JP2021020322A - Three-dimensional molding apparatus and three-dimensional molding method - Google Patents

Abstract

To provide a three-dimensional molding apparatus capable of preventing a transmissive window from smearing.SOLUTION: A three-dimensional molding apparatus configured to irradiate a molding material with light L, melt and solidify the molding material, and mold a three-dimensional object comprises: a transmissive window 61 that allows the light to be transmitted; a tubular member 62 surrounding the transmissive window 61; and an air-supply section HL that supplies air inside the tubular member 62 so that inert gas GS flows downward from the transmissive window 61.SELECTED DRAWING: Figure 2

Description

The present invention relates to a three-dimensional modeling apparatus and a three-dimensional modeling method.

Conventionally, a method of three-dimensionally modeling is known.

First, in a manufacturing method in which three-dimensional modeling is performed in a chamber, a light transmitting window is installed in the chamber. Further, a tubular member is installed so as to surround the space area below the light transmitting window. Then, a gas having a temperature or type different from the atmosphere in the chamber is supplied to the inside of the tubular member. In such a configuration, in the step of irradiating the powder layer with a light beam to sinter or melt and solidify the powder, a method of causing a smoke-like substance called fume to move outward in the horizontal direction of the tubular member is used. It is known (see, for example, Patent Document 1).

However, when the modeling material used for modeling is preheated and melted by heating, pollutants and the like are often generated. Such contaminants often pollute transparent windows. That is, in the conventional method, the transparent window is easily contaminated by pollutants and the like.

One aspect of the present invention is to make the transmission window hard to get dirty.

The three-dimensional modeling apparatus according to one embodiment of the present invention is a three-dimensional modeling apparatus that irradiates a modeling material with light to melt and solidify the modeling material to form a three-dimensional object.
A transmission window that allows light to pass through,
The tubular member surrounding the transparent window and
Inside the tubular member, an air supply unit that supplies air so that the inert gas flows downward from the permeation window is provided.

According to the embodiment of the present invention, it is possible to prevent the transmission window from becoming dirty.

It is a figure which shows the whole structure example of the three-dimensional modeling apparatus. It is a figure which shows the example of the component part around a transmission window. It is a schematic diagram which shows the appearance example of a tubular member. It is a figure which shows the control example of a flow velocity and a flow rate. It is a figure which shows the example of the protrusion. It is a figure which shows the experimental result. It is a figure which shows the detail of the experimental result. It is a figure which shows the detail of the experimental result. It is a figure which shows the example of the flow in "Example 1". It is a figure which shows the example of the flow in "Comparative Example 1". It is a figure which shows the example of a three-dimensional object. It is a figure which shows the experimental result. It is a flowchart which shows the whole processing example. It is a figure which shows the modification.

Hereinafter, the optimum mode for carrying out the invention will be described with reference to the drawings.

<Example of 3D modeling device>
FIG. 1 is a diagram showing an example of the overall configuration of the three-dimensional modeling apparatus.

The three-dimensional modeling device 1 is a device for forming a layer containing a modeling material (hereinafter, simply referred to as "layer") (hereinafter, referred to as "layer forming device") and a device for irradiating the layer with light (hereinafter, "" It has a "light irradiation device").

The modeling material is a resin powder or the like for three-dimensional modeling. For example, the modeling material is a thermoplastic resin such as nylon. Further, the modeling material may include glass beads and the like. The modeling material may be polypropylene, ink, filament or the like. In the following description, a case where powder is used as a modeling material will be described.

The layer forming apparatus is, for example, a roller, a blade, or a combination thereof.

The light irradiation device is a light source or the like that emits laser light or the like. The laser beam is, for example, a CO2 laser, a semiconductor laser, or the like. Further, the light source may be light other than laser light. By irradiating the layer with light with a light source, the modeling material contained in the layer is melted.

Further, the light irradiation device may include a device for solidifying the modeling material.

Specifically, in the three-dimensional modeling device 1, the layer forming device and the light irradiation device are configured as follows. First, the three-dimensional modeling device 1 has a modeling tank 70. The modeling tank 70 has a configuration including a supply tank 11, a roller 12, and a scanning space 13.

The supply tank 11 is an example of a storage means for accommodating the powder P, which is an example of a modeling material.

The roller 12 is an example of a supply means for supplying the powder P contained in the supply tank 11. The number of rollers 12 may be plural or singular.

The scanning space 13 is an example of a space scanned by the laser beam L, which is an example of light, with respect to the powder P arranged by the roller 12.

A transmission window 61 through which light is transmitted is installed in the modeling tank 70. Specifically, the transmission window 61 is installed on a plate above the modeling tank 70 (in the direction of being located above in the figure), that is, a so-called top plate. The laser beam L emits light from the light source 18, and becomes a path that hits the powder P via an optical system such as a reflector 19. Therefore, the transmission window 61 is installed at a position where the laser beam L is transmitted and the powder P inside the modeling tank 70 is irradiated with the laser beam L. Further, since the laser beam L is scanned for drawing, the transmission window 61 should be installed at a position and a size that sufficiently includes a scanning range (may have a margin). desirable.

The transmission window 61 may be referred to as a light transmission window, a laser transmission window, or the like. Hereinafter, it is simply referred to as a "transparent window".

The light source 18 is, for example, a light source that emits laser light L. There may be an optical system such as a reflector 19 that changes the path of the laser beam L so that the laser beam L is directed toward the powder P. The optical system may also include a diaphragm, a lens, a filter, and the like.

Further, the three-dimensional modeling device 1 has a heating device such as a heater 11H and a heater 13H. For example, two pairs of heaters 11H and 13H are arranged above the modeling tank 70, and a total of six heaters are arranged. The heating device is not limited to the heater, and may be any device capable of heating powder or the like. Further, the position and number of the heating devices are not limited to the configuration as in the three-dimensional modeling device 1.

As long as the heating device can preheat or melt the powder P, the type of device, the number of devices, and the arrangement of the devices are not limited.

The three-dimensional modeling device 1 has an engine 30. Graphical data 40 and the like are input to the engine 30 from an external device. The engine 30 is, for example, an information processing device.

The graphic data 40 is data showing the shape and the like of a modeled object in 3D. For example, the graphic data 40 is in a CAD (Computer Aided Design) format or the like.

When the engine 30 receives the graphic data 40, the engine 30 slices the graphic data 40 in the stacking direction to generate two-dimensional data 41 and the like. The laser irradiation path 50 and the like are determined based on the two-dimensional data 41 and the like generated in this way. Based on such a laser irradiation path 50 and the like, the driver 31 and the like control the light source 18 and the reflector 19 and the like.

When the driver 31 changes the direction of the reflector 19 by an actuator or the like, the laser beam L is applied to the position indicated by the two-dimensional data 41 through the transmission window 61.

Then, the powder P melts at the position where the laser beam L irradiates. Then, when the molten powder is sintered, a layer constituting a three-dimensional object can be formed. In this way, the layer constituting the three-dimensional object is formed by the light irradiation device including the light source 18 and the like.

As described above, when the modeling material is melted and solidified, contaminants are likely to be generated.

The pollutant is a smoke-like substance called "fume" or the like. Specifically, the pollutant is a volatile substance such as metal vapor or resin vapor. When such a pollutant adheres to the transmission window 61, it often causes a decrease in light transmittance, refractive index, or the like. Therefore, when a pollutant adheres to the transmission window 61, a phenomenon such as difficulty in transmitting light is likely to occur, and the quality of modeling deteriorates. Therefore, if it is difficult for contaminants to adhere to the transmission window 61, the quality of modeling and the like can be stabilized.

Further, a piston 11P, a piston 13P, and the like are installed in the supply tank 11 and the scanning space 13. With such a piston 11P, a piston 13P, and the like, the powder P can move upward or downward, so that the position moves to the powder P as the layer formation progresses.

<Structure example of transparent window, tubular member and air supply part>
Hereinafter, the constituent parts (hereinafter referred to as “transparent window peripheral constituent portion PRT”) including the transparent window, the tubular member, the air supply portion, and the like in FIG. 1 will be extracted and described.

FIG. 2 is a diagram showing an example of a component around a transparent window. For example, the transmission window 61 is used so as to be supported by the tubular member 62.

Below, the upper part in the figure is "upper" (the one where the light source is installed), and the lower part in the figure is "lower" (the one where the powder layer (hereinafter "powder layer PL" is formed in advance). This will be described by taking the case of).

FIG. 2A is a cross-sectional view showing an example of the transmission window peripheral component PRT.

FIG. 2B is a cross-sectional view showing a cross section AA'.

For example, the air supply unit is realized by the air supply port HL and the path for supplying the inert gas GS from the outside to the inside of the tubular member 62. The air supply unit does not have to have a route and a component configuration such as an air supply port HL.

It is desirable that the air supply port HL is formed in the transmission window peripheral component PRT by a tubular member 62 or the like. Further, it is desirable that the air supply port HL is formed in an annular shape inside the tubular member 62, for example, as shown in FIG. 2 (B).

As described above, when the air supply port HL is annular inside the tubular member 62, the bias can be reduced in supplying the inert gas GS to the transmission window 61. That is, when it is annular, the inert gas GS is likely to be uniformly supplied on the circumference. Further, with the annular air supply port HL as described above, the inert gas GS can be easily flowed at a uniform flow velocity.

Further, there may be a pressure holding space serving as a buffer layer in the vicinity of the air supply port HL.

The air supply port HL supplies, for example, the inert gas GS to the inside of the tubular member 62. Further, the air supply is performed so that the air supply port HL faces the transmission window 61, that is, the inert gas GS is sprayed from the outside onto the transmission window 61 inside the tubular member 62. With such a direction of air supply, the inert gas GS hits the transmission window 61 and repels. In this way, the inert gas GS hits the transmission window 61 and flows from above to below. When the air is supplied so as to create the flow of the inert gas GS, the inert gas GS prevents the pollutants from flowing from the lower side to the upper side toward the permeation window 61.

The inert gas GS is, for example, nitrogen or argon. However, the inert gas GS is not limited to this, and may contain other types of gases. That is, the inert gas GS may be a gas that has little effect on the modeling material or the like even at a high temperature.

Therefore, it is desirable that the air supply port HL is formed at a distance at which the inert gas GS can be sufficiently applied to the transmission window 61.

Further, the tubular member 62 has the following shape, for example.

FIG. 3 is a schematic view showing an example of the appearance of the tubular member. The tubular member 62 may have a notch 620. That is, the tubular member 62 may have a portion that interferes with the laser beam L depending on the length or the like. It is desirable that a notch portion 620 is formed in a portion or the like that is likely to interfere with the laser beam L. As described above, when the cutout portion 620 is provided, the laser beam L does not interfere with the tubular member 62, so that the laser beam L can be widely scanned. A plurality of cutout portions 620 may be evenly arranged in the arc of the tubular member, or one cutout portion 620 may be arranged.

<Example of flow velocity and flow rate control>
It is desirable that the flow velocity, flow rate, etc. of the inert gas GS be controlled. For example, the flow velocity, the flow rate, and the like are controlled by an information processing device such as an engine 30 which is an example of a control unit. The control unit may be a control device or the like having a regulating valve or the like for controlling the flow velocity and the flow rate of the inert gas GS.

The flow rate is, for example, the volume of the inert gas GS supplied per unit time from the air supply port HL. Hereinafter, the flow rate is shown in units of "liters per minute".

The flow velocity is the speed at which the inert gas GS at the air supply port HL flows inward of the tubular member 62. Hereinafter, the flow velocity is shown in units of "meters per second".

FIG. 4 is a diagram showing an example of controlling the flow velocity and the flow rate. For example, it is desirable that the flow velocity and the flow rate are controlled so as to be in the first region ER1. In the figure, the horizontal axis shows the "flow velocity" and the vertical axis shows the "flow velocity".

The first region ER1 has a flow rate of about 18 to 22 liters per minute and a flow velocity of about 0.75 to 1.5 meters per second. It is desirable that the inert gas GS be controlled so as to have such a flow velocity and a flow rate.

When the molding height is lower than about 100 mm, the flow velocity and the flow rate may be controlled so as to be in the second region ER2.

The second region ER2 has a flow rate of about 15 to 25 liters per minute and a flow velocity of about 0.5 to 2 meters per second. It is desirable that the inert gas GS be controlled so as to have such a flow velocity and a flow rate.

If the flow of the inert gas GS is controlled so as to have such a flow velocity and a flow rate, it is possible to prevent the transmission window from becoming dirty.

<Example of protrusion>
FIG. 5 is a diagram showing an example of a protrusion. For example, it is desirable that the transmission window peripheral component PRT is further provided with a protrusion.

Compared with FIG. 2, FIG. 5 is different in that the flow path plate BD, which is an example of the protrusion, is added. The flow path plate BD is installed along the inside of the tubular member 62, for example. It is desirable that the flow path plate BD has a position, shape and length that guides the inert gas GS supplied from the air supply port HL to the inside of the tubular member 62.

In this way, if there is a protrusion on the inside of the tubular member 62, the inert gas GS supplied from the air supply port HL is more likely to hit the transmission window 61, that is, from the air supply port HL to the transmission window 61. It is easy to be guided to flow toward. Therefore, the presence of such a protrusion can enhance the flow of the inert gas GS, which repels the pollutants flowing from lower to upper. Further, if the tubular member 62 has a protrusion inside, the structure can be made so that pollutants do not easily enter from the air supply port HL.

<Experimental results>
FIG. 6 is a diagram showing the experimental results. The figure shows the results of the experiment under the following conditions.

"Example 1"
Modeling material: Polybutylene terephthalate (PBT) resin (trade name: Novaduran (registered trademark) 5020, manufactured by Mitsubishi Engineering Plastics Co., Ltd., melting point: 218 ° C, glass transition temperature: 43 ° C)
Number average particle size Dn: 55 to 85 μm (The number average particle size Dn is the result of measurement using a particle size distribution measuring device (F-PIA3000 manufactured by Sysmex Corporation)).
With protrusions Inert gas type: Nitrogen Inert gas temperature: 50 ° C
Combination of flow velocity and flow rate at the air supply port:
0.75 m / s and 22 liters / min 1.5 m / s and 22 liters / min 0.75 m / s and 18 liters / min 1.5 m / s and 18 liters / min 0.9 m / s / 20 liters / min Total stacking height: 50 mm Laser light type: CO2 laser Laser irradiation diameter: 0.48 mm Stacking pitch: 0.1 mm Laser output: 60 watts (Infill modeling (when modeling the inside of the modeling area) ), 20 watts (outline modeling (when modeling the outline of the modeling area))
Laser scan speed: 15 meters per second (infill modeling), 4 meters per second (outline modeling)
Supply tank heating temperature: 200 ° C
Laser scanning space Heating temperature: 217 ° C
Scanline pitch: 0.2 mm Solid: ISO 3167 Type1A Multipurpose dogbone-like test specimen (specimen has a central part 80 mm long, 4 mm thick, 10 mm wide, and has a long side length A total of 52 pieces (which are 170 mm) are formed with 14 pieces / surface x 3 steps (3 levels of modeling heights of 20 mm, 32 mm, and 44 mm). In this modeling, in the coordinate system of FIG. 1, the length of the modeled object is arranged so as to be the X axis, the 4 mm thickness direction is the Z axis, and the 10 mm width direction is the Y axis.

The experiment conducted under the above conditions is hereinafter referred to as "Example 1".

Evaluation method: Observation of dirt on the transmission window and tensile strength of the ISO test piece

"Example 2"
In Example 2, the flow velocity and the flow rate were set to the second region ER2 in FIG. Therefore, in "Example 2", the combination of the flow velocity and the flow rate at the air supply port is as follows.

Combination of flow velocity and flow rate at the air supply port:
0.5 meters per second and 25 liters per minute 2 meters per second and 25 liters per minute 0.6 meters per second and 20 liters per minute 1.7 meters per second and 20 liters per minute 0.5 meters per second and 15 liters per minute 2 meters Every second and 15 liters per minute Other conditions are the same as in Example 1, and the description thereof will be omitted.

"Comparative Example 1"
In "Comparative Example 1", the combination of the flow velocity and the flow rate at the air supply port is as follows.

Combination of flow velocity and flow rate at the air supply port:
0.4 meters per second and 26 liters per minute 2.1 meters per second and 26 liters per minute 0.5 meters per second and 14 liters per minute 2.1 meters per second and 14 liters per minute Other conditions include Example 1. The same applies to the above, and the description thereof will be omitted.

"Comparative Example 2"
In "Comparative Example 2", the combination of the flow velocity and the flow rate at the air supply port is as follows.

Combination of flow velocity and flow rate at the air supply port:
2.2 m / sec and 12 liter / min Other conditions are the same as in Comparative Example 1, and the description thereof will be omitted.

The result of such an experiment is shown in FIG.

FIG. 7 is a diagram showing details of the experimental results.

In the figure, after the modeling is completed, the degree of dirt on the transparent window 61 is changed to "◎ (double circle)", "○ (circle)", and "△" in order from the one with the least dirt. (Triangle) ”and“ × (Batsu) ”are shown.

Further, "ISO test piece strength" shows the result of evaluating the tensile strength at the position of the molding height of 20 mm to 44 mm.

In "Example 1", since the transparent window could be prevented from becoming dirty, the experimental result was that the transparent window was almost clean. With such a flow velocity and flow rate, the adhesion of pollutants can be prevented more effectively. In addition, there is little change in strength, and it is possible to model a three-dimensional object with stable quality.

"Example 2" was an experimental result in which the dirt on the transparent window could be reduced. With such a flow velocity and flow rate, it is possible to prevent the adhesion of pollutants. In addition, there is relatively little change in strength, and it is possible to model a three-dimensional object with stable quality.

"Comparative Example 1" and "Comparative Example 2" are experimental results in which the transparent window is contaminated. In addition, the experimental results showed that the tensile strength was also reduced. As described above, the experimental result shows that the maximum strength is lowered to about "50 MPa" to "42 MPa".

<Example of effect>
FIG. 8 is a diagram showing an example of a flow. By supplying air so that the inert gas flows downward from the permeation window inside the tubular member, a flow of the inert gas (hereinafter referred to as "first flow FL1") can be created.

If there is a flow such as the first flow FL1, pollutants are generated, and even if there is a flow from the bottom to the top (hereinafter referred to as "second flow FL2"), the second flow FL2 is separated by the first flow FL1. Since it repels, it becomes difficult for contaminants to adhere to the transparent window. In this way, the dirt on the transparent window can be reduced.

Further, it is desirable that the flow is directed to flow in a predetermined direction as shown in the direction of the arrow (hereinafter referred to as "specific direction DR") in the figure. In this way, pollutants can be discharged efficiently. That is, if the DR in the specific direction has a discharge port or the like, the pollutant can be efficiently discharged.

FIG. 9 is a diagram showing an example of the flow in “Example 1”. Under the conditions of "Example 1", a flow of the inert gas (hereinafter referred to as "third flow FL3") can be created.

When the flow velocity and flow rate are set to the same as in the first region ER1, it is possible to create a flow such as the third flow FL3 that repels the second flow FL2.

<Flow of "Comparative Example 1">
FIG. 10 is a diagram showing an example of the flow in “Comparative Example 1”. When the inert gas is supplied so as to flow downward from the permeation window inside the tubular member having a flow rate and a flow velocity outside the second region ER2, the flow of the inert gas (hereinafter referred to as "fourth flow FL4"). ), To some extent, the second flow FL2 can be prevented. However, "Example 1" and the like can create a flow that can prevent pollutants more effectively.

Further, the experimental results for evaluating the tensile strength of the ISO tensile test piece in which the following three-dimensional object is generated and the laminated height is shaken are shown below.

FIG. 11 is a diagram showing an example of a three-dimensional object. The experimental results of evaluating the three-dimensional object formed by the three-dimensional modeling apparatus 1 in response to the graphic data for forming such a three-dimensional object are shown below.

FIG. 12 is a diagram showing the experimental results.

The experimental result EX shows the result obtained under the same conditions as in "Example 1".

The comparison result COM shows the result of performing under the same conditions as in "Comparative Example 2".

Compared with the comparison result COM, the experimental result EX is less likely to decrease in tensile strength (indicated by the vertical axis) even if the modeling height (indicated by the horizontal axis) is increased. On the other hand, as a result of comparison, the tensile strength of COM tends to decrease sharply as the molding height increases.

For example, the comparison result COM has a tensile strength of about "10 megapascals" when the molding height is about "400 mm", whereas the experimental result EX has a tensile strength of "42 megapascals" to "42 megapascals". Tensile strength of about "50 megapascals" can be maintained even when the molding height is about "480 mm". As described above, even if the molding height becomes high and the contaminants easily adhere to the transmission window 61, the tensile strength and the like can be secured.

<Example of overall processing of the three-dimensional modeling method>
FIG. 13 is a flowchart showing an example of overall processing.

In step S1, the layer forming apparatus or the like performs a layer forming procedure for forming a layer of the modeling material.

In step S2, the light irradiation device or the like performs a melting procedure of melting and solidifying the layer of the modeling material formed in step S1 based on the graphic data or the like. In this way, the three-dimensional modeling device 1 forms the three-dimensional object indicated by the graphic data.

In step S3, the air supply unit or the like performs an air supply procedure in which the inert gas is supplied downward from the permeation window inside the tubular member.

It should be noted that step S1 and step S2 and step S3 do not always have to be performed in parallel. For example, steps S1 and S2 may be repeated in modeling. Further, step S3 may be performed before, for example, steps S1 and S2 are performed.

<Modification example>
FIG. 14 is a diagram showing a modified example. Compared with FIG. 5A, in the modified example shown in FIG. 14, the installation position of the flow path plate BD is different. In this modification, the flow path plate BD is located above the air supply port HL and guides the inert gas GS rising from the air supply port HL toward the transmission window 61 as much as possible.

Even if there is a protrusion at such a position, the inert gas GS supplied from the air supply port HL flows toward the permeation window 61, that is, from the air supply port HL toward the permeation window 61. Can be guided. Therefore, the presence of such a protrusion can enhance the flow of the inert gas GS, which repels the pollutants flowing from lower to upper.

<Other Embodiments>
The three-dimensional modeling method may be applied as long as it is a powder bed melting method, a so-called PBF (Power Bed Fusion) method. The above has been described with an example of applying it to the SLS (Selective Laser Manufacturing) method of modeling a three-dimensional object by selectively applying laser light or the like to a floor with a modeling material. It may be other than this. For example, an SMS (Selective Mask Sintering) method in which a laser beam is applied in a plane using a mask may be used.

The embodiment of the present invention may be realized by a three-dimensional modeling system. That is, the three-dimensional modeling device may be composed of a plurality of devices. In addition, the three-dimensional modeling system may execute each process redundantly, distributed, parallel, virtualized, or a combination thereof.

Although an example in the embodiment has been described above, the present invention is not limited to the above embodiment. That is, various modifications and improvements are possible within the scope of the present invention.

1 Three-dimensional modeling device 11 Supply tank 11H Heater 11P Piston 12 Roller 13 Scanning space 13H Heater 13P Piston 18 Light source 19 Reflector 30 Engine 31 Driver 40 Graphic data 50 Laser irradiation path 61 Transmission window 62 Cylindrical member 70 Modeling tank BD Flow path plate COM comparison result DR Specific direction ER1 1st region ER2 2nd region FL1 1st stream FL2 2nd stream FL3 3rd stream FL4 4th stream GS Inert gas HL Air supply port L Laser beam P Powder PL Powder layer PRT Perimeter of transmission window Components

Japanese Patent No. 5764751

Claims (8)

It is a three-dimensional modeling device that irradiates the modeling material with light to create a three-dimensional object.
A transmission window that allows light to pass through,
The tubular member surrounding the transparent window and
A three-dimensional modeling device including an air supply unit that supplies an inert gas downward from the permeation window inside the tubular member. The three-dimensional modeling apparatus according to claim 1, wherein the air supply port for supplying the inert gas is formed in an annular shape inside the tubular member. The three-dimensional modeling apparatus according to claim 1 or 2, wherein the inert gas is flowed in a specific direction from the upper side to the lower side with respect to the pollutant flowing from the lower side to the upper side, and the pollutant is discharged. The three-dimensional modeling apparatus according to any one of claims 1 to 3, further comprising a control unit for controlling the flow velocity and the flow rate of the inert gas. The three-dimensional modeling apparatus according to claim 4, wherein the flow rate is 15 to 25 liters per minute, and the flow velocity at the air supply port is 0.5 to 2 meters per second. The three-dimensional modeling apparatus according to claim 4, wherein the flow rate is 18 to 22 liters per minute, and the flow velocity at the air supply port is 0.75 to 1.5 meters per second. The three-dimensional modeling apparatus according to any one of claims 1 to 6, further comprising a protrusion for guiding the inert gas inside the tubular member. A transparent window that allows light to pass through,
It has a tubular member that surrounds the transparent window.
It is a three-dimensional modeling method performed by a three-dimensional modeling device that irradiates a modeling material with the light to form a three-dimensional object.
A layer forming procedure in which the three-dimensional modeling apparatus forms a layer of the modeling material, and
The melting procedure in which the three-dimensional modeling device melts the layer,
A three-dimensional modeling method including an air supply procedure in which the three-dimensional modeling apparatus supplies air so that an inert gas flows downward from the permeation window inside the tubular member.