JP2016121402A - Three-dimensional molding device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional molding device and method, capable of reducing a molding cycle time, and reducing a use amount of atmosphere gas such as inert gas.SOLUTION: A three-dimensional molding device comprises: powder supply means 3 for supplying powder on a molding area P1; powder leveling means 4 for leveling the powder supplied from the powder supply means 3; light beam radiation means 5 which is disposed above the molding area P1 for radiating light beam L to the powder layer 13 for molding a molded article; and a molding bed 2. The device further comprises: moving means 6 for moving the light beam radiation means 5 to a three-dimensional direction; and a shroud 7 for moving with the light beam radiation means 5, and surrounding an upper space of the powder layer 13 around a radiation range of the light beam L by an area smaller than the molding area P1. The powder supply means 3 and the powder leveling means 4 move with the light beam radiation means 5, the shroud 7 comprises: an atmosphere gas supply port 19; and a fume suction port 20 disposed on a lower side closer to the powder layer relative to the atmosphere gas supply port 19.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a three-dimensional modeling apparatus and a three-dimensional modeling method for modeling powder by sintering with beam light.

  As a conventional three-dimensional modeling apparatus (SLM (Selective Laser Melting) apparatus), as in Patent Document 1, for example, a scanner that irradiates laser light above a modeling table (workpiece table in Patent Document 1) on which a model is placed. A structure provided with is known. In order to increase the modeling size, the scanner is generally attached to an XY drive shaft device (cross slide support in Patent Document 1) such as a gantry so as to be movable in the XY axis direction.

JP-T-2004-516166

  In the technique of Patent Document 1, the time for the powder supply process and the powder leveling process becomes long, and the molding cycle time tends to be long. Moreover, since it is the structure which fills the whole modeling space on a modeling table with the atmosphere of inert gas, the usage-amount of inert gas increases and modeling cost tends to increase.

  The present invention was created to solve the above-described problems, and a three-dimensional modeling apparatus capable of shortening the modeling cycle time and the amount of atmospheric gas such as inert gas can be reduced, and An object is to provide a three-dimensional modeling method.

  In order to solve the above problems, the present invention provides a powder supply means for supplying powder onto a modeling area, and a powder leveling means for forming a powder layer by leveling the powder supplied from the powder supply means. And a light beam irradiation means disposed above the modeling area and irradiating the powder layer with a light beam to sinter or melt and solidify the powder to form a modeled object, and above the modeling area. A three-dimensional modeling apparatus comprising: a space and a space in a relief area for escaping the powder supply means that is out of the modeling area, wherein the light beam irradiation means is three-dimensional Moving means for moving in the direction, and a cover that moves integrally with the light beam irradiation means and covers the upper space of the powder layer around the irradiation of the light beam in a region smaller than the modeling area, The supply means and the powder leveling means include the cover An atmosphere gas supply port for supplying an atmosphere gas to the inside of the cover and a powder than the atmosphere gas supply port is disposed near the forward direction and moves integrally with the light beam irradiation means. A fume suction port for sucking fumes generated inside the cover is formed below the layer.

According to this three-dimensional modeling apparatus, the following effects are exhibited.
(1) The modeling size of the modeled object can be easily enlarged according to the movable range in the three-dimensional direction of the moving unit that holds the light beam irradiation unit.
(2) Since the powder supply unit and the powder leveling unit are integrated with the light beam irradiation unit, the powder layer can be formed when the light beam irradiation unit is moved, so that the modeling cycle time can be shortened.

  (3) Since the powder supply means and the powder leveling means are integrated with the light beam irradiation means, a driving source for individually operating the powder supply means and the powder leveling means becomes unnecessary. Can be made compact.

  (4) Since the atmospheric gas has only to be supplied to the inside of the cover that covers the powder layer in a region smaller than the modeling area, the amount of atmospheric gas used can be reduced.

  (5) Since the light beam irradiation means, the powder supply means and the powder leveling means are integrated, the powder formed by the light beam irradiation means, the powder supply means and the powder leveling means. The dimensional accuracy between the surface of the body layer is increased. Therefore, the focus of the light beam in the powder layer is stabilized, and the modeling accuracy is improved.

  (6) It becomes possible to form a model by irradiating the light beam while moving the light beam irradiation unit by the moving unit, and the modeling cycle time can be further shortened.

  According to this three-dimensional modeling apparatus, the powder supply means and the powder leveling means are arranged in the forward direction of the cover, so that the powder supply means and the powder leveling means can be covered with a simple structure. Can be integrated.

  According to this three-dimensional modeling apparatus, the atmospheric gas can be easily supplied to the inside of the cover, and the fume can be discharged to the outside.

  In the present invention, the powder supply means includes a powder storage tank having a powder drop port formed in a lower portion thereof, and the powder leveling means is provided between the powder storage tank and the cover. It is characterized by comprising blades arranged.

  According to this three-dimensional modeling apparatus, the powder supply means is a powder storage tank having a powder drop port formed in the lower part, so that the powder supply means can be configured with a simple structure member, Easy to install.

  Further, according to the present invention, the cover is provided with a skirt member that can move up and down and closes a gap formed between the lower end of the cover and the powder layer when the cover is lowered. Features.

  According to this three-dimensional modeling apparatus, it is possible to effectively prevent leakage of atmospheric gas from the gap formed between the lower end of the cover and the powder layer.

  The present invention also provides a powder supply means for supplying powder onto a modeling area, a powder leveling means for leveling the powder supplied from the powder supply means to form a powder layer, and a modeling Light beam irradiation means arranged above the area and irradiating the powder layer with a light beam to sinter or melt and solidify the powder to form a model, and light beam irradiation in an area smaller than the modeling area A cover that covers the upper space of the surrounding powder layer, and is configured to be integrally movable in the three-dimensional direction, and the cover includes an atmospheric gas supply port for supplying atmospheric gas to the inside of the cover; Positioned below the powder layer from the atmosphere gas supply port, forming a fume suction port for sucking fumes generated inside the cover, moving the cover in the lateral direction, and moving distance thereof The powder is supplied by the powder supply means for A powder layer forming step of supplying powder below the powder and leveling the powder by the powder leveling means, and irradiating the powder layer leveled in the powder layer forming step with a light beam to form a model And performing a three-dimensional modeling by repeatedly performing the modeling process for one layer by raising the cover. It is characterized by that.

  According to this three-dimensional modeling method, the same effects as the above (1) to (5) are exhibited.

  Further, the present invention is characterized in that the temporary wall body surrounding the modeled object is three-dimensionally modeled so that the powder around the modeled object to be modeled does not collapse.

  According to this three-dimensional modeling method, the temporary wall can prevent the powder around the modeled object from collapsing.

  According to the present invention, it is possible to shorten the modeling cycle time and reduce the use amount of an atmospheric gas such as an inert gas.

It is a side view of the three-dimensional modeling apparatus which concerns on this invention. It is an external appearance perspective view of the main components of the three-dimensional modeling apparatus which concerns on this invention. It is operation | movement explanatory drawing of the three-dimensional modeling apparatus which concerns on this invention. It is operation | movement explanatory drawing of the three-dimensional modeling apparatus which concerns on this invention. It is operation | movement explanatory drawing of the three-dimensional modeling apparatus which concerns on this invention. It is a side view of the three-dimensional modeling apparatus when a temporary wall body is provided. It is a side view which shows the modification structural example of the opening / closing door of a storage tank.

  In FIG. 1, the three-dimensional modeling apparatus 1 according to the present embodiment is supplied from a modeling bed 2, a powder supply unit 3 that supplies powder onto the modeling area P <b> 1 of the modeling bed 2, and a powder supply unit 3. The powder leveling means 4 for leveling the ground powder to form the powder layer 13 is disposed above the modeling area P1, and the powder is burned by irradiating the leveled powder layer 13 with the light beam L. Light beam irradiating means 5 for shaping a modeled object by linking or melting and solidifying, moving means 6 for moving the light beam irradiating means 5 in a three-dimensional direction, and around the irradiation of the light beam L in an area smaller than the modeling area P1 A cover (hereinafter referred to as a shroud) 7 that covers the space above the powder layer 13 and a control unit 8 are mainly provided. The shroud 7, the powder supply means 3, and the powder leveling means 4 move together with the light beam irradiation means 5.

"Modeling bed 2"
The modeling bed 2 is a plate-like member that is horizontally disposed inside the apparatus housing 9 formed in a square box shape, for example, and is fixed to the apparatus housing 9. Below the modeling bed 2, a carriage 10 that collects residual powder is disposed. For example, the residual powder generated on the modeling bed 2 is collected by the carriage 10 via a discharge path (not shown) that penetrates the modeling bed 2 up and down. A modeling object placing plate 11 is detachably fitted to a part of the upper surface of the modeling bed 2 so as to be flush with the modeling bed 2. The modeled object is formed in the upper part of the modeled object mounting plate 11, and the upper space of the modeled object mounting plate 11 constitutes the modeling area P1.

"Light beam irradiation means 5"
The light beam irradiation means 5 includes a light beam irradiation unit 12 that irradiates a light beam L such as a laser beam. The light beam irradiation unit 12 includes a lens, a mirror, and the like, and the irradiation range of the light beam L can be moved by a predetermined distance in a horizontal range (XY axis range).

"Moving means 6"
As shown in FIGS. 1 and 2, the moving means 6 includes a pair of fixed guide rails 14 attached to the apparatus housing 9, and a pair of fixed guide rails 14, and a drive source (not shown) drives the Y-axis direction. A movable guide rail 15 that moves in the direction of the X axis along a movable guide rail 15 attached to the movable guide rail 15 by a drive source (not shown), and a Z-axis relative to the base 16 by a drive source (not shown). And a vertical column member 17 that moves in the direction. The light beam irradiation unit 12 is attached to the lower end of the support member 17. With the above structure, the moving means 6 enables the light beam irradiation unit 12 to move in a three-dimensional direction.

"Shroud 7"
The shroud 7 is formed of a hollow cover member having an opening formed at the lower end. Although shown as a quadrangular member in FIG. 2, other shapes such as a cylindrical shape may be used. The upper part of the shroud 7 is integrally attached to the lower end of the light beam irradiation unit 12 so as not to interfere with the irradiation range of the light beam L. The opening area of the lower end of the shroud 7 is formed smaller than the area of the modeling area P1. Around the lower end of the shroud 7, there is provided a skirt member 18 that can move up and down and closes a gap C formed between the lower end of the shroud 7 and the powder layer 13 when lowered. The skirt member 18 is a frame-like member that follows the shape of the side surface of the shroud 7, and is moved up and down by a driving source such as a motor attached to the shroud 7.

The shroud 7 includes an atmosphere gas supply port 19 for supplying N ₂ gas as an atmosphere gas into the shroud 7 and a fume suction port 20 for sucking fumes generated inside the shroud 7. Is formed. The atmospheric gas supply port 19 and the fume suction port 20 are connected to an N ₂ gas supply device 21 and a fume suction device 22 installed outside the apparatus housing 9 via flexible hoses 31 and 32, respectively. .

"Powder supply means 3"
In FIG. 1, the powder supply means 3 comprises a powder storage tank 23 having a powder drop port 24 formed in the lower part. The powder storage tank 23 has, for example, a funnel shape having a hopper portion whose plane cross-sectional area becomes narrower toward the powder dropping port 24, and an upper part is formed as an opening for filling powder. The powder is, for example, a metal powder having a particle size of several to several tens of μm. An open / close door 25 for opening and closing the powder drop opening 24 is attached to the powder storage tank 23. The open / close door 25 is slid laterally by a driving source such as a motor (not shown) attached to the powder storage tank 23 to open and close the powder drop opening 24. The powder storage tank 23 is attached to the shroud 7 by a bracket 26 so as to be positioned closer to the forward direction of the shroud 7 (right direction in FIG. 1).

"Powder leveling means 4"
The powder leveling means 4 is composed of, for example, a rectangular flat blade 27. The blade 27 is arranged between the powder storage tank 23 and the shroud 7 so that the plate surface thereof is substantially along the vertical direction, and the powder is leveled by the lower edge of the long side arranged horizontally. A powder layer 13 is formed. As shown in FIG. 1, the blade 27 is attached to the outer surface of the powder storage tank 23 by screwing or the like, or is attached to the outer surface of the shroud 7 by screwing or the like. The lower edge of the blade 27 is located below the position of the powder drop port 24 of the powder storage tank 23 and the lower end position of the shroud 7.

"Control unit 8"
The control unit 8 is composed of a CPU and the like, and is disposed outside the apparatus housing 9, for example. The control unit 8 controls the laser light oscillator 29, the N ₂ gas supply device 21, the fume suction device 22, and the like based on a command from the operation terminal device 28 such as a PC. The light beam irradiation unit 12 is connected to a laser light oscillator 29 through an optical fiber cable 30.

“Explanation of the operation of the 3D modeling apparatus 1”
An example of the operation of the three-dimensional modeling apparatus 1 having the above configuration will be described. FIG. 3A shows a state before the modeling operation is started, and the shroud 7 is located in the standby area P2 formed on one end side of the modeling area P1. The powder drop port 24 of the powder storage tank 23 is closed by an open / close door 25, and the skirt member 18 of the shroud 7 is raised. The other end side of the modeling area P1 is formed as a relief area P3 of the powder storage tank 23.

From the state of FIG. 3A, the opening / closing door 25 is opened, and the shroud 7 is moved forward by the moving means 6 toward the modeling area P1, so that the powder falls in the powder storage tank 23 by the moving distance. It is supplied onto the modeling object placing plate 11 from the mouth 24, and is leveled by the blade 27 and formed as a part of the powder layer 13 in one layer below the shroud 7 (FIG. 3B). This process is referred to as “powder layer forming process”. Incidentally, by moving the start and around the shroud 7 supplies the N ₂ gas within the shroud 7 by the N ₂ gas supply unit 21, and by operating the fume suction device 22 to circulate the atmosphere within the shroud 7.

Next, in order to prevent leakage of N ₂ gas from the gap C formed between the lower end of the shroud 7 and the powder layer 13, the skirt member 18 descends as shown in FIG. Block. If the gap C is formed with a small size and the amount of leakage of N ₂ gas is negligible, the skirt member 18 need not be provided. Alternatively, the gap C may be closed by lowering the support member 17 of the moving means 6 without providing the skirt member 18, that is, by lowering the shroud 7 itself.

  Next, the light beam L is irradiated from the light beam irradiation unit 12 to the powder layer 13 that has been leveled in the powder layer forming process, and a part of the model W is modeled. This is referred to as a “modeling process”. The fumes generated during the modeling are discharged from the fume suction port 20 by the fume suction device 22.

  After completion of the modeling process, the skirt member 18 is raised, and the shroud 7 is moved forward again by the moving means 6, so that the modeling object W is now modeled on the forward direction side (the right side in FIG. 4A). The amount of powder to be supplied is supplied from the powder drop port 24 of the powder storage tank 23, and is leveled by the blade 27 to form the powder layer 13 (state shown in FIG. 4A). Then, the skirt member 18 descends and the light beam L is irradiated onto the powder layer 13 from the light beam irradiating unit 12 so that it continues to a part of the shaped object W in FIG. Is formed (FIG. 4B). As described above, the powder layer forming process and the modeling process are performed a plurality of times, so that the modeling object W for one layer of the powder layer 13 is modeled as shown in FIG. The process of forming a layer of the powder layer 13 by performing the powder layer forming process and the modeling process a plurality of times is referred to as a “single layer modeling process”.

When the "one-layer modeling process" is completed, the powder drop port 24 of the powder storage tank 23 is closed by the open / close door 25, and the support member 17 is raised by the moving means 6 by the thickness of the powder layer 13 to be formed next. Then, the shroud 7 moves backward to the standby area P2 (FIG. 5A). Then, the second powder layer 13 is formed on the already formed first powder layer 13 and the one-step modeling process shown in FIGS. 3 and 4 is performed again. By repeating the modeling process for one layer in this way, the modeling of the entire model W is completed as shown in FIG. Note that the time during which the shroud 7 is located in the standby area P2 is very short, and the amount of N ₂ gas leaking from the lower end of the shroud 7 at that time is a slight amount. In some cases, when the shroud 7 is located in the standby area P2, the supply of N ₂ gas may be stopped.

  In addition, as shown in FIG. 6, the temporary wall 33 that surrounds the modeled object W is also modeled in the three-dimensional modeling process and is three-dimensionally modeled. The wall 33 can prevent the powder around the model W from collapsing.

  As described above, the moving unit 6 that moves the light beam irradiation unit 12 (light beam irradiation unit 5) in the three-dimensional direction and the light beam irradiation unit 12 move integrally with the light beam in an area smaller than the modeling area P1. A shroud 7 covering the space above the powder layer 13 around the irradiation of L, a powder storage tank 23 (powder supply means 3) and a blade 27 (powder leveling means 4) that move integrally with the light beam irradiation unit 12. ), The following effects are achieved.

(1) The modeling size of the modeled object W can be easily enlarged according to the movable range of the moving unit 6 holding the light beam irradiation unit 5 in the three-dimensional direction.
(2) Since the powder supply means 3 and the powder leveling means 4 are integrated with the light beam irradiation means 5, the powder layer 13 can be formed when the light beam irradiation means 5 is moved. Can be shortened.
(3) A drive source for individually operating the powder supply means 3 and the powder leveling means 4 by integrating the powder supply means 3 and the powder leveling means 4 with the light beam irradiation means 5. Is unnecessary, and the apparatus can be made compact.
(4) Since the atmospheric gas has only to be supplied to the inside of the shroud 7 that covers the powder layer 13 in a region smaller than the modeling area P1, the amount of atmospheric gas used can be reduced.
(5) Since the light beam irradiation means 5, the powder supply means 3 and the powder leveling means 4 are integrated, the light beam irradiation means 5, the powder supply means 3 and the powder leveling means. The dimensional accuracy between the surface of the powder layer 13 formed by 4 increases. Therefore, the focus of the light beam L in the powder layer 13 is stabilized, and the modeling accuracy is improved.
(6) It is possible to form the model W by irradiating the light beam L while moving the light beam irradiation unit 5 by the moving unit 6, and the modeling cycle time can be further shortened.

  Further, if the powder supply means 3 and the powder leveling means 4 are arranged close to the advancing direction of the shroud 7, the powder supply means 3 and the powder leveling means 4 have a simple structure with respect to the shroud 7. Can be integrated.

  Further, the powder supply means 3 is composed of a powder storage tank 23 having a powder drop port 24 formed in the lower part, and the powder leveling means 4 is arranged between the powder storage tank 23 and the shroud 7. If constituted by the blade 27, the powder supply means 3 and the powder leveling means 4 can be constituted by members having a simple structure and can be easily attached to the shroud 7.

  Furthermore, if an open / close door 25 that opens and closes the powder drop port 24 of the powder storage tank 23 is provided, the discharge of the powder from the powder storage tank 23 can be easily controlled by the opening / closing operation of the open / close door 25. By forming the atmosphere gas supply port 19 and the fume suction port 20 in the shroud 7, the atmosphere gas can be easily supplied to the inside of the shroud 7 and the fumes can be discharged to the outside. By providing the skirt member 18 on the shroud 7, it is possible to effectively prevent leakage of atmospheric gas from the gap C formed between the shroud 7 and the powder layer 13.

  The preferred embodiment of the present invention has been described above. A blade 27 can be used as the open / close door 25 that opens and closes the powder drop opening 24 of the powder storage tank 23. As shown in FIG. 7, a support shaft 34 is formed on the outer surface of the powder storage tank 23, and a blade 27 is provided so as to be rotatable around the support shaft 34. Reference numeral 35 denotes a drive source such as a motor that rotates the blade 27, and is attached to the outer surface of the powder storage tank 23, for example. As shown in FIG. 7A, the blade 27 closes the powder drop port 24 of the powder storage tank 23 in a state of being horizontally positioned, and the blade 27 rotates around the support shaft 34 by the drive of the drive source 35. As a result of the vertical positioning, the powder drop opening 24 is opened and the powder is dropped and discharged, and the powder is leveled by the lower end of the blade 27. According to this structure, the blade 27 can have both a powder leveling function and a powder drop opening 24 opening / closing function, and the structure of the powder supply means 3 and the powder leveling means 4 is simplified. Can be

DESCRIPTION OF SYMBOLS 1 3D modeling apparatus 2 Modeling bed 3 Powder supply means 4 Powder leveling means 5 Light beam irradiation means 6 Moving means 7 Shroud (cover)
8 Control part 11 Modeling object mounting plate 12 Light beam irradiation part (light beam irradiation means)
13 Powder layer 18 Skirt member 19 Atmospheric gas supply port 20 Fume suction port 23 Powder storage tank (powder supply means)
24 Powder drop opening 25 Open / close door 27 Blade (powder leveling means)
33 Temporary wall C Clearance L Light beam P1 Modeling area

Claims (5)

Powder supply means for supplying powder onto the modeling area;
Powder leveling means for leveling the powder supplied from the powder supply means to form a powder layer;
A light beam irradiating means arranged above the modeling area, and irradiating the powder layer with a light beam to sinter or melt and solidify the powder to form a modeled object;
Above, the modeling bed in which the space of the modeling area and the space of the escape area for escaping the powder supply means outside the modeling area are formed,
A three-dimensional modeling apparatus comprising:
Moving means for moving the light beam irradiation means in a three-dimensional direction;
A cover that moves integrally with the light beam irradiation means and covers the upper space of the powder layer around the irradiation of the light beam in an area smaller than the modeling area;
With
The powder supply means and the powder leveling means are arranged closer to the forward direction of the cover and move integrally with the light beam irradiation means,
The cover is provided with an atmospheric gas supply port for supplying atmospheric gas to the inside of the cover, and is located below the powder layer from the atmospheric gas supply port and sucks fumes generated in the cover. A three-dimensional modeling apparatus characterized in that a fume suction port is formed. The powder supply means comprises a powder storage tank having a powder drop port formed in the lower part,
The three-dimensional modeling apparatus according to claim 1, wherein the powder leveling means includes a blade disposed between the powder storage tank and the cover.   2. The cover is provided with a skirt member that can move up and down and closes a gap formed between a lower end of the cover and a powder layer when the cover is lowered. Or the three-dimensional modeling apparatus of Claim 2. Powder supply means for supplying powder onto the modeling area;
Powder leveling means for leveling the powder supplied from the powder supply means to form a powder layer;
A light beam irradiating means arranged above the modeling area, and irradiating the powder layer with a light beam to sinter or melt and solidify the powder to form a modeled object;
A cover that covers the upper space of the powder layer around the irradiation of the light beam in an area smaller than the modeling area;
Is configured to be movable in three dimensions,
The cover is provided with an atmospheric gas supply port for supplying atmospheric gas to the inside of the cover, and is located below the powder layer from the atmospheric gas supply port and sucks fumes generated in the cover. To form a fume suction port for
A process of moving the cover in the lateral direction, and a powder layer forming step of supplying the powder below the cover by the powder supply means by the moving distance and leveling the powder by the powder leveling means; There is a one-step modeling process in which a powder layer is formed by performing a modeling process in which the powder layer leveled in the powder layer forming process is irradiated with a light beam to model a model. And
A three-dimensional modeling method characterized by performing three-dimensional modeling by raising the cover and repeating the modeling process for one layer.   The three-dimensional modeling method according to claim 4, wherein the temporary wall body surrounding the modeled object is three-dimensionally modeled so that the powder around the modeled object to be modeled does not collapse.

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