JP2010012736A - Three-dimensional shaping method and three-dimensional shaping apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a three-dimensional shaping method which enables the manufacture of a precise three-dimensional model in a short time by using a compact apparatus simple in composition and a three-dimensional shaping apparatus. <P>SOLUTION: In three-dimensional shaping by a sheet lamination method, a sheet material S made of water-soluble paper is used as a lamination material. During the lamination of each layer, by dropping a curable aqueous solution with the use of the nozzle of a liquid droplet discharge head 7, the sectional part of the three-dimensional model M in the sheet material S of each layer is made insoluble, and a curable coloring solution is dropped in a coloring part to color and cure the part. After the completion of a laminate S0, the laminate S0 is immersed in water to remove the sheet material S which is not insolubilized, and the three-dimensional model M is completed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a three-dimensional modeling method and a three-dimensional modeling apparatus that create a three-dimensional model by stacking sheet materials.

  Conventionally, as a three-dimensional modeling method for creating a three-dimensional model of a three-dimensional shape, an optical modeling method in which each layer of a laminated model is formed by curing a UV curable resin to a cross-sectional shape of a three-dimensional model, and a powder material is welded by a laser. Powder sintering method that solidifies to form each layer of the laminated model, melt deposition method that forms each layer of the laminated model by heating and extruding the thermoplastic material from the nozzle, and cross-section of the sheet material such as paper A sheet lamination method that forms a lamination model by cutting, laminating, and adhering to a shape has been proposed.

  Among the above methods, the stereolithography method, the powder sintering method, and the melt deposition method are each a large-scale apparatus equipped with a laser irradiation device, a resin tank, equipment for cleaning the surface of a molded product, or equipment for supplying a molten resin. And expensive equipment was required. In addition, because special materials are used, ventilation in the facility is necessary, and floor reinforcement may be necessary to cope with equipment load and vibration during operation. Therefore, it was difficult to install in a general office. In addition, the time for curing the resin material and the like is long, and it takes time for modeling. On the other hand, since the sheet laminating method can use paper or a film, which are general materials, as a material, it can be realized with a simpler and smaller apparatus than the above methods.

An example of an apparatus that performs three-dimensional modeling by a sheet lamination method is described in Patent Document 1. When the three-dimensional shape creation device (three-dimensional modeling device) of Patent Document 1 is formed by sequentially laminating resin films in a state of being wound around a roller or in a state of being cut into a fixed shape, and laminating each layer, The cross-sectional shape of the three-dimensional model is drawn by light such as laser or heat, and a predetermined chemical reaction is caused to occur in the resin film at the drawing portion. And after completion of a laminated body, the process of melt | dissolving and removing parts other than the reaction part by a drawing process with a solvent etc. is completed, and the three-dimensional model is completed.
Japanese Patent Laid-Open No. 10-244596

  The three-dimensional shape creation apparatus (three-dimensional modeling apparatus) described in Patent Document 1 alters a resin film so that it does not dissolve in a solvent due to the heat of a laser beam or a thermal head. A laser irradiation apparatus can perform precise drawing, but requires a large and expensive apparatus. Further, it is difficult to heat a fine pattern with a thermal head, and there is a problem that it is not possible to cope with a precise cross-sectional shape. In addition, materials that can be modified so as not to be dissolved in a solvent by laser light or heat are limited, and the material of the sheet material is limited to resin materials having such characteristics.

  Moreover, since the three-dimensional shape creation apparatus (three-dimensional modeling apparatus) of patent document 1 does not have the coloring function of a three-dimensional model part, in order to perform color three-dimensional modeling, the sheet material is colored in advance or after modeling. A coloring process must be performed. Therefore, equipment for that purpose is required separately, and it takes time to complete the color three-dimensional model. In addition, when coloring after modeling, there is a problem that it is difficult to color the interior of the three-dimensional model.

  In view of these points, the object of the present invention is to create a precise three-dimensional model in a short time with a small and simple device using a sheet material that reacts and insolubilizes with a sheet material insolubilizing liquid. Is to propose a three-dimensional modeling method and a three-dimensional modeling apparatus.

  Another object of the present invention is to simultaneously complete the modeling and coloring of the three-dimensional model by the sheet lamination method in the same apparatus, so that the color three-dimensional model can be completed in a short time. The object is to propose a three-dimensional modeling method and a three-dimensional modeling apparatus capable of coloring inside and precise coloring.

In order to solve the above problems, the three-dimensional modeling method of the present invention is:
A three-dimensional modeling method for forming a three-dimensional model by laminating sheet materials,
When laminating the sheet material of each layer,
While dropping the sheet material insolubilizing liquid using a droplet discharge head to the cross-sectional part of the three-dimensional model in the sheet material of each layer, insolubilizing the cross-sectional part,
Adhering at least a part of the cross section to the sheet material of the upper and lower layers,
After the layers of the sheet materials of all layers are laminated and bonded, the non-insolubilized portion of the sheet material of each layer is dissolved and removed by a sheet material solution.

  In the present invention, the cross-sectional portion of the three-dimensional model in the sheet material of each layer is insolubilized by dropping the sheet material insolubilizing liquid from the droplet discharge head as described above. And after a laminated body completion, the unnecessary part of the sheet | seat material which is not insolubilized is dissolved and removed. In such a method, since it is not necessary to cut each layer to the cross-sectional shape of the three-dimensional model, the three-dimensional model can be created in a short time. In addition, since a cutting means such as a cutter blade is not necessary, three-dimensional modeling can be performed with an apparatus having a safe and simple configuration. In addition, by using the droplet discharge head, the sheet material insolubilized liquid can be dropped in a precise pattern in a short time, and unnecessary parts of the sheet material are dissolved and removed, so a precise three-dimensional model can be created in a short time. Can be created. In addition, a water-resistant three-dimensional model can be created using the insolubilized sheet material.

  In this invention, it is good to color the cross-sectional part of the said solid model in the sheet | seat material of the layer of coloring object with the said sheet | seat material insolubilization liquid. By using a coloring solution having a desired color as the sheet material insolubilizing solution, the insolubilizing step and the coloring step can be performed in the same step. Therefore, a color solid model can be created in a short time. In addition, by using a droplet discharge head, a fine pattern can be colored, and full-color coloring is also possible. In addition, since coloring is performed when each layer is laminated, it is possible to color the portion of the inner layer that is difficult to color after completion of the laminated body.

  Here, a water-soluble paper containing a water-soluble binder and a papermaking fiber material is used as the sheet material in the present invention, and water is preferably used as the sheet material solution. Moreover, it is good to use the curable solution by a heat | fever, an ultraviolet-ray, etc. as said sheet material insolubilization liquid. In this way, if water-soluble paper is used, the process of dissolving the unnecessary part of the sheet material can be performed by washing with water or immersing in water without using chemicals, etc., so that the unnecessary part can be easily removed. And can be done safely.

  In addition, the three-dimensional model created by the present invention has a shape having a hollow portion communicating with the outside, and the hollow portion has a shape in which the filling material filled inside cannot be pulled out as it is. In the present invention, the unnecessary portion of the sheet material is dissolved and removed, so even if it is a three-dimensional model having such a hollow portion, the unnecessary portion of the sheet material can be finally removed. Therefore, a complicated shape solid model can be easily created in a short time.

  In the present invention, when the sheet material of each layer is bonded to the sheet material of the upper and lower layers, the sheet material solution or adhesive is dropped on the lower layer side sheet material to be welded or bonded, or the upper layer It is good to heat-press and heat-press from the side sheet material. According to such a bonding method, only necessary portions can be easily bonded. Further, in the method of dropping the sheet material solution or the adhesive without using a thermocompression bonding means such as a thermal head, it is not necessary to apply an adhesive or the like to the sheet material in advance. Moreover, the equipment used for the three-dimensional modeling can be reduced, and the three-dimensional modeling can be performed with an apparatus having a simple configuration.

In order to solve the above problems, the three-dimensional modeling apparatus of the present invention is
A droplet discharge head for dropping a sheet material insolubilizing liquid;
A sheet material transport mechanism for transporting and stacking the sheet material to a dropping position facing the liquid droplet ejection head;
Sheet material dissolving means for supplying or storing the sheet material solution;
A control unit to which shape data of the three-dimensional model is input,
The control unit is characterized in that the three-dimensional model is formed by each of the three-dimensional modeling methods described above by controlling the droplet discharge head and the sheet material transport mechanism based on the shape data.

  According to the present invention, since it is not necessary to cut the sheet material of each layer forming the laminated body into the cross-sectional shape of the three-dimensional model, the three-dimensional model can be created in a short time. In addition, since a cutting means such as a cutter blade is not necessary, three-dimensional modeling can be performed with an apparatus having a safe and simple configuration. In addition, by using the droplet discharge head, the sheet material insolubilized liquid can be dropped in a precise pattern in a short time, and unnecessary parts of the sheet material are dissolved and removed, so a precise three-dimensional model can be created in a short time. Can be created. In addition, a water-resistant three-dimensional model can be created using the insolubilized sheet material.

  Below, with reference to drawings, the three-dimensional model | molding apparatus and three-dimensional model | molding method which concern on embodiment of this invention are demonstrated.

(Sheet material)
The three-dimensional modeling apparatus of this embodiment is an apparatus for forming a three-dimensional model by a sheet lamination method. First, the sheet material S that is a laminated material will be described. The sheet material S is a special paper that is formed into a sheet shape by a papermaking method such as paper making by adding a water-soluble binder to a papermaking fiber material such as wood pulp fiber, and has a thickness and strength suitable for three-dimensional formation by a sheet lamination method. It is molded into.

  More specifically, the sheet material S is a water-soluble paper imparted with a property of being easily dissolved by water (sheet material solution) by being treated with alkali after molding. When the sheet material S is infiltrated by dropping water or the like, the water-soluble binder in the portion in which the water has infiltrated dissolves and the hydrogen bond between the pulp fibers is eliminated. Only the fibers remain. Therefore, it is possible to cut the sheet material S by dripping water, or to dissolve and remove unnecessary portions of the sheet material S by dripping water.

  The sheet material S is a material that can be impregnated with a curable solution such as a resin solution. By applying a predetermined curing treatment to the impregnated portion, the curable solution is fixed to the impregnated portion and insolubilized. Can do. As the curable solution, for example, a room temperature curable (rapid drying) solution, a thermosetting solution, an ultraviolet (UV) curable solution, or an electron beam (EB) curable solution can be used. When each of these solutions is used, it is preferable to perform a curing process suitable for the characteristics of each solution. The sheet material S has the property that when impregnated with an acidic aqueous solution (sheet material insolubilized solution) having a pH of about 2 to 3, the impregnated portion loses water solubility and is hardly dissolved in water. Therefore, it is also possible to insolubilize using an acidic aqueous solution instead of the curable solution.

  Therefore, the sheet material S is laminated while being impregnated with such a curable solution or an acidic aqueous solution to form a laminate of the sheet material S in which only the three-dimensional model portion is insolubilized, and then the laminate is immersed in water or the laminate. It is possible to dissolve and remove the portion of the sheet material S that has not been insolubilized, and leave only the three-dimensional model portion by performing a process such as pouring water into the substrate and washing it.

(3D modeling equipment)
Next, the three-dimensional modeling apparatus will be described. FIG. 1 is a schematic configuration diagram of a three-dimensional modeling apparatus. The three-dimensional modeling apparatus 1 includes a stackable table 2 provided in an apparatus frame, a sheet feeding unit 3 that holds a sheet material S wound in a roll paper shape in a rollable manner, and a sheet feeding unit 3. A continuous paper-like sheet material S having a constant width fed from the sheet material is fed along the sheet material conveyance path 4 and conveyed to the stacking position on the stacking table 2. A cutting mechanism 6 that cuts the aligned sheet material S to a predetermined length, a droplet discharge head 7 that is disposed on the stacking table 2 with the nozzle surface facing, and a head carriage on which the droplet discharge head 7 is mounted. 8 and its driving mechanism 9, a thermal head 10 for heating and thermocompression bonding a predetermined portion of the sheet material S laminated on the laminating table 2, and a controller 11 for controlling these mechanisms. ing.

  In addition, the three-dimensional modeling apparatus 1 includes a cartridge mounting portion 13 that can mount a cartridge 12 containing a plurality of liquid packs in which liquids such as various aqueous solutions, inks, water, and adhesives are sealed. When the cartridge 12 is mounted on the cartridge mounting portion 13, a supply needle provided on the cartridge mounting portion 13 side is inserted and connected to a supply port such as a liquid pack in the cartridge 12. Since the supply needle is connected to a flexible supply channel extending from the droplet discharge head 7, each liquid in the liquid pack is supplied to the nozzle of the droplet discharge head 7.

  The stacking table 2 includes a horizontal stacking surface 2a, and is configured to be able to adjust the height of the stacking surface 2a by moving the stacking surface 2a up and down by a lifting mechanism (not shown). The laminated surface 2a is formed in such a size that a sheet material S such as a rectangle cut in accordance with the planar shape of the three-dimensional model M to be created can be laminated, and the sheet material S is formed on the laminated surface 2a. The stacking position is set.

  The three-dimensional modeling apparatus 1 is provided with a discharge mechanism (not shown) for discharging the stacked body S0 of the sheet material S formed on the stacking table 2 to the outside of the apparatus. The laminated body S0 discharged to the outside of the apparatus by the discharge mechanism is transferred into a water tank 14 (sheet material dissolving means) for performing a removing step for removing an unnecessary portion of the sheet material S, which will be described later, and immersed in water. The In addition, you may provide the conveyance mechanism for conveying laminated body S0 on the lamination stand 2 to the water tank 14. FIG. Moreover, you may comprise so that a shower nozzle may be provided in the water tank 14, and an unnecessary part of the sheet | seat material S may be melt | dissolved rapidly by showering water on the laminated body S0 from a shower nozzle.

  The transport mechanism 5 includes a pair of paper feed rollers for gripping the sheet material S fed from the paper feed unit 3 at a predetermined position on the sheet material transport path 4, and the paper feed roller pair is synchronized by a paper feed motor. The sheet material S is conveyed in the forward or backward direction along the sheet material conveyance path 4 by being rotationally driven in the forward and reverse directions.

  The cutting mechanism 6 is a scissors type having a movable blade and a fixed blade. The cutting mechanism 6 moves the movable blade toward the sheet material S aligned with the stacking position on the stacking surface 2a by the transport mechanism 5, and moves the sheet material S in the width direction at a position of a predetermined length from the tip. Disconnect.

  The drive mechanism 9 includes an XY plotter mechanism that can freely move the head carriage 8 on which the droplet discharge head 7 is mounted within a horizontal plane. Thereby, the droplet discharge head 7 is moved along an arbitrary path on the stacking table 2, and various kinds of coloring solution, aqueous solution, water, and the like are moved from the nozzle of the droplet discharging head 7 to an arbitrary position on the stacking table 2. Liquid can be dropped.

  The control unit 11 of the three-dimensional modeling apparatus 1 receives shape data of the three-dimensional model M to be created and coloring data indicating the coloring portion and the coloring pattern from an external device 15 such as a host computer. Further, data such as the thickness, dimensions, and material of the sheet material S is input. In addition, you may acquire by detecting the thickness and dimension of the sheet | seat material S with the sensor in the three-dimensional modeling apparatus 1. FIG. The control unit 11 drives and controls the droplet discharge head 7 via a head driver based on these shape data, coloring data, and the like, so that the type of liquid indicated in the shape data and coloring data is supplied to the droplet discharge head. It can be dripped from 7 nozzles.

  The controller 11 drives and controls the X-axis motor and Y-axis motor of the drive mechanism 9, the paper feed motor of the transport mechanism 5, the cut motor of the cutting mechanism 6, and the like via a motor driver. Further, the control unit 11 is configured to be able to grasp the leading end position of the sheet material S being conveyed by the output of a detection sensor or the like provided along the sheet material conveyance path 4 or on the stacking table 2. Thereby, the sheet material S can be accurately aligned and stacked at the stacking position on the stacking surface 2a. In addition, the sheet material S can be cut by the cutting mechanism 6 to the dimensions indicated by the shape data. In addition, the nozzles of the droplet discharge head 7 can be aligned with specified positions on the sheet material S of each layer.

  Further, the control unit 11 controls driving of a motor that is a driving source of the lifting mechanism of the stacking table 2 via a motor driver, so that the stacked sheet material S is stacked each time the sheet material S is stacked on the stacking table 2. The laminated surface 2a is lowered according to the thickness of S. Alternatively, the position of the uppermost surface of the laminated body S0 of the sheet material S may be detected by a sensor or the like, and the laminated surface 2a may be lowered so as to align the position of the uppermost surface with a predetermined height. Thereby, the distance between the uppermost sheet material S and the nozzles of the droplet discharge head 7 can be kept constant, and the droplet discharge head 7 can drop a solution or the like onto the sheet material S stacked on the uppermost layer. Can be done accurately. That is, when performing the processing step on the stacking table 2, the control unit 11 of the three-dimensional modeling apparatus 1 stacks the stack 2 of the sheet material S so that each layer of the stack of sheet materials S is positioned at a height corresponding to the processing content. Can be moved up and down.

(Three-dimensional modeling method)
Next, the three-dimensional modeling method by the three-dimensional modeling apparatus 1 having the above configuration will be described. 2A is a plan view of each layer in the laminate of sheet materials, and FIG. 2B is a cross-sectional view of the laminate of sheet materials. A region L shown in FIGS. 2A and 2B is a portion of the cross-sectional shape of the three-dimensional model M at the height of the sheet material S of each layer of the laminate S0, and is a portion that is insolubilized and becomes a part of the three-dimensional model M. is there. Moreover, the part outside the area | region L in each layer is an unnecessary part removed after completion of laminated body S0. FIG. 3 is an explanatory diagram of the three-dimensional modeling method.

  First, in the external device 15, three-dimensional shape data of the three-dimensional model M is created using a CAD program or the like, and is output to the three-dimensional modeling device 1. Further, the external device 15 outputs various information such as the thickness t and the paper width of the sheet material S that is a modeling material to the three-dimensional modeling device 1. The control unit 11 of the three-dimensional modeling apparatus 1 analyzes the three-dimensional shape of the three-dimensional model M from the three-dimensional shape data input from the external device 15, and then uses this three-dimensional shape for the thickness t of the sheet material S as one layer. Is divided into slices in the height direction. Then, for each sliced layer, this three-dimensional cross-sectional shape, that is, the cross-sectional shape of the three-dimensional model M, is developed into image data and stored in a buffer. Note that cross-sectional shape data in each layer obtained by slicing the three-dimensional model M with a thickness t on the external device 15 side may be created and output to the three-dimensional modeling apparatus 1.

  Next, the control part 11 laminates | stacks the sheet material S of each layer, and insolubilizes the cross-section part of the three-dimensional model M in the sheet material S of each layer, and forms the laminated body S0. Hereinafter, the process of forming each layer of the stacked body S0 will be described with reference to FIGS.

  First, as shown in FIG. 3A, the control unit 11 controls the conveyance mechanism 5 to convey the sheet material S fed from the paper feeding unit 3 to the lamination surface 2a and align it with the lamination position. Then, the sheet is cut into a predetermined size by the cutting mechanism 6, and a rectangular cut sheet is placed on the laminated surface 2a in the case of the lowermost layer and on the sheet material S already laminated in the case of the upper layer. To do. Note that when the cut sheet-like sheet material S that has been cut into a fixed shape in advance is set in the paper feeding unit 3, the cutting step and the cutting mechanism 6 can be omitted.

  Next, as shown in FIG. 3B, a predetermined portion in the region L (for example, a portion along the outer periphery of the region L) is heated by the thermal head 10 so that the sheet material S is partially separated from the lower layer. Adhere to. The entire region L may be bonded to the lower layer, or the entire sheet material S of this layer may be bonded to the lower layer. The sheet material S is previously coated with an adhesive that melts with heat.

  Subsequently, as shown in FIG. 3C, the control unit 11 moves the droplet discharge head 7 in the horizontal direction on the sheet material S along the outside of the contour line of the region L, and the droplet discharge head 7. Water is dropped from the nozzle for dropping water along the shape of the contour line of the region L. Thereby, the thin water permeation portion B is formed along the outer periphery of the region L. At this time, the control part 11 controls the dripping amount and dripping timing of water in each position so that the permeation part B of water does not spread inside the region L. By forming such a water permeation portion B, unnecessary portions can be removed. In addition, the process of forming the water permeation portion B can be omitted.

  After the water is dropped, the control unit 11 moves the droplet discharge head 7 over the region L as shown in FIG. 3D, and the region from the curable solution dropping nozzle of the droplet discharge head 7 A curable solution is dropped into the portion L. Thereby, the permeation | transmission part of a curable solution is formed so that it may become the same shape as the area | region L. FIG. At this time, the dripping amount of the curable solution at each position is controlled so that the curable solution penetrates to the back side of the sheet material S. Then, a predetermined curing process is performed to cure the permeation portion.

  The control unit 11 repeats the four steps of FIGS. 3A to 3D as many times as the number of the sheets S stacked, thereby forming a stack S0 that is slightly larger than the shape of the three-dimensional model M. Thereafter, as shown in FIG. 3 (e), the stacked body S0 is discharged from the top of the stacking table 2 to the outside of the apparatus, immersed in water in the water tank 14, and the sheet material S on the outer peripheral side not insolubilized. Dissolve and remove the portion of the unnecessary sheet material S leaving only the portion of the three-dimensional model M.

  After the removal, the remaining portion is dried to complete the modeling of the three-dimensional model M. In addition, the edge part of the sheet | seat material S which remained insolubilized is not a sharp end surface, but the part from which the pulp fiber etc. which are not melt | dissolved with water protrude | jumped out long may have become fluffy. Therefore, the surface of the dried three-dimensional model M may be smoothed by polishing with sandpaper or the like, and surface coating may be performed by applying a coating agent thereon. In this way, it is possible to suppress the deterioration of the three-dimensional model M and to create the three-dimensional model M having a smooth surface.

  As described above, in the present embodiment, the portion of the region L that is a portion of the cross-sectional shape of the three-dimensional model M in the sheet material S of each layer is insolubilized by dropping the curable solution from the droplet discharge head. And the completed laminated body S0 is immersed in water, and the part of the sheet material S which is not insolubilized is dissolved and removed. According to such a method, since it is not necessary to cut each layer into the cross-sectional shape of the three-dimensional model M, the three-dimensional model M can be created in a short time. In addition, since a cutting means such as a cutter blade is not necessary, three-dimensional modeling can be performed with an apparatus having a safe and simple configuration. Further, since the curable solution can be dropped in a precise pattern in a short time by using the droplet discharge head 7, a precise three-dimensional model M can be created in a short time. Further, a three-dimensional model M having water resistance formed by the insolubilized sheet material S is obtained.

  Here, in order to accurately form the water permeation portion, for example, when dripping water at each position, the amount of dripping at a time is set to a very small amount, and a minute amount of dripping is performed at a time interval of a predetermined time or more. It is good to do it several times. If it does in this way, the water dripped initially will not spread so much in the surface direction of the sheet material S. Then, the next minute amount of water dropped after a predetermined time has elapsed (after the first curable solution has permeated) does not spread in the surface direction of the sheet material S but permeates in the thickness direction. Therefore, a sharply shaped water permeation portion can be formed along the contour line of the region L. As described above, the shape of the permeation portion can be appropriately controlled by appropriately setting the amount of droplets to be dropped at one time, the number of times of dropping, and the time interval according to the material, thickness, and the like of the sheet material S. . In addition, when forming the penetration area | region of a curable solution into the shape of the area | region L by dripping control as mentioned above, you may abbreviate | omit the dripping process of water.

  Further, instead of the bonding method of bonding the sheet material S to the upper and lower layers by the thermal head 10, an adhesive is dropped from the droplet discharge head 7 onto the bonding portion of the sheet material S, and the sheet material S of the layer above it is dropped. And may be adhered. Alternatively, a small amount of water may be dropped on the adhesion portion of the sheet material S to slightly dissolve the dripping portion, and the sheet materials S may be welded together. In this way, since the thermal head 10 is not necessary, the three-dimensional modeling apparatus 1 can be further downsized and simplified. Further, it is not necessary to apply an adhesive that melts by heat to the sheet material S in advance.

  According to the above three-dimensional modeling method, even a three-dimensional model M having a shape in which it is difficult to remove an unnecessary portion from the laminated body later can be easily created. FIG. 4 is a cross-sectional view of a laminate for creating a three-dimensional model having a hollow portion. The hollow portion M1 of the three-dimensional model communicates with the outside of the three-dimensional model M through an opening M2 (communication portion), and the internal space of the hollow portion M1 is wider than the opening M2. In such a shape, it was difficult to take out the lump of the sheet material S inside the hollow portion M1 as it is after the completion of the laminated body S0, but the sheet material S in the hollow portion M1 can be dissolved. In this case, it is possible to remove the clumps of the sheet material S. Further, according to this method, the bulk of the sheet material S filled in the hollow portion is left as it is, such as a hollow portion that is bent or curved, or an inner surface of the hollow portion is uneven. Even in a shape that cannot be drawn out in shape, the sheet material S can be removed without dividing the three-dimensional model. Further, even a three-dimensional model having a shape in which it is difficult to peel off unnecessary portions from the laminate due to complex irregularities can be easily created.

(3D modeling method including coloring process)
Here, a method of performing the modeling process of the above-described three-dimensional modeling method in the same apparatus at the same time as the coloring process of each part of the three-dimensional model M will be described. In this method, a solution containing a coloring solution is used as the curable solution sealed in the liquid pack in the cartridge 12 of the three-dimensional modeling apparatus 1. The color of the coloring solution is appropriately prepared according to the coloring pattern of the three-dimensional model M.

  In this case, the external device 15 creates color three-dimensional shape data including the three-dimensional shape information (shape data) of the three-dimensional model M and coloring information (coloring data) at each position of the three-dimensional shape. Output to 1. The control unit 11 slices the color three-dimensional shape data input from the external device 15 in the height direction with the thickness t of the sheet material S as the height of one layer, and for each layer, the region L of the three-dimensional model M. The shape and the coloring pattern on the region L are developed into image data and stored in a buffer.

  When the sheet material S of the layer to be colored is laminated, in the step of FIG. 3D, the droplet discharge head 7 is controlled based on the colored pattern on the region L, and the coloring solution is applied to the colored portion. Dripping. In this way, it is possible to color a desired portion of the sheet material S of a desired layer by the droplet discharge head 7. It should be noted that a portion of the inner layer that does not appear on the surface of the three-dimensional model M can be prevented from being colored by dropping a colorless curable solution, or can be colored to the inside.

  Thus, the insolubilization process and the coloring process can be performed in the same process by using a solution containing a coloring solution of a desired color as the curable solution for insolubilizing the sheet material. Therefore, a color solid model can be created in a short time. Further, by using the droplet discharge head 7, a fine pattern can be colored, and full-color coloring is also possible. In addition, since coloring is performed when each layer is laminated, it is possible to color hollow portions and internal layer portions that are difficult to color after lamination.

(Application of this embodiment)
As described above, the three-dimensional modeling apparatus and the three-dimensional modeling method of the present embodiment are convenient for manufacturing a color three-dimensional product because the layered modeling process and the coloring thereof can be performed at once by one apparatus. Moreover, since a desired site | part can be colored, the paper tableware etc. which provided water resistance can be manufactured. Moreover, what laminated | stacked and adhere | attached the water-soluble paper containing a pulp fiber is a raw material which is stronger than natural wood, and was equipped with water resistance. Accordingly, it is possible to manufacture a substitute part for a wood part such as a wooden exterior material. In this case, by using the droplet discharge head 7 for coloring, it is possible to color a wood pattern very similar to any wood.

1 is a schematic configuration diagram of a three-dimensional modeling apparatus according to an embodiment of the present invention. It is sectional drawing of the laminated body of a sheet material, and a top view of each layer. It is explanatory drawing of a three-dimensional modeling method. It is sectional drawing of the laminated body for creating the three-dimensional model which has a hollow part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stereolithography apparatus, 2 ... Laminate stand, 2a ... Laminate surface, 3 ... Paper feed part, 4 ... Sheet material conveyance path, 5 ... Conveyance mechanism, 6 ... Cutting mechanism, 7 ... Droplet discharge head, 8 ... Head carriage , 9 ... Drive mechanism, 10 ... Thermal head, 11 ... Control part, 12 ... Cartridge, 13 ... Cartridge mounting part, 14 ... Water tank (sheet material dissolving means), 15 ... External device, B ... Permeation part, L ... Region ( Section of the three-dimensional model), M ... three-dimensional model, M1 ... hollow part, M2 ... opening (communication part), S ... sheet material, S0 ... laminate, t ... thickness

Claims (7)

A three-dimensional modeling method for forming a three-dimensional model by laminating sheet materials,
When laminating the sheet material of each layer,
While dropping the sheet material insolubilizing liquid using a droplet discharge head to the cross-sectional part of the three-dimensional model in the sheet material of each layer, insolubilizing the cross-sectional part,
Adhering at least a part of the cross section to the sheet material of the upper and lower layers,
A method for three-dimensional modeling, comprising: laminating and adhering all layers of sheet materials, and then dissolving and removing the non-insolubilized portion of each layer of sheet materials with a sheet material solution. The three-dimensional modeling method according to claim 1,
A three-dimensional modeling method characterized by coloring a cross-sectional portion of the three-dimensional model in a sheet material of a layer to be colored with the sheet material insolubilizing liquid. In the three-dimensional modeling method according to claim 1 or 2,
The sheet material is a water-soluble paper containing a water-soluble binder and a fiber material for papermaking,
The three-dimensional modeling method, wherein the sheet material solution is water. In the three-dimensional modeling method according to claim 3,
The three-dimensional modeling method, wherein the sheet material insolubilizing liquid is a curable solution. In the three-dimensional modeling method according to any one of claims 1 to 4,
The three-dimensional model is a shape having a hollow portion communicating with the outside,
The three-dimensional modeling method characterized in that the hollow portion has a shape in which the filling material filled therein cannot be pulled out as it is. In the three-dimensional modeling method according to any one of claims 1 to 5,
When bonding the sheet material of each layer to the sheet material of the upper and lower layers, the sheet material solution or adhesive is dropped on the lower sheet material to be welded or bonded, or the upper sheet material A three-dimensional modeling method characterized by heat-pressing at least a part of the material from above by thermocompression bonding. A droplet discharge head for dropping a sheet material insolubilizing liquid;
A sheet material transport mechanism for transporting and stacking the sheet material to a dropping position facing the liquid droplet ejection head;
Sheet material dissolving means for supplying or storing the sheet material solution;
A control unit to which shape data of the three-dimensional model is input,
The said control part controls the said droplet discharge head and the said sheet | seat material conveyance mechanism based on the said shape data, and forms the said solid model by the solid modeling method in any one of Claim 1 thru | or 6 The three-dimensional modeling apparatus characterized by doing.

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