KR20190004860A - 3d printer for photocurable and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a photocurable 3D printer and a product molding method. The printer comprises: a resin tank in which a photocurable resin and a high specific gravity liquid are stored; an optical module installed under the resin tank to irradiate the light source with respect to the photocurable resin; a build plate on which the photocurable resin is cured and adhered by the optical module and which can move up and down in a vertical direction; and a pressure control tube for controlling the internal pressure of the high specific gravity liquid. Accordingly, the resin cured product can be fundamentally prevented from being adhered to the bottom of the resin tank and thus failing the lamination process, thereby enhancing the quality of the resulting product. A printed product having a structure of a wide cross section area can be more efficiently produced, and the process time for the laminating process can be shortened, so that the productivity of the product can be greatly increased.

Description

TECHNICAL FIELD [0001] The present invention relates to a photocurable 3D printer,

The present invention relates to a photo-curable 3D printer and a method for molding a product, and more particularly, to a method of forming a photo-curable 3D printer and a product using the photo-curable resin, To a photocurable 3D printer capable of shortening the time and a method for molding the product.

Generally, a 3D printer means an automated apparatus for outputting electronic information for implementing a three-dimensional shape. In ISO and ASTM, these AM technologies are classified into three types: Binder jetting, Directed energy deposition (DED), Material extrusion, Material jetting, Powder bed fusion, Sheet lamination, Vat Photopolymerization ).

In the case of the VP type 3D printer, it is widely used recently because it is easy to implement a fine shape. UV (Ultraviolet Ray) photocurable resin, which is a material that is cured by ultraviolet rays, is used as a raw material for the liquid used in the VP type 3D printer.

In addition, the VP-type 3D printer is divided into a bottom-up method for completing the output from the bottom up according to the mechanical structure and a top-down method for completing the output from the top down.

Hereinafter, a conventional photocurable VP type 3D printer will be described with reference to FIG.

As shown in the figure, the conventional photo-curable 3D printer includes a resin tank 100 in which a photo-curable resin 110 is stored, an optical module 200 for irradiating light from a lower portion of the resin tank 100, And a build plate 300 that moves up and down with respect to the resin tank 100 so as to fix and support the cured resin hardened material 110a by the optical module 200 and to form a plurality of resin cured materials do.

That is, when light of the optical module 200 is irradiated while the build plate 300 is positioned close to the bottom surface of the resin tank 100 containing the photo-curing resin 110, The light curable resin 110 located between the bottom surface and the build plate 300 changes to a hardened resin cured material 110a. Accordingly, the output product is completed by stacking the resin cured product 110a by raising and lowering the build plate 300 step by step.

However, the photocurable 3D printer according to the related art has the same effect on the bottom surface of the resin tank 100 during the curing of the photocurable resin 110 between the build plate 300 and the bottom surface of the resin tank 100 A phenomenon occurs in which the resin cured product 110a is fixed. Therefore, there is a problem that a failure of the lamination process frequently occurs due to the phenomenon that the lower surface of the resin cured product 110a is fixed to the bottom surface of the resin tank 100. [

This failure in the lamination process is caused not only by the larger area of the unit area of the unit area where the photo-curable resin 110 is cured, but also by the failure of the lamination process, There is a problem that product production is not efficient due to remarkably reducing the lifting / moving speed.

Korean Patent Registration No. 1647799 (Aug. 20, 2016)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and an object of the present invention is to provide a 3D printer using a photo- Which can shorten the time required for the production of a photo-curable 3D printer and a product.

To achieve the above object, a photocurable 3D printer according to the present invention comprises a resin tank in which a photocurable resin is stored; An optical module installed under the resin tank for irradiating an image to the photocurable resin; And a build plate capable of moving up and down in a vertical direction so as to laminate cured resin cured products according to the irradiated image, characterized in that a high-boiling liquid having a specific gravity larger than that of the photo- .

The resin tank is filled with a high boiling liquid and a photo-curable resin, and the two materials are pressure-parallelized. And the pressure plate is equilibrated in order to make the pressure plate parallel to the pressure-parallel state due to the lifting movement of the photo-curable resin of the resin tank.

When the build plate is moved up and down, the internal pressure parallel state of the high-boiling liquid formed by the photo-curable resin is broken, and a pressure control pipe for returning it to a parallel state is installed.

The pressure regulating tube is a hollow tube which is installed inside or on one side of the resin tank. The tube is located at a position where one end communicates with the high-boiling liquid and the other end is located in the atmosphere. .

A sensing sensor may be further provided to determine an initial position and a horizontal angle position of the build plate based on a boundary line between the photocurable resin and the high-boiling liquid stored in the resin tank.

A product molding method of a photo-curable 3D printer according to the present invention is a product molding method of a photo-curable 3D printer comprising a resin tank, an optical module and a build plate, the product molding method comprising the steps of: injecting a high-boiling liquid into the resin tank; ; A resin injecting step of injecting a photo-curable resin into the resin tank; Disposing a build plate over the boundary layer between the high boiling liquid and the photocurable resin; And a product molding step in which the light source of the photosensor module transmits the high-boiling liquid to process the photo-curing resin into a resin cured product.

According to the present invention having the above-described constitution, by constituting a high-boiling liquid having a specific gravity larger than that of the photo-curable resin, it is possible to prevent the phenomenon that the photo-curable resin is stuck to the bottom surface of the resin tank in the same way It is possible to fundamentally prevent the resin cured product from sticking to the bottom of the resin tank and to prevent the failure of the lamination process, thereby enhancing the quality of the product, and more efficiently producing the output structure having a wide cross- In addition, since the process time for the lamination process can be shortened, the productivity of the product can be greatly increased.

In addition, the resin tank is provided with a pressure control tube for controlling the internal pressure of the high-boiling liquid, so that the mutual pressure parallel state of the photo-curable resin and the high boiling liquid is broken due to the movement pressure at which the build- Thereby providing an effect of quickly restoring the state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the construction of a conventional photocurable 3D printer. FIG.
2 is a cross-sectional view illustrating the construction of a photocurable 3D printer according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a structure including the pressure control pipe in the resin tank of FIG. 2;
4 is a cross-sectional view illustrating an operation of a photocurable 3D printer according to an exemplary embodiment of the present invention.
FIG. 5 is a cross-sectional view illustrating a configuration in which a sensing sensor for determining an initial position and a horizontal angle position of the build plate of FIG. 2 is applied.
6 is a flowchart illustrating a product molding method of a photo-curable 3D printer according to an embodiment of the present invention

Hereinafter, preferred embodiments of the photocurable 3D printer according to the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and that the inventor should properly interpret the concepts of the terms to best describe their invention It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. In addition, since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It is to be understood that equivalents and modifications are possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6 attached hereto.

As shown in the figure, the photo-curable 3D printer according to the present invention includes a resin tank 100 in which a photo-curing resin 110 and a high-boiling liquid 120 are stored, a resin tank 100 installed under the resin tank 100, An optical module 200 for irradiating a light source with respect to the resin 110, a build plate 300 to which the photo-curing resin 110 is hardened by the optical module 200 and can be moved up and down, And a pressure regulating pipe 400 for regulating the internal pressure of the high boiling liquid 120.

The resin tank 100 is a container for storing the photo-curing resin 110 and the high-boiling liquid 120. The resin tank 100 includes a reservoir 100 for storing the photo-curable resin 110 and the high- A portion 101 is formed.

The resin tank 100 may be constructed to have a larger area than the build plate 300 so that the build plate 300 can be smoothly moved up and down without interference.

It is preferable that the resin tank 100 is made of a transparent material on the bottom surface so that the photo-curable resin 110 can be cured by a light source.

That is, the resin tank 100 is limited to the bottom surface and may be made of a transparent material and the remaining portion may be made of an opaque material.

The inner bottom of the resin tank 100 according to the present invention is filled with a high-boiling liquid 120 having a specific gravity larger than that of the photocurable resin 110.

That is, in the resin tank 100, the high-boiling liquid 120 is positioned below and the photo-curable resin 110 is located above the resin tank.

The resin tank 100 according to the embodiment of the present invention is fabricated in the same shape as that of the space 101 for storing the photo-curing resin 110 and the high-boiling liquid 120, And the storage space 101 may be formed in a shape having a different width based on a boundary layer between the photocurable resin 110 and the high-boiling liquid 120. [

The resin tank 100 is preferably formed in a rectangular shape, but is not limited thereto. The resin tank 100 may be formed in a circular, elliptical or polygonal shape.

The optical module 200 is installed at a lower portion spaced apart from the resin tank 100. The optical module 200 irradiates a light source to the photo-curable resin 110 to form a hardened resin cured product 110a, respectively.

The optical module 200 may include an irradiation head 210 for irradiating a bottom layer of the photocurable resin 110 and a movement controller 220 for moving the photocurable resin 110 in a vertical direction or a horizontal direction.

The irradiation head 210 includes a function of varying the output intensity of the wavelength band of the light source in accordance with the components of the photocurable resin 110.

Meanwhile, the build plate 300 is attached with a resin cured material 110 a cured by a light source, and moves up and down in a direction away from the optical module 200.

The build plate 300 is formed such that the photo-curable resin 110 accommodated in the storage space 101 of the resin tank 100 is irradiated with light from the optical module 200 and continuously laminated with the resin cured material 110a. Provide space to be created as a structure.

Accordingly, the resin cured material 110a adhered to the build plate 300 in a cured state can be further stacked by the optical module 200, thereby completing a three-dimensional output form.

It is a matter of course that a separate driving device (not shown) is provided for moving the build plate 300 up and down.

The driving device may be composed of a motor, a screw, and a control unit, or a solenoid and a control unit.

The driving device for moving the build plate 300 up and down is the same as or similar to the already known technology, and its detailed configuration and operation will be omitted.

The resin tank 100 according to the present invention further comprises a high boiling liquid 120 having a specific gravity larger than that of the photocurable resin 110.

That is, the storage space portion 101 of the resin tank 100 maintains a layered state in which two kinds of liquids having different physical properties are not mixed. The high boiled liquid 120 is located below the resin tank 100 and the light curable resin 110 is located above the high boiled liquid 120.

The reason for the structure of the high boiling liquid 120 is that when the photocurable resin 110 is cured between the build plate 300 and the bottom surface of the resin tank 100, So that it is possible to prevent a fixing force from being generated on the bottom surface of the resin tank 100.

In other words, since the photo-curable resin 110 does not contact the bottom surface of the resin tank 100 but is cured at a position spaced apart by the high-boiling liquid 120, the curing of the photo- Since the fixing force according to the action is applied only to the build plate 300, it is possible to prevent the failure of the lamination process caused by the phenomenon that the cured photocurable resin 100 is fixed to the bottom surface of the resin tank 100 In addition, the lamination process can be performed more quickly, and the productivity of the product can be greatly increased.

In addition, the step of laminating the photo-curing resin 100 using the high-boiling liquid 120 provides a very useful effect in producing the resin cured product 110a having a wide sectional area.

This is to make it possible to keep a predetermined amount of liquid state without being easily vaporized by the irradiation heat of the optical module 200, so that the boundary layer of the two liquids can be kept constant.

In addition, the pressure parallel state between the photo-curable resin 110 and the high-boiling liquid 120 is broken by the moving pressure of the build-up plate 300 in the resin tank 100, A pressure regulation tube 400 is installed.

Specifically, the pressure control tube 400 is a hollow tube that is installed in a standing state on one side of the resin tank 100. One end in the longitudinal direction is in a position to communicate with the high-boiling liquid 120, Is placed in the atmosphere so that the inner pressure equilibrium state of the liquid in the high boiling ratio can be kept constant.

Of course, a certain amount of high boiling liquid 120 may be filled in the hollow of the pressure regulating tube 400.

5 shows another embodiment for determining the initial position and the horizontal angle position of the build plate 300. Herein, the initial position and the horizontal angle position of the build plate 300 are constituted by the detection sensor 500 can do.

That is, the sensing sensor 500 senses the boundary line between the photocurable resin 110 and the high-boiling liquid 120 in advance, and positions the build plate 300 at the position of the sensed resultant value.

Here, the detection sensor 500 can be installed by applying various structures excellent in distance detection such as a laser sensor and an ultrasonic sensor.

Hereinafter, a product molding method of the photo-curable 3D printer according to the present invention will be described.

First, a high-boiling liquid injecting step (S100) of injecting a high boiling liquid 120 into the resin tank 100 is performed.

Then, a resin injecting step (S200) for injecting the photo-curable resin 110 into the resin tank 100 is performed.

Thereafter, a step S300 of placing the build plate 300 on the boundary layer between the high-boiling liquid 120 and the photocurable resin 110 is performed.

Next, the product forming step S400 of processing the light-curable resin 110 into the resin cured product 110a is performed by the light source of the photo-integration module 200 through the high-boiling liquid 120. [

When the resin cured product 110a is fixed to the build plate 300, the build plate 300 moves upward. At this time, a gap (space for forming a resin cured product) is formed between the build plate and the high-boiling liquid 120 by a distance at which the build plate 300 rises, and a photo-curable resin 110 Will be replenished. When the photo-curable resin 110 thus filled is filled, the process of varying the resin cured material 110a by the optical module 200 is repeated to complete the set three-dimensional object.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Will be apparent to those of ordinary skill in the art.

100: Resin tank 110: Photocurable resin
120: high boiling liquid 200: optical module
300: Build plate 400: Pressure regulating tube
500: Detection sensor

Claims (3)

A resin tank in which a photocurable resin and a high boiling liquid are stored;
An optical module installed under the resin tank to irradiate the light source with respect to the photocurable resin;
A build plate on which the photo-curable resin is cured and adhered by the optical module and which can move up and down in a vertical direction; And
And a pressure control tube for controlling the internal pressure of the high-boiling liquid.
The method according to claim 1,
Wherein the pressure regulating tube is a hollow tube installed in the resin tank and has one end communicating with the high boiling liquid and the other end located in the atmosphere.
1. A product molding method for a photo-curable 3D printer comprising a resin tank, an optical module and a build plate,
Injecting a high-boiling liquid into the resin tank;
A resin injecting step of injecting a photo-curable resin into the resin tank;
Disposing a build plate over the boundary layer between the high boiling liquid and the photocurable resin; And
And a product molding step of processing the light-curing resin into a resin cured product by passing the high-boiling liquid through a light source of the photosensor module.

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