JP7451952B2 - Three-dimensional object manufacturing device, three-dimensional object manufacturing method, and discharge program for three-dimensional object manufacturing - Google Patents

Description

The present invention relates to a three-dimensional object manufacturing apparatus, a three-dimensional object manufacturing method, and a discharge program for three-dimensional object manufacturing.

Conventionally, as a three-dimensional object manufacturing device that forms a three-dimensional object (three-dimensional object), a three-dimensional object (three-dimensional object) is manufactured by discharging a modeling material that forms a three-dimensional object into a modeling area and then curing it to form a layered object. 2. Description of the Related Art A material injection modeling method (material jetting method) is known in which three-dimensional objects are created by sequentially stacking objects.

In such a material jetting (MJ) method, the purpose is to form a unit layer of a three-dimensional object satisfactorily even if a droplet ejection failure occurs. A pixel array is formed by assigning a different area of the nozzle array to each of the pixel groups divided into groups (n≧2, an integer), and the nozzles in each area forming one pixel group. A three-dimensional object modeling method including steps has been proposed (see, for example, Patent Document 1).

The present invention is capable of achieving high resolution without increasing the number of ejection holes in a method of applying modeling material in layers and laminating them to create a three-dimensional object, preferably a material jetting method. An object of the present invention is to provide a three-dimensional object manufacturing apparatus that can produce a three-dimensional object with excellent surface properties.

The three-dimensional object manufacturing apparatus of the present invention as a means for achieving the above object has a plurality of first, second, ... n-th ejection holes in the sub-scanning direction, and a plurality of ejection holes from the plurality of ejection holes. A discharging means for discharging a modeling material, a curing means for curing the modeling material discharged by the discharging means, a normal printing process for performing normal printing in a plurality of lines, and an interlace for the normal printing in a plurality of lines. and a control unit that performs interlace printing processing for printing.

According to the present invention, high resolution can be achieved without increasing the number of ejection holes in a method of applying modeling material in layers and laminating them to create a three-dimensional object, preferably a material jetting method. At the same time, it is possible to provide a three-dimensional object manufacturing apparatus that can obtain a three-dimensional object with excellent surface properties.

FIG. 1 is a schematic diagram showing an example of a three-dimensional object manufacturing apparatus of the present invention. FIG. 2 is a block diagram showing an example of a control means of the three-dimensional object manufacturing apparatus. FIG. 3A shows a diagram in which, in the prior art, when printing an object with high resolution, the ejection means is moved in the sub-scanning direction at the same vertical height, and the ejection means is adjacent to the ejection of the M-th column of printing material in the main scanning direction. FIG. 7 is a schematic diagram showing how scanning is performed multiple times so as to fill in the interlace with the discharge of the M-th column of modeling material. FIG. 3B is a schematic diagram showing a side view of the object formed in FIG. 3A. FIG. 4A shows that in the prior art, when printing a model with a resolution higher than the resolution of the ejection holes, after ejecting the modeling material in the forward and return passes at the same vertical height in the first scan, A line break is performed, and the second scan shows how the printing material is ejected in the forward and backward passes so as to fill the interlace between the ejection of the printing material in the Mth column in the main scanning direction and the ejection of the printing material in the adjacent Mth column. It is a schematic diagram. FIG. 4B is a schematic diagram showing a side view of the object formed in FIG. 4A. FIG. 5 is a photograph showing that a "Y level difference" occurs in the modeled object formed by the method of FIG. 4A. FIG. 6A is a schematic diagram illustrating a method of modeling a shaped object in Example 1. FIG. 6B is a schematic diagram showing a side view of the modeled object formed by the method of FIG. 6A. FIG. 7 shows that after performing the modeling process multiple times, the ejection means is moved in the sub-scanning direction so that the center of the first ejection hole is placed at a position 1/2X from the ejection position at the start of modeling. It is a schematic diagram showing control. FIG. 8 shows that after performing the modeling process a plurality of times, the ejection means is sub-scanned so that the center of the first ejection hole is placed at a position that is 1/3X and 2/3X from the ejection position at the start of modeling. It is a schematic diagram showing control to move in the direction. FIG. 9A is a schematic diagram illustrating a method of modeling a shaped article in Example 2. FIG. 9B is a schematic diagram showing a side view of a modeled object formed by the method of FIG. 9A. FIG. 10A is a schematic diagram illustrating an example of a stacking method of alternately stacking the discharge of the M-th column of modeling material and the discharge of the M+1-column of modeling material in the main scanning direction. FIG. 10B is a schematic diagram showing an example of a lamination method in which the N+2 layer discharges the M+1 row of modeling material in the main scanning direction, and the N+3 layer discharges the M row of modeling material in the main scanning direction. be. FIG. 11 is a schematic diagram showing an example of a three-dimensional object manufacturing apparatus used in Example 1. FIG. 12 is a flowchart showing an example of the processing flow of a discharge program for manufacturing a three-dimensional object in the control means of the three-dimensional object manufacturing apparatus according to the first embodiment. FIG. 13 is a flowchart showing an example of the processing flow of a discharge program for manufacturing a three-dimensional object in the control means of the three-dimensional object manufacturing apparatus according to the second embodiment. FIG. 14A is a schematic diagram illustrating a method of modeling a shaped article in Comparative Example 1. FIG. 14B is a schematic diagram illustrating a side view of a modeled object formed by the modeling method of FIG. 14A. FIG. 15 is a flowchart showing an example of the processing flow of a discharge program for manufacturing a three-dimensional object in the control means of the three-dimensional object manufacturing apparatus of Comparative Example 1.

In the present invention, the discharging means reciprocates (hereinafter referred to as the discharging means and the The movement relative to the table is called "scanning"), and the modeling material is discharged in the forward and/or backward path. In order to improve productivity, the ejection means may have a plurality of ejection holes, and typically the ejection holes are arranged in a direction perpendicular to the main scanning direction (hereinafter referred to as the "sub-scanning direction" or "Y direction"). '') are lined up at regular intervals to form a line. In the present invention, "printing" refers to discharging a modeling material by a discharging means during reciprocating scanning in the main scanning direction and curing it by a curing means. The range that can be printed by one scan in the main scanning direction is called a "line", and moving the ejection means to a different line by scanning the ejection means in the sub-scanning direction is called a "line feed". As a general rule, the above-mentioned constant intervals between the ejection holes do not change even if a line feed is performed, and when printing is performed in the entire printing range by repeating line feeds, the above-mentioned constant intervals between the ejection holes are kept at constant intervals in the sub-scanning direction based on the ejection hole position at the start of printing. , the position of the ejection hole when forming a certain layer N is determined, and this determined position is used as the specified position when forming the Nth layer. In the present invention, "normal printing" means printing performed at a predetermined ejection hole position, such as the above-mentioned specified position. At this time, at the predetermined discharge hole position, the space between one discharge hole and another discharge hole adjacent to it is called an "interlace", and the discharge hole is placed at a position corresponding to the interlace (i.e., the interlace is filled). This type of printing is called "interlaced printing" in contrast to the above-mentioned normal printing.

(Three-dimensional object manufacturing device and method for manufacturing a three-dimensional object)
The three-dimensional object manufacturing apparatus of the present invention includes a plurality of first, second, ... n-th discharge holes in the sub-scanning direction, and a discharge means for discharging a modeling material from the plurality of discharge holes; A curing means for curing the modeling material discharged by the discharging means, a normal printing process in which normal printing is performed in a plurality of lines, and an interlaced printing process in which interlaced printing is performed with respect to the normal printing in a plurality of lines. control means, and further has other means as necessary.

The method for manufacturing a three-dimensional object of the present invention includes a normal printing process in which normal printing is performed in a plurality of lines, an interlaced printing process in which interlaced printing is performed with respect to the normal printing in a plurality of lines, and further as necessary. Including the process of

The method for manufacturing a three-dimensional object of the present invention can be suitably carried out by the three-dimensional object manufacturing apparatus of the present invention, the discharging step can be performed by a discharging means, the curing step can be performed by a curing means, The normal printing process and the interlaced printing process can be performed by a control means, and other processes performed as necessary are performed by a discharge means, a curing means, a control means, and/or other means that may be provided as necessary. be able to.

In the conventional technology (Patent Document 1), when an inkjet discharge failure or a missing nozzle occurs, the missing nozzle parts are lined up continuously in the main scanning direction, resulting in grooves in the main scanning direction being formed in the modeled object. In order to print a high-resolution model, the ejection means is moved in the sub-scanning direction (minor line feed) at the same vertical height to eject the M-th column of printing material in the main-scanning direction. When the M+1 column of printing material is discharged to fill the interlace between the discharging of the adjacent M column of printing material, a step (hereinafter referred to as "Y step") on the side surface parallel to the main scanning direction of the object is created. There is a problem in that the surface quality of the modeled object is poor. However, M represents an integer of 1 or more. The cause of the Y level difference is considered to be that the positioning accuracy of minute line breaks is poor, which causes variations in the ink landing positions in the sub-scanning direction. If the dispersion in the landing positions is large, it is thought that the bullets will land at positions different from the original landing positions, resulting in the objects not being stacked or the surface quality of the objects being deteriorated.

In the present invention, there is provided a discharge means having a plurality of first, second, ... n-th discharge holes in the sub-scanning direction, and discharges the modeling material from the plurality of discharge holes; A curing means for curing the modeling material, a normal printing process in which normal printing is performed in a plurality of lines, and an interlaced printing process in which interlace printing is performed in response to the normal printing in a plurality of lines are performed. Generally, when performing interlaced printing, if you try to perform interlaced printing immediately after normal printing, or normal printing immediately after interlaced printing, the ejection means is moved from the ejection position during previous printing by a distance smaller than the ejection hole interval in the sub-scanning direction. Since it is necessary to scan (hereinafter such a short distance scan in the sub-scanning direction may be referred to as a "minor line feed"), it is difficult to ensure high positioning accuracy. In the present invention, by performing normal printing or interlaced printing on multiple lines at once, the scanning distance in the sub-scanning direction is increased, so high positioning accuracy can be ensured when performing the next printing process, and the main By discharging the building material in the M+1 column so as to fill the interlace between the discharge of the building material in the M-th column in the scanning direction and the discharging of the adjacent M-column building material, a "Y step" is created in the modeled object. This can be prevented, and a shaped article with excellent surface properties can be obtained.
The ejection means has a plurality of first, second, . . . n-th ejection holes in the sub-scanning direction. The n represents an integer of 3 or more.
Either of the normal printing process and the interlaced printing process may be performed first. For example, normal printing processing may be performed first and then interlace printing processing may be performed, or interlace printing processing may be performed first and then normal printing processing may be performed.

In the present invention, the "modeling material" is a material used to model a three-dimensional model, and is typically a first modeling material (hereinafter referred to as "model material") for forming the three-dimensional model itself. ), a second modeling material (hereinafter sometimes referred to as a "support material") used when modeling overhang parts, detail parts, etc. In the present invention, the modeling material is typically a liquid because it is discharged from the discharge hole of the discharge means. In the present invention, a model layer formed of a model material may be particularly referred to as a "model layer", and a model layer formed of a support material may be particularly referred to as a "support layer".

In one aspect of the present invention, control is performed to perform one interlaced printing process for one normal printing process. In general, according to this aspect, the occurrence of "Y step" can be prevented by performing control with high positioning accuracy without performing "minor line feed" operation with poor positioning accuracy as in the conventional technology, and Improves surface properties of objects. Further, since it is possible to perform ejection with a resolution twice that of the ejection hole (for example, ejection with a resolution of 300 dpi from an ejection hole with a resolution of 150 dpi), it is possible to improve the modeling accuracy.

In another aspect of the present invention, control is performed to perform the interlaced printing process a plurality of times, for example, twice, three times, four times, etc., for one normal printing process. According to this aspect, by performing control with high positioning accuracy without performing the "minor line feed" operation with poor positioning accuracy, it is possible to prevent the occurrence of "Y step" and improve the surface quality of the modeled object. do. Furthermore, since it is possible to perform ejection with a resolution that is three times or more, for example, three times, four times, five times, etc., the resolution of the ejection holes, it is possible to improve the modeling accuracy.

In one aspect of the present invention, when normal printing processing is performed in the Nth layer, interlaced printing processing is performed in another layer. The N represents an integer of 1 or more.
According to this aspect, the normal printing process and the interlaced printing process can be performed as printing on separate layers, so there is no need to scan the same layer multiple times, and the number of scans per layer can be reduced. It is possible to reduce molding time and improve productivity.

In one aspect of the present invention, the discharging means reciprocates in the main scanning direction, and discharges the modeling material during each of the forward and backward movements, and the discharging means reciprocates in the main scanning direction, and discharges more modeling material during the backward movement than during the forward movement. A large amount of the modeling material is discharged. By ejecting a larger amount of ejection during the backward movement than the amount of ejection during the forward movement, it is possible to form sharp edges of the object.

One aspect of the present invention includes a flattening device that flattens the surface of the modeling material discharged by the discharge device. By having the flattening means, it is possible to ensure the accuracy and flatness of the average thickness of the modeling layer.

In one aspect of the present invention, the building material includes a first building material and a second building material, and after the first building material is discharged and cured to form the first building layer, the building material is discharged in the same vertical direction. The second modeling material is discharged at a position adjacent to the first modeling layer and hardened to form a second modeling layer. According to this aspect, by using two types of modeling materials, the first modeling material (model material) and the second modeling material (support material), it is theoretically difficult to create objects other than the three-dimensional object itself. It is possible to create overhangs and detailed parts that have a unique shape.

In one aspect of the invention, the second modeling material is a water-soluble modeling material. Since the support material as the second modeling material is water-soluble, the support layer formed by the support material can be easily removed with water after modeling is completed.
Here, "the second modeling material is water-soluble" means that 100 g or more of the second modeling material is dissolved in 1000 mL of water at 25°C. When the second modeling material dissolves, the water becomes cloudy and can be visually confirmed.

<Discharge process and discharge means>
The discharge process is a process of discharging the modeling material, and is performed by a discharge means.
The ejection means is not particularly limited as long as it is capable of ejecting the modeling material, and can be appropriately selected depending on the purpose, such as an ejection head.
The ejection head is not particularly limited and can be appropriately selected depending on the purpose, such as a piezoelectric element head, a thermal expansion head, and the like. Among these, piezoelectric element (piezo element) type heads are preferred.

<<Building materials>>
The modeling material is not particularly limited and can be selected as appropriate based on the performance required for configuring the main body for modeling the three-dimensional object (model part). For example, the first modeling material (model material ), etc. In addition, when a support part is used for shape support as necessary when modeling a three-dimensional object, a second modeling material (support material) for modeling the support part is also included in the modeling material. It will be done.
The model material is a material for modeling the parts that constitute the model section.
In the present invention, the model section refers to a section that constitutes a main body for modeling a three-dimensional object, and is formed by laminating model layers.

In the present invention, the support section refers to a section that holds the three-dimensional object in a predetermined position until the model section is solidified, and is modeled by laminating support layers. The support part means, for example, a part that is disposed at a part that supports the model part in the direction of gravity, contacts the model part, and supports the model part from below. In the production of a three-dimensional object, the support section is usually finally peeled off from the model section, and the three-dimensional object consists of only the model section.
In a preferred embodiment, the support material is of a material (composition, concentration, etc.) different from that of the model material, and the cured material of the support material is more preferably water-soluble, deliquescent, collapsible, etc., so that it easily peels off from the model part. It has properties.

The modeling material is not particularly limited as long as it is a liquid material that hardens by applying energy such as light or heat, and can be selected as appropriate depending on the purpose, but materials including polymerizable monomers and polymerizable oligomers , further containing other ingredients as necessary. Among these, materials having liquid physical properties such as viscosity and surface tension that can be ejected by a modeling material ejection head used in a modeling material jet printer or the like are preferred.

-Polymerizable monomer-
Examples of the polymerizable monomer include monofunctional monomers and polyfunctional monomers. These may be used alone or in combination of two or more.

--Monofunctional monomer--
Examples of monofunctional monomers include acrylamide, N-substituted acrylamide derivatives, N,N-disubstituted acrylamide derivatives, N-substituted methacrylamide derivatives, N,N-disubstituted methacrylamide derivatives, and acrylic acid. These may be used alone or in combination of two or more. Among these, acrylamide, N,N-dimethylacrylamide, N-isopropylacrylamide, acryloylmorpholine, hydroxyethylacrylamide, and isobornyl (meth)acrylate are preferred.

The content of the monofunctional monomer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.5% by mass or more and 90% by mass or less based on the total amount of the modeling material.

Monofunctional monomers other than those mentioned above are not particularly limited and can be selected as appropriate depending on the purpose. For example, 2-ethylhexyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth) ) acrylate, caprolactone-modified tetrahydrofurfuryl (meth)acrylate, 3-methoxybutyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, lauryl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, isodecyl (meth)acrylate , isooctyl (meth)acrylate, tridecyl (meth)acrylate, caprolactone (meth)acrylate, ethoxylated nonylphenol (meth)acrylate, and the like. These may be used alone or in combination of two or more.

--Polyfunctional monomer--
The polyfunctional monomer is not particularly limited and can be appropriately selected depending on the purpose, and includes, for example, bifunctional monomers, trifunctional or higher functional monomers, and the like. These may be used alone or in combination of two or more.

Examples of difunctional monomers include tripropylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, and neopentyl glycol hydroxypivalate di(meth)acrylate. (meth)acrylate, hydroxypivalic acid neopentyl glycol ester di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di( meth)acrylate, 1,9-nonanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, caprolactone-modified hydroxypivalic acid neopentyl glycol ester Examples include di(meth)acrylate, propoxylated opentyl glycol di(meth)acrylate, ethoxy-modified bisphenol A di(meth)acrylate, polyethylene glycol 200 di(meth)acrylate, polyethylene glycol 400 di(meth)acrylate, and the like. These may be used alone or in combination of two or more.

Examples of trifunctional or higher-functional monomers include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, triallylisocyanurate, and ε-caprolactone-modified dipentaerythritol tri(meth)acrylate. meth)acrylate, ε-caprolactone modified dipentaerythritol tetra(meth)acrylate, ε-caprolactone modified dipentaerythritol penta(meth)acrylate, ε-caprolactone modified dipentaerythritol hexa(meth)acrylate, tris(2-hydroxyethyl) Isocyanurate tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, propoxylated glyceryl tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, ditrimethylolpropane Examples include tetra(meth)acrylate, dipentaerythritol hydroxypenta(meth)acrylate, ethoxylated pentaerythritol tetra(meth)acrylate, and penta(meth)acrylate ester. These may be used alone or in combination of two or more.

-Polymerizable oligomer-
As the polymerizable oligomer, a low polymer of the above-mentioned monofunctional monomer or one having a reactive unsaturated bond group at the terminal may be used alone, or two or more types may be used in combination.

-Other ingredients-
Other components are not particularly limited and can be selected as appropriate depending on the purpose, such as surfactants, polymerization inhibitors, polymerization initiators, colorants, viscosity modifiers, adhesion agents, antioxidants, etc. agents, anti-aging agents, crosslinking accelerators, ultraviolet absorbers, plasticizers, preservatives, dispersants and the like.

--Surfactant--
Examples of surfactants include molecular weights of 200 or more and 5,000 or less, specifically, PEG type nonionic surfactants [ethylene oxide (hereinafter abbreviated as "EO") 1 to 40 mole adduct of nonylphenol; Stearic acid EO 1-40 mole adduct, etc.], polyhydric alcohol type nonionic surfactants (e.g., sorbitan palmitate monoester, sorbitan stearate monoester, sorbitan stearate triester, etc.), fluorine-containing surfactants ( For example, perfluoroalkyl EO 1 to 50 mole adduct, perfluoroalkyl carboxylate, perfluoroalkyl betaine, etc.), modified silicone oil [for example, polyether modified silicone oil, (meth)acrylate modified silicone oil, etc.] Can be mentioned. These may be used alone or in combination of two or more.
The content of the surfactant is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 3% by mass or less, and 0.1% by mass or more and 5% by mass or less based on the total amount of the modeling material. is more preferable.

--Polymerization inhibitor--
Examples of polymerization inhibitors include phenolic compounds [hydroquinone, hydroquinone monomethyl ether, 2,6-di-t-butyl-p-cresol, 2,2-methylene-bis-(4-methyl-6-t-butylphenol)] , 1,1,3-tris-(2-methyl-4-hydroxy-5-t-butylphenyl)butane, etc.], sulfur compounds [dilaurylthiodipropionate, etc.], phosphorus compounds [triphenylphosphite, etc.] , amine compounds [phenothiazine, etc.], and the like. These may be used alone or in combination of two or more.
The content of the polymerization inhibitor is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 5% by mass or less, and 0.1% by mass or more and 5% by mass or less based on the total amount of the modeling material. is more preferable.

--Polymerization initiator--
Examples of the polymerization initiator include thermal polymerization initiators, photopolymerization initiators, and the like. Among these, photopolymerization initiators are preferred from the viewpoint of storage stability.
As the photopolymerization initiator, any substance that generates radicals upon irradiation with light (particularly ultraviolet light with a wavelength of 220 nm to 400 nm) can be used.
Examples of the photopolymerization initiator include acetophenone, 2,2-diethoxyacetophenone, p-dimethylaminoacetophenone, benzophenone, 2-chlorobenzophenone, p,p'-dichlorobenzophenone, p,p-bisdiethylaminobenzophenone, Michler's ketone, Benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-propyl ether, benzoin isobutyl ether, benzoin-n-butyl ether, benzyl methyl ketal, thioxanthone, 2-chlorothioxanthone, 2-hydroxy-2- Methyl-1-phenyl-1-one, 1-(4-isopropylphenyl)2-hydroxy-2-methylpropan-1-one, methylbenzoylformate, 1-hydroxycyclohexylphenyl ketone, azobisisobutyronitrile, Examples include benzoyl peroxide and di-tert-butyl peroxide. These may be used alone or in combination of two or more.

The thermal polymerization initiator is not particularly limited and can be appropriately selected depending on the purpose, such as an azo initiator, a peroxide initiator, a persulfate initiator, a redox (redox) initiator, etc. can be mentioned.

Examples of the azo initiator include VA-044, VA-46B, V-50, VA-057, VA-061, VA-067, VA-086, 2,2'-azobis(4-methoxy-2, 4-dimethylvaleronitrile) (VAZO 33), 2,2'-azobis(2-amidinopropane) dihydrochloride (VAZO 50), 2,2'-azobis(2,4-dimethylvaleronitrile) (VAZO 52) , 2,2'-azobis(isobutyronitrile) (VAZO 64), 2,2'-azobis-2-methylbutyronitrile (VAZO 67), 1,1-azobis(1-cyclohexanecarbonitrile) (VAZO 88) (manufactured by DuPont Chemical), 2,2'-azobis(2-cyclopropylpropionitrile), 2,2'-azobis(methylisobutyrate) (V-601) (manufactured by Wako Pure Chemical Industries, Ltd.) Co., Ltd.).

Examples of peroxide initiators include benzoyl peroxide, acetyl peroxide, lauroyl peroxide, decanoyl peroxide, dicetyl peroxydicarbonate, and di(4-t-butylcyclohexyl) peroxydicarbonate (trade name: Perkadox 16S, manufactured by Akzo Nobel), di(2-ethylhexyl) peroxydicarbonate, t-butylperoxypivalate (product name: Lupersol 11, manufactured by Elf Atochem), t-butylperoxy-2-ethylhexane Examples include Noate (trade name: Trigonox 21-C50, manufactured by Akzo Nobel), dicumyl peroxide, and the like.

Examples of persulfate initiators include potassium persulfate, sodium persulfate, ammonium persulfate, and the like.

Redox initiators include, for example, combinations of persulfate initiators and reducing agents such as sodium metabisulfite and sodium bisulfite, systems based on organic peroxides and tertiary amines (e.g. , a system based on benzoyl peroxide and dimethylaniline), a system based on an organic hydroperoxide and a transition metal (for example, a system based on cumene hydroperoxide and cobalt naphthate), and the like.

The content of the polymerization initiator is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 10% by mass or less, more preferably 5% by mass or less, based on the total amount of the modeling material.

--Coloring agent--
As the coloring agent, dyes and pigments that can be dissolved or stably dispersed in the modeling material and have excellent thermal stability are suitable. Among these, soluble dyes are preferred. Moreover, it is possible to mix two or more types of colorants as appropriate for color adjustment and the like.

<Curing process and curing means>
The curing step is a step of irradiating active energy rays for curing the modeling material discharged in the discharging step, and is carried out by a curing means.
Examples of active energy rays include ultraviolet rays, electron beams, α rays, β rays, γ rays, and X rays. Among these, ultraviolet light is preferred.
The curing means is not particularly limited as long as it can harden the discharged modeling material, and can be appropriately selected depending on the purpose, such as an ultraviolet irradiation device.

Examples of the ultraviolet irradiation device include a light-emitting diode (LED), a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, and a metal halide. Among these, LEDs are particularly preferable because the irradiation intensity can be changed.
A high-pressure mercury lamp is a point light source, but the Deep UV type, which increases light utilization efficiency in combination with an optical system, can irradiate in a short wavelength region.
Metal halides are effective for colored materials because of their wide wavelength range, and halides of metals such as Pb, Sn, and Fe are used and can be selected according to the absorption spectrum of the polymerization initiator. The lamp used for curing is not particularly limited and can be selected as appropriate depending on the purpose. For example, commercially available lamps such as H lamp, D lamp, or V lamp manufactured by Fusion System may also be used. can be used.

<Normal printing process, interlaced printing process, control means>
The control means controls the ejection means and/or the curing means and/or other means so as to eject and/or cure the modeling material based on a predetermined method in the ejection step and/or the curing step. It is a means to do so. The control means may include a storage means for storing a control program and the like, a calculation means for calling and calculating the program stored in the storage means, and the like.
In the present invention, "control means" means means for controlling the operation of the ejection means, the curing means, and other means (for example, the flattening means, etc.). A functional block diagram of the control means is shown in FIG. 2, and details of the control means will be described later based on specific examples. The control means may include storage means such as ROM and RAM, and calculation means such as CPU and FPGA. The storage means may store a program for causing each means such as the ejection means and the curing means to perform a specific operation, and the operation of each means is controlled based on the program.
In the present invention, when each means such as the discharging means and the curing means is operated by the control means, when each means moves in a predetermined direction, such movement is relative to the modeling table (or three-dimensional object). It means moving. Therefore, for example, when it is said that "the ejection means moves in the main scanning direction", the ejection means itself may move in the main scanning direction, or by moving the modeling table (or three-dimensional object) in the main scanning direction, The ejection means may be controlled to move relatively in the main scanning direction.
The normal printing process is a process of performing normal printing on multiple lines, and the interlaced printing process is a process of performing interlaced printing in contrast to the normal printing on multiple lines. In both processes, the control means controls the operation of each means. It is implemented by controlling.
By performing normal printing or interlaced printing on multiple lines at once through the function of the control means, the scanning distance in the sub-scanning direction becomes larger, making it possible to ensure high positioning accuracy when performing the next printing process. , by discharging the building material in the M+1 column so as to fill the interlace between the discharge of the building material in the M-th column in the main scanning direction and the discharging of the adjacent M-column building material, a "Y step" is created in the modeled object. It is possible to prevent the occurrence of blemishes and obtain a shaped article with excellent surface properties.
The control means may include a storage means for storing a control program and the like, a calculation means for calling and calculating the program stored in the storage means, and the like.

The storage means that can be included in the control means is not particularly limited and can be selected as appropriate depending on the purpose.For example, in addition to main storage devices such as RAM (Random Access Memory) and ROM (Read Only Memory), Examples include auxiliary storage devices such as HDD (Hard Disk Drive) and SDD (Solid State Drive).
The calculation means that can be included in the control means is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a CPU (Central Processing Unit) and an FPGA (Field Programmable Gate Array).

<Other processes and other means>
Other steps are not particularly limited and can be appropriately selected depending on the purpose, and include, for example, a flattening step, a drying step, and the like.
Other means are not particularly limited and can be appropriately selected depending on the purpose, and include, for example, a flattening means, a drying means, a stage, and the like.

- Flattening process and flattening means -
The planarization step is a step of planarizing the shaped layer formed by the discharge step, and is performed by a planarization means.
Examples of the flattening means include rollers, brushes, blades, and the like.
By flattening the modeling material by the flattening means, it is possible to ensure the accuracy and flatness of the average thickness of the modeling layer.

-stage-
The stage means a base on which modeling layers are stacked to form a three-dimensional object.
The stage may be movable by a motor or the like, or may be movable up and down. Note that the "stage" may be referred to as a "modeling stage" or "modeling table."
The shape of the stage is not particularly limited and can be appropriately selected depending on the purpose, but is preferably planar.

Here, the three-dimensional object manufacturing apparatus of the present invention will be explained in detail with reference to the drawings.
In addition, in each drawing, the same components are given the same reference numerals, and duplicate explanations may be omitted. Further, the number, position, shape, etc. of the following constituent members are not limited to this embodiment, and can be set to a preferable number, position, shape, etc. for implementing the present invention.

FIG. 1 is a schematic diagram showing an example of a three-dimensional object manufacturing apparatus of the present invention. The three-dimensional object manufacturing apparatus 10 of FIG. 1 includes a stage 14, which is a modeling stage in which building layers 30, which are layered objects, are laminated to form a three-dimensional object, and a stage 14, which is a modeling stage in which building layers 30, which are layered objects, are stacked, and the building layers 30 are sequentially stacked on the stage 14. It is equipped with a modeling unit 20 that performs modeling while printing.

The modeling unit 20 includes a first head 11 serving as a discharge means for discharging a modeling material onto a unit holder 21, a UV irradiation unit 13 for irradiating ultraviolet rays as active energy rays, and a flattening means for flattening the modeling layer 30. A flattening roller 16 is provided. Note that the second head 12 can be provided for discharging not only a modeling material as a model material for modeling a three-dimensional object, but also a support material that supports the modeling of a three-dimensional object.

Here, in the X direction, two second heads 12 are arranged with the first head 11 in between, a UV irradiation unit 13 is arranged outside each of the two second heads 12, and further, an outside of the UV irradiation unit 13 is arranged. A flattening roller 16 is disposed as a flattening member in each of the areas.

The first head 11 is supplied with modeling material via a supply tube or the like by a cartridge that is replaceably mounted on a cartridge mounting section. Note that when using a color modeling material such as black, cyan, magenta, or yellow, a plurality of nozzle rows for ejecting droplets of each color can be arranged in the first head 11.

The UV irradiation unit 13 cures the modeling material discharged from the first head 11. Further, when the UV irradiation unit 13 includes a support material, the modeling layer 30 made of the support material discharged from the second head 12 is cured.
Examples of the UV irradiation unit 13 include a light emitting diode (LED), an ultraviolet irradiation lamp, and the like. When using an ultraviolet irradiation lamp, it is preferable to include a mechanism for removing ozone generated by ultraviolet irradiation.
Examples of the types of ultraviolet irradiation lamps include high-pressure mercury lamps, ultra-high-pressure mercury lamps, and metal halides. Ultra-high-pressure mercury lamps are point light sources, but ultraviolet irradiation lamps that are combined with optical systems to increase light utilization efficiency can irradiate in the short wavelength range. Metal halides have a wide wavelength range and are therefore effective in curing colored materials. Metal halides such as Pb, Sn, and Fe are used and can be selected depending on the absorption spectrum of the photopolymerization initiator.

The flattening roller 16 flattens the surface of the modeling layer 30 hardened on the stage 14 by moving relative to the stage 14 while being rotated.
In addition, "on the stage 14" means including the stage 14 and the modeling layer 30 laminated|stacked on the stage 14, unless specifically limited.

The unit holder 21 of the modeling unit 20 is movably held by a guide member arranged in the X direction.
Further, a maintenance mechanism for maintaining and recovering the first head 11 is arranged on one side of the modeling unit 20 in the X direction.

Moreover, the guide member holding the unit holder 21 of the modeling unit 20 is held by the side plates on both sides. The side plate has a slider portion movably held by a guide member disposed on the base member, and the modeling unit 20 can reciprocate in the Y direction orthogonal to the X direction.
The stage 14 is raised and lowered in the Z direction by a lifting means 15. The elevating means 15 is movably arranged on a guide member arranged in the X direction on the base member.

Next, an overview of the modeling operation by this three-dimensional object manufacturing apparatus 10 will be explained with reference to FIG. 1.
First, the modeling unit 20 is moved in the Y direction and positioned on the stage 14. Next, while moving the stage 14 relative to the stopped modeling unit 20, the model material 301 is discharged from the first head 11 into a modeling area (an area that constitutes a three-dimensional object). When using a support material, the support material 302 is discharged from the second head 12 to a support region other than the modeling region (a region to be removed after modeling).

Next, the UV irradiation unit 13 irradiates and cures the model material 301 and the support material 302 with ultraviolet rays, thereby forming one modeling layer 30 including the model material 17 made of the material and the support material 18 made of the material. do.

This modeling layer 30 is repeatedly modeled and layered one after another, and a target three-dimensional object made of the model material 301 is modeled while supporting the model material 301 with the support material 302. For example, the example in FIG. 1 shows a state in which five modeling layers 30A to 30E are laminated.

Here, every time a plurality of building layers 30 (not necessarily a fixed value) are stacked, for example, every time 10 layers are stacked, the flattening roller 16 is pressed against the outermost building layer 30 to flatten it. This ensures the thickness accuracy and flatness of the modeling layer 30.
When using a roller-shaped member such as the flattening roller 16 as the flattening means, the flattening effect is improved by rotating the flattening roller 16 in a direction that is reverse to the direction of movement in the X direction. be able to.

Moreover, in order to keep the gap between the modeling unit 20 and the outermost modeling layer 30 constant, the stage 14 is lowered by the lifting means 15 every time one modeling layer 30 is formed. Note that a configuration in which the modeling unit 20 is moved up and down may also be used.

The three-dimensional object manufacturing apparatus may include a collection member for the model material 301 and the support material 302, a recycling mechanism, and the like. Further, an ejection state detection means for detecting non-ejection nozzles of the first head 11 and the second head 12 may be provided. Furthermore, the environmental temperature within the apparatus during modeling may be controlled.

(Discharge program for manufacturing three-dimensional objects)
The ejection program for manufacturing a three-dimensional object of the present invention causes a computer to perform normal printing processing in which normal printing is performed in a plurality of lines, and interlaced printing processing in which interlaced printing is performed with respect to the normal printing in a plurality of lines.

The ejection program for manufacturing a three-dimensional object can cause a computer to perform other processes in addition to the above-mentioned processes.
Other treatments include, for example, a process of flattening the layer of the ejected modeling material, a process of irradiating active energy rays to harden the ejected modeling material, a process of cleaning the modeled object, and a process of cleaning the modeled object. Examples include drying the shaped object.

The ejection program for manufacturing a three-dimensional object of the present invention is realized as the three-dimensional object manufacturing apparatus of the invention by using a computer or the like as a hardware resource, so it is suitable for the ejection program for manufacturing a three-dimensional object of the present invention. This aspect can be, for example, the same as the preferred aspect of the three-dimensional object manufacturing apparatus of the present invention.

The ejection program for manufacturing a three-dimensional object of the present invention can be created using various known programming languages depending on the configuration of the computer system used, the type and version of the operating system, etc.

The ejection program for manufacturing a three-dimensional object of the present invention may be recorded on a recording medium such as a built-in hard disk or an external hard disk, or may be recorded on a recording medium such as a CD-ROM, DVD-ROM, MO disk, or USB memory. You may record it. These recording media may be storage means included in the control means.
Furthermore, when recording the ejection program for manufacturing a three-dimensional object of the present invention on the above-mentioned recording medium, it can be used directly or by installing it on a hard disk through a recording medium reading device included in the computer system, as necessary. can do. Further, the ejection program for manufacturing a three-dimensional object of the present invention may be recorded in an external storage area (such as another computer) that can be accessed from the computer system through an information communication network. In this case, the ejection program for producing a three-dimensional object of the present invention recorded in the external storage area can be used directly from the external storage area via an information communication network or by installing it on a hard disk, as necessary. .
Note that the ejection program for manufacturing a three-dimensional object of the present invention may be divided and recorded on a plurality of recording media for each arbitrary process.

<Three-dimensional object manufacturing device>
The three-dimensional object manufacturing apparatus of the present invention is equipped with the three-dimensional object manufacturing discharge program of the present invention.
The three-dimensional object manufacturing apparatus of the present invention is not particularly limited except that it is equipped with the three-dimensional object manufacturing discharge program of the present invention, and other programs can be installed therein.

<Computer-readable recording medium>
A computer-readable recording medium according to the present invention records the ejection program for manufacturing a three-dimensional object according to the present invention.
The computer-readable recording medium in the present invention is not particularly limited and can be appropriately selected depending on the purpose, such as a built-in hard disk, an external hard disk, a CD-ROM, a DVD-ROM, an MO disk, and a USB. Examples include memory.
Moreover, the computer-readable recording medium in the present invention may be a plurality of recording media on which the active energy ray irradiation program for producing a three-dimensional object according to the present invention is divided and recorded for each arbitrary process.

Processing by the discharge program for manufacturing a three-dimensional object of the present invention can be executed using a computer having a control means that constitutes the three-dimensional object manufacturing apparatus of the present invention.
The computer is not particularly limited as long as it is equipped with devices for storage, calculation, control, etc., and can be appropriately selected depending on the purpose, such as a personal computer.

Here, an overview of the control means of the three-dimensional object manufacturing apparatus will be explained with reference to FIG. 2. FIG. 2 is a block diagram of the control means of the three-dimensional object manufacturing apparatus.

The control means 500 includes a CPU 501 that controls the entire three-dimensional object manufacturing apparatus, a ROM 502 that stores the discharge program for manufacturing the three-dimensional object of the present invention and other fixed data in the CPU 501, and a RAM 503 that temporarily stores modeling data and the like. The main control unit 500A includes:
The control means 500 also includes a non-volatile memory (NVRAM) 504 for retaining data even when the power of the device is cut off. Further, the control means 500 includes an ASIC 505 that processes image processing that performs various signal processing on image data and other input/output signals for controlling the entire apparatus.
Further, the control means 500 includes an I/F 506 for transmitting and receiving data and signals used when receiving modeling data from an external modeling data creation device 600.
Note that the modeling data creation device 600 is a device that creates modeling data (cross-sectional data) that is slice data obtained by slicing the final form of the object (three-dimensional object) for each formation layer, and is an information processing device such as a personal computer. It consists of

The control means 500 includes an I/O 507 for receiving detection signals from various sensors.
Further, the control means 500 includes a head drive control section 508 that drives and controls the first head 11 of the modeling unit 20, and a head drive control section 509 that drives and controls the second head 12.
Further, the control means 500 includes a motor drive unit 510 that drives a motor that constitutes a unit X-direction moving mechanism 550 that moves the modeling unit 20 in the A motor drive section 511 that drives a motor constituting the direction scanning mechanism 552 is provided.

The control means 500 constitutes a motor drive section 513 that drives a motor that constitutes a stage X-direction scanning mechanism 553 that moves the stage 14 in the X direction together with the elevating means 15, and an elevating means 15 that moves the stage 14 up and down in the Z direction. A motor drive unit 514 that drives the motor is provided. In addition, raising and lowering in the Z direction can also be configured such that the modeling unit 20 is raised and lowered as described above.

The control means 500 includes a motor drive section 516 that drives the motor 26 that rotationally drives the flattening roller 16, and a maintenance drive section 518 that drives the maintenance mechanism 61 of the first head 11 and the second head 12.

The control means 500 includes a curing control section 519 that controls ultraviolet irradiation by the UV irradiation unit 13.
The I/O 507 of the control means 500 receives detection signals from a temperature/humidity sensor 560 that detects temperature and humidity as environmental conditions of the device, and detection signals from other sensors.
An operation panel 522 is connected to the control means 500 for inputting and displaying information necessary for this device.
The control means 500 receives modeling data from the modeling data creation device 600, as described above. The modeling data is data for forming the object 17 in each object layer 30 (data of the object region) as slice data obtained by slicing the shape of the target three-dimensional object.

The main control unit 500A creates data by adding data of a support area to which a support material is applied to modeling data (printing area data), and provides the data to the head drive control units 508 and 509. The head drive control units 508 and 509 each cause the first head 11 to eject droplets of the model material 301 onto the modeling area, and the second head 12 to eject droplets of the liquid support material 302 onto the support area.
Note that a manufacturing device is configured by the modeling data creation device 600 and the three-dimensional object manufacturing device 10.

Here, as shown in FIG. 3A, in the conventional technology, when printing an object with a resolution higher than that of the nozzle, the nozzle is moved in the sub-scanning direction (minor line feed) at the same vertical height, and the main Scanning was performed multiple times so as to fill in the interlace between the discharge of the modeling material in the Mth column in the scanning direction and the discharge of the modeling material in the adjacent Mth column. A step (hereinafter sometimes referred to as "Y step") is generated on the side surface of the object shown in FIG. 3B, which is obtained by the method of manufacturing the three-dimensional object shown in FIG. 3A, parallel to the main scanning direction. If this "Y step" occurs, the surface quality of the completed model will deteriorate. Further, in the method of FIG. 3A, since scanning is performed multiple times at the same vertical height, there is a problem in that it takes a long time to build and the productivity is low.

As a result of intensive studies by the present inventors on the mechanism by which the "Y step" occurs in conventional methods for manufacturing three-dimensional objects, we found that in conventional methods for manufacturing three-dimensional objects, the stage or ejection means is moved in the sub-scanning direction. It was discovered that the positional accuracy when making small line breaks was poor.
That is, as shown in FIG. 4A, when ejecting with a resolution of 300 dpi from an ejection hole with a resolution of 150 dpi using a conventional method for manufacturing a three-dimensional object, (1) the first scan is performed at the same vertical height in the forward and outward directions; After discharging the modeling material on the return path, (2) shift the position of the dispensing means by half a dot in the sub-scanning direction (with a slight line feed), and then (3) perform the second scan in the main scan at the same vertical height position. The modeling material is discharged in the M+1 column so as to fill the interlace between the discharge of the modeling material in the M-th column in the direction and the discharge of the modeling material in the adjacent M-column. FIG. 4B is a schematic diagram showing a side view of the object formed in FIG. 4A. However, M represents an integer of 1 or more.
At this time, it was found that due to the poor positional accuracy of the above-mentioned "minor line feed" in (2), a "Y level difference" occurred in the modeled object, as shown in FIG.
Moreover, in the modeling method of FIG. 4A, since the same layer is scanned multiple times, the modeling time becomes long and productivity decreases.

In the present invention, the above-mentioned "minor line feed" operation with poor positioning accuracy is not performed, and modeling is performed using an operation with high positioning accuracy using the modeling method shown in FIG. 6A. That is, in the N-th layer, the M-th column of modeling material is first discharged in the main scanning direction (black modeling part in FIG. 6A) according to (1) to (3), and then the discharge means is discharged in the sub-scanning direction. The position of the M+1 column (in FIG. 6A) is changed to fill the interlace between the discharging of the building material in the M-th column in the main scanning direction and the discharging of the adjacent M-column building material in accordance with (4) to (6). Dispense the modeling material at the gray modeling area). By doing this, it is possible to improve the positioning accuracy by making large movements in the sub-scanning direction as shown in (3) to (4), rather than making small positional changes in the sub-scanning direction as shown in (1) to (4). As a result, the printing material can be ejected in the M+1th column so as to fill the interlace between the ejection of the printing material in the Mth column in the main scanning direction and the discharging of the printing material in the adjacent Mth column at the correct ejection position. Therefore, the occurrence of "Y step" can be prevented, and a three-dimensional object with excellent surface properties can be obtained. However, the above M and the above N represent an integer of 1 or more.

The above-mentioned control with high positioning accuracy does not require a slight positional change such as a half-dot positional change, and for example, there is a method in which normal printing is performed on a plurality of lines and then interlaced printing is performed.
Specifically, there is a method shown in FIG. 7 or 8. Here, X in the figure means the shortest distance between the center of the first discharge hole and the center of the second discharge hole adjacent to the first discharge hole.
In the method shown in FIG. 7, the control means, after performing the modeling process a plurality of times, arranges the center of the first ejection hole at a position equal to 1/2 x X at the ejection position at the start of modeling. In this method, the ejection means is scanned in the sub-scanning direction and the modeling process is performed a plurality of times.
In the method shown in FIG. 8, the control means, after performing the modeling process a plurality of times, arranges the center of the first ejection hole at a position equal to 1/3 x X of the ejection position at the start of modeling. After performing control to perform the modeling process a plurality of times by scanning the ejection means in the sub-scanning direction,
Control is performed to perform the modeling process a plurality of times by scanning the ejection means in a sub-scanning direction so that the center of the first ejection hole is located at a position of 2/3 × X in the ejection position at the start of modeling. This is a method of performing control.

However, in the printing method of the present invention shown in FIG. 6, the ejection means must be moved significantly in the sub-scanning direction in order to improve positioning accuracy, so it takes extra printing time compared to the printing method that performs minute line feeds. Productivity decreases accordingly.

Therefore, in the present invention, in the modeling of a certain layer (the Nth layer in the embodiment of FIG. 9), while discharging the M-th column of modeling material in the main scanning direction according to (1) to (3), The M+1-th column of modeling material that fills the interlace is discharged when another layer (the N+1-th layer in the embodiment of FIG. 9) is modeled.
According to this modeling method, it is possible to prevent the occurrence of "Y step" by performing control with high positioning accuracy without performing the "minor line feed" operation that has poor positioning accuracy as in the conventional technology. By printing a layer different from the layer normally printed during printing, there is no need to scan the same layer multiple times, and the number of scans per layer can be reduced, reducing printing time. , productivity can be improved.

When performing normal printing and interlaced printing on different layers, the lamination method is as follows: a layer for discharging the building material in the Mth column in the main scanning direction (regular printing layer), and a layer for discharging the building material in the M+1st column. (interlaced printing layer) should be repeated as a set. For example, if the ratio of normal printing and interlaced printing is 1:1, interlaced printing is applied on top of the normal printing layer as shown in Figure 10A. The pattern for forming the layers may be repeated, or the order of the normal printing layer and the interlaced printing layer may be reversed as shown in FIG. 10B.
For example, in FIG. 10A, the Nth layer discharges the Mth column of building material in the main scanning direction, the N+1th layer discharges the M+1th column of building material, and the next N+2th layer discharges the Mth column of building material. This is a method of alternately stacking the Mth column of modeling layers and the M+1th column of modeling layers so that they are discharged.
Further, for example, FIG. 10B shows a stacking method in which the modeling material of the M+1 column is discharged in the main scanning direction at the N+2 layer, and the modeling material of the M column is discharged from the N+3 layer.
Further, if the ratio of normal printing and interlaced printing is not 1:1, for example, if there are 1 normal printing and 3 interlaced printing, then one normal printing layer and three interlaced printing layers are repeated as a set. In this case, of course the order of each layer within the set may be any order. With this aspect, it is possible to obtain a modeled object having the same modeling accuracy without scanning the same layer multiple times.

Examples of the present invention will be described below, but the present invention is not limited to these Examples in any way. In the following Examples and Comparative Examples, examples are shown in which a model material is used as the modeling material, but the same applies even when a support material is used as the modeling material.

(Example 1)
The three-dimensional object manufacturing apparatus 200 used in Example 1 shown in FIG. We are prepared.

The modeling stage 111 is configured to be movable in the X direction, the Y direction, and the Z direction. Note that a configuration may also be adopted in which the modeling unit 120 is moved in the X direction. This makes it possible to realize forward and backward modeling operations.

The modeling unit 120 includes a first head 121 as a discharge means for discharging the model material 201 and a second head 122 as a discharge means for discharging the support material 202.

The modeling unit 120 includes a flattening roller 123 which is a flattening means for flattening the discharged model material 201 and the support material 202, and irradiates the model material 201 and the support material 202 with ultraviolet rays as active energy rays. It is equipped with two UV irradiation units 124A and 124B for curing.

Here, when the modeling stage 111 moves in the forward direction in the X direction, the flattening roller 123 is placed upstream of the first head 121, and the UV irradiation unit 124A is placed upstream of the flattening roller 123. . Similarly, the second head 122 is arranged downstream of the first head 121, and the UV irradiation unit 124B is arranged downstream of the second head 122.

In Example 1, as shown in FIG. 6A, the modeling unit 120 is moved in the sub-scanning direction multiple times each time one model layer is formed in the forward and return passes, and after all model layers are formed in the sub-scanning direction. , moves the modeling unit 120 to a predetermined position in the sub-scanning direction by performing an operation with high positioning accuracy, and discharges the modeling material in the M-th column and the adjacent M-th column in the main-scanning direction. The M+1 column of modeling material is discharged so as to fill the interlace. FIG. 6B is a schematic diagram showing a side view of the modeled object formed by the method of FIG. 6A.

Here, FIG. 12 is a flowchart showing an example of the processing flow of the discharge program for manufacturing a three-dimensional object in the control means of the three-dimensional object manufacturing apparatus of the first embodiment. Hereinafter, with reference to FIG. 6A, FIG. 6B, FIG. 7, and FIG. 11, the process flow of the method for manufacturing a three-dimensional object of Example 1 will be described.

In step S1, the control means of the three-dimensional object manufacturing apparatus 200 discharges a model material from the first head 121 by model scan 1 on the N layer in the outward path, irradiates it with ultraviolet rays from the UV irradiation unit 124B and cures it, thereby forming the model layer. form 1. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 2, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is irradiated with ultraviolet rays from the UV irradiation unit 124A to be cured. After forming the model layer 2, the process moves to S2.

In step S2, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S3.

In step S3, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 3 in the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to harden it to form the model layer 3. do. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 4, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 4, the process moves to S4.

In step S4, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process proceeds to S5.

In step S5, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 5 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it and form the model layer 5. . Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 6, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 6, the process moves to S6.

In step S6, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 to a predetermined position in the sub-scanning direction at the same vertical height, the process proceeds to S7.
Here, as shown in FIG. 7, the modeling unit 120 is moved in the sub-scanning direction so that the center of the first ejection hole is placed at a position equal to 1/2 x X in the ejection position at the start of printing. . However, the above-mentioned X means the shortest distance between the center of the first ejection hole and the center of the second ejection hole adjacent to the first ejection hole.

In step S7, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 7 in the N layer on the outward path, irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, and forms the model layer. form 7. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 8, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is irradiated with ultraviolet rays from the UV irradiation unit 124A to be cured. After forming the model layer 8, the process moves to S8.

In step S8, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S9.

In step S9, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 9 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 9. do. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 10, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 10, the process moves to S10.

In step S10, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S11.

In step S11, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 11 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124A to harden it to form the model layer 11. . Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 12, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is cured by being irradiated with ultraviolet rays from the UV irradiation unit 124B. Once the layer 12 is formed, the process moves to S12.

In step S12, when the control means of the three-dimensional object manufacturing apparatus 200 returns the position of the modeling unit 120 in the sub-scanning direction to the ejection position at the start of modeling, the process proceeds to S13.

In step S13, when the control means of the three-dimensional object manufacturing apparatus 200 raises the modeling unit 120 by a predetermined amount in the Z direction, this process ends. After this, the three-dimensional structure of Example 1 is obtained by repeating the series of processes from step S1 to step S13 a predetermined number of times.

In Embodiment 1, by performing control with high positioning accuracy, the M+1 column is filled in with the interlace between the discharging of the M-th column of printing material in the main scanning direction and the discharging of the adjacent M-column of printing material. Since the modeling material can be discharged, the occurrence of "Y step" can be prevented, and a molded article with excellent surface properties can be obtained.
However, in the first embodiment, when moving the ejection means from (3) the third scan to the (4) fourth scan, the ejection means must be moved largely in the sub-scanning direction. For this reason, in Example 1, there is a problem that extra modeling time is required and productivity is low.

(Example 2)
In Example 2, as shown in FIG. 9A, in the Nth layer, the Mth column of modeling material is discharged in the main scanning direction. At this time, discharge is performed in the same column on the outward and return passes. Next, in the N+1th layer, the M+1 column is moved using an operation with high positioning accuracy so as to fill the interlace between the M column of the modeling material that is discharged in the Nth layer and the adjacent M column. Discharge the eye modeling material. At this time as well, discharge is performed in the same column on the outward and return passes. FIG. 9B is a schematic diagram showing a side view of a modeled object formed by the method of FIG. 9A.

Here, FIG. 13 is a flowchart showing an example of the processing flow of a discharge program for manufacturing a three-dimensional object in the control means of the three-dimensional object manufacturing apparatus according to the second embodiment. Hereinafter, with reference to FIG. 7, FIG. 9, and FIG. 11, the process flow of the method for manufacturing a three-dimensional structure according to the second embodiment will be described.

In step S21, the control means of the three-dimensional object manufacturing apparatus 200 discharges a model material from the first head 121 by model scan 1 in the forward pass in the N layer, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure the model material. Form layer 1. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 2, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 2, the process moves to S22.

In step S22, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process proceeds to S23.

In step S23, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 3 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 3. do. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 4, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . Once the model layer 4 is formed, the process moves to S24.

In step S24, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process proceeds to S25.

In step S25, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 using the model scan 5 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 5. do. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 6, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 6, the process moves to S26.

In step S26, the control means of the three-dimensional object manufacturing apparatus 200 raises the modeling unit 120 by a predetermined amount in the Z direction, moves it to the N+1 layer, and moves it to a predetermined position in the sub-scanning direction at the same vertical height on the N+1 layer. When the modeling unit 120 is moved to this point, the process moves to S27.
Here, as shown in FIG. 7, the modeling unit 120 is moved in the sub-scanning direction so that the center of the first ejection hole is placed at a position equal to 1/2 x X in the ejection position at the start of printing. . However, the above-mentioned X means the shortest distance between the center of the first ejection hole and the center of the second ejection hole adjacent to the first ejection hole.

In step S27, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 using the model scan 7 on the N+1 layer in the forward pass, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure the model material. Form layer 7. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 8, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 8, the process moves to S28.

In step S28, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S29.

In step S29, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 9 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 9. do. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 10, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 10, the process moves to S30.

In step S30, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S31.

In step S31, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 11 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 11. do. Subsequently, on the return trip, the model material is discharged from the first head 121 by the model scan 12, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 12, the process moves to S32.

In step S32, when the control means of the three-dimensional object manufacturing apparatus 200 returns the position of the modeling unit 120 in the sub-scanning direction to the ejection position at the start of modeling, the process proceeds to S33.

In step S33, when the control means of the three-dimensional object manufacturing apparatus 200 raises the modeling unit 120 by a predetermined amount in the Z direction, this process ends. After this, the three-dimensional structure of Example 2 is obtained by repeating the series of processes from step S21 to step S33 a predetermined number of times.

In Example 2, by performing highly accurate positioning control without performing minute line feed operations as in the conventional technology, it is possible to prevent the occurrence of "Y step" and improve the surface quality of the modeled object. . In addition, by performing the above modeling process multiple times on the Nth layer and then performing highly accurate positioning control on the N+1th layer, there is no need to scan the same layer multiple times, reducing the number of scans per layer. Therefore, the molding time can be reduced and productivity can be improved.

(Comparative example 1)
In Comparative Example 1, the modeling method shown in FIG. 14A was used as the modeling method (conventional method) for performing a minute line break. FIG. 14A is a schematic diagram showing a side view of a modeled object formed by the method of FIG. 14A. In Comparative Example 1, after discharging the Mth column of modeling material in the main scanning direction in the forward pass in the Nth layer, a slight line feed is performed, and in the Nth layer, the building material in the M+1 column in the main scanning direction in the return pass. Discharge.

Here, FIG. 15 is a flowchart showing an example of the processing flow of the discharge program for manufacturing a three-dimensional object in the control means of the three-dimensional object manufacturing apparatus of Comparative Example 1. Hereinafter, with reference to FIGS. 14A and 14B, the process flow of the method for manufacturing a three-dimensional structure of Comparative Example 1 will be described.

In step S41, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 using the model scan 1 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 1. Then, the process moves to S42.

In step S42, the control means of the three-dimensional object manufacturing apparatus 200 shifts the ejection hole (nozzle) position of the modeling unit 120 by one dot in the sub-scanning direction (minor line feed), and then shifts the process to S43.

In step S43, on the return trip, the model material is discharged from the second head 122 by the model scan 2, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is hardened by irradiating ultraviolet rays from the UV irradiation unit 124A . After forming the model layer 2, the process moves to S44.

In step S44, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S45.

In step S45, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 3 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 3. Then, the process moves to S46.

In step S46, the control means of the three-dimensional object manufacturing apparatus 200 shifts the position of the ejection hole (nozzle) of the modeling unit 120 by one dot in the sub-scanning direction (minor line feed), and then shifts the process to S47.

In step S47, on the return trip, the model material is discharged from the first head 121 by the model scan 4, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is irradiated with ultraviolet rays from the UV irradiation unit 124A to be cured. After forming the model layer 4, the process moves to S48.

In step S48, when the control means of the three-dimensional object manufacturing apparatus 200 moves the modeling unit 120 in the sub-scanning direction at the same vertical height, the process moves to S49.

In step S49, the control means of the three-dimensional object manufacturing apparatus 200 discharges the model material from the first head 121 by the model scan 5 on the outward path, and irradiates the model material with ultraviolet rays from the UV irradiation unit 124B to cure it, thereby forming the model layer 5. Then, the process moves to S50.

In step S50, the control means of the three-dimensional object manufacturing apparatus 200 shifts the position of the ejection hole (nozzle) of the modeling unit 120 by one dot in the sub-scanning direction (minor line feed), and then shifts the process to S51.

In step S51, on the return trip, the model material is discharged from the first head 121 by the model scan 6, the surface of the model material is flattened by the flattening roller 123 as a flattening means, and the model material is irradiated with ultraviolet rays from the UV irradiation unit 124A to be cured. After forming the model layer 6, the process moves to S52.

In step S52, when the control means of the three-dimensional object manufacturing apparatus 200 returns the position of the modeling unit 120 in the sub-scanning direction to the ejection position at the start of modeling, the process proceeds to S53.

In step S53, when the control means of the three-dimensional object manufacturing apparatus 200 raises the modeling unit 120 by a predetermined amount in the Z direction, this process ends. After this, the three-dimensional structure of Comparative Example 1 is obtained by repeating the series of processes from step S41 to step S53 a predetermined number of times.

In Comparative Example 1, since "minor line feed" with poor positioning accuracy was performed, a Y level difference occurred in the modeled object, and the surface quality of the modeled object deteriorated.

Next, the Y level difference occurrence rates of Example 2 and Comparative Example 1 were compared in the following manner. The results are shown in Table 1. In addition, since there are differences between three-dimensional object manufacturing devices regarding the positional accuracy of minute line breaks, evaluation was performed using two three-dimensional object manufacturing devices (#20, #8, 3D printer, in-house prototype machine). went.

<Y level difference occurrence rate>
To evaluate the Y level difference occurrence rate, a plurality of surfaces parallel to the XZ plane on the stage of a three-dimensional object manufacturing apparatus were modeled at different XY positions, and the number of surfaces where a Y level difference occurred was counted. The size of the model is 5 mm in length in the X direction, 2 mm in the Y direction, and 10 mm in height in the Z direction. In addition, since the XY positions where Y-level differences are likely to occur vary depending on the three-dimensional object manufacturing equipment, a total of 1080 of these models were placed in positions that covered the front, back, left, right, and center of the stage and evaluated. went. The occurrence rate of Y level difference shown in Table 1 was determined by (number of XZ planes where Y level difference occurs/total number of XZ planes).

表１の結果から、微小改行を行っている比較例１ではＹ段差発生率が２％であるのに対し、実施例２ではＹ段差発生率を０％に抑制できることがわかった。

From the results in Table 1, it was found that in Comparative Example 1, in which a small line feed was performed, the Y level difference occurrence rate was 2%, whereas in Example 2, the Y level difference occurrence rate could be suppressed to 0%.

Examples of aspects of the present invention are as follows.
<1> A discharge means having a plurality of first, second, ... n-th discharge holes in the sub-scanning direction and discharges the modeling material from the plurality of discharge holes;
a curing means for curing the modeling material discharged by the discharge means;
A control means that includes performing normal printing processing that performs normal printing in a plurality of lines, and interlaced printing processing that performs interlaced printing with respect to the normal printing in a plurality of lines;
This is a three-dimensional object manufacturing apparatus characterized by having the following.
<2> The three-dimensional object manufacturing apparatus according to <1>, wherein one interlace printing is performed for one normal printing.
<3> The three-dimensional object manufacturing apparatus according to <1>, wherein a plurality of interlaced printings are performed for one normal printing.
<4> In the Nth layer, perform the normal printing process,
The three-dimensional structure manufacturing device according to any one of <1> to <3>, wherein the interlaced printing process is performed in another layer.
However, the N represents an integer of 1 or more.
<5> The three-dimensional model according to any one of <1> to <4>, wherein the ejecting means reciprocates in the main scanning direction and ejects the modeling material during each forward movement and backward movement. This is manufacturing equipment.
<6> The three-dimensional structure manufacturing apparatus according to <5>, wherein the discharge means discharges more of the modeling material during backward movement than during forward movement.
<7> The three-dimensional structure manufacturing apparatus according to any one of <1> to <6>, further comprising a flattening means for flattening the surface of the modeling material discharged by the discharge means.
<8> The discharge means is capable of discharging a plurality of modeling materials,
The control means discharges and hardens the first modeling material to form the first modeling area, and then discharges the second modeling material in the same row and hardens it to form the second modeling area. The three-dimensional structure manufacturing apparatus according to any one of <1> to <7>, which performs control.
<9> The three-dimensional structure manufacturing apparatus according to <8>, wherein the second modeling material is a water-soluble modeling material.
<10> Discharge for manufacturing a three-dimensional object, characterized by causing a computer to perform normal printing processing in which normal printing is performed in a plurality of lines, and interlaced printing processing in which interlaced printing is performed with respect to the normal printing in a plurality of lines. It is a program.
<11> The ejection program for manufacturing a three-dimensional object according to <10>, which causes a computer to perform the normal printing process on the Nth layer and perform the interlaced printing process on another layer.
However, the N represents an integer of 1 or more.
<12> A three-dimensional object manufacturing apparatus characterized by being equipped with the three-dimensional object manufacturing discharge program according to any one of <10> to <11>.
<13> A normal printing process in which normal printing is performed in multiple lines;
The method for manufacturing a three-dimensional object is characterized in that it includes an interlace printing step of performing interlace printing for the normal printing in a plurality of lines.
<14> The method for manufacturing a three-dimensional object according to <13>, wherein one interlace printing is performed for one normal printing.
<15> The method for manufacturing a three-dimensional object according to <13>, wherein a plurality of interlaced printings are performed for one normal printing.
<16> Performing the normal printing process in the Nth layer,
The method for producing a three-dimensional structure according to any one of <13> to <15>, wherein the interlaced printing process is performed in another layer.
However, the N represents an integer of 1 or more.

The three-dimensional object manufacturing apparatus according to any one of <1> to <9> and <12>, the discharge program for manufacturing three-dimensional object according to any one of <10> to <11>, and the above <13> According to the method for manufacturing a three-dimensional shaped object according to any one of > to <16>, various conventional problems can be solved and the object of the present invention can be achieved.

10 Three-dimensional object manufacturing device 11 First head 12 Second head 13 UV irradiation unit 14 Stage 16 Flattening roller 20 Modeling unit

Japanese Patent Application Publication No. 2017-105141

Claims (13)

A discharge means having a plurality of first, second, ... n-th discharge holes in the sub-scanning direction and discharges the modeling material from the plurality of discharge holes;
a curing means for curing the modeling material discharged by the discharge means;
The ejection means is used in the sub-scanning direction several times in succession to perform normal printing in a plurality of lines, and the ejection means is used for the next printing by a distance smaller than the distance between the ejection holes from the ejection position during the previous printing. Without including a minute line feed for scanning the ejection means in the sub-scanning direction, the ejection hole of the ejection means is located between the ejection hole at the initial position of the ejection means during the previous normal printing and the adjacent ejection hole. After the ejection means is moved to a position where the ejection hole is arranged, the ejection means is moved in the sub-scanning direction several times in succession to form a plurality of lines to perform interlaced printing with respect to the normal printing. a control means comprising;
A three-dimensional object manufacturing device characterized by having the following. The three-dimensional object manufacturing apparatus according to claim 1, wherein one of the interlace printing is performed for one of the normal printing. The three-dimensional object manufacturing apparatus according to claim 1, wherein a plurality of said interlace printings are performed for one said normal printing. Performing the normal printing in the Nth layer,
4. The three-dimensional object manufacturing apparatus according to claim 1, wherein the interlace printing is performed in another layer.
However, the N represents an integer of 1 or more. 5. The three-dimensional object manufacturing apparatus according to claim 1, wherein the ejecting means reciprocates in the main scanning direction and ejects the modeling material during each forward movement and backward movement. The three-dimensional object manufacturing apparatus according to claim 5, wherein the discharge means discharges more of the modeling material during backward movement than during forward movement. The three-dimensional structure manufacturing apparatus according to any one of claims 1 to 6, further comprising a flattening means for flattening the surface of the modeling material discharged by the discharge means. The discharge means is capable of discharging a plurality of modeling materials,
The control means discharges and hardens the first modeling material to form the first modeling area, and then discharges the second modeling material in the same row and hardens it to form the second modeling area. The three-dimensional object manufacturing apparatus according to any one of claims 1 to 7, which performs control. The three-dimensional structure manufacturing apparatus according to claim 8, wherein the second modeling material is a water-soluble modeling material. A discharge means having a plurality of first, second, ... n-th discharge holes in the sub-scanning direction and discharging the modeling material from the plurality of discharge holes is continuously inserted into the sub-scanning direction a plurality of times. Normal printing is performed in multiple lines at once, and the ejection means is scanned in the sub-scanning direction during the next printing by a distance smaller than the distance between the ejection holes from the ejection position during the previous printing, without including a minute line feed. , after moving the ejection means to a position where the ejection hole of the ejection means is arranged between the ejection hole at the initial position of the ejection means during the normal printing and the adjacent ejection hole; , a discharge program for producing a three-dimensional object, characterized in that the computer causes a computer to carry out a process of performing interlaced printing with respect to the normal printing by continuously feeding the discharging means a plurality of times in the sub-scanning direction and collectively forming a plurality of lines. . 11. The ejection program for manufacturing a three-dimensional object according to claim 10, wherein the computer performs the normal printing in the Nth layer and the interlaced printing in another layer.
However, the N represents an integer of 1 or more. A three-dimensional object manufacturing apparatus, comprising the three-dimensional object manufacturing discharge program according to any one of claims 10 to 11. A discharge means having a plurality of first, second, ... n-th discharge holes in the sub-scanning direction and discharging the modeling material from the plurality of discharge holes is continuously inserted into the sub-scanning direction a plurality of times. Normal printing is performed in multiple lines at once, and the ejection means is scanned in the sub-scanning direction during the next printing by a distance smaller than the distance between the ejection holes from the ejection position during the previous printing, without including a minute line feed. , after moving the ejection means to a position where the ejection hole of the ejection means is arranged between the ejection hole at the initial position of the ejection means during the normal printing and the adjacent ejection hole; A method for manufacturing a three-dimensional object, comprising the step of performing interlaced printing with respect to the normal printing by using the discharging means in the sub-scanning direction a plurality of times in succession to form a plurality of lines.

Images