KR20190019540A - Three-dimensional object - Google Patents

Abstract

According to the present invention, provided is a three-dimensional printer which comprises: a chamber in which an inner space is formed; a work table installed inside the chamber so as to be slidable up and down and allows supplied powder to be sequentially stacked in a form of powder layers so to be deposited into a product to be manufactured; and a powder supply part supplying powder to an upper portion of the work table, wherein the outer wall of a bed is formed in a bellows shape. The three-dimensional printer according to the present invention has an effect of preventing the powder from falling down below the work table.

Description

A three-dimensional printer

The present invention relates to a three-dimensional printer.

[0003] Referring to the background art described in Korean Patent No. 1705696, a printer generally refers to a device that prints letters, figures, etc. on a print object. Printer devices that are connected to a computer and print on the paper are widely used for business, .

Generally, as a three-dimensional printer, a device that creates a real model as if it prints three-dimensional machine parts in a computer file designed by a CAD program is called a three-dimensional printer.

In the three-dimensional printer method, SLA (Stereo Lithographic Apparatus) which uses the principle that a scanned portion is cured by injecting a laser beam to a photo-curing resin and a functional polymer or metal powder are used in place of the photo- SLS (Selective Laser Sintering) using the principle of solidification and molding, Laminated Object Manufacturing (LOM) in which the adhesive-coated paper is cut by a laser beam in a desired cross section and laminated to form a layer, And Ballistic Particle Manufacturing (BPM) using Ink-Jet printer technology. Laser-based methods were developed at the University of Texas at UOT in Austin, USA in the early 1980's / early 1990's and are known as 3D printing or selective laser sintering.

SLS technology has enabled the direct production of three-dimensional articles with high resolution and dimensional accuracy from a variety of powder materials including conventional polymer powders. Selective Laser Sintering (SLS) is described in U.S. Patent No. 4,863,568, which is incorporated herein by reference in its entirety. Selective laser sintering was commercialized by DTM Corporation. Selective laser sintering involves spreading a thin layer of powder on a flat surface.

The powder is spread on a worktable using a tool developed for use in a selective laser sintering process known in the art as a counter-rolling mechanism or a counter-roller. Continuous powder layers are sieved on a layer that has already been formed using a counter-roller and then sintered or melted with a laser. After the powder layer is deposited on the surface, the laser energy is applied to the powder in a predetermined two-dimensional pattern using a laser. The laser sinter or melt the powder together in the region where the laser beam energy impinges. The powder may be a plastic, a metal, a polymer, a ceramic or a composite.

However, in the case of a three-dimensional printer using such a powder as a material, the movement of the workbench during the three-dimensional solid molding process and the powder material scattered during the molding process are dropped to the lower side of the workbench,

When falling, the powder is accumulated in the gap between workpieces,

The operation of the work table is unstable due to the accumulated powder, the work table is not flat and the precision of the product to be formed is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-dimensional printer capable of preventing powder from accumulating below a workbench or between a workbench and a workbench case.

According to an aspect of the present invention, there is provided a plasma display apparatus comprising: a chamber having an internal space; A work table installed inside the chamber, the work table having a plurality of powder layers sequentially stacked; And a compression unit installed along the work table and compressing the work table.

The work table may include a bed on which powder is stacked on top, and an outer wall part integrally coupled to the bed and having a bellows shape vertically installed along the periphery of the bed.

The compression unit may include a compression bar for compressing the outer wall part, a coupling part for coupling the compression bar to one side of the bed, and a driving unit for compressively moving the compression bar to the outer wall part.

The compression bar may be formed with an insertion groove to be inserted so that the driving part is not exposed to the outside when the compression bar is compressed to the outer wall part.

The three-dimensional printer according to the present invention has the effect of preventing the powder from falling down below the work bench.

Further, when the powder falls down below the work table, the powder can be prevented from accumulating in the work table gap.

Further, when the work table is moved up and down, it has an effect that it is possible to prevent the work table from being safely moved or asymmetrically operated by the accumulated powder.

Further, the powder accumulated on the work table can be recycled.

Thus, the molded product is manufactured in a desired shape, thereby improving the molding accuracy.

1 illustrates a three-dimensional printer according to an embodiment of the present invention,
FIG. 2 is a view showing a work table of the three-dimensional printer shown in FIG. 1,
FIG. 3 is a view showing a state in which the work table shown in FIG. 2 is expanded by the compression unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

FIG. 1 is a view showing a three-dimensional printer according to an embodiment of the present invention, FIG. 2 is a view showing a work table of the three-dimensional printer shown in FIG. 1, Fig.

Referring to FIGS. 1 to 3, a three-dimensional printer according to an embodiment of the present invention includes a chamber 100, a work table 200, and a compression unit 300.

In the chamber 100, an inner space is formed.

The work table 200 is installed inside the chamber 100, and the powders are sequentially stacked with a plurality of powder layers. The work table 200 may also include a bed 210 and an outer wall 220. Here, the bed 210 may have powder deposited thereon. That is, the powder layer may be sequentially deposited on the bed 210 and may be deposited as a product to be manufactured. In addition, a piston 212 is installed below the bed 210. The piston 212 can move vertically in the z-axis direction. When the powder material placed on the upper surface of the bed 210 is sintered by the laser installed on the upper portion of the bed 210 and is vertically lowered by the piston 212 to be sintered, So that the new powder material can be laminated to a certain thickness. At this time, the work table 200 formed by the bellows is folded when the piston 212 moves upwards to the vertically upward direction of the bed 210, and is expanded when the piston 212 moves to the vertical downward direction. And may be vertically installed along the periphery of the bed 210. The outer wall 220 may be formed of a bellows.

The compression unit 300 is installed along the work table 200. The work table 200 compresses the work table 200. The compression unit 300 may include a compression bar 310, a coupling unit 320, and a driving unit 330. Here, the compression bar 310 can compress the outer wall 220. The compression bar 310 may be inserted into the insertion groove 312 formed at the lower end of the compression bar 310 so that the driving unit 330 is not exposed to the outside when the compression bar 310 is compressed by the outer wall 220. That is, when the compression bar 310 comes into contact with the outer wall 220, the driving part 330 is inserted into the insertion groove 312 and is not exposed to the outside. The coupling part 320 may be coupled to one side of the compression bar 310 and the bed 210. The coupling structure of the coupling portion 320 may be screwed with reference to FIG. However, this is only an example. The driving unit 330 may be installed to compressively move the compression bar 310 to the outer wall 220. The driving unit 330 may be operated by a motor (not shown).

On the other hand, the powder supply part 110 and the like are located in the inner space of the chamber 100. The powder feeder 110 is located adjacent to the bed 210. The powder supply unit 110 may further include a powder storage unit 112 that forms a powder layer on the top of the bed 210 and stores the remaining powder.

The powder supply part 110 is preferably arranged in line with the bed 210 together with the powder storage part 112. The nose is moved from the powder feeder 110 to the bed 210 and the powder layer is formed flat on the bed 210 so that the cotter 114 moves from the bed 210 to the powder feeder 110 A powder layer is formed on the bed 210, and the remaining powder is stored while being transferred to the powder storage part 112.

The cotter 114 preferably includes a separate moving member (not shown) and a vacuum member (not shown). The moving member (not shown) serves to move the coater 114 from the upper part of the bed 210 to the left and right and the vacuum member (not shown) causes the coater 114 to move the powder stored in the powder supplying part 110 And discharges it to the upper portion of the bed 210 after the suction.

The powder supply part 110 and the powder storage part 112 are connected to a separate lifting mechanism 116 to move up and down in the chamber 100 by the operation of the lifting mechanism 116, . Since the lifting mechanism 116 is controlled by a control unit (not shown), the lifting and lowering of the bed 210 is controlled by a control unit (not shown).

The work table 200 and the compression unit 300 are also applicable to the powder supply unit 110 and the powder storage unit 112.

As described above, according to the three-dimensional printer of the present invention, the three-dimensional printer according to the present invention has the effect of preventing the powder from falling down below the workbench.

Further, when the powder falls down below the work table 200, the powder can be prevented from accumulating in the gap between the work tables 200.

Further, when the work table 200 is moved up and down, it has the effect of preventing the work table from being safely moved or asymmetrically operated by the accumulated powder.

Further, the powder accumulated in the work table 200 can be recycled.

Thus, the molded product is manufactured in a desired shape, thereby improving the molding accuracy.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: chamber
110: Powder supply part
112: powder storage part
114: Coater machine
116: lifting mechanism
200: Work table
210: Bed
212: piston
220: outer wall portion
300:
310: Compression bar
312: insertion groove
320:
330:

Claims (4)

A chamber provided with an internal space;
A work table installed inside the chamber, the work table having a plurality of powder layers sequentially stacked; And
And a compression unit installed along the work table to compress the work table.
The method according to claim 1,
The work table includes:
A bed on which the powder is stacked,
And an outer wall integrally coupled to the bed and having a bellows shape vertically installed along the periphery of the bed.
The method of claim 2,
Wherein the compression unit comprises:
A compression bar for compressing the outer wall portion,
A compression bar, a coupling part coupled to one side of the bed,
And a driving unit for pressingly moving the compression bar to the outer wall.
The method of claim 3,
Wherein the compression bar comprises:
Wherein the insertion groove is formed such that the driving part is not exposed to the outside when the pressing part is compressed to the outer wall part.

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