Stereolithography apparatus and method for manufacturing molded objects

Abstract

The present invention provides a stereolithography apparatus and a method for manufacturing stereolithography objects that can accurately form objects. [Solution] The photopolymerization apparatus 10 comprises a molding tank 11 for storing photocurable resin 1 and having a light-transmitting plate 14 on its bottom surface; a light irradiation unit 20 for irradiating light L to cure the photocurable resin 1; a platform 12 that can be raised and lowered relative to the molding tank 11; a partition wall 13 that can be raised and lowered relative to the platform 12, is formed in a cylindrical shape and is positioned on the outside of the platform 12 via an airtight member 17, and cooperates with the platform 12 to form an airtight space 3; a lifting and lowering control unit 31 that forms a photocurable resin layer of a predetermined thickness between the lower surface of the partition wall 13 and the lower surface of the space 3 and the light-transmitting plate 14; a chamber 40 that houses the molding layer, the light irradiation unit, the platform and the partition wall; and an internal pressure adjustment control unit 33 that adjusts the internal pressure in the chamber.

Description

Technical Field

[0001] The present invention relates to a stereolithography apparatus and a method for manufacturing a molded object.

Background Art

[0002] Generally, a stereolithography technique is known in which a liquid photocurable resin is irradiated with light such as ultraviolet light to form a three-dimensional molded object from the cured resin. In Patent Document 1, as a so-called regulated liquid surface method, through a light transmission window provided on the bottom surface of a liquid tank storing a photocurable resin, light corresponding to a cross section (predetermined cross section ) at a predetermined height position of the molded object is irradiated toward a base disposed opposite to the light transmission window, and a layer of resin (cured layer) cured in the same shape as the predetermined cross section is formed on the lower surface of this base. And a step of pulling up the base upward by a predetermined height with respect to the liquid tank is repeated to laminate the cured layers to form the target molded object. A stereolithography technique is disclosed. [[ID=2O]]

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the conventional regulated liquid surface method, the molded object formed by laminating the cured layers is immersed in the photocurable resin in the liquid tank. Therefore, the irradiated light may cure the excess photocurable resin, and there is room for improvement in accurately molding the molded object.

[0005] ​​​​​​​The present invention has been made in view of the above, and is capable of forming molded objects with high precision. The objective is to provide a stereolithography apparatus and a method for manufacturing the manufactured object. [Means for solving the problem]

[0006] To solve the above-mentioned problems and achieve the objective, the photopolymerization apparatus according to the present invention is photocuring A molding tank for storing photocurable resin, with a light-transmitting section at the bottom, and a light-transmitting section for transferring photocurable resin A light irradiation section that emits light to cure the material, and a section opposite the light transmission section that is movable up and down relative to the molding tank. The rat platform and the platform are movable up and down, and are formed in a cylindrical shape. It is positioned on the outside of the platform via an airtight member and works in cooperation with the platform to create an airtight space. The bulkheads to be formed, the platform and the bulkheads are raised and lowered respectively, and the bottom surface of the bulkheads and airtightness The apparatus comprises a lifting control unit that forms a photocurable resin layer of a predetermined thickness between the lower surface of the space and the light-transmitting part, a chamber that houses the molding layer, the light irradiation part, the platform, and the partition wall, and an internal pressure adjustment control unit that adjusts the internal pressure within the chamber.

[0007] Furthermore, the present invention relates to a molding tank for storing a photocurable resin, and a light-transmitting section provided on the bottom surface, and a light-transmitting section A light irradiation section that irradiates light to cure the photocurable resin through the light transmission section, and a section opposite the light transmission section, A platform that can be raised and lowered relative to the tank, and a platform that can be raised and lowered relative to the platform Also, it is formed in a cylindrical shape and placed on the outside of the platform via an airtight member, and the platform A method for manufacturing a molded object using a stereolithography apparatus equipped with a partition wall that works in cooperation with a frame to form an airtight space. The law involves raising and lowering the platform and bulkhead, respectively, and the bottom surface of the bulkhead and the airtight space The steps include forming a photocurable resin layer of a predetermined thickness between the lower surface and the light-transmitting portion, and the objective Light corresponding to the cross-sectional shape at a predetermined height position of the shaped object is irradiated from the light irradiation unit onto the photocurable resin layer to form a cured layer, and a step of relatively lowering the partition wall with respect to the platform by a predetermined thickness are repeatedly executed.

Advantages of the Invention

[0008] According to the present invention, there is an effect that the shaped object can be accurately molded.

Brief Description of the Drawings

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the basic configuration of the optical shaping apparatus according to the first embodiment. [Figure 2] FIG. 2 is a diagram for explaining the procedure of the manufacturing method of the shaped object according to the first embodiment. [Figure 3] FIG. 3 is a diagram for explaining the procedure of the manufacturing method of the shaped object according to the first embodiment. [[ID=2​​​​​​​​​​​​​​​​​​​​​​ [Figure 12] FIG. 12 is a diagram for explaining the procedure of a method of manufacturing a shaped object according to the third embodiment. [Figure 13] FIG. 13 is a diagram for explaining the procedure of a method of manufacturing a shaped object according to the third embodiment. [Figure 14] FIG. 14 is a diagram for explaining the procedure of a method of manufacturing a shaped object according to the third embodiment. [Figure 15] FIG. 15 is a schematic diagram showing the basic configuration of a stereolithography apparatus according to the fourth embodiment. [Figure 16] FIG. 16 is a diagram for explaining the operation of the suction mechanism of the stereolithography apparatus according to the fourth embodiment.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited by this embodiment, and when there are a plurality of embodiments, those configured by combining each embodiment are also included. Further, in the following embodiments, the same parts are denoted by the same reference numerals to omit redundant explanations.

[0011] Also, in the following description of the embodiments, unless otherwise specified, the uncured liquid photocurable resin is simply referred to as a photocurable resin. Further, the liquid photocurable resin is cured to form a stereolithographic object, which is referred to as a three-dimensional shaped object or simply a shaped object. This three-dimensional shaped object is not limited to the finished product in which all the plurality of cured layers to be formed are laminated, and also includes an unfinished product at the stage where intermediate cured layers are laminated . [First Embodiment] FIG. 1 is a schematic diagram showing the basic configuration of a stereolithography apparatus according to the first embodiment. The stereolithography apparatus 10, as shown in FIG. 1, includes a shaping tank 11, a platform 12, a partition wall 13, and a light irradiation It comprises a section 20 and a control unit 30. In this embodiment, the stereolithography apparatus 10 has a chamber It includes a 40 and a chamber internal pressure adjustment unit 41.

[0012] The molding tank 11 has a dish shape with an open top, and is capable of storing liquid photocurable resin 1. The molding tank 11 has a light-transmitting plate (light-transmitting part) 14 on its bottom surface. Part 14 transmits light that cures the photocurable resin 1.

[0013] Photocurable resin 1 is a raw material for three-dimensional molded object 2, and is, for example, an acrylic compound or vinyl It contains polymerizable compounds such as compounds. Furthermore, photocurable resin 1 is converted into radical species, etc. by light irradiation. It is preferable to include the polymerization initiator that is generated.

[0014] The platform 12 holds the molded object 2 made of the hardened photocurable resin 1. The platform 12 is positioned above the build tank 11, opposite the light-transmitting plate 14. For example, it is formed in the shape of a polygonal plate, such as a disc or a square plate, and its lower surface 12A is light-transmitting. It is positioned so as to be almost parallel to plate 14. Also, platform 12 is a platform It is connected to the platform lifting mechanism 15, and the operation of this platform lifting mechanism 15 controls the molding process. It is provided to be able to move up and down relative to the tank 11. Specifically, the platform 12 is light-transmitting It is possible to approach or retreat from plate 14, and light-transmitting plate 14 The molded object 2 is held on the lower surface 12A facing the opposite side.

[0015] The bulkhead 13 is located on the outside of the platform 12 and the platform 12 and the structure 2 is housed inside. The bulkhead 13 is cylindrical in shape to correspond to the shape of the platform 12. It is formed in a polygonal cylindrical shape (such as a rectangular or square cylindrical shape). Also, the partition wall 13 is a partition wall It is connected to the lifting mechanism 16, and the operation of this bulkhead lifting mechanism 16 allows it to move relative to the platform 12. It is provided so that it can be raised and lowered. That is, the partition wall 13 is relative to the platform 12. It is possible for it to rise or fall in proportion to its relative position.

[0016] Furthermore, the outer edge of platform 12 has a barrier between platform 12 and bulkhead 13. A sealing airtight member 17 is positioned. This airtight member 17 is made of an elastic material such as rubber. It is an O-ring formed by a material. The airtight member 17 is formed by the restoring force when it undergoes elastic deformation. The inner surface of the bulkhead 13 is biased, sealing the space between the platform 12 and the bulkhead 13. The sealing member 17 ensures airtightness between the platform 12 and the bulkhead 13. Therefore, When the platform 12 and the partition wall 13 are lowered into the photocurable resin 1, these platforms A space 3 (airtight space) is formed, partitioned by the hob 12, the partition wall 13, and the photocurable resin 1. It will be done.

[0017] The light irradiation unit 20 is located below the molding tank 11, that is, on the platform with the light transmission plate 14 in between. It is positioned on the opposite side of the frame 12. The light irradiation unit 20 is photocured through the light transmission plate 14. Light L that cures the resin 1 is directed towards the photocurable resin 1. Any material capable of curing resin 1 is acceptable; for example, ultraviolet light or short-wavelength visible light can be used. The light irradiation unit 20 includes a light source 21 such as an ultraviolet lamp, an image forming element 22, and a reflective mirror 23. It also includes a projection lens 24, etc.

[0018] The light source 21 emits light that is irradiated onto the image forming element 22, and is, for example, an ultraviolet lamp. The image forming element 22 processes the shape data of each layer of the object 2 to be formed according to the shape data of each layer. It modulates, for example, Elcos (LCOS: Liquid Crystal On Silicon) devices Digital mirror devices (DMDs) or liquid crystal devices A mirror can be used. The reflective mirror 23 projects light modulated by the image forming element 22. The light is reflected towards lens 24. The projection lens 24 forms an image of the light reflected by the reflective mirror 23. The light irradiation unit 20 is not limited to this, but for example, a laser light source and a mirror Using laser scanning devices that utilize motion, and optical devices that utilize reflective or refractive optical systems That's good too.

[0019] Chamber 40 includes at least a molding tank 11, a platform 12, a partition wall 13, and a light irradiation section 2. It is a container that houses the 0 and each lifting mechanism 15, 16, etc., and seals the internal environment from the outside. The chamber pressure adjustment unit 41 controls the internal pressure of the chamber 40 through the piping 42 to introduce gas (e.g., air). By introducing gas (such as air or nitrogen) or discharging gas to the outside of the chamber 40, the chamber Adjust the internal pressure of chamber 40. By fine-tuning the internal pressure of this chamber 40, the air pressure described above can be adjusted. This allows for flexible adjustment of the position of the lower surface of section 3.

[0020] The control unit 30 is composed of, for example, a CPU (Central Processing Unit) and other calculation components. This is a processing unit that is connected to each part of the stereolithography apparatus 10 and controls their operation. Control Unit 3 0 stores the program related to the manufacturing method for producing the molded object 2, and this program The RAM is loaded into memory, and the instructions included in the program are executed. The control unit 30 is shown in the figure. It includes internal memory, and the internal memory is one of the data such as programs in the control unit 30. It is used for time memory, etc.

[0021] The control unit 30 comprises a lifting control unit 31, an irradiation control unit 32, and a chamber internal pressure control unit 33. The lifting control unit 31 controls the operation of the platform lifting mechanism 15 and the bulkhead lifting mechanism 16. By controlling this, the height positions of the platform 12 and the bulkhead 13 are controlled, respectively. In other words, the lifting control unit 31 controls the platform 12 and the partition wall 13 relative to the molding tank 11. They can be raised and lowered in conjunction, or the platform 12 can be raised and lowered relative to the bulkhead 13. The lifting control unit 31 can lift the platform 12 and the partition wall 13, respectively. By lowering it, a predetermined space is created between the lower surface of the partition wall 13 and the lower surface of the space 3 and the light-transmitting plate 14. A photocurable resin layer of a certain thickness is formed.

[0022] The irradiation control unit 32 cuts the fabricated object in predetermined height increments based on, for example, 3D shape data. The system calculates the light irradiation pattern that represents the surface shape and controls the light source 21, image forming element 22, etc. The curable resin is irradiated with light. For this purpose, the irradiation control unit 32 irradiates the cross section of the molded object at a predetermined height position. Light corresponding to the shape is directed to the photocurable resin layer between the lower surface of the space 3 and the light-transmitting plate 14. By irradiating, a hardened layer of a predetermined thickness can be formed. Chamber internal pressure control unit 3 3, for example, monitors the position of the lower surface (liquid level of the photocurable resin) of the space 3 inside the partition wall 13. The internal pressure of chamber 40 is adjusted according to the result. For this purpose, the position of the lower surface of space 3 is separated. It can be aligned with the lower surface of wall 13, and light curing between the lower surface of space 3 and the light-transmitting plate 14. The thickness of the resin layer can be precisely defined.

[0023] Next, the manufacturing method for the molded object according to the first embodiment will be described with reference to Figures 2 to 7. These figures schematically show a part of the stereolithography apparatus 10 shown in Figure 1. First, Figure 2 As shown, the lifting control unit 31 controls the lower surface 12A of the platform 12 and the lower surface of the partition wall 13. The height positions of the platform 12 and the bulkhead 13 are adjusted so that they are flush with the bottom surface 13A. Next, the lifting control unit 31 is positioned higher than the molding tank 11 in which the photocurable resin 1 is stored. The platform 12 and bulkhead 13 are lowered into the molding tank 11, and the lower surface 13 of the bulkhead 13 A is positioned at a predetermined distance T between it and the light-transmitting plate 14. Here, the predetermined distance T is The thickness of the hardened layer to be molded is set to one layer (for example, a few μm to about 100 μm). In this case, the distance between the platform 12 and the light-transmitting plate 14 is the same as a predetermined distance T. A photocurable resin layer 1a of a predetermined thickness T is formed.

[0024] Next, the irradiation control unit 32, based on the three-dimensional shape data of the object 2 to be molded, The irradiation pattern that shows the cross-sectional shape of the object 2 at a predetermined height is calculated and applied to the cross-sectional shape of the first layer. The corresponding light L is irradiated onto the photocurable resin layer 1a through the light-transmitting plate 14. The photocurable resin layer 1a hardens to the same cross-sectional shape as the first layer. Therefore, as shown in Figure 3... Thus, the platform 12 holds a hardened layer 2a of a predetermined thickness T, which forms the first layer.

[0025] Next, the lifting control unit 31 controls the platform 12 and the partition wall 13, as shown in Figure 4. It is raised and positioned higher than the molding tank 11. Next, the lifting control unit 31 is shown in Figure 5. To that end, the bulkhead 13 is lowered relative to the platform 12 by a predetermined thickness T. As a result, the lower surface 13A of the partition wall 13 becomes flush with the lower surface 2aA of the hardened layer 2a, The space surrounding the hardened layer 2a is partitioned by the platform 12 and the partition wall 13 (airtight space). )3 is formed.

[0026] Next, the lifting control unit 31 moves the platform 12 and the partition wall 13 into the molding tank 11, the partition wall Lower the unit vertically until the distance between the lower surface 13A of unit 13 and the light-transmitting plate 14 is a predetermined distance T. In this case, the space 3 partitioned by the platform 12 and the bulkhead 13 becomes an airtight space. Therefore, as shown in Figure 6, a uniform predetermined thickness is formed between the lower surface 3A of space 3 and the light-transmitting plate 14. A photocurable resin layer 1a of T is formed.

[0027] Here, the lower surface 3A of space 3 coincides with the liquid surface of the photocurable resin layer 1a, and this photocurable resin The height of the liquid level in layer 1a is determined by the depth of the photocurable resin 1 in the area stored around the partition wall 13. It may vary depending on the surface area. For this reason, in this embodiment, the chat shown in Figure 1 The internal pressure adjustment unit 41 is used to properly adjust the height of the liquid level of the photocurable resin layer 1a. The chamber pressure control unit 33 controls, for example, the liquid level of the photocurable resin layer 1a inside the partition wall 13. The position is monitored, and accordingly, the photocurable resin layer 1a is adjusted to a predetermined thickness T. The internal pressure of the chamber 40 is adjusted. For example, the chamber internal pressure control unit 33 adjusts the internal pressure of the chamber. By lowering it from the initial state, the lower surface 3A of the space 3 is lowered, and the photocurable resin layer 1 The thickness of a can be reduced. By adjusting the internal pressure of chamber 40 in this way, The position of the lower surface 3A of space 3 can be aligned with the lower surface 13A of partition wall 13, and the photocurable resin Layer 1a can be brought into contact only with the lower surface 2aA of the hardened layer 2a.

[0028] Next, as shown in Figure 6, the irradiation control unit 32 emits light L corresponding to the cross-sectional shape of the second layer. The photocurable resin layer 1a is irradiated through the transparent plate 14. This irradiates the photocurable resin layer As shown in Figure 7, 1a hardens to the same cross-sectional shape as the second layer, forming a second layer of predetermined thickness T. The first layer is laminated to form the hardened layer 2a. Thus, in this embodiment, the partition wall 13 A predetermined thickness of photocuring T occurs between the lower surface 13A and the lower surface 3A of the space 3 and the light-transmitting plate 14. A photocurable resin layer 1a is formed, and to cure this photocurable resin layer 1a into a predetermined shape, a cured layer 2 is formed. The thickness of a can be molded with high precision, and consequently, the molded object 2 can be molded with high precision. In addition, in this embodiment, a space 3 is provided around the previously molded hardened layer 2a. Therefore, the light L irradiated through the light-transmitting plate 14 cures the excess photocurable resin 1. This can prevent malfunctions that would otherwise occur.

[0029] Thus, the lifting control unit 31 and the irradiation control unit 32 are responsible for the formation of the photocurable resin layer 1a, The process of forming a hardened layer 2a is performed alternately, and the n+1th layer is formed on the nth (n is a natural number) hardened layer 2a. The molded object 2 can be formed by laminating the hardened layer 2a.

[0030] As described above, the stereolithography apparatus 10 according to the first embodiment stores the photocurable resin 1 and has a light-transmitting bottom surface. A molding tank 11 is provided with a light-transmitting plate 14, and a photocurable resin 1 is transmitted through the light-transmitting plate 14. A light irradiation unit 20 that irradiates light L to cure the material, and a molding tank 11 facing the light transmission plate 14. A platform 12 that can be raised and lowered relative to the platform 12, and a platform 12 that can be raised and lowered relative to the platform 12 It is formed in a cylindrical shape and is placed on the outside of the platform 12 via an airtight member 17. A partition wall 13 that works in cooperation with platform 12 to form an airtight space 3, and platform 1 2 and the bulkhead 13 are raised and lowered respectively, and the lower surface 13A of the bulkhead 13 and the lower surface 3A of the space 3 Lifting control unit 31 forms a photocurable resin layer 1a of a predetermined thickness T between itself and the light-transmitting plate 14. Then, light L corresponding to the cross-sectional shape at a predetermined height position of the target object 2 is emitted from the light irradiation unit 20. The system includes an irradiation control unit 32 that irradiates a photocurable resin layer 1a to form a cured layer 2a.

[0031] According to this configuration, the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 and the light-transmitting plate 1 A photocurable resin layer 1a of a predetermined thickness T is formed between 4 and the other, and this photocurable resin layer 1a is formed into a predetermined shape Because it hardens in a specific way, the thickness of the hardened layer 2a can be precisely molded, and consequently the fabricated object 2 can be molded with high precision. Furthermore, with this configuration, the previously molded hardened layer 2 Since a space 3 can be provided around a, light irradiated through the light-transmitting plate 14 L can prevent the problem of excess photocurable resin 1 curing, and the molded object 2 can be manufactured with high precision. It can be molded into shape.

[0032] Furthermore, each time the formation of the hardened layer 2a is completed, the lifting control unit 31 moves the platform 12. In order to lower the bulkhead 13 by a predetermined thickness T, the platform 12 and the bulkhead 13 When it is lowered into the molding tank 11, the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 are transparent to light. A photocurable resin layer 1a of a predetermined thickness T can always be formed between the overplate 14 and the other plate. Therefore, the thickness of the hardened layer 2a can be molded with high precision, and consequently, the molded object 2 can be molded with high precision. It can be molded well.

[0033] Furthermore, each time the formation of the hardened layer 2a is completed, the lifting control unit 31 controls the platform 12 and In order to temporarily raise the partition wall 13 above the photocurable resin 1, the platform 12 and the partition wall Gas is introduced inside the wall 13, forming an airtight space. Therefore, the hardened layer 2 The thickness of a can be molded with high precision, and consequently, the molded object 2 can be molded with high precision. Cut.

[0034] Furthermore, the lifting control unit 31 and the irradiation control unit 32 are responsible for the formation of the photocurable resin layer 1a and the cured layer The formation of 2a is performed alternately, and multiple hardened layers 2a are stacked on the platform 12 to create a fabricated object. To form part 2, the molded object 2 can be formed with high precision.

[0035] Furthermore, the stereolithography apparatus 10 comprises at least a build tank 11, a platform 12, and a partition wall 13. A chamber 40 that houses the light irradiation unit 20, and a chamber pressure regulator that adjusts the internal pressure of the chamber 40. It comprises an adjustment unit 41 and a chamber pressure control unit 33 that controls the chamber pressure adjustment unit 41. Therefore, by adjusting the internal pressure of the chamber 40, the position of the lower surface 3A of space 3 is moved to the lower surface 13 of partition wall 13. It can be aligned with A, and the photocurable resin layer 1a can be precisely defined to a predetermined thickness T. Therefore, the thickness of the hardened layer 2a can be molded with high precision, and consequently, the molded object 2 can be molded with high precision. It can be molded well. [Second Embodiment] Next, a stereolithography apparatus according to the second embodiment will be described. Figure 8 shows the second embodiment. This is a schematic diagram showing the basic configuration of a light-curing 3D printer. The configuration is the same as the embodiment described above. The same symbol is used to omit the explanation.

[0036] As in the stereolithography apparatus of the first embodiment described above, in the molding tank 11 in which the photocurable resin 1 is stored The platform 12 and the bulkhead 13 work together to accommodate the molded object 2, which has a hardened layer 2a laminated onto it. A space (airtight space) 3 is provided, and between the lower surface 3A of this space 3 and the light-transmitting plate 14, In a configuration in which a photocurable resin layer 1a of a predetermined thickness T corresponding to the number of layers is formed, the molded object 2 is made with high precision. It can be molded, for example, the lower surface 13A of the partition wall 13 that forms space 3 and the hardened structure If a discrepancy occurs in the height of the lower surface 2A of the shape 2, the cured shape 2 and the photocurable resin layer 1a A problem is anticipated where the parts cannot make contact, resulting in manufacturing defects.

[0037] Therefore, in this second embodiment, the stereolithography apparatus 110 is configured as shown in Figure 8, with a molding tank 1 1, platform 12, bulkhead 13, light irradiation unit 20, and air cylinder (intake / exhaust unit) It comprises a 50 and a control unit 130. The control unit 130 also includes a lifting control unit 31 and an irradiation control unit. It comprises section 32 and a supply and exhaust control unit 133.

[0038] The air cylinder 50 is separated from the platform 12 and the bulkhead 13 through the hose 51. It is in communication with the space 3. The air cylinder 50 is, for example, a piston inside a cylindrical cylinder body It has a supply and exhaust control unit 133, for example, the liquid of the photocurable resin layer 1a on the inside of the partition wall 13. By monitoring the position of the surface and, accordingly, changing the position of the piston in the axial direction, The gas inside the cylinder is introduced into space 3, or discharged from space 3. Intake and exhaust control unit 1 33, through the operation of the air cylinder 50, raises the liquid level of the photocurable resin layer 1a to the lower surface 2 of the molded object 2. Perform an action to bring A into contact with it.

[0039] Next, the manufacturing method of the molded object according to the second embodiment will be described. Here, the air cylinder 5 The operation of 0 will be explained in detail. As mentioned above, the lifting control unit 31 and the irradiation control unit 32 This involves alternately forming a photocurable resin layer 1a and a cured layer 2a, thereby creating the nth layer (n is The object 2 is formed by laminating the (n+1)th hardened layer 2a onto a hardened layer 2a of a natural number.

[0040] Here, between the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 and the light-transmitting plate 14 Once a photocurable resin layer 1a of a predetermined thickness T is formed, as shown in Figure 8, the supply and exhaust control unit 13 3 operates the air cylinder 50. That is, the intake and exhaust control unit 133 controls the photocurable resin The liquid level in layer 1a is monitored by a sensor, and the air cylinder 50 controls the gas in space 3 to a predetermined position. Discharge the amount and slightly raise the liquid level of the photocurable resin layer 1a to the already cured molded object 2. The lower surface 2A and the photocurable resin layer 1a are brought into contact. Subsequently, the air supply and exhaust control unit 133 controls the air supply and exhaust. Linda 50 supplies a predetermined amount of gas to space 3, thereby setting the thickness of the photocurable resin layer 1a to a predetermined thickness. Reduce to T. In this case, the photocurable resin layer 1a has already hardened due to surface tension. The lower surface 2A of the molded object 2 maintains contact with the object.

[0041] Therefore, if the irradiation control unit 32 is operated in this state to form a new cured layer 2a, Even if present, this hardened layer 2a is laminated to form the fabricated object 2, thus suppressing fabrication defects and improving precision. A well-formed object 2 can be molded.

[0042] As described above, the stereolithography apparatus 110 according to the second embodiment stores the photocurable resin 1 and has light on the bottom surface. A molding tank 11 is provided with a light-transmitting plate 14, and a photocurable resin is transferred through the light-transmitting plate 14. A light irradiation unit 20 that irradiates light L to cure 1, and a molding tank 1 opposite the light transmission plate 14. It is vertically adjustable relative to 1 and holds the fabricated object 2, which is formed by laminating hardened layers 2a by irradiation with light L. A platform 12, and a cylindrical structure that can be raised and lowered relative to the platform 12. It is formed and placed on the outside of the platform 12 via an airtight member 17, and the platform A partition wall 13 works in cooperation with the element 12 to form an airtight space 3, and gas is supplied to or discharged from the space 3. The air cylinder 50 performs the operation, and the platform 12 and bulkhead 13 are raised and lowered respectively. A predetermined thickness T is between the lower surface 13A of the wall 13 and the lower surface 3A of the space 3 and the light-transmitting plate 14. The lifting control unit 31 forms the photocurable resin layer 1a, and the operation of the air cylinder 50 causes the photocuring to occur. A supply and exhaust control unit 133 brings the liquid surface of the chemical resin layer 1a into contact with the lower surface 2A of the molded object 2, and Light L corresponding to the cross-sectional shape of 2 at a predetermined height is shone from the light irradiation unit 20 onto the photocurable resin layer 1a. The system includes an irradiation control unit 32 that irradiates to form a hardened layer 2a.

[0043] According to this configuration, the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 and the light-transmitting plate 1 A photocurable resin layer 1a of a predetermined thickness T is formed between 4 and the other, and this photocurable resin layer 1a is formed into a predetermined shape Because it hardens in a specific way, the thickness of the hardened layer 2a can be precisely molded, and consequently the fabricated object 2 can be molded with high precision. Furthermore, with this configuration, the previously molded hardened layer 2 Since a space 3 can be provided around a, light irradiated through the light-transmitting plate 14 L can prevent the problem of excess photocurable resin 1 curing, and the molded object 2 can be manufactured with high precision. It can be molded in a way that allows for easy formation. Furthermore, with this configuration, the platform 12 and the bulkhead 13 Because it is equipped with an air cylinder 50 that supplies and exhausts gas to the partitioned space 3, the photocurable resin layer 1 By adjusting the liquid level of a, the photocurable resin layer 1a and the already cured lower surface 2A of the molded object 2 Maintain the contact state. Therefore, it is possible to suppress molding defects and form a highly accurate molded object 2. can.

[0044] Furthermore, the lifting control unit 31, the supply and exhaust control unit 133, and the irradiation control unit 32 are made of a photocurable resin layer. Formation of 1a, contact between the liquid surface of the photocurable resin layer 1a and the lower surface 2A of the molded object 2, and cured layer 2a By repeatedly performing the formation process, molding defects are suppressed and the molded object 2 is formed with high precision. It is possible. [Third Embodiment] Next, a stereolithography apparatus according to the third embodiment will be described. Figure 9 shows the stereolithography apparatus according to the third embodiment. This is a schematic diagram showing the basic configuration of a light-curing 3D printer. The configuration is the same as the embodiment described above. The same symbol is used to omit the explanation.

[0045] In the stereolithography apparatus of the first and second embodiments described above, the photocurable resin 1 is stored in the molding tank 11 The platform 12 and the bulkhead 13 work together to accommodate the molded object 2, which has a hardened layer 2a laminated onto it. A space (airtight space) 3 is provided, and between the lower surface 3A of this space 3 and the light-transmitting plate 14, A photocurable resin layer 1a of a predetermined thickness T corresponding to the number of layers is formed. In this configuration, Each time the hardened layer 2a is formed, the partition wall 13 is lowered relative to the platform 12 by a predetermined thickness T. It is necessary to do so. In this case, the predetermined thickness T is set to, for example, a few μm, A potential problem is that a precise lifting mechanism will be required.

[0046] Therefore, in this third embodiment, the stereolithography apparatus 210 is configured as shown in Figure 9, with a molding tank 1 It comprises 1, platform 12, light irradiation unit 20, and control unit 230. The 230 comprises a lifting control unit 231 and an irradiation control unit 232.

[0047] In this third embodiment, the stereolithography apparatus 210, instead of having a partition wall in its apparatus configuration, A cylindrical bulkhead 213 is formed around the structure 2 of the platform 12 together with the structure 2. The platform 12 works in cooperation with the molded bulkhead 213 to create space (air). It forms a dense space (3).

[0048] Furthermore, the lifting control unit 231 controls the operation of the platform lifting mechanism 15. The lifting control unit 231 controls the height position of the platform 12. The lifting control unit 231 controls the bulkhead 213 when it is formed. By raising and lowering the platform 12, the bottom surface of the bulkhead 213 and the lower surface of the space 3 and light A photocurable resin layer of a predetermined thickness is formed between the transparent plate 14 and the resin layer.

[0049] The irradiation control unit 232, for example, based on 3D shape data, modifies the fabricated object 2 in predetermined height increments. The light irradiation pattern showing the cross-sectional shape of the partition wall 213 is calculated, and the light source 21 and image forming element The irradiation control unit 232 controls the 22 and irradiates the photocurable resin with light. Light corresponding to each cross-sectional shape at a predetermined height position of the partition wall 213 is transmitted between the lower surface of the space 3 and the light-transmitting space. By irradiating the photocurable resin layer between the plate 14 and the curing plate, a cured layer of a predetermined thickness is formed. It is possible.

[0050] Next, with reference to Figures 10 to 14, the manufacturing method of the molded object according to the third embodiment will be described. These figures schematically show a part of the stereolithography apparatus 10 shown in Figure 9. First, As shown in Figure 10, the lifting control unit 231 moves from the molding tank 11 where the photocurable resin 1 is stored. The elevated platform 12 is lowered into the molding tank 11, and below the platform 12 It is positioned so that there is a predetermined distance T between surface 12A and the light-transmitting plate 14. In this case, Between the rat platform 12 and the light-transmitting plate 14, light of the same predetermined thickness T as a predetermined distance T is present. A curable resin layer 1a is formed.

[0051] Next, the irradiation control unit 232 controls the object 2 to be molded and a cylindrical container capable of housing this object 2. Based on the 3D shape data of the partition wall 213, at a predetermined height of the molded object 2 and the partition wall 213 The irradiation pattern showing the cross-sectional shape is calculated, and the cross-sectional shape of the first layer of the fabricated object 2 and partition wall 213 is determined. The light L corresponding to this is irradiated onto the photocurable resin layer 1a through the light-transmitting plate 14. Therefore, the photocurable resin layer 1a has the same cross-sectional shape as the first layer of the molded object 2 and the partition wall 213. It hardens. Therefore, as shown in Figure 11, the platform 12 has the molded object 2 and The first layers of the partition wall 213, hardened layers 2a and 213a of a predetermined thickness T, are respectively held in place.

[0052] Next, the lifting control unit 231 raises the platform 12, as shown in Figure 12. First, it is placed at a position higher than the molding tank 11. Here, the hardened layer 2a of the molded object 2 and the partition wall 2 The 13 hardened layers 213a are each molded to the same height with a predetermined thickness T. The lower surface 2aA of the hardened layer 2a of object 2 and the lower surface 213aA of the hardened layer 213a of the partition wall 213 are flush. In addition, the platform 12 and partition wall 2 are located around the molded object 2 (hardened layer 2a). A space (airtight space) 3 is formed, partitioned by 13 (hardened layer 213a).

[0053] Next, the lifting control unit 231 moves the platform 12 into the molding tank 11, below the partition wall 213. The surface 213A and the light-transmitting plate 14 are lowered vertically until a predetermined distance T is reached between them. In this case, the space 3 partitioned by the platform 12 and the bulkhead 213 becomes an airtight space, As shown in Figure 13, a uniform predetermined thickness T is formed between the lower surface 3A of space 3 and the light-transmitting plate 14. A photocurable resin layer 1a is formed.

[0054] Next, the irradiation control unit 232 corresponds to the cross-sectional shape of the second layer of the fabricated object 2 and the partition wall 213. Light L is irradiated onto the photocurable resin layer 1a through the light-transmitting plate 14. This allows the photocuring process to be completed. As shown in Figure 14, the chemical resin layer 1a hardens to the same cross-sectional shape as the second layer and reaches a predetermined thickness. The second layer of T is laminated onto the first layer to form hardened layers 2a and 213a. In this way, In this embodiment, the lower surface 213aA of the partition wall 213 and the space 3 are molded together with the molded object 2. A photocurable resin layer 1a of a predetermined thickness T is formed between the lower surface 3A and the light-transmitting plate 14. The photocurable resin layer 1a is cured into a predetermined shape. Therefore, each of the molded object 2 and the partition wall 213 The thickness of the hardened layers 2a and 213a can be precisely molded, and consequently, the molded object 2 can be molded with high precision. It can be molded. In addition, in this embodiment, a cavity is formed around the previously molded hardened layer 2a. Since a gap 3 can be provided, the light L irradiated through the light-transmitting plate 14 is excess light This prevents defects in curing the curable resin 1. In addition, in this embodiment, In order to form the bulkhead 213 together with object 2, a separate bulkhead is provided around the platform 12. This eliminates the need for additional components and simplifies the configuration of the stereolithography apparatus 210.

[0055] Furthermore, the lifting control unit 231 and the irradiation control unit 232 are responsible for the formation of the photocurable resin layer 1a and the fabrication The formation of hardened layers 2a and 213a of the shape 2 and partition wall 213 is carried out alternately, and the nth layer ( The n+1th layer of hardened layer 2a, 213a is laminated onto hardened layers 2a, 213a (where n is a natural number). The molded object 2 and the partition wall 213 can be formed using this method.

[0056] As described above, the stereolithography apparatus 210 according to the third embodiment stores the photocurable resin 1 and has light on the bottom surface. A molding tank 11 is provided with a light-transmitting plate 14, and a photocurable resin is transferred through the light-transmitting plate 14. A light irradiation unit 20 that irradiates light L to cure 1, and a molding tank 1 opposite the light transmission plate 14. It is made possible to move up and down relative to 1, and by irradiation with light L, the surrounding area of ​​the molded object 2 together with the molded object 2. It holds the cylindrical partition wall 213 formed within the enclosure and works in cooperation with the partition wall 213 to form an airtight space 3. Platform 12, and platform 12 is raised and lowered, and the lower surface 213A of bulkhead 213 A photocurable resin layer 1a of a predetermined thickness T is placed between the lower surface 3A of space 3 and the light-transmitting plate 14. The lifting control unit 231 to be formed, and the cross-sectional shape of the molded object 2 and partition wall 213 at a predetermined height. The light L corresponding to the cured layer 2a is irradiated from the light irradiation unit 20 onto the photocurable resin layer 1a, and each cured layer 2a, 2 It includes an irradiation control unit 232 that forms 13a.

[0057] According to this configuration, the lower surface 213aA and air of the bulkhead 213 that are molded together with the molded object 2 A photocurable resin layer 1a of a predetermined thickness T is formed between the lower surface 3A of the gap 3 and the light-transmitting plate 14. This photocurable resin layer 1a is then cured into a predetermined shape. Therefore, the molded object 2 and the partition wall 21 The thickness of each hardened layer 2a and 213a in 3 can be precisely molded, and consequently the fabricated object 2 can be formed. It can be molded with high precision. Also, in this embodiment, the periphery of the previously molded hardened layer 2a Since a space 3 can be provided in the enclosure, the light L irradiated through the light-transmitting plate 14 does not remain. This prevents the problem of curing excess photocurable resin 1. Furthermore, in this embodiment, In order to mold the bulkhead 213 together with the molded object 2, the bulkhead is molded separately around the platform 12. This eliminates the need to install additional components, simplifying the configuration of the stereolithography apparatus 210.

[0058] Furthermore, the lifting control unit 231 controls the platform each time the formation of the hardened layers 2a and 213a is completed. In order to raise M12 to above the photocurable resin 1, it is molded onto the platform 12. Gas is introduced inside the partition wall 213, forming an airtight space. Therefore, The thickness of the hardened layers 2a and 213a can be precisely molded, and consequently, the molded object 2 can be molded with high precision. It can be molded into shape.

[0059] Furthermore, the lifting control unit 231 and the irradiation control unit 232 are responsible for the formation of the photocurable resin layer 1a and hardening. The formation of hardened layers 2a and 213a is carried out alternately, and multiple hardened layers 2a are formed on the platform 12. To form the object 2 and the partition wall 213 by stacking 213a respectively, a stereolithography apparatus 21 The device configuration of 0 can be simplified while accurately forming the object 2.

[0060] Furthermore, the lower surface 2A of the molded object 2 and the lower surface 213A of the partition wall 213 are always flush. Therefore, highly accurate molded objects 2 can be easily formed. [Fourth Embodiment] Next, a stereolithography apparatus according to the fourth embodiment will be described. Figure 15 shows the stereolithography apparatus according to the fourth embodiment. This is a schematic diagram showing the basic configuration of such a stereolithography apparatus. Figure 16 shows the stereolithography apparatus according to the fourth embodiment. This is a diagram illustrating the operation of the suction mechanism of the device. In such cases, the same symbol is used, and the explanation is omitted.

[0061] As in the stereolithography apparatus of the first and second embodiments described above, a molding tank 1 storing a photocurable resin 1 Within 1, the platform 12 and the partition wall 13 work together to form a structure 2 with a hardened layer 2a. A containment space (airtight space) 3 is provided, and between the lower surface 3A of this space 3 and the light-transmitting plate 14 In a configuration in which a photocurable resin layer 1a of a predetermined thickness T, equivalent to one layer, is formed, the molded object 2 is precisely It can be molded to a good degree, but for example, if the previously hardened molded object 2 is unhardened or partially hardened by photocuring, If chemical resin remains, when curing the next hardened layer, the remaining uncured or other photocurable resin will remain. A potential problem is that the fat itself hardens along with the material, making it impossible to perform high-precision molding.

[0062] Therefore, in this fourth embodiment, the stereolithography apparatus 310 has a build tank as shown in Figure 15. It comprises 11, a platform 12, a light irradiation unit 20, a suction mechanism 60, and a control unit 330. Furthermore, the control unit 330 includes the lifting control unit 231, the irradiation control unit 232, and the suction control unit 3 It is equipped with 33.

[0063] The suction mechanism 60 generates negative pressure, thereby removing uncured or other photohardened material adhering to the molded object 2. This device removes chemical resins by suction. As shown in Figure 15, the suction mechanism 60 has an upper surface The open dish portion 61 and the hose 63 connected to this dish portion 61 create negative pressure inside the dish portion 61. It comprises a suction unit 62 that generates a suction and a moving mechanism 64 that moves the dish unit 61, for example, in a horizontal direction. ru.

[0064] In this fourth embodiment, similar to the third embodiment, the stereolithography apparatus 310 has the following apparatus configuration: Instead of providing a bulkhead, a tube is constructed around the structure 2 of the platform 12 together with the structure 2. The structure is designed to form a bulkhead 313. The platform 12 is formed by the molded bulkhead 3 It works in cooperation with 13 to form space (airtight space) 3. This partition wall 313 is integral with the molded object 2. They are molded. The procedure for molding these molded objects 2 and the partition wall 313 is described in the third embodiment. This is equivalent to what is described in [reference]. Furthermore, this partition wall 313 is integrated with the target object 2. Therefore, the final step is to separate the bulkhead 313 from the molded object 2.

[0065] On the other hand, the dish portion 61 of the suction mechanism 60 is formed to be the same size as the partition wall 313 described above, as shown in Figure As shown in 16, the suction mechanism 60 is positioned below the platform 12, and this platform When the platform 12 is lowered, the bulkhead 313 is sandwiched between the platform 12 and the dish portion 61. As described above, the partition wall 313 is integrally molded with the molded object 2, therefore the molded object 2 is The platform 12 and the dish portion 61 are supported via the partition wall 313. 313 also functions as a support structure for the printed object 2.

[0066] Furthermore, in this configuration, when the bulkhead 313 is sandwiched between the platform 12 and the dish portion 61, The edge of the dish portion 61 abuts against the lower surface (bottom surface) 313A of the partition wall 313, forming a closed space. Therefore, when the suction unit 62 is activated, a negative pressure can be created in this closed space, and the molded object 2 The uncured photocurable resin 70 that has adhered to the surface can be easily suctioned and removed.

[0067] As described above, the stereolithography apparatus 310 according to the fourth embodiment stores the photocurable resin 1 and has light on the bottom surface. A molding tank 11 is provided with a light-transmitting plate 14, and a photocurable resin is transferred through the light-transmitting plate 14. A light irradiation unit 20 that irradiates light L to cure 1, and a molding tank 1 opposite the light transmission plate 14. It is made possible to move up and down relative to 1, and by irradiation with light L, the surrounding area of ​​the molded object 2 together with the molded object 2. It holds the cylindrical partition wall 313 that is formed around it, and works in cooperation with the partition wall 313 to form an airtight space 3. The platform 12 and the uncured photocurable resin 70 adhering to the molded object 2 are suctioned and removed. The suction mechanism 60 raises and lowers the platform 12, and the bottom surface 313A of the bulkhead 313 and A photocurable resin layer 1a of a predetermined thickness T is formed between the lower surface 3A of space 3 and the light-transmitting plate 14. The lifting control unit 231 controls the cross-sectional shape of the molded object 2 and the partition wall 313 at a predetermined height. The corresponding light L is irradiated from the light irradiation unit 20 onto the photocurable resin layer 1a to form a single cured layer. The irradiation control unit 232 and the platform 12 are positioned above the photocurable resin 1. The rat platform 12 is positioned below the rat platform 333, which operates the suction mechanism 60, and the system is equipped with a suction control unit 333. El.

[0068] According to this configuration, the lower surface 313A of the partition wall 313 and the lower surface 3A of the space 3 and the light-transmitting surface A photocurable resin layer 1a of a predetermined thickness T is formed between the to 14 and the to 14, and this photocurable resin layer 1a is To harden into a fixed shape, the thickness of each hardened layer of the molded object 2 and the partition wall 313 is precisely shaped. This allows for the precise molding of the object 2. This allows a space 3 to be created around the hardened layer of the previously molded object 2, thus allowing light to pass through. This prevents the problem of excess light L irradiated through the overplate 14 curing the excess photocurable resin 1. It can be stopped, and the molded object 2 can be formed with high precision. Furthermore, the platform When 12 is positioned above the photocurable resin 1, it is placed below the platform 12 and the molding process is carried out. The suction mechanism 60 is activated to suck up and remove the uncured photocurable resin 70 adhering to object 2. Therefore, the uncured photocurable resin 70 adhering to the molded object 2 is prevented from curing separately. The 2nd object can be molded with high precision.

[0069] The partition wall 313 is integrally molded with the molded object 2, and during the operation of the suction mechanism 60, the suction mechanism 6 It is held between the dish portion 61 of part 0 and the platform 12, and functions as a support for the molded object 2. Therefore, the molded object 2 will not detach from the platform 12, at least during the suction operation. This can be easily prevented.

[0070] The suction mechanism 60 has a dish portion 61 with an open top surface, and this dish portion 61 is on the lower surface 3 of the partition wall 313 When the suction unit 62 is activated to contact 13A and form a closed space, negative energy is released within this closed space. It can be compressed, and the uncured photocurable resin 70 adhering to the molded object 2 can be easily sucked and removed. It is possible to leave.

[0071] Furthermore, the lifting control unit 231, the irradiation control unit 232, and the suction control unit 333 are made of photocurable resin. The process of forming layer 1a, forming a cured layer, and suctioning the uncured photocurable resin 70 is repeatedly performed. To form the structure 2 and the partition wall 313 by laminating multiple hardened layers onto the platform 12 Therefore, the configuration of the stereolithography apparatus 310 can be simplified while accurately forming the object 2. Cut.

[0072] We have described the stereolithography apparatus and the method for manufacturing the manufactured object according to the present invention, but as mentioned above, In addition to the embodiments described above, the invention may be implemented in various other forms. The components may be combined as appropriate. For example, the chamber 40 in the first embodiment, inside the chamber The pressure adjustment unit 41 and the chamber internal pressure control unit 33 are manufactured using stereolithography according to the second to fourth embodiments. They may be combined in the same way, or the air cylinder 50 and the supply and exhaust control unit 13 in the second embodiment 3 may be combined with the stereolithography apparatus according to the first, third, and fourth embodiments. Furthermore, the suction mechanism 60 and suction control unit 333 in the fourth embodiment are the same as those in the first to third embodiments. It may be combined with the stereolithography apparatus according to the embodiment.

[0073] Furthermore, the components of the stereolithography apparatus shown in the diagram are conceptual in terms of function and not necessarily physical. The configuration does not have to be as shown in the diagram. In other words, the specific form of each device is not as shown in the diagram. Not limited to this, depending on the processing load and usage status of each device, all or part of it may be used as an arbitrary unit. They may be functionally or physically dispersed or integrated at different locations.

[0074] The configuration of the control unit of the stereolithography device is, for example, as software, loaded into memory. This is implemented by a program, etc. In the above embodiment, these hardware or software It was explained as a functional block realized through the cooperation of software. In other words, these Regarding the Nou Block, it can be hardware only, software only, or a combination of both. It can be realized in various forms through collaboration. [Explanation of Symbols]

[0075] 1 Photocurable resin 1a Photocurable resin layer 2 Three-dimensional objects (modeled objects) 2a hardened layer 3. Space (Airtight Space) 3A Bottom 10, 110, 210, 310 stereolithography equipment 11 Modeling tank 12 Platforms 13, 213, 313 Bulkhead 13A, 213A, 313A Lower surface (bottom surface) 14. Light-transmitting plate (light-transmitting part) 15. Platform lifting mechanism 16. Partition Wall Lifting Mechanism 17 Airtight components 20 Light-irradiating section 21 Light source 22 Image Formation 23 Reflective mirror 24 Projection Lenses 30, 130, 230, 330 Control Unit 31, 231 Lifting control unit 32,232 Irradiation control unit 33 Chamber pressure control unit 40 Chambers 41 Chamber pressure adjustment section 50 Air cylinder (intake and exhaust section) 60 Suction mechanism 61 Dish section 62 Suction part 63 Hose 64 Moving mechanism 70 Uncured photocurable resin 133 Intake and Exhaust Control Unit 333 Suction Control Unit

Claims

[Claim 1] A molding tank for storing photocurable resin, with a light-transmitting section at the bottom, A light irradiation unit that irradiates the photocurable resin with light through the light-transmitting unit, A platform facing the light-transmitting section and movable up and down relative to the molding tank, It is made to be able to move up and down relative to the platform, and is formed in a cylindrical shape and the platform It is positioned on the outside of the platform via an airtight member, and works in cooperation with the platform to form an airtight space. The partitions that make up the space, The platform and the bulkhead are raised and lowered, and the bottom surface of the bulkhead and the air A lifting control unit that forms a photocurable resin layer of a predetermined thickness between the lower surface of the enclosed space and the light-transmitting portion, 、 A chamber housing the molding layer, the light irradiation unit, the platform, and the partition wall, An internal pressure adjustment control unit for adjusting the internal pressure in the chamber, A stereolithography device equipped with [unspecified features].

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