JP2000033652A - Stereo lithography method, photo-setting resin and stereo lithography apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the coating irregularity and coating omission caused by repelling by providing a magnetic field applying means applying a magnetic field to a surface after coated with an uncured resin so as to apply a magnetic field to the coated surface of the uncured resin prepared by mixing a magnetic powder with a photosetting resin to erect the magnetic powder on the uncured resin coated surface to expose and cure the coated surface. SOLUTION: When an uncured resin applied by using a photosetting resin mixed with a magnetic powder 20 is scraped off, the magnetic powder 20 in the photosetting resin is attracted to the surface of the photosetting resin on the side of a magnetic field applying means 21 by the magnetic force from the magnetic field applying means 21 provided to a squeegee 3 at the time of movement of the squeegee 3 and fine unevenness is formed on the surface of the photosetting resin by the magnetic powder 20. Therefore, the cured surface also becomes the uneven surface by the magnetic powder 20. When an uncured resin is applied to the cured surface of the photosetting resin becoming unevenness by the magnetic powder 20, the coating omission 22 of the coated resin at a time when the uncured excessive resin 19 at the movement of the squeegee 3 is scraped off by the unevenness of the magnetic powder 20 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical molding apparatus for producing a three-dimensional resin model by curing and laminating a photocurable resin by irradiating a laser beam. The present invention relates to an optical shaping method, a photocurable resin, and an optical shaping apparatus for performing the method.

[0002]

2. Description of the Related Art An optical molding technique is known as a technique for creating a shape model from three-dimensional CAD data in a short time. As disclosed in Japanese Patent Publication No. 5-33901, CA
According to the contour data converted by cutting the shape data of D into circles, the photocurable resin is irradiated with an ultraviolet laser,
The molding is performed by repeating the curing and laminating one layer.

[0003]

In stereolithography, contour data representing a shape is used, and a photo-curing resin is applied at a predetermined light pitch so as to correspond to the contour of each layer.
A model is created by repeatedly curing and laminating. In order to laminate at a predetermined pitch, it is necessary to apply an uncured resin to the cured layer at a constant thickness every time the layer is further cured. For this reason, the uncured resin is once thickly applied and the excess is scraped off with a squeegee. However, the cured surface of the photo-cured resin, which is the application surface, has the property of repelling uncured resin. There is a problem that coating unevenness and coating defects occur.

[0004]

The object of the present invention is to mix a magnetic powder with a photocurable resin, apply an uncured resin, and then apply a magnetic field to the coated surface to allow the magnetic powder to stand on the coated surface of the uncured resin. This is achieved by providing means for applying a magnetic field to the coated surface after the application of the uncured resin so that the resin is exposed to light and cured.

[0005]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of the configuration of an optical shaping apparatus according to one embodiment of the present invention. The photocurable resin 1 is injected into a photocurable resin tank 2. The magnetic powder 20 is mixed in the photocurable resin 1. The squeegee 3 is placed on a slide rail 4 provided in parallel with the liquid surface of the photocurable resin 1, and is moved by the squeegee driving means 5 on the slide rail in contact with the liquid surface of the photocurable resin 1. ing. The squeegee 3 is provided with a magnetic field applying means 21.

The photo-curing resin applying means comprises means 6 for sucking the uncured photo-curing resin from the tank 2, a hose 7, a small tank 8 for temporarily storing the sucked resin, and a heating means 9 for heating the temporarily stored resin. Further, the small tank 8 has a nozzle 10 for discharging the heated resin. Nozzle 1
The small tank 8 having 0 is placed on the slide rail 4 and moves prior to the movement of the squeegee 3 and discharges the uncured light-cured resin heated and heated from the nozzle 10 while applying it. Moving. The nozzle 10 may be moved separately from the squeegee 3, but it is preferable that the nozzle 10 is operated close to the squeegee 3 so that the temperature of the discharged and applied resin does not decrease.

The work table for stereolithography 11 is controlled by the work table Z-axis moving means 12 to move in the Z-axis (depth) direction in the photo-curable resin tank 2 while keeping the liquid surface of the photo-curable resin 1 parallel. You. The optical laser light 13 is the laser oscillator 1
4, and irradiates the liquid surface (application surface) of the photocurable resin 1 via a galvanomirror (X axis, Y axis) 15. The galvanomirror 15 is controlled by a galvanomirror control circuit 16 so that the laser beam 13 can scan the liquid surface of the photocurable resin 1.

The squeegee driving means 5, the galvanometer mirror control circuit 16, and the work table moving means 12 are controlled by an optical shaping system control circuit 17. The stereolithography system control circuit 17 operates the galvanomirrors 15 of the X and Y axes via the galvanomirror control circuit 16 in accordance with the contour drawing data 18, and the laser beam 13 scans the liquid surface of the photocurable resin 1. The portion of the photocurable resin 1 irradiated with the laser beam 13 is immediately cured.

When the scanning for one layer is completed, the optical shaping system control circuit 17 reads the contour drawing data 18 'of the next layer, and further moves the work table 11 via the work table Z-axis moving means 12 by the stacking pitch P. Submerge deeply from the liquid surface of the photocurable resin 1. A new layer of uncured photocurable resin is applied on the already cured layer. By moving the squeegee 3, the surplus resin 19 applied thicker than the prescribed liquid level 23 is removed. FIG. 2 shows that after the n-th layer is cured, the work table 11 is sunk by P, and
The state where the squeegee 3 is moved while the uncured resin layer is applied and the magnetic field applying means 21 applies the uncured resin layer to scrape off the excess resin 19 is shown.

FIG. 3 shows a state in which the excess resin 19 is scraped while the squeegee 3 is moved.

FIG. 4 is a view showing a state in which the applied uncured surplus resin 19 is scraped off when a photocurable resin into which the magnetic powder 20 is not mixed is used. Although the squeegee 3 scrapes off the applied uncured surplus resin 19, the applied resin is repelled when the squeegee 3 moves due to the repelling property of the cured surface, resulting in coating defects 22.

FIG. 5 is a diagram showing a state in which the applied uncured resin is scraped off when the photocurable resin mixed with the magnetic powder 20 is used. When the squeegee 3 moves, the magnetic powder 20 in the photocurable resin is attracted to the photocurable resin surface side where the magnetic field applying means 21 is provided by the magnetic force from the magnetic field applying means 21 provided on the squeegee 3, and Fine irregularities are formed by the magnetic powder 20. For this reason, the hardened surface also becomes an uneven surface due to the magnetic powder 20.

FIG. 6 shows a state in which an uncured resin is applied to the cured surface of the photocured resin which has been made uneven by the magnetic powder 20. Due to the unevenness of the magnetic powder 20, the coating defect 22 of the coating resin when scraping the uncured surplus resin 19 when the squeegee 3 moves can be suppressed.

As the material of the magnetic powder 20, gamma FeO ₃ was used.

The effect of mixing the magnetic powder 20 with the photocurable resin was observed at 3% by weight or more. However, when the content is 10% by weight or more, the strength of the photocured product is reduced, which is not preferable.

[0016]

According to the present invention, in order to obtain a shape model with high dimensional accuracy, it is possible to prevent coating unevenness and coating loss due to resin "repelling" on a coating surface when a small pitch is to be applied. A stereolithography model without defects can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optical shaping apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the conventional optical shaping apparatus.

FIG. 3 is a cross-sectional view showing a state in which excess resin is scraped off in the related art.

FIG. 4 is a cross-sectional view showing a conventional state in which excess resin is being scraped.

FIG. 5 is an operation explanatory view showing how an uncured resin is scraped according to the embodiment of the present invention.

FIG. 6 is an operation explanatory view showing how an uncured resin is scraped off according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light hardening resin, 2 ... Light hardening resin tank, 3 ... Squeegee, 4 ... Slide rail, 5 ... Squeegee drive means, 6 ...
Resin sucking means, 7 hose, 8 small tank, 9 heating means, 10 resin discharge nozzle, 11 work table,
12: Z-axis moving means, 13: optical laser beam, 14: laser oscillator, 15: galvanometer mirror, 16: galvanometer mirror control circuit, 17: stereolithography system control circuit, 18: contour drawing data, 19: surplus resin, 20 ... magnetic powder, 21 ...
Magnetic field applying means, 22: coating defect, 23: prescribed liquid level.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshiro Endo 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Headquarters, Hitachi, Ltd. 6-chome Inside Hitachi, Ltd. (72) Inventor Masanao Fukuda 3-14-20 Higashinakano, Nakano-ku, Tokyo F-term (reference) 4F213 AA44 AB13 WA25 WA97 WL03 WL12 WL25 WL67 WL87 WL92

Claims (3)

[Claims] 1. A laser light oscillating means and ON / O of the laser light.
FF switch means, convergence means of the laser light, planar scanning means of the laser light, a photocurable resin container, a work table provided so as to sink in the photocurable resin container, and a liquid surface of the photocurable resin container. A coating means for coating the photo-curable resin, and a control means for controlling these, storing the photo-curable resin in the photo-curable resin container, and applying the converged laser light to the liquid surface of the photo-curable resin according to shape data. Irradiating and scanning, exposing and curing the photocurable resin on a work table, applying an uncured photocurable resin on the cured layer in a layered manner by the application means, and exposing and curing the uncured layer. In the optical molding method of forming a shape model by successively laminating, a photocurable resin mixed with magnetic powder is used as the photocurable resin, a magnetic field is applied to the photocurable resin application surface, and the magnetic surface Fine by powder Optical modeling method, wherein the exposing curing the coated surface after generating the irregularities. 2. A laser light oscillating means and ON / O of the laser light.
FF switch means, convergence means of the laser light, planar scanning means of the laser light, a photocurable resin container, a work table provided so as to sink in the photocurable resin container, and a liquid surface of the photocurable resin container. A coating means for coating the photo-curable resin, and a control means for controlling these, storing the photo-curable resin in the photo-curable resin container, and applying the converged laser light to the liquid surface of the photo-curable resin according to shape data. Irradiating and scanning, exposing and curing the photocurable resin on a work table, applying an uncured photocurable resin on the cured layer in a layered manner by the application means, and exposing and curing the uncured layer. A magnetic resin is mixed as a photo-curing resin for stereolithography for forming a shape model by successively laminating to form a shape model. 3. A laser light oscillating means and ON / O of the laser light.
FF switch means, convergence means of the laser light, planar scanning means of the laser light, a photocurable resin container, a work table provided so as to sink in the photocurable resin container, and a liquid surface of the photocurable resin container. It consists of an application means for applying the photocurable resin and a control means for controlling these, stores the photocurable resin in the photocurable resin container, and applies the converged laser light on the liquid surface of the photocurable resin according to the shape data. Irradiate, scan,
The photocurable resin is exposed and cured on a work table, an uncured photocurable resin is applied on the cured layer in a layered manner by the application unit, and the exposure and curing of the uncured layer is repeated and sequentially laminated. An optical shaping apparatus for forming a shape model by using a magnetic field applying means for applying a resin to a resin-coated surface.