WO2015170890A1

WO2015170890A1 - 3d-printing apparatus

Info

Publication number: WO2015170890A1
Application number: PCT/KR2015/004553
Authority: WO
Inventors: 이병극
Original assignee: 이병극
Priority date: 2014-05-07
Filing date: 2015-05-07
Publication date: 2015-11-12
Also published as: KR101815617B1; KR20160131845A

Abstract

Disclosed is a 3D-printing apparatus comprising: a resin tank having a resin tank main body with light-penetrating holes on the bottom thereof and accommodating light-curing resin, and a flexible bottom plate made of transparent and flexible material for blocking the light-penetrating holes of the resin tank main body; a molding plate unit comprising a molding plate having a bottom surface parallel to the flexible bottom plate and disposed in the interior of the resin tank, and a molding plate driving unit for vertically driving the molding plate; a light irradiating unit for irradiating an image-shaped beam from the bottom of the resin tank through the light-penetrating holes; and a control unit for controlling so that the molding plate driving unit and the light irradiating unit are linked, wherein the resin tank main body has technical features comprising: a lower main body having the light-penetrating holes; and an upper main body coupled to the lower main body to form a contact-maintaining part in which the soft regions of the flexible bottom plate is interposed in between the upper main body and the lower main body. Accordingly, the bottom plate and the resin layer of the 3D-printing apparatus can be easily separated, and the benefit of maintaining the quality of the molded product is provided.

Description

3D printing device

The present invention relates to a 3D printing apparatus.

A 3D printing apparatus for producing a three-dimensional sculpture is laminated with a resin cured by light to produce a desired sculpture. Inside the resin tank containing the liquid resin, there is a molding plate that can move up and down on the floor. At the bottom of the bottom of the resin tank, a light irradiation device for irradiating image light having a desired shape is installed. When the light is irradiated in the direction of the molding plate, the liquid resin between the bottom of the molding plate and the bottom of the resin bath is cured. To form a resin layer. After one resin layer has been cured, the molding plate is raised by the unit resin layer thickness to stack a new resin layer thereon to form a gap for the new resin layer between the bottom plate and the liquid resin to be filled.

By the way, when the surface area of the cured resin layer is small, the molding plate can be lifted relatively easily from the bottom plate, but when the surface area of the cured resin layer is large, separation for raising the molding plate is not easy. Therefore, in the conventional 3D printer, the vibration was applied to the bottom plate and / or the molding plate or raised by applying a biased force in the oblique direction to the molding plate. However, even by such a method, when the surface area of a resin layer is large, there existed a problem that the separation of a resin layer was not easy and the quality of a molded article fell.

Accordingly, it is an object of the present invention to provide a 3D printing apparatus which can easily separate the bottom plate and the resin layer and increase the quality of the molded article.

In order to achieve the above object, the 3D printing apparatus according to the present invention includes a resin bath main body having a light transmitting hole at a bottom thereof and containing a photocurable resin, and an elastic bottom of a transparent elastic material blocking the light transmitting hole of the resin bath main body. A resin bath having a plate; A modeling plate unit having a bottom surface parallel to the elastic bottom plate and a modeling plate installed in the resin bath, and a modeling plate driving part for elevating and driving the modeling plate; A light irradiation part for irradiating image light upward through the light transmission hole at the bottom of the resin tank; And a control unit for controlling the model plate driving unit and the light irradiation unit to interlock with each other, wherein the resin bath main body is coupled to the lower main body unit and the lower main body unit. It is achieved by the 3D printing apparatus characterized in that it has an upper body portion to form a bite holding portion interposed the edge area of the elastic bottom plate.

Here, the bite holding part preferably has a first biting area extending along the plate surface of the elastic bottom plate and a second biting area bent from the first biting area and extending along the sidewall of the resin bath body. In addition, the upper body portion preferably has a bite accommodating portion for accommodating the lower body portion along the sidewall direction in at least a portion of the region.

And a resin bath support part disposed below the resin bath body and having a support rib protruding upward along the edge of the light transmitting hole to contact the bottom surface of the elastic bottom plate.

Here, the bottom of the elastic bottom plate further includes a reinforcing bottom plate for supporting the elastic bottom plate to prevent sagging and horizontal maintenance of the elastic bottom plate.

The apparatus may further include a frame unit supporting the resin tank, wherein the frame unit is interposed between the upper frame coupled to the resin tank support part, the lower frame supporting the upper frame, and the upper frame and the lower frame. Including a shock absorbing spring can be alleviated the impact generated during the molding of the molding to ensure the quality of the molded article.

Here, the upper frame includes a sliding guide portion disposed to face each other along the length direction of the resin supporting member, and the resin supporting member is slidably coupled through the sliding guide portion.

On the other hand, the elastic bottom plate is thin glass, acrylic plate, polycarbonate (PC), polyvinyl chloride (PVC), ethylene tetrafluoride (TFE), ethylene tetrafluoride propylene (FEP), ethylene tetrafluoroalkoxy perfluoroalkoxy Material of at least one of ethylene (PFA), vinylideneprolide (ETFE), vinylprolide (PVF), chlorotrifluoroethylene (DTFE), ethylenechlorotrifluoroethylene (ECTFE), polyester (PE) It is preferable to be made of.

Here, the elastic bottom plate preferably has a coating layer coated with at least one of a water-repellent anti-fingerprint coating, an oil-repellent anti-fingerprint coating, a low reflection coating, a Teflon coating, a release coating agent.

In addition, the coating layer is polyester (PE), ethylene tetrafluoride (TFE), ethylene tetrafluoride hexafluoropropylene (FEP), ethylene tetrafluoride perfluoroalkoxy ethylene (PFA), vinylideneprolide (ETFE), vinylprolide (PVF), chlorotrifluoroethylene (DTFE) and ethylene chlorotrifluoroethylene (ECTFE) made of at least one material, through which it is possible to extend the service life of the elastic bottom plate.

And a film layer laminated on the surface of the elastic bottom plate, wherein one surface of the film layer includes at least one of a water-repellent anti-fingerprint coating, an oil-repellent anti-fingerprint coating, a low reflection coating, a teflon coating, and a release coating. It is coated with a single material, the adhesive is applied to the back surface of the coating layer, it is preferable to reduce the manufacturing time of the elastic bottom plate to be bonded and laminated on the surface of the elastic bottom plate.

Wherein the film layer is polyester (PE), ethylene tetrafluoride (TFE), ethylene tetrafluoride hexafluoropropylene (FEP), ethylene tetrafluoride perfluoroalkoxyethylene (PFA), vinylideneprolide (ETFE), vinylproline It is preferable that it is made of at least one material of a lide (PVF), chlorotrifluoroethylene (DTFE), ethylene chlorotrifluoroethylene (ECTFE).

According to the configuration of the present invention described above, the bottom plate and the resin layer of the 3D printing apparatus can be easily separated, and the effect of improving the quality of the molded article is provided.

1 is a perspective view of a 3D printing apparatus according to an embodiment of the present invention,

2 is a longitudinal cross-sectional view of FIG.

3 is an enlarged exploded cross-sectional view showing the bonding structure of the resin tank,

Figure 4 is a perspective view showing a coupling structure between the resin tank and the upper frame.

Hereinafter, a 3D printing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the 3D printing apparatus has a resin tank 100 containing a photocurable liquid resin for molding a sculpture. The resin bath 100 is supported by the frame unit 500. The light irradiation part 300 is disposed in the lower portion of the resin tank 100 in the frame unit 500 to irradiate the image light toward the resin tank 100. The frame unit 500 blocks the external light from affecting the light irradiation part 300.

The molding plate 210 of the molding plate unit 200 is provided on the upper portion of the resin tank 100 so as to be liftable. The molding plate 210 is driven up and down by the molding plate driving unit 230. In the lowering state, the molding plate 210 faces the bottom of the resin tank 100 in parallel with a predetermined gap, and when the light from the light irradiation unit 300 is irradiated, the resin in the gap is cured. The unit molding layers are stacked and stacked on the lower surface of the molding plate 210. Thus, the molding plate 210 is spaced apart from the bottom surface of the resin bath 100 so that the unit molding layer is formed by a thickness corresponding to the thickness of the unit molding layer in the lowered state. The modeling plate driver 230 driving the modeling plate 210 vertically raises the modeling plate 210 by the thickness of the resin layer when the light irradiation unit 300 irradiates the image light and the resin layer is cured. Laminate moldings. The interlocking of the light irradiation unit 300 and the model plate driving unit 230 is controlled by the control unit 400.

Referring to FIGS. 2 and 3, the resin tank 100 has a resin tank main body 101 having a light transmission hole 113 at a bottom thereof and accommodating a photocurable resin. The resin bath body 101 is composed of an upper body portion 110 and a lower body portion 130 that are engaged with each other in the vertical direction. The upper body portion 110 is a first bottom flange portion 115 that is bent in a horizontal direction from the lower end of the upper side wall 119 and the upper side wall 119 of the rectangular frame formed along the periphery of the light transmission hole 113. ) The upper side wall 119 of the upper body portion 110 has a bleeding accommodating portion 116, the lower portion of which is open and forms a receiving space extending vertically upward. On the ceiling surface of the bite receiving portion 116, a bite protrusion 117 protruding downward is intermittently formed. Like the upper body portion 110, the lower body portion 130, the lower side wall 139 of the rectangular frame shape, and bent in the horizontal direction from the lower end of the lower side wall 139 along the circumference of the light transmission hole 113 It has an extended second bottom flange portion 135. The lower side wall 139 may be inserted from below into the biting portion 116 of the upper side wall 119. The upper end of the lower side wall 139 is formed with a biting groove 137 corresponding to the biting protrusion 117 of the biting receiving portion 116, the lower body portion 130 is fitted into the inside of the biting receiving portion 116. When combined, the bleeding protrusion 117 is fixed by the bleeding groove 137.

An elastic bottom plate 150 formed of a thin sheet or film is interposed between the upper main body 110 and the lower main body 130. The elastic bottom plate 150 has a central region blocking the light transmitting hole 113, the peripheral region is sandwiched between the upper body portion 110 and the lower body portion 130 to form a bite holding portion. The bite retaining portion has a first bite region with a circumferential horizontal area of the light transmission hole 113 interposed between the first bottom flange portion 115 and the second bottom flange portion 135, and then the outer region is an upper side wall 119. ) Extends in the vertical direction along the lower side wall 139 and is then bent in the horizontal direction at the top of the lower side wall 139 to have a second engagement region. The elastic bottom plate 150 is penetrated by the pinch protrusion 117 in the upper region of the lower side wall 139 and is firmly fixed. Accordingly, the elastic bottom plate 150 is interposed between the

main body parts

110 and 130 and is prevented from being separated from each other by being bent in a crank shape a plurality of times.

In the present embodiment, the elastic bottom plate 150 is bent and retained by plural times between the upper body portion and the lower body portion, but there may be no bite or a bite retaining portion having one or two bent bite structures.

The elastic bottom plate 150 is made of a material having an elastic transparent sheet or film and, in some cases, may be installed in a state in which a plurality of sheets overlap. The elastic bottom plate 150 may be a thin glass having a thickness of 0.1 to 0.5mm in some cases. The elastic bottom plate 150 is preferably an acrylic plate, polycarbonate (PC), polyvinyl chloride (PVC), ethylene tetrafluoride (TFE), tetrafluoroethylene hexafluoropropylene (FEP), tetrafluoroethylene perfluoroalkoxy Ethylene (PFA), vinylideneprolide (ETFE), vinylprolide (PVF), chlorotrifluoroethylene (DTFE), ethylenechlorotrifluoroethylene (ECTFE), polyester (PE) or any of these Made of a mixture.

In addition, the elastic bottom plate 150 preferably coats the surface of the elastic bottom plate 150 in order to facilitate separation from the molding layer. The material for coating the elastic bottom plate 150 is teflon, polyester (PE), ethylene tetrafluoride (TFE), ethylene tetrafluoride hexafluoropropylene (FEP), ethylene tetrafluoride perfluoroalkoxy ethylene (PFA), vinyl Fluorine coatings such as leadenprolide (ETFE), vinylprolide (PVF), chlorotrifluoroethylene (DTFE), ethylenechlorotrifluoroethylene (ECTFE) and the like are possible. In addition, the anti-fingerprint coating for water repellent, anti-fingerprint coating for oil repellent, low reflection coating, can be coated using a release coating agent. The low reflection coating agent is preferably made of silicon dioxide (SiO ₂ ), zirconia (ZrO ₂ ), indium tin oxide, titanium dioxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ).

In some cases, a film layer (not shown) coated on the elastic bottom plate 150 may be laminated and used on an outer surface. Here, the upper surface of the film layer (not shown) is coated with at least one material of the above-described coating agent, it is preferable that the adhesive is applied to the back of the film layer (not shown) to be bonded to the elastic bottom plate 150. The film layer (not shown) may be laminated by connecting a plurality of tapes or a wide plate shape.

The resin bath support unit 170 is disposed below the resin bath main body 101 and is coupled to the resin bath main body 101 in the vertical direction. The resin bath support part 170 has a support rib 171 protruding upward along the edge of the light transmission hole 113 to contact the bottom surface of the elastic bottom plate 150. The support rib 171 contacts the elastic bottom plate 150 to support the elastic bottom plate 150. In addition, the resin supporting member 170 is preferably made of a glass plate of a transparent transparent material so that the image light irradiated from the light irradiation unit 300 passes.

In some cases, it is preferable that a reinforcement bottom plate (not shown) is disposed along the circumference of the support rib 171. The reinforcement bottom plate (not shown) is installed spaced apart from the elastic bottom plate 150 by a predetermined interval to facilitate elastic deformation of the elastic bottom plate 150. In some cases, the elastic bottom plate 150 may be installed to be in close contact with the lower portion of the elastic bottom plate to prevent sagging or to keep the elastic bottom plate 150 horizontal. In addition, the reinforcement bottom plate (not shown) is preferably made of a harder material than the elastic bottom plate 150 to reinforce the elastic bottom plate 150.

4 is a perspective view illustrating a coupling structure between the resin tank 100 and the frame unit 500. Referring to FIG. 4, the lower portion of the resin tank 100 is provided with a frame unit 500 that supports the resin tank 100. The frame unit 500 has an upper frame 510 coupled with the resin tank support 170, and a lower frame 530 supporting the upper frame 510. The upper frame 510 has sliding guide portions 511 disposed to face each other along the longitudinal direction of the upper frame 510 in order to couple and fix the resin tank support 170. The resin supporting member 170 is slidably coupled to the front and rear directions of the upper frame 510 to the sliding guide part 511. The upper frame 510 further includes a leaf spring 570 to more firmly couple the resin tank support 170. The leaf spring 570 is in close contact with one side of the resin tank support 170, and serves to elastically support the resin tank 100. This facilitates the coupling and separation of the resin tank support unit 170, it is possible to secure a firm position even in the external swing.

The lower frame 530 is installed below the upper frame 510. The lower frame 530 is coupled to the upper frame 510 by a predetermined bolt spaced apart from the predetermined frame, and the buffer spring 550 is interposed between the spaced spaces. The buffer spring 550 interposed between the upper frame 510 and the lower frame 530 reduces the vertical load applied when the elastic bottom plate 150 and the resin layer are separated during molding of the molding in the resin tank 100. By performing a buffer action to prevent damage to the resin tank (100). This improves the durability of the resin tank 100, it is possible to ensure the quality of the molded article.

Claims

In the 3D printing apparatus,

A resin bath body having a light transmitting hole at a bottom thereof and containing a photocurable resin, and an elastic bottom plate of a transparent elastic material blocking the light transmitting hole of the resin bath body;

A modeling plate unit having a bottom surface parallel to the elastic bottom plate and a modeling plate installed in the resin bath, and a modeling plate driving part for elevating and driving the modeling plate;

A light irradiation part for irradiating image light upward through the light transmission hole at the bottom of the resin tank;

It includes a control unit for controlling the modeling plate driving unit and the light irradiation unit,

The resin bath main body has a lower main body portion having the light transmitting hole, and an upper main body portion coupled to the lower main body portion to form a bite holding portion in which the elastic bottom plate is interposed between the lower main body portion. 3D printing device.
The method of claim 1,

The bite holding portion has a first biting area extending along the plate surface of the elastic bottom plate and a second biting area bent from the first biting area extending along the side wall of the resin bath body, 3D printing apparatus characterized in that .
The method of claim 1,

And the upper main body portion has a bleeding accommodating portion which receives the lower main body portion along the sidewall direction in at least a portion of the region.
The method of claim 1,

And a resin bath support unit disposed below the resin bath body and having a support rib protruding upward along the circumference of the light transmitting hole to contact the bottom surface of the elastic bottom plate.
The method of claim 1,

3D printing apparatus further comprises a reinforcing bottom plate for supporting the elastic bottom plate at the bottom of the elastic bottom plate.
The method of claim 1,

Further comprising a frame unit for supporting the resin tank,

The frame unit includes a top frame coupled to the resin support, a lower frame for supporting the upper frame, and a buffer spring interposed between the upper frame and the lower frame, characterized in that the 3D printing apparatus.
The method of claim 6,

The upper frame includes a sliding guide portion disposed to face each other along the longitudinal direction of the resin support,

3D printing apparatus, characterized in that the resin support is slidingly coupled in the front and rear direction through the sliding guide portion.
The method of claim 1,

The elastic bottom plate is thin glass, acrylic plate, polycarbonate (PC), polyvinyl chloride (PVC), ethylene tetrafluoride (TFE), ethylene tetrafluoride propylene (FEP), ethylene tetrafluoride perfluoroalkoxy ethylene ( Made of at least one of PFA), vinylideneprolide (ETFE), vinylprolide (PVF), chlorotrifluoroethylene (DTFE), ethylenechlorotrifluoroethylene (ECTFE) and polyester (PE) 3D printing apparatus, characterized in that.
The method of claim 1,

The elastic bottom plate is a 3D printing device, characterized in that it has a coating layer coated with at least one of a water-repellent anti-fingerprint coating, oil-repellent anti-fingerprint coating, a low reflection coating agent, a release coating agent.
The method of claim 9,

The coating layer is Teflon, polyester (PE), ethylene tetrafluoride (TFE), ethylene tetrafluoride propylene (FEP), ethylene tetrafluoride perfluoroalkoxyethylene (PFA), vinylideneprolide (ETFE), vinylprole 3D printing apparatus, comprising at least one of a material such as a slide (PVF), chlorotrifluoroethylene (DTFE), ethylene chlorotrifluoroethylene (ECTFE).
The method of claim 1,

Further comprising a film layer laminated on the surface of the elastic bottom plate,

3D printing apparatus, characterized in that the one surface of the film layer is coated with at least one material of water-repellent anti-fingerprint coating, oil-repellent anti-fingerprint coating, low-reflective coating, releasing coating.
The method of claim 11,

The film layer is Teflon, polyester (PE), ethylene tetrafluoride (TFE), ethylene tetrafluoride propylene (FEP), ethylene tetrafluoride perfluoroalkoxyethylene (PFA), vinylideneprolide (ETFE), vinyl 3D printing apparatus comprising at least one material of prolide (PVF), chlorotrifluoroethylene (DTFE), ethylene chlorotrifluoroethylene (ECTFE).