JP7166102B2 - Modeling data creation device, program for modeling data creation device, modeling data creation method, and modeling method - Google Patents

Description

The present embodiment relates to a modeling data creation device, a modeling data creation device program, a modeling data creation method, and a modeling method for modeling a structure by metal three-dimensional additive manufacturing.

Metal powders and metal wires are used as raw materials for metal three-dimensional additive manufacturing. Raw materials such as these metal powders and wires are selectively melted and solidified by heat generated by electron beams and laser beams to form structures. During melting and solidification, thermal strain, transformation strain, metal flow, and the like occur, so the model deforms. Analyzing devices are known that analyze deformation caused by layered manufacturing.

JP 2017-161981 A

Three-dimensional additive manufacturing has advantages such as enabling near-net manufacturing, which has been difficult with conventional manufacturing processes, reducing manufacturing costs, and improving product functions.

The entire structure is shaped by a melting and solidification process of raw materials for three-dimensional additive manufacturing.

If the structure has a complex shape, deformation will occur throughout the structure. Deformation of a structure deteriorates modeling quality such as dimensional accuracy.

Conventionally, in order to reduce the deformation caused by 3D additive manufacturing, a method to suppress deformation by attaching a strong support to the structure to be manufactured, predicting the deformation and adjusting the structure to be manufactured according to the predicted amount Means for making corrections, etc. are used.

However, these means have the problem that the deformation of the structure in the three-dimensional layered manufacturing cannot be reduced efficiently and accurately. When a strong support is attached, post-processing such as the support removal process and surface polishing process becomes complicated, and when predicting deformation, there is no method to accurately reflect the prediction result in the modeling data. I had a problem.

An object of the present embodiment is to provide a modeling data creation device, a modeling data creation device program, a modeling data creation method, and a modeling method that anticipate deformation of a structure to be manufactured in three-dimensional additive manufacturing.

The modeling data creation apparatus of this embodiment is characterized by having the following configuration.
(1) A finite element construction section that receives structure shape data relating to the shape of a structure to be manufactured by additive manufacturing, divides the input structure shape data into finite elements, and creates first element data.
(2) A reverse displacement imparting unit that creates second element data by imparting, to the first element data created by the finite element construction unit, an inverse displacement of the displacement that occurs during modeling.
(3) A surface information output unit that outputs third element data, which is information about the surface of the structure, among the second element data created by the inverse displacement imparting unit.

A program for a modeling data creation device, a modeling data creation method, and a modeling method having features corresponding to the above are also aspects of the present embodiment.

Block diagram showing the modeling data creation device according to the first embodiment A diagram showing the flow of the program for the modeling data creation device according to the first embodiment. FIG. 4 is a diagram for explaining a process of creating modeling data according to the first embodiment;

[1. First Embodiment]
[1-1. Constitution]
A modeling data creation device 1 will be described as an example of the present embodiment with reference to FIG. The modeling data creation device 1 is a device configured by a computer or the like. The modeling data creation apparatus 1 is installed in a factory or the like where a manufacturing line for manufacturing a structure to be manufactured is arranged.

(Overall Configuration of Modeling Data Creation Device 1)
The modeling data creation device 1 has an input unit 2 , a finite element construction unit 3 , a reverse displacement imparting unit 4 , and a surface information output unit 5 . Each section of the modeling data creation apparatus 1 is configured by a computing section in a computer or a software module. Also, each part of the modeling data creation apparatus 1 may be implemented by an individual microcomputer, microcomputer chip, or hardware.

The modeling data creation apparatus 1 receives input of structure shape data relating to the shape of a structure to be manufactured, divides the input structure shape data into finite elements in a finite element construction unit 3, and generates first element data. create. In addition, the modeling data creation device 1 gives the first element data created by the finite element constructing unit 3 a reverse displacement of the displacement that occurs during modeling, and creates the second element data by the reverse displacement giving unit 4. . The modeling data creation device 1 outputs the third element data, which is information about the surface of the structure, among the second element data created by the inverse displacement imparting unit 4 , through the surface information output unit 5 .

(Input section 2)
The input unit 2 is composed of a communication interface with a communication line such as the Internet or an intranet, an external memory interface such as a USB memory or hard disk, or a man-machine interface such as a keyboard, mouse, or touch panel. The input unit 2 receives structure shape data relating to the shape of a structure to be manufactured by layered manufacturing.

The structure shape data regarding the shape of the structure is input by a communication telegram, data stored in an external memory, or operation of a man-machine interface by an operator. Input unit 2 is connected to finite element construction unit 3 . The input unit 2 outputs the structure shape data to the finite element construction unit 3 .

(Finite element construction part 3)
The finite element constructing section 3 is composed of a surface element constructing section 31 , a voxel element constructing section 32 and an element superimposing section 33 . The surface element constructing section 31, the voxel element constructing section 32, and the element superimposing section 33 of the finite element constructing section 3 are configured by a computing section in a computer or a software module. Also, the surface element construction unit 31, the voxel element construction unit 32, and the element superposition unit 33 of the finite element construction unit 3 may be realized by individual microcomputers, microcomputer chips, or hardware.

The finite element constructing unit 3 receives input of structure shape data relating to the shape of a structure to be manufactured, divides the input structure shape data into finite elements to create first element data, and applies an inverse displacement applying unit. Output to 4.

The surface element constructing section 31 is connected to the input section 2 on the input side and to the element superposing section 33 on the output side. The surface element construction unit 31 receives the structure shape data from the input unit 2, divides the surface shape of the structure to be manufactured into finite elements, and creates surface elements. The surface element constructing unit 31 constructs surface elements based on the outer surface data of the input structure shape data. Preferably, the surface elements are composed of four-node quadrangular elements. The surface elements are not limited to those composed of four-node quadrilateral elements. The created surface elements are output to the element overlapping section 33 .

The voxel element constructing section 32 is connected to the input section 2 on the input side and to the element combining section 33 on the output side. The voxel element construction unit 32 receives the structure shape data from the input unit 2, divides the entire three-dimensional shape of the structure to be manufactured into voxel-type finite elements, and creates voxel elements. The voxel element constructing unit 32 constructs voxel elements based on the three-dimensional data of the input structure shape data.

Voxel elements are also created in parts containing surface parts of the structure to be manufactured. The voxel elements are preferably composed of 8-node hexahedral elements. The voxel elements are not limited to those composed of 8-node hexahedral elements. The created voxel elements are output to the element overlapping section 33 .

The element overlapping section 33 is connected to the surface element constructing section 31 and the voxel element constructing section 32 on the input side, and to the reverse displacement imparting section 4 on the output side. The element superimposing unit 33 superimposes the surface elements created by the surface element constructing unit 31 and the voxel elements created by the voxel element constructing unit 32 to create superimposed elements. A superimposed element is created by connecting a node of the surface element and an edge or a node of the voxel element in the voxel element including the surface element. The created superimposed element is used as first element data. The first element data is output to the inverse displacement imparting section 4 .

(Reverse displacement imparting unit 4)
The reverse displacement imparting unit 4 is composed of an inherent strain data storage unit 41 , an inherent strain data conversion unit 42 and an inherent strain method analysis unit 43 . The inherent strain data conversion unit 42 and the inherent strain method analysis unit 43 of the inverse displacement imparting unit 4 are configured by an arithmetic unit in a computer or a software module. Further, the inherent strain data conversion unit 42 and the inherent strain method analysis unit 43 of the inverse displacement imparting unit 4 may be realized by separate microcomputers, microcomputer chips, or hardware.

The reverse displacement applying unit 4 gives the input first element data created by the finite element constructing unit 3 a reverse displacement of the displacement that occurs during modeling, creates second element data, and the surface information output unit 5 . output to

The inherent strain data storage unit 41 is composed of a storage medium such as a semiconductor memory or a hard disk. The inherent strain data storage unit 41 is connected to the inherent strain data conversion unit 42 . The inherent strain data storage unit 41 stores inherent strain data, which is data relating to the strain of the structure to be manufactured. The inherent strain data is data containing inherent strain values relating to the strain of the structure to be manufactured. The stored inherent strain data is output to the inherent strain data conversion section 42 .

The intrinsic strain value is calculated from modeling conditions, material physical property values, and the like. Alternatively, the inherent strain value is calculated by thermal elastic-plastic analysis. The modeling conditions used for calculating the inherent strain value are, for example, the output of the heat source, the type of heat source, the beam profile, the scanning speed, the scanning sequence, the line offset, the preheating conditions, and the like.

The physical property values of the material used for calculating the inherent strain value are, for example, mechanical property values of the material such as Young's modulus, proof stress and coefficient of linear expansion, and thermophysical property values such as thermal conductivity and specific heat. The inherent strain data is input from the input section 2 . Alternatively, the inherent strain data may be input via communication from an external inherent strain database or the like.

The inherent strain data conversion unit 42 is connected to the inherent strain data storage unit 41 on the input side and to the inherent strain method analysis unit 43 on the output side. The inherent strain data conversion unit 42 receives the inherent strain data from the inherent strain data storage unit 41, and based on the inherent strain data, which is data relating to the strain of the structure, creates an inherent strain matrix that is the inverse of the displacement that occurs during modeling. do.

For example, the inherent strain data conversion unit 42 multiplies the matrix component of the inherent strain values received from the inherent strain data storage unit 41 by a minus to create an inherent strain matrix. The created inherent strain matrix is output to the inherent strain method analysis unit 43 .

The inherent strain method analysis unit 43 is connected to the inherent strain data conversion unit 42 on the input side and to the surface information output unit 5 on the output side. The inherent strain method analysis unit 43 performs the inherent strain method analysis based on the first element data created by the finite element constructing unit 3 and the inherent strain matrix created by the inherent strain data conversion unit 42 to obtain second element data. to create

The inherent strain method analysis unit 43 receives the first element data constructed by the finite element method analysis model from the element superposition unit 33 of the finite element constructing unit 3 and the inherent strain matrix from the inherent strain data conversion unit 42, Deformation analysis and stress analysis are performed using the strain method.

The intrinsic strain method obtains the nodal displacement and residual stress when the intrinsic strain is applied to the voxel element through calculation of the nodal load and stiffness matrix. The intrinsic strain method analysis unit 43 can also switch the active state of the element. The inherent strain method analysis unit 43 treats the unfabricated part as an inactive element and the region through which the heat source passes as an active element, inputs the inherent strain based on the inherent strain matrix, and performs an analysis that reproduces the actual additive manufacturing process. will be The second element data created by the inherent strain method analysis is output to the surface information output section 5 .

(Surface information output unit 5)
The surface information output unit 5 is composed of a communication interface with a communication line such as the Internet or an intranet, an external memory interface such as a USB memory or a hard disk, a display device, and a printer. The input side of the surface information output unit 5 is connected to the inherent strain analysis unit 43 of the inverse displacement imparting unit 4 . The surface information output unit 5 outputs third element data, which is information about the surface of the structure to be manufactured, among the second element data created by the inverse displacement imparting unit 4 .

The third element data, which is information about the surface of the structure to be manufactured, includes communication telegrams compatible with communication lines such as the Internet and intranets, electronic data in a format compatible with external memories such as USB memories and hard disks, and display , is output by printing. The surface information output unit 5 outputs the third element data, which is information about the surface of the structure to be manufactured, in a format that can be used in the procedure for modeling the structure by layered manufacturing.

The above is the configuration of the modeling data creation apparatus 1 . Based on the third element data output from the surface information output unit 5, the operator models a structure by layered manufacturing.

[1-2. action]
Next, based on FIGS. 1 to 3, the outline of the operation of the modeling data creation device 1 of this embodiment will be described. A structure to be manufactured is shaped by the procedure shown in FIG. FIG. 2 shows the flow of the program for the modeling data creation device 1, the procedure for the modeling data creation method, and the procedure for the modeling method.

The modeling data creation device 1 divides the input structure shape data relating to the shape of the structure to be manufactured into finite elements, and the finite element construction unit 3 creates the first element data. A reverse displacement of the displacement that occurs during modeling is given to the first element data created by Among the element data, the surface information output unit 5 outputs the third element data, which is information about the surface of the structure. Based on the third element data output by the surface information output procedure 5, a structure to be manufactured is modeled by layered manufacturing.

(Step S01: Structure shape data is input)
First, structure shape data is input to the input unit 2 of the modeling data creation device 1 . The structure shape data is input by the operator from a communication interface with a communication line such as the Internet or an intranet that constitutes the input unit 2, an external memory interface such as a USB memory or a hard disk, or a man-machine interface such as a keyboard, mouse, or touch panel. is entered.

The structure shape data regarding the shape of the structure is input by a communication telegram, data stored in an external memory, or operation of a man-machine interface by an operator. The structure shape data is data relating to the shape of a structure to be manufactured by lamination manufacturing. The structure shape data is constructed by stacking data as shown in FIG. 3(a). The structure shape data input to the input unit 2 are output to the surface element constructing unit 31 and the voxel element constructing unit 32 of the finite element constructing unit 3 .

(Step S02: Surface elements are created by the surface element constructing unit 31)
Next, the modeling data creation device 1 creates surface elements by the surface element construction section 31 of the finite element construction section 3 . The surface element construction unit 31 receives the structure shape data from the input unit 2, divides the surface shape of the structure to be manufactured into finite elements, and creates surface elements as shown in FIG. 3(b). The surface element constructing unit 31 constructs surface elements based on the outer surface data of the input structure shape data. Preferably, the surface elements are composed of four-node quadrangular elements. The surface elements created by the surface element constructing section 31 are output to the element overlapping section 33 .

(Step S03: Voxel elements are created by the voxel element constructing unit 32)
Next, the modeling data creation device 1 creates voxel elements by the voxel element construction section 32 of the finite element construction section 3 . The voxel element construction unit 32 receives the structure shape data from the input unit 2, divides the entire three-dimensional shape of the structure to be manufactured into voxel-type finite elements, and creates voxel elements as shown in FIG. 3(c). to create The voxel element constructing unit 32 constructs voxel elements based on the three-dimensional data of the input structure shape data.

Voxel elements are also created in parts containing surface parts of the structure to be manufactured. The voxel elements are preferably composed of 8-node hexahedral elements. The voxel elements created by the voxel element constructing section 32 are output to the element overlapping section 33 .

(Step S04: Create the first element data by the element overlapping unit 33)
Next, the modeling data creating apparatus 1 creates first element data by the element superimposing section 33 of the finite element constructing section 3 . The element overlapping section 33 overlaps the surface elements created by the surface element constructing section 31 and the voxel elements created by the voxel element constructing section 32 to create overlapping elements as shown in FIG. 3(d). A superimposed element is created by connecting a node of the surface element and an edge or a node of the voxel element in the voxel element including the surface element. The created superimposed element is used as first element data. The created first element data is output to the inherent strain analysis section 43 of the inverse displacement imparting section 4 .

(Step S05: The inherent strain matrix is created by the inherent strain data conversion unit 42)
Next, the modeling data creation device 1 creates an intrinsic strain matrix by the intrinsic strain data conversion unit 42 of the inverse displacement imparting unit 4 . The inherent strain data conversion unit 42 receives the inherent strain data from the inherent strain data storage unit 41, and based on the inherent strain data, which is data related to the strain of the structure, converts an inherent strain matrix that is the inverse displacement to the displacement that occurs during modeling. create.

The inherent strain data is stored in the inherent strain data storage unit 41 . The inherent strain data is data containing inherent strain values relating to the strain of the structure to be manufactured. The intrinsic strain value is calculated from modeling conditions, material physical property values, and the like. Alternatively, the inherent strain value is calculated by thermal elastic-plastic analysis. The modeling conditions used for calculating the inherent strain value are, for example, the output of the heat source, the type of heat source, the beam profile, the scanning speed, the scanning sequence, the line offset, the preheating conditions, and the like.

The physical property values of the material used for calculating the inherent strain value are, for example, mechanical property values of the material such as Young's modulus, proof stress and coefficient of linear expansion, and thermophysical property values such as thermal conductivity and specific heat. The inherent strain data is input from the input section 2 . Alternatively, the inherent strain data may be input via communication from an external inherent strain database or the like.

The inherent strain data conversion unit 42, for example, multiplies the matrix component of the inherent strain values received from the inherent strain data storage unit 41 by a negative value to create an inherent strain matrix. The inherent strain matrix created by the inherent strain data conversion unit 42 is output to the inherent strain method analysis unit 43 .

(Step S06: Create the second element data by the inherent strain method analysis unit 43)
Next, the modeling data creation apparatus 1 creates second element data by the inherent strain method analysis unit 43 of the inverse displacement imparting unit 4 . The inherent strain method analysis unit 43 performs the inherent strain method analysis based on the first element data created by the element superimposing unit 33 of the finite element constructing unit 3 and the inherent strain matrix created by the inherent strain data conversion unit 42. Create the second element data.

The inherent strain method analysis unit 43 receives the first element data constructed by the finite element method analysis model from the element superposition unit 33 of the finite element constructing unit 3 and the inherent strain matrix from the inherent strain data conversion unit 42, Deformation analysis and stress analysis are performed using the strain method.

In the inherent strain method, as shown in FIG. 3(e), nodal displacement and residual stress when inherent strain is applied to a voxel element are obtained through calculation of nodal loads and stiffness matrices. In the inherent strain method analysis unit 43, the active state of the element is switched. The inherent strain method analysis unit 43 treats the unfabricated part as an inactive element and the region through which the heat source passes as an active element, inputs the inherent strain based on the inherent strain matrix, and performs an analysis that reproduces the actual additive manufacturing process. will be The second element data created by the inherent strain method analysis unit 43 is output to the surface information output unit 5 .

(Step S07: output the third element data by the surface information output unit 5)
Next, the modeling data creation device 1 outputs third element data from the surface information output unit 5 . The surface information output unit 5 outputs third element data, which is information about the surface of the structure to be manufactured, among the second element data created by the inverse displacement imparting unit 4 .

The third element data, which is information about the surface of the structure to be manufactured, includes communication telegrams compatible with communication lines such as the Internet and intranets, electronic data in a format compatible with external memories such as USB memories and hard disks, and display , is output by printing. The surface information output unit 5 outputs the third element data, which is information about the surface of the structure to be manufactured, in a format that can be used in the procedure for modeling the structure by layered manufacturing.

Based on the third element data output by the surface information output procedure 5, the operator models the structure by layered manufacturing. The above is the procedure for modeling the structure to be manufactured. Also, the above is the flow of the program for the modeling data creation apparatus 1, the procedure relating to the modeling data creation method, and the procedure relating to the modeling method.

[1-3. effect]
(1) According to the present embodiment, the modeling data creation apparatus 1 for a laminate-manufactured object receives input of structure-shape data relating to the shape of a structure to be manufactured by laminate-molding, and converts the input structure-shape data into finite elements. A finite element constructing unit 3 that divides and creates first element data, and the first element data created by the finite element constructing unit 3 is given an inverse displacement of the displacement that occurs during modeling to create second element data. and a surface information output unit 5 for outputting third element data, which is information relating to the surface of the structure, among the second element data created by the reverse displacement imparting unit 4. Therefore, it is possible to provide a modeling data creation device, a modeling data creation device program, a modeling data creation method, and a modeling method that can reduce deformation of a structure to be manufactured in three-dimensional additive manufacturing.

According to the present embodiment, the inverse deformation of the predicted deformation amount can be reflected in the modeling shape data, and the deformation in the three-dimensional layered manufacturing of the structure to be manufactured can be reduced.

(2) According to the present embodiment, the finite element constructing unit 3 includes a surface element constructing unit 31 that divides the surface shape of the structure into finite elements based on input structure shape data to create surface elements, and an input A voxel element constructing unit 32 that divides the three-dimensional shape of the structure into voxel-type finite elements based on the obtained structure shape data to create voxel elements, and a surface element constructing unit 31 generates surface elements and voxel element construction. and an element superimposing unit 33 that superimposes the voxel elements created by the unit 32 to create a superimposed element and uses it as the first element data, so that the deformation of the structure to be manufactured in the three-dimensional layered manufacturing is reduced. It is possible to provide a modeling data creation device, a program for a modeling data creation device, a modeling data creation method, and a modeling method that can create a shape.

In the prior art, the overall deformation of a structure to be manufactured after molding is predicted by finite element method analysis in which 8-node hexahedral elements, which are voxel elements, are used as finite elements. Therefore, when the structure to be manufactured has a shape that does not match the voxel elements, the deformation cannot be analyzed with high accuracy. As a result, it has not been possible to accurately reduce the deformation of the structure to be manufactured in the three-dimensional additive manufacturing.

According to this embodiment, the surface element construction unit 31 divides the surface shape of the structure into finite elements to create surface elements, and the surface elements and voxel elements are superimposed by the element overlapping unit 33. Even if the structure to be manufactured has a shape that does not match the voxel elements, the structure to be manufactured can be reduced to finite elements by the surface elements. As a result, deformation can be analyzed with higher accuracy. As a result, it is possible to more accurately reduce the deformation of the structure to be manufactured in the three-dimensional additive manufacturing.

(3) According to this embodiment, the surface element constructing unit 31 constructs surface elements using four-node quadrilateral elements, and the voxel element constructing unit 32 constructs voxel elements using eight-node hexahedral elements. Model construction can be performed with higher accuracy, and deformation can be analyzed with higher accuracy. As a result, it is possible to more accurately reduce the deformation of the structure to be manufactured in the three-dimensional additive manufacturing.

(4) According to the present embodiment, the inverse displacement imparting unit 4 performs inherent strain data conversion that creates an inherent strain matrix that is an inverse displacement with respect to the displacement that occurs during modeling based on the inherent strain data that is data relating to the strain of the structure. section 42, and based on the first element data created by the finite element constructing section 3 and the inherent strain matrix created by the inherent strain data conversion section 42, an inherent strain method analysis is performed to create second element data. Since the strain method analysis unit 43 is provided, the deformation can be analyzed with higher accuracy. As a result, it is possible to more accurately reduce the deformation of the structure to be manufactured in the three-dimensional additive manufacturing.

[Other embodiments]
While embodiments including variations have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof. Below is an example.

(1) In the above embodiment, the voxel element construction unit 32 divides the three-dimensional shape of the structure to be manufactured into voxel-type finite elements to create voxel elements. The voxel elements to be created are desirably created by decomposing the entire three-dimensional shape of the structure to be manufactured into voxel-type finite elements of the same size. However, the voxel elements to be created are created by decomposing the area shared with the surface element into small voxel-shaped finite elements, and decomposing the area excluding the area shared with the surface element into large voxel-shaped finite elements. You may do so. By doing so, the data capacity of the voxel elements can be reduced.

REFERENCE SIGNS LIST 1 modeling data creation device 2 input unit 3 finite element construction unit 4 reverse displacement imparting unit 5 surface information output unit 31 surface element construction unit 32 Voxel element construction unit 33 Element superimposition unit 41 Intrinsic strain data storage unit 42 Intrinsic strain data conversion unit 43 Intrinsic strain method analysis unit

Claims (13)

a finite element construction unit that receives structure shape data relating to the shape of a structure to be manufactured by additive manufacturing, divides the input structure shape data into finite elements, and creates first element data;
a reverse displacement imparting unit that imparts, to the first element data generated by the finite element constructing unit, a reverse displacement of the displacement that occurs during modeling to generate second element data;
a surface information output unit that outputs third element data, which is information about the surface of the structure, among the second element data created by the inverse displacement imparting unit;
has
The finite element construction unit
a surface element constructing unit that divides the surface shape of the structure into finite elements based on the input structure shape data and creates surface elements;
a voxel element constructing unit that creates voxel elements by dividing the three-dimensional shape of the structure into voxel-type finite elements based on the input structure shape data;
an element overlapping unit that superimposes the surface elements created by the surface element constructing unit and the voxel elements created by the voxel element constructing unit to create a superimposed element and sets the superimposed element as the first element data;
A modeling data creation device for a laminate-molded article. The surface element constructing unit creates the surface elements with four-node quadrangular elements or three-node triangular elements,
The voxel element constructing unit creates the voxel element with an 8-node hexahedral element.
The modeling data creation device according to claim 1 . The reverse displacement imparting unit is
an inherent strain data conversion unit that creates an inherent strain matrix that is an inverse displacement with respect to the displacement that occurs during modeling based on inherent strain data that is data relating to the strain of the structure;
Based on the first element data created by the finite element construction unit and the inherent strain matrix created by the inherent strain data conversion unit, an inherent strain method analysis is performed to create the second element data. a legal analysis unit;
having
The modeling data creation device according to claim 1 or 2 . The reverse displacement imparting unit is
Having a displacement evaluation unit that experimentally obtains the displacement that occurs during modeling,
The modeling data creation device according to claim 1 or 2 . a finite element construction step of dividing input structure shape data relating to the shape of a structure to be manufactured by additive manufacturing into finite elements to create first element data;
a reverse displacement imparting step of giving the first element data generated by the finite element construction step a reverse displacement of the displacement generated during modeling to generate second element data;
a surface information output step of outputting third element data, which is information about the surface of the structure, among the second element data created in the inverse displacement step;
has
The finite element construction step includes:
Based on the input structure shape data, the surface shape of the structure is divided into finite elements and displayed.
a surface element construction step for creating surface elements;
a voxel element building step of dividing the three-dimensional shape of the structure into voxel-type finite elements based on the input structure shape data to create voxel elements;
an element superposition step of superimposing the surface element created by the surface element constructing step and the voxel element created by the voxel element constructing step to create a superimposed element, and using the superimposed element as the first element data;
A program for a modeling data creation device for a laminate-molded object having The surface element construction step creates the surface elements with four-node quadrangular elements or three-node triangular elements,
The voxel element building step creates the voxel elements with 8-node hexahedral elements.
A program for a modeling data creation device according to claim 5 . The inverse displacement step includes:
an inherent strain data conversion step of creating an inherent strain matrix that is an inverse displacement with respect to the displacement that occurs during modeling based on the inherent strain data that is data relating to the strain of the structure;
Based on the first element data created by the finite element construction step and the inherent strain matrix created by the inherent strain data conversion step, an inherent strain method analysis is performed to create the second element data. a modal analysis step;
having
A program for a modeling data creation device according to claim 5 or 6 . The inverse displacement step includes:
Having a displacement evaluation step of obtaining by experiment the displacement that occurs during modeling,
A program for a modeling data creation device according to claim 5 or 6 . a finite element construction procedure for dividing input structure shape data relating to the shape of a structure to be manufactured by additive manufacturing into finite elements to create first element data;
a reverse displacement imparting procedure for creating second element data by giving the first element data created by the finite element construction procedure a reverse displacement of the displacement that occurs during modeling;
a surface information output procedure for outputting third element data, which is information relating to the surface of the structure, among the second element data created by the inverse displacement procedure;
has
The finite element construction procedure comprises:
a surface element construction procedure for dividing the surface shape of the structure into finite elements based on the input structure shape data to create surface elements;
a voxel element construction procedure for creating voxel elements by dividing the three-dimensional shape of the structure into voxel-type finite elements based on the input structure shape data;
an element polymerization procedure for superimposing the surface elements created by the surface element construction procedure and the voxel elements created by the voxel element construction procedure to create a superimposed element as the first element data;
A method for creating modeling data for a laminate-molded article having The surface element construction procedure creates the surface elements with four-node quadrangular elements or three-node triangular elements,
The voxel element construction procedure creates the voxel element with an 8-node hexahedral element.
The modeling data creation method according to claim 9 . The inverse displacement procedure includes:
an inherent strain data conversion procedure for creating an inherent strain matrix that is an inverse displacement with respect to the displacement that occurs during modeling based on inherent strain data that is data relating to the strain of the structure;
Based on the first element data created by the finite element construction procedure and the inherent strain matrix created by the inherent strain data conversion procedure, an inherent strain analysis is performed to create the second element data. a forensic analysis procedure;
having
The modeling data creation method according to claim 9 or 10 . The inverse displacement procedure includes:
Having a displacement evaluation procedure for determining the displacement that occurs during modeling by experiment,
The modeling data creation method according to claim 9 or 10 . a finite element construction procedure for dividing input structure shape data relating to the shape of a structure to be manufactured by additive manufacturing into finite elements to create first element data;
a reverse displacement imparting procedure for creating second element data by giving the first element data created by the finite element construction procedure a reverse displacement of the displacement that occurs during modeling;
a surface information output procedure for outputting third element data, which is information relating to the surface of the structure, among the second element data created by the inverse displacement procedure;
a step of modeling the structure by layered manufacturing based on the third element data output by the surface information output step;
has
The finite element construction procedure comprises:
a surface element construction procedure for dividing the surface shape of the structure into finite elements based on the input structure shape data to create surface elements;
a voxel element construction procedure for creating voxel elements by dividing the three-dimensional shape of the structure into voxel-type finite elements based on the input structure shape data;
an element polymerization procedure for superimposing the surface element created by the surface element construction procedure and the voxel element created by the voxel element construction procedure to create a superimposed element and using the first element data;
A method for forming a laminate-molded article having

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