JP3601535B1 - Manufacturing method of three-dimensional shaped object - Google Patents

Abstract

An object of the present invention is to reduce problems caused by excessive sintering.
A sintering layer is formed by irradiating a predetermined portion of a layer of an inorganic or organic powder material with a light beam to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, A removing step for removing the surface portion and / or unnecessary portion of the formed object up to this point is inserted into a plurality of steps of forming the sintered layer to form a required three-dimensional shaped object. The upper sintered layer of the plurality of sintered layers B formed in each of the molding cycles separated by the insertion of the removing step has a horizontal cross-sectional area larger than the horizontal cross-sectional area of the lower sintered layer. Overhang. The overhang prevents the over-sintered portion from sagging. Alternatively, the excess sintered portion is caused to flow into the concave portion below the overhanging portion.
[Selection diagram] Fig. 1

Description

  The present invention relates to a method for manufacturing a three-dimensionally shaped object by manufacturing a three-dimensionally shaped object by sintering and hardening a powder material with a light beam.

  There is a method of manufacturing a three-dimensionally shaped object known as an optical molding method. The manufacturing method disclosed in Japanese Patent No. 2620353 (Patent Document 1) irradiates a predetermined portion of a layer of an inorganic or organic powder material with a light beam and sinters (fuses) the powder at the corresponding portion. To form a sintered layer, a new layer of powdered material is coated on the sintered layer, and a predetermined portion of the powder layer is irradiated with a light beam to sinter the powder at the corresponding location to form a lower layer. By repeating the process of forming a new sintered layer integrated with the sintered layer, a powder sintered part (three-dimensional shaped object) in which multiple sintered layers are laminated and integrated is created. There is no so-called CAM device because a light beam is radiated based on the cross-sectional shape data of each layer generated by slicing a model, which is design data (CAD data) of a three-dimensional molded object, to a desired layer thickness. Manufactures three-dimensional shaped objects with arbitrary shapes Guests can be collected by, in comparison with the manufacturing process such as by cutting, it is possible to obtain a molded article rapidly desired shape.

  By the way, unnecessary powder adheres to the periphery of the portion which is sintered and hardened by irradiating the light beam, and the adhered powder forms a low-density surface layer on a molded article due to the transmitted heat. Will form. In order to remove the low-density surface layer and obtain a three-dimensionally shaped object having a smooth surface, the present applicant disclosed in Japanese Patent Application No. 2000-306546 the surface of a shaped object which had been formed so far after the formation of the sintered layer. It has been proposed to insert the step of removing the part and / or the unnecessary part during the multiple steps of forming the sintered layer. In this case, by repeatedly performing the creation of the sintered layer and the removal of the surface portion and / or unnecessary portions of the modeled object, the surface can be finished without being restricted by a drill length or the like.

  Here, assuming that the above-described removal step is inserted, the size (horizontal cross-sectional area) of each sintered layer is set to be larger than the original value so that the sintered layer has the original dimensions at the time of removal. Thus, a smooth and high-hardness surface can be reliably obtained, but the following problem newly arises.

That is, as shown in FIG. 16, a cutting tool 4 or the like is used to apply a cutting tool 4 or the like to a sintered layer block B composed of n layers of sintered layers formed for each molding cycle separated by the insertion of the removing step. And / or unnecessary portions are removed, and then when forming the n-layer sintered layer block B _{+ 1} , excessive powder surrounding the outer wall surface of the lower-cut sintered layer block B is excessively sintered. And stick like an icicle. Since the excessively sintered portion 17 remains without being removed in the removing step using the cutting tool 4 or the like for the sintered layer block B _{+ 1} thereon, the outer surface of the formed three-dimensional shaped object is removed. Is uneven due to the excessive sintering portion 17.

Of course, in the above-mentioned removing step, it is possible to cope with the problem by removing the excessively sintered portion 17 generated on the outer periphery of the upper portion of the lower sintered layer block B. Since the time required for the process increases and the time increases for each sintered layer block, the overall time increases considerably.
Japanese Patent No. 2620353

  The present invention has been made in view of the above points, and an object of the present invention is to provide a method of manufacturing a three-dimensionally shaped object that can reduce problems caused by excessive sintering.

According to the first aspect of the present invention, a predetermined portion of a layer of an inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding portion to form a sintered layer. It repeats forming a new sintered layer integrated with the lower layer by coating a new layer of powder material and irradiating a predetermined location with a light beam and sintering the powder at the corresponding location In addition, the removal step of removing the surface portion and / or unnecessary portion of the shaped object created up to that time after the formation of the sintered layer is inserted into the process of forming the sintered layer a plurality of times to obtain a required three-dimensional shaped object. In performing the shaping, the upper cross-sectional area of the plurality of sintered layers formed in each of the forming cycles separated by the insertion of the removing step is changed to the horizontal cross-sectional area of the lower sintered layer. Contact by flared outward from the lower side of the sintered layer as larger than the cross-sectional area , An unnecessary portion of the projecting portion has a particular feature is removed in the removal step. The over-sintered portion is prevented from sagging in a concave portion on the outer periphery of the lower layer formed by the upper portion or the upper portion of the sintered layer block protruding outward.
At this time, among the plurality of sintered layers formed in each of the molding cycles separated by the insertion of the removing step, the lower sintered layer is surrounded by a contour line offset inward by a predetermined amount from a predetermined contour. The upper sintered layer is formed by performing a light beam operation in the region, and the horizontal cross-sectional area of the upper sintered layer is larger than the horizontal cross-sectional area of the lower sintered layer, and the outer sintered layer is located outside the lower sintered layer. It is preferable to overhang.

Further, according to the invention of claim 3 , a predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding portion to form a sintered layer. Repeating to form a new sintered layer integrated with the lower sintered layer by sintering the powder at the corresponding location by irradiating a light beam to a predetermined place by coating a new layer of material After the formation of the sintered layer, the step of removing the surface portion and / or unnecessary portion of the shaped object created so far is inserted into the process of forming the sintered layer a plurality of times to form a required three-dimensional shaped object. In performing, the removal process is performed on the uppermost sintered layer of the plurality of sintered layers formed in each of the molding cycles separated by the insertion of the removal process, and the next powder layer is formed. Conducting light beam scanning to trace the outline of the part to be sintered Presintered part was formed, after which the is characterized in carrying out the formation of the sintered layer by performing a light beam irradiated to the portion to be sintering of the powder layer. The sintering is performed after forming the temporary sintering portion for improving the heat conduction to the already sintered portion in the outline, so that the excessively sintering portion becomes large and the sag does not occur.

Further, according to the invention of claim 4 , a predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding portion to form a sintered layer. Repeating to form a new sintered layer integrated with the lower sintered layer by sintering the powder at the corresponding location by irradiating a light beam to a predetermined place by coating a new layer of material After the formation of the sintered layer, the step of removing the surface portion and / or unnecessary portion of the shaped object created so far is inserted into the process of forming the sintered layer a plurality of times to form a required three-dimensional shaped object. When performing the removal process, the area larger than the cross-sectional area of the modeled object is placed on the uppermost sintered layer of the plurality of sintered layers formed in each of the molding cycles separated by the insertion of the removal process. And place the thin plate on the part sintered so far. Wear and, thereafter, has a particular feature to remove an unnecessary portion of the thin plate in the subsequent removal process with the process proceeds to the next molding cycle. The thin plate prevents the excessively sintered portion from sagging.

Further, according to the invention of claim 5 , a predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding portion to form a sintered layer. Repeating to form a new sintered layer integrated with the lower sintered layer by sintering the powder at the corresponding location by irradiating a light beam to a predetermined place by coating a new layer of material After the formation of the sintered layer, the step of removing the surface portion and / or unnecessary portion of the shaped object created so far is inserted into the process of forming the sintered layer a plurality of times to form a required three-dimensional shaped object. Is characterized in that a surface treatment for preventing powder from adhering to the surface of the modeled object is performed immediately after the removing step. This is to prevent the excessively sintered portion from increasing due to the attached powder.

Further, according to the invention of claim 6 , a predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding portion to form a sintered layer. Repeating to form a new sintered layer integrated with the lower sintered layer by sintering the powder at the corresponding location by irradiating a light beam to a predetermined place by coating a new layer of material After the formation of the sintered layer, the step of removing the surface portion and / or unnecessary portion of the shaped object created so far is inserted into the process of forming the sintered layer a plurality of times to form a required three-dimensional shaped object. In carrying out the method, immediately after the removing step, the gap formed between the outer surface of the modeled object and the powder layer in the removing step is characterized by being filled with a material that does not easily adhere to the modeled object. The sagging excess sintered portion is prevented from being generated by the filled material.

Further, according to the invention of claim 7 , a predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding portion to form a sintered layer. Repeating to form a new sintered layer integrated with the lower sintered layer by sintering the powder at the corresponding location by irradiating a light beam to a predetermined place by coating a new layer of material After the formation of the sintered layer, the step of removing the surface portion and / or unnecessary portion of the shaped object created so far is inserted into the process of forming the sintered layer a plurality of times to form a required three-dimensional shaped object. Is characterized in that a mask plate that covers the periphery of the modeled object is disposed immediately after the removing step. This prevents generation of an excessively sintered portion hanging down from the mask plate.

  In the present invention, the sintering layer formed first on the outer layer portion formed on the outer layer of the sintered layer block or on the outer periphery of the lower layer formed by the upper layer projecting, or on the powder layer on the sintered layer block. Bonded parts, thin plates placed on the sintered layer block, materials that do not easily adhere to the formed object filled in the gap created between the outer surface of the formed object and the powder layer, or mask plates that cover the periphery of the formed object This is to prevent the excessively sintered portion from sagging, and it is not necessary to deeply perform the processing for removing the excessively sintered portion, so that the time required for the removing step can be shortened.

  FIG. 14 shows an apparatus for manufacturing a three-dimensionally shaped object by stereolithography. The inorganic material supplied on a stage for modeling, that is, on an elevating table 20 which moves up and down in a space whose outer periphery is surrounded by a modeling tank 25. Alternatively, a powder layer forming means 2 for forming a powder layer 10 having a predetermined thickness Δt1 by leveling an organic powder material with a squeezing blade 21 and a scanning optical system such as a galvanometer mirror 31 for outputting a laser output from a laser oscillator 30 And a sintering layer forming means 3 for sintering the powder by irradiating the powder layer 10 with the sintering layer 11 to form a sintering layer 11. And a cutting and removing means 4 provided with a milling head 41.

  The production of the three-dimensionally shaped object in this case will be described with reference to FIG. 15. By supplying a powder material to the surface of the molding base 22 on the upper surface of the elevating table 20 and leveling it with the blade 21, the first-layer powder The layer 10 is formed, and a portion of the powder layer 10 to be cured is irradiated with a light beam (laser) L to sinter the powder to form a sintered layer 11 integrated with the base 22.

  Thereafter, the lifting table 20 is slightly lowered, and the powder material is supplied again and leveled by the blade 21 to form the second powder layer 10, and a light beam (laser) is applied to a portion of the powder layer 10 where the powder layer is to be cured. L is irradiated to sinter the powder to form a sintered layer 11 integrated with the lower sintered layer 11. The elevating table 20 is lowered to form a new powder layer 10, and the light beam Is applied to repeat the process of turning the required portion into the sintered layer 11, thereby producing a target three-dimensionally shaped object.

  The irradiation path of the light beam is created in advance from the data of the three-dimensional CAD model. That is, similarly to the conventional one, the contour shape data of each section obtained by slicing the STL data generated from the three-dimensional CAD model at an equal pitch (for example, 0.05 mm) is used. At this time, it is preferable to irradiate the light beam so that at least the outermost surface of the three-dimensionally shaped object can be sintered so as to have a high density (a porosity of 5% or less).

  Then, the process of forming the powder layer 10 and irradiating a light beam to form the sintered layer 11 is repeated, but the total thickness of the sintered layer 11 is, for example, the milling head in the cutting and removing means 4. When the required value obtained from the tool length 41 or the like is reached, the cutting and removing means 4 is once operated to cut the surface portion (including the side surface) of the modeled object so far. For example, if the tool (ball end mill) of the milling head 41 is capable of cutting with a diameter of 1 mm, an effective blade length of 3 mm and a depth of 3 mm, and the powder layer 10 has a thickness Δt1 of 0.05 mm, for example, 50 layers When the sintered layer 11 is formed, the cutting and removing means 4 is operated.

  The low-density surface layer of the powder adhering to the surface of the modeled object is removed by cutting by the cutting and removing means 4. At this time, the high-density portion is entirely formed on the surface of the modeled object by cutting down to the high-density portion. In this case, the sintered layer 11 is slightly larger than a desired shape. The cutting path by the cutting and removing unit 4 is created in advance from the three-dimensional CAD data, similarly to the irradiation path of the light beam. After the cutting and removal by the cutting and removing means 4 is performed, the formation of the powder layer 10 and the formation of the sintered layer 11 are repeated again.

  Here, in the present invention, a sintered layer block B composed of a plurality of sintered layers 11 formed for each molding cycle separated by the insertion of the cutting and removing step by the cutting and removing means 4 is provided on the upper layer side from the lower layer. The area to be sintered in each of the sintered layers 11 is determined so that the horizontal cross-sectional area of each of the sintered layers 11 is large and the upper layer protrudes outward. For example, as shown in FIG. 1, the size is gradually increased toward the upper layer side, or is increased through steps as shown in FIG. 2. However, FIGS. 1 and 2 only show the area to be sintered, and in fact, as described above, the over-sintered portion is additionally formed on the outer peripheral side, so that the shaped article obtained by sintering is formed. Does not have the shape as shown.

In sintering into such a shape, among the spots of the light beam L, as shown in FIG. 4C, the energy density E at which a sintered density ρ of 70 to 80% or more can be obtained. when the range and spot diameter 2LR, the lower end of each sintered layer block B for the scan range of the light beam L, as shown in FIG. 4 (a), in the three-dimensional CAD model M (see FIG. 3) Scanning is performed in a state in which the light beam L is offset inward from the contour by the radius Lr of the spot diameter of the light beam L, and the upper end side is located on the spot of the light beam L from the contour in the three-dimensional CAD model M as shown in FIG. By scanning while being offset outward by the radius Lr of the diameter, the overhang portion f can be formed. The upper layer portion having a large horizontal cross-sectional area and protruding outward prevents the excessively sintered portion from drooping from the sintered layer block B formed thereon.

  The upper portion which has a large horizontal cross-sectional area and protrudes outward has a large horizontal cross-sectional area of the upper portion of the next sintered layer block B when the sintering of the next sintered layer block B is completed. What is necessary is just to cut and remove it together with the excess sintering part in a state where the left part is left. Therefore, in FIGS. 1 and 2, the upper portion of the entire sintered layer block B projects outward with a large horizontal cross-sectional area. All are removed by cutting. In addition, FIGS. 1 and 2 do not show an excessively sintered portion generated during sintering as described above.

  By the way, the overhanging portion needs to be cut and removed later. However, the overhanging portion is only the upper layer portion of the sintered layer block B, and there is no overhanging portion and the dripping of the excessively sintered portion is caused by the sintering layer block B. As compared with the case where the entirety is removed, the trouble of cutting and removing is reduced.

  The formation of the overhanging portion as described above is not always performed on the side surface of the shaped object to be obtained, but is preferably performed according to the inclination angle. As shown in FIG. 5, the overhanging portion is formed only on the side surface (a, b, and c surfaces in the figure) where the inclination angle θ is larger than a required angle (for example, 85 °). Sintering is performed without forming a protruding portion on the side surface (the two surfaces in the figure) having a slope smaller than the above angle. In this case, the angle θ is determined by superimposing the horizontal section A1 at a certain height of the object to be obtained and the horizontal section A2 at a predetermined height from there, and determining the dimension P between the two sides. A calculation may be performed to determine whether the dimension is smaller than a predetermined value.

  In the case where the density of the over-sintered portion can be made the surface density required for the three-dimensional structure by transmitting sufficient light energy during sintering, as shown in FIG. The sintering target area on the side may be narrower than the range of the three-dimensional CAD model M, so that the upper layer side of each sintered layer block B relatively protrudes outward. That is, when the plurality of sintered layers 11 in the sintered layer block B are gradually formed, they are generated so as to surround the original sintering area and grow as the sintered layers 11 are stacked. The over-sintered portion 17 fills the concave portion on the outer periphery of the lower layer of the sintered layer 11.

  In this case, most of the over-sintered portion 17 is formed in the above-mentioned concave portion, a portion of the over-sintered portion only protrudes from the range of the three-dimensional CAD model M, and the lower layer side has already been cut and removed. It hardly hangs down on the outer periphery of the consolidation block B, so that the labor for cutting and removing can be greatly reduced.

  FIG. 7 shows another example. Here, in sintering a required portion of the next powder layer 10 after cutting and removing the sintered layer block B formed in each of the molding cycles separated by the insertion of the cutting and removing step, sintering should be performed first. The light beam L ′ is scanned along a contour such as an outer peripheral edge or an inner peripheral edge of the portion to form a temporarily sintered portion 18 which is a very small oversintered portion along the contour. Next, the area to be sintered surrounded by the temporary sintering section 18 is irradiated with the light beam L and sintered to form the sintered layer 11. Here, the light beam L ′ for forming the temporary sintering part 18 is reduced in energy or scanned at a higher speed than the light beam L for normal sintering to reduce the degree of sintering. deep.

  The temporary sintering portion 18 (small excessive sintering portion 17) formed along the contour forms a sintered layer in which heat H from the light beam L has already been formed upon irradiation of the light beam L for sintering. In order to escape to the block B, the excessive sintered portion 17 is prevented from growing large and hanging down on the outer surface of the lower sintered layer block B.

  8 and 9 show an example of another embodiment. Here, after the cutting and removing step by the cutting and removing means 4 for the sintered layer block B, the thin plate 7 which is an iron plate is placed on the sintered layer block B and the outer periphery generated as a trace of the tool passing during the cutting and removing step. The groove 19 is covered with the thin plate 7, and then a hole 70 is formed in the thin plate 7 and the sintered layer block B located below the thin plate 7 using the above-described tool for cutting and removing, and the hole 70 is filled with the powder material. The thin plate 7 and the sintered layer block B are fixed by irradiating the thin plate 7 with the light beam L.

  After that, the process proceeds to the next molding cycle to form the powder layer 10 and form the sintered layer 11 by sintering the required portion. At this time, since the thin plate 7 covers the groove 19, the excessively sintered portion does not hang down. Then, in the next cutting and removing step by the cutting and removing means 4, unnecessary portions of the thin plate 7 are also cut and removed.

  In addition, as shown in FIG. 10, a surface treatment for preventing the powder from being attached to the outer peripheral groove 19 generated as a trace of the tool when the cutting and removing means 4 removes the sintered layer block B is performed. You may. As this surface treatment, for example, an oxide film is formed on the upper wall surface of the sintered layer block B by irradiating a light beam La while blowing air or oxygen A, for example. If the powder is less likely to adhere due to such a surface treatment, the excessively sintered portion 17 becomes smaller because the excessively sintered portion 17 does not increase due to the adhered powder. Since the excessively sintered portion 17 is easily separated from the sintered layer block B, the excessively sintered portion 17 is also removed in the next cutting and removing step.

  Further, as shown in FIG. 11, the groove 19 formed as a trace of the passage of the tool at the time of cutting and removing is filled with a material C, for example, a ceramic powder, which is difficult to adhere to the sintered layer block B (sintered layer 11). Then, the next sintered layer 11 may be formed. Even if the over-sintered portion 17 is formed and tends to hang down, the material C prevents this, so that the over-sintered portion 17 does not occur on the outer periphery of the lower-layer sintered layer block 11.

  As shown in FIG. 12, the material C can be filled in the groove 19 by the dispenser 8 attached to the XY drive mechanism (the XY drive mechanism 40 in the cutting and removing means 4 can be used).

  As shown in FIG. 13, immediately after the cutting and removing by the cutting and removing means 4, the mask plate M having an opening having the same shape as the planar shape of the formed object (sintered layer block B) formed so far. Then, in this state, the next powder layer 10 and the sintered layer 11 may be formed. The mask plate M prevents the excessively sintered portion 17 from hanging down.

  In addition, as an inorganic powder material, an iron-based powder disclosed in JP-A-2001-152204 can be preferably used, and as an organic powder material, a thermoplastic resin mainly composed of nylon, ABS, or the like is used. Resin can be suitably used.

1 shows an example of an embodiment of the present invention, in which (a) is a perspective view and (b) is a cross-sectional view. FIGS. 3A and 3B show another example, in which FIG. 3A is a perspective view, and FIG. It is a perspective view of a three-dimensional CAD model. (a) and (b) are explanatory diagrams relating to offset, and (c) is an explanatory diagram of energy density and spot diameter. (a) is a perspective view of a model, and (b) is an explanatory view of the same. It is sectional drawing of an example of other embodiment. 9 shows an example of another embodiment, in which (a) is a cross-sectional view at the time of temporary sintering, and (b) is a cross-sectional view at the time of main sintering. FIG. 11 is an operation explanatory diagram of an example of another embodiment. It is operation | movement explanatory drawing same as the above. It is sectional drawing of an example of another embodiment. It is sectional drawing of an example of other further another Embodiment. (a) is a perspective view of the same, and (b) is a cross-sectional view of the same. (a) and (b) are perspective views of an example of a different embodiment. It is a perspective view which shows the whole structure of the manufacturing apparatus of a three-dimensional molded article. It is explanatory drawing of a basic operation same as the above. It is explanatory drawing of the problem of a conventional example.

Explanation of reference numerals

B sintered layer block 10 powder layer 11 sintered layer

Claims (7)

A predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding location to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, Inserting the removal process for removing the surface part and / or unnecessary part of the formed object up to the time of forming the required three-dimensional shaped object by inserting it into the process of forming the sintered layer a plurality of times, Of the plurality of sintered layers formed for each molding cycle separated by insertion, the upper sintered layer has a horizontal cross-sectional area larger than the horizontal cross-sectional area of the lower sintered layer . It was allowed overhang outside the sintered layer, unnecessary portions of the projecting portion Method for producing a three-dimensionally shaped object, and removing the above removing step. Of the plurality of sintered layers formed in each of the molding cycles separated by the insertion of the removing step, the lower sintered layer has a light emitting region in a region surrounded by a contour line offset inward from the predetermined contour by a predetermined amount. The upper sintered layer is formed by manipulating the beam, and the horizontal cross-sectional area of the upper sintered layer is larger than the horizontal cross-sectional area of the lower sintered layer, so that the upper sintered layer extends outward from the lower sintered layer. The method for producing a three-dimensionally shaped object according to claim 1, wherein: A predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding location to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, In order to form the required three-dimensionally shaped object by inserting the process of removing the surface part and / or unnecessary part of the formed object up to the multiple times of forming the sintered layer, inserting the removal process The outline of the part to be sintered for the powder layer to be formed next with the removal step interposed between the uppermost sintered layer of the plurality of sintered layers respectively formed for each molding cycle divided by Perform light beam scanning to form a temporary sintered part for heat conduction, After manufacturing method of three-dimensionally shaped object which is characterized in that the formation of the light beam irradiated by performing sintered layer to portions to be sintering of the powder layer. A predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding location to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, In order to form the required three-dimensionally shaped object by inserting the process of removing the surface part and / or unnecessary part of the formed object up to the multiple times of forming the sintered layer, inserting the removal process A thin plate having an area larger than the cross-sectional area of the molded object is placed on the uppermost sintered layer of the plurality of sintered layers formed in each of the molding cycles separated by The sheet is fixed to the previously sintered part, after which the next Method for producing a three-dimensionally shaped object, wherein in the next removing step removing an unnecessary portion of the thin plate with transitions to the cycle. A predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding location to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, Immediately after the removal process, insert the process of removing the surface part and / or unnecessary part of the modeled object created up to the time of forming the required three-dimensional shaped object by inserting it into the process of creating the sintered layer multiple times A surface treatment for preventing powder from adhering to the surface of the modeled object. A predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding location to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, Immediately after the removal process, insert the process of removing the surface part and / or unnecessary part of the modeled object created up to the time of forming the required three-dimensional shaped object by inserting it into the process of creating the sintered layer multiple times A method of manufacturing a three-dimensionally shaped object, characterized in that a gap formed between the outer surface of the object and the powder layer during the removing step is filled with a material that is difficult to adhere to the object. A predetermined portion of the layer of the inorganic or organic powder material is irradiated with a light beam to sinter the powder at the corresponding location to form a sintered layer, and a new layer of the powder material is coated on the sintered layer. By irradiating a light beam to a predetermined location to sinter the powder at the corresponding location, a new sintered layer integrated with the lower sintered layer is repeatedly formed, and after forming the sintered layer, Immediately after the removal process, insert the process of removing the surface part and / or unnecessary part of the modeled object created up to the time of forming the required three-dimensional shaped object by inserting it into the process of creating the sintered layer multiple times A method of manufacturing a three-dimensionally shaped object, comprising: disposing a mask plate for covering the periphery of the object.

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