JPH04113828A - Manufacture of large-sized stereo-resin model and device therefor - Google Patents

Abstract

PURPOSE:To make it possible to speedily manufacture the title stereo-resin model with high accuracy and low deformation by sharing the scanning for respective division regions of the surface of a light hardening resin or for in dependent slice sectional portions of a stereo-model with each laser beam of each scanner. CONSTITUTION:A three-dimensional CAD is formed with a contour-like sectional data of the sliced layers of thin sectional bodies of designed model. It is prepared on a computer of a controller 15. Next, a work table 12 is held near the surface of a resin liquid 11 to be slightly covered therewith. A laser supply 1 emits four laser beams 8 to scan the surface of the resin liquid 11 through light shutter 4 and light scanner 7, thereby hardening the resin liquid 11. In this case, the laser beams 8 are shared into respective division regions A, B, C and D for sharing the scanning in respective regions. The parallel scans for respective division regions increase the light hardening speed. Further, by oscillating the laser beam in the range of allowable emitting angle, it is possible to harden the sectional portion of the resin with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and apparatus for manufacturing a large three-dimensional resin model by laser light curing.

[Prior Art] FIG. 9 shows a conventional method for manufacturing a large three-dimensional resin model using laser light curing.

First, as shown in (a), a model a designed on a three-dimensional CAD is sliced into many thin cross-sectional layers to create contour cross-sectional data and prepared on the computer of the control device.

Next, as shown in (b), first, in a liquid tank C filled with a photocurable resin liquid that hardens when exposed to a laser beam,
A work table d movable in two directions (up and down) is stopped near the liquid surface e so that the resin liquid is thinly covered, and an ultraviolet laser beam f is applied to the liquid surface e using the galvano mirror shown in the figure.
g or an optical scanner h consisting of an XY plotter (not shown)
irradiation while scanning in the X-Y direction. That is, by controlling the optical scanner h based on the contour cross-sectional data, the liquid surface is scanned with a laser beam along the slice cross-sectional shape of the first layer of the three-dimensional model a. The resin liquid exposed to the light hardens, and the cross-sectional shape of the slice of the first layer is fixed to the work table d.

Next, when the work table d is lowered a little, the resin liquid flows around and forms a thin liquid resin layer.

This is also irradiated with a laser beam f and scanned to harden the sliced cross-sectional shape of the second layer.

By repeating this operation, thin layers are gradually laminated as shown in (c) and (d), and the laminated work part i of the three-dimensional model,
When the desired laminated work part j is completed, as shown in (e), the work table d is pulled out of the resin bath to obtain the completed laminated work (three-dimensional resin model) k.

This light-speed method of creating a three-dimensional resin model using lamination processing allows a three-dimensional resin model to be created directly from CAD data within a certain accuracy range without requiring special techniques such as mold processing. Therefore, it is possible to prototype multiple three-dimensional resin models, confirm the optimal shape, and then create molds for mass production.This technology is becoming established as an important technology, and is currently being used to speed up prototyping. High precision.

There is interest in increasing the size and reducing costs.

[Problems to be Solved by the Invention] However, the conventional manufacturing method
In the case of any type of Y-plotter optical scanner, there is only one laser beam f that manipulates the liquid surface, so when the three-dimensional model to be manufactured becomes large, it takes too much time to manufacture it and the dimensional accuracy becomes poor. There was a problem with it being low.

From the viewpoint of speeding up, the conventional method has been to increase the laser power to improve the photocuring speed, thereby increasing the scanning speed. However, as the laser power increases, it becomes difficult to maintain an optimal cured state simply by increasing the scanning speed, although it also depends on the characteristics of the photocurable resin used. In other words, excessive light may cause the polymerization reaction to run out of control, leading to excessive curing.

Next, in terms of dimensional accuracy, when scanning the outline of the sliced cross-sectional shape of a large three-dimensional resin model with a galvanometer mirror g, for example, as shown in FIG. When the laser beam f is not scanned to
causes a focus shift, so conventional focus correction lenses m
This focus shift is corrected by moving the position of the lens along the optical axis. However, in the case of large three-dimensional resin models, it was found that the dimensional accuracy was still low even with this correction alone, and the distortion caused by photocuring was particularly large.

An object of the present invention is to provide a manufacturing method and apparatus that can eliminate the above-mentioned conventional drawbacks and manufacture large-sized three-dimensional resin models at high speed, with high precision, and with low distortion by using two or more laser beams. It is about providing.

[Means for Solving the Problems] The method for manufacturing a large three-dimensional resin model according to the present invention has the following three forms.

First, at least two optical scanners are placed above the liquid surface of the photocurable resin liquid, spaced apart in the liquid surface direction, and each of the laser beams scanned by each optical scanner is divided across the entire liquid surface. The laser beam of each optical scanner is assigned to each divided area, and the scanning of the sliced cross-sectional portion of the three-dimensional model that exists across or independently of each divided area is shared by the laser beam of each optical scanner.

Second, at least two optical scanners are placed above the liquid surface of the photocuring resin liquid, spaced apart in the liquid surface direction, and the laser beams scanned by each optical scanner are directed to different locations on the liquid surface. The laser beams of each optical scanner share a plurality of independent scanning lines of slice cross-sectional shapes in the same slice layer of the three-dimensional model with each laser beam.

Thirdly, at least two optical scanners are placed above the liquid surface of the photocuring resin liquid, spaced apart in the liquid surface direction, and the laser beams scanned by each optical scanner are directed to different locations on the liquid surface. 1 along the slice cross-sectional shape of the 3D model.
The optical scanning line is divided into small sections, and the scanning of each small section is shared by the laser beams of the respective optical scanners.

Furthermore, there are two forms of the manufacturing apparatus of the present invention as follows.

The first is a large liquid tank filled with a photocurable resin liquid, a two-way moving device that raises and lowers a work table placed in the liquid in this liquid tank, and a work table placed above the liquid tank that is spaced apart in the direction of the liquid level. A plurality of mirrors are arranged, each of which swings a laser beam from a laser light source in the X-Y direction along the liquid surface, and holds cross-sectional data obtained by slicing a three-dimensional design model into many thin cross-sectional bodies, and stores the cross-sectional data. and a control device that controls the plurality of mirrors according to the above and controls the two-direction moving device when switching each layer.

The second is a large liquid tank filled with a photocuring resin liquid, a Z-direction moving device that moves up and down a work table placed in the liquid in this liquid tank, and a Z-direction moving device that is spaced above the liquid tank in the direction of the liquid level. A plurality of projectors are arranged and each irradiates the liquid surface with a laser beam from a laser light source, an X-Y direction moving device moves the projector along the liquid surface, and a three-dimensional design model is made up of several layers of thin cross-sections. and a control device that holds cross-sectional data sliced into sectional data, and controls the X-Y direction moving device of the plurality of projectors according to the cross-sectional data, and the control device of the Z-direction moving device when switching each layer. be.

[Function] Using Fig. 7 and Fig. 8, the dimensional accuracy and distortion of the large three-dimensional resin model in the case of one laser beam,
I will explain what I considered.

As shown in FIG. 7, when the laser beam f is scanned from the center A part of the resin liquid level e to the outer region B part, the galvano mirror
As shown in FIG. 8(a), in the part A at the center of the resin liquid level directly below the swinging center point C of g, the photocuring part is Qn, Qn-1・
The axes of ... were aligned perpendicular to the liquid surface, and the dimensional accuracy and distortion of this portion A were good. However, Fig. 8(b)
As shown in , in part B of the outer region far away from the center A of the resin liquid level e, the photocured part Qn of the model laminated work part i is
.

Qn-1... is the axis Sn of each layer n, n-1....

5n-1... were aligned in the vertical direction in a state of inclination with respect to the vertical line R of the liquid level, and in this B portion, the dimensional accuracy was significantly reduced and the distortion was large.

In this way, the photocured portion Q of each layer of the model laminated workpiece i
The phenomenon in which n, Qn-1, etc. are connected in a dango-like manner occurs because, in the case of a large surface #resin model, the liquid surface area to be scanned is large, whereas in the case of a receiver, there is only one laser beam f that covers this area. This is due to the fact that That is, when the laser beam f is scanned from the center A part of the resin liquid surface to the outer area B part, the swing angle of the galvanometer mirror g, that is, the laser beam f
It is assumed that this is because the deflection angle θ also increases.

The present invention is based on such recognition, and in the case where each optical scanner is a galvano-mirror type, in the first embodiment of the above manufacturing method, each of the laser beams oscillated by each galvano-mirror can be scanned. The range is limited to partial areas that are smaller than the entire liquid surface and that are continuous with each other. That is, one laser beam is assigned to each of the divided regions obtained by dividing the entire liquid surface. Therefore, if the slice cross-sectional shape of the three-dimensional model exists across each divided region, each galvano mirror
All you have to do is scan only the slice cross-sectional shape that exists in the divided area you are responsible for. As a result, the swing angle of each galvano mirror, that is, the deflection angle θ relative to the liquid surface, is smaller than when swinging relative to the entire liquid surface. has also become smaller, and the optical scanner is now 1
Compared to the case where the resin is cured, distortion does not occur in the cured resin part.

In addition, regardless of whether each optical scanner is a galvanometer mirror type or an XY plotter type, two or more laser beams can simultaneously scan the light in parallel, so three-dimensional resin models can be created at high speed in a significantly shorter time than when using one laser beam. can be manufactured. Note that when the slice cross-sectional shape part does not exist in the divided region that it is in charge of, the optical scanner stops the light irradiation itself.

2 of the above manufacturing method. The third form removes the restriction that the entire liquid surface is divided into a plurality of divided regions and the laser beam is swung only within the divided regions as described above. In the second method, when there are a plurality of independent scanning lines in the slice cross-sectional shape in the same slice layer of the three-dimensional model, each scanning line is connected to each galvano mirror.
Due to the characteristics of the slice cross-sectional shape of the three-dimensional model, the scanning lines that are shared by the laser beams of The deflection angle θ of the laser beam is also smaller than that when the laser beam is deflected over the entire liquid surface.

In the third form, when there is one scanning line along the slice cross-sectional shape of the three-dimensional model, the scanning line is divided into small sections (line segments), and each small section is scanned by the laser of each of the above optical scanners. It is shared by the rays of light. Since only each small section of the entire continuous scanning line is scanned,
The deflection angle θ of the laser beam by each galvanometer mirror is also smaller than that when the laser beam is deflected over the entire liquid surface.

[Example] The present invention will be explained below using specific examples.

FIG. 1 shows a high-speed manufacturing apparatus for large-sized three-dimensional resin models using a galvano-mirror type optical scanner.

Reference numeral 10 denotes a liquid tank in which a large three-dimensional resin model can be manufactured, and is filled with a photocurable resin liquid 11 that hardens when exposed to a laser beam. A work table 12 is contained in this photocuring resin liquid 11.
is arranged and supported so as to be movable up and down by a Z-direction moving device 3f13.

Above the photocuring resin liquid level 14 of this liquid tank 10, there are a plurality of galvano-mirror one-type optical scanners 7, four in this case,
They are arranged apart from each other in the liquid surface direction (XY direction). That is, although FIG. 1 only shows two optical scanners 7 spaced apart in the X direction, there are also two more optical scanners 7 in the Y direction perpendicular to the page of FIG. 1 (see FIG. 2). Incidentally, each optical scanner 7 is composed of a galvanometer mirror 6 having a pair of electromagnetic mirrors for the X direction and the Y direction.

1 is a laser light source, and the laser light 2 emitted from this laser light source 1 is branched into four systems by an optical splitter 3.
The first system of laser light is guided through the optical shutter 4 and two reflection mirrors 5.5 to the optical scanner 7 that is farther from the laser light s1, and becomes a first laser beam 8 that irradiates the liquid surface 14. .

Further, the second system of laser light is guided through another reflection mirror 5° optical shutter 4 to an optical scanner 7 closer to the laser light source 1, and irradiates the liquid surface 14 as a second laser beam 8. The remaining two systems of laser light are guided to the optical scanner 7 in the same manner.

Reference numeral 15 denotes a control device mainly composed of a computer, which controls the output of each laser beam 8 by the optical splitter 3, opens and closes the optical shutter 4, and controls the optical scanner 7 for the above four systems.
The control unit controls the swinging of the galvanometer mirror 6, the operation of the focus correction lens, and the elevation and descent of the Z-direction moving device 13.

As shown in FIG. 2, the 4@ optical scanners 7 scan the scanning surface 16 consisting of the entire liquid surface 14 into areas corresponding to the number of optical scanners, that is, four areas A.

It is virtually divided into B, C, and D, and each divided area A,
It is located within B, C, and D, for example, approximately in the center. In this case, as shown in FIG. 2, the scanning surface 16 is equally placed on the side, or as shown in FIG.
It is arbitrary to divide the area into C and D, and the position of the optical scanner 7 in each divided area is also arbitrary.

It is not necessary to place it approximately in the center of B, C, and D, but
At least each optical scanner 7 irradiates light to the farthest end of the divided area that the optical scanner has,
The deflection angle θ at that time needs to be within a limit angle that does not cause distortion to the completed three-dimensional resin model. From the viewpoint of the irradiation angle of the laser beam with respect to the liquid surface 14,
The divided areas of the scanning plane 16 and the position of the optical scanner 7 are determined, and the number of divisions of the scanning plane 16 is also determined to be an economical value.

In this way, the scanning surface 16 consisting of the entire liquid surface is virtually divided into four divided areas A, B, C, and D, and the laser beam 8 scanned by each optical scanner 7 is divided into each divided area. Allocated for each area.

Next, the manufacturing method will be explained.

(a) First, as in the past, a model designed on a three-dimensional CAD is sliced into many thin cross-sectional layers to create contour cross-sectional data and prepared on the computer of the control device 15.

(b) The work table 12 is stopped near the liquid surface so that the resin liquid 11 covers it thinly, and the optical shutter 4. Four laser beams 8 obtained through an optical scanner 7 are scanned, and the resin liquid hit by the light is cured. At that time, each laser beam 8
, D is responsible for scanning only within the assigned divided area.

For example, as shown in FIG. 2, the slice cross-sectional shape of the three-dimensional model, that is, the scanning line 17, is
When the laser beams 8 exist across C and D, each laser beam 8 has a slice cross-sectional shape portion 17a that exists only within the area that it receives.

Only 17b, 17c, and 17d are scanned along their contours. In FIG. 2, a white circle indicates a scanning start point, and a black circle indicates a scanning end point.

If the slice cross-sectional shape part existing in the divided area that the self owns is an independent slice cross-sectional shape part that is not continuous with those of other divided areas, for example, an independent circular curve, The independent scanning line is drawn using only the laser beam 7, and when there is no slice cross-sectional shape part within the area that the optical branching device 3 has, the light irradiation itself is not performed. controls the output of the laser beam branched by the receiver, and distributes the output of the laser beam to the area held by the other receivers to perform high-speed modeling.

The start and end of the irradiation of the laser beam 8 is performed by controlling the opening and closing of the optical shutter 4 by the control device 15, and the scanning of the laser beam 8 along the slice cross-sectional shape is performed based on the contour line-shaped cross-sectional data. Based on optical scanner 7
This is done by controlling the swinging of the galvano mirror 6 and controlling the focusing operation of the focus correction lens.

(C) After the first layer is cured, lower the work table 12 slightly, wait for the resin liquid to wrap around the falling layer, and perform optical scanning in the same manner as the first layer using the cross-sectional data of the second layer. , harden the resin.

(d) Repeat the same operation for the third and subsequent layers, and perform lamination processing by optical scanning to form the laminated work part 18 of the three-dimensional model (
Figure 1) is formed.

As is already clear, the difference between the above manufacturing method and the conventional method lies in the division of the scanning surface 16 and the scanning method of the laser beam 8. This means that the cross-sectional shape is cured with high precision by multiplying the curing speed and swinging the laser beam within the estimated irradiation angle range.

FIG. 3 shows a somewhat complicated example in which the model has a structure in which the cross-sectional shape of the slice is double and has reinforcing bars.

For each divided area A, B, C, D,
Each laser beam indicated by the numbers 1, 2, 3, and 4 first scans from the white circle mark position (scanning start point) on the outer contour line 19 to the square mark position l (scanning end point), and then Scan from the white circle mark to the square mark on the inner contour line 20, and finally,
The parts of the reinforcing bars 21 and 22 in the divided areas C and D are scanned from white circles to squares. Here, too, since optical scanning is performed for each divided area and in parallel in time, advanced scanning can be achieved in a much shorter time than when a single laser beam is used.

Next, an example of another manufacturing method of the present invention will be described.

For example, when it is desired to manufacture a character 1-shaped three-dimensional model 23 as shown in FIG. Since there is nothing to support it, it cannot be manufactured using normal lamination processing. Therefore, in general, the support 24 is formed from the beginning as shown in FIG. 4(b), and the support 24 is cut off at a predetermined position 25 after the three-dimensional model is completed.Therefore, it is not possible to directly use CAD data here. If this is not possible, the computer of the control device 15 will request the cross-sectional data of this support 24 portion.

In the case where the support 24 is of the speed-of-light type, the scanning surface 16 can be divided into divided areas A, B, C, and D as described above, and the processing can be shared among them, but the cross-sectional shape of the support 24 itself is not so large; A special type that has an independent cross-sectional shape! E! It shows the appearance.

Therefore, in the second manufacturing method of the present invention, at least two optical scanners 7 are arranged above the liquid surface and spaced apart in the liquid surface direction, and each of the laser beams 8 scanned by each optical scanner 7 is directed to the liquid surface. This is the same as above in that irradiation is applied to different locations, but the concept of dividing the scanning surface 16 into divided areas A, B, C, and D is discarded. And each laser beam 8
Accordingly, a plurality of independent scanning lines of the slice cross-sectional shape in the same slice layer of the three-dimensional model, that is, in the example of FIG. The laser beam of the optical scanner 7 is used.

By doing this, the curing speed of each layer can be improved, and CAD
Software for converting data into scan data can be simplified.

The third manufacturing method of the present invention also abandons the concept of dividing the scanning surface 16 into divided areas A, B, C, and D as described in FIGS. 2 and 3, and each laser beam is divided area A,
This removes the restriction that it must be in B, C, and D.

For example, as shown in FIG. 5, a continuous scanning line 26 having a slice cross-sectional shape spanning the entire scanning surface 16 is divided into small sections 26a, 26b, 26c, and 26d, and each optical scanner scans each small section. The laser beam 8 of The scanning line 26 itself is divided into subdivisions 26a depending on the number of laser beams 8.

Since the laser beam 8 is divided into 26b, 26c, and 26d, the scanning start point (white circle) and scanning end point (black circle) of each laser beam 8 correspond to the aforementioned divided areas A, B, and C.

In terms of D, it is allowed to enter from one divided region into another divided region. That is, the start and end points of scanning can be appropriately determined depending on the three-dimensional model, and flexible optical scanning is possible.

Although the above embodiment has been described assuming that the optical scanner 7 is of a galvano-mirror type, the method of the present invention can be similarly applied even if the optical scanner 7 is of a plotter type.

FIG. 6 shows an example of a manufacturing apparatus using an XY plotter type optical scanner.

As in the case of Fig. 1, there are four
These are XY plotter type optical scanners, and each has a projector 27.
and its X-Y direction moving device 28.

Laser light 2 from laser light source 1 is branched into four systems by optical splitter 3, and after passing through each optical shutter 4, it is connected to optical fiber 2.
9 to the projector 27 individually. The four laser beams 8 emitted from these projectors 27 irradiate the surface of the photocurable resin liquid 11 that thinly covers the work table 12. These four laser beams 8 are scanned along the sliced cross-sectional shape of the three-dimensional model by the control device 15 controlling the X-Y direction moving device 28 of the projector 7 based on contour cross-sectional data of CAD. .

Also when using this plotter type optical scanner, the cross-sectional shape of each layer can be cured faster and with higher precision than with the conventional similar type.

Since the light irradiation angle of a plotter-type optical scanner is perpendicular to the liquid surface, there is no problem of distortion that occurs in the case of a single-galvano-mirror type, and the optical scanner 7 can have multiple projectors. Accordingly, the first
．． Second. This is because parallel processing can be performed using a plurality of laser beams at the same time according to the third manufacturing method.

[Effects of the Invention] As described above, the present invention exhibits the following excellent effects.

(1) Regardless of whether each optical scanner is a galvanometer mirror type or an XY plotter type, two or more laser beams can scan in parallel at the same time, so three-dimensional resin models can be created in a significantly shorter time than when using one. Can be manufactured at high speed.

(2) If each optical scanner is a single galvanometer type, the first
In this manufacturing method, the entire liquid surface is divided and the scannable range of the laser beam is limited to the divided areas, so the deflection angle θ of the laser beam by each galvano mirror is smaller than that when the laser beam is deflected relative to the entire liquid surface. Become. Also, the second. In the third manufacturing method, the restriction that the laser beam is swung only within the divided regions is removed, and each scan of a plurality of independent scanning lines in the same slice layer of the three-dimensional model or a slice of the three-dimensional model is The scanning of a small section (line segment) of one continuous scanning line along the cross-sectional shape is shared by the laser beam of each galvano mirror, and the deflection angle θ of the laser beam of each galvano mirror is equal to the entire liquid surface. It will be smaller than when swinging against the opponent.

Therefore, distortion of the cured resin portion is less likely to occur compared to when there is only one optical scanner.

(3) As a result of [1] and (2) above, the cross-sectional shape of a large three-dimensional resin model can be cured at high speed and with high precision.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of a manufacturing apparatus for a large three-dimensional resin model of the present invention, FIGS. 2 and 3 are explanatory diagrams of a scanning method in the form of the first manufacturing method of the present invention, and FIG. is a cross-sectional view of a three-dimensional model for explaining the scanning method in the form of the second manufacturing method of the present invention, FIG. 5 is an explanatory diagram of the scanning method in the form of the third manufacturing method of the present invention, and FIG. A schematic diagram showing another configuration example of the manufacturing apparatus for a large three-dimensional resin model according to the invention. FIG. 7 is an explanatory diagram of the deflection angle and focus shift when there is only one laser beam, and FIG. 8 is an illustration of the deflection angle and focus shift when the deflection angle is large. FIG. 9 is a diagram illustrating a conventional manufacturing method of a three-dimensional resin model, which is an explanatory diagram of a decrease in accuracy and an increase in distortion of a laminated workpiece. In the figure, 1 is a laser light source, 3 is an optical splitter, 4 is an optical shutter, 6 is a mirror, 7 is an optical scanner (including a focusing lens), 8 is a laser beam, 10 is a liquid tank, and 11 is a photocuring device. Resin liquid, 12 is a work table, 13 is a Z direction moving device, 14
is the liquid level, and 15 is the control wave! , 16 is the scanning plane, 17.19~
Reference numerals 22 and 26 indicate a scanning line, 18 a laminated workpiece, 27 a projector, 28 an X-Y direction moving device, and 29 an optical fiber. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative patent attorney: Nobuo Kinutani (1 other person) 26a-26d
'/l-1,4 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] 1. At least two optical scanners are arranged above the liquid surface of the photocuring resin liquid, spaced apart in the liquid surface direction, and each of the laser beams scanned by each optical scanner is directed to the liquid surface. A large 3D object that is assigned to each divided region of the whole, and in which the laser beam of each optical scanner is used to scan the slice cross-sectional portion of the 3D model that exists across or independently of each divided region. How to make resin models. 2. At least two optical scanners are arranged above the liquid surface of the photocurable resin liquid, spaced apart in the liquid surface direction, and each laser beam scanned by each optical scanner is irradiated to a different location on the liquid surface. A method for manufacturing a large three-dimensional resin model, characterized in that a plurality of independent scanning lines of slice cross-sectional shapes in the same slice layer of the three-dimensional model are shared by the laser beams of each of the optical scanners. 3. At least two optical scanners are arranged above the liquid surface of the photocurable resin liquid, spaced apart in the liquid surface direction, and each laser beam scanned by each optical scanner is irradiated to a different location on the liquid surface. A method for producing a large three-dimensional resin model, characterized in that a continuous scanning line along the slice cross-sectional shape of the three-dimensional model is divided into small sections, and the scanning of each small section is shared by the laser beam of each of the optical scanners. 4. A large liquid tank filled with a photocuring resin liquid, a Z-direction moving device for raising and lowering a work table placed in the liquid in this liquid tank, and a plurality of devices spaced apart in the liquid surface direction above the liquid tank. Mirrors are arranged to wave the laser beam from each laser light source in the X-Y direction along the liquid surface, and hold cross-sectional data obtained by slicing a three-dimensional design model into many thin cross-sectional bodies, and store the above-described cross-sectional data according to the cross-sectional data. A manufacturing apparatus for a large three-dimensional resin model, comprising a control device that controls a plurality of mirrors and controls the Z-direction moving device when switching between layers. 5. A large liquid tank filled with a photocuring resin liquid, a Z-direction moving device for raising and lowering a work table placed in the liquid in this liquid tank, and a plurality of devices spaced apart in the liquid surface direction above the liquid tank. A projector that irradiates the liquid surface with a laser beam from a laser light source, an X-Y direction moving device that moves the projector along the liquid surface, and a three-dimensional design model that is sliced into many thin cross-sectional layers. X- of the plurality of projectors according to the cross-sectional data
A manufacturing apparatus for a large three-dimensional resin model, comprising a control device that controls a Y-direction moving device and a control device that controls the Z-direction moving device when switching between layers.