WO2017164642A2

WO2017164642A2 - Photo-curing type 3d forming device

Info

Publication number: WO2017164642A2
Application number: PCT/KR2017/003072
Authority: WO
Inventors: 이병극
Original assignee: 이병극
Priority date: 2016-03-22
Filing date: 2017-03-22
Publication date: 2017-09-28
Also published as: WO2017164642A3; KR101842511B1; KR20170109834A

Abstract

The purpose of the present invention is to provide a photo-curing type 3D forming device enabling a formed article, which is being cured in a resin tub, to move relatively stably without being damaged in spite of the photocuring reaction heat of a photo-curable resin and operation fatigue. To this end, the photo-curing type 3D article forming device according to the present invention comprises: a resin tub; a photo-curable resin layer formed of a photo-curable resin, and accommodated in the resin tub so as to form a layer; a release layer formed of a non-curable flowable material having a gravity different from that of the photo-curable resin, and having a releasable surface contacting the photo-curable resin layer, and accommodated in the resin tub; a forming plate accommodated in the photo-curable resin layer so as to support the formed article; an elevating driving unit for elevating the forming plate and/or the resin tub such that the forming plate can come close to or be spaced apart from the releasable surface; and an image light emitting unit for emitting image light at the photo-curable resin layer by penetrating the release layer.

Description

Photo-curable 3D molding machine

The present invention relates to a photocurable 3D molding apparatus.

The photocurable 3D molding apparatus includes a resin tank having a transparent bottom plate, a photocurable resin accommodated in the resin bath, a molding plate that can be lifted and lowered in the resin tank, and an image light irradiator for irradiating light to the photocurable resin, The 3D molded article is formed while exposing and curing a photocurable resin using an irradiation part, and raising a model plate.

By the way, when the bottom plate is made of an inelastic hard material such as glass, there is a problem that the mold release is not easy to be released, the damage is likely to occur in the molding state. On the other hand, in order to solve this problem has been disclosed a technique for installing an elastically deformable release sheet on the resin bottom plate, there is a problem that the durability is weak due to reaction heat and operating fatigue caused by curing the photocurable resin.

SUMMARY OF THE INVENTION An object of the present invention is to provide a photocurable 3D molding apparatus which allows a molded article to be cured in a resin bath to be moved relatively stably without damage in spite of the photocuring reaction heat and operating fatigue of the photocurable resin.

Photocurable 3D molding apparatus according to the present invention for achieving the above object is a resin tank; A photocurable resin layer made of a photocurable resin and contained in the resin bath to form a layer; A release layer made of a non-curable flowable material having a specific gravity different from that of the photocurable resin, and having a release surface in contact with the photocurable resin layer; A molding plate for supporting a molding in the resin tank; An elevating driving unit configured to elevate at least one of the molding plate and the resin tank so that the molding plate is spaced apart from the release surface; And an image light irradiation part that transmits the image light to the photocurable resin layer through the release layer.

The resin bath has a transparent bottom plate, the non-curable flowable material has a specific gravity higher than that of the photocurable resin, and the lifting and driving part is based on the image light irradiation operation of the image light irradiating part, and the mold plate is the release surface. It is desirable to raise so as to space apart.

In addition, the non-curable flowable material has a specific gravity lower than that of the photocurable resin, and the lifting and lowering part is preferably lowered so that the model plate is spaced apart from the release surface based on the image light irradiation operation of the image light irradiation unit.

In addition, it is preferable to further include a base layer having a specific gravity higher than the photocurable resin to form a layer under the photocurable resin layer.

And the non-curable flowable material preferably contains fluorine.

The photocurable 3D molding apparatus according to the present invention allows the molded article to be cured in the resin tank to be moved relatively stably in spite of the photocuring reaction heat and operating fatigue of the photocurable resin.

1 is an explanatory view showing a photocurable 3D molding apparatus according to the present invention.

2 is an explanatory view showing a photocurable 3D molded article molding apparatus according to another embodiment of the present invention.

1 is an explanatory view showing a photocurable 3D molding apparatus according to the present invention. As can be seen in Figure 1, the photocurable 3D molding apparatus according to the present invention comprises a cylindrical resin tank 100 and a lifting plate-shaped molding plate 500 for supporting the molding in the resin tank 100 do. Here, the resin tank 100 has a transparent bottom plate 110 through which light can pass, and the molding plate 500 is connected to the lifting driving part 700. The lifting driving part 700 may raise and lower the molding plate 500. The lower surface of the molding plate 500 is preferably disposed in parallel with the bottom plate (110). The lifting driving unit 700 may elevate the resin tank 100 or elevate the molding plate 500 and the resin tank 100 at the same time. An image light irradiator 800 for irradiating light toward the bottom plate 110 is disposed below the bottom plate 110 of the resin tank 100.

The resin tank 100 is made of a photocurable resin and is made of a photocurable resin layer 200 accommodated in the resin tank 100 to form a layer, and a non-curable flowable material having a specific gravity different from that of the photocurable resin. The release layer 300 accommodated in the resin tank 100 with the release surface 310 in contact with the chemical conversion layer 200 is disposed. Here, the non-curable flowable material constituting the release layer 300 has a specific gravity higher than that of the photocurable resin constituting the photocurable resin layer 200. Accordingly, the release layer 300 is disposed above the bottom plate 110 and is disposed between the bottom plate 110 and the photocurable resin layer 200.

Both the photocurable resin layer 200 and the release layer 300 made of a non-curable flowable material are liquid materials.

The thickness of the release layer 300 is preferably 0.1mm to 50mm. If the thickness of the release layer 300 is too thin, the release layer partially due to the flow of the molding plate 500 moving inside the resin tank 100 and the molding 600 supported on the molding plate 500. The 300 is not present or is excessively thin, causing the light energy to be biased, thereby deteriorating the molding quality, or forming unwanted hardened foreign matter in the bottom plate or the resin layer. If the thickness of the release layer 300 is too thick, the transmittance of the image light may be lowered, thereby lowering the photocurable photocuring efficiency.

And the non-curable flowable material constituting the release layer 300 should be selected to have a sufficiently high boiling point. When the photocurable resin generates heat of reaction during the photocuring process and the non-curable flowable material changes phase by the heat of the curing reaction, the molding quality of the molded product 600 may be reduced. Thus, the boiling point of the non-curable flowable material constituting the release layer 300 is preferably higher than the boiling point of water, more preferably 90 ° C. or higher.

In addition, the kinematic viscosity of the non-curable flowable material is preferably 0.4cst to 50cst based on 25 ℃. When the kinematic viscosity of the non-curable flowable material is 0.4cst or less at 25 ° C, excessive flow occurs even at a small force, thereby deteriorating the molding quality of the molded product 600. If the viscosity is 50cst or more, the process of injecting or processing into the resin tank 100 is performed. There is a problem that is difficult to handle.

The thickness of the photocurable resin layer 200 is preferably 50 mm or less, more preferably 20 mm or less. When the modeling plate 500 moves up and down, flow inevitably occurs in the photocurable resin layer 200 and the release layer 300. As a result, the release surface 310 is oscillated, resulting in poor light transmission homogeneity, impairing the molding quality, and it may take time for the release surface to be stabilized flatly, thus reducing work efficiency. In order to minimize such dynamic instability, the thickness of the resin layer 200 is preferably as thin as possible. The preferred thickness of the resin layer is inversely proportional to the area of the molding plate 500. For example, if the area of the molding plate 500 exceeds 5000mm², the thickness of the resin layer 200 preferably does not exceed 20mm, and if the area of the molding plate 500 is 3600mm² or less, the resin layer thickness may be up to about 50mm. Can be.

The specific gravity of the release layer 300, which is a non-photocurable material, is 1.5 times or more, preferably 2 times or more, and more preferably 3 times or more, relative to the specific gravity of the photocurable resin. As the release layer 300 has a higher specific gravity, the release layer 300 may be less affected by the lifting motion of the molding plate 500, thereby stably maintaining the release surface 310. The material of the release layer 300 is a commercially available high-density liquid resin, and generally a fluorine-based synthetic resin may be appropriately used.

On the other hand, it is preferable that a coating layer 130 is formed on the inner wall surface and / or the bottom surface of the resin tank 100 to prevent adhesion of a resin or the like. The coating layer 130 is formed of a Teflon-based or fluorine-based material and has at least a light transmittance on the bottom surface. The coating layer 130 may be formed of a material mainly containing a material corresponding to group 18 of the periodic table in addition to the teflon-based or fluorine-based. The coating layer 130 may be replaced with a separation film or sheet disposed along the bottom and / or wall.

In addition, a protective liquid layer (not shown) having a specific gravity lower than that of the photocurable resin may be disposed on the resin layer 200. This protective liquid layer is made of a material having low reactivity to light, and serves to prevent the molding from being exposed to the air. In the case of a long molding, since the initially molded part may be exposed to air for a relatively long time and the molding quality may be degraded by oxidation or deformation, the protective liquid layer serves to prevent such a risk of oxidation.

The 3D molding method based on the photocurable 3D molding apparatus having such a structure is as follows. First, a non-curable flowable material having a specific gravity different from that of the photocurable resin and the photocurable resin is introduced into the resin tank 100, and is made of the photocurable resin layer 200 made of the photocurable resin and the noncurable flowable material. The release layer 300 having the release surface 310 in contact with the resin layer 200 is disposed. Here, the non-curable flowable material constituting the release layer 300 has a higher specific gravity than the photocurable resin constituting the photocurable resin layer 200, so that the release layer 300 and the photocurable resin layer 200 and the bottom plate ( 110).

Next, the image plate is irradiated to the photocurable resin layer 200 using the image light irradiator 800, and the molding plate 500 disposed in the resin bath 100 to support the molded product 600 is a release surface ( While driving the lifting drive unit 700 so as to be spaced apart from the 310 is molded in a desired shape. Here, the image light passes through the transparent bottom plate 110 and the release layer 300 to reach the photocurable resin layer 200. The molding plate 500 is preferably such that the molding layer of the molding accumulates while continuously spaced with respect to the release surface 310. Alternatively, after the molding of the unit layer is completed, the mold plate 500 may be released and then lowered again to approach the release surface 310 at intervals corresponding to the thickness of the unit layer. When the molding plate 500 moves, it is preferable that the molding plate 500 and the molded product do not interfere with the release layer 300 as much as possible.

The lifting driving part 700 does not lift and move the molding plate 500, while lifting the resin tank 100 or lifting the resin tank 100 and the molding plate 500 together, the molding plate 500 is a release surface ( 310 may be spaced apart.

2 is an explanatory view showing a photocurable 3D molded article molding apparatus according to another embodiment of the present invention. As can be seen in Figure 2, the photocurable 3D molding apparatus according to another embodiment of the present invention is a plate-like lifting and lifting plate for supporting the molded part (600a) in the resin tank (100a) and the resin tank (100a) It includes a molding plate (500a) of. Here, the resin tank 100a may be open at an upper portion thereof so that light may pass therethrough. The resin bath 100a may have an upper light transmitting part made of a transparent material. The molding plate 500a can be lifted and lowered in the resin tank 100a by the lifting driving part 700a. The upper surface of the molding plate 500a is formed flat to support the molding. Since the molding plate 500a moves up and down relative to the resin tank 100a, the lifting driving part 700a raises and lowers the resin tank 100a or individually lifts the resin tank 100a and the molding plate 500a. You can also On the upper side of the resin tank 100a, an image light irradiation part 800a for irradiating light toward the resin tank 100a is provided.

The resin tank 100a is made of a photocurable resin and is made of a photocurable resin layer 200a that is accommodated in the resin tank 100a to form a layer, and a non-curable flowable material having a specific gravity lower than that of the photocurable resin. The release layer 300a which has the release surface 310a which contacts the chemical conversion resin layer 200a, and forms a layer in the upper part of the photocurable resin layer 200a is arrange | positioned. The release layer 300a improves the molding quality by increasing the dynamic stability of the upper surface of the resin layer 200a, that is, the release surface 310a, and prevents the photocurable resin from directly contacting air to prevent oxidation or contamination of the resin. It plays a role.

The base layer 400a may be disposed below the photocurable resin layer 200a in the resin tank 100a. The base layer 400a is formed of a base liquid material having a specific gravity higher than that of the resin of the photocurable resin layer 200a, and serves to fill the lower space of the resin tank 100a. Thus, the base liquid material constituting the base layer 400a has a lower purchase and replacement cost than the photocurable resin, and preferably has a higher surface tension than water or the photocurable resin.

In the case of forming a large molded product, the base layer 400a is deeply immersed into the molded object 600a. In this case, the base layer 400a does not have to accommodate a large amount of resin in the resin layer 200a, thereby enabling economical operation.

On the other hand, the photocurable 3D molding apparatus is provided with a separate level control unit (not shown) to adjust the water level fluctuated by the falling of the molding plate 500a and the molding 600a supported on the molding plate 500a. Can be. The level control unit includes a resin supply tank, a supply valve, and a level sensor, and the controller controls the supply valve based on the level signal from the level sensor to supply or withdraw resin from the resin supply tank to maintain the level.

The thickness of the release layer 300a is preferably 0.1 mm to 50 mm. When the thickness of the release layer 300a is 0.1 mm or less, the thickness is partially due to the flow due to the movement of the molding plate 500a moving inside the resin bath 100a and the molding 600a supported by the molding plate 500a. The photocurable resin may be ejected from the thinned portion, and the photocurable resin may be cured on the release layer 300a.

When the thickness of the release layer 300a is 50 mm or more, the transmittance of the light irradiated from the image light irradiation part 800a may be lowered, which may lower the photocuring efficiency.

The boiling point of the non-curable flowable material forming the release layer 300a is preferably 90 ° C. or higher. When the boiling point of the non-curable flowable material is less than 90 ° C., the phase change is caused by the heat of curing reaction of the photocurable resin reacting to the light irradiated from the image light irradiating part 800a, thereby making the release surface unstable and thus the molding 600a. There is a fear that the molding quality of the resin may decrease.

In addition, the kinematic viscosity of the non-curable flowable material is preferably 0.4cst to 50cst based on 25 ℃. When the kinematic viscosity of the non-curable flowable material is 0.4cst or less at 25 ° C, excessive flow occurs even at a small force, thereby deteriorating the molding quality of the molded article 600a. There is a problem that is difficult to handle.

In the 3D molding method based on the photocurable 3D molding apparatus according to another embodiment of the present invention, first, a non-curable fluid material having a specific gravity lower than that of the photocurable resin and the photocurable resin is introduced into the resin tank 100a, thereby providing a photocurable resin. The release layer 300a is formed of a photocurable resin layer 200a and a non-curable flowable material having a release surface 310a in contact with the photocurable resin layer 200a. Here, the base layer 400a may be formed by injecting a base liquid material having a specific gravity higher than that of the photocurable resin and having a non-photocurable property to the lower portion of the resin layer 200a. The base layer 400a serves to sufficiently secure the moving width of the molding while keeping the thickness of the resin layer 200a to a minimum.

Next, the image plate is irradiated onto the photocurable resin layer 200a using the image light irradiator 800a and at the same time, the molding plate 500a disposed in the resin bath 100a to support the molded part 600a has a release surface ( The molded article having a desired shape is molded while driving the lifting driving part 700a to be spaced apart from the 310a). Here, the image light passes through the release layer 300a to reach the photocurable resin layer 200a, and the molding plate 500a is continuously spaced apart from the release surface 310a. The lifting driving part 700a may lift or lower the resin tank 100a or allow the molding plate 500a to be spaced apart from the release surface 310a while lifting and lowering the resin tank 100a and the molding plate 500a together.

In the above-described and illustrated embodiments, the resin layers 200 and 200a and the release layers 300 and 300a directly contact to form the release surfaces 310 and 310a. However, a release film made of a light transmissive film, a sheet, or a thin plate may be interposed on the release surfaces 310 and 310a. This release film regulates the liquid level of the release layers 300 and 300a to contribute to the dynamic stability of the release surface. It is preferable that such a release film is provided with appropriate surface treatment such as coating so as not to cause adhesion of a resin or a release layer material. The coating may be formed of a Teflon-based or fluorine-based release material.

In the above-described and illustrated embodiments, the

molding plates

500 and 500a supporting the molded article are simple plate-shaped bodies. Such a molding plate is inevitably subjected to a large resistance to movement due to the viscosity and capillary phenomenon of the liquid resin in the process of release and lifting. In particular, the larger the cross-sectional area of the plate surface and the molding of the molding plate, the greater the resistance. In order to reduce the resistance of this lifting movement, the molding plate of the apparatus according to the present invention may have a passage hole or a discharge groove through which the resin can pass. The through hole reduces the flow resistance by allowing the liquid resin to flow through the molding plate in the transverse direction to the plate surface direction of the

molding plates

500 and 500a. The size of the through hole is selected to a size of about 1 ~ 10mm, it is preferable to form in the position out of the area of the molding as possible. The discharge groove is provided in a groove shape formed by cutting a part of the thickness of the molding plate so that the liquid resin is discharged outward along the plate surface direction. This discharge groove is also preferably provided at a position outside the region of the molding.

100, 100a: resin tank 110, 110a: bottom plate

130:

coating layer

200, 200a: photocurable resin layer

300, 300a:

release layer

310, 310a: release surface

400a:

base layer

500, 500a: molding plate

600, 600a: Molded

product

700, 700a: Lift driving part

800, 800a: image light irradiation unit

The present invention is a photocurable 3D molding apparatus is used in various industrial fields, such as the production of small quantity parts of various kinds, machinery industry, electronic industry, information industry, chemical industry and the like.

Claims

In the photocurable 3D molding apparatus,

Resin tank;

A photocurable resin layer made of a photocurable resin and contained in the resin bath to form a layer;

A release layer made of a non-curable flowable material having a specific gravity different from that of the photocurable resin, and having a release surface in contact with the photocurable resin layer;

A molding plate for supporting a molding in the resin tank;

An elevating driving unit configured to elevate at least one of the molding plate and the resin tank so that the molding plate is spaced apart from the release surface;

And an image light irradiating part that transmits the image light to the photocurable resin layer through the release layer.
The method of claim 1,

The resin bath has a transparent bottom plate,

The non-curable flowable material has a specific gravity higher than that of the photocurable resin,

And the lifting and lowering drive unit lifts the modeling plate apart from the release surface based on the image light irradiation operation of the image light irradiation unit.
The method of claim 1,

The non-curable flowable material has a specific gravity lower than that of the photocurable resin,

And the lifting and lowering unit lowers the molding plate to be spaced apart from the release surface based on the image light irradiation operation of the image light irradiation unit.
The method of claim 3,

And a base layer having a specific gravity higher than that of the photocurable resin and forming a layer under the photocurable resin layer.
The method according to any one of claims 1 to 4,

And the non-curable flowable material comprises fluorine.