JPH032030A - Forming method of three dimensional shape - Google Patents

Abstract

PURPOSE:To avoid internal stress which causes the peeling between a work- holder and the layer even if beam is applied to the liquid resin of ultraviolet ray curing type positioned on a fully cured precoated layer, by curing the precoated layer with an ultraviolet ray-radiating lamp. CONSTITUTION:The liquid resin of ultraviolet ray curing type with desired thickness is placed on the upper surface of a work-holder 5, and the liquid resin of ultraviolet ray curing type is cured with a ultraviolet ray-radiating lamp 39. Concequently, the precoated layer 40 having the plane shape larger than the plane shape of the first layer of the three dimensional shape to be formed, is formed. Next cured resin layers are successively laminated on the precoated layer 40.

Description

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

A. Industrial field of application B4 Overview of the invention C0 Prior art [Figure 7] D1 Problem to be solved by the invention [Figures 7 and 8] E8 Means for solving the problem F. Examples [Figure 7] Figures 1 to 6] a. Three-dimensional shape forming device [Figures 1 to 3 Co a-1, Storage container [Figures 1 and 2 Co a-2, Work table a-3, Beam scanning section [Fig. 1, Fig. 2] a-4, Control unit [Fig. 1, Fig. 3] b Three-dimensional image forming method [Fig. 1, Fig. 4, Fig. 5 b-1, Formation of precoat layer [Fig. 5] b-2, Formation of three-dimensional shape [Fig. 1, Fig. 4 b-3, Modification of precoat layer forming method [Fig. ) The present invention relates to a novel three-dimensional shape forming method. For more information,
A beam is irradiated to a liquid ultraviolet curable resin material placed at a predetermined thickness on the upper surface of the work table to selectively cure the liquid ultraviolet curable resin material to form a first cured resin layer, and then A liquid ultraviolet curable resin material of a predetermined thickness is placed on the first cured resin layer and selectively cured by beam irradiation, thereby forming a second cured resin material on the first cured resin layer. Regarding the improvement of the method of forming a three-dimensional shape by laminating resin layers and sequentially laminating the third, fourth, etc. cured resin layers in the same manner, in the middle of forming the three-dimensional shape, the cured resin layer The purpose of the present invention is to provide a new method for forming a three-dimensional shape that prevents the material from peeling off from the work table.

(B. Summary of the Invention) The three-dimensional shape forming method of the present invention includes placing a liquid ultraviolet curable resin material of a desired thickness on the upper surface of a work table, curing 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 first layer having a three-dimensional shape to be formed is formed, and cured resin layers are successively laminated on the precoat layer. It is possible to prevent the cured resin layer from peeling off from the work table during the formation of a three-dimensional shape by preventing stress that would cause separation between the resin layer and the work table.

(C, Prior Art) [Figure 7] Beam irradiation is applied to a liquid ultraviolet curable resin material placed at a predetermined thickness on the upper surface of a work table to selectively harden the liquid ultraviolet curable resin material. A first cured resin layer is formed, and then a liquid ultraviolet curable resin material of a predetermined thickness is placed on the first cured resin layer and beam irradiation is performed to selectively cure the first cured resin layer. There is a known method for forming a three-dimensional shape by laminating a second cured resin layer on top of the cured resin layer, and in the same way, sequentially layering a third, fourth, etc. cured resin layer. It is being

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

A is a storage container, and a liquid ultraviolet curable resin material is stored in the storage container a.

Reference numeral C denotes an elevator, which is screwed together with a feed screw e rotated by a motor d, and is moved up and down by the rotation of the feed screw e.

Reference numeral f denotes a work table, which is supported by the elevator C and is adapted to be moved vertically within a liquid ultraviolet curable resin material accommodated in the container a.

Therefore, first, one layer of liquid ultraviolet curable resin material is placed on the work table f, and the beam g is selectively irradiated thereon to selectively harden the liquid ultraviolet curable resin material. 7(A) to form the first cured resin layer h1.
), the work table f is then lowered to position a liquid ultraviolet curable resin material with a predetermined thickness on the previously formed first cured resin layer h1, and the beam g is irradiated onto it. (See FIG. 7(B)), and then cure and adhere to the first cured resin layer h1 to form a second cured resin layer h2 (see FIG. 7(B)). Stack and layer, 1
It forms a three-dimensional shape.

(D. Problems to be Solved by the Invention) [Figures 7 and 8] By the way, in the above-mentioned three-dimensional shape forming method, during the formation of the three-dimensional shape, the cured resin layer hl is exposed to the workpiece table f.
I'm used to it peeling off from the skin.

As schematically shown in FIG. 8, when the beam g is irradiated onto the liquid ultraviolet curable resin material located on the first cured resin layer hl, this beam g is applied to the first cured resin layer hl. layer h
The upper layer i (the part shown with a satin finish in the drawing) is further cured, and the shrinkage of this upper layer i upon curing becomes larger than that of the lower layer j, which causes the first cured resin to harden. layer h
This is because the internal stress generated within the cured resin layer acts in a direction that causes the peripheral portion of the cured resin layer to be peeled off from the work table f.

If the cured resin layer peels off from the work table f, there is a problem in that it becomes impossible to form a three-dimensional shape.

(E. Means for Solving the Problems) In order to solve the above problems, the three-dimensional shape forming method of the present invention positions a liquid ultraviolet curable resin material of a desired thickness on the upper surface of the work table, and The mold resin material is cured with an ultraviolet beating lamp to form a precoat layer having a planar shape larger than the planar shape of the three-dimensional first layer to be formed, and cured resin layers are sequentially laminated on the precoat layer. I decided to go there.

Therefore, in the three-dimensional shape forming method of the present invention, the precoat layer is cured by an ultraviolet irradiation lamp, so that it is sufficiently cured, and the liquid ultraviolet curable resin material placed on the layer is irradiated with a beam. However, since there is no longer any internal stress that would cause peeling between the workpiece and the worktable, sufficient adhesion between the workpiece and the workpiece can be maintained, and the cured resin laminated on the precoat layer Either internal stress occurs in the layer that causes warping, or the adhesive force between this layer and the precoat layer is strong enough to overcome the internal stress, preventing it from peeling off from the precoat layer.
Since the planar shape of the precoat layer is 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 may cause the glycoat layer to be removed from the work table by 7 feet. There is no fear of letting go.

Therefore, according to the method for forming a three-dimensional shape of the present invention, a three-dimensional shape can be formed without causing separation from the work table during the process.

It is necessary to have adhesive properties that allow it to stick. In addition, the liquid ultraviolet curable resin material 3 having such characteristics is as follows:
For example, there are modified acrylates that are cured by ultraviolet light.

(Embodiment F) [The details of the three-dimensional shape forming method of the present invention will be explained in accordance with the illustrated embodiments below in FIGS. 1 to 6.

Before explaining 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) [Figures 1 to 3 (a-1, Storage container) [Figures 1 and 2] 2 is a storage container, inside of which is a liquid ultraviolet curing resin material. 3 is accommodated.

The liquid ultraviolet curable resin material 3 is in a liquid state that hardens by being irradiated with ultraviolet rays, and when it hardens on the surface of an already hardened part, it is placed on the surface (a-2, work table). 4 is an elevator. A horizontal plate-shaped work table 5 is removably provided at its lower end. The work table 5 is made of metal, and its upper surface 5a is a horizontal surface.

A nut 7 is fixed to the upper end 6 of the elevator 4,
The nut 7 is screwed into a feed screw 9 rotated by a stepping motor 8, and as the feed screw 9 rotates, the nut 7 is moved in the axial direction along the feed screw 9,
Thereby, the elevator 4 is moved in the vertical direction.

The work table 5 of the elevator 4 is positioned in the liquid ultraviolet curable resin material 3 contained in the storage container 2, and is moved in steps at a predetermined pitch.

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

11.12 is an 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 direction perpendicular to the first scanning direction (hereinafter referred to as the "second scanning direction"). Drive 14. with shaft 13.13'.
14' and rotating shaft 13. Swinging mirror 1 fixed to 13'
5.15'.

One of these two beam scanners 11 and 12 (hereinafter referred to as the "first beam scanner") 11.
The axial direction of the rotating shaft 13 extends in a direction parallel to the second scanning direction, the swinging mirror 15 is located almost directly above the work table 5 of the elevator 4, and the other beam scanner 12 (hereinafter referred to as the "second beam scanner"), the axial direction of its rotation axis 13' extends in the vertical direction, and the reflecting surface 15'a of its swinging mirror 15' is similar to that of the first beam scanner 11. It is arranged so as to face the reflective surface 15a of the swinging mirror 15 from the side.

16 is a predetermined exposure beam 17, for example, the wavelength is 360n.
A laser beam oscillator 18.19 oscillates an argon ion laser with a wavelength of m (nanometers) or a helium cadmium laser with a wavelength of 325 nm, and a laser beam oscillator 18.19 directs the exposure beam 17 oscillated from the laser beam oscillator 16 in a predetermined direction and sequentially totally reflects it. a total reflection mirror 2 for making the beam incident on the swinging mirror 15' of the second beam scanner 12;
0 is an A10 modulator (acousto-optic modulator) placed between these two total reflection mirrors 18 and 19, and 21 is one total reflection mirror 19 and the second beam scanner 12.
This is a focus controller having a focusing lens 22 disposed between.

The exposure beam 17 oscillated from the laser beam oscillator 16 is reflected by the total reflection mirror 18 toward the A10 modulator 20.
By the switching action depending on the optical deflection state at 0, the propagation to the optical path beyond that is controlled on/off, and A1
When the switching of the 0 modulator 20 is on, the light beam enters the total reflection mirror 19 and is reflected there toward the focusing lens 22. When passing through the focusing lens 22, the light beam is narrowed down, and the light beam is divided into two swinging mirrors 15. ' 15 and is sequentially reflected by the liquid ultraviolet curable resin material 3 from above. The light flux of such exposure beam 17 is condensed by a focusing lens 22, so that the liquid surface 3a of the liquid ultraviolet curable resin material 3 is constantly focused and irradiated with a beam spot 17a having a predetermined diameter. 1 beam scanner 11 times i
11 @ 13 rotates and the swinging mirror 15 swings, the liquid level 3a of the liquid ultraviolet curable resin material 3 is adjusted to the first position.
When the rotating shaft 13' of the second beam scanner 12 rotates and the swinging mirror 15' swings, the liquid surface 3a of the liquid ultraviolet curing resin material 3 is Scanning is performed in the second scanning direction.

(a-4, control section) [Figs. 1 and 3] 23 is a control section.

24 is an elevator position detection sensor arranged parallel to the feed screw 9; 25 is an elevator controller; a signal indicating the position of the elevator 4 detected by the sensor 24 is input; The rotation of the motor 8 is controlled, and thereby the elevator 4
The position of is controlled.

26 is an A10 modulator controller that controls the switching operation of the A/○ modulator 20; 27 is a galvano controller;
Beam scanner 11.12 and focus controller 21
The operation is controlled by instructions from the galvano controller 27.

28 is a circuit of such a control section 23.

29 is a stereoscopic image programming device (not shown), for example,
This is a memory connected to so-called CAD, in which data signals are manually decomposed in the X and Y directions of the decomposition plane, which is formed 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 transmitted to the modulation circuit 30 into a raster, that is, the liquid ultraviolet curing resin material 3 of the exposure beam 17. is converted into a coordinate signal indicating the position of the liquid surface 3a with respect to the scanning area.

A beam position control circuit 31 includes the memory 29 and the modulation circuit 30.

32a and 32b are D/A connected to the modulation circuit 30.
Conversion circuits 33a and 33b are the above D/A conversion circuit 32a
, 32b and separately connected to the first beam scanner 11 and the second beam scanner 12, and of the coordinate signals converted by the modulation circuit 30, in the X direction, that is, the first The signal in the scanning direction is D/A
After being converted into an analog signal in the conversion circuit 32a, it is output to the drive section 14 of the first beam scanner 11 via the gate 33a, and the coordinate signal in the Y direction, that is, the second scanning direction is output to the D/A conversion circuit. After being converted into an analog signal at 32b, the signal is outputted to the drive section 14' of the second beam scanner 12 via the gate 33b, and the respective signals are input to the drive section 14, 14'. During this time, the swinging mirrors 15 and 15' are respectively swung.

34 is a line scanning direction switching circuit, that is, an exposure beam 17
This is a circuit for sequentially switching the line direction of raster scanning of the beam spot 17a between the first scanning direction and the second scanning direction, and the gates 33a and 33b are opened and closed by commands from this line scanning direction switching circuit 34. Each time raster scanning for one resolution plane is completed, the line scanning direction is switched to the first scanning direction or the second scanning direction. That is, when the exposure beam 17 is scanned for a certain resolution plane with the first scanning direction as the line scanning direction, the exposure beam 17 is scanned for the next resolution plane with the second scanning direction as the line scanning direction. Then, for the next decomposition plane, the first scanning direction is set as the line scanning direction. Therefore, the line scanning direction is
When scanning in the scanning direction, the gate 33b is momentarily opened every time scanning of one scanning line in the first scanning direction is completed, and thereby the second beam scanner 12
The swinging mirror 15' is slightly rotated to move the line position of the line scanning of the exposure beam 17 onto an adjacent line in the second scanning direction. Further, when the line scanning direction is the second scanning direction, the gate 33a of the exposure beam 17 is
is momentarily opened every time scanning of one scanning line in the second scanning direction is completed, and this causes the oscillating mirror 15 of the first beam scanner 11 to rotate a little to scan the line scanning line of the exposure beam 17. The position is moved 8 times on the adjacent line in the first scanning direction.

35 is A1 connected to the beam position control circuit 31
0 modulator drive circuit, outputs a control signal to the transducer of the A10 modulator 20 depending on the presence or absence of a signal on one line in the X direction or one line in the Y direction among the planar data, and outputs a control signal to the transducer of the A10 modulator 20 to generate a laser beam oscillator. The optical path of the exposure beam 17 oscillated from the A10 modulator 20 is turned on and off.

36 is a focus control circuit which controls the position of the focusing lens 22 in the focusing direction so that the exposure beam 17 is always focused on a spot of a predetermined diameter on the liquid surface 3a of the liquid ultraviolet curable resin material 3. do.

37 is a motor drive circuit, and the stepping motor 8 is driven by a command from this motor drive circuit 37, and when the three-dimensional shape forming operation is started, the stepping motor 8 is driven to move the elevator 4 onto the upper surface 5a of the work table 5. The upper surface of the pre-coat, which will be described later, is a liquid ultraviolet curing resin material 3.
A position located one layer pitch below the liquid level 3a (hereinafter referred to as
This is called the "initial position." ) is controlled so that it is moved to
Further, after the formation operation is started, the elevator 4 is controlled to move downward by one floor pitch each time the formation for one decomposition plane is completed.

(b. Three-dimensional image forming method) [FIGS. 1, 4, and 5] Formation of a three-dimensional shape using the above-described three-dimensional shape forming apparatus 1 is performed as follows.

Note that the designed three-dimensional shape is a three-dimensional shape 38 shown in FIG.

(b-1, Formation of pre-coat layer) [Fig. 5] First, a pre-coat layer is formed on the upper surface 5a of the work table 5.

The work table 5 is removed from the elevator 4 and taken out from the storage container 2, and the upper surface 5a of the work table 5 is thinly coated with the V-night UV curable resin material 3 (see FIG. 5(A)).

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

Note that this precoat layer 40 does not need to be formed over the entire upper surface 5a of the work table 5, and it is sufficient that it is sufficiently larger than the planar shape of the decomposition plane of the lowest layer when forming the three-dimensional shape 38. be.

Moreover, the thickness of this pre-coat layer 40 is 0.2 to '1. ,
It is preferable to set it on the order of Omm (millimeter), but it is of course not limited to this range.

(b-2 Formation of three-dimensional shape) [Figures 1 and 4] Next, the work table 5 on which the precoat layer 40 is formed on the upper surface 5a is attached to the elevator 4, and then the three-dimensional shape forming operation is started.

Therefore, when the three-dimensional shape forming operation starts, the elevator 4 is first moved to the initial position, and the liquid ultraviolet curable resin material 3 flows onto the upper side of the precoat layer 40 on the upper surface 5a of the work table 5 of the elevator 4, and the liquid ultraviolet curable resin material 3 flows into the first floor. The thickness is equal to the pitch. In addition, the thickness for this one layer pitch is O12~
The range of 2.0m+n is preferable, but of course it is not limited to this.

From this state, the exposure beam 17 performs a rask scan on a region of the liquid surface 3a of the liquid ultraviolet curable resin material 3 corresponding to the precoat layer 40. This rask scanning is performed for each decomposition plane of the three-dimensional shape, starting from one of the two decomposition planes at both ends in the Z direction among the many decomposition planes. Also,
Scanning for one resolution plane is performed with the line scanning direction as either the first scanning direction or the second scanning direction, and when the first scanning direction is the line scanning direction, the first beam scanner 11 Line scanning is performed by swinging the swinging mirror 15 of the second beam scanner 12, and each time one line scan is completed, the swinging mirror 15' of the second beam scanner 12 is rotated by an angle corresponding to one line pitch to perform line scanning. Rask scanning is performed for the one decomposition plane by sequentially moving the line position in the second scanning direction, and when the second scanning direction is the line scanning direction, the second beam scanner 12 Line scanning is performed by swinging the swinging mirror 15',
By rotating the swinging mirror 15 of the first beam scanner 11 by an angle corresponding to one line pitch every time one line scan is completed, the line position of the line scan is sequentially moved in the first scanning direction. Scanning is performed for this one decomposition plane.

In this way, when the raster scanning of the exposure beam 17 on the liquid surface 3a of the liquid ultraviolet curable resin material 3 for one resolution plane is completed, the area of the liquid surface 3a that has been raster scanned by the exposure beam 17 is cured. , thereby making the first
One cured resin layer 41 is formed having the same shape as the decomposition plane to be formed next. In addition, in FIG. 4, broken lines 42.42, . . . or 43.43, . 411 is the first
The scanning direction of the exposure beam 17 is set as the line scanning direction of the exposure beam 17.

First cured resin layer 41. Once formed, the cured resin layer 411 is laminated and bonded onto the precoat layer 40.

Then, one cured resin layer 41. When this is formed, the elevator 4 is moved downward by one layer pitch. As a result, the liquid ultraviolet curable resin material 3 flows onto the already formed cured resin layer 411 to a thickness corresponding to one layer pitch.

From this state, the next order, that is, raster scanning of the exposure beam 17 with respect to the second resolution 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
2 is formed, and the cured resin layer 412 is adhered to the top surface of the first cured resin layer 411 when it cures.

By repeating this operation, a large number of cured resin layers 411412, . . . , 41n are formed.
are stacked on the work table 5, thereby forming a three-dimensional shape 44 having the same three-dimensional shape as the three-dimensional shape 38.

As mentioned above, if the line scanning direction of the cured resin layers 41, 41, . The direction is not constant, and therefore, even if there is a portion 44a that is positioned so as to partially protrude from other portions as in the illustrated three-dimensional shape 44, this portion 44a will not be significantly warped. Furthermore, since the line scanning direction is different for every other cured layer, the start and end points of this line scanning do not appear only on the negative side of the three-dimensional shape 44, and therefore, a three-dimensional image with a smooth surface on all sides is obtained. 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 the lines may be scanned in the same direction for each layer.

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

A storage container 4 separate 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 three-dimensional shape formation is stored in the container 5 .

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

46 is a transparent plate made of, for example, PMMA.

Then, the transparent plate 46 is placed on the liquid ultraviolet curing resin material 3 in the container 45 so as to face the upper surface 5a of the work table 5. As a result, the transparent plate 46 floats in a slightly depressed state in the liquid ultraviolet curable resin material 3, and the liquid ultraviolet curable resin material 3 is positioned in a thin layer between the upper surface 5a of the work table 5 and the transparent plate 46. (See Figure 6(A)).

Next, ultraviolet rays are irradiated through the transparent plate 46 by the ultraviolet irradiation lamp 39 to harden the portion of the liquid ultraviolet curable resin material 3 located in a layer between the transparent plate 46 and the work table 5 (see FIG. 6(B). )reference).

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

Since the upper surface of this pre-coat layer 47 follows the surface of the transparent plate 46 facing the upper surface 5a of the work table 5,
By improving the flatness of the transparent plate 46, it is possible to form a thin precoat layer 47 with good flatness.

All that is left to do is to attach the work table 5 with the precoat layer 47 formed on the upper surface 5a to the elevator 4, and form a three-dimensional shape on the precoat layer 47 in the same manner as described above.

(G. Effect of the invention) As is clear from the above description, the method for forming a three-dimensional shape of the present invention involves beam irradiation to a liquid ultraviolet curable resin material placed at a predetermined thickness on the upper surface of a work table. selectively curing the liquid ultraviolet curable resin material to form a first cured resin layer, and then positioning a liquid ultraviolet curable resin material of a predetermined thickness on the first cured resin layer. A second cured resin layer is laminated on the first cured resin layer by beam irradiation and selective curing.
, fourth, etc., to form a three-dimensional shape by sequentially laminating cured resin layers, in which a liquid ultraviolet curable resin material of a desired thickness is placed on the upper surface of a work table, and the liquid ultraviolet curable resin material is The ultraviolet curable resin material is cured using an ultraviolet irradiation lamp,
The present invention is characterized in that a precoat layer having a planar shape larger than the planar shape of the three-dimensional first layer to be formed is formed, and the cured resin layer is laminated on the precoat layer.

Therefore, in the three-dimensional shape forming method of the present invention, the precoat layer is cured by an ultraviolet irradiation lamp, so that it is sufficiently cured, and the liquid ultraviolet curable resin material placed on the layer is irradiated with a beam. However, since there is no longer any internal stress that would cause peeling between the workpiece and the workpiece, sufficient adhesion between the workpiece and the workpiece can be maintained, and the cured resin layer laminated on the precoat layer. Although internal stress that causes warping occurs, the adhesive force between this and the precoat layer is strong enough to overcome the internal stress.
This does not peel off from the precoat layer, and since the planar shape of the precoat layer is larger than the planar shape of the three-dimensional first layer, the cured resin is laminated on the precoat layer. There is no risk that internal stress generated in the layer will cause the precoat layer to peel off from the work table.

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

It should be noted that the three-dimensional shape forming method shown in the above example is only one example of implementing 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 purpose of the present invention, and these are included within the technical scope of the present invention.

Further, the apparatus for implementing the three-dimensional shape forming method of the present invention is not limited to the three-dimensional shape forming apparatus shown in the drawings.

[Brief explanation of the drawing]

FIGS. 1 to 3 show an example of a three-dimensional shape forming apparatus for carrying out the three-dimensional shape forming method of the present invention.
The figure is a perspective view of the whole with a part cut away, Figure 2 is a front view with a part cut away, Figure 3 is a block circuit diagram of the control section, and Figure 4 shows the formed three-dimensional shape. A conceptual diagram showing each partially cured resin layer separately; FIG. 5 is a schematic diagram showing a method for forming a precoat layer; FIG. 6 is a schematic diagram showing a modification of the method for forming a precoat layer; FIG. FIG. 8 is a schematic cross-sectional view showing an example of a three-dimensional shape forming method, and is an explanatory diagram showing problems in the conventional three-dimensional shape forming method. Explanation of symbols 3... Liquid ultraviolet curing resin material, 5... Work table, 5a... Upper surface of work table, 17... Beam, 39... Ultraviolet irradiation lamp, 40... Precoat layer , 41... Cured resin layer, 44... Three-dimensional shape, 47... Precoat layer Applicant: Sony Corporation Representative Patent Attorney Yu Komatsu Figure 4 Workbench Top surface of workbench UV # Terujuku dimensions Rumph. Positive drawing showing the aliquot layer formation method; Figure 5;

Claims (1)

[Claims] A liquid ultraviolet curable resin material placed at a predetermined thickness on the upper surface of a work table is irradiated with a beam to selectively cure the liquid ultraviolet curable resin material to form a first cured resin. Next, a liquid ultraviolet curable resin material of a predetermined thickness is placed on the first cured resin layer and selectively cured by beam irradiation to form a first cured resin layer. A method for forming a three-dimensional shape by laminating a second cured resin layer on top of the workpiece, and in the same manner, sequentially laminating a third, fourth, etc. A liquid ultraviolet curable resin material with a desired thickness is placed on the upper surface, and the liquid ultraviolet curable resin material is cured with an ultraviolet irradiation lamp to form a planar shape larger than the planar shape of the three-dimensional first layer. A method for forming a three-dimensional shape, comprising forming a precoat layer having the above-mentioned properties, and laminating the cured resin layer on the precoat layer.