JP7508992B2 - 3D modeling equipment - Google Patents

Description

The present invention relates to a three-dimensional printing device that prints three-dimensional objects.

Conventionally, as a three-dimensional modeling device, a device equipped with a nozzle that sprays inert gas into a chamber is known, as described in JP 2020-015931 A, for example. This device sprays inert gas from a nozzle, and aims to eliminate fumes generated by beam irradiation using this inert gas. If fumes adhere to the cover glass (window portion) for beam incidence, the desired beam cannot be irradiated, causing problems in the modeling of an object.

JP 2020-015931 A

In such three-dimensional printing devices, it is difficult to adequately protect the cover glass from fumes. For example, in order to reliably remove a large amount of fumes, it is possible to increase the flow rate of the sprayed inert gas. However, while increasing the flow rate of the inert gas can remove the fumes sprayed with the inert gas, the fumes are caught in the fast flow of inert gas, attracting new fumes. As a result, there is a risk that the fumes will adhere to the cover glass, making it impossible to properly print an object.

Therefore, there is a need to develop a three-dimensional printing device that can suppress the effects of fumes and properly print objects.

A three-dimensional printing apparatus according to one aspect of the present disclosure is a three-dimensional printing apparatus that irradiates a printing material in a chamber with an energy beam to melt and laminate the printing material to form a three-dimensional object, and includes a beam emission unit that emits an energy beam and causes the energy beam to enter the chamber through a cover glass to irradiate the printing material with the energy beam, a first gas supply unit that is provided in the chamber and supplies an inert gas to the periphery of the printing material, and a second gas supply unit that is provided in the chamber and installed above the first gas supply unit and supplies an inert gas to the periphery of the cover glass, and the flow rate of the inert gas ejected from the second gas supply unit is set slower than the flow rate of the inert gas ejected from the first gas supply unit. According to this three-dimensional printing apparatus, by making the flow rate of the inert gas ejected from the second gas supply unit slower than the flow rate of the inert gas ejected from the first gas supply unit, it is possible to prevent fumes generated by beam irradiation from being caught in the flow of the inert gas ejected from the second gas supply unit and flowing toward the cover glass. This allows the cover glass to be adequately protected by the inert gas ejected from the second gas supply unit.

In addition, in the three-dimensional printing apparatus according to one aspect of the present disclosure, the first gas supply unit and the second gas supply unit may spray the inert gas in a direction intersecting the irradiation direction of the energy beam. In this case, by the first gas supply unit and the second gas supply unit spraying the inert gas in a direction intersecting the irradiation direction of the energy beam, fumes generated by the irradiation of the energy beam can be diverted to the side.

In addition, in the three-dimensional modeling apparatus according to one aspect of the present disclosure, the second gas supply unit may have a tank for storing the inert gas and a deceleration member provided downstream of the tank for decelerating the flow rate of the inert gas, and an outlet for ejecting the inert gas may be formed downstream of the deceleration member. In this case, by having a deceleration member for decelerating the flow rate of the inert gas, the inert gas sent to the tank can be decelerated and ejected from the outlet. Therefore, even if the outlet is made large, the flow rate of the inert gas does not become too large, and the inert gas can be supplied in a wide range in the height direction. This allows the cover glass to be adequately protected from fumes.

In addition, in the three-dimensional modeling apparatus according to one aspect of the present disclosure, the flow rate of the inert gas ejected from the second gas supply unit may be 0.1 to 0.2 m/s. In this case, by setting the flow rate of the inert gas ejected from the second gas supply unit to 0.1 to 0.2 m/s, the inert gas can be made to flow gently. This makes it possible to prevent fumes from being caught in the flow of the inert gas ejected from the second gas supply unit and flowing toward the cover glass. Therefore, the cover glass can be adequately protected by the inert gas ejected from the second gas supply unit.

The disclosed invention makes it possible to suppress the effects of fumes and properly shape objects.

FIG. 1 is a schematic diagram illustrating a configuration of a three-dimensional printing apparatus according to an embodiment of the present disclosure. FIG. 2 is an enlarged cross-sectional view of a second gas supply unit in the three-dimensional modeling apparatus of FIG. 1 . FIG. 2 is a perspective view of a second gas supply unit in the three-dimensional modeling apparatus of FIG. 1 . FIG. 2 is a diagram showing a modification of the three-dimensional modeling apparatus of FIG. 1 .

Embodiments of the present disclosure will be described below with reference to the drawings. Note that in the description of the drawings, the same elements are given the same reference numerals, and duplicate descriptions will be omitted.

Figure 1 is a schematic diagram of a three-dimensional modeling device according to an embodiment of the present disclosure. The three-dimensional modeling device 1 is a device that forms a three-dimensional object by irradiating a powder material A with a laser beam B to melt and stack the powder material A. This three-dimensional modeling device 1 is a device that uses powder bed fusion (PBF) and forms an object by laser beam melting (LBM) using a laser beam B as an energy beam. The powder material A is a modeling material for forming an object and is composed of a large number of powder bodies. For example, a metal powder is used as the powder material A. In addition, as the powder material A, a granular body with a larger particle size than the powder may be used as long as it can be melted and solidified by irradiation with a laser beam B. The laser beam B is an energy beam for melting the powder material A.

The three-dimensional modeling device 1 includes a beam emitting unit 2, a first gas supply unit 3, and a second gas supply unit 4. The beam emitting unit 2 emits a laser beam B to the powder material A in the chamber 11 to melt the powder material A. The laser beam B is a beam formed by laser light. For example, the beam emitting unit 2 irradiates the powder material A with the laser beam B to melt the powder material A to model a three-dimensional object. The beam emitting unit 2 is provided outside the chamber 11, for example, above the chamber 11. The chamber 11 is a box that forms a space for modeling an object. A table 12 is provided at the bottom of the chamber 11, and the object is modeled above the table 12. For example, the table 12 is attached to a base table 15 arranged in the chamber 11 and is provided so as to be movable up and down. The powder material A is spread evenly on the table 12, and the powder material A is irradiated with the laser beam B to melt and solidify the powder material A. Then, the table 12 is moved downward, and the powder material A is spread evenly and the laser beam B is irradiated again. By repeating this process, an object is layer-by-layer manufactured. Note that in FIG. 1, the movement mechanism of the table 12, the tank that stores the powder material A, and the recoater that spreads the powder material A evenly are not shown. The movement mechanism, tank, and recoater can be publicly known mechanisms and devices.

The beam emission unit 2 has, for example, a laser oscillator (not shown). The laser oscillator is a laser light source that emits laser light, and emits the laser light as laser beam B, which is incident on a galvanometer scanner (not shown). The laser beam B is then reflected by the galvanometer scanner, enters the chamber 11 through the cover glass 21, and is irradiated on the powder material A. Any type of laser oscillator may be used as long as it can emit a laser beam B that can melt the powder material A. Any type of galvanometer scanner may be used as long as it can irradiate the laser beam B to the desired position. A mechanism other than a galvanometer scanner may be used to adjust the irradiation position of the laser beam B.

The beam emitting unit 2 controls the irradiation of the laser beam B. For example, the beam emitting unit 2 uses three-dimensional CAD (Computer-Aided Design) data of the object to generate two-dimensional slice data. The three-dimensional CAD data of the object is three-dimensional shape data of the object. The slice data is data of the horizontal cross section of the object, and is a collection of a large number of data according to the vertical position of the object. Based on the slice data, the beam emitting unit 2 sets a modeling area where the laser beam B should irradiate the powder material A, and irradiates the powder material A on the modeling area with the laser beam B. Note that the above-mentioned irradiation control may be performed by a controller separate from the beam emitting unit 2.

When the laser beam B is irradiated onto the powder material A, fumes F are generated. The fumes F are smoke that is generated by heating and melting the powder material A. If the fumes F come into contact with and adhere to the cover glass 21, the desired laser beam B cannot be obtained, and this causes problems in the fabrication of the object. For this reason, it is desirable to accurately exhaust the fumes F from the fabrication space in the chamber 11 so as not to adversely affect the fabrication of the object.

The first gas supply unit 3 and the second gas supply unit 4 are mechanisms for eliminating fumes F generated by beam irradiation using inert gas G, and are configured to spray inert gas G in a direction intersecting the irradiation direction of the laser beam B. For example, when the irradiation direction of the laser beam B is vertical, the spray direction of the inert gas G sprayed from the first gas supply unit 3 and the second gas supply unit 4 is horizontal. Note that the vertical direction here includes a direction that is nearly vertical, and the horizontal direction includes a direction that is nearly horizontal. In this way, by the first gas supply unit 3 and the second gas supply unit 4 spraying inert gas G in a direction that intersects the irradiation direction of the laser beam B, the fumes F generated by the irradiation of the laser beam B can be made to flow sideways and discharged from the printing space.

The first gas supply unit 3 is provided in the chamber 11 and supplies an inert gas G to the periphery of the powder material A. The inert gas G is also called a shielding gas, and for example, a gas such as argon is used. The flow of the inert gas G is indicated by arrows in FIG. 1. The first gas supply unit 3 is attached to a position above and to the side of the table 12. The first gas supply unit 3 may be supported and attached to, for example, the base table 15 or the chamber 11. The first gas supply unit 3 sprays the inert gas G in the horizontal direction and sprays the inert gas G into the molding space above the powder material A. This removes fumes F generated by the laser irradiation from the molding space. The molding space is a space within the chamber 11 and is a space mainly used for molding. Specifically, the space around the optical path through which the laser beam B passes corresponds to this. The first gas supply unit 3 has a nozzle 31 for spraying the inert gas G. The tip of the nozzle 31 is directed toward the molding space above the powder material A, and the inert gas G is sprayed horizontally from the nozzle 31.

The second gas supply unit 4 is provided in the chamber 11 and supplies inert gas G to the periphery of the cover glass 21. The second gas supply unit 4 is attached to a position below and to the side of the cover glass 21, and sprays inert gas G in the horizontal direction, spraying the inert gas G into the printing space below the cover glass 21. This allows the fumes F rising from below to be exhausted to the side, preventing the fumes F from coming into contact with the cover glass 21.

The flow velocity of the inert gas G ejected from the second gas supply unit 4 is slower than the flow velocity of the inert gas G ejected from the first gas supply unit 3. For example, the flow velocity of the inert gas G ejected from the second gas supply unit 4 and flowing under the cover glass 21 is slower than the flow velocity of the inert gas G ejected from the first gas supply unit 3 and sprayed onto the fumes F. Specifically, the flow velocity of the inert gas G ejected from the second gas supply unit 4 is set to 0.05 to 0.5 m/s. Also, preferably, the flow velocity of the inert gas G ejected from the second gas supply unit 4 is set to 0.1 to 0.2 m/s.

By setting the flow rate of the inert gas G sprayed from the second gas supply unit 4 in this manner, the inert gas G can be made to flow gently around the cover glass 21. This makes it possible to prevent the fumes F below from being lifted up by the flow of inert gas G flowing around the cover glass 21. This makes it possible to prevent the fumes F from coming into contact with the cover glass 21.

The flow rate of the inert gas G ejected from the first gas supply unit 3 is set to be faster than the flow rate of the inert gas G ejected from the second gas supply unit 4. For example, the flow rate of the inert gas G ejected from the second gas supply unit 4 is set to 1.0 to 3.0 m/s. In order to accurately exhaust a large amount of fumes F generated by beam irradiation from the modeling space, it is desirable that the flow rate of the inert gas G ejected from the second gas supply unit 4 is fast. However, if the flow rate of the inert gas G ejected from the second gas supply unit 4 is too fast, the powder material A on the table 12 may fly up. For this reason, the flow rate is set to a level at which the powder material A does not fly up. The flow rate of the inert gas G ejected from the first gas supply unit may be set according to the type of powder material A. For example, when the powder material A is a heavy material, the flow rate of the inert gas G ejected from the first gas supply unit 3 may be set to be faster than when the powder material A is a material that is not heavier than the heavy material.

The height-wise width W4 of the inert gas G ejected from the second gas supply unit 4 is greater than the height-wise width W3 of the inert gas G ejected from the first gas supply unit 3. In other words, the height-wise thickness of the inert gas G ejected from the second gas supply unit 4 is greater than the height-wise thickness of the inert gas G ejected from the first gas supply unit 3. For example, by making the height-wise width of the outlet of the second gas supply unit 4 greater than the height-wise width of the outlet of the first gas supply unit 3, the height-wise width W4 of the inert gas G ejected from the second gas supply unit 4 can be made greater than the height-wise width W3 of the inert gas G ejected from the first gas supply unit 3. In this way, by making the height-wise width W4 of the inert gas G ejected from the second gas supply unit 4 greater than the height-wise width W3 of the inert gas G ejected from the first gas supply unit 3, the inert gas G flowing gently below the cover glass 21 can be made thicker. Therefore, the thick flow of inert gas G can direct the fumes F rising from below to the side, preventing the fumes F from entering the vicinity of the cover glass 21.

2 is an enlarged vertical cross-sectional view of the second gas supply unit 4, and FIG. 3 is a perspective view of the second gas supply unit 4. The second gas supply unit 4 includes a tank 41 and a deceleration member 42, and has an outlet 43 for ejecting the inert gas G downstream of the deceleration member 42. The tank 41 is a container for storing the inert gas G, and for example, a box-shaped one is used. The deceleration member 42 is provided downstream of the tank 41. The deceleration member 42 is a member for decelerating the flow rate of the inert gas G flowing out of the tank 41. For example, a mesh member is used as the deceleration member 42. As shown in FIG. 2 and FIG. 3, a rectangular plate-shaped mesh member is used as the deceleration member 42, and multiple mesh members may be stacked to reduce the pressure of the inert gas G to a desired pressure. Note that, as the deceleration member 42, a member other than a mesh member may be used as long as it can decelerate the inert gas G. In addition, when the inert gas G can be pressure-adjusted and flowed into the tank 41, the installation of the deceleration member 42 may be omitted.

A straightening member 44 is provided downstream of the deceleration member 42. The straightening member 44 is a member that straightens the flow of the inert gas G, and is, for example, a honeycomb structure. In other words, the straightening member 44 is a honeycomb structure configured by arranging a plurality of holes with a hexagonal cross section, and the plurality of holes are provided in the direction of flow of the inert gas G. The inert gas G that has permeated the deceleration member 42 is straightened by the straightening member 44 and sent out. The opening on the downstream side of the straightening member 44 is the outlet 43. In other words, the inert gas G that has passed through the straightening member 44 is ejected from the outlet 43 toward the molding space below the cover glass 21. Note that, as the straightening member 44, a member other than a honeycomb structure may be used as long as it can straighten the flow of the inert gas G.

A guide plate 45 is formed downstream of the rectifying member 44. The guide plate 45 is a plate for guiding the inert gas G ejected from the rectifying member 44 to a position below the cover glass 21. The guide plates 45 are provided vertically on both sides of the rectifying member 44, one on each side, and extend in the ejection direction of the inert gas G. The guide plates 45 ensure that the inert gas G flows toward a position below the cover glass 21. In addition, in FIG. 2 and FIG. 3, the tank 41, the deceleration member 42, and the rectifying member 44 are accommodated side by side in one housing to form the second gas supply unit 4, but the tank 41, the deceleration member 42, and the rectifying member 44 may be formed separately and connected to each other to form the second gas supply unit 4.

In this way, by providing the deceleration member 42 in the second gas supply unit 4, the inert gas G sent to the tank 41 can be decelerated and ejected from the ejection port 43. Therefore, even if the ejection port 43 is made large, the flow rate of the inert gas does not become large, and the inert gas G can be supplied in a wide range in the height direction. This allows the cover glass 21 to be adequately protected from fumes F.

In FIG. 1, an exhaust path 13 and a guide member 14 are provided within the chamber 11. The exhaust path 13 is a flow path for exhausting the inert gas G from the chamber 11. The guide member 14 is a member for guiding the inert gas G within the chamber 11 to the exhaust path 13. For example, the guide member 14 is provided on the opposite side of the optical path of the laser beam B from the first gas supply unit 3 and the second gas supply unit 4. The guide member 14 may be configured in a shape that guides the inert gas G ejected from the first gas supply unit 3 and the second gas supply unit 4 to the exhaust path 13.

A pump 16, a filter 17, and a pipe 18 are provided outside the chamber 11. The pump 16 pumps the inert gas G to the first gas supply unit 3 and the second gas supply unit 4. The pipe 18 is configured to connect the output side of the pump 16 to the first gas supply unit 3 and the second gas supply unit 4, and to connect the input side of the pump 16 to the exhaust path 13. The filter 17 is for removing fumes F, and is installed between the exhaust path 13 and the input side of the pump 16. A valve 53 is provided in the first gas supply unit 3 of the pipe 18, and a valve 54 is provided on the input side of the second gas supply unit 4. The valve 53 is a valve that adjusts the flow rate of the inert gas G sent to the first gas supply unit 3. The valve 54 is a valve that adjusts the flow rate of the inert gas G sent to the second gas supply unit 4. In addition, if the flow rate of the inert gas G can be adjusted by adjusting the output of the pump 16, the installation of the valves 53 and 54 may be omitted. As shown in FIG. 1, the pipe 18 may be configured to supply the inert gas G into the chamber 11 from the lower part of the chamber 11.

Next, the operation of the three-dimensional modeling device 1 according to this embodiment will be described.

In FIG. 1, the table 12 of the base stand 15 is set in an upper position, and powder material A is spread evenly on the table 12. Then, the pump 16 is operated, and inert gas G is sent to the first gas supply unit 3 and the second gas supply unit 4 through the piping 18. Then, the inert gas G is sprayed from the first gas supply unit 3 and the second gas supply unit 4, and the inert gas G is supplied to the modeling space.

Then, the beam emission unit 2 is activated, and the laser beam B is emitted from the beam emission unit 2. The laser beam B enters the chamber 11 through the cover glass 21 and is irradiated onto the powder material A on the table 12. The irradiation of the powder material A with the laser beam B generates fumes F. At this time, since the first gas supply unit 3 is spraying the inert gas G toward the periphery of the powder material A, most of the fumes F generated by the powder material A are discharged to the side from the printing space.

However, some of the fumes F may not be completely discharged by the inert gas G from the first gas supply unit 3 and may move upward. In response to this, the second gas supply unit 4 sprays inert gas G toward the periphery of the cover glass 21. As a result, the fumes F rising from below are discharged from the printing space by the inert gas G sprayed from the second gas supply unit 4. At this time, the flow rate of the inert gas G sprayed from the second gas supply unit 4 is set slower than the flow rate of the inert gas G sprayed from the first gas supply unit 3, and is gentler. For example, the flow rate of the inert gas G sprayed from the second gas supply unit 4 is set to be within a speed range of 0.05 to 0.5 m/s, and preferably within a speed range of 0.1 to 0.2 m/s.

By gently flowing the inert gas G around the cover glass 21 in this way, it is possible to prevent the fumes F below from being lifted up by the flow of the inert gas G. Therefore, it is possible to prevent the fumes F from coming into contact with the cover glass 21. If the flow rate of the inert gas G blown out from the second gas supply unit 4 is faster than the above-mentioned speed range, the fumes F are lifted up by the strong flow of the inert gas G. On the other hand, if the flow rate of the inert gas G blown out from the second gas supply unit 4 is slower than the above-mentioned speed range, the flow of the inert gas G is too weak to sufficiently exhaust the fumes F rising from below. In these cases, the rising fumes F may come into contact with the cover glass 21 and the fumes F may adhere to the cover glass 21. If the fumes F adhere to the cover glass 21, the intensity of the laser beam B may decrease, the focal position of the laser beam B may change due to a phenomenon called the thermal lens effect, or the laser diameter of the laser beam B may expand, resulting in a decrease in energy density. This can result in the powder material A being improperly melted, making it impossible to obtain the desired characteristics for the object, or insufficient melting can cause the modeling surface to bulge, forcing the modeling to be stopped. In contrast, in the three-dimensional modeling device 1 according to this embodiment, the flow of the inert gas G sprayed from the second gas supply unit 4 is appropriately slowed down, thereby suppressing the lifting of the fumes F and allowing the fumes F to be appropriately removed from the modeling space. As a result, the cover glass 21 can be adequately protected by the inert gas G sprayed from the second gas supply unit 4.

The inert gas G ejected from the second gas supply unit 4 flows widely in the height direction. In other words, the inert gas G ejected from the second gas supply unit 4 flows below the cover glass 21 with a certain thickness in the height direction. Therefore, the fumes F rising from below are caused to flow to the side of the chamber 11 together with the inert gas G. This makes it possible to prevent the fumes F from entering the vicinity of the cover glass 21, and to adequately protect the cover glass 21 from the fumes F.

After the laser beam B has been irradiated to a specified area of the powder material A, the table 12 moves downward, new powder material A is spread evenly, and the laser beam B is irradiated again. By repeating these steps, an object is layered and manufactured.

As described above, according to the three-dimensional modeling device 1 of this embodiment, by making the flow rate of the inert gas G ejected from the second gas supply unit 4 slower than the flow rate of the inert gas G ejected from the first gas supply unit 3, it is possible to prevent the fumes F generated by the beam irradiation from being picked up by the flow of the inert gas G ejected from the second gas supply unit 4 and flowing toward the cover glass 21. Therefore, the cover glass 21 can be adequately protected by the inert gas G ejected from the second gas supply unit 4. Therefore, the influence of the fumes F can be suppressed and an object can be appropriately modeled.

In addition, according to the three-dimensional modeling device 1 of this embodiment, the first gas supply unit 3 and the second gas supply unit 4 spray the inert gas G in a direction intersecting the irradiation direction of the laser beam B. This allows the fumes F generated by the irradiation of the laser beam B to flow to the side of the modeling space, and prevents the fumes F from adhering to the cover glass 21.

In addition, according to the three-dimensional modeling device 1 of this embodiment, the second gas supply unit 4 has a tank 41 for storing inert gas G and a deceleration member 42 that is provided downstream of the tank 41 and decelerates the flow rate of the inert gas G, and an outlet 43 for ejecting the inert gas G is formed downstream of the deceleration member 42. By having the deceleration member 42 that decelerates the flow rate of the inert gas G, the inert gas G sent to the tank 41 can be decelerated and ejected from the outlet 43. Therefore, even if the outlet 43 is formed large, the flow rate of the inert gas G does not become too large, and the inert gas G can be supplied in a wide range in the height direction. This allows the cover glass 21 to be adequately protected from fumes F rising from below.

In addition, according to the three-dimensional modeling apparatus 1 of this embodiment, the flow rate of the inert gas G sprayed from the second gas supply unit 4 may be 0.1 to 0.2 m/s. In this case, the inert gas sprayed from the second gas supply unit flows gently. This makes it possible to prevent the fumes F from being caught in the flow of the inert gas G sprayed from the second gas supply unit 4 and flowing toward the cover glass 21. Therefore, the cover glass 21 can be adequately protected by the inert gas G sprayed from the second gas supply unit 4.

Although the three-dimensional modeling device 1 according to the embodiment of the present disclosure has been described above, the three-dimensional modeling device according to the present disclosure is not limited to the above-described embodiment. The invention according to the present disclosure can be modified in various ways without departing from the spirit of the claims.

For example, in the above embodiment, a case has been described in which a laser beam B is irradiated onto powder material A as an energy beam to form an object, but an energy beam other than laser beam B may also be irradiated.

In addition, in the above embodiment, the case where the beam emitting unit 2 emits one laser beam B has been described, but the beam emitting unit 2 may emit multiple laser beams B. For example, as shown in FIG. 4, a multi-beam system may be used in which multiple laser beams B are used to form an object. In this case, by providing a second gas supply unit 4 for each laser beam B, each cover glass 21 can be adequately protected from fumes F, and the object can be appropriately formed.

REFERENCE SIGNS LIST 1 Three-dimensional modeling device 2 Beam emission section 3 First gas supply section 4 Second gas supply section 11 Chamber 12 Table 13 Discharge path 14 Guide member 15 Base stand 16 Pump 17 Filter 18 Pipe 21 Cover glass 31 Nozzle 41 Tank 42 Decelerating member 43 Jetting port 44 Straightening member 45 Guide plate 53 Valve 54 Valve A Powder material B Laser beam F Fume G Inert gas W3 Width in height direction W4 Width in height direction

Claims (4)

A three-dimensional modeling apparatus that irradiates a modeling material in a chamber with an energy beam to melt and laminate the modeling material to form a three-dimensional object,
a beam output unit that outputs the energy beam, causes the energy beam to enter the chamber through a cover glass, and irradiates the building material with the energy beam;
a first gas supply unit provided in the chamber and supplying an inert gas to the periphery of the modeling material;
a second gas supply unit provided in the chamber and located above the first gas supply unit, and supplying the inert gas to a periphery of the cover glass;
a flow velocity of the inert gas ejected from the second gas supply unit is slower than a flow velocity of the inert gas ejected from the first gas supply unit,
The chamber includes a top surface on which the cover glass is provided and a side surface intersecting the top surface,
The second gas supply unit is attached to the top surface and configured to spray the inert gas into the molding space below the cover glass.
Three-dimensional modeling device. The first gas supply unit and the second gas supply unit eject the inert gas in a direction intersecting with an irradiation direction of the energy beam.
The three-dimensional modeling apparatus according to claim 1 . the second gas supply unit includes a tank for storing the inert gas and a deceleration member provided downstream of the tank and decelerating a flow rate of the inert gas,
An outlet for ejecting the inert gas is formed on the downstream side of the moderator member.
The three-dimensional modeling apparatus according to claim 1 or 2. The flow rate of the inert gas ejected from the second gas supply unit is 0.1 to 0.2 m/s.
The three-dimensional modeling apparatus according to any one of claims 1 to 3.

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