WO2019009064A1

WO2019009064A1 - Additive layer manufacturing method

Info

Publication number: WO2019009064A1
Application number: PCT/JP2018/023299
Authority: WO
Inventors: 大輝栗原; 橋本　将臣
Original assignee: 株式会社エンプラス
Priority date: 2017-07-06
Filing date: 2018-06-19
Publication date: 2019-01-10

Abstract

[Problem] To provide an additive layer manufacturing method capable of simplifying operation control of an additive layer manufacturing apparatus and of easily creating high precision three-dimensional structures. [Solution] This method is provided with: a first step for creating a model for preparing correction values under the same conditions as the production conditions for the actual three dimensional structure; a second step for calculating the actual rate of change of the model for preparing correction values created in the first step; a third step for calculating the correction values for the three dimensional structure from the actual rate of change so that the three dimensional structure after shrinkage has a pre-designed shape; a fourth step for preparing 3D correction data using the correction values calculated in the third step; and a fifth step for operating the additive layer manufacturing apparatus using the 3D correction data.

Description

Additive manufacturing method

The present invention relates to an additive manufacturing method in which resin layers cured by light irradiation are stacked to produce a three-dimensional structure.

Photolithography, which is one of the lamination molding methods conventionally known, irradiates light (for example, laser light) to a liquid photocurable resin in a container in a curing step, and the molding table is irradiated with light The first layer of the photocurable resin is cured, and then the shaping table is moved to supply the second layer of photocurable resin on the first layer of the photocurable resin cured. The second layer of liquid photocurable resin is irradiated with light, the second layer of photocurable resin exposed to light is cured, and such an operation is repeated until the N layer to obtain a desired optically shaped product ( It is designed to form a three-dimensional structure.

However, the photofabricated object formed by such a photofabrication method is one in which a large number of photocurable resin layers are laminated, and the first photocurable resin layer to which light is irradiated first and then When the photocurable resin layer of the Nth layer (final layer) irradiated with light is compared, the irradiation history of light is significantly different between the first photocurable resin layer and the Nth photocurable resin layer. The light irradiation amount of the first photo-cured resin layer is larger than that of the N-th photo-cured resin layer. As a result, the optically shaped object formed by the optical shaping method is deformed according to the irradiation history of light.

FIG. 8 is a view showing an optical three-dimensional object 100 formed by the optical forming method, and is a view of the optical three-dimensional object 100 in which deformation is exaggerated. 8 (a) is a plan view of the optically shaped article 100, FIG. 8 (b) is a front view of the optically shaped article 100, and FIG. 8 (c) is a side view of the optically shaped article 100.

As shown in FIG. 8, the photofabricated object 100 formed by the photofabrication method is a light of the first layer first irradiated with light from the photocurable resin layer 101 an of the Nth layer finally irradiated with light. The amount of contraction increases toward the curable resin layer 101a1, and the appearance shape is not only deformed, but the position of the convex portion 102 is the lower surface 103 (the lower surface 103 of the Nth photocurable resin layer 101an) And the upper surface 104 (the upper surface 104 of the first layer of the photocurable resin layer 101a1), and a shift from the Nth layer of the photocurable resin layer 101an to the first layer of the photocurable resin layer 101a1 The convex part 102 approaches the center (origin of xy plane) o of the optical modeling thing 100 as it goes to a direction. In addition, the optical three-dimensional object 100 formed by the optical forming method is a convex designed as a perfect circle when the amount of contraction is different between the longitudinal direction (X direction in the xy plane) and the lateral direction (Y direction in the xy plane) The part 102 is deformed into an elliptical shape.

As described above, the photofabricated object 100 formed by the photofabrication method has a defect that the shrinkage difference is caused by the irradiation history of the light of each of the photocurable resin layers 101a1 to 101an, and the shape accuracy is deteriorated due to the shrinkage difference. doing. Then, in order to eliminate such a defect of the stereolithography method, the stimulation force (intensity of illumination) with respect to each photocurable resin layer 101a1-101an and the prestimulation waiting time (n-th layer photocurable resin layer 101an) Parameters such as the time between formation and the time between formation of the n-1 th layer of the photocurable resin layer 101a (n-1) are selected for each of the photocurable resin layers 101a A technique (photofabrication method) has been developed to minimize the difference in shrinkage between the photocurable resin layers 101a1 to 101an (see Patent Document 1).

JP 2012-71602 A

However, in the conventional photofabrication method, parameters such as stimulation power and pre-stimulation waiting time are selected for each of the photocurable resin layers 101a1 to 101an, and the photocuring conditions are changed for each of the photocurable resin layers 101a1 to 101an. As a result, it is difficult to control the operation of the layered manufacturing apparatus (for example, a 3D printer).

Therefore, the present invention aims to provide a layered manufacturing method capable of facilitating operation control of the layered manufacturing apparatus and capable of easily creating a three-dimensional structure with high accuracy.

The present invention relates to an additive manufacturing method of manufacturing a three-dimensional structure 6 by stacking resin layers cured by light irradiation. In the layered manufacturing method according to the present invention, the first step of creating the correction value creation model 6A under the same conditions as the actual production conditions of the three-dimensional structure 6, and the correction value creation created in the first step Second step of calculating the actual rate of change of the resin material from the model 6A for the model, and the actual rate of change of the three-dimensional structure 6 so that the three-dimensional structure 6 has the shape as designed after contraction. A third step of calculating a correction value, a fourth step of generating the correction 3D data 7A by the correction value, and a fifth step of operating the layered modeling apparatus 5 by the correction 3D data 7A Have.

According to the layered manufacturing method according to the present invention, it is possible to create 3D data for correction with the correction value calculated from the model for generating the correction value, and to operate the layered manufacturing apparatus with the 3D data for correction. Operation control can be facilitated, and high-precision three-dimensional structures can be easily created.

It is a figure for demonstrating the hardening process of the optical shaping method (lamination modeling method) which concerns on embodiment of this invention. It is a figure which shows the three-dimensional structure formed by the stereolithography method (lamination molding method) which concerns on embodiment of this invention, FIG. 2 (a) is a top view of a three-dimensional structure, FIG.2 (b) is a third order FIG. 2C is a side view of a three-dimensional structure. FIG. 3A is a plan view of the three-dimensional structure, and FIG. 3B is a three-dimensional view, comparing the design shape of the three-dimensional structure and the shape after photofabrication of the three-dimensional structure. FIG. 3 (c) is a side view of a three-dimensional structure, and FIG. 3 (d) is a back view of the three-dimensional structure. It is a figure for calculating | requiring the correction value of the convex part position and convex part shape of a three-dimensional structure. It is a figure for calculating | requiring the correction value of the corner part in the lower surface of the model for correction modeling. It is a figure for calculating | requiring the correction value of the corner part in the upper surface of the model for correction modeling. It is a process drawing for performing the optical modeling method concerning the embodiment of the present invention, and is a process drawing which arranges and shows a 1st process to a 5th process in time series. It is a figure which exaggerates and shows modification of the optical modeling thing formed by the stereolithography method, FIG. 8 (a) is a top view of an optical modeling thing, FIG.8 (b) is a front view of an optical modeling thing, FIG. 8 (c) is a side view of the photofabricated object.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, the photo-forming method of the layer-by-layer forming method will be described.

(Curing process)
FIG. 1 is a view showing a curing process of the optical forming method according to the embodiment of the present invention. As shown in FIG. 1, in the optical forming method according to the present embodiment, a liquid photocurable resin 2 (for example, an epoxy resin and an acrylate resin) is placed in a container 1 and the inside of the container 1 is moved up and down The liquid photocurable resin layer 2 for one layer is positioned below the support 4 of the table 3 (FIG. 1 (a)). In FIG. 1, the 3D printer (laminated modeling apparatus) 5 used for the stereolithography method is input when the 3D data 7 corresponding to the stereolithography object (three-dimensional structure) 6 is input to the controller 8. The processed 3D data 7 is processed by operation control software in the controller 8, and a control signal is output from the controller 8 to the first stepping motor 10 for raising and lowering the modeling table 3, and the controller 8 emits light. 11. A control signal is output to the second stepping motor 13 serving as a drive unit of the movement guide means 12 of 11, and control for controlling the irradiation of light 14 (for example, laser light) from the controller 8 to the light irradiation means 11. A signal is output.

Next, in the optical shaping method according to the present embodiment, the liquid photocurable resin 2 located under the support 4 of the shaping table 3 is irradiated with the light 14 from the light irradiating means 11, and the light 14 strikes it. The light curable resin layer 2a1 is cured by a minute (FIG. 1 (b)).

Next, in the optical shaping method according to the present embodiment, the shaping table 3 is raised, and the second layer of liquid photocurable resin 2 is supplied under the cured first layer of photocurable resin layer 2a1. The second liquid photocurable resin 2 is irradiated with light 14 to cure the second photocurable resin layer 2a2 which the light 14 has hit (FIG. 1 (c)).

Then, the photofabrication method according to the present embodiment repeatedly performs the above-described work, and supplies a new liquid photocurable resin layer 2 under the cured photocurable resin layer 2a (n-1). The liquid photo-curable resin 2 is irradiated with light 14 to cure the liquid photo-curable resin 2 and a plurality of layers (N layers) of photo-curable resin layers 2 an are stacked to form a three-dimensional light The figure 6 is to be formed (Fig. 1 (d)).

In the curing step of the photofabrication method according to the present embodiment as described above, the irradiation range (the range to be photocured) of the light 14 to the liquid photocurable resin 2 is determined based on the correction 3D data 7A described later .

After the curing step is completed, the modeling table 3 is lifted, and the photofabricated object 6 is taken out of the container. Next, the support 4 and the optical model 6 are removed from the modeling table 3. Then, the support 4 and the optical model 6 are separated.

(Three-dimensional structure)
FIG. 2 is a view showing an optical three-dimensional object (three-dimensional structure) 6 formed by the optical forming method according to the embodiment of the present invention. 2 (a) is a plan view of the optically shaped article 6, FIG. 2 (b) is a front view of the optically shaped article 6, and FIG. 2 (c) is a side view of the optically shaped article 6.

As shown in FIG. 2, the optical three-dimensional object 6 formed by the optical forming method according to the embodiment of the present invention is a rectangular parallelepiped having a convex portion 20 in a plan view, and each surface of the front and back A plurality of convex portions 20 having the same shape are formed on the side. In this photofabricated object 6, there is no difference in shrinkage from the first photo-curable resin layer 2a1 to the N-th photo-curable resin layer 2an, and the back surface (lower surface) 21 and the four side surfaces 22a to 22d are perpendicular. The surface (upper surface) 23 and the four side surfaces 22a to 22d are perpendicular to each other. Further, the shape of the photofabricated object 6 in plan view of the convex portion 20 is a perfect circle, and the position of the convex portion 20 in the first photocurable resin layer 2a1 and the position of the Nth photocurable resin layer 2an There is no difference in the position of the convex portion 20, and the central axis 20a of the convex portion 20 is formed to be orthogonal to the back surface (lower surface) 21 and the surface (upper surface) 23.

(Creating 3D data for correction)
In the photofabricated product 6 produced by the photofabrication method, the irradiation history of light is different for each of the stacked photocurable resin layers 2a1 to 2an, and the amount of change (hereinafter referred to as shrinkage amount) for each of the photocurable resin layers 2a1 to 2an Is different). That is, the amount of shrinkage of the photofabricated product 6 decreases from the Nth photocurable resin layer 2an having a small light irradiation amount toward the first photocurable resin layer 2a1 having a large light irradiation amount. Gradually increase (see Figure 3). As a result, when 3D data (3D data using uncorrected design values) corresponding to the photofabricated object 6 shown in FIG. It becomes impossible to produce the optical modeling thing 6 shown in FIG. 2 correctly (refer FIG. 3).

FIG. 3 shows the design shape (the shape shown by a two-dot chain line, which is abbreviated as a light build object (before contraction)) of the photofabricated object 6 and the shape after photofabrication of the photofabricated object 6 (a shape shown by solid lines) Fig. 6 is a view showing a photofabricated object (after contraction) in a comparison manner. 3 (a) is a plan view of the optically shaped article 6, FIG. 3 (b) is a front view of the optically shaped article 6, and FIG. 3 (c) is a side view of the optically shaped article 6. FIG. 3D is a back view of the photofabricated object 6. Further, in FIG. 3, the shape of the photofabricated object (after contraction) 6 is described by exaggerating the amount of shrinkage in order to clarify the difference from the photofabricated object (before contraction) 6.

As shown in FIG. 3, the three-dimensional object 6 is a rectangular parallelepiped rectangular hexahedron having a convex portion 20 in a plan view. In FIG. 3, the dimension of the photofabricated object (before contraction) 6 is set to X0 in the longitudinal direction and to Y0 in the latitudinal direction. In the photofabricated product (after shrinkage) 6, the dimension in the longitudinal direction of the back surface (bottom surface) 21 of the Nth photocurable resin layer 2an is X1, and the Nth photocurable resin layer 2an is The dimension in the short side direction of the back surface (lower surface) 21 is Y1. Moreover, the dimension of the longitudinal direction in the surface (upper surface) 23 of 1st-layer photocurable resin layer 2a1 is set to X2, and the photofabricated thing (after shrinkage) 6 is the 1st-layer photocurable resin layer 2a1. The dimension in the short side direction of the surface (upper surface) 23 is Y2. In addition, as shown in FIG. 3, the plurality of convex portions 20 are formed at the same position on the front and back, and the center position (center position of the center (surface of the upper surface) 23 of the rectangular shape in plan view ) Is set as the origin (o) of the xy plane, and the center position (center position) of the back surface (lower surface) 21 of the rectangular shape in plan view is set as the origin (o) of the xy plane. Then, the photofabricated object (after contraction) 6 is positioned on the back surface (lower surface) 21 of the Nth light curable resin layer 2an according to the amount of contraction of the Nth light curable resin layer 2an. The center of the convex portion 20 is offset from the center of the convex portion 20 of the optical three-dimensional object (before contraction). In addition, in the photofabricated product 6 (before shrinkage), in the photocurable resin layer 2an of the Nth layer, the shape of the convex portion 20 is the amount of shrinkage of the photocurable resin layer 2an of the Nth layer in the x direction and y It changes from a perfect circle of the design shape to an ellipse by the difference in the amount of contraction in the direction. In addition, the photofabricated product (after contraction) 6 is positioned on the surface (upper surface) 23 of the first layer of photocurable resin layer 2a1 according to the amount of contraction of the first layer of photocurable resin layer 2a1. The center of the convex portion 20 is offset from the center of the convex portion 20 of the photofabricated object (before shrinkage) 6, and the shift amount of the center of the convex portion 20 is the back surface of the Nth layer of the photocurable resin layer 2an The displacement amount of the center of the convex portion 20 located on the lower surface 21 is larger than the displacement amount of the center. In addition, the optically shaped article (after shrinkage) 6 has the shape of the convex portion 20 of the first layer of the photocurable resin layer 2a1 on the surface (upper surface) 23 of the first layer of the photocurable resin layer 2a1. The difference between the amount of contraction in the direction and the amount of contraction in the y direction causes the optical molded object (before contraction) 6 to be deformed from a true circle to an ellipse, and the amount of deformation of the convex portion 20 of the Nth photocurable resin layer 2an The deformation amount of the convex portion 20 on the back surface (lower surface) 21 is larger. In the description of the optical forming method (laminate forming method) according to the present embodiment, the shape of the convex portion 20 is expressed as a circle, unless the shape of the convex portion 20 is specifically identified as a true circle or an ellipse. Includes both true circles and ellipses.

As described above with reference to FIG. 3, since the optical three-dimensional object after optical shaping (after contraction) contracts in accordance with the irradiation history of light, the optical three-dimensional object without correction (before contraction) 6 On the other hand, there is a displacement of the shape. Therefore, in the optical shaping method according to the present embodiment, the optical shaped object 6 after optical shaping is designed by creating the optical shaped object 6 using the correction 3D data 7A generated as follows. It was made to become a shape (it was made to be able to create the high-precision photofabricated object 6 shown in FIG. 2).

(1) Create a correction value creation model 6A (first step).
The 3D printer 5 is operated by the CAD data 7 based on the design values, and a correction value creation model (photofabricated object) 6A is created through the curing process by the photofabrication method (multilayer fabrication method) (hatching in FIG. Create a shaped object (after contraction) 6).

(2) The actual change rate of the lower surface 21 of the correction value creation model 6A is calculated (second step).
Measure the dimension X1 in the longitudinal direction and the dimension Y1 in the lateral direction of the lower surface 21 (back surface (lower surface) 21 of the Nth layer of the photocurable resin layer 2an) of the correction value creation model 6A, and measure these values (X1 , Y1) and the design values (X0, Y0), the actual change rates (α1, β1) of the correction value creation model 6A are calculated by Equation 1.

(3) The correction value of the center position of the convex portion 20 and the correction value of the shape of the convex portion 20 on the lower surface 21 of the correction value creation model 6A are calculated (third step).
The center position (center position) of the plane shape on the lower surface 21 of the correction value creation model 6A is set as the origin o of the xy plane of the orthogonal coordinate system, and the convex portion of the optically shaped object (after contraction) 6 after the curing step is completed. Correction value of the center position of the convex part 20 (the corrected X coordinate value S, after correction) in which the shrinkage amount of the photofabricated object 6 after the curing process is finished so that the center position of 20 matches the design value The Y coordinate value T) of is calculated by Equation 2 using the actual change rates (.alpha.1, .beta.1). In Equation 2, the x coordinate value on the design of the center of the convex portion 20 is s, and the y coordinate value on the design of the center of the convex portion 20 is t.

Moreover, of the optically shaped article (after contraction) 6 after the completion of the curing process so that the radius of the convex portion 20 of the optically shaped article (after contraction) 6 after the completion of the curing process becomes the design value (r) The shape of the opening edge of the convex portion 20 in consideration of the amount of contraction is obtained by Expression 3. FIG. 4 is a diagram for helping to understand Equation 3, and illustrates a convex portion 20 of the X coordinate value S after correction from the origin o and the Y coordinate value T after correction from the origin o. Further, in FIG. 4, x ′ is a straight line passing through the center of the convex portion 20 and a straight line parallel to the x-axis. Further, in FIG. 4, y ′ is a straight line passing through the center of the convex portion 20 and a straight line parallel to the y axis.

Such calculation of the correction value of the center position of the convex portion 20 and the correction value of the shape of the convex portion 20 is performed for each convex portion 20.

(4) The correction value of the contour shape of the lower surface 21 of the correction value creation model 6A is calculated (third step).
In the lower surface 21 of the lower surface 21 in which the amount of shrinkage of the optically shaped article (after contraction) after completion of the curing process is estimated so that the contour of the optically shaped article (after contraction) 6 after the completion of the curing step matches the design dimensions. The contour dimension (correction value of contour shape) is calculated by Equation 4. FIG. 5 is a diagram for helping to understand Equation 4. The design value of the corner portion 24a in the lower surface 21 of the light figure (designed before shrinkage) 6 of the design shape is (X0, Y0), and the correction value is The correction value of the corner portion 24a in the lower surface 21 of the corrected modeling model 6B reflected is set to (X3, Y3).

The correction values of the four corner portions 24a to 24d in the lower surface 21 of the model for correction modeling 6B are the other 3 by obtaining the correction value of one corner portion 24a because the shape of the lower surface 21 is rectangular. The correction values of the corner portions 24b to 24d of the portion can be easily obtained.

(5) The actual change rate of the upper surface 23 of the correction value creation model 6A is calculated (second step).
Measure the dimension X2 in the longitudinal direction and the dimension Y2 in the lateral direction of the upper surface 23 of the model 6A for creating a correction value, and use these actually measured values (X2, Y2) and design values (X0, Y0) to obtain a correction value. The actual change rates (α 2, β 2) of the production model 6 A are calculated by equation 5.

(6) The correction value of the center position of the convex portion 20 and the correction value of the shape of the convex portion 20 on the upper surface 23 of the correction value creation model 6A are calculated (third step).
The center position (center position) of the plane shape on the upper surface 23 of the correction value creation model 6A is set as the origin o of the xy plane of the orthogonal coordinate system, and the convex portion of the optically modeled object (after contraction) 6 after the curing step is completed Correction value of the center position of the convex part 20 (the corrected X coordinate value S, after correction) in which the shrinkage amount of the photofabricated object 6 after the curing process is finished so that the center position of 20 matches the design value The Y coordinate value T) of is calculated by Equation 6 using the actual change rates (.alpha.2, .beta.2). In Equation 6, the x coordinate value on the design of the center of the convex portion 20 is s, and the y coordinate value on the design of the center of the convex portion 20 is t.

Moreover, of the optically shaped article (after contraction) 6 after the completion of the curing process so that the radius of the convex portion 20 of the optically shaped article (after contraction) 6 after the completion of the curing process becomes the design value (r) The shape of the convex portion 20 in consideration of the amount of contraction is obtained by Formula 7. FIG. 4 is a diagram for helping to understand Equation 7, and illustrates a convex portion 20 of the X coordinate value S after correction from the origin o and the Y coordinate value T after correction from the origin o. Further, in FIG. 4, x ′ is a straight line passing through the center of the convex portion 20 and a straight line parallel to the x-axis. Further, in FIG. 4, y ′ is a straight line passing through the center of the convex portion 20 and a straight line parallel to the y axis.

(7) A correction value of the contour shape of the upper surface 23 of the correction value creation model 6A is calculated (third step).
In the upper surface 23 of the upper surface 23 in which the amount of contraction of the photofabricated object (after shrinkage) 6 after completion of the curing process is estimated so that the contour of the photofabricated object (after shrinkage) 6 after completion of the curing process matches the design dimensions. The outline dimension (correction value of the outline shape) is calculated by equation 8. Note that FIG. 6 is a diagram for helping understanding of the equation 8, and the design value of the corner portion 25a on the upper surface 23 of the light figure (designed before contraction) 6 of the design shape is (X0, Y0), and the correction value is The correction value of the corner portion 25a on the upper surface 23 of the corrected modeling model 6B reflected is set to (X4, Y4).

The correction values of the four corner portions 25a to 25d on the upper surface 23 of the model for correction modeling 6B are the other 3 by obtaining the correction value of the corner portion 25a at one place because the shape of the upper surface 23 is rectangular. The correction values of the corner portions 25b to 25d of the portion can be easily obtained.

(8) The correction 3D data 7A for controlling the operation of the 3D printer 5 is created (fourth step).
The correction value obtained as described above is input to 3D CAD software (for example, ANSYS), the design value previously input in the 3D CAD software is replaced with the correction value, and the 3D CAD software generates 3D data 7A for hexahedron correction. Do. That is, the hexahedron has a shape in which the contour (four sides) of the lower surface 21 reflecting the correction value and the contour (four sides) of the upper surface 23 reflecting the correction value are joined by planes 27a to 27d by a function of blending of 3D CAD software. It has become.

(9) The 3D printer is operated with the correction 3D data 7A (fifth step).
The correction 3D data 7A is used as operation control data of the 3D printer 5. In the curing step shown in FIG. 1, the irradiation range of the light 14 for each of the photocurable resin layers 2a1 to 2an is determined. Then, the photofabricated object 6 that has been photofabricated (shrunk through the curing process) using such correction 3D data 7A has a shape with high accuracy as shown in FIG.

FIG. 7 is a process diagram for carrying out the optical forming method according to the present embodiment, and is a process diagram showing the first to fifth steps in time series.

As described above, according to the optical forming method according to the present embodiment, the correction 3D data 7A is generated by the correction value calculated from the correction value generation model 6A, and the 3D printer 5 is operated by the correction 3D data 7A. Therefore, the operation control of the 3D printer 5 can be facilitated, and the high-precision photofabricated object 6 can be easily created.

Further, according to the optical forming method according to the present embodiment, when the optical formed object 6 has the convex portion 20 having a circular shape in plan view, the shape of the convex portion 20 is obtained from the correction value generation model 6A By correcting the calculated correction value and including the correction value of the shape of the convex portion 20 in the correction 3D data 7A, it is possible to easily create the photofabricated object 6 including the convex portion 20 with high accuracy.

The layered manufacturing method according to the present invention is not limited to the shape of the optical shaped article according to the above embodiment, and for example, a shape having a recess rather than a convex portion, a shape having a hole penetrating from the upper surface to the lower surface, and the hole It can apply also to the shape which has two or more. Further, the shape of the hole is not particularly limited, and may be a perfect circle, an ellipse, or a polygon such as a triangle or a square.

The lamination molding method according to the present invention is not limited to the optical molding method according to the above embodiment, and a plurality of resin layers are formed by sintering powdery resin layers with laser light of the lamination molding device and stacking them. It is applicable also to the powder sintering method which creates a three-dimensional structure.

5 ...... 3D printer (laminated molding apparatus), 6 ...... photofabricated object (three-dimensional structure), 6 A ...... model for creating correction values, 7 A ...... 3D data for correction

Claims

In the additive manufacturing method of stacking resin layers cured by light irradiation to produce a three-dimensional structure,
A first step of creating a correction value generation model under the same conditions as actual three-dimensional structure manufacturing conditions;
A second step of calculating an actual change rate of the correction value creating model created in the first step;
A third step of calculating a correction value of the three-dimensional structure from an actual change rate so that the three-dimensional structure has a shape as designed after contraction;
A fourth step of creating correction 3D data using the correction value;
A fifth step of operating the layered manufacturing apparatus with the correction 3D data;
The additive manufacturing method characterized by having.
The three-dimensional structure has a convex portion having a circular shape in plan view,
The correction value of the convex portion shape is calculated using the change rate calculated in the second step so that the circular convex portion has a shape as designed after contraction of the three-dimensional structure.
The correction 3D data includes a correction value of the convex shape.
Additive manufacturing method characterized by