JP6660817B2 - Three-dimensional object molding method - Google Patents

Description

  The present invention relates to a three-dimensional object forming method for forming a three-dimensional object by an additive manufacturing method.

  2. Description of the Related Art In recent years, 3D printers that form a three-dimensional three-dimensional object have been used for various purposes. The 3D printer manufactures a three-dimensional object to be manufactured by sequentially forming and stacking a number of layers. The formation of each layer is performed based on three-dimensional shape data representing the three-dimensional shape of a three-dimensional object to be manufactured and coloring data of the surface.

JP-A-2015-344411

  Although the surface of the three-dimensional object has color, text, and detailed shape and is important in quality, the interior has a function of filling the volume, but there is a problem that a large amount of expensive modeling material is consumed . Further, when the service life of the three-dimensional object is over, there is an environmental problem as waste.

  When the strength of the material of the three-dimensional object is low, the three-dimensional object may be damaged. For example, when a three-dimensional object has an elongated portion, the portion has low strength (bending strength) and is easily broken. In the invention described in Patent Document 1, such a problem of insufficient strength is solved by providing a reinforcing material in a reinforcing hole extending inward from an opening on the outer surface of the three-dimensional object. When the three-dimensional object is small, no significant problem occurs even if the strength is low. However, since the weight increases as the three-dimensional object increases, the problem of the strength is serious for a large three-dimensional object.

  In view of the above background, an object of the present invention is to provide a molding method capable of reducing the consumption of a molding material by forming a void inside a three-dimensional object and fitting a solid substance into the void.

  The three-dimensional object forming method of the present invention is a three-dimensional object forming method of forming a three-dimensional object by a lamination molding method, using a curable resin, and laminating the curable resin, while forming a void inside, One or more times of a first step of shaping the external shape of the three-dimensional object, and a second step of fitting a solid into the space and further laminating the curable resin on the solid. Do.

  By forming a space inside the three-dimensional object and fitting the fixed object in this way, the consumption of the modeling material can be reduced. In addition, since the upper part of the void formed inside the three-dimensional object needs to be closed with a curable resin, at least a part of the inner wall of the void has an overhang shape, but the solid material is used as a base and the resin is formed. By stacking, overhang can be avoided.

  In the three-dimensional object forming method of the present invention, in the second step, a solid having a specific gravity smaller than that of the curable resin may be fitted.

  By fitting the fixed object having a smaller specific gravity than the curable resin into the space formed inside the three-dimensional object in this way, the weight of the three-dimensional object can be reduced.

  In the three-dimensional object forming method of the present invention, in the second step, a solid object lower than the depth of the void may be fitted.

  With this configuration, the solid does not protrude from the void, and it is possible to avoid collision with the flattening roller that flattens the lamination surface of the curable resin.

  The three-dimensional object modeling method according to the present invention is characterized in that, in the second step, a plurality of layers of the curable resin are laminated on the upper surface of the layer forming the void and on the solid material until the laminated surface becomes flat. You may.

  With this configuration, a step between the upper surface of the layer forming the void and the solid can be eliminated.

  In the three-dimensional object forming method of the present invention, in the first step, a void whose diameter increases as going upward may be formed. With this configuration, it is easy to form the inner wall of the cavity, and it is easy to fit solid matter into the cavity.

  In the three-dimensional object forming method of the present invention, the solid may be a foamable resin, sponge, wood, cork, rubber, or a combination thereof. With this configuration, a three-dimensional object can be formed lightly and inexpensively.

  In the three-dimensional object forming method of the present invention, in the second step, the substrate on which the electronic circuit is formed is placed with the surface on which the electronic circuit is formed facing the space, and the substrate is further placed on the substrate. The curable resin may be laminated. With this configuration, it is possible to perform control such as illuminating and moving the three-dimensional object, and outputting sound from the three-dimensional object.

  In the three-dimensional object forming method of the present invention, when performing the second step in a region below the three-dimensional object, a solid having a specific gravity greater than that of the curable resin may be fitted. With this configuration, the three-dimensional object can be stably placed with the center of gravity downward.

  The present invention can reduce the amount of the curable resin by putting a solid substance inside the three-dimensional object.

(A) is a figure which shows an example of a three-dimensional object. FIG. 2B is a sectional view of the three-dimensional object shown in FIG. It is a figure which shows the structure of a three-dimensional molded item manufacturing apparatus. (A)-(d) is a figure which shows the manufacturing process of the three-dimensional object by the three-dimensional object molding method of this Embodiment. (A)-(c) is a figure which shows the relationship between a void and a solid. It is a figure which shows the structure of the three-dimensional-object shaping apparatus which inserts a solid substance in a space. (A) is sectional drawing of the three-dimensional object which put the board | substrate which has an electronic circuit. FIG. 2B is a diagram illustrating a configuration of a substrate having an electronic circuit. (A) is sectional drawing which shows the example which fitted the annular solid material. (B) is a top view which shows the example which inserted the annular solid material. (C) is a figure which shows the effect of having used the cyclic | annular solid material.

Hereinafter, a three-dimensional object forming method according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1A is a diagram illustrating an example of a three-dimensional object 30 formed by the three-dimensional object forming method according to the present embodiment, and FIG. 1B is a cross-sectional view of the three-dimensional object illustrated in FIG. . The three-dimensional object 30 shown in FIG. 1A is a bird that rests on a pedestal, but the legs of the bird are thin. For this reason, when the weight of the bird is heavy, there is a possibility that the leg portion is broken.

  A bird, which is an example of a three-dimensional object formed by the three-dimensional object forming method according to the present embodiment, has a solid substance 32 therein as shown in FIG. The solid substance 32 has a lower specific gravity than the curable resin, and is intended to reduce the weight of a three-dimensional bird. For example, while the specific gravity of the curable resin is about 1, while the solid material 32 is a polyethylene foam having a specific gravity of about 0.1, the internal weight can be reduced to about 1/10. it can.

  Although the solid 32a is also contained in the pedestal, the solid 32a has a higher specific gravity than the curable resin. Thereby, the center of gravity of the three-dimensional object can be lowered, and the three-dimensional object can be stably placed. The solid substance 32a is preferably made of a stainless steel block having a specific gravity of about 7.8 without rust.

  FIG. 2 is a diagram illustrating a configuration of the three-dimensional object forming apparatus 10. The three-dimensional object forming apparatus 10 is an ink-jet type 3D printer in which ultraviolet curable resin ejected from an ink-jet head is solidified by ultraviolet light and laminated. The three-dimensional object forming apparatus 10 includes a discharge unit 12, a main scanning drive unit 14, a forming table 16, and a control unit 18. The ejection unit 12 is a part that ejects droplets (ink droplets) that are the material of the three-dimensional object 30. The three-dimensional object forming apparatus 10 is not limited to the one using an ultraviolet curable resin, but may be a method of laminating a thermoplastic curable resin that is jetted from an inkjet head at a high temperature, cooled to room temperature, and cured. .

  The ejection unit 12 includes an ink head 20 for ejecting colored and colorless inks and inks containing support materials, an ultraviolet light source 22 for curing the ejected ink, and a curable ink formed during the formation of the three-dimensional object 30. It has a flattening roller 24 for flattening the resin lamination surface. Here, three ink heads 20 are shown, but the number of ink heads 20 can be set to an appropriate number according to the number of types of ink used.

  The ejection unit 12 forms each layer constituting the three-dimensional object 30 by ejecting, for example, ink droplets of a curable resin that is cured by irradiation of ultraviolet rays and curing the same. Specifically, for example, the ejection unit 12 ejects ink droplets in accordance with an instruction from the control unit 18 to form a layer of a curable resin and a curable resin layer formed by the layer forming operation. The curing operation for curing the resin layer is repeated a plurality of times. As a result, the discharge unit 12 forms a plurality of layers of the cured curable resin in a stacked manner.

  The main scanning drive unit 14 is a driving unit that causes the ejection unit 12 to perform a main scanning operation. Here, the main scanning operation is, for example, an operation of ejecting ink droplets while moving in a predetermined main scanning direction (Y direction in the drawing).

  The main scanning drive section 14 has a carriage 102 and a guide rail 104. The carriage 102 is a holding unit that holds the ejection unit 12 so as to face the modeling table 16. That is, the carriage 102 holds the ejection unit 12 such that the ejection direction of the ink droplets is directed to the modeling table 16. In addition, during the main scanning operation, the carriage 102 moves along the guide rail 104 while holding the ejection unit 12. The guide rail 104 is a rail-shaped member that guides the movement of the carriage 102, and moves the carriage 102 according to an instruction from the control unit 18 during the main scanning operation.

  The movement of the ejection unit 12 in the main scanning operation may be a relative movement with respect to the three-dimensional object 30. For example, the side of the three-dimensional object 30 may be moved by fixing the position of the ejection unit 12 and moving, for example, the modeling table 16.

  The modeling table 16 is an example of a mounting table, and mounts the three-dimensional object 30 during modeling. The modeling table 16 has a function of moving the upper surface in the vertical direction (the Z direction in the figure), and moves the upper surface in accordance with the progress of the modeling of the three-dimensional object 30 in accordance with an instruction from the control unit 18. . In addition, the distance (gap) between the molding surface of the three-dimensional object 30 during molding and the discharge unit 12 is appropriately adjusted. Here, the modeling surface of the three-dimensional object 30 is, for example, a surface on which the next layer is formed by the discharge unit 12. The scanning in the Z direction for moving the modeling table 16 up and down with respect to the ejection unit 12 may be performed by moving the ejection unit 12 side, for example.

  The control unit 18 is, for example, a CPU of the three-dimensional object forming apparatus 10, and controls each unit of the three-dimensional object forming apparatus 10 based on shape information of the three-dimensional object 30 to be formed, color image information, and the like. Control the modeling operation.

  Note that the three-dimensional object forming apparatus 10 may further include, for example, various structures necessary for forming, coloring, and the like of the three-dimensional object 30 in addition to the structure illustrated in FIG. For example, the three-dimensional object forming apparatus 10 may further include a sub-scan drive unit that causes the ejection unit 12 to perform a sub-scan operation. The sub-scanning operation is, for example, an operation of moving the inkjet head of the ejection unit 12 in a sub-scanning direction orthogonal to the main scanning direction relative to the three-dimensional object 30 being formed. The sub-scanning drive unit controls the ejection unit 12 to perform a sub-scanning operation as necessary, for example, when forming a three-dimensional object 30 whose length in the sub-scanning direction is longer than the modeling width of the inkjet head in the ejection unit 12. Let it do. Further, the sub-scanning driving unit may be, for example, a driving unit that moves a guide rail together with a carriage that holds the ejection unit 12.

  Next, a three-dimensional object forming method for forming a three-dimensional object using the three-dimensional object forming apparatus 10 shown in FIG. 2 will be described. FIG. 3A to FIG. 3D are diagrams illustrating a process of manufacturing a three-dimensional object by the three-dimensional object forming method according to the present embodiment. Note that, for convenience of description, the three-dimensional object manufactured in the manufacturing process illustrated in FIGS. 3A to 3D is different from the bird illustrated in FIG.

  The three-dimensional object forming apparatus 10 stacks the resin based on the three-dimensional shape information, and stacks the support 36 and the three-dimensional object 30 on the modeling table 16. By the way, when the three-dimensional object 30 increases in size as it goes upward, a so-called “overhang” state in which the curable resin cannot be laminated because the surface to be newly laminated on the already laminated surface is larger is present. Occurs. The support 36 is a laminated structure (support layer) that supports the three-dimensional object 30 by surrounding the outer periphery of the three-dimensional object 30 being formed, whereby the curable resin can be laminated on the overhang portion. After the formation of the three-dimensional object 30 is completed, the support 36 is dissolved and removed with, for example, water.

  In the present embodiment, the three-dimensional shape information is information having a space inside a three-dimensional object. As shown in FIG. 3A, the external shape of the three-dimensional object is formed, and a void 34 is formed inside. This corresponds to a “first step”. The cavity 34 has a shape whose diameter increases as it goes upward. The data of the void 34 may be created at the same time as designing a three-dimensional shape by CAD or the like, or may be created at the time of adjusting the orientation, size, arrangement, etc. at the time of modeling before modeling. Good. In the case of modeling data created by a three-dimensional scanner, the latter procedure is used.

  When the shape shown in FIG. 3A is formed, the lamination is stopped once, and the solids 32 are fitted into the voids 34 as shown in FIG. 3B. In the present embodiment, a foamable resin is used as the solid substance 32. As the resin material, a material that does not cause a chemical reaction even when it comes into contact with a molding material, such as polyethylene, polypropylene, or polyethylene terephthalate, is used. If the foaming resin is large, the molding material may enter the pores of the foam and the thickness of the laminate may not be maintained. Therefore, a “single foam” in which individual bubbles are independent is preferable. The solid material 32 is not limited to the foamable resin, and may be any material that does not react with the curable resin. For example, sponge, wood, cork, rubber, or the like can be used. The solid substance 32 preferably has a specific gravity smaller than that of the curable resin.

  The shape of the solid 32 is preferably a shape that fits into the void 34. It may have a trapezoidal cross section like the solid material 32 shown in FIG. 3 (b), or it may be slightly wider than the void 34 and rectangular in cross section, and fitted with the softness of the material. It may be suitable. If the fitting is not good and a gap is formed between the void 34 and the solid substance 32, the curable resin to be laminated flows into and causes a molding failure.

  The operation of fitting the solid matter 32 into the space 34 is manually performed by the user. After the solids 32 are inserted into the voids 34, the stacking by the three-dimensional object forming apparatus 10 is restarted, and the curable resin is stacked on the solids 32, as shown in FIG. This corresponds to a “second step”.

  Here, the relationship between the depth of the void 34 and the height of the solid object 32 will be described. FIG. 4A is a diagram showing a state in which the solids 32 are fitted in the voids 34 (see FIG. 3B). As shown in FIG. 4A, the height of the solid material 32 is lower than the depth of the void 34, and the height of the upper surface P1 of the layer defining the void 34 and the upper surface P2 of the solid material 32 is different. There is a clearance C of about 200 μm between them. Note that 200 μm is an example, and the size of the clearance C can be appropriately designed.

  When laminating the curable resin on the surface P1 that is the molding surface and the upper surface P2 of the solid material 32, the curable resin is discharged onto the molding surface, and after being flattened by the flattening roller 24, A process of curing with ultraviolet light is performed. In FIG. 4A, a dashed line L indicates a locus of the lower end of the flattening roller 24. In the present embodiment, since the solid 32 is lower than the surface P1 by the clearance C, it is possible to prevent the flattening roller 24 from colliding with the solid 32 beforehand.

  In the present embodiment, after the solid material 32 is fitted into the space 34, the curable resin for forming the three-dimensional object 30 is also discharged onto the entire upper surface of the solid material 32. At this time, the amount of the curable resin to be discharged is slightly larger than the amount required for forming one layer (for example, increased by 20%). By flattening the excessively discharged curable resin by the flattening roller 24, as shown in FIG. 4B, the step between the place where the solid substance 32 was and the other place is gradually reduced, When about 20 layers are stacked, as shown in FIG. 4 (c), the fabrication surface P1 becomes a plane. Thereby, the next time the solid substance 32 is fitted, it can be properly fitted.

  Returning to FIG. Continuing after the state of FIG. 3C, the three-dimensional object forming apparatus 10 performs lamination according to the three-dimensional shape information, and forms the external shape of the three-dimensional object 30 as shown in FIG. At the same time, there is a void 34 inside. Therefore, the three-dimensional object forming apparatus 10 temporarily stops stacking and inserts the solid object 32. In this way, by repeatedly performing the operation of forming the voids 34, inserting the solids 32, and further laminating, the three-dimensional object 30 having the solids 32 therein can be formed.

  Note that, in the above description, an example is shown in which a void 34 is further formed above the void 34 in which the solid substance 32 has been fitted (see FIG. 3D). However, it is not always necessary to form a new void 34. However, a three-dimensional object may be formed by laminating the curable resin without forming a void from the state shown in FIG. The size and the number of voids to be formed inside the three-dimensional object can be appropriately designed depending on the shape of the three-dimensional object, the degree to reduce the consumption of the modeling material, the degree to reduce the weight, and the like.

  The three-dimensional object forming method according to the present embodiment has been described above. According to the three-dimensional object forming method of the present embodiment, the three-dimensional object 30 in which the solid substance 32 having a lower specific gravity than the curable resin is placed is generated, so that the three-dimensional object 30 can be reduced in weight. Thereby, even if the three-dimensional object 30 has a thin portion, the risk of the portion being broken can be reduced.

  Further, since the solid object 32 is put inside the solid object forming method of the present embodiment, the strength of the solid object 30 can be maintained even in the space 34, and the upper surface of the solid object 32 can be laminated. Making it possible. Further, by selecting an inexpensive material as the solid material 32, the three-dimensional object 30 can be formed at low cost. In addition, if the columnar structure of the three-dimensional object 30 is formed between the plurality of solid objects 32 as shown in FIG. 3, the strength against the vertical force can be secured.

  Although the three-dimensional object forming method of the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the above-described embodiments. In the above-described embodiment, an example has been described in which the user manually performs the operation of fitting the solid matter 32 into the void 34. However, the fitting of the solid matter 32 may be performed automatically. FIG. 5 is a diagram illustrating a configuration of the three-dimensional object forming apparatus 10 that can also insert the solid object 32 into the empty space 34. In the three-dimensional object modeling device 10 illustrated in FIG. 5, the modeling unit has the same configuration as the device illustrated in FIG. The device shown in FIG. 5 has a solid material cutting portion and a solid material attaching portion in addition to this configuration.

  The solid cut section has a cutter 52 and has a function of cutting the solid 32 according to the shape of the void 34, for example. A rail 54 is suspended between the solid cut section and the solid mounting section, and the suction unit 50 moves on and off the rail 54. The adsorption unit 50 adsorbs the solid substance 32 cut by the solid substance cutting section and carries the solid substance 32 to the solid substance mounting section. On the other hand, in the modeling section, the modeling table 16 on which the three-dimensional object 30 having the void 34 formed therein is slid to the solid object mounting section. Then, in the solid mounting portion, the suction unit 50 fits the solid 32 into the void 34 formed in the three-dimensional object 30. Then, after the solids 32 are inserted into the voids 34, the modeling table 16 on which the three-dimensional object 30 is placed is returned to the modeling part, and the stacking of the three-dimensional object 30 is resumed. By using such a three-dimensional object forming apparatus 10, the solid object 32 can be automatically inserted.

  Further, as the solid substance 32, a substrate having an electronic circuit may be put. FIG. 6A is a cross-sectional view of a three-dimensional object including a substrate 38 having an electronic component 40, and FIG. 6B is a diagram illustrating a configuration of the substrate 38 having the electronic component 40. Since the upper surface of the substrate 38 is a laminated surface, a single-sided mounting substrate is used. As the electronic component 40, general electronic components such as a microprocessor, a microphone, a speaker, an LED, various sensors, a motor, and a battery are mounted.

  The substrate 38 is fitted into the cavity 34 with the surface having the electronic component 40 facing the cavity 34, that is, with the surface having the electronic component 40 facing downward. By placing the substrate 38 having the electronic component 40 in the solid object 32 in this manner, it is possible to control the three-dimensional object 30 to shine and move, and to output sound from the three-dimensional object 30. Becomes In the case where the single-sided mounting board 38 is provided as described above, the solid material 32 that easily deforms according to the unevenness of the electronic component 40 is used, but it is not always necessary to fit the solid material 32 into the void 34. Absent. When a soft material such as a sponge is fitted as the solid material 32, a sponge slightly larger than the cavity 34 can be used so as to eliminate the clearance between the sponge and the inner wall of the cavity 34. In this case, there is a possibility that the sponge may protrude from the void 34. it can.

  Further, in the above-described embodiment, an example is described in which the solid material 32 having substantially the same shape as the space 34 is fitted, but the solid material 32 does not necessarily have to have the same shape as the space 34. FIG. 7A is a cross-sectional view showing an example in which the annular solid substance 32 is fitted in the space 34, and FIG. 7B is a top view thereof. FIG. 7A is an AA cross section of FIG. 7B.

  As shown in FIGS. 7A and 7B, by connecting the annular solid 32 and the inner wall of the cavity 34, a curable resin can be laminated on the solid 32. As a result, if there is no solid matter 32, as shown by a solid line in FIG. 7C, when the inner wall 30a of the void 34 is formed, the inner wall 30a has an overhang shape, and the inner wall 30a of the void 34 is formed. However, since the resin 30b can be laminated also on the upper surface of the solid material 32 as indicated by the dotted line by the annular solid material 32, the overhang state can be avoided and the void 34 can be appropriately generated.

  Further, in the above-described embodiment, after the solid material 32 is fitted, as shown in FIG. 3C, the solid material 32 is flattened without a step between the solid material 32 and the molding surface. Although the example in which the curable resin is entirely laminated has been described, the lamination may be performed without forming this step and forming the external shape while forming the void 34 shown in FIG.

  Furthermore, in the above-described embodiment, if the shapes of the plurality of cavities 34 are the same, data generation of the arrangement of the cavities 34 becomes easy, and automatic data generation is also easy. Further, since the corresponding plural solids 32 are also the same, the efficiency of the production, the standardization, and the automation of the work of manufacturing the solids 32 and fitting them into the voids 34 are facilitated.

Hereinafter, effects of the three-dimensional object forming method of the present embodiment will be described.
(1) The three-dimensional object forming method of the present embodiment includes a first step of forming an outer shape of the three-dimensional object 30 while laminating a curable resin to form a void 34 therein (see FIG. a)), a solid substance 32 is inserted into the void 34 (see FIG. 3B), and a second step of further laminating the curable resin on the solid substance 32 (FIGS. 3C and 3D). )) Is performed once or more than once. By forming the void 34 inside the three-dimensional object 30 and fitting the fixed object 32 into the void 34 in this way, it is possible to reduce the consumption of the modeling material. In addition, since it is necessary to close the upper part of the void 34 formed inside the three-dimensional object 30 with a curable resin, at least a part of the inner wall of the void 34 has an overhang shape (see, for example, FIG. 7). (C) 30a) By laminating the resin on the basis of the solid substance 32, overhang can be avoided.

(2) In the three-dimensional object forming method of the present embodiment, a solid 32 having a lower specific gravity than the curable resin is inserted. By fitting the fixed object 32 having a lower specific gravity than the curable resin into the space 34 formed inside the three-dimensional object 30 as described above, the weight of the three-dimensional object 30 can be reduced.

(3) In the three-dimensional object forming method of the present embodiment, the solid object 32 that is lower than the depth of the void 34 is inserted (see FIG. 4A). With this configuration, the solid substance 32 does not protrude from the space 34, and collision with the flattening roller 24 that flattens the lamination surface of the curable resin can be avoided.

(4) In the three-dimensional object forming method of the present embodiment, a plurality of layers of curable resin are stacked on the upper surface of the layer forming the void 34 and on the solid object 32 until the stacked surface becomes flat (FIG. 4). (See (a) to (c)). With this configuration, a step between the upper surface of the layer forming the void 34 and the solid substance 32 can be eliminated.

(5) In the three-dimensional object forming method of the present embodiment, the void 34 may be formed such that the diameter increases as going upward (see FIG. 3A). With this configuration, the inner wall of the cavity 34 can be easily formed, and the solid substance 32 can be easily fitted into the cavity 34.

(6) In the three-dimensional object forming method of the present embodiment, a foamable resin is used as the solid material 32. With this configuration, the three-dimensional object 30 can be formed lightly and inexpensively.

(7) In the three-dimensional object forming method according to the modified example of the present embodiment, the substrate 38 on which the electronic circuit is formed is placed with the surface on which the electronic circuit is formed facing the void 34, and Further, a curable resin may be further laminated (see FIG. 6). With this configuration, it is possible to perform control such as illuminating and moving the three-dimensional object 30 and outputting sound from the three-dimensional object 30.

(8) In the three-dimensional object forming method of the present embodiment, a solid 32a having a higher specific gravity than the curable resin is fitted into a pedestal below the three-dimensional object 30 (see FIG. 1). According to this configuration, the three-dimensional object 30 can be stably placed with the center of gravity of the three-dimensional object 30 facing downward.

  The present invention relates to a three-dimensional object forming method for forming a three-dimensional object by an additive manufacturing method.

DESCRIPTION OF SYMBOLS 10 Three-dimensional object forming apparatus 12 Ejection unit 14 Main scanning drive part 16 Modeling table 18 Control part 20 Ink head 22 Ultraviolet light source 24 Flattening roller 30 Three-dimensional object 32 Solid object 34 Void 36 Support 38 Substrate 40 Electronic component 50 Suction unit 52 Cutter 54 rail 102 carriage 104 guide rail

Claims (7)

Using a curable resin, a three-dimensional object modeling method of modeling a three-dimensional object by additive manufacturing,
A first step of forming the outer shape of the three-dimensional object while laminating the curable resin and forming a void inside;
A second step of fitting a solid in the void and further laminating the curable resin on the solid;
The stomach one or more times a row,
In the first step, a three-dimensional object forming method for forming a void whose diameter increases as going upward .   The three-dimensional object forming method according to claim 1, wherein in the second step, a solid having a specific gravity smaller than that of the curable resin is inserted.   3. The three-dimensional object forming method according to claim 1, wherein, in the second step, a solid that is lower than a depth of the space is inserted. 4. Using a curable resin, a three-dimensional object modeling method of modeling a three-dimensional object by additive manufacturing,
A first step of forming the outer shape of the three-dimensional object while laminating the curable resin and forming a void inside;
A second step of fitting a solid in the void and further laminating the curable resin on the solid;
One or more times,
In the second step, a solid substance lower than the depth of the empty space is inserted,
In the second step, the amount of the curable resin is ejected on the upper surface of the layer forming the void and on the solid material, so that the amount of the curable resin is larger than that required for forming one layer. standing body was molding method faces you laminating the curable resin of plural layers until flat. The three-dimensional object forming method according to any one of claims 1 to 4 , wherein the solid is a foamable resin, sponge, wood, cork, or rubber. The said 2nd process WHEREIN: The board | substrate in which the electronic circuit was formed was installed in the surface in which the said electronic circuit was formed facing the said space, The said curable resin is further laminated | stacked on the said board | substrate. The three-dimensional object forming method according to any one of 1 to 5 . Wherein when performing the second step in the region below the three-dimensional object, three-dimensional object manufacturing method according to any one of claims 1 to 6 fitting the specific gravity is greater solids than the curable resin.

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