JP2020124841A - Three-dimensional molding object - Google Patents

Abstract

To provide a three-dimensional molding object in which a shape of a hollow portion is formed with high precision by an optical molding method.SOLUTION: A three-dimensional molding object 20 is formed by stacking a cured layer 21 formed by irradiating a photocurable resin 12 with light, and has a hollow portion 22. At least one of a hole 24 and a recess 27 continuous with the hollow portion 22 is provided on a bottom 22a of the hollow portion 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a three-dimensional structure having a hollow portion formed by laminating a cured layer formed by irradiating a photocurable resin with light.

In recent years, a photocurable resin is irradiated with light to produce three-dimensional molded objects having various shapes.
For example, Patent Document 1 below describes that a ring-shaped three-dimensional molded item is manufactured by an optical molding method. In Patent Document 1, a support is provided inside the ring body to form a ring-shaped three-dimensional object, and thus deformation such as warpage that occurs in the three-dimensional object is prevented.

When a three-dimensional molded object is molded using a photocurable resin, an apparatus as shown in FIG. 14(a) or 14(b) is generally used.
In these devices, the bottom plate 11 is made of a translucent material and is supplied with the photocurable resin 12, the storage part 13, the irradiation part 14 for irradiating light from below the bottom plate 11, and the irradiation part 14 for irradiation. The light-curable resin 12 just above the bottom plate 11 is cured by light to form a cured layer 21 having a predetermined shape, and a raised/lowered holding unit 15 that holds the formed cured layer 21 and can move up and down. And are equipped with.

In order to model the three-dimensional modeled object 20 having a hollow portion using such a device, as shown in FIG. 15A, the support section 16 attached to the elevating/retaining section 15 is set to a predetermined height from the bottom plate 11. In a state in which the hardened layer 21 is accurately arranged, the hardened layer 21 is formed by irradiating light from the irradiation unit 14, and the hardened layer 21 is laminated on the supporting unit 16 of the elevating and holding unit 15.

Next, the raising/lowering holding unit 15 is raised to arrange the lower surface of the hardened layer 21 at a predetermined height from the bottom plate 11 with high accuracy, and the light from the irradiation unit 14 is irradiated to form the next hardened layer 21. To do. As a result, the next hardened layer 21 is laminated on the lower surface of the hardened layer 21 that has been previously hardened to be integrated.
After that, the elevating/holding unit 15 is raised to sequentially form a hardened layer 21 having a thickness of, for example, about 0.5 mm, and the hardened layer 21 is sequentially laminated on the lower surface of the previously laminated hardened layer 21.

At that time, as shown in FIG. 15B, by irradiating light from the irradiation unit 14 to a portion of the target three-dimensional object 20 except a position corresponding to the hollow portion 22, the hollow portion of each cured layer 21. The hardened layer 21 is repeatedly laminated while forming a shape corresponding to 22.
Then, as shown in FIG. 15C, the stacking of all the hardened layers 21 is completed, whereby the three-dimensional model 20 having the hollow portion 22 having a predetermined shape is manufactured.

JP, 2009-190291, A

However, as shown in FIGS. 15A to 15C, when a conventional three-dimensional object 20 is manufactured by sequentially laminating a large number of cured layers in a photocurable resin, a hollow portion 22 having a circular vertical cross section is formed. Even if it is attempted to form the hollow portion 22 with high accuracy, the deformed portion X is generated inside the hollow portion 22 as shown in FIGS. 16A and 16B, and the shape of the hollow portion 22 cannot be formed with high precision.

Therefore, an object of the present invention is to provide a three-dimensional object in which the shape of the hollow portion is formed with high precision by a stereolithography method.

As a result of intensive studies by the present inventors, when a cured layer of a photocurable resin is sequentially laminated by a stereolithography method to form a three-dimensional object, the lower surface of the cured layer is deformed by fluid pressure received from the photocurable resin. I found something new to happen.

For example, when laminating the hardened layer using a general apparatus as shown in FIGS. 14A and 14B, the hardened layer 21 laminated on the supporting portion 16 and the supporting portion 16 is provided at a predetermined height from the bottom plate 11. In order to accurately arrange the hardened layer 21 in the photocurable resin, the hardened layer 21 is lifted up and down in the photocurable resin by, for example, raising and lowering the raising and lowering holding portion 15 once and then accurately moving the hardened layer 21 to a predetermined height. Adjust the position.

At that time, as shown in FIG. 17, when the hardened layer 21 that constitutes the bottom of the hollow portion 22 is laminated on the lower surface of the intermediate body 23 in which the upper portion and side portions of the hollow portion 22 are formed, the bottom of the hollow portion 22 is formed. A hardened layer 21 is arranged which is very thin and easily deformed.

When the intermediate body 23 is raised and lowered by the raising and lowering holding portion 15 in that state, the fluid pressure of the photocurable resin is applied to the hardened layer 21 forming the bottom of the hollow portion 22, and the hollow portion 22 is deformed into a curved shape.
After that, when the hardened layer 21 is further laminated, the three-dimensional object 20 is manufactured with the bottom of the hollow portion 22 deformed inward, and the deformed portion X occurs inside the hollow portion 22.

Therefore, in order to solve the above problems, the present invention is a three-dimensional object having a hollow portion, which is formed by laminating a cured layer formed by irradiating a photocurable resin with light, It is characterized in that at least one of a hole portion and a concave portion continuous with the hollow portion is provided on the bottom of the portion.

In the three-dimensional structure of the present invention, the recess may have a depth equal to or larger than the thickness of the hardened layer.
Further, in the three-dimensional molded article of the present invention, the recess may have a depth capable of accommodating a deformation occurring in the hardened layer forming the bottom of the recess.
Furthermore, in the three-dimensional molded article of the present invention, an upper surface recess may be provided on the upper surface.

According to the three-dimensional object of the present invention, in the three-dimensional object formed by laminating a cured layer formed by irradiating light on a photocurable resin, a hole continuous with the hollow portion at the bottom of the hollow portion. At least one of the part and the recess is provided.

Therefore, when the hardened layer forming the bottom of the hollow portion is sequentially laminated in the photocurable resin on the lower surface of the intermediate body in which the upper portion and the side portion of the hollow portion are formed, the photocurable resin constitutes the bottom of the hollow portion. Through holes are present in the cured layer, and the photocurable resin can pass through these through holes. As a result, even if one or a plurality of hardened layers forming the bottom of the hollow portion are thin and easily deformed, it is possible to prevent the fluid pressure of the photocurable resin from being excessively applied, and the bottom of the hollow portion can be prevented. It is possible to prevent deformation of the respective hardened layers.
Therefore, according to the present invention, it is possible to provide a three-dimensional modeled object in which a hollow portion is formed with high accuracy even when a cured layer is laminated in a photocurable resin.

In the three-dimensional molded article of the present invention, for example, when the recess has a depth equal to or greater than the thickness of the cured layer, the cured layer forming the bottom of the hollow portion when the cured layers are sequentially laminated in the photocurable resin. A through hole corresponding to the recess is surely formed in the. Therefore, the photocurable resin can pass through the through holes when the cured layer is laminated thereafter, and the deformation of the cured layer forming the bottom of the hollow portion due to the fluid pressure can be reliably prevented.

In the three-dimensional molded article of the present invention, for example, when the recess has a depth capable of accommodating the deformation generated in the hardened layer forming the bottom of the recess, when the hardened layers are laminated to form the recess, Even if the hardened layer that forms the bottom of the recess is laminated on the lower surface of the intermediate body on which the side surface is formed to close the bottom of the recess and the hardened layer is deformed by the fluid pressure of the photocurable resin, it is deformed in the recess. However, it does not affect the shape of the hollow portion. Therefore, it is possible to accurately form the inside of the hollow portion with a desired shape.

In the three-dimensional molded object of the present invention, for example, an upper surface recess may be provided on the upper surface. As a result, when the cured layer forming the upper surface is sequentially laminated in the photocurable resin, the photocurable resin has through holes in the cured layer forming the upper surface. Can pass through.
As a result, the fluid pressure of the photocurable resin is prevented from being excessively applied even if the cured layer is thin and easily deformed when the lamination of one or more cured layers forming the upper surface is started. Therefore, it is possible to prevent the deformation of the upper surface of the three-dimensional object and form a smooth upper surface.

The three-dimensional molded object which concerns on 1st Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view which follows a longitudinal direction, (b) is a side view, (c) is a top view, (d) is A of (a). FIG. It is a schematic diagram which shows the principal part of the hardening device used in order to model the three-dimensional molded item which concerns on 1st Embodiment of this invention from a photocurable resin. The manufacturing process of the three-dimensional molded item which concerns on 1st Embodiment of this invention is shown, (a) shows the process of forming the hardened layer of the uppermost part, (b) shows the hardening layer which comprises the upper surface of a three-dimensional molded item, and shows an upper surface. The step of hardening while forming the concave portion is shown, and (c) shows the step of laminating the hardened layer constituting the upper portion of the three-dimensional object. The manufacturing process of the three-dimensional molded object which concerns on 1st Embodiment of this invention is shown, (d) shows the process of forming the hardening layer of a three-dimensional molded object in the upper part of a hollow part, (e) shows the hardened layer of a three-dimensional molded object. Shows the step of forming the side portion of the hollow portion, and (f) shows the step of forming a hole in the cured layer of the three-dimensional molded article at the bottom of the hollow portion. (G) shows the manufacturing process of the three-dimensional molded item which concerns on 1st Embodiment of this invention, and shows the process of forming a hole part in the lower part of the three-dimensional molded item. The three-dimensional molded item which concerns on 2nd Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view which follows a longitudinal direction, (b) is a side view. The irradiation shape which irradiates light by scanning the laser beam from an irradiation part at the time of laminating|stacking the hardening layer of the three-dimensional molded object which concerns on 2nd Embodiment of this invention shows (a) hardening which forms a hollow part. It is an irradiation shape when laminating layers, and (b) is an irradiation shape when laminating a hardened layer forming a concave portion. The three-dimensional molded item which concerns on 3rd Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view which follows a longitudinal direction, (b) is a side view of (a). The irradiation shape which irradiates light by scanning the laser beam from an irradiation part at the time of laminating|stacking the hardening layer of the three-dimensional molded object which concerns on 3rd Embodiment of this invention shows (a) hardening which forms a hollow part. It is an irradiation shape at the time of laminating layers, and (b) is an irradiation shape at the time of laminating a hardened layer forming a concave portion. The three-dimensional molded item which concerns on the other modification of 3rd Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view which follows a longitudinal direction, (b) is a BB sectional view of (a). It is a longitudinal cross-sectional view which shows the three-dimensional molded item which concerns on another modification of 3rd Embodiment of this invention. It is a longitudinal section showing a modification of a hollow part concerning any of the embodiments of the present invention. It is a longitudinal cross-sectional view showing another modification of the hollow portion according to any of the embodiments of the present invention. (A), (b) is a schematic diagram which shows the principal part of the general hardening device for manufacturing a three-dimensional molded item from a photocurable resin. (A)-(c) is a figure explaining the manufacturing process of the conventional three-dimensional molded item, (a) shows the state of the initial stage of manufacture, (b) shows the state of the middle stage of manufacture, (c) shows the manufacture. The state of the latter half is shown. The conventional three-dimensional molded item is shown, (a) is a longitudinal cross-sectional view along a longitudinal direction, (b) is a CC cross-sectional view of (a). It is sectional drawing explaining the state in the middle of manufacture of the conventional three-dimensional molded item.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
1A to 1D are views showing a three-dimensional object according to the first embodiment, FIG. 2 is a view showing an apparatus used for forming the three-dimensional object according to the first embodiment, and FIGS. FIG. 5A to FIG. 5G are diagrams illustrating the modeling process of the three-dimensional modeled object of the first embodiment.

As shown in FIG. 1, the three-dimensional structure 20 of the first embodiment is formed by stacking a large number of cured layers 21 obtained by curing a photocurable resin.
The photocurable resin 12 is a liquid containing a material that is cured by being irradiated with predetermined light, and for example, various compositions can be used.
The three-dimensional modeled object 20 of the present embodiment is a laminated body in which a cured layer 21 obtained by curing the same photocurable resin 12 is laminated in an integrated state, and an interface does not exist between the cured layers 21 adjacent to each other. It is configured as a thing.

The three-dimensional model 20 of FIG. 1 has a substantially rectangular parallelepiped outer shape, and a hollow portion 22 having a substantially circular cross section is provided inside and penetrates substantially horizontally in the longitudinal direction.
The bottom 22a of the hollow portion 22 is provided with a hole portion 24 that is provided continuously from the hollow portion 22 and penetrates between the hollow portion 22 and the lower surface. Here, the bottom 22 a of the hollow portion 22 is the lower end of the hardened layer 21 forming the hollow portion 22 in the stacking direction.

A plurality of hole portions 24 are provided at a plurality of positions along the longitudinal direction on the bottom 22a of the hollow portion 22, and each hole portion 24 has a shape through which the photocurable resin 12 can pass during modeling as described below. .. Specifically, when the intermediate body in the middle of modeling of the three-dimensional model 20 is moved in the vertical direction in the photocurable resin 12 at the time of modeling, the direction and size of the photocurable resin 12 that can pass through are defined in the hole 24. All you need to have is the full length.
On the other hand, the upper surface of the three-dimensional object 20 is provided with a plurality of upper surface recesses 25 that open upward. Here, the upper surface is the upper surface of the uppermost layer in the stacking direction of the hardened layer 21.

The length of these holes 24 and the depth of the upper surface recess 25 are formed to be at least thicker than the hardened layer 21. Thereby, at the time of modeling, the through hole can be surely provided in the hardened layer 21 forming the bottom 22a of the hollow portion 22 and the hardened layer 21 forming the upper surface.

Next, a method for manufacturing such a three-dimensional model 20 of the first embodiment will be described. In this embodiment, for example, the apparatus shown in FIG. 2 is used for manufacturing.
This apparatus includes a storage portion 13 in which a bottom plate 11 is made of a translucent material and a photo-curable resin 12 is supplied, an irradiation unit 14 that scans a laser beam from below the bottom plate 11 into a predetermined shape, and an irradiation unit. The laser light emitted from 14 hardens the photocurable resin 12 immediately above the bottom plate 11 in the storage portion 13 to form a hardened layer 21 having a predetermined shape, and the hardened layer 21 formed. And an elevating/retaining portion 15 capable of holding and elevating.
First, as shown in FIG. 3( a ), the support portion 16 attached to the lifting/lowering holding portion 15 is accurately arranged at a predetermined height from the bottom plate 11 and the storage portion 13 is provided with the shaping portion 13 a. Irradiation is performed to cure the photo-curable resin 12 in the uppermost portion of the three-dimensional structure 20 to form a cured layer 21.

At this time, the distance between the lowermost end of the support portion 16 and the bottom plate 11 is made to correspond to the thickness of the hardened layer 21, which is the uppermost portion of the three-dimensional object 20.
In addition, the irradiation unit 14 irradiates the photocurable resin 12 with light. This light passes through the bottom plate 11 and is applied to the photocurable resin 12, and the photocurable resin 12 is cured in a predetermined shape. Here, by scanning with laser light, the light is emitted in a shape in which the portion corresponding to the upper surface recessed portion 25 is removed so that the shape of the upper surface of the three-dimensional structure 20 as illustrated in FIG. 1C is obtained. ..
As a result, the uppermost portion of the photocurable resin 12 is cured to form a cured layer 21, and the cured cured layer 21 is held in a state of being laminated under the support portion 16.

Next, as shown in FIG. 3( b ), the upper and lower holding layers 15 are moved up and down to arrange the uppermost hardened layer 21 at the raised position, whereby the bottom surface of the uppermost hardened layer 21 and the bottom plate 11 are separated. The distance between them is accurately set to a predetermined interval. In this state, light is irradiated to cure the next layer of the three-dimensional model 20, and the cured layer 21 is laminated. Then, by repeating these steps up to a predetermined thickness, as shown in FIG. 3C, a plurality of hardened layers forming the upper part of the three-dimensional object 20 are formed to form the intermediate body 23.

At this time, when forming the hardened layer 21 in which the upper surface recess 25 is formed, light is irradiated to a portion excluding the portion corresponding to the upper surface recess 25, while on the other hand, when forming the hardened layer 21 in which the upper surface recess 25 is not formed, three-dimensional The entire outer shape of the modeled object 20 is irradiated with light to form each cured layer 21.

Next, as shown in FIGS. 4D and 4E, the intermediate body 23 on which the upper portion of the three-dimensional object 20 is formed is formed in the hollow portion 22 in each cured layer 21 having the outer shape of the three-dimensional object 20. The light of the part where the corresponding part is removed is irradiated from the irradiation part 14. Thereby, the hardened layers 21 from the upper portion of the hollow portion 22 as shown in FIG. 4D to the side portion of the hollow portion 22 as shown in FIG. Stack.

Further, as shown in FIG. 4( f ), the lower surface of the intermediate body 23 in which the upper portion and the side portion of the hollow portion 22 are formed is accurately arranged at a predetermined position from the bottom plate 11 and the outer shape of the three-dimensional molded object 20 is cut into a hole. The photocurable resin 12 is cured by irradiating the portion other than the portion corresponding to the portion 24 with light from the irradiation portion 14, and the cured layer 21 that forms the bottom of the hollow portion 22 is laminated.

After that, as shown in FIG. 5G, by irradiating light from the irradiation unit 14 to the outer shape of the three-dimensional object 20 excluding the portion corresponding to the hole 24, the three-dimensional object 20 is formed while forming the hole 24. The hardened layer 21 that constitutes the lower part of the molded article 20 is laminated.
Thereby, all the hardened layers 21 of the three-dimensional molded item 20 can be laminated and integrated.

In this embodiment, in each step of repeatedly irradiating light from the irradiating unit 14 to stack the respective hardened layers 21 as described above, the hardened layers 21 are stacked on the lower end portion of the supporting unit 16 of the elevating holding unit 15 or immediately before the light irradiation. In order to accurately arrange the lower surface of the hardened layer 21 at a predetermined height from the bottom plate 11, after stacking the hardened layers 21, the elevating/holding unit 15 is largely raised and then lowered, and at the time of the lowering. The position in the height direction is precisely adjusted.

Further, the lower end of the aligned support portion 16 and the distance between the bottom surface of the hardened layer 21 laminated immediately before and the bottom plate 11 are the same in each hardened layer 21.
Then, by solidifying and integrating all the hardened layers 21 by such a method, the three-dimensional object 20 is completed in a state of being laminated on the supporting portion 16, and is separated from the supporting portion 16 and polished as necessary. By performing the post-treatment, the three-dimensional model 20 of the first embodiment can be obtained.

According to the three-dimensional object 20 of the present embodiment as described above, the hollow portion is formed in the three-dimensional object 20 formed by stacking the cured layer 21 formed by irradiating the photocurable resin 12 with light. Since the bottom portion 22a of the hollow portion 22 is provided with the hole portion 24 that is continuous with the hollow portion 22, the one or more cured layers 21 forming the bottom portion 22a of the hollow portion 22 are provided with the respective hardened layers at the portions corresponding to the hole portion 24. There is a through hole penetrating 21.

Therefore, in the process of stacking a large number of hardened layers 21 in order from the top to form the three-dimensional object 20 having the hollow portion 22, one or a plurality of hardened layers 21 forming the bottom 22a of the hollow portion 22 are formed. The bottom 22a of the hollow portion 22 is formed by the hardened layer 21 having a through hole by being laminated on the lower surface of the intermediate body 23 in which the upper portion and the side portion of the intermediate portion 23 are formed.

Accordingly, when the cured layer 21 is laminated thereafter, one or more cured layers 21 forming the bottom 22a of the hollow portion 22 are laminated on the lower surface of the intermediate body 23 in the photocurable resin 12. When the lower surface of the intermediate member 23 is moved up and down to be placed at a predetermined position, the photo-curable resin 12 can pass through the through-hole of the hardened layer 21 forming the bottom 22a of the hollow portion 22. Therefore, even if the hardened layer 21 forming the bottom 22a of the hollow portion 22 is thin and easily deformed, it is possible to prevent the fluid pressure of the photocurable resin 12 from being excessively loaded, and the bottom of the hollow portion 22 is prevented. It is possible to prevent deformation of the hardened layer 21 that constitutes 22a.
As a result, when the fully cured layer 21 is laminated to complete the three-dimensional structure 20, the hollow portion 22 having a predetermined shape can be accurately formed.

Further, according to the three-dimensional modeled object 20 of the present embodiment, since the hole 24 has a shape that allows the photo-curable resin 12 to easily pass therethrough, the hole 24 located below the bottom 22a of the hollow part 22 during modeling. When all the hardened layers 21 are laminated, the photo-curable resin 12 can easily pass through each hardened layer 21, and deformation of all the hardened layers 21 due to fluid pressure can be reliably prevented.

Further, according to the three-dimensional object 20 of the present embodiment, the upper surface recessed portion 25 is provided on the upper surface. Therefore, the one or more cured layers 21 forming the upper surface of the three-dimensional object 20 have a portion corresponding to the upper surface recessed portion 25. There is a through hole in. Therefore, at the initial stage of stacking the hardened layer 21, for example, when the hardened layer 21 constituting the upper surface is moved up and down in the photocurable resin 12 and arranged at a predetermined position, the hardened layer 21 of the photocurable resin 12 constitutes the upper surface. Can pass through holes.
As a result, even if each hardened layer 21 is thin and easily deformed at the initial stage of stacking the hardened layer 21, it is possible to prevent the fluid pressure of the photocurable resin 12 from being excessively applied, and the solid modeling object 20 can be easily manufactured. It is possible to prevent deformation and form the upper surface into a planar shape.

[Second Embodiment]
6A and 6B and FIGS. 7A and 7B show a three-dimensional modeled object 20 according to the second embodiment.
The three-dimensional model 20 of the second embodiment is provided with a plurality of recesses 27 that are open toward the hollow portion 22 and are arranged in the longitudinal direction at the bottom 22 a of the hollow portion 22. Each recess 27 has the same diameter as the hole 24 of the first embodiment.
Others are configured similarly to the three-dimensional model 20 of the first embodiment.

Like the three-dimensional object 20 of the first embodiment, the three-dimensional object 20 of the second embodiment can be manufactured by the same method using the apparatus shown in FIG.
At this time, in this embodiment, after forming the upper portion of the three-dimensional molded object 20, the hardened layers 21 are stacked while the hollow portion 22 is provided to form the intermediate body 23.

Then, as shown in FIG. 7A, a laser beam is irradiated from the irradiation unit 14 to a portion of the outer shape of the three-dimensional object 20 excluding the portion corresponding to the hollow portion 22 to sequentially cure the photocurable resin 12. After the hardened layer 21 is laminated, as shown in FIG. 7B, by irradiating the outer shape of the three-dimensional object 20 with light except for the portions corresponding to the plurality of recesses 27, the three-dimensional object 20 is irradiated. Form the bottom.

Next, after forming the plurality of recesses 27, light corresponding to the outer shape of the three-dimensional object 20 is irradiated from the irradiation unit 14 to stack the hardened layer 21 forming the bottom of the recess 27, and the intermediate body. The bottom surface of the concave portion 27 is integrally formed by laminating on the lower surface of the concave portion 23.
After that, as in the case of stacking another hardened layer 21 on the lower surface of the hardened layer 21 that forms the bottom of the recess 27, an intermediate body in which the supporting unit 16 and a large number of hardened layers 21 are stacked and integrated by the lifting/lowering holding unit 15. By raising and lowering 23, the lower surface of the intermediate body 23 is raised and lowered in the photocurable resin 12.

Then, the fluid pressure of the photocurable resin 12 is applied to the thin hardened layer 21 forming the bottom of the recess 27, but in the second embodiment, the recess 27 has a cross-sectional shape similar to that of the hole 24 of the first embodiment. However, since it is sufficiently smaller than the shape of the hollow portion 24, the bottom of each recess 27 is not deformed, or the three-dimensional object 20 of the second embodiment can be manufactured to the extent that minute deformation is generated. it can.

Even with the three-dimensional model 20 of the second embodiment as described above, it is possible to obtain the same effect as that of the first embodiment.
That is, in the second embodiment, since the recess 27 is provided instead of the hole 24 of the first embodiment, the recesses 27 correspond to the one or more cured layers 21 forming the bottom 22a of the hollow portion 22. There is a through hole penetrating each hardened layer 21 at the portion to be formed. Particularly in the second embodiment, since the recess 27 has a depth equal to or larger than the thickness of the hardened layer 21, when the hardened layer 21 is sequentially laminated in the photocurable resin 12, the hardened layer forming the bottom 22a of the hollow portion 22 is formed. The through hole can be surely present in 21.

Accordingly, when the cured layer 21 is laminated thereafter, when the cured layer 21 forming the bottom 22a of the hollow portion 22 is laminated, the photocurable resin 12 is moved up and down in the state where the cured layer 21 is moved up and down. It can pass through the through hole of the hardened layer 21 that constitutes the bottom 22 a of the hollow portion 22. Therefore, even if the hardened layer 21 forming the bottom 22a of the hollow portion 22 is thin and easily deformed, it is possible to prevent the fluid pressure of the photocurable resin 12 from being excessively loaded, and the bottom of the hollow portion 22 is prevented. It is possible to prevent deformation of the hardened layer 21 that constitutes 22a and accurately form the hollow portion 22 having a predetermined shape.

[Third Embodiment]
FIGS. 8A and 8B show a three-dimensional object 20 according to the third embodiment.
In the three-dimensional model 20 of the third embodiment, a bottom portion 22 a of the hollow portion 22 is provided with a recess 27 that opens toward the hollow portion 22 in a continuous shape in the longitudinal direction.
The concave portion 27 has a depth capable of accommodating the deformed portion 28 generated in the hardened layer 21 forming the bottom of the concave portion 27 when manufactured using the photocurable resin 12 as described later.
Others are configured similarly to the three-dimensional model 20 of the first embodiment.

Like the three-dimensional object 20 of the first embodiment, the three-dimensional object 20 of the third embodiment can be manufactured by the same method using the apparatus shown in FIG.
At this time, in this embodiment, after forming the upper part of the three-dimensional object 20, as shown in FIG. Light is irradiated from 14 to sequentially cure the photo-curable resin 12 to stack the cured layer 21 and form the intermediate body 23 while providing the hollow portion 22.

Next, as shown in FIG. 9B, by irradiating the external shape of the three-dimensional object 20 with light except for the portion corresponding to the concave portion 27, the concave portion 27 of the concave portion 27 can be formed while providing the concave portion 27 continuous in the longitudinal direction. The lower part of the three-dimensional molded object 20 which becomes both sides is formed.
Then, the hardened layer 21 that forms the bottom of the recess 27 is integrally laminated to form the bottom of the recess 27.

Then, the next hardened layer 21 is laminated on the lower surface of the hardened layer 21 forming the bottom of the recess 27, but the thin hardened layer 21 forming the bottom of the recess 27 is loaded with the fluid pressure of the photocurable resin 12. Therefore, the bottom of the recess 27 is deformed toward the hollow portion 22 side. By further laminating the hardened layer 21 thereunder, the deformed portion 28 is formed inside the recess 27.
However, in the third embodiment, since the concave portion 27 has a sufficient depth for the deformation amount of the deforming portion 28, the deforming portion 28 is formed only in the concave portion 27, and the third embodiment The three-dimensional molded object 20 of is modeled.

Even with the three-dimensional model 20 of the third embodiment as described above, the same operational effects as those of the first embodiment can be obtained.
Furthermore, according to the third embodiment, since the recess 27 has a depth capable of accommodating the deformation generated in the hardened layer 21 forming the bottom of the recess 27, a large number of hardened layers 21 are stacked to form the recess 27. When the cured layer 21 that forms the bottom of the recess 27 is laminated on the lower surface of the intermediate body 23 on which the side surface of the recess 27 is formed, the fluid of the photocurable resin 12 is added to the cured layer 21. Even if it is deformed by the pressure, it is deformed in the concave portion 27 and has no influence on the shape of the hollow portion 22. Therefore, it is possible to accurately form the inside of the hollow portion 22 in a desired shape with the bottom 22a of the hollow portion 22 formed.

[Modification of Third Embodiment]
FIG. 10 shows a three-dimensional object 20 according to a modified example of the third embodiment.
In the three-dimensional object 20 of this modified example, both end sides in the longitudinal direction of the concave portion 27 are formed by closing the both end surfaces of the three-dimensional object 20 without opening. Others have the same configuration as the third embodiment and are manufactured in the same manner.
Even with such a three-dimensional model 20, the same operational effect as that of the three-dimensional model of the third embodiment can be realized.
Moreover, in this modified example, since both ends of the concave portion 27 are closed, only the shape of both end surfaces of the hollow portion 22 is visually recognized in a side view, so that the outer shape can be simplified.

FIG. 11 shows a three-dimensional object 20 according to another modification of the third embodiment.
In the three-dimensional model 20 of this modified example, the hollow portion 22 has the shape of an end hole vertically provided from the uppermost surface of the three-dimensional model 20. The horizontal cross-sectional shape of the hollow portion 22 may be circular or polygonal, for example.
A recess 27 having a horizontal cross-sectional shape smaller than that of the hollow portion is provided at the bottom of the hollow portion 22.

Others are the same as in the third embodiment, and when a large number of hardened layers 21 are formed, light is emitted from the irradiation unit 14 to a portion other than the portion corresponding to the shape of the hollow portion 22, thereby forming each By laminating and integrating the hardened layers, it is possible to manufacture in the same manner as in the third embodiment.

Even with the three-dimensional object 20 of such a modified example, the same effect as that of the third embodiment can be obtained, and the deformed portion 28 is formed in the recess 27, so that the hollow portion 22 is formed into a predetermined shape. It is possible to form with high precision.

The first to third embodiments described above can be appropriately modified within the scope of the present invention.
For example, in the above-described first to third embodiments, the three-dimensional object 20 has a substantially rectangular parallelepiped outer shape and is provided with one hollow portion 22 therein. The shape is not limited at all, and may be any shape as long as it can be formed by laminating the cured layer 21 formed by irradiating the photocurable resin 12 with light.

Further, in the above-described first to third embodiments, the example in which the hollow portion 22 has a circular cross section and the hollow portion 22 penetrating in the longitudinal direction is provided has been described, but the hollow portion 22 is not limited thereto. For example, it is possible to provide a hollow portion having a polygonal cross-section inside the three-dimensional object 20. Further, a hollow portion whose one or both ends are closed may be provided, and a hollow portion whose entire circumference is closed is provided. It is also possible to provide.
Further, as shown in FIG. 12, the hollow portion 22 and the concave portion 27 are provided so that the vertical cross-section has an inverted triangular shape over the entire length in the longitudinal direction, or the vertical cross-section has a circular shape over the entire length in the longitudinal direction as shown in FIG. The hollow portion 22 and the concave portion 27 may be provided so as to have a shape having a plurality of semicircular convex portions 22b on the inner surface.
Further, as shown by phantom lines in FIG. 12, a cylindrical portion having a circular vertical cross section is provided, and a hollow portion is formed in a part or a plurality of portions in the longitudinal direction so as to be expanded into a substantially triangular shape from a plurality of positions in the circumferential direction of the cylindrical portion. The portion 22 and the concave portion 27 may be provided so that the cylindrical portion is supported by the inverted triangle.
Further, as shown in phantom lines in FIG. 13, a cylindrical portion having a circular vertical cross section is provided, and a hollow portion is formed in a part or a plurality of portions in the longitudinal direction so as to be expanded into a fan shape from a plurality of positions in the circumferential direction of the cylindrical portion. 22 and the concave portion 27 may be provided, and the cylindrical portion may be supported by a plurality of semicircular convex portions 22b.

Further, in the above-described first to third embodiments, an example in which the shaping portion 13a is laminated with the hardening layer 21 having a predetermined shape by scanning the shaping section 13a with laser light in a shape corresponding to the planar shape of each hardening layer 21 in the first to third embodiments. Although explained, it is not particularly limited. For example, the illumination unit 14 that irradiates the modeling unit 13a with light having a predetermined shape corresponding to the planar shape of each cured layer 21 by a projector may be used.
Further, in the first to third embodiments, the example in which only one of the hole 24 and the recess 27 is provided has been described, but both the hole 24 and the recess 27 are provided in the same three-dimensional model. Good.

X Deformation part 11 Bottom plate 12 Photocurable resin 13 Reservoir 13a Modeling part 14 Irradiating part 15 Elevating/holding part 16 Support part 20 Three-dimensional model 21 Hardened layer 22 Hollow part 22a Bottom 23 Intermediate 24 Hole 25 Top recess 27 Recess 28 Deformation part

Claims (4)

A three-dimensional object having a hollow portion, which is formed by stacking a cured layer formed by irradiating light on a photocurable resin,
At least one of a hole or a recess that is continuous with the hollow portion is provided on the bottom of the hollow portion. The three-dimensional structure according to claim 1, wherein the recess has a depth equal to or larger than the thickness of the hardened layer. The three-dimensional molded object according to claim 1 or 2, wherein the recess has a depth capable of accommodating a deformation generated in the hardened layer forming the bottom of the recess. The three-dimensional modeled article according to claim 1, wherein an upper surface recess is provided on the upper surface.

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