JP2676917B2 - 3D shape forming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The three-dimensional shape forming method of the present invention will be described in detail according to the following items.

A. Industrial field of use B. Outline of the invention C. Prior art [Fig. 7] D. Problems to be solved by the invention [Figs. 7 and 8] E. Means for solving the problems F. Example [Figs. 1 to 6] a. Three-dimensional shape forming device [Figs. 1 to 3] a-1. Storage container [Figs. 1 and 2] a-2. Work table a-3 . Beam scanning unit [Figs. 1 and 2] a-4. Control unit [Figs. 1 and 3] b. Stereoscopic image forming method [Figs. 1, 4, 5] b-1 .Formation of precoat layer [Fig. 5] b-2. Formation of three-dimensional shape [Figs. 1 and 4] b-3. Modification of precoat layer forming method [Fig. 6] G. Effect of the invention (A . Field of Industrial Application) The present invention relates to a novel three-dimensional shape forming method. More specifically, the liquid ultraviolet ray curable resin material positioned on the upper surface of the work table with a predetermined thickness is irradiated with a beam to selectively cure the liquid ultraviolet ray curable resin material to form a first cured resin layer. Then, a liquid ultraviolet curable resin material having a predetermined thickness is positioned on the first curable resin layer, beam irradiation is performed to selectively cure the liquid ultraviolet curable resin material, and the liquid ultraviolet curable resin material is first cured on the first curable resin layer. 2 cured resin layers are laminated, and similarly, the third, fourth, ...
Regarding the improvement of the method for forming a three-dimensional shape by sequentially laminating cured resin layers,
An object of the present invention is to provide a novel three-dimensional shape forming method that prevents the cured resin layer from peeling off from the work table.

(B. Outline of the Invention) The method for forming a three-dimensional shape of the present invention is to position a liquid ultraviolet curable resin material having a desired thickness on the upper surface of a work table, and cure the liquid ultraviolet curable resin material with an ultraviolet irradiation lamp. A precoat layer having a planar shape larger than the planar shape of the three-dimensional first layer to be formed is formed, and a cured resin layer is sequentially laminated on the precoat layer, thereby contacting the work table. It is possible to prevent the cured resin layer from peeling off from the work table during the formation of the three-dimensional shape by preventing the stress that causes peeling between the existing resin layer and the work table.

(C. Prior art) [FIG. 7] Beam irradiation is performed on the liquid ultraviolet curable resin material positioned on the upper surface of the work table with a predetermined thickness to selectively cure the liquid ultraviolet curable resin material. A first curable resin layer is formed, and then a liquid ultraviolet curable resin material having a predetermined thickness is placed on the first curable resin layer, and beam irradiation is performed to selectively cure the liquid ultraviolet curable resin material. The second cured resin layer is laminated on the cured resin layer, and similarly, the third, fourth, ...
A method of forming a three-dimensional shape by sequentially stacking cured resin layers is known.

Such a three-dimensional shape forming method is schematically shown in FIG.

Reference numeral a denotes a container, and the liquid ultraviolet curable resin material b is contained in the container a.

Reference numeral c is an elevator, which is screwed with a feed screw e rotated by a motor d, and is vertically moved by the rotation of the feed screw e.

Reference numeral f denotes a work table, which is supported by the elevator c and is vertically movable in the liquid ultraviolet curable resin material b housed in the housing container a.

Therefore, first, in a state in which one layer of the liquid ultraviolet curable resin material b is positioned on the work table f, the beam g is selectively irradiated onto the liquid ultraviolet curable resin material b to selectively cure the liquid ultraviolet curable resin material b. To form the first cured resin layer h ₁ (FIG. 7 (A)).
Next, the work table f is lowered to position the liquid ultraviolet curable resin material b with a predetermined thickness on the previously formed first curable resin layer h ₁ , and the beam g is applied thereto. The second cured resin layer h ₂ is formed by irradiating and curing and adhering to the first cured resin layer h ₁ (see FIG. 7 (B)), and similarly in the same manner, the cured resin layers h, h, .. are laminated to form a three-dimensional shape.

(D. Problem to be Solved by the Invention) [FIGS. 7 and 8] By the way, in the above-described three-dimensional shape forming method, the cured resin layer h ₁ is placed on the work table f during the formation of the three-dimensional shape.
There is a fear of peeling from.

This is because when the liquid ultraviolet curable resin material b located on the first curable resin layer h ₁ is irradiated with the beam g, as shown schematically in FIG. Resin layer h ₁
The upper layer portion i (portion shown with satin in the drawing) is further cured, and the shrinkage upon curing of the upper layer portion i becomes larger than the shrinkage of the lower layer portion j, whereby the first cured resin layer internal stress generated in h ₁ is from acting the periphery of the cured resin layer h ₁ in the direction to peel the worktable f.

Then, if the cured resin layer h is peeled off from the work table f, the three-dimensional shape cannot be formed.

(E. Means for Solving the Problem) The three-dimensional shape forming method of the present invention, in order to solve the above problems, a liquid ultraviolet curable resin material having a desired thickness is placed on the upper surface of a work table, and the liquid ultraviolet curable is set. The mold resin material is cured by an ultraviolet irradiation lamp to form a precoat layer having a plane shape larger than the plane shape of the three-dimensional first layer to be formed, and the cured resin layer is sequentially laminated on the precoat layer. I tried to go.

Therefore, in the method for forming a three-dimensional shape of the present invention, since the precoat layer is cured by the ultraviolet irradiation lamp, it is sufficiently cured, and the liquid ultraviolet curable resin material positioned on the layer is irradiated with the beam. However, since the internal stress that causes peeling from the work table is no longer generated, the adhesive force between the work table and the work table can be sufficiently maintained, and the cured resin laminated on the precoat layer. Internal stress that causes warpage occurs in the layer, but since the adhesive force between the layer and the precoat layer is strong enough to overcome the internal stress, it is prevented from peeling from the precoat layer, and the flat surface of the precoat layer. Since the shape is formed to be larger than the planar shape of the three-dimensional first layer to be formed, internal stress generated in the cured resin layer laminated on the precoat layer causes the precoat layer to work. Also not a fear to be peeled off from.

Therefore, according to the three-dimensional shape forming method of the present invention, a three-dimensional shape can be formed without peeling from the work table in the middle.

(F. Embodiment) [FIGS. 1 to 6] The details of the three-dimensional shape forming method of the present invention will be described below with reference to the illustrated embodiment.

Before describing the three-dimensional shape forming method of the present invention, an example 1 of a three-dimensional shape forming apparatus for carrying out the three-dimensional shape forming method of the present invention will be described.

(A. Three-dimensional shape forming device) [Figs. 1 to 3] (a-1. Storage container) [Figs. 1 and 2] 2 is a storage container in which a liquid ultraviolet curable resin material is placed. 3 are accommodated.

The liquid ultraviolet curable resin material 3 is required to be a liquid that is cured by being irradiated with ultraviolet rays, and to have an adhesive property to be fixed to the surface of the already cured portion when being cured. . An example of the liquid ultraviolet curable resin material 3 having such characteristics is ultraviolet light curable modified acrylate.

(A-2. Work Table) 4 is an elevator, and a work table 5 having a horizontal plate shape is detachably provided at the lower end portion thereof. Work table 5
Is made of metal, and its upper surface 5a is a horizontal surface.

A nut 7 is fixed to an upper end portion 6 of the elevator 4, the nut 7 is screwed with a feed screw 9 rotated by a stepping motor 8, and the feed screw 9 is rotated so that the nut 7 is fixed to the feed screw 9. It is moved axially along which causes the elevator 4 to move up and down.

The work table 5 of such an elevator 4 is located in the liquid ultraviolet curable resin material 3 housed in the housing container 2 and is stepwise moved at a predetermined pitch.

(A-3. Beam Scanning Section) [FIGS. 1 and 2] 10 is a beam scanning section.

Reference numerals 11 and 12 denote the exposure beam oscillated from a laser beam oscillator, which will be described later, with respect to the liquid surface 3a of the liquid ultraviolet curable resin material 3 in the left-right direction in FIG. 2 (hereinafter, this direction is referred to as "first scanning direction") And a beam scanner for scanning in a direction orthogonal to the first scanning direction (hereinafter, referred to as a "second scanning direction"), and is a rotation that is rotated at a high speed in the axial direction. It is provided with drive units 14 and 14 'having shafts 13 and 13' and swing mirrors 15 and 15 'fixed to the rotary shafts 13 and 13'.

And one of these two beam scanners 11 and 12
Reference numeral 11 (hereinafter, referred to as “first beam scanner”) has a rotating shaft 13 whose axial direction extends in a direction parallel to the second scanning direction, and a swinging mirror 15 which causes a work mirror 5 of the elevator 4. And the other beam scanner 12 (hereinafter, referred to as "second beam scanner").
The rotating shaft 13 'extends in the vertical direction, and the reflecting surface 15'a of the swing mirror 15' faces the reflecting surface 15a of the swing mirror 15 of the first beam scanner 11 from the side. Are arranged as follows.

16 is a predetermined exposure beam 17, for example, an argon ion laser with a wavelength of 360 nm (nanometer) or a wavelength of 32
A laser beam oscillator for oscillating a 5 nm helium-cadmium laser, 18 and 19 sequentially totally reflect an exposure beam 17 oscillated from the laser beam oscillator 16 in a predetermined direction to oscillate the second beam scanner 12. A total reflection mirror for entering the mirror 15 ', 20 is an A / O modulator (acousto-optic modulator) arranged between these two total reflection mirrors 18 and 19, and 21 is one total reflection mirror 19 A focus controller having a focusing lens 22 arranged between the second beam scanner 12 and the second beam scanner 12.

Then, the exposure beam 17 oscillated from the laser beam oscillator 16 is transmitted by the total reflection mirror 18 to the A / O modulator 2
The light is reflected toward 0, and the progress of light from the A / O modulator 20 is controlled by the switching action of the light deflection state in the A / O modulator 20.
When the switching is on, the light enters the total reflection mirror 19 and is reflected there toward the focusing lens 22, and when passing through the focusing lens 22, the light beam is narrowed and the two oscillating mirrors 15 ′, 15 The liquid ultraviolet curable resin material 3 is sequentially reflected by and is irradiated with information from the information. The exposure beam 17 is focused on the liquid surface 3a of the liquid ultraviolet curable resin material 3 by a focusing lens 22 so that the exposure beam 17 is always focused and irradiated by a beam spot 17a having a predetermined diameter. When the rotary shaft 13 of the first beam scanner 11 is rotated and the swing mirror 15 is swung, the liquid surface 3a of the liquid ultraviolet curable resin material 3 is scanned in the first scanning direction, When the rotating shaft 13 'of the second beam scanner 12 is rotated and its swing mirror 15' is swung, the liquid surface 3a of the liquid ultraviolet curable resin material 3 is scanned in the second scanning direction. It

(A-4. Controller) [FIGS. 1 and 3] Reference numeral 23 is a controller.

24 is an elevator position detection sensor arranged in parallel with the feed screw 9, 25 is an elevator controller, and a signal indicating the position of the elevator 4 detected by the sensor 24 is input, and the stepping motor is operated in accordance with the signal. The rotation of the elevator 4 is controlled, which controls the position of the elevator 4.

26 is an A / O modulator controller that controls the switching operation of the A / O modulator 20, 27 is a galvano controller, and the operations of the A / O modulator controller 26, the beam scanners 11, 12 and the focus controller 21 are as described above. It is controlled by a command from the galvano controller 27.

 28 is a circuit of such a control unit 23.

29 is a stereoscopic image programming device not shown, for example,
It is a memory connected to a so-called CAD, and receives data signals decomposed in the X direction and Y direction of an exploded plane that is obtained by dividing a three-dimensional shape arbitrarily designed by a three-dimensional shape programming device into several slices. Is temporarily stored.

Reference numeral 30 denotes a modulation circuit connected to the memory 29, and the individual data signals of the decomposition plane temporarily stored in the memory 29 are rasterized in this modulation circuit 30, that is, the liquid ultraviolet curable resin material 3 of the exposure beam 17 is used. Is converted into a coordinate signal indicating the position of the liquid surface 3a with respect to the scanning region.

Reference numeral 31 is a beam position control circuit including the memory 29 and the modulation circuit 30.

32a and 32b are D / A conversion circuits connected to the modulation circuit 30, 33a and 33b are specially connected to the D / A conversion circuits 32a and 32b, and the first beam scanner 11 and the second beam scanner 12 And a gate connected to each
The signal in the X direction, that is, the signal in the first scanning direction, of the coordinate signals converted in (1) is converted into an analog signal in the D / A conversion circuit 32a, and then is passed through the gate 33a to the driving unit 14 of the first beam scanner 11. The coordinate signal in the Y direction, that is, the second scanning direction is output to the driving unit 14 'of the second beam scanner 12 via the gate 33b after being converted into an analog signal in the D / A conversion circuit 32b. The driving units 14 and 14 'swing the swing mirrors 15 and 15', respectively, while inputting respective signals.

Reference numeral 34 is a line scanning direction switching circuit, that is, a circuit for sequentially switching the raster scanning line direction of the beam spot 17a of the exposure beam 17 between the first scanning direction and the second scanning direction. Line scan direction switching circuit
It is opened / closed by a command from 34 and the line scanning direction is switched to the first scanning direction or the second scanning direction every time the raster scanning for one decomposition plane is completed. That is, when the scanning of the exposure beam 17 on one decomposition plane is performed with the first scanning direction as the line scanning direction, the scanning of the exposure beam 17 on the next decomposition plane is performed with the second scanning direction as the line scanning direction. Then, for the subsequent decomposition plane, the first scanning direction is set as the line scanning direction. Therefore, when the line scanning direction is set to the first scanning direction, the gate 33b is momentarily opened each time scanning of one scanning line in the first scanning direction is completed, whereby the gate of the second beam scanner 12 is opened. The oscillating mirror 15 'is slightly rotated to move the line position of the line scanning of the exposure beam 17 to the adjacent line in the second scanning direction. Further, when the line scanning direction is set to the second scanning direction, the gate 33a of the exposure beam 17 is momentarily opened each time scanning of one scanning line in the second scanning direction is completed, whereby the first scanning line is opened. The oscillating mirror 15 of the beam scanner 11 is slightly rotated to move the line position of the line scanning of the exposure beam 17 to the adjacent line in the first scanning direction.

Reference numeral 35 denotes an A / O modulator drive circuit connected to the beam position control circuit 31, which outputs a control signal depending on the presence / absence of a signal on one line in the X direction or one line in the Y direction of the plane data. The light beam is outputted to the transducer of the O modulator 20 and the exposure beam 17 oscillated from the laser beam oscillator 16 is turned on / off in the optical path from the A / O modulator 20.

Reference numeral 36 denotes a focus control circuit, which focuses the exposure beam 17 on the liquid surface 3a of the liquid ultraviolet curable resin material 3 with a spot having a predetermined diameter at all times.
Controls the position of the in the focusing direction.

Reference numeral 37 denotes a motor drive circuit, and the stepping motor 8 is driven by a command from the motor drive circuit 37, and when the drive starts a three-dimensional shape forming operation, the elevator 4 is placed on the upper surface 5a of the work table 5. Is controlled so that the upper surface of the same pre-coat described later provided on the liquid ultraviolet curable resin material 3 is moved to a position below the liquid surface 3a of the liquid ultraviolet curable resin material 3 by one layer pitch (hereinafter, referred to as an initial position). Also,
After the formation operation is started, the elevator 4 is controlled to move downward by one pitch each time the formation of one decomposition plane is completed.

(B. Three-dimensional image forming method) [FIG. 1, FIG. 4, FIG. 5] Then, the three-dimensional shape is formed using the above-described three-dimensional shape forming apparatus 1 as follows.

The designed three-dimensional shape is the three-dimensional shape 38 shown in FIG.

(B-1. Formation of Precoat Layer) [FIG. 5] First, a precoat layer is formed on the upper surface 5 a of the work table 5.

The work table 5 is removed from the elevator 4 and taken out of the container 2, and the liquid ultraviolet curable resin material 3 is thinly applied to the upper surface 5a of the work table 5 (see FIG. 5 (A)).

Then, the liquid ultraviolet curable resin material 3 on the work table 5 is irradiated with ultraviolet rays by the ultraviolet irradiation lamp 39 to sufficiently cure the liquid ultraviolet curable resin material 3 to form the precoat layer 40 (see FIG. 5 ( See B)). As a result, the precoat layer 40, which has been cured to such an extent that no internal stress is generated even when the exposure beam 17 is irradiated through the liquid ultraviolet curable resin material 3 having a thickness of one layer pitch, is formed in close contact with the upper surface 5a of the work table 5. It

The precoat layer 40 does not have to be formed over the entire upper surface 5a of the work table 5, and it is sufficient that the precoat layer 40 is sufficiently larger than the plane shape in the exploded plan view of the lowermost layer in forming the three-dimensional shape 38. Is.

The thickness of the precoat layer 40 is preferably about 0.2 to 2.0 mm (millimeter), but it is not limited to this range.

(B-2. Formation of Solid Shape) [FIGS. 1 and 4] Next, the work table 5 having the precoat layer 40 formed on the upper surface 5a is attached to the elevator 4, and then the solid shape forming operation is started. .

Therefore, when the three-dimensional shape forming operation is started, first, the elevator 4 is moved to the initial position, and the liquid ultraviolet curable resin material 3 flows into the upper side of the upper surface 5a of the work table 5 of the elevator 4 above the precoat layer 40 to form one layer. It is located with a pitch thickness. The thickness for this one-tier pitch is 0.2 to 2.0 mm
The range is preferable, but is not limited to this.

Then, from this state, raster scanning is performed on a region of the liquid surface 3a of the liquid ultraviolet curable resin material 3 of the exposure beam 17 corresponding to the precoat layer 40. The raster scanning is performed on each of the decomposition planes of the three-dimensional shape, and the order is sequentially performed from one of the two decomposition planes at both ends in the Z direction among the many decomposition planes. Further, the scanning on one decomposition plane is performed with the line scanning direction as either the first scanning direction or the second scanning direction. When the first scanning direction is the line scanning direction, the scanning is performed with the first scanning direction.
Line scanning is performed by oscillating the oscillating mirror 15 of the beam scanner 11, and the oscillating mirror 15 'of the second beam scanner 12 is rotated by an angle corresponding to one line pitch each time one line scanning is completed. By moving the line position of the line scanning sequentially in the second scanning direction, the raster scanning for the one decomposition plane is performed, and when the second scanning direction is the line scanning direction, the first scanning is performed. Line scanning is performed by oscillating the oscillating mirror 15 'of the second beam scanner 12, and each time one line scanning is completed, the oscillating mirror 15 of the first beam scanner 11 is rotated by an angle corresponding to one line pitch. By rotating and sequentially moving the line position of the line scanning in the first scanning direction, scanning is performed on the one decomposition plane.

In this way, when raster scanning of the exposure beam 17 on the liquid surface 3a of the liquid ultraviolet curable resin material 3 on one decomposition plane is completed, the area of the liquid surface 3a raster-scanned by the exposure beam 17 is It is cured, thereby forming one cured resin layer 41 having the same shape as the decomposition plane to be formed first. In FIG. 4, broken lines 42, 42 partially shown in these cured resin layers 41, 41 ,.
... or 43, 43, ... denotes the line scan direction, for example, the cured resin layer 41 ₁ is a first scanning direction exposure beam 17
Is formed as the line scanning direction.

If the first cured resin layer 41 ₁ is formed, the cured resin layer 41 ₁ is laminated and bonded on the precoat layer 40.

When one cured resin layer 41 ₁ is formed, the elevator 4 is moved downward by one layer pitch. As a result, the liquid ultraviolet curable resin material 3 flows into the already formed cured resin layer 41 _{1 with} a thickness of one layer pitch.

From this state, the next order, that is, the raster scanning of the exposure beam 17 with respect to the second decomposition plane is performed. In this case, the line scanning direction of the exposure beam 17 is the second scanning direction.

As a result, the cured resin layer 41 corresponding to the second decomposition plane is formed.
₂ is formed, and when the cured resin layer 41 ₂ is cured,
It is adhered to the upper surface of the first cured resin layer 41 ₁ .

Then, by repeating such an operation, a large number of the cured resin layers 41 ₁ , 41 ₂ , ..., 41 _n are stacked on the work table 5, whereby a three-dimensional shape is obtained.
A three-dimensional shape 44 having the same three-dimensional shape as the three-dimensional shape of 38 is formed.

As described above, when the line scanning directions of the cured resin layers 41, 41, ... Are made to be directions orthogonal to each other between the adjacent cured resin layers, the warpage due to the contraction action at the time of curing is caused. Therefore, even if there is a portion 44a that is positioned so as to project from some other portion, such as the three-dimensional shape 44 illustrated, the portion 44a does not significantly warp. Further, since the line scanning direction is different for every other hardened layer, the start point and the end point of this line scanning do not appear on only one side surface of the three-dimensional shape 44, and therefore, any side surface obtains a three-dimensional image of a smooth surface. be able to.

However, the line scanning direction according to the three-dimensional shape forming method of the present invention does not have to be different between adjacent cured resin layers, and each layer may scan lines in the same direction.

(B-3. Modified Example of Precoat Layer Forming Method) [FIG. 6] The precoat layer can be formed on the upper surface 5a of the work table 5 by the following method.

A storage container 45 different from the storage container 2 for forming the three-dimensional shape
A liquid ultraviolet curable resin material 3 similar to the liquid ultraviolet curable resin material 3 for forming a three-dimensional shape is housed therein.

Then, the work table 5 removed from the elevator 4 is held at a predetermined depth in the liquid ultraviolet curable resin material 3 in the container 45.

 Reference numeral 46 denotes a transparent plate, which is made of PMMA, for example.

Then, the transparent plate 46 is placed on the liquid ultraviolet curable resin material 3 in the container 45 in a state of facing the upper surface 5a of the work table 5. As a result, the transparent plate 46 floats in the liquid UV curable resin material 3 in a state of being slightly submerged, and the work table 5
Liquid ultraviolet curable resin material 3 between the upper surface 5a of the plate and the transparent plate 46.
Are located in thin layers (see FIG. 6 (A)).

Then, the ultraviolet irradiation lamp 39 irradiates ultraviolet rays through the transparent plate 46 to cure the portion of the liquid ultraviolet curable resin material 3 located between the transparent plate 46 and the work table 5 in a layered manner (see FIG. )reference).

As a result, the layer-hardened precoat layer 47 is formed on the upper surface 5a of the work table 5, so that the transparent plate 46 is removed and the work table 5 is taken out from the liquid ultraviolet curable resin material 3 in the container 45.

Since the upper surface of the precoat layer 47 is a surface that follows the surface of the transparent plate 46 facing the work table 5 upper surface 5a, if the flatness of the transparent plate 46 is improved, the thin and flat surface can be obtained. A good precoat layer 47 can be formed.

After that, the work table 5 having the precoat section 47 formed on the upper surface 5a may be attached to the elevator 4, and the three-dimensional shape may be formed on the precoat layer 47 in the same manner as described above.

(G. Effects of the Invention) As is apparent from the above description, the method for forming a three-dimensional shape of the present invention performs beam irradiation on a liquid ultraviolet curable resin material positioned on the upper surface of a work table with a predetermined thickness. By selectively curing the liquid ultraviolet curable resin material
First, a liquid ultraviolet curable resin material having a predetermined thickness is placed on the first curable resin layer, and beam irradiation is performed to selectively cure the liquid ultraviolet curable resin material to perform the first curing. A second cured resin layer is laminated on the resin layer, and similarly,
A method for forming a three-dimensional shape by sequentially stacking cured resin layers in the order of third, fourth, ..., Wherein a liquid ultraviolet curable resin material having a desired thickness is positioned on the upper surface of a work table, The liquid ultraviolet curable resin material is cured by an ultraviolet irradiation lamp to form a precoat layer having a plane shape larger than that of the three-dimensional first layer to be formed, and the cured resin layer is formed on the precoat layer. The feature is that they are stacked.

Therefore, in the method for forming a three-dimensional shape of the present invention, since the precoat layer is cured by the ultraviolet irradiation lamp, it is sufficiently cured, and the liquid ultraviolet curable resin material positioned on the layer is irradiated with the beam. However, since internal stress that causes peeling from the work table is no longer generated, a sufficient adhesion force between the work table and the work table can be maintained, and a cured resin layer laminated on the precoat layer. However, since the adhesive force between the precoat layer and the precoat layer is strong enough to overcome the internal stress, it does not peel off from the precoat layer, and the precoat layer Since the planar shape of is larger than the planar shape of the three-dimensional first layer to be formed,
There is no fear that the internal stress generated in the cured resin layer laminated on the precoat layer may cause the precoat layer to peel off from the work table.

Therefore, according to the three-dimensional shape forming method of the present invention, a three-dimensional shape can be formed without peeling from the work table in the middle.

The three-dimensional shape forming method shown in the above embodiment is merely one example of the implementation of the three-dimensional shape forming method of the present invention, and does not mean that the technical scope of the present invention is limited thereto. However, various modifications can be made without departing from the object of the present invention, and they are included in the technical scope of the present invention.

Further, the apparatus for carrying out the three-dimensional shape forming method of the present invention is not limited to the illustrated three-dimensional shape forming apparatus.

[Brief description of the drawings]

FIGS. 1 to 3 show an example of a three-dimensional shape forming apparatus for implementing the three-dimensional shape forming method of the present invention.
The figure is an overall perspective view showing a cutaway portion, FIG. 2 is a front view showing a partial cutaway, FIG. 3 is a block circuit diagram of a control unit, and FIG. FIG. 5 is a schematic diagram showing the partial cured resin layers separately, FIG. 5 is a schematic diagram showing a method of forming a precoat layer, FIG. 6 is a schematic diagram showing a modified example of the method of forming a precoat layer, and FIG. FIG. 8 is a schematic cross-sectional view showing an example of a three-dimensional shape forming method, and FIG. 8 is an explanatory view showing problems in the conventional three-dimensional shape forming method. Explanation of code 3 …… Liquid UV curable resin material, 5 …… Work table, 5a …… Top surface of work table, 17 …… Beam, 39 …… UV irradiation lamp, 40 …… Precoat layer, 41 …… Cured resin Layer, 44 ... 3D shape, 47 ... Precoat layer

Claims (1)

(57) [Claims] 1. A first cured resin layer by irradiating a beam onto a liquid ultraviolet curable resin material positioned on the upper surface of a work table with a predetermined thickness to selectively cure the liquid ultraviolet curable resin material. Then, a liquid ultraviolet curable resin material having a predetermined thickness is placed on the first curable resin layer, and beam irradiation is performed to selectively cure the liquid ultraviolet curable resin material on the first curable resin layer. A method for forming a three-dimensional shape by stacking a second cured resin layer on the substrate, and then similarly stacking the cured resin layers on the third, fourth, ... A precoat having a planar shape that is larger than the planar shape of the three-dimensional first layer formed by locating a liquid ultraviolet curable resin material of a desired thickness on the substrate and curing the liquid ultraviolet curable resin material with an ultraviolet irradiation lamp. Layer, and the cured resin on the precoat layer Three-dimensional shape forming method is characterized in that as go laminating