JP6879405B2 - Three-dimensional modeling device and three-dimensional modeling method - Google Patents

Description

The present invention relates to a stereolithography apparatus and stereolithographic how.

A three-dimensional modeling apparatus using an inkjet method is known. For example, by repeatedly executing a series of processes such as supplying powder, leveling the surface of the powder to form a powder layer, and discharging a molding liquid to the powder layer to form dots. , A three-dimensional modeling device for modeling a three-dimensional object is known.

Here, when the operation is restarted after the operation is stopped during the series of treatments, the dots due to the modeling liquid discharged on the powder layer before the series of treatments are stopped and the powder newly formed after the series of treatments are restarted. Dots from the modeling liquid discharged on the layer may not be combined and may be discontinuous. In this case, in the three-dimensional modeled object, the strength of the modeled region before and after resuming the operation may be lower than that of the other regions. That is, in the past, the strength of the three-dimensional model has decreased.

To solve the above problems and achieve the object, the present invention, the discharge unit to form a powder layer forming unit for forming a powder layer, the dots by ejecting the shaped solution to the surface of the powder layer When the operation related to the formation of the powder layer or the discharge of the modeling liquid is stopped and restarted, the dot region formed by the dots formed on the outermost surface of the powder layer before the operation is stopped. the shaped liquid from the discharge portion on at least part of said powder layer after being discharged is formed of a stereolithography apparatus.

According to the present invention, there is an effect that the decrease in strength of the three-dimensional model can be suppressed.

FIG. 1 is a schematic view showing an example of a three-dimensional modeling apparatus. FIG. 2 is a schematic diagram showing an example of a series of processing flows. FIG. 3 is a schematic view showing an example of the flow of modeling of a three-dimensional modeled object. FIG. 4 is a schematic diagram showing an example of a phenomenon in which dots between powder layers become discontinuous. FIG. 5 is a functional block diagram of the three-dimensional modeling apparatus. FIG. 6 is a schematic view showing an example of the flow of modeling of a three-dimensional modeled object. FIG. 7 is an explanatory diagram of a dot state. FIG. 8 is an explanatory diagram of a discharge region of the modeling liquid. FIG. 9 is an explanatory diagram showing an example of the relationship between the standby time and the discharge amount. FIG. 10 is a schematic view showing an example of the state of the powder layer. FIG. 11 is a flowchart showing an example of the procedure of the modeling process. FIG. 12 is a flowchart showing an example of the interrupt processing procedure. FIG. 13 is a hardware configuration diagram of the information processing device.

With reference to the accompanying drawings, an embodiment of the stereolithography apparatus and stereolithography how detail.

FIG. 1 is a schematic view showing an example of a three-dimensional modeling apparatus 10.

The three-dimensional modeling device 10 includes a modeling device 12, an information processing device 14, and a UI (user interface) unit 36. The modeling device 12 and the UI unit 36 are connected to the information processing device 14 so that data and signals can be exchanged.

The UI unit 36 receives various operation instructions by the user and displays various information. The UI unit 36 is, for example, a keyboard, a display with a touch panel, or the like. The UI unit 36 may have a configuration in which an operation unit that receives an operation instruction from a user and a display unit that displays various information are separated.

The information processing device 14 controls the modeling device 12. The modeling device 12 models a three-dimensional modeled object under the control of the information processing device 14. The modeling device 12 includes a supply unit 18, a flattening unit 16, a discharge unit 26, a modeling unit 22, and a maintenance unit 29.

The supply unit 18 stores the powder 20 to be supplied to the modeling unit 22. In the present embodiment, the supply unit 18 and the modeling unit 22 are continuously arranged in the first direction (see the arrow X direction in FIG. 1, hereinafter may be referred to as the first direction X). There is. In the present embodiment, the first direction X will be described as one direction in the horizontal plane. Further, in the present embodiment, the first direction X is a direction in which the supply unit 18 side is the upstream side and the modeling unit 22 side is the downstream side among the continuously arranged supply unit 18 and the modeling unit 22. It is explained as if.

The supply unit 18 includes a supply tank 18A, a stage 18C, and a support member 18B. The supply tank 18A stores the powder 20 inside. The supply tank 18A is open in the anti-vertical direction (in the direction of arrow ZA in FIG. 1). In the present embodiment, the supply tank 18A has an opening having the same shape and area as the opening of the modeling tank 22A (details will be described later) in the modeling portion 22, and is continuous with the modeling portion 22 in the first direction X. Are arranged.

The supply tank 18A is separately provided so that a predetermined amount of powder 20 is stored in the supply tank 18A when the storage amount of the powder 20 in the supply tank 18A becomes equal to or less than a predetermined amount. The powder 20 is supplied from the powder supply mechanism.

The stage 18C constitutes the inner bottom of the supply tank 18A. The stage 18C is supported by the support member 18B. The support member 18B supports the stage 18C so as to be movable in a direction orthogonal to the horizontal direction (see arrow Z in FIG. 1).

In the present embodiment, the support member 18B moves the stage 18C in the anti-vertical direction (see the arrow ZA direction in FIG. 1) by a predetermined amount under the control of the information processing device 14. As a result, a part of the powder 20 stored in the supply tank 18A protrudes toward the opening side of the supply tank 18A. When powder is supplied to the supply tank 18A from the powder supply mechanism, the support member 18B can move the stage 18C in the vertical direction (in the direction of arrow ZB in FIG. 1) under the control of the information processing device 14. Good.

A three-dimensional modeled object is modeled on the modeling unit 22. The modeling unit 22 includes a modeling tank 22A, a support member 22B, and a stage 22C.

The modeling tank 22A stores the powder 20 supplied from the supply unit 18. By discharging the modeling liquid 28 to the powder 20 stored in the modeling tank 22A, a three-dimensional model is formed in the modeling tank 22A. The modeling tank 22A opens in the anti-vertical direction (in the direction of arrow ZA in FIG. 1). The opening of the modeling tank 22A is continuously arranged in the first direction X with respect to the opening of the supply tank 18A.

The stage 22C constitutes the inner bottom of the modeling tank 22A. The stage 22C is supported by the support member 22B. The support member 22B supports the stage 22C so as to be movable in a direction orthogonal to the horizontal direction (see arrow Z in FIG. 1).

In the present embodiment, the support member 22B moves the stage 22C in the vertical direction (see the arrow ZB direction in FIG. 1) by a predetermined amount under the control of the information processing device 14. As a result, a space for holding the powder 20 newly supplied from the supply unit 18 is formed on the opening side of the modeling tank 22A.

The flattening portion 16 is a member that is long in a direction (Y direction in FIG. 1) orthogonal to the first direction X, which is the arrangement direction of the supply portion 18 and the modeling portion 22 at the opening of the supply tank 18A. .. The flattening portion 16 has, for example, a columnar shape or a plate shape.

The flattening portion 16 is supported so as to be reciprocally movable toward the upstream side and the downstream side of the first direction X. The flattening unit 16 reciprocates toward the upstream side and the downstream side of the first direction X under the control of the information processing device 14.

The flattening unit 16 has an initial position on the upstream side of the first direction X from the supply unit 18, and moves in the first direction X toward the downstream side of the first direction X under the control of the information processing device 14. .. As a result, the powder 20 protruding from the opening of the supply tank 18A is supplied to the modeling unit 22 side and is supplied to the modeling unit 22.

Further, the flattening unit 16 moves to the downstream side in the first direction X under the control of the information processing device 14. As a result, the flattening unit 16 flattens the surface of the powder 20 supplied to the modeling unit 22 by leveling it in the first direction X, and forms the powder layer 24 having a layer thickness J in the modeling tank 22A. To do.

The flattening unit 16 moves from the upstream side in the first direction X from the supply unit 18 to the downstream side in the first direction X from the modeling unit 22 to form the powder layer 24, and then the first It moves to the upstream side in the direction X of 1 and returns to the above reference position.

In the present embodiment, the supply unit 18 stores the powder 20 to be supplied to the modeling unit 22, and the flattening unit 16 moves in the first direction X, so that the powder stored in the supply unit 18 is stored. The case where the body 20 is supplied to the modeling unit 22 and the powder layer 24 is formed will be described. However, the supply unit 18 supplies the powder 20 to the modeling unit 22, and the flattening unit 16 smoothes the surface of the powder 20 supplied to the modeling unit 22 to form the powder layer 24. May be good.

The discharge unit 26 discharges the modeling liquid 28 at a position on the surface of the powder layer 24 according to the object to be modeled to form the dots 30.

The discharge unit 26 includes a mechanism using a known inkjet method. The discharge unit 26 has a first direction X, a direction orthogonal to the horizontal direction (in FIG. 1, the arrow Z direction), and a direction orthogonal to the first direction and the arrow Z direction (in FIG. 1, the arrow Y direction). And, each of them is movably supported.

The discharge unit 26 forms the dots 30 by discharging the modeling liquid 28 at a position on the surface of the powder layer 24 according to the object to be modeled under the control of the control unit 14B. Specifically, the ejection unit 26 forms the dots 30 by ejecting droplets of the modeling liquid 28 from each of the plurality of nozzles.

The maintenance unit 29 is a mechanism for maintaining and recovering the discharge unit 26. The maintenance unit 29 has a mechanism for recovering the discharge defect of the modeling liquid 28 in the discharge unit 26. The maintenance unit 29 may be a known maintenance mechanism used for the inkjet head. For example, the maintenance unit 29 may be configured to include a mechanism for sucking the molding liquid 28 from the nozzle of the discharge unit 26, a mechanism for wiping (wiping) the nozzle surface of the discharge unit 26, and the like.

The information processing apparatus 14 repeats a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the molding liquid 28 in this order, so that the supply unit 18, the flattening unit 16, and the discharge unit 26 are repeated. By controlling the above, a three-dimensional model corresponding to the object to be modeled is modeled.

Here, the powder 20 has a structure in which the surface of the particulate base material is covered with a coating layer (details will be described later). The modeling liquid 28 is a liquid having a function of dissolving and then solidifying the coating layer (details will be described later).

Therefore, in the powder layer 24, at least a part of the coating layer of the powder 20 is dissolved and bonded to each other in the powder 20 in the region where the modeling liquid 28 is discharged and the dots 30 are formed. Then, by repeating the formation of the powder layer 24 and the formation of the dots 30 by discharging the modeling liquid 28, the dot regions formed by the dots 30 formed on each powder layer 24 are continuously solidified to form a three-dimensional model. It will be modeled.

FIG. 2 is a schematic view showing an example of a series of processing flows of supplying the series of powders 20, forming the powder layer 24, and discharging the molding liquid 28. The following series of processes is performed under the control of the information processing device 14.

The powder 20 is supplied to the modeling unit 22 by the supply unit 18 and the flattening unit 16, and is flattened in the first direction X by the flattening unit 16, so that, for example, the first powder layer 24 (powder) Body layer 24 ₁ ) is formed (see FIG. 2 (A)).

Then, the discharge unit 26, the surface of the powder layer 24 _1, ejecting the shaped solution 28 to a position corresponding to the shaped object (see FIG. 2 (A)). As a result, dots 30 formed by the molding liquid 28 are formed on _{the powder layer 24 1 (see FIG. 2B).}

Next, under the control of the information processing device 14, the support member 22B moves the stage 22C in the vertical direction (arrow ZB direction) by a predetermined amount (see FIG. 2C). As a result, a space for holding the powder 20 newly supplied from the supply unit 18 is formed on the opening side of the modeling tank 22A. The predetermined amount may be an amount equal to or greater than the layer thickness J of the powder layer 24 to be formed.

The layer thickness J of the powder layer 24 may be, for example, a thickness at which one drop of the modeling liquid 28 discharged from the discharge portion 26 permeates from one end to the other end in the thickness direction of the one layer powder layer 24. Just do it. The layer thickness J varies depending on the type of the powder 20, the type of the molding liquid 28, the discharge characteristics of the discharge portion 26, and the like. The layer thickness J is, for example, several tens to 100 μm.

Next, under the control of the information processing device 14, the support member 18B moves the stage 18C in the anti-vertical direction (arrow ZA direction) by a predetermined amount. The predetermined amount may be an amount capable of projecting the amount of powder 20 required for forming the powder layer 24 having a layer thickness J in the molding portion 22 toward the opening side of the supply tank 18A. As a result, a part of the powder 20 stored in the supply tank 18A protrudes from the opening side of the supply tank 18A (see FIG. 2C).

Then, the flattening unit 16 moves in the first direction X from the initial position on the upstream side of the first direction X from the supply unit 18 toward the downstream side of the first direction X under the control of the information processing device 14. To do. As a result, the powder 20 protruding from the opening of the supply tank 18A is supplied to the modeling unit 22 side and supplied to the modeling unit 22 (see FIGS. 2C and 2D).

Then, the flattening portion 16 further moves to the downstream side in the first direction X. Thus, flattening unit 16 is planarized by leveling the surface of the powder 20 supplied to the shaping part 22 in the first direction X, to form a powder layer 24 ₂ having a thickness of J (FIG. 2 (D)). Thus, on the powder layer 24 ₁ formed of dots 30 by a series of processes of previous powder layer 24 ₂ is laminated by a series of processes of this time.

Then, the information processing device 14 controls the modeling device 12 so as to repeat the series of processes shown in FIGS. 2 (A) to 2 (D). The information processing apparatus 14 is formed on the powder layer 24 by the previous series of processes (a series of processes of FIGS. 2 (C), 2 (D), 2 (A), and 2 (B)). A series of treatments are repeated so that a new powder layer 24 is formed and the molding liquid 28 is discharged to the powder layer 24 by the following series of treatments before the surface of the dots 30 is dried. Control the timing.

By controlling the modeling device 12 so that the information processing device 14 repeats the above series of processes, the powder layer 24 on which the dots 30 are formed is laminated on the modeling unit 22, and the dots 30 are formed in the powder layer 24. The formed regions are combined to form a three-dimensional model 31.

Next, the flow of modeling the three-dimensional model will be described in more detail. FIG. 3 is a schematic view showing an example of the flow of modeling of a three-dimensional modeled object.

When the shaped solution 28 to the powder layer 24 ₁ formed by the flattened section 16 is discharged, the powder layer 24 ₁ dot 30 ₁ (dot 30) is formed (see Figure 3 (A)). Then, further formed powder layer 24 ₂ on the powder layer 24 ₁ formed of dots 30 ₁ (see FIG. 3 (B)), a powder layer 24 ₂ into shaped liquid 28 is ejected by dot 30 ₂ Is formed (see FIG. 3C).

Furthermore, the powder layer 24 ₃ is formed on the powder layer 24 ₂ formed of dots 30 _2, shaped liquid 28 to the powder layer 24 ₃ is discharged by dots 30 ₃ is formed (FIG. 3 (D )reference).

The powder 20 contained in the _{dots 30 (dots 30 1} to 30 ₃ ) produced by the modeling liquid 28 discharged into each of the powder layers 24 (powder layer 24 ₁ to powder layer 24 _{3) is the powder 20.} At least a part of the coating layer of the above dissolves and binds to each other. Therefore, before the surface of the dots 30 formed on the powder layer 24 is dried, the next powder layer 24 is formed and the dots 30 are formed on the powder layer 24, so that each powder is formed. The dot region formed by the dots 30 formed on the layer 24 is a continuously solidified region. This continuously solidified region (in FIG. 3, the region formed by dots 30 ₁ to 30 ₃ ) becomes the three-dimensional model 31.

In addition, in FIG. 3A to FIG. 3D, the case where one dot 30 is formed by overlapping in the thickness direction of the powder layer 24 is shown as an example. However, a plurality of dots 30 may be formed along the horizontal direction (plane in the first directions X and Y directions) of the powder layer 24 depending on the object to be modeled (see FIG. 3E).

Here, when the information processing apparatus 14 receives a stop signal indicating that the operation is stopped while a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the modeling liquid 28 are repeated. There is.

There are various causes of operation stoppage. The cause of the operation stop is, for example, when the maintenance unit 29 maintains the discharge unit 26, or when the user gives an operation instruction of the UI unit 36 to instruct an emergency stop.

When the information processing device 14 receives the stop signal, the information processing device 14 stops a series of processes. Then, when the cause of the operation stop indicated by the stop signal is eliminated, the information processing apparatus 14 resumes a series of processes.

At this time, the dots 30 formed by the molding liquid 28 discharged to the powder layer 24 before the series of treatments are stopped, and the molding liquid 28 discharged onto the newly formed powder layer 24 after the series of treatments are restarted. The dots 30 and the dots may not be combined and may be discontinuous.

FIG. 4 is a schematic diagram showing an example of a phenomenon in which the dots 30 between the powder layers 24 are discontinuous.

For example, when modeling liquid 28 is discharged to the powder layer 24 ₁ formed by the flattened section 16, the powder layer 24 ₁ dot 30 ₁ (dot 30) is formed (see FIG. 4 (A) ). The powder layer 24 further powder layer 24 ₂ on ₁ is formed (see FIG. 4 (B)), a powder layer 24 ₂ into shaped liquid 28 is ejected by dot 30 ₂ is formed (FIG. 4 ( See C)).

At this stage, it is assumed that the information processing apparatus 14 controls to stop a series of processes. Then, to the extent the powder layer 24 ₂ to form dots 30 ₂ surface before the operation has stopped, comprising the dot 30 ₃ of the powder layer 24 ₃ to be formed later operation restart discontinuous powder layer 24 ₂ It may penetrate or become dry (see FIG. 4 (D)).

In this state, as the information processing apparatus 14 is controlled to resume the series of processes, the powder layer 24 ₃ is formed on the powder layer 24 _2, forms a dot 30 ₃ to the powder layer 24 ₃ Suppose you have controlled. Then, the dot 30 ₂ formed on the powder layer 24 ₂ prior to the operation stop, the dot 30 ₃ formed in the powder layer 24 ₃ after operation restart, without binding, these dots 30 (dots 30 ₂ A gap P may be formed between the dots 30 and ₃ ), and these dots 30 may be discontinuous (see FIG. 4 (E)).

In this way, the dots 30 formed by the molding liquid 28 discharged onto the powder layer 24 before the series of treatments are stopped, and the molding liquid newly formed on the powder layer 24 after the series of treatments are restarted. In some cases, the dots 30 formed by 28 and the dots 30 are not combined and become discontinuous. For this reason, conventionally, if the operation is stopped during a series of processes for modeling the three-dimensional model 31, the strength of the modeled three-dimensional object 31 is reduced.

Therefore, in the three-dimensional modeling apparatus 10 of the present embodiment, the information processing apparatus 14 performs unique control.

FIG. 5 is a functional block diagram of the three-dimensional modeling apparatus 10 of the present embodiment. The three-dimensional modeling device 10 includes a UI unit 36, a storage unit 38, an information processing device 14, and a modeling device 12. The UI unit 36, the storage unit 38, and the modeling device 12 are connected to the information processing device 14 so that data and signals can be exchanged. The storage unit 38 stores various data.

The information processing device 14 is a computer configured to include a CPU (Central Processing Unit) and the like, and controls the entire three-dimensional modeling device 10. The information processing device 14 may be configured by a CPU other than a general-purpose CPU. For example, the information processing device 14 may be configured by a circuit or the like.

The information processing device 14 includes a reception unit 14A and a control unit 14B. Part or all of the reception unit 14A and the control unit 14B may be realized by, for example, a processing device such as a CPU executing a program, that is, by software, or by hardware such as an IC (Integrated Circuit). It may be realized by using software and hardware together.

The reception unit 14A receives a stop signal indicating that the operation is stopped and a restart signal indicating that the operation is resumed.

For example, the information processing device 14 controls the discharge unit 26 and the maintenance unit 29 so that the maintenance unit 29 performs maintenance on the discharge unit 26 at predetermined time intervals. This predetermined time may be appropriately determined according to the mechanism of the discharge unit 26, the type of the modeling liquid 28, the installation environment of the three-dimensional modeling device 10, and the like. Further, this predetermined time may be changed by an operation instruction of the UI unit 36 by the user.

Then, when the maintenance unit 29 starts the maintenance of the discharge unit 26 under the control of the information processing device 14, the maintenance unit 29 may transmit a stop signal indicating that the operation is stopped to the information processing device 14. In this case, the reception unit 14A receives the stop signal from the maintenance unit 29.

Further, when the maintenance of the discharge unit 26 is completed, the maintenance unit 29 transmits a restart signal indicating the restart of the operation to the information processing device 14. In this case, the reception unit 14A receives the operation restart signal from the maintenance unit 29.

Further, the reception unit 14A may receive a stop signal from the UI unit 36. The user operates a predetermined button or the like for instructing the stop of a series of processes in the UI unit 36. Then, the UI unit 36 transmits the stop signal to the information processing device 14. In this case, the reception unit 14A of the information processing device 14 receives the stop signal from the UI unit 36.

Further, the reception unit 14A receives a restart signal indicating the restart of operation from the UI unit 36. The user operates a predetermined button or the like for instructing the restart of the operation in the UI unit 36. Then, the UI unit 36 transmits the restart signal to the information processing device 14. In this case, the reception unit 14A of the information processing device 14 receives the restart signal from the UI unit 36.

In the present embodiment, the reception unit 14A will be described as receiving a stop signal and a restart signal from the maintenance unit 29 or the UI unit 36.

The control unit 14B controls the supply unit 18, the flattening unit 16, and the discharge unit 26 so as to repeat a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the molding liquid 28. .. Under the control of the control unit 14B, the three-dimensional model 31 corresponding to the object to be modeled is modeled.

Specifically, the control unit 14B generates print data capable of modeling the three-dimensional model 31 with the model device 12 from the image data indicating the object to be modeled. A known method may be used for generating the print data. The control unit 14B may acquire image data from an external device or the like via a communication line, or may acquire image data from the storage unit 38. Then, the control unit 14B may generate print data using the acquired image data.

The control unit 14B uses the print data to control the modeling device 12 so as to repeat the above series of processes according to the print data, so that the three-dimensional model 31 corresponding to the object to be modeled is modeled. 12 is controlled.

In the present embodiment, the control unit 14B stops a series of processes when the reception unit 14A receives the stop signal. Further, when the control unit 14B receives the stop signal and then the restart signal, at least the dot region formed by the dots 30 formed on the powder layer 24 on the surface of the powder layer 24 located on the outermost surface is at least. The supply unit 18, the flattening unit 16, and the discharge unit 26 are controlled so as to restart a series of processes after the molding liquid 28 is discharged onto a part of the surface.

FIG. 6 is a schematic view showing an example of the flow of modeling of a three-dimensional model when a series of processes is stopped and then restarted in the three-dimensional model device 10 of the present embodiment.

The powder 20 is supplied to the modeling unit 22 by the supply unit 18 and the flattening unit 16, and is flattened in the first direction X by the flattening unit 16, so that, for example, the first powder layer 24 (powder) It is assumed that the body layer 24 ₁ ) is formed (see FIG. 6 (A)).

Then, the discharge unit 26, the surface of the powder layer 24 _1, ejecting the shaped solution 28 to a position corresponding to the shaped object (see FIG. 6 (A)). As a result, _{dots 30 1} made of the molding liquid 28 _{are formed on the powder layer 24 1} (see FIG. 6 (B)).

Here, it is assumed that the reception unit 14A receives the stop signal.

Then, the control unit 14B stops a series of processes. Therefore, the shaping unit 22, the powder layer 24 ₁ in a state in which dots 30 ₁ is formed, shaped is suspended (see FIG. 6 (B)).

Then, the reception unit 14A receives the restart signal. Then, the control unit 14B includes the powder layer 24 _first surface located on the outermost surface, on at least a portion of the dot region in the dot 30 ₁ formed in the powder layer 24 _1, to discharge the shaped solution 28 The discharge unit 26 is controlled so as to (see FIG. 6C).

That is, the control unit 14B, upon receiving the restart signal after stopping a series of processing, before the formation of the next powder layer 24 _2, of the powder layer 24 ₁ located on the outermost surface which has already been formed at the surface, over at least a portion of the dot region in the dot 30 ₁ formed in the powder layer 24 _1, to discharge the shaped solution 28. As a result, _{a dot 32 is formed on the dot 30 1} by discharging a new modeling liquid 28 (see FIG. 6 (D)).

Thus, the previously formed stop the series of processes, the powder layer 24 _first surface located on the outermost surface, on the dots 30 ₁ corresponding to the print data of the shaped object, in the print data indicate The dots 32 that are not printed are formed so as to overlap each other (see FIG. 6 (D)).

Then, the control unit 14B controls the supply unit 18, the flattening unit 16, and the discharge unit 26 so as to restart a series of processes after forming the dots 32 by discharging the modeling liquid 28.

That is, under the control of the control unit 14B, the support member 22B moves the stage 22C in the vertical direction (direction of arrow ZB) by a predetermined amount (for example, an amount corresponding to the layer thickness J) (see FIG. 6E). As a result, a space for holding the powder 20 newly supplied from the supply unit 18 is formed on the opening side of the modeling tank 22A. Further, under the control of the control unit 14B, the support member 18B moves the stage 18C in the anti-vertical direction (direction of arrow ZA) by a predetermined amount (for example, an amount corresponding to the layer thickness J). As a result, a part of the powder 20 stored in the supply tank 18A protrudes from the opening side of the supply tank 18A (see FIG. 6E).

Then, the flattening unit 16 moves in the first direction X from the initial position on the upstream side of the first direction X from the supply unit 18 toward the downstream side of the first direction X under the control of the control unit 14B. .. As a result, the powder 20 protruding from the opening of the supply tank 18A is supplied to the modeling unit 22 (see FIGS. 6 (E) and 6 (F)).

Then, the flattening portion 16 further moves to the downstream side in the first direction X. Thus, flattening unit 16 is planarized by leveling the surface of the powder 20 supplied to the shaping part 22 in the first direction X, to form a powder layer 24 ₂ having a thickness of J (FIG. 6 (F)). Then, as in FIG. 6 (A), the powder layer 24 ₂ to the shaping fluid 28 is discharged, the series of processing is repeated.

FIG. 7 is an explanatory diagram of the states of the dots 30 and 32 when the series of processes in the three-dimensional modeling apparatus 10 of the present embodiment is stopped and then restarted.

When modeling liquid 28 is discharged is formed on the powder layer 24 _1, the powder layer 24 ₁ dot 30 ₁ (dot 30) is formed (see FIG. 7 (A)). The powder layer 24 further powder layer 24 ₂ on ₁ is formed (see FIG. 7 (B)), a powder layer 24 ₂ into shaped liquid 28 is ejected by dot 30 ₂ is formed (FIG. 7 ( See C)).

At this stage, it is assumed that the control unit 14B controls to stop a series of processes. Then, during operation stop, to the extent the powder layer 24 _two dots 30 ₂ formed is made a dot 30 ₃ by molding liquid 28 to be subsequently formed is discharged into the powder layer 24 ₃ discontinuous, it may become osmosis or dry state to a powder layer 24 ₂ (see FIG. 7 (D)).

As described above, in this embodiment, the control unit 14B, during operation restart, before resuming a series of processes, further discharging the shaped solution 28 onto the dot 30 ₂ of the powder layer 24 _2, the dots 32 Form (see FIG. 7 (E)).

At this time, the discharge amount of the modeling liquid 28 discharged for forming the dots 32 is larger than 0, and the droplets (dots 32) formed by the modeling liquid 28 having a thickness T equal to or less than the layer thickness J of the powder layer 24 restart the operation. sometimes may be any amount present on the surface of the powder layer 24 2 _(powder layer 24 of the outermost surface before the operation was stopped).

The discharge amount of the modeling liquid 28 to be discharged for forming the dots 32 is a new powder layer formed by the droplets (dots 32) formed by the modeling liquid 28 having the thickness T in a series of treatments immediately after resuming the operation. when modeling liquid 28 is discharged to 24 _3, it is preferable that the amount present on the surface of the powder layer 24 2 _(operation stop before the powder layer of the outermost surface 24).

Then, the control unit 14B controls to restart a series of processes. Therefore, on the dot 32, so that the new powder layer 24 ₃ and the dot 30 ₃ is formed (see FIG. 7 (F)).

Thus, the dots 30 by molding liquid 28 discharged into the powder layer 24 before stopping the series of processing (FIG. 7, the dots 30 _2), the powder layer 24 which is newly formed after a series of processes resumption The dots 30 produced by the discharged molding liquid 28 (dots 30 _{3 in} FIG. 7) are combined with each other via the dots 32 produced by the discharged molding liquid 28 after the series of treatments are stopped and before the series of treatments are restarted. , It becomes a continuous state.

Therefore, in the modeling apparatus 12 of the present embodiment, it is possible to suppress a decrease in the strength of the three-dimensional model 31 to be modeled even when a series of processes is stopped during the modeling.

The discharge region of the modeling liquid 28, which is discharged when the restart signal is received after receiving the stop signal, is formed on the powder layer 24 on the surface of the powder layer 24 located on the outermost surface already formed. It may be on at least a part of the dot region formed by the formed dots 30.

FIG. 8 is an explanatory diagram of a discharge region of the modeling liquid 28, which is discharged when the restart signal is received after receiving the stop signal.

For example, it is assumed that when the control unit 14B receives the stop signal, the dot region Q formed by the dots 30n is formed on the powder layer 24n located on the outermost surface that has already been formed (see FIG. 8A). ).

In this case, when the restart signal is received after stopping the series of processing, the control unit 14B is, for example, formed by the dots 30n formed on the powder layer 24n on the surface of the powder layer 24n located on the outermost surface. The molding liquid 28 may be discharged onto a part of the dot region QA (see FIG. 8B).

When the control unit 14B receives the restart signal after stopping the series of processing, the dot region Q of the dots 30n formed on the powder layer 24n on the surface of the powder layer 24n located on the outermost surface. It is preferable to discharge the molding liquid 28 onto the region QB inside the outer periphery of the above (see FIG. 8C).

For example, on the surface of the powder layer 24n located on the outermost surface, the dot region Q formed by the dots 30n formed on the powder layer 24n is a region formed by a plurality of dots 30n along the horizontal plane (XY plane). Suppose there is. In this case, it is preferable that the control unit 14B discharges the modeling liquid 28 onto the dots 30n inside the dots 30n arranged in a row along the outer circumference of the dot region Q.

When the control unit 14B receives the restart signal after stopping the series of processing, the dot region Q of the dots 30n formed on the powder layer 24n on the surface of the powder layer 24n located on the outermost surface. The molding liquid 28 may be discharged above (that is, a region corresponding to the dot region Q).

When the control unit 14B receives the restart signal after stopping the series of processes, the discharge amount of the modeling liquid 28 discharged to the surface of the powder layer 24n located on the outermost surface is 0 as described above. The amount of droplets (dots 32) formed by the modeling liquid 28 having a thickness T of a larger layer thickness J or less may be an amount existing on the surface when the operation is restarted.

Further, it is preferable that the control unit 14B adjusts the discharge amount of the modeling liquid 28 according to the waiting time from receiving the stop signal to receiving the restart signal so as to satisfy such a thickness T.

For example, the control unit 14B stores in advance the relationship between the standby time and the discharge amount of the molding liquid 28 to be discharged to the outermost powder layer 24n after receiving the stop signal in the storage unit 38. This discharge amount is the discharge amount per discharge of the modeling liquid 28 discharged to the outermost powder layer 24n after receiving the stop signal from the nozzle.

The modeling device 12 measures in advance the waiting time from the reception of the stop signal to the reception of the restart signal and the discharge amount of the modeling liquid 28 for realizing the thickness T by using the three-dimensional modeling device 10. Then, the control unit 14B of the modeling device 12 may store the standby time and the discharge amount in the storage unit 38 in advance in association with each other.

FIG. 9 is an explanatory diagram of an example of the relationship between the standby time and the discharge amount. FIG. 9A is a diagram 60 showing an example of the relationship between the standby time and the discharge amount. In FIG. 9A, t1, t2, and t3 indicate the waiting time t. Further, t1, t2, and t3 have a relationship of 0 <t1 <t2 <t3.

For example, the discharge amount of the modeling liquid 28 required to realize the thickness T increases until the waiting time reaches a certain time. However, after a certain period of time, the discharge amount for achieving the thickness T may be a small discharge amount.

Specifically, in FIG. 9A, during the period when the standby time t is 0 or more and less than t1, the control unit 14B still has droplets (dots 32) of the molding liquid 28 on the surface of the powder layer 24. Judge that there is. Therefore, during this period (0 ≦ t <t1), the control unit 14B controls the supply unit 18 and the flattening unit 16, and the powder is placed on the powder layer 24 without discharging the modeling liquid 28. 20 is supplied.

Then, during the period when the standby time t is t1 or more and less than t2, the control unit 14B determines that the droplets (dots 32) of the modeling liquid 28 do not exist on the surface of the powder layer 24. Specifically, the control unit 14B determines that the droplets (dots 32) formed by the modeling liquid 28 having a thickness T do not exist on the surface of the outermost powder layer 24 before the operation is stopped.

Here, the surface (powder surface) of the powder layer 24 is dried. Therefore, the control unit 14B controls the discharge unit 26 so as to discharge the modeling liquid 28 before the formation of the next powder layer 24. Further, when the waiting time t is long, the region to be dried (the region in the thickness direction of the powder layer 24) increases. In order for the droplets (dots 32) formed by the modeling liquid 28 having a thickness T to exist in the dry region of the powder layer 24, it is necessary to increase the discharge amount of the modeling liquid 28. Therefore, the control unit 14B controls the discharge unit 26 so that the discharge amount of the modeling liquid 28 increases as the standby time t increases from the standby time t1 to the standby time t2.

However, when the standby time t exceeds the standby time t2, the powder 20 reacts with the modeling liquid 28 and begins to solidify. FIG. 9B is an explanatory diagram of a state in which the powder 20 reacts with the modeling liquid 28 and begins to solidify. As shown in FIG. 9B, the modeling liquid 28 is liquid-crosslinked between the powders 20 (between the powders 20A and the powders 20B). When solidified in this liquid-crosslinked state, the surface of the powder 20 becomes like a wall. That is, a liquid crosslinked wall is formed near the surface of the powder layer 24.

In this way, since a liquid cross-linked wall is formed near the surface of the powder layer 24, even if a large amount of the modeling liquid 28 is discharged onto the powder layer 24, the modeling liquid 28 does not permeate into the powder layer 24. In other words, when the waiting time t2 is exceeded, the area where the liquid cross-linking wall is formed gradually increases. Therefore, the discharge amount required for the droplets (dots 32) of the modeling liquid 28 having the thickness T to exist on the surface of the powder layer 24 decreases from the standby time t2 toward the standby time t3. Therefore, the control unit 14B controls the discharge unit 26 so as to reduce the discharge amount of the modeling liquid 28 during the period of the standby time t2 or more and less than the standby time t3.

When the standby time t becomes the standby time t3 or more, the reaction between the powder 20 and the modeling liquid 28 is completed. Therefore, as shown in FIG. 9A, the discharge amount required for the droplets (dots 32) of the modeling liquid 28 having a thickness T to exist on the surface of the powder layer 24 is substantially constant. .. Therefore, the control unit 14B controls the discharge unit 26 so that the discharge amount of the modeling liquid 28 is substantially constant during the period of the standby time t3 or more.

The standby times t1, t2, and t3 may be measured in advance. Further, the control unit 14B of the modeling apparatus 12 may store the standby time and the discharge amount represented by the diagram 60 of FIG. 9A in advance in the storage unit 38 in association with each other. Then, the control unit 14B reads the discharge amount corresponding to the standby time from the storage unit 38, stops the series of processes, and then discharges the discharge amount to the surface of the powder layer 24 located on the outermost surface when the restart signal is received. It may be used as the discharge amount of the liquid 28.

Further, when the control unit 14B receives the restart signal after stopping the series of processes, the control unit 14B discharges the molding liquid 28 discharged to the surface of the powder layer 24 located on the outermost surface in a plurality of times. , It is preferable to control the discharge unit 26.

FIG. 10 is a schematic view showing an example of the state of the powder layer 24 when the modeling liquid 28 is discharged. On the surface of the powder layer 24, the molding liquid 28 discharged by the discharge unit 26 may reach the surface of the powder layer 24, so that the powder 20 of the powder layer 24 may fly up. This is because the larger the discharge amount of the discharged portion 26 at one time, the larger the amount of the powder 20 soaring up.

Specifically, the amount of the powder 20 that soars when the large droplet modeling liquid 28 is discharged to the powder layer 24 (see FIG. 10 (A)) is such that the small droplet modeling liquid 28 is transferred to the powder layer 24. It is larger than the amount of powder 20 that soars when discharged (see FIG. 10B).

Therefore, when the control unit 14B receives the restart signal after stopping the series of processes, the control unit 14B discharges the molding liquid 28 discharged to the surface of the powder layer 24 located on the outermost surface in a plurality of times. In addition, it is preferable to control the discharge unit 26.

Next, the procedure of the modeling process executed by the information processing apparatus 14 of the present embodiment will be described. FIG. 11 is a flowchart showing an example of the procedure of the modeling process.

First, the control unit 14B generates print data capable of modeling a three-dimensional model by the modeling device 12 from the image data indicating the object to be modeled (step S102). Then, the control unit 14B controls the modeling device 12 by controlling the modeling device 12 using the print data so as to model the three-dimensional model 31 corresponding to the object to be modeled.

Specifically, the control unit 14B controls the supply unit 18 so as to supply the powder 20 (step S104). In the present embodiment, the control unit 14B controls to supply the powder 20 by controlling the drive of the flattening unit 16, the drive of the support member 18B of the supply unit 18, and the drive of the support member 22B. To do. By the process of step S104, the powder 20 is supplied to the modeling unit 22.

Next, the control unit 14B controls the flattening unit 16 so as to form the powder layer 24 (step S106). In the present embodiment, the control unit 14B flattens the surface of the powder 20 supplied to the modeling unit 22 by controlling the flattening unit 16 to flatten the surface of the powder 20 in the first direction X, thereby flattening the layer thickness. It is controlled so as to form the powder layer 24 of J. The powder layer 24 is formed by the process of step S106.

Next, the control unit 14B controls the discharge unit 26 so as to discharge the modeling liquid 28 (step S108). In the present embodiment, the control unit 14B discharges the modeling liquid 28 at a position on the surface of the powder layer 24 according to the object to be modeled according to the print data generated in step S102 to form the dots 30. As described above, the discharge unit 26 is controlled. By the process of step S108, the molding liquid 28 is discharged to the powder layer 24, and the dots 30 are formed.

Next, the control unit 14B determines whether or not to end the series of processes of steps S104 to S108 (step S110). The control unit 14B determines in step S110 by determining the number of times required to form the three-dimensional model according to the print data generated in step S102 and whether or not a series of processes have been repeated.

If a negative determination is made in step S110 (step S110: No), the process returns to step S104. On the other hand, if an affirmative judgment is made in step S110 (step S110: Yes), this routine ends.

In the information processing apparatus 14 of the present embodiment, the interrupt process shown in FIG. 12 is executed during the execution of the process shown in FIG. FIG. 12 is a flowchart showing an example of the interrupt processing procedure.

First, the reception unit 14A determines whether or not the stop signal indicating the operation stop has been received (step S200). If a negative determination is made in step S200 (step S200: No), this routine ends.

On the other hand, if an affirmative judgment is made in step S200 (step S200: Yes), the process proceeds to step S202. In step S202, the control unit 14B controls the modeling device 12 so that the discharge control of the modeling liquid 28 by the discharge unit 26 in the series of processes currently being processed is completed (step S202).

Next, the control unit 14B starts the standby time timer (step S204). As described above, the standby time is the standby time from the reception of the stop signal to the reception of the restart signal. In this routine, as an example, the standby time will be described as the time from the end of a series of processes currently being processed to the reception of the restart signal after the stop signal is received.

Next, the control unit 14B controls the modeling device 12 so as to stop a series of processes (step S206).

Next, the control unit 14B determines whether or not the stop signal received in step S200 is a stop signal due to maintenance (step S208). In step S208, the control unit 14B determines in step S208 by determining whether or not a stop signal has been received from the maintenance unit 29.

If an affirmative judgment is made in step S208 (step S208: Yes), the process proceeds to step S210. Then, the control unit 14B controls the maintenance unit 29 so as to start the maintenance of the discharge unit 26 (step S210). By the process of step S210, the maintenance of the discharge unit 26 by the maintenance unit 29 is started. Then, the process proceeds to step S212.

On the other hand, if a negative determination is made in step S208 (step S208: No), the process proceeds to step S212.

In step S212, the negative determination (step S212: No) is repeated until the reception unit 14A determines that the restart signal has been received (step S212: Yes). If an affirmative judgment is made in step S212 (step S212: Yes), the process proceeds to step S214.

In step S214, the control unit 14B stops the timer started in step S204 (step S214). Next, the control unit 14B calculates the standby time by calculating the elapsed time from the start of the timer in step S204 to the stop of the timer in step S214 (step S216).

Next, the control unit 14B reads the discharge amount corresponding to the standby time calculated in step S216 from the storage unit 38 (step S218). Then, the control unit 14B reads in step S218 on at least a part of the dot region formed by the dots 30 formed on the powder layer 24 on the surface of the powder layer 24 located on the outermost surface already formed. The molding liquid 28 of the discharged amount is discharged (step S220).

Then, the control unit 14B controls the modeling device 12 so as to restart a series of processes (step S222). The process of step S222 is the process of steps S104 to S110 in FIG. Then, this routine is terminated.

As described above, the three-dimensional modeling apparatus 10 of the present embodiment includes a supply unit 18, a flattening unit 16, a discharge unit 26, a control unit 14B, and a reception unit 14A. The supply unit 18 supplies the powder 20. The flattening portion 16 flattens the surface of the supplied powder 20 by leveling it in the first direction X to form the powder layer 24. The discharge unit 26 discharges the modeling liquid 28 at a position on the surface of the powder layer 24 according to the object to be modeled to form the dots 30.

The control unit 14B controls the supply unit 18, the flattening unit 16, and the discharge unit 26 so as to repeat a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the modeling liquid 28. As a result, the three-dimensional model 31 corresponding to the object to be modeled is modeled. The reception unit 14A receives a stop signal indicating that the operation is stopped and a restart signal indicating that the operation is resumed.

The control unit 14B stops a series of processes when the stop signal is received, and when the restart signal is received after receiving the stop signal, the powder layer on the surface of the powder layer 24 located on the outermost surface. The supply unit 18, the flattening unit 16, and the discharge unit 26 are controlled so as to restart a series of processes after discharging the modeling liquid 28 onto at least a part of the dot region Q formed by the dots 30 formed on the 24. ..

As described above, in the three-dimensional modeling apparatus 10 of the present embodiment, the dot region formed by the dots 30 formed on the outermost powder layer 24 already formed before restarting the series of processing by receiving the restart signal. After discharging the modeling liquid 28 onto at least a part of Q, a series of processes is restarted.

Therefore, the dots 30 formed on the powder layer 24 before the series of treatments are stopped, and the dots 30 formed by the molding liquid 28 discharged onto the powder layer 24 newly formed after the series of treatments are restarted. However, after the series of treatments is stopped and before the series of treatments are restarted, they are combined with each other via the dots 32 by the molding liquid 28 discharged to be in a continuous state (see FIG. 7).

Therefore, in the modeling device 12 of the present embodiment, even if a series of operations is stopped and then restarted during modeling of the three-dimensional model 31, the decrease in strength of the three-dimensional object 31 to be modeled is suppressed. Can be done.

Therefore, the modeling device 12 of the present embodiment can suppress the decrease in strength of the three-dimensional model 31.

Further, when the control unit 14B receives the stop signal and then the restart signal, the dot region Q of the dots 30 formed on the powder layer 24 on the surface of the powder layer 24 located on the outermost surface. It is preferable to control the supply unit 18, the flattening unit 16, and the discharge unit 26 so that a series of processes are restarted after the molding liquid 28 is discharged a plurality of times onto at least a part of the molding liquid 28.

Further, when the control unit 14B receives the stop signal and then the restart signal, the discharge amount of the droplets of the modeling liquid 28 having a thickness greater than 0 and a layer thickness J or less is present on the surface when the operation is restarted. The supply unit 18, the flattening unit 16, and the discharge unit 18 so as to restart the series of processes after discharging the modeling liquid 28 of No. 28 onto at least a part of the dot region Q formed by the dots 30 formed on the powder layer 24. It is preferable to control the unit 26.

Further, when the control unit 14B receives the stop signal and then the restart signal, the dot region Q of the dots 30 formed on the powder layer 24 on the surface of the powder layer 24 located on the outermost surface. The supply unit 18 is flat so as to restart a series of processes after discharging the molding liquid 28 having a discharge amount corresponding to the waiting time from receiving the stop signal to receiving the restart signal on at least a part of the liquid. It is preferable to control the chemical conversion unit 16 and the discharge unit 26.

Further, when the control unit 14B receives the stop signal and then the restart signal, the dot region Q of the dots 30 formed on the powder layer 24 on the surface of the powder layer 24 located on the outermost surface. It is preferable to control the supply unit 18, the flattening unit 16, and the discharge unit 26 so as to restart a series of processes after discharging the modeling liquid 28 onto the region inside the outer periphery.

Further, in the three-dimensional modeling method of the present embodiment, the surface of the supply unit 18 for supplying the powder 20 and the surface of the supplied powder 20 are flattened by leveling in the first direction X, and the powder layer 24 is flattened. Is executed by the three-dimensional modeling apparatus 10 including the flattening portion 16 for forming the powder layer 24 and the ejection portion 26 for discharging the modeling liquid 28 at a position corresponding to the object to be modeled on the surface of the powder layer 24 to form the dots 30. It is a three-dimensional modeling method. In the three-dimensional modeling method of the present embodiment, the supply unit 18, the flattening unit 16, and the discharge are repeated so as to repeat a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the modeling liquid 28. A control step of forming a three-dimensional model 31 corresponding to the object to be modeled by controlling the unit 26, a stop signal indicating an operation stop, and a reception step of receiving a restart signal indicating the restart of the operation are included. The control step includes a step of stopping a series of processes when a stop signal is received, and a step of stopping the powder on the surface of the powder layer 24 located on the outermost surface when a restart signal is received after receiving the stop signal. The supply unit 18, the flattening unit 16, and the discharge unit 26 are controlled so as to restart a series of processes after discharging the modeling liquid 28 onto at least a part of the dot region Q formed by the dots 30 formed on the layer 24. Including steps to do.

Further, in the three-dimensional modeling program of the present embodiment, the surface of the supply unit 18 for supplying the powder 20 and the surface of the supplied powder 20 are flattened by leveling in the first direction X, and the powder layer 24 is flattened. Controls a modeling device 12 including a flattening unit 16 for forming a dot 30 and a discharging unit 26 for forming dots 30 by discharging a modeling liquid 28 at a position on the surface of the powder layer 24 according to an object to be modeled. It is a three-dimensional modeling program that is executed by a computer. In the three-dimensional modeling program of the present embodiment, the supply unit 18, the flattening unit 16, and the discharge unit 18 are repeated so as to repeat a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the modeling liquid 28. The unit 26 includes a control step of modeling the three-dimensional model 31 corresponding to the object to be modeled, a stop signal indicating stop of operation, and a reception step of receiving a restart signal indicating restart of operation. The control step includes a step of stopping a series of processes when a stop signal is received, and a step of stopping the powder on the surface of the powder layer 24 located on the outermost surface when a restart signal is received after receiving the stop signal. The supply unit 18, the flattening unit 16, and the discharge unit 26 are controlled so as to restart a series of processes after discharging the modeling liquid 28 onto at least a part of the dot region Q formed by the dots 30 formed on the layer 24. Including steps to do.

Further, in the information processing apparatus 14 of the present embodiment, the supply unit 18 for supplying the powder 20 and the surface of the supplied powder 20 are flattened by leveling in the first direction X to flatten the powder layer. Controls a modeling device 12 including a flattening unit 16 that forms 24 and a discharge unit 26 that discharges a modeling liquid 28 at a position on the surface of the powder layer 24 according to an object to be modeled to form dots 30. Information processing device 14 for processing. The information processing device 14 includes a reception unit 14A and a control unit 14B.

The control unit 14B controls the supply unit 18, the flattening unit 16, and the discharge unit 26 so as to repeat a series of processes of supplying the powder 20, forming the powder layer 24, and discharging the modeling liquid 28. As a result, the three-dimensional model 31 corresponding to the object to be modeled is modeled. The reception unit 14A receives a stop signal indicating that the operation is stopped and a restart signal indicating that the operation is resumed.

The control unit 14B stops a series of processes when the stop signal is received, and when the restart signal is received after receiving the stop signal, the powder layer on the surface of the powder layer 24 located on the outermost surface. The supply unit 18, the flattening unit 16, and the discharge unit 26 are controlled so as to restart a series of processes after discharging the modeling liquid 28 onto at least a part of the dot region Q formed by the dots 30 formed on the 24. ..

Next, the powder 20 and the modeling liquid 28 used in the present embodiment will be specifically described.

<Powder>
The powder 20 has a structure in which the surface of a particulate base material is covered with a coating layer. The powder 20 may further contain other components and the like.

-Base material-
First, the base material will be described. The base material is in the form of powder or particles. The material of the base material is, for example, metal, ceramics, carbon, polymer, wood, biocompatible material, sand and the like. From the viewpoint of producing a three-dimensional model 31 having higher strength, it is preferable to use a metal capable of sintering treatment or ceramics as the base material.

The metal is, for example, stainless steel (SUS) steel, iron, copper, titanium, silver and the like. The stainless steel (SUS) steel is, for example, SUS316L or the like. Ceramics are, for example, metal oxides and the like. Specifically, the ceramics are silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₂ ), titania (TIO ₂ ) and the like. The carbon is, for example, graphite, graphene, carbon nanotubes, carbon nanohorns, fullerenes and the like.

The polymer is, for example, a known resin that is insoluble in water. The wood is, for example, wood chips, cellulose and the like. The biocompatible material is, for example, polylactic acid, calcium phosphate, or the like.

The base material may be composed of one of the above materials, or may be a mixture of a plurality of the above materials.

Further, as the base material, commercially available particles or powder composed of the above materials may be used. For example, as commercially available products, SUS316L (manufactured by Sanyo Special Steel Co., Ltd., PSS316L), SiO ₂ (manufactured by Tokuyama Corporation, Excelica SE-15K), AlO ₂ (manufactured by Taimei Chemicals Co., Ltd., Tymicron TM-5D), Examples _{include ZrO 2} (manufactured by Tosoh Corporation, TZ-B53).

The surface of the base material may be subjected to a known surface (modification) treatment from the viewpoint of enhancing the affinity with the coating layer described later that covers the surface of the base material.

The average particle size of the base material can be appropriately selected depending on the intended purpose, and is not particularly limited. The average particle size of the base material is, for example, 0.1 μm or more and 500 μm or less, more preferably 5 μm or more and 300 μm or less, and further preferably 15 μm or more and 250 μm or less.

When the average particle size of the base material is 0.1 μm or more and 500 μm or less, the production efficiency of the three-dimensional model 31 is excellent, and the handleability and handleability are good. When the average particle size of the base material is 500 μm or less, when the powder layer 24 is formed using the powder 20, the filling rate of the powder 20 in the powder layer 24 is improved, and the obtained three-dimensional molded product is obtained. It is difficult for voids and the like to occur in 31.

The average particle size of the base material can be measured according to a known method using a known particle size measuring device, for example, Microtrac HRA (manufactured by Nikkiso Co., Ltd.).

The particle size distribution of the base material can be appropriately selected depending on the intended purpose, and is not particularly limited. The outer shape, surface area, circularity, fluidity, wettability, etc. of the base material can also be appropriately selected depending on the intended purpose and are not particularly limited.

-Coating layer-
Next, the coating layer covering the surface of the base material will be described. The coating layer may be a layer having a function of being dissolved by the modeling liquid 28 and then solidified, and may be adjusted according to the type of the modeling liquid 28.

For example, the coating layer is preferably made of an organic material.

The organic material preferably has a property of being soluble in the modeling liquid 28 and capable of cross-linking by the action of a cross-linking agent or the like contained in the modeling liquid 28.

Dissolving in the modeling liquid 28 means that, for example, when 1 g of the organic material is mixed with 100 g of the solvent of the modeling liquid 28 at 30 ° C. and stirred, 90% by mass or more of the organic material is dissolved.

The organic material used for the coating layer preferably has a viscosity of a 4% by mass (w / w%) solution of the organic material at 20 ° C. of 40 mPa · s or less, and more preferably 1 mPa · s or more and 35 mPa · s or less. It is particularly preferably 5 mPa · s or more and 30 mPa · s or less.

When the viscosity of the organic material used for the coating layer is 40 mPa · s or less, the strength and dimensional accuracy of the three-dimensional model 31 formed from the dots 30 by the modeling liquid 28 discharged into the powder 20 are improved. The viscosity may be measured according to, for example, JIS K7117.

The organic material used for the coating layer may be any material having a function of being dissolved by the modeling liquid 28 and then solidified, and may be appropriately selected depending on the purpose, the type of the modeling liquid 28, and the like. However, the organic material used for the coating layer is preferably water-soluble from the viewpoint of handleability and environmental load. Such organic materials are, for example, water-soluble resins, water-soluble prepolymers, and the like.

When the powder 20 using a water-soluble organic material is used as the coating layer, an aqueous medium can be used as the modeling liquid 28. Further, if a water-soluble organic material is used as the coating layer, the organic material and the base material can be separated by water treatment when the powder 20 is discarded or recycled.

The water-soluble resin is, for example, polyvinyl alcohol resin, polyacrylic acid resin, cellulose resin, starch, gelatin, vinyl resin, amide resin, imide resin, acrylic resin, polyethylene glycol, and the like.

These water-soluble resins may be homopolymers (homopolymers), heteropolymers (copolymers), or modified as long as they are water-soluble. Further, the water-soluble resin may have a known functional group introduced therein, or may be in the form of a salt.

For example, when a polyvinyl alcohol resin is used for the coating layer, polyvinyl alcohol, modified polyvinyl alcohol with an acetoacetyl group, an acetyl group, silicone or the like (acetoacetyl group-modified polyvinyl alcohol, acetyl group-modified polyvinyl alcohol, silicone-modified polyvinyl alcohol, etc.) or , Butanediol vinyl alcohol copolymer or the like may be used.

When a polyacrylic acid resin is used for the coating layer, a salt such as polyacrylic acid or sodium polyacrylate may be used. When a cellulose resin is used for the coating layer, cellulose, carboxymethyl cellulose (CMC) or the like may be used. When an acrylic resin is used for the coating layer, for example, polyacrylic acid, acrylic acid / maleic anhydride copolymer, or the like may be used.

When a water-soluble prepolymer is used for the coating layer, for example, an adhesive water-soluble isocyanate prepolymer contained in a water blocking agent or the like may be used.

Examples of non-water-soluble organic materials and resins that can form a coating layer include acrylic, maleic acid, silicone, butyral, polyester, polyvinyl acetate, vinyl chloride / vinyl acetate copolymer, polyethylene, polypropylene, and polyacetal. Ethylene / vinyl acetate copolymer, ethylene / (meth) acrylic acid copolymer, α-olefin / maleic anhydride-based copolymer, esterified product of α-olefin / maleic anhydride-based copolymer, polystyrene, poly ( Meta) acrylic acid ester, α-olefin / maleic anhydride / vinyl group-containing monomer copolymer, styrene / maleic anhydride copolymer, styrene / (meth) acrylic acid ester copolymer, polyamide, epoxy resin, xylene resin , Ketone resin, petroleum resin, rosin or its derivative, Kumaron inden resin, terpene resin, polyurethane resin, styrene / butadiene rubber, polyvinyl butyral, nitrile rubber, acrylic rubber, synthetic rubber such as ethylene / propylene rubber, nitrocellulose, etc. Can be mentioned.

It is preferable to use an organic material having a crosslinkable functional group for the coating layer. The crosslinkable functional group can be appropriately selected depending on the intended purpose, and is not particularly limited. The crosslinkable functional group is, for example, a hydroxyl group, a carboxyl group, an amide group, a phosphoric acid group, a thiol group, an acetoacetyl group, an ether bond, or the like.

It is preferable to use an organic material having a crosslinkable functional group for the coating layer from the viewpoint that the organic material can be easily crosslinked to form a three-dimensional model 31 as a cured product.

As the organic material used for the coating layer, it is preferable to use a polyvinyl alcohol resin having an average degree of polymerization of 400 or more and 1,100 or less. Further, as the organic material used for the coating layer, it is preferable to use a modified polyvinyl alcohol resin in which a crosslinkable functional group is introduced into the molecule as described above. In particular, it is preferable to use an acetoacetyl group-modified polyvinyl alcohol resin for the coating layer.

For example, when a polyvinyl alcohol resin having an acetoacetyl group is used for the coating layer, the acetoacetyl group has a complicated three-dimensional network structure (crosslinked structure) via the metal due to the action of the metal in the crosslinking agent contained in the molding liquid 28. Can be easily formed (excellent in cross-linking reactivity). Therefore, the modeled three-dimensional model 31 has excellent bending strength.

As the polyvinyl alcohol resin having an acetoacetyl group (acetoacetyl group-modified polyvinyl alcohol resin), one having different characteristics such as viscosity and saponification may be used alone, or two or more thereof may be used in combination. Good. Further, it is more preferable to use an acetoacetyl group-modified polyvinyl alcohol resin having an average degree of polymerization of 400 or more and 1,100 or less for the coating layer.

As the organic material used for the coating layer, one of the above-mentioned materials may be used alone, two or more of them may be used in combination, or an appropriately synthesized material may be used, or a commercially available material may be used. It may be a product.

Commercially available products used for the coating layer include, for example, polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA-205C, PVA-220C), polyacrylic acid (manufactured by Toa Synthetic Co., Ltd., Julimer AC-10), sodium polyacrylate (Toa). Synthetic Co., Ltd., Julimer AC-103P), acetacetyl group-modified polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Gosenex Z-300, Gosenex Z-100, Gosenex Z-200, Gosenex Z-205, Gosenex Z-210 , Gosenex Z-220), carboxy group-modified polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Gosenex T-330, Gosenex T-350, Gosenex T-330T), butanediol vinyl alcohol copolymer (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) , Nichigo G-Polymer OKS-8041), Diacetone acrylamide-modified polyvinyl alcohol (manufactured by Nippon Vine Bi-Poval Co., Ltd., DF-05), Sodium carboxymethyl cellulose (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., cellogen 5A, cellogen 6A), Examples thereof include starch (manufactured by Sanwa Stardust Industry Co., Ltd., High Stard PSS-5) and gelatin (manufactured by Nitta Gelatin Co., Ltd., B-matrix gelatin).

The thickness of the coating layer is not limited, but for example, the average thickness is preferably 5 nm or more and 1,000 nm or less, preferably 5 nm or more and 500 nm or less, more preferably 50 nm or more and 300 nm or less, and particularly preferably 100 nm or more and 200 nm or less.

When the average thickness of the coating layer is 5 nm or more, the strength of the three-dimensional model 31 formed from the dots 30 by the modeling liquid 28 discharged into the powder 20 is improved. Further, when the average thickness of the coating layer is 1,000 nm or less, the dimensional accuracy of the three-dimensional model 31 formed from the dots 30 by the modeling liquid 28 discharged into the powder 20 is improved.

The average thickness of the coating layer is determined by, for example, embedding powder 20 in acrylic resin or the like, etching or the like to expose the surface of the base material, and then scanning a scanning tunneling microscope STM, an atomic force microscope AFM, or scanning. It can be measured by using a type electron microscope SEM or the like.

By using a material containing a cross-linking agent as the coating layer, the thickness of the coating layer can be made thinner than in the case where the cross-linking agent is not contained. That is, it is possible to reduce the thickness of the coating layer by utilizing the curing action of the cross-linking agent, and it is possible to realize both the strength and the accuracy of the three-dimensional model 31 to be modeled.

The coverage (area ratio) of the surface of the base material by the coating layer may be appropriately adjusted according to the purpose, and is not particularly limited. The coverage of the surface of the base material with the coating layer is, for example, preferably 15% or more, more preferably 50% or more, and particularly preferably 80% or more.

When the coverage is 15% or more, the strength of the three-dimensional model 31 formed from the dots 30 by the modeling liquid 28 discharged into the powder 20 is improved. Further, when the coverage is 15% or more, the dimensional accuracy of the three-dimensional model 31 formed from the dots 30 by the modeling liquid 28 discharged into the powder 20 is improved.

The coverage of the surface of the base material by the coating layer was determined by, for example, observing an electron micrograph of the powder 20 and covering the powder 20 shown in the photograph with the coating layer with respect to the entire surface area of the base material. Calculate the average value of the ratio (%) of the area of the part. Then, this average value may be used as the coverage. Further, the coverage may be measured by performing element mapping by energy dispersive X-ray spectroscopy such as SEM-EDS on the portion of the base material of the powder 20 covered with the coating layer.

The powder 20 may contain other components. Other components may be appropriately selected according to the purpose, and are not particularly limited. For example, other components include fluidizing agents, fillers, leveling agents, sintering aids, and the like.

By configuring the powder 20 to contain a fluidizing agent, the powder layer 24 can be easily and efficiently formed. By configuring the powder 20 to contain a filler, it is possible to suppress the generation of voids in the three-dimensional model 31 that has been modeled. Further, by configuring the powder 20 to contain a leveling agent, the wettability of the powder 20 can be improved and handling can be facilitated. By configuring the powder 20 to contain a sintering aid, it is possible to sinter at a lower temperature when the shaped three-dimensional model 31 is sintered.

-Powder manufacturing method-
The method for producing the powder 20 may be appropriately selected depending on the intended purpose, and is not particularly limited.

For example, the surface of the particles (or powder) of the base material may be coated with a coating layer using a known coating method. Known coating methods include, for example, a rolling flow coating method, a spray-drying method, a stirring and mixing addition method, a dipping method, a kneader coating method and the like. Further, these coating methods can be carried out by using various known commercially available coating devices, granulating devices and the like.

-Physical characteristics of powder-
The average particle size of the powder 20 may be appropriately adjusted according to the intended purpose and is not limited. The average particle size of the powder 20 is, for example, preferably 3 μm or more and 250 μm or less, more preferably 3 μm or more and 200 μm or less, further preferably 5 μm or more and 150 μm or less, and particularly preferably 10 μm or more and 85 μm or less.

When the average particle size of the powder 20 is 3 μm or more, the fluidity of the powder 20 is improved, the powder layer 24 is easily formed, and the smoothness of the surface of the powder layer 24 is improved. Therefore, it is possible to improve the modeling efficiency of the three-dimensional model 31 and improve the handleability and dimensional accuracy of the three-dimensional model 31.

When the average particle size of the powder 20 is 250 μm or less, the size of the space between the powders 20 in the powder layer 24 can be reduced. Therefore, the space ratio of the three-dimensional model 31 can be reduced, and the strength of the three-dimensional model 31 can be improved. From these viewpoints, the average particle size of the powder 20 is preferably 3 μm or more and 250 μm or less from the viewpoint of achieving both dimensional accuracy and strength.

The particle size distribution of the powder 20 can be appropriately selected depending on the intended purpose, and is not particularly limited.

The angle of repose of the powder 20 is preferably 60 degrees or less, more preferably 50 degrees or less, and even more preferably 40 degrees or less. When the angle of repose of the powder 20 is 60 degrees or less, the powder 20 can be efficiently and stably arranged at a desired place. The angle of repose can be measured using, for example, a powder property measuring device (Powder tester PT-N type, manufactured by Hosokawa Micron Co., Ltd.) or the like.

<Shaping liquid>
Next, the modeling liquid 28 used in the present embodiment will be described. The modeling liquid 28 may be any liquid having a function of dissolving the coating layer of the powder 20 and then solidifying it.

Therefore, the modeling liquid 28 may be appropriately adjusted according to the material of the coating layer of the powder 20 used for modeling. For example, the modeling liquid 28 contains a solvent that dissolves the coating layer of the powder 20.

The solvent constituting the modeling liquid 28 is not limited as long as it can dissolve the coating layer of the powder 20. For example, the solvent is water, alcohol such as ethanol, hydrophilic solvent such as ether and ketone, ether solvent such as aliphatic hydrocarbon and glycol ether, ester solvent such as ethyl acetate, ketone solvent such as methyl ethyl ketone, higher grade. For example, alcohol.

Among these, from the viewpoint of environmental load and discharge stability of the modeling liquid 28, it is preferable to use a hydrophilic solvent, and water is more preferable. The hydrophilic solvent may be a solvent in which water and a component other than water such as alcohol are mixed. When a hydrophilic solvent is used for the molding liquid 28, it is preferable that the constituent material of the coating layer of the powder 20 is mainly composed of a water-soluble organic material.

The hydrophilic solvent used in the modeling liquid 28 is, for example, water, alcohols such as ethanol, ethers, ketones, and the like. The hydrophilic solvent may be an organic solvent containing a component other than water such as alcohol.

The molding liquid 28 preferably contains a cross-linking agent that crosslinks the material constituting the coating layer of the powder 20. Further, the modeling liquid 28 may contain a solvent that dissolves the coating layer of the powder 20, a component that promotes dissolution by the solvent, a stabilizer that maintains the storage stability of the modeling liquid 28, and the like. Further, the modeling liquid 28 may be further contained with other components, if necessary.

When the molding liquid 28 containing a cross-linking agent is used, by discharging the molding liquid 28 into the powder 20, the coating layer (resin or the like contained in) of the powder 20 is dissolved in the molding liquid 28 and becomes into the molding liquid 28. Crosslink with the included crosslinker. As a result, in the powder 20, the region where the modeling liquid 28 is discharged is in a state where the coating layers of the powder 20 are connected to each other and solidified.

The cross-linking agent contained in the molding liquid 28 is not particularly limited as long as it has a property of being able to cross-link a resin such as an organic material contained in the coating layer of the powder 20, and can be appropriately selected depending on the intended purpose. .. The cross-linking agent is, for example, a metal salt, a metal complex, an organic zirconium-based compound, an organic titanium-based compound, a chelating agent, or the like.

Examples of the organic zirconium compound include zirconium acidified, zirconium ammonium carbonate, and zirconium lactate.

Examples of the organic titanium compound include titanium acylate and titanium alkoxide.

The metal salt is, for example, one that ionizes a divalent or higher cation metal in water. Specific examples of the metal salt include zirconium oxychloride octahydrate (tetravalent), aluminum hydroxide (trivalent), magnesium hydroxide (divalent), titanium lactate ammonium salt (tetravalent), and basic aluminum acetate. (Trivalent), zirconium ammonium carbonate (tetravalent), titanium triethanolaminate (tetravalent) and the like.

A commercially available product may be used as the metal salt. Commercially available products include, for example, zirconium oxychloride octahydrate (manufactured by Daiichi Rare Element Chemical Industries, Ltd., zirconium acidified), aluminum hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.), magnesium hydroxide (Wako Pure Chemical Industries, Ltd.). (Made by Kogyo Co., Ltd.), Titanium Lactate Ammonium Salt (Matsumoto Fine Chemical Industries, Ltd., Organix TC-300), Zirconium Lactate Ammonium Salt (Matsumoto Fine Chemical Industries, Ltd., Organics ZC-300), Basic Aluminum acetate (Wako Pure Chemical Industries, Ltd. (Manufactured by Kogyo Co., Ltd.), bisvinyl sulfone compound (manufactured by Fujifilm Fine Chemicals, Ltd., VSB (K-FJC)), ammonium carbonate, ammonium carbonate (manufactured by Daiichi Rare Element Chemical Industries, Ltd., Zircozol AC-20), titanium triethanol Aminet (manufactured by Matsumoto Fine Chemical Industries, Ltd., Organics TC-400) and the like can be mentioned.

Among these, the zirconium ammonium carbonate salt is more preferable in that the obtained three-dimensional model 31 is excellent in strength.

The molding liquid 28 may be configured to contain one type of cross-linking agent or may be configured to contain a plurality of types of cross-linking agents. Among the above, the cross-linking agent contained in the molding liquid 28 is more preferably a metal salt.

Further, the modeling liquid 28 preferably contains a surfactant. By including the surfactant, the surface tension of the modeling liquid 28 can be adjusted.

The surfactant is, for example, an anionic surfactant, a nonionic surfactant, or an amphoteric surfactant. It is preferable to select a surfactant that does not impair the dispersion stability by combining a wetting agent and a water-soluble organic solvent.

The viscosity of the modeling liquid 28 is not limited, but for example, the viscosity at 25 ° C. is preferably 25 mPa · s or less, and more preferably 3 mPa · s or more and 20 mPa · s or less. When the viscosity of the modeling liquid 28 at 25 ° C. is 25 mPa · s or less, the discharge unit 26 can stably discharge the modeling liquid 28, which is preferable.

Further, it is preferable that the viscosity change rate of the modeling liquid 28 before and after being left at 50 ° C. for 3 days is less than 20%. When the viscosity change rate of the modeling liquid 28 is 20% or more, the discharge of the modeling liquid 28 by the discharge unit 26 may become unstable.

Next, the hardware configuration of the information processing apparatus 14 according to the present embodiment will be described.

FIG. 13 is a hardware configuration diagram of the information processing device 14. The information processing device 14 includes a CPU 300, a ROM (Read Only Memory) 302, a RAM (Random Access Memory) 304, and an I / F (Interface) 306. The CPU 300, ROM 302, RAM 304, and I / F 306 are connected to each other by a bus 308, and have a hardware configuration using a normal computer.

The program for executing the modeling process executed by the information processing apparatus 14 of the present embodiment is provided by being incorporated in ROM 302 or the like in advance.

The program for executing the modeling process executed by the information processing device 14 of the present embodiment is a CD-ROM or a flexible disk (FD) in a file in a format that can be installed or executed in these devices. , CD-R, DVD (Digital Versail Disc), or the like, which may be recorded and provided on a computer-readable recording medium.

Further, the program for executing the modeling process executed by the information processing device 14 of the present embodiment is stored on a computer connected to a network such as the Internet and provided by downloading via the network. It may be configured. Further, the program for executing the modeling process executed by the information processing apparatus 14 of the present embodiment may be configured to be provided or distributed via a network such as the Internet.

The program for executing the modeling process executed by the information processing apparatus 14 of the present embodiment has a modular configuration including the above-mentioned parts. As actual hardware, when the CPU 300 reads and executes each program from a storage medium such as ROM 302, each of the above parts is loaded on the main storage device and generated on the main storage device.

Although the present embodiment has been described above, the above embodiment is presented as an example and is not intended to limit the scope of the invention. The new embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The above-described embodiment is included in the scope and gist of the invention, and is also included in the scope of the invention described in the claims and the equivalent scope thereof.

10 Three-dimensional modeling device 14 Information processing device 14A Reception unit 14B Control unit 16 Flattening unit 18 Supply unit 20 Powder 22 Modeling unit 26 Discharge unit

Japanese Unexamined Patent Publication No. 2000-15613

Claims (10)

The powder layer forming unit for forming a powder layer,
A discharge portion that discharges a molding liquid onto the surface of the powder layer to form dots, and a discharge portion.
With
When the operation related to the formation of the powder layer or the discharge of the modeling liquid is stopped and restarted , at least one of the dot regions formed by the dots formed on the outermost surface of the powder layer before the operation is stopped. the shaped liquid from the discharge portion on part said powder layer after being discharged is formed,
A three-dimensional modeling device characterized by this. The modeling liquid is discharged onto a region inside the outer circumference of the dot region formed by the dots formed on the outermost powder layer.
The three-dimensional modeling apparatus according to claim 1. The discharge amount to the dot region is an amount in which droplets of the modeling liquid having a thickness equal to or less than the layer thickness of the powder layer are present on the surface of the powder layer.
The three-dimensional modeling apparatus according to claim 1 or 2, wherein the three-dimensional modeling apparatus is characterized in that. The discharge amount of the modeling liquid discharged from the discharge unit differs depending on the waiting time from the stop to the restart of the operation.
It stereolithography apparatus according to any one of claims 1 to claim 3, characterized in. The longer the waiting time, the larger the discharge amount, and when the standby time exceeds a predetermined time, the discharge amount becomes constant.
The three-dimensional modeling apparatus according to claim 4, wherein the three-dimensional modeling apparatus is characterized in that. The modeling liquid to be discharged to the powder layer on the outermost surface is discharged in a plurality of times.
The three-dimensional modeling apparatus according to any one of claims 1 to 5, wherein the three-dimensional modeling apparatus is characterized in that. A maintenance unit for performing maintenance of the discharge unit is provided.
The operation is stopped by the maintenance.
The three-dimensional modeling apparatus according to claim 1. Equipped with a user interface section that accepts operation instructions from the user
The operation is stopped by an operation instruction by the user.
The three-dimensional modeling apparatus according to any one of claims 1 to 7, wherein the three-dimensional modeling apparatus is characterized in that. A flattening portion for flattening the powder layer is provided.
A three-dimensional model is formed by repeating a series of processes of forming the powder layer, flattening the powder layer, and discharging the modeling liquid.
The three-dimensional modeling apparatus according to any one of claims 1 to 8, wherein the three-dimensional modeling apparatus is characterized in that. The powder layer forming step of forming a powder layer,
A discharge step of discharging a modeling liquid onto the surface of the powder layer to form dots, and a discharge process.
It includes,
When the operation related to the formation of the powder layer or the discharge of the modeling liquid is stopped and restarted , at least one of the dot regions formed by the dots formed on the outermost surface of the powder layer before the operation is stopped. the shaped solution onto part said powder layer after being discharged is formed,
A three-dimensional modeling method characterized by this.

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