the amount that remains on the outermost surface needs to be provided, so that the amount of the void closing material used can be reduced.

Examples of the fluid that is insoluble in the resin solution and volatilizes to form a film include isophorone to which a resin is added, diethylene glycol monobutyl ether, ethylene glycol, triethylene glycol monobutyl ether, a mixture of dicarboxylic acid methyl ester, and γ-butyrolactone. And so on. Examples of the additive resin include polyvinyl butyral (PVB), polymethylmethacrylate (PMMA), biphenyl, polyvinyl acetate and the like.
If the void blocking material is a fluid that is insoluble in the resin solution and volatilizes to form a film, the void blocking material forms a film while remaining on the outermost surface of the particle-containing layer before penetrating into the voids. Therefore, the permeation of the liquid component of the resin solution can be suppressed. Therefore, it is not necessary to provide a void blocking material that fills all the voids in the particle-containing layer, and it is sufficient to provide only the outermost surface of the film, so that the amount of the void closing material used can be reduced.
Further, if the void blocking material is a fluid that is insoluble in the resin solution and volatilizes to form a film, the process can be immediately shifted to the next layer forming step, so that the productivity can be improved. it can.

Examples of the fluid that is insoluble in the resin solution and has a higher specific gravity than the resin solution include ethylene glycol, a dicarboxylic acid methyl ester mixture, and γ-butyrolactone when the resin solution is an aqueous solution.
When the void blocking material is a fluid that is insoluble in the resin solution and has a higher specific gravity than the resin solution, it is possible to prevent the void closing material and the resin solution from mixing and segregating the void closing material. it can.

When the void closing material is a material that is soluble in the dissolution liquid, it is possible to easily remove the non-formation region to which the particles are not bound when the modeled object is immersed in the dissolution liquid. The void blocking material of the material that is soluble in the dissolution liquid is in a state where the voids in the modeling region are also filled, but since the particles in the modeling region are bound to each other, the shape is formed even when immersed in the dissolution liquid. Therefore, it is possible to easily remove only the non-molded region in which the particles are not settled with each other.
For example, when the resin solution is an aqueous solution of "a resin soluble in water and insoluble in an organic solvent", the filler is "a resin insoluble in water and soluble in an organic solvent", and the solution is an organic solvent. The material can be as follows.
Examples of the "water-soluble and water-insoluble resin" include polyvinyl alcohol (PVA), polyglycolic acid (PGA), glucose and the like.
Examples of the "water-insoluble and soluble in an organic solvent" include polyvinyl butyral (PVB), polymethylmethacrylate (PMMA), biphenyl, polyvinyl acetate and the like.
Examples of the organic solvent include acetone, ethanol, benzene and chloroform.

--Other materials ---
Examples of the other material include void-occluded particles and the like.

--- Void-blocking particles ---
The void-blocking particles are not particularly limited as long as they can block the voids on the exposed surface of the particle-containing layer, and can be appropriately selected depending on the intended purpose. For example, a sintering aid and the resin solution can be used. Examples thereof include particles having the same composition as the contained particles.

If the void-blocking particles are a sintering aid, the sintering aid can promote the sintering of the modeled object when the modeled object is sintered after the non-modeled region is removed. Since the void-blocking particles are sintering aids, even if the particles are difficult-to-sinter materials, they can be sufficiently sintered.
Examples of the difficult-to-sinter material include aluminum, tungsten, titanium, molybdenum, niobium and alloys thereof for metals, aluminum nitride and alumina for ceramics, tungsten carbide, titanium carbide, chrome carbide and silicon carbide for carbides. Is done.
The sintering aid is not particularly limited as long as it is a material that forms a liquid phase with the particles, and can be appropriately selected depending on the intended purpose. For example, when the particles are aluminum or an alloy thereof, the sintering aid. Examples of the agent include silicon, copper, tin, magnesium, iron, manganese, titanium, nickel, zinc and chromium. Also, alloys of them and particles can be used as sintering aids.

When the void blocking particles are particles having the same composition as the particles contained in the resin solution, the geometric filling rate can be improved and the density of the modeled object can be increased. Since the particle density of the modeled object is improved, the mechanical strength of the final modeled object can be improved.

In the void closing material imparting step, the voids of the particle-containing layer formed in the layer forming step are closed by the void closing material, and the resin solution is applied again on the formed particle-containing layer to obtain new particles. Even when the containing layer is formed, the liquid component of the resin solution forming the new particle-containing layer permeates into the voids of the lower particle-containing layer, so that the viscosity of the resin solution is improved and flattening is hindered. Can be prevented. That is, a flat particle-containing layer can be formed by applying the void blocking material to the particle-containing layer.

<Heating process and heating means>
The heating step is a step of heating the formed particle-containing layer.
The heating means is a means for heating the formed particle-containing layer.
The heating step can be preferably carried out by the heating means.
Examples of the heating means include an infrared heater, a hot plate, a high-temperature heating furnace, and the like.
For example, by heating a polyionic complex of polyacrylic acid and polyethyleneimine at 150 ° C. or higher for 10 minutes or longer, a part of the cross-linking of electrostatic interaction can be made into an amide bond (covalent bond) which is a chemical bond. It is known that it can be done (see Advances in Colloid and Interface Science 158 (2010) 84-93).

The heating step is not particularly limited and may be appropriately selected depending on the intended purpose. It is preferably performed after repeated lamination and before the step of removing the unreacted slurry, and the bonding by electrostatic interaction of the polyion complex is preferable. From the temperature at which a covalent bond such as an amide bond can be formed by the dehydration condensation reaction, it is preferable to carry out the reaction within a range in which the dehydration condensation reaction does not proceed too much and a bond due to electrostatic interaction exists. If the dehydration reaction by heating proceeds too much, the three-dimensional model may become brittle. When the three-dimensional model becomes brittle, it becomes difficult to take out only the region to which the modeling liquid is applied as the three-dimensional model without any trouble such as chipping.
The heating temperature is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 100 ° C. or higher and 300 ° C. or lower, and more preferably 100 ° C. or higher and 200 ° C. or lower.

<Dissolution removal step and dissolution removal means>
The dissolution / removal step is a step of dissolving and removing the non-modeled region in the particle-containing layer with a dissolution liquid.
The dissolution / removal means is a means for dissolving and removing a non-molded region in the particle-containing layer with a dissolution liquid.
That is, the dissolution / removal step is a step of immersing the three-dimensional model formed by sequentially repeating the layer forming step and the liquid material applying step in the dissolution liquid to remove the unreacted particle-containing resin solution (slurry). is there.
In the dissolution / removal step, the resin contained in the unreacted particle-containing layer can be salted to impart water solubility.

Examples of the dissolution / removal means include disintegration due to standing, disintegration due to ultrasonic irradiation, disintegration due to liquid stirring, and the like.

-Solution-
The solution contains an alkali metal hydroxide that dissolves the resin in the resin solution, and further contains an aqueous medium, a surfactant, and other components, if necessary.

--Alkali metal hydroxide ---
The alkali metal hydroxide is not particularly limited as long as it exhibits reactivity with the resin and forms a salt, and can be appropriately selected depending on the intended purpose. A substance that forms a salt with the resin and the like can be used. Can be mentioned.

Examples of the alkali metal hydroxide include lithium hydroxide, sodium hydroxide, potassium hydroxide and the like. The reactivity means that the resin exhibits an ionic interaction with the acidic group and forms a salt.
The solution preferably contains a plurality of alkali metal hydroxides.

The content of the alkali metal hydroxide is preferably 1 part by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the solution. When the content is 1 part by mass or more, a salt with the resin in the first liquid material for three-dimensional modeling can be sufficiently formed and reacts with the organic compound B in the second liquid material for three-dimensional modeling. Since only the part other than the resin (unreacted resin) can be dissolved, the obtained green sheet or green body can be taken out without damage. On the other hand, when the content is 20 parts by mass or less, the viscosity of the solution can be lowered, the liquid material can be immersed in a fine portion of the green body, and the green body can be taken out more accurately.

--Aqueous medium ---
Examples of the aqueous medium include water, alcohols such as methanol and ethanol, and the like. These may be used alone or in combination of two or more. Of these, water is preferable. The aqueous medium may be such that the water contains a small amount of a component other than water such as the alcohol. Examples of the water include ion-exchanged water, ultrafiltration water, reverse osmosis water, pure water such as distilled water, and ultrapure water.

--Surfactant ---
The surfactant is not particularly limited as long as it does not show reactivity with the resin, and can be appropriately selected depending on the intended purpose. Examples thereof include anionic surfactants and nonionic surfactants. Be done. Examples of the anionic surfactant include alkylbenzene sulfonate, α-olefin sulfonate, phosphate ester, disulfonate, cholic acid salt, deoxycholate salt and the like.
Examples of the nonionic surfactant include fatty acid amide derivatives, polyhydric alcohol derivatives, poly (oxyethylene) octylphenyl ethers and the like.

--Other ingredients ---
Examples of the other components include preservatives, preservatives, stabilizers, pH regulators and the like.

The removal time in the dissolution removal step can be appropriately changed. If the removal time is lengthened, the minute acidic groups contained in the resin solution react to become water-soluble, so that the cured product obtained in the liquid material application step tends to disintegrate. On the other hand, if the removal time is shortened, the acidic groups contained in the unreacted slurry layer do not react sufficiently, so that the removal tends to be insufficient. This may be appropriately selected depending on the material type to be used.

<Sintering process and sintering means>
The sintering step is a step of sintering a three-dimensional model formed by sequentially repeating the layer forming step and the liquid material applying step, and is performed by a sintering means. By performing the sintering step, the cured product can be made into an integrated molded body (sintered body).
Examples of the sintering means include known sintering furnaces.

As the sintering step, in addition to the method of obtaining a cured product and then sintering as described above, there is a method of sintering at the stage of laminating the resin solution. The method of sintering at the stage of laminating the resin solution is a method of sintering the particle-containing layer by performing either laser irradiation or electron beam irradiation on the particle-containing layer.

-Laser irradiation-
The laser in the laser irradiation is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a CO ₂ laser, an Nd-YAG laser, a fiber laser, and a semiconductor laser. The conditions for the laser irradiation are not particularly limited and may be appropriately selected depending on the intended purpose. However, for example, when a small laser is used, the particles cannot be melted, so that an adhesive to be used together (for example, an adhesive) is used. It is preferable to mix a polyester-based adhesive) and melt the adhesive by laser irradiation to form a model. In that case, it is preferable to use a CO ₂ laser. As the irradiation conditions, for example, a laser output of 15 W, a wavelength of 10.6 μm, and a beam diameter of about 0.4 mm are preferable.

-Electron beam irradiation-
The electron beam irradiation is not limited to irradiation other than irradiation with an electron beam having an energy that melts the particles in the resin solution, and can be appropriately selected depending on the intended purpose. When irradiating an electron beam, the resin solution needs to be handled in a vacuum environment. The conditions for the electron beam irradiation are not particularly limited and may be appropriately selected depending on the intended purpose. For example, the output is 1,500 W, the beam diameter is 0.1 mm, and the degree of vacuum is about 1.0 × ^10-5 mbar. Is preferable.

<Other processes and other means>
Examples of the other steps include a surface protection step and a painting step.
Examples of the other means include surface protection means, painting means, and the like.

-Surface protection process and surface protection means-
The surface protection step is a step of forming a protective layer on the three-dimensional model formed in the liquid material applying step or the sintering step. By performing the surface protection step, the surface of the three-dimensional model can be provided with durability such that the three-dimensional model can be used as it is, for example.
Examples of the protective layer include a water resistant layer, a weather resistant layer, a light resistant layer, a heat insulating layer, and a glossy layer.
Examples of the surface protection means include known surface protection treatment devices such as a spray device and a coating device.

-Painting process and painting means-
The painting step is a step of painting the three-dimensional model. By performing this painting step, the three-dimensional model can be colored in a desired color. Examples of the coating means include known coating devices, such as a coating device using a spray, a roller, a brush, or the like.

As the three-dimensional modeling method of the present invention, it is preferable to form the three-dimensional model by performing the layer forming step, the curing step, and the void closing material applying step a plurality of times in this order.

Hereinafter, specific embodiments of the three-dimensional model manufacturing apparatus of the present invention will be described in detail with reference to the drawings. In addition to explaining the embodiment of the three-dimensional model manufacturing apparatus of the present invention, a specific embodiment of the method for manufacturing the three-dimensional model of the present invention will also be described.
In each drawing, the same components may be designated by the same reference numerals and duplicate description may be omitted. Further, the number, position, shape, etc. of the following constituent members are not limited to the present embodiment, and can be a preferable number, position, shape, etc. for carrying out the present invention.

FIG. 1 is a side view showing an example of a basic configuration of a conventional three-dimensional object manufacturing apparatus.
The three-dimensional model manufacturing apparatus 10 shown in FIG. 1 supplies a stage 102, a flattening member 21 as a layer forming means, and a resin solution 112 (hereinafter, referred to as slurry 111) containing particles 113 onto the stage 102. It has a slurry supply device 101 to be used, and a modeling unit 31 as a curing means for discharging the modeling liquid 32.

2A to 2E are diagrams showing an example of the operation of a conventional three-dimensional object manufacturing apparatus.
As shown in FIG. 2A, first, the three-dimensional model manufacturing apparatus 10 supplies a resin solution 112 (hereinafter, referred to as slurry 111) containing particles 113 onto the stage 102.
Next, as shown in FIG. 2B, in the three-dimensional model manufacturing apparatus 10, the slurry 111 supplied onto the stage 102 is leveled by the flattening member 21, and the slurry 111 is on the side opposite to the side facing the stage 102. By flattening the outermost surface, a particle-containing layer is formed.
Next, as shown in FIG. 2C, the formed particle-containing layer is dried to remove the solvent component in the slurry 111. At this time, the resin solution 112 of the slurry 111 is deposited on the surface of the particles 113 to form a film 114 on the particles.
Next, as shown in FIG. 2D, the modeling liquid 32 is discharged from the modeling unit 31 to a desired region of the particle-containing layer, and the coating film 114 precipitated on the surface of the particles 113 is dissolved and solidified to form the modeling region 121. .. The region where the modeling liquid 32 is not discharged becomes the non-modeling region 122. As shown in FIG. 2D, the particle-containing layer forming the shaped region 121 and the non-shaped region 122 has voids in its layer structure.
FIG. 2E is a diagram showing an operation of supplying the slurry 111 of the next layer onto the particle-containing layer forming the modeling region 121 and the non-modeling region 122. In the conventional three-dimensional model manufacturing apparatus, as shown in FIG. 2E, the slurry 111 for forming the next layer is supplied to the particle-containing layer shown in FIG. 2D, so that the liquid component of the slurry 111 is supplied. Infiltrates into the voids of the lower particle-containing layer, and the viscosity of the supplied slurry 111 is improved, so that there is a problem that it is difficult to form a flat particle-containing layer.
In the present invention, by performing the operation of applying the void blocking material shown in the following embodiment before performing the operation of FIG. 2E, the permeation of the liquid component of the slurry into the lower particle-containing layer is suppressed. A flat particle-containing layer can be formed.
Hereinafter, embodiments of the three-dimensional model manufacturing apparatus and the three-dimensional model manufacturing method of the present invention will be described in detail.

<First Embodiment>
3A to 3E are views for explaining the operation of the three-dimensional model manufacturing apparatus according to the first embodiment of the present invention.
FIG. 3A shows an example of the state of the particle-containing layer forming the forming region 121 and the non-forming region 122 of the nth layer (n is a natural number). In the present embodiment, after the n-th layer slurry 111 is flattened and the solvent is dried, as shown in FIG. 3B, the void blocking material 42a is applied to the entire surface of the formed particle-containing layer by the void closing material imparting means 41a. Give. Next, as shown in FIG. 3C, the applied void blocking material 42a is applied to the entire particle-containing layer by the flattening member 21, so that the void closing material 42a closes the voids in the nth particle-containing layer. To do. Then, as shown in FIGS. 3D and 3E, the slurry 111 of the next layer is supplied to the (n + 1) layer and flattened.
In this way, before supplying the slurry for forming the next layer (n + 1th layer) on the particle-containing layer of the lower layer (nth layer), the particle-containing layer formed in the lower layer (nth layer) By applying a void blocking material to the voids to close the voids in the lower layer (nth layer), even if the slurry of the next layer (n + 1th layer) is supplied, the liquid component of the slurry moves to the lower layer (nth layer). Penetration can be suppressed.
In the present embodiment, a fluid that is insoluble in the resin solution and is hardly volatile is used as the void closing material 42a. Since the void closing material 42a is insoluble in the resin solution, it can be prevented from being dissolved in the resin solution of the slurry supplied to the next layer (n + 1th layer), and it is difficult to volatilize. When the slurry of the next layer (n + 1th layer) is supplied, it is possible to ensure that the voids of the particle-containing layer of the lower layer (nth layer) are closed.

<Second embodiment>
FIG. 4 is a diagram illustrating a three-dimensional model manufacturing apparatus according to a second embodiment of the present invention. In the second embodiment shown in FIG. 4, the void blocking material 42a in the first embodiment is changed to a void closing material 42b which is insoluble in the resin solution and has a viscosity of 300 mPa · s or more. It is the same as the first embodiment except that the above is performed.
As shown in FIG. 4, in the present embodiment, since the void blocking material is a fluid that is insoluble in the resin solution and has a viscosity of 300 mPa · s or more, it is supplied to the next layer (n + 1th layer). It can be prevented from being dissolved in the resin solution of the slurry, and when the viscosity is 300 mPa · s or more, the void blocking material does not penetrate into the nth particle-containing layer and stays on the surface layer. The amount of the void blocking material can be reduced.

<Third embodiment>
FIG. 5 is a diagram illustrating a three-dimensional model manufacturing apparatus according to a third embodiment of the present invention. In the third embodiment shown in FIG. 5, the void closing material 42a in the first embodiment is changed to the void closing material 42c, which is a fluid that is insoluble in the resin solution and volatilizes to form a film. Other than that, it is the same as that of the first embodiment.
As shown in FIG. 5, in the present embodiment, since the void blocking material is insoluble in the resin solution, it is possible to prevent the void blocking material from being dissolved in the resin solution of the slurry supplied to the next layer (n + 1th layer). By volatilizing and forming a film, the film is formed while remaining on the outermost surface of the particle-containing layer before penetrating into the nth particle-containing layer. Therefore, the void blocking material does not permeate into the nth particle-containing layer and stays on the surface layer, so that the amount of the void closing material used can be reduced.

<Fourth Embodiment>
FIG. 6 is a diagram illustrating a three-dimensional model manufacturing apparatus according to a fourth embodiment of the present invention. The fourth embodiment shown in FIG. 6 is the same as the first embodiment except that the void closing material applying means 41a in the first embodiment is changed to the void closing material applying means 41b which is an inkjet unit. ..
As shown in FIG. 6, in the present embodiment, since the void blocking material applying means is an inkjet unit, the amount of the filler applied to the nth particle-containing layer can be adjusted only to the amount that permeates the voids. Then, the amount of the void blocking material used can be reduced, and the step of squeezing (leveling) the void closing material becomes unnecessary, and the productivity can be improved.

<Fifth Embodiment>
FIG. 7 is a diagram illustrating a three-dimensional model manufacturing apparatus according to a fifth embodiment of the present invention. In the fifth embodiment shown in FIG. 7, the first embodiment except that the void closing material 42a in the first embodiment is changed to the void closing material 42d in which the void closing material is soluble in the solution. Is similar to.
As shown in FIG. 7, in the present embodiment, since the void blocking material is soluble in the dissolution liquid, when the modeled object is immersed in the dissolution liquid, the non-modeled region to which the particles are not bound is removed. It can be made easier.

<Sixth Embodiment>
FIG. 8 is a diagram illustrating a three-dimensional model manufacturing apparatus according to a sixth embodiment of the present invention. The sixth embodiment shown in FIG. 8 is the same as the first embodiment except that the sintering aid 43a is added to the void closing material 42a in the first embodiment.
As shown in FIG. 8, in the present embodiment, since the void blocking material contains the sintering aid, the sintering aid penetrates into the voids of the particle-containing layer together with the void closing material. The sintering aid that has penetrated into the voids can efficiently promote the sintering of the modeled object when the modeled object is sintered after the dissolution / removal step or the like.

<7th Embodiment>
FIG. 9 is a diagram illustrating a three-dimensional model manufacturing apparatus according to a seventh embodiment of the present invention. The seventh embodiment shown in FIG. 9 is the same as the first embodiment except that the particles 113 are added to the void blocking material 42a in the first embodiment.
As shown in FIG. 9, in the present embodiment, since the void blocking material contains particles, the particles permeate into the voids of the particle-containing layer together with the void closing material. The particles that have penetrated the voids improve the particle density of the modeled object, so that the mechanical strength of the final modeled object can be improved.

<8th Embodiment>
FIG. 10 is a diagram illustrating a three-dimensional model manufacturing apparatus according to an eighth embodiment of the present invention. In the eighth embodiment shown in FIG. 10, the void blocking material 42a in the first embodiment is applied to the void closing material 42e, which is a fluid that is insoluble in the resin solution and has a higher specific gravity than the resin solution. It is the same as that of the first embodiment except that it is changed.
As shown in FIG. 10, in the present embodiment, since the void blocking material is insoluble in the resin solution, it is possible to prevent the void blocking material from being dissolved in the resin solution of the slurry supplied to the next layer (n + 1th layer). Since the fluid has a higher specific gravity than the resin solution, it is possible to prevent the void blocking material and the resin solution from mixing and segregating the void closing material.

According to the method for producing a three-dimensional object of the present invention and the apparatus for producing a three-dimensional object of the present invention, a flat particle-containing layer can be formed in the production of a slurry-type three-dimensional object, so that a complicated three-dimensional shape can be formed. It is possible to easily and efficiently manufacture the modeled product of No. 1 with high dimensional accuracy without losing its shape before sintering or the like. The three-dimensional model obtained by the three-dimensional model manufacturing apparatus and the three-dimensional model manufacturing method of the present invention has sufficient strength, excellent dimensional accuracy, and can reproduce fine irregularities, curved surfaces, etc., and thus has an aesthetic appearance. It is also excellent in quality and has high quality, and is suitable for various purposes.
Examples of aspects of the present invention are as follows.
<1> A layer forming means for forming a particle-containing layer using a resin solution containing particles, and
A curing means for curing the modeling region in the particle-containing layer,
A void blocking material imparting means for applying a void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the cured particle-containing layer.
It is a three-dimensional model manufacturing apparatus characterized by having.
<2> The apparatus for manufacturing a three-dimensional model according to <1>, wherein the void closing material is a fluid that is insoluble in the resin solution and is hardly volatile.
<3> The apparatus for producing a three-dimensional model according to <1>, wherein the void closing material is a fluid that is insoluble in the resin solution and has a viscosity of 300 mPa · s or more.
<4> The apparatus for producing a three-dimensional model according to <1>, wherein the void blocking material is a fluid that is insoluble in the resin solution and volatilizes to form a film.
<5> The apparatus for producing a three-dimensional model according to <1>, wherein the void closing material is a fluid that is insoluble in the resin solution and has a higher specific gravity than the resin solution.
<6> The apparatus for manufacturing a three-dimensional model according to any one of <1> to <5>, wherein the void blocking material contains void closing particles that close the voids on the exposed surface of the particle-containing layer. ..
<7> The apparatus for producing a three-dimensional model according to <6>, wherein the void-occluded particles are sintering aids.
<8> The apparatus for producing a three-dimensional model according to <6>, wherein the void-blocking particles have the same composition as the particles contained in the resin solution.
<9> The apparatus for manufacturing a three-dimensional model according to any one of <1> to <8>, wherein the void closing material applying means is an inkjet unit.
<10> A dissolution / removal means for dissolving and removing a non-modeled region in the particle-containing layer with a dissolution liquid is provided.
The void blocking material imparting means imparts the void blocking material to the formed region and the non-formed region in the particle-containing layer.
The apparatus for producing a three-dimensional model according to any one of <1> to <9>, wherein the void blocking material applied to the non-modeled region in the particle-containing layer is soluble in the solution.
<11> A layer forming step of forming a particle-containing layer using a resin solution containing particles, and
A curing step of curing the modeling region in the particle-containing layer, and
A void blocking material applying step of applying a void blocking material to the exposed surface of the particle-containing layer so as to fill the voids on the exposed surface of the cured particle-containing layer.
It is a method for manufacturing a three-dimensional model, which is characterized by including.
<12> The method for producing a three-dimensional model according to <11>, wherein the layer forming step, the curing step, and the void closing material applying step are performed a plurality of times in this order.

The method for manufacturing a three-dimensional model according to any one of <1> to <10> and the apparatus for manufacturing a three-dimensional model according to any one of <11> to <12> solve the above-mentioned problems in the prior art. However, the object of the present invention can be achieved.

Japanese Unexamined Patent Publication No. 2014-88046

10, 20, 30, 40, 50, 60, 70, 80 Manufacturing equipment for three-dimensional objects 21 Layer forming means (flattening member)
31 Hardening means (modeling unit)
32 Modeling liquid 41a, 41b Void blocking material applying means 42a, 42b, 42c, 42d, 42e Void closing material 101 Resin solution (slurry) supplying means containing particles 102 Support (stage)
Resin solution (slurry) containing 111 particles
112 Resin solution 113 Particles 114 Coating 121 Modeling area 122 Non-modeling area

Claims (12)

A layer forming means for forming a particle-containing layer using a resin solution containing particles, and
A curing means for curing the modeling region in the particle-containing layer,
A void blocking material imparting means for applying a void blocking material to the exposed surface of the particle-containing layer so as to close the voids on the exposed surface of the cured particle-containing layer.
A device for manufacturing a three-dimensional object, which is characterized by having. The apparatus for producing a three-dimensional model according to claim 1, wherein the void closing material is a fluid that is insoluble in the resin solution and is hardly volatile. The apparatus for producing a three-dimensional model according to claim 1, wherein the void closing material is a fluid that is insoluble in the resin solution and has a viscosity of 300 mPa · s or more. The apparatus for producing a three-dimensional model according to claim 1, wherein the void closing material is a fluid that is insoluble in the resin solution and volatilizes to form a film. The apparatus for manufacturing a three-dimensional model according to claim 1, wherein the void closing material is a fluid that is insoluble in the resin solution and has a higher specific gravity than the resin solution. The apparatus for manufacturing a three-dimensional model according to any one of claims 1 to 5, wherein the void blocking material contains void closing particles that close the voids on the exposed surface of the particle-containing layer. The apparatus for manufacturing a three-dimensional model according to claim 6, wherein the void-blocking particles are sintering aids. The apparatus for producing a three-dimensional model according to claim 6, wherein the void-blocking particles have the same composition as the particles contained in the resin solution. The apparatus for manufacturing a three-dimensional model according to any one of claims 1 to 8, wherein the void closing material applying means is an inkjet unit. It has a dissolution / removal means for dissolving and removing a non-molded region in the particle-containing layer with a dissolution solution.
The void blocking material imparting means imparts the void blocking material to the formed region and the non-formed region in the particle-containing layer.
The apparatus for producing a three-dimensional model according to any one of claims 1 to 9, wherein the void blocking material applied to the non-modeled region in the particle-containing layer is soluble in the solution. A layer forming step of forming a particle-containing layer using a resin solution containing particles, and
A curing step of curing the modeling region in the particle-containing layer, and
A void blocking material applying step of applying a void blocking material to the exposed surface of the particle-containing layer so as to fill the voids on the exposed surface of the cured particle-containing layer.
A method for manufacturing a three-dimensional model, which comprises. The method for producing a three-dimensional model according to claim 11, wherein the layer forming step, the curing step, and the void closing material applying step are performed a plurality of times in this order.