JP2017211977A - Data creation device, three-dimensional lamination system, design method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data creation device, a control method, and a program for suppressing thermal deformation and setting an easily removable support part.SOLUTION: Provided is a data creation device which when laminating a product with a three-dimensional lamination device, sets a support part that supports the product, the data creation device comprising: a database for storing a mathematical model in which relationship between the strength characteristic and of the support part a warp prevention stress limit is formulated; an analysis unit for performing stress analysis on the support part and the product; and a support part shape specification unit for specifying the shape of the support part that has the strength characteristic that corresponds to the warp prevention stress limit on the basis of the analysis result of the analysis unit and the mathematical model.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a data creation device, a three-dimensional stacking system, a setting method, and a program for setting a support unit that supports a three-dimensional stacked product in a three-dimensional stacked product that is stacked and shaped by a three-dimensional stacking device.

  A three-dimensional laminated product (hereinafter referred to as a product) that is laminated and shaped by a three-dimensional laminating apparatus (so-called 3D printer) is expected to be able to realize a complicated and precise part shape.

JP 2005-330141 A

  When laminating products, particularly when laminating products with complex shapes, the support portions that support the products are also laminated in parallel so that the shape is manufactured as intended. However, when the rigidity of the support portion is not sufficient, warpage occurs in the middle of the lamination, and it is not possible to proceed to the next lamination, and there is a problem that modeling to the intended shape cannot be performed. This is because thermal deformation (thermal contraction) occurs due to heat conduction during lamination, resulting in a shape difference from the design shape.

  Therefore, at present, the position, shape, etc. of the support part are set personally, the product is prototyped, and the presence or absence of thermal deformation is repeatedly checked, so there are many support part settings that can reduce thermal deformation. Takes time. On the other hand, since the support portion is removed after lamination, the rigidity of the support portion may not be strengthened. That is, the support portion is preferably rigid enough to suppress thermal deformation but be easily removed after lamination.

  For such a support part, various configurations can be selected. For example, various cross-sectional shapes can be selected for the cross-sectional shape of the support portion. However, at present, there is no clear guideline regarding what cross-sectional shape and what rigidity is optimal with regard to suppression of thermal deformation and ease of removal when modeling a product. For example, as one of the cross-sectional shapes of the support portion, a cross-girder structure as shown in FIG. 4 to be described later is used, but the thickness and interval of the cross-girder structure that determines the rigidity is set by repeating trial and error. doing.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a data creation device, a three-dimensional stacking system, a setting method, and a program that suppress thermal deformation and set a support portion that is easy to remove.

The support part setting system according to the first aspect that solves the above problem is as follows.
In a support part setting system for setting a support part for supporting the product when the product is laminated by a three-dimensional laminating apparatus,
A database in which a plurality of mathematical models that formulate the relationship between the strength characteristics of the support and the warp prevention stress limit are stored;
A computer for setting the support unit with reference to the database;
The computer
A setting step for setting strength characteristics of the support part;
An analysis step for performing stress analysis on the support and the product;
Based on the stress analysis performed in the analysis step, a calculation step for calculating a stress value of the support part;
Referring to the mathematical model of the database, whether or not warpage occurs in the product or the support unit based on the strength characteristic set in the setting step and the stress value calculated in the calculation step. A first determination step for determining;
When it is determined that warpage occurs in the first determination step, based on the mathematical model of the database, the strength characteristic is corrected within a range not exceeding the warp prevention stress limit, and the corrected strength characteristic is A first correction step of correcting the support portion in a corresponding configuration is performed.

The support part setting system according to the second aspect that solves the above problem is as follows.
In the support unit setting system according to the first aspect,
The computer
A second determination step for determining that the support portion is difficult to remove when the strength characteristic after setting or correction exceeds a predetermined reference value;
When it is determined in the second determination step that the support portion is difficult to remove, the intensity characteristic is corrected to a range not exceeding the reference value by referring to the mathematical model of the database, and the corrected intensity And a second correction step of correcting the support portion in a configuration corresponding to the characteristic.

A support unit setting system according to a third aspect for solving the above-described problem is as follows.
In the support unit setting system according to the second aspect,
The computer, when the support portion is corrected, based on the corrected support portion, the analysis step, the calculation step, the first determination step, the first correction step, the second determination The step and the second correction step are performed again.

A support part setting system according to a fourth aspect for solving the above-described problem is as follows.
In the support unit setting system according to any one of the first to third aspects,
The first determination step compares the stress value calculated in the calculation step with the warpage prevention stress limit on the mathematical model for the strength characteristics after setting or correction, and the stress value is the warpage prevention. When the stress limit is exceeded, it is determined that warpage occurs in the product or the support portion.

A support part setting system according to a fifth aspect for solving the above problem is as follows.
In the support unit setting system according to any one of the first to fourth aspects,
The computer performs a formulation step for formulating a relationship between strength characteristics of the support portion and warpage prevention stress limit based on stress strain diagrams of the support portion having various configurations. .

A three-dimensional laminating apparatus according to a sixth aspect that solves the above problem is as follows.
The product including the support part is stacked based on modeling data for stacking the support part and the product set by the support part setting system according to any one of the first to fifth aspects. It is characterized by doing.

The support part setting method according to a seventh aspect for solving the above-described problem is
In a support part setting method for setting a support part that supports the product when the product is laminated by a three-dimensional laminating apparatus,
A setting step for setting strength characteristics of the support part;
An analysis step for performing stress analysis on the support and the product;
Based on the stress analysis performed in the analysis step, a calculation step for calculating a stress value of the support part;
Using a database in which a plurality of mathematical models that formulate the relationship between the strength characteristics of the support part and the warp prevention stress limit are stored, referring to the mathematical model that the database has, the set in the setting step A first determination step of determining whether warpage occurs in the product or the support portion based on the strength characteristic and the stress value calculated in the calculation step;
When it is determined that warpage occurs in the first determination step, based on the mathematical model of the database, the strength characteristic is corrected within a range not exceeding the warp prevention stress limit, and the corrected strength characteristic is And a correction step of correcting the support portion in a corresponding configuration.

The support part setting method according to an eighth aspect for solving the above problem is as follows.
In the support part setting method according to the seventh aspect,
A second determination step for determining that the support portion is difficult to remove when the strength characteristic after setting or correction exceeds a predetermined reference value;
When it is determined in the second determination step that the support portion is difficult to remove, the intensity characteristic is corrected to a range not exceeding the reference value by referring to the mathematical model of the database, and the corrected intensity And a second correction step of correcting the support portion in a configuration corresponding to the characteristic.

The support part setting method according to the ninth aspect for solving the above problem is as follows.
In the support part setting method according to the eighth aspect,
When the support portion is modified, based on the modified support portion, the analysis step, the calculation step, the first determination step, the first correction step, the second determination step, and the first The second correction step is performed again.

A support part setting method according to a tenth aspect for solving the above problem is as follows.
In the support part setting method according to any one of the seventh to ninth aspects,
The first determination step compares the stress value calculated in the calculation step with the warpage prevention stress limit on the mathematical model for the strength characteristics after setting or correction, and the stress value is the warpage prevention. When the stress limit is exceeded, it is determined that warpage occurs in the product or the support portion.

A support part setting method according to an eleventh aspect for solving the above problem is as follows.
In the support part setting method according to any one of the seventh to tenth aspects,
It has a formulation process for formulating a relationship between strength characteristics of the support part and warpage prevention stress limit based on stress strain diagrams for the support part of various configurations.

A three-dimensional stacking method according to a twelfth aspect for solving the above problem is
The product including the support part is laminated based on modeling data for laminating the support part and the product set by the support part setting method according to any one of the seventh to eleventh aspects. It is characterized by doing.

A support part setting program according to a thirteenth aspect for solving the above problem is as follows.
It makes a computer perform the support part setting method as described in any one of the said 7th-11th aspect, It is characterized by the above-mentioned.

A data creation device according to a fourteenth aspect for solving the above problem,
A data creation device for setting a support portion for supporting the product when the product is laminated by a three-dimensional laminating device,
A database that stores a mathematical model that formulates the relationship between the strength characteristics of the support and the warpage prevention stress limit;
An analysis unit for analyzing stress applied to the support unit and the product by a lamination process;
Based on the analysis result of the stress applied to the support part and the product by the analysis part and the mathematical model, the stress of the support part having the strength characteristic that the stress applied to the support part does not exceed the warp prevention stress limit. A support part shape specifying part for specifying the shape;
It is characterized by providing.

A data creation device according to a fifteenth aspect for solving the above problem,
The support part shape specifying part is
When it is determined that the product is warped based on the analysis result of the stress applied to the support portion, based on the analysis result and the mathematical model, the warpage preventing stress limit is not exceeded. The strength characteristic is corrected, and the shape of the support portion is specified based on the corrected strength characteristic.

A data creation device according to a sixteenth aspect for solving the above problem,
A posture changing unit for changing the posture of the product;
A support unit necessity determination unit that determines whether or not the support unit is necessary when the posture change unit changes the posture; and
The support part shape specifying part is
Based on the analysis result and the mathematical model of the stress applied to the support unit and the product, the posture changing unit changing the posture when the support unit is necessary and the support unit necessity determining unit determines The shape of the support portion having the strength characteristic corresponding to the warp prevention stress limit is specified.

A data creation device according to a seventeenth aspect for solving the above problem,
The posture changing unit
When the strength characteristic is corrected so that the stress applied to the support part by the support part shape specifying part does not exceed the warp prevention stress limit, the corrected strength characteristic is equal to or higher than the upper limit value of the strength characteristic. The posture of the product is changed.

A data creation device according to an eighteenth aspect for solving the above problem is as follows.
The posture changing unit is
When the strength characteristic is equal to or lower than the lower limit value of the strength characteristic when the strength characteristic is corrected in a range where the stress applied to the support part by the support part shape specifying part does not exceed the warp prevention stress limit, It is characterized by changing the attitude of the product.

A data creation device according to a nineteenth aspect for solving the above problem,
Whether or not the support part is deformed with the movement of the recoater when the product is rotated around an axis perpendicular to the plane of movement of the recoater when the posture changing unit laminates the product. A deformation determination unit for determining,
It is characterized by providing.

A data creation device according to a twentieth aspect for solving the above problem,
A computer for setting the support unit with reference to the database;
The computer
A setting step for setting strength characteristics of the support part;
An analysis step for performing stress analysis on the support and the product;
Based on the stress analysis performed in the analysis step, a calculation step for calculating a stress value of the support part;
Referring to the mathematical model of the database, whether or not warpage occurs in the product or the support unit based on the strength characteristic set in the setting step and the stress value calculated in the calculation step. A first determination step for determining;
When it is determined that warpage occurs in the first determination step, based on the mathematical model of the database, the strength characteristic is corrected within a range not exceeding the warp prevention stress limit, and the corrected strength characteristic is A first correction step of correcting the support portion to a corresponding configuration;
A second determination step for determining that the support portion is difficult to remove when the strength characteristic after setting or correction exceeds a predetermined reference value;
When it is determined in the second determination step that the support portion is difficult to remove, the intensity characteristic is corrected to a range not exceeding the reference value by referring to the mathematical model of the database, and the corrected intensity And a second correction step of correcting the support portion in a configuration corresponding to the characteristic.

A data creation device according to a twenty-first aspect that solves the above-described problem,
The computer is
When the support portion is modified, based on the modified support portion, the analysis step, the calculation step, the first determination step, the first correction step, the second determination step, and the first The second correction step is performed again.

A data creation device according to a twenty-second aspect for solving the above problem,
The computer is
The present invention is characterized in that a formulation step for formulating a relationship between strength characteristics of the support portion and warpage prevention stress limit is performed based on stress strain diagrams of the support portion having various configurations.

A three-dimensional stacking system according to a twenty-third aspect that solves the above-described problem,
Any of the above data creation devices;
A three-dimensional laminating apparatus for modeling a three-dimensional product based on the modeling data generated by the data creation apparatus;
It is characterized by providing.

The control method of the data creation device according to the twenty-fourth aspect for solving the above problem is as follows:
When a product is laminated by a three-dimensional laminating apparatus, a database for storing a mathematical model that formulates the relationship between the strength characteristics of the support portion supporting the product and the warpage prevention stress limit is provided, and the method for setting the support portion There,
Analyzing the stress applied to the support part and the product by a lamination process;
Based on the analysis result obtained by the analysis and the mathematical model, specifying the shape of the support part having the strength characteristic that the stress applied to the support part does not exceed the warp prevention stress limit;
It is characterized by including.

A program according to a twenty-fifth aspect for solving the above problem is
When laminating products with a three-dimensional laminating apparatus, a computer for setting a support portion for supporting the products,
Storing a mathematical model that formulates the relationship between the strength characteristics of the support and the warp prevention stress limit;
Analyzing the stress applied to the support part and the product by a lamination process;
Based on the analysis result obtained by the analysis and the mathematical model, specifying the shape of the support part having the strength characteristic that the stress applied to the support part does not exceed the warp prevention stress limit;
Is executed.

  According to the present invention, since the thermal deformation is suppressed and the ease of removal is determined for the support part of the three-dimensional laminated product, a support part having appropriate rigidity can be set. As a result, a three-dimensional laminated product can be manufactured using a support portion having appropriate rigidity, and the product quality can be improved.

It is a figure which shows an example of embodiment of the support part setting system which concerns on this invention, Comprising: It is the schematic which shows the computer and 3D laminating apparatus which have the said system. It is a figure which shows an example of the support part setting method implemented with the computer shown in FIG. 1, Comprising: It is a flowchart explaining the production method of product shape data and modeling data containing the said method. It is a flowchart explaining the preparation method of the reference data used with the computer shown in FIG. It is a figure which illustrates the support part to test or analyze by the flowchart shown in FIG. 3, (a) is a cross-sectional shape of a cross-girder structure with a wide space | interval, (b) is a cross-section of a cross-girder structure with a medium space | interval. (C) is a cross-sectional shape of a cross beam structure with a narrow interval. 4 is a graph showing Young's modulus and warpage prevention criteria formulated in the flowchart shown in FIG. 3. FIG. 4 is a second graph showing Young's modulus and warpage prevention criteria formulated in the flowchart shown in FIG. 3. It is the 2nd figure which shows an example of the support part setting method implemented with the computer shown in Drawing 1, Comprising: It is the 2nd flow chart explaining the creation method of product shape data and modeling data including the method concerned. It is a figure which shows an example of the three-dimensional laminating apparatus shown in FIG. FIG. 9 is a third flowchart illustrating an example of a support setting method performed by the computer illustrated in FIG. 1, and is a third flowchart illustrating a method for creating product shape data and modeling data including the method. FIG. 10 is a fourth flowchart illustrating an example of a support setting method performed by the computer illustrated in FIG. 1, and is a fourth flowchart illustrating a method for creating product shape data and modeling data including the method. It is a figure which shows an example of a structure of the computer shown in FIG.

  Hereinafter, embodiments of a support setting system, method, program, three-dimensional laminating apparatus, and method according to the present invention will be described with reference to FIGS.

[Example 1]
In the present embodiment, as shown in FIG. 1, the data creation device 10 is connected to a three-dimensional stacking device 30 via a network 20. Here, one three-dimensional laminating apparatus 30 is illustrated, but a plurality of three-dimensional laminating apparatuses 30 may be connected.

  The data creation device 10 is, for example, a computer. The device configuration includes an arithmetic device, a storage device, a communication device, and the like (not shown). The functional configuration includes a product shape creation unit 11, a modeling data creation unit 12, A reference data creation unit 13 and a database (hereinafter referred to as DB) 14 are provided. This modeling data preparation part 12 contains the support part setting system and method of a present Example.

  The product shape creating unit 11 creates 3D shape data of the product. This is a so-called CAD (Computer Aided Design) program.

  Further, the modeling data creation unit 12 creates modeling data to be used by the three-dimensional laminating device 30 based on the three-dimensional shape data created by the product shape creating unit 11 and gives an operation instruction to the three-dimensional laminating device 30. ing. This is a so-called CAM (Computer Aided Manufacturing) program, and the support part setting program of this embodiment is included here.

  Further, the reference data creation unit 13 creates reference data to be registered in the DB 14. This is a so-called CAE (Computer Aided Engineering) program.

  The DB 14 includes a storage device and the like, and a database is constructed by registering a plurality of reference data created by the reference data creation unit 13.

  In FIG. 1, the product shape creation unit 11, the modeling data creation unit 12, the reference data creation unit 13, and the DB 14 are configured to have one data creation device 10, but the product shape creation unit 11, the modeling data creation unit 12. The reference data creation unit 13 and the DB 14 may be configured by devices (computers) independent of each other. In this case, the DB 14 may be a database server and connected to each other via the network 20.

  Details of the product shape creation unit 11, the modeling data creation unit 12, the reference data creation unit 13, and the DB 14 will be described later with reference to FIGS.

  The network 20 is a network such as Ethernet (registered trademark), and may be wired or wireless. Furthermore, a network such as the Internet may be used. In this case, even if the three-dimensional stacking device 30 is located at a remote location of the data creation device 10, communication is possible via the network 20. On the other hand, when the data creation device 10 and the three-dimensional stacking device 30 can be arranged close to each other, they may be directly connected without using the network 20.

  There are various types of three-dimensional laminating apparatuses, but the three-dimensional laminating apparatus 30 is a material obtained by sintering or melting and solidifying a thinly laminated powder with a laser (or electron beam), and sintering or melting and solidifying the powder. This is a “Powder Bed Fusion” device that forms a three-dimensional product by stacking layers. Similarly, an apparatus of a method for sintering or melting and solidifying a material, for example, an apparatus of “Directed Energy Deposition method” may be used.

  Then, referring to FIGS. 2 to 5 together with FIG. 1, a method for creating product shape data, modeling data, and reference data including the support unit setting method of the present embodiment, which is performed by the data creation device 10, will be described. First, a method for creating reference data will be described with reference to FIGS. The reference data shown in FIG. 3 is created before the modeling data shown in FIG.

(Step S21)
In addition to setting the configuration (external shape, cross-sectional shape, frame portion size, interval, etc.) of the support for creating the reference data, a change condition for the set configuration of the support is set. Here, as an example, as shown in FIGS. 4A to 4C, a prism is set as an outer shape, a cross-girder structure is set as a cross-sectional shape, and a plurality of mesh densities (cross-girder structure) are set as change conditions. The interval of the skeleton part) is set. In addition, about the dimension of a frame part here, a constant value is used, without changing conditions.

  Specifically, based on the configuration and change conditions of the set support portion, the support portion to be evaluated is the support portion A shown in FIG. ), Support portion B shown in FIG. 4B (medium mesh density = medium spacing between the frame portions of the cross-beam structure), and support portion C shown in FIG. 4C (fine mesh density = cross-beam structure) The space between the frame parts is narrow). That is, the support portions A, B, and C have similar cross-sectional shapes except for the mesh density.

  Here, a prism is set as the outer shape of the configuration of the support portion, and a cross-girder structure is set as the cross-sectional shape. However, for example, a polygonal column structure or a honeycomb structure may be used.

  In addition, the changing condition is not limited to the mesh density described above (interval between the frame portions of the cross-girder structure), and it is desirable to set various conditions and create reference data to be described later. For example, the size (thickness) of the frame portion of the cross-girder structure may be set as the change condition, or the content rate of the material of the frame portion forming the cross-girder structure may be set as the change condition.

(Step S22)
A stacking test for actually stacking the plurality of types of support portions A, B, and C set in step S21 using the three-dimensional stacking apparatus 30 is performed. Alternatively, since the lamination test takes time and cost, a lamination analysis by a lamination analysis program may be performed instead.

(Step S23)
A tensile test is actually performed on a plurality of types of support portions A, B, and C subjected to the lamination test in step S23 using a tensile test apparatus. Alternatively, since the tensile test takes time and cost, a tensile analysis by a tensile test program may be performed instead. By this tensile test or tensile analysis, stress strain diagrams for the support portions A, B, and C are obtained.

  The above-mentioned lamination analysis and tensile analysis are not limited to other parameters of the same change condition, but can be changed to other shapes and other change conditions as long as the reproducibility analysis for the lamination test and tensile test can be performed and the validity of the analysis method can be confirmed. Is also applicable. In this way, by associating the lamination test, the tensile test with the lamination analysis, and the tensile analysis, using the lamination analysis and the tensile analysis, the mathematical models described below are obtained for the support portions having various configurations, and these are obtained. It is also possible to create a database. Therefore, it is not necessary to perform a lamination test or a tensile test on all support parts.

(Step S24)
Based on the stress strain diagram obtained in step S23, the strength characteristics and warpage prevention criteria (warping prevention stress limit) for the support portions A, B, and C are acquired. Here, Young's modulus (rigidity) is used as the strength characteristic, but other physical quantities may be used as long as the strength characteristics are equivalent. In addition, the “Young's modulus” here is the Young's modulus (apparent Young's modulus) obtained including the hollow portion for a support portion having a cross-sectional shape with a hollow portion, such as the cross-girder structure shown in FIG. ). Further, the “warp prevention criteria” may be obtained from, for example, the stress of the elastic limit of the support portion (stress that returns to the original even when elastically deformed).

(Step S25)
It is determined whether or not the necessary number of the support units for creating the reference data has been acquired. If the required number has been acquired, the process proceeds to step S26. If the required number has not been acquired, the process returns to step S21 to repeat the above-described steps S21 to S24. . As the necessary number, it suffices if there is a number that can be formulated later for the set change condition.

  Here, as shown in the graph of FIG. 5, the support portion A having a wide interval between the frame portions of the cross beam structure, the support portion B having a medium interval between the frame portions of the cross beam structure, and the support having a narrow interval between the frame portions of the cross beam structure. With respect to the part C, data of Young's modulus and warpage prevention criteria are acquired, respectively, whereby data of warpage prevention criteria using the interval between the frame portions of the cross beam structure as parameters of the change condition is acquired.

(Step S26; formulation process)
Based on the acquired Young's modulus and warpage prevention criteria, the formulation is performed to obtain a mathematical model M like a curve shown in FIG. By obtaining such a mathematical model M, the determination performed in step S5 described later can be performed. The mathematical model M may be formulated using a known fitting function or the like.

(Step S27)
The mathematical model M obtained in step S26 is registered in the DB 14. By registering the mathematical model M for the support units having various configurations in the DB 14, it is possible to evaluate the support units having various configurations.

  The reference data creation unit 13 creates a mathematical model M that serves as reference data for determining thermal deformation suppression during product lamination as described above, registers a number of created mathematical models M in the DB 14, A database is being built. The DB 14 having a large number of formulated mathematical models M serves as a general-purpose tool when selecting an optimally configured support unit.

  Next, with reference to FIG. 2 together with FIG. 1, a method for creating product shape data and modeling data performed by the data creation device 10 will be described. This modeling data creation method includes the support part setting method of the present embodiment.

(Step S1)
In the product shape creation unit 11, product three-dimensional shape data (3D-CAD data) is created. If the product is a new product, the product shape creation unit 11 creates the 3D model by creating a 3D model. If there is already 3D shape data, the product shape creation unit 11 may input the 3D shape data. In the case of an existing product, the shape may be created by scanning the shape with a 3D scanner or the like.

(Step S2)
The modeling data creating unit 12 creates modeling data to be used by the three-dimensional laminating apparatus 30 based on the three-dimensional shape data created by the product shape creating unit 11. Specifically, it is performed according to the following steps S2-1 to S2-3.

(Step S2-1)
Set the stacking posture of the product to be stacked and shaped. This setting may be set by an operator, or may be set using a program for optimizing the stacking posture.

(Step S2-2; setting process)
Based on the set stacking posture, the support range (position, number, etc.) for supporting the product by the support part, and the configuration of the support part (outer shape, cross-sectional shape, frame part size, interval, etc.) are set. At this time, the Young's modulus is set in advance based on the set configuration of the support portion.

  The support range is set using a program that sets the position and number of support portions. As such a program, a program that minimizes the number of support portions and the like is desirable for cost reduction.

  Regarding the configuration of the support portion, an initial value may be set in advance, and initially this initial value may be used. Here, as an example, the outer shape of the support portion is a prism, the cross-sectional shape is a cross-girder structure, and initial values are used for the dimensions and intervals of the frame portions. Then, the three-dimensional shape data about the support portion is added to the three-dimensional shape data of the product.

(Step S2-3)
The three-dimensional shape data of the product including the support part is converted into slice data obtained by horizontally slicing and dividing the data, and modeling data to be used in the three-dimensional laminating apparatus 30 is created.

(Step S3; analysis process)
The modeling data creation unit 12 performs stress analysis of the product and the support unit. Specifically, the amount of thermal deformation is predicted by stress analysis of the modeling data created in step S2 (step S2-3) based on the material of the product used in the three-dimensional laminating apparatus 30 and the heating plan. For this, a known structural analysis program may be used.

(Step S4; calculation step)
Based on the thermal deformation amount predicted in step S3, a stress value generated in the product and the support portion is calculated.

(Step S5; first determination step)
With respect to the stress value of the support portion calculated in step S4, it is determined whether or not warpage occurs in the product or the support portion. If warpage does not occur, the process proceeds to step S6, and if warpage occurs, the process proceeds to step S7. This determination is made by referring to the reference data created by the reference data creation unit 13 and registered in the DB 14, specifically, referring to the mathematical model M as shown in FIG.

  For example, in the case of the pattern I shown in FIG. 5 (see the white circle in the pattern I), the Young's modulus of the support portion is 40000 MPa, and the stress value calculated in step S4 is 350 MPa. Since it is larger and the stress value causes warpage in the product and the support portion, the support portion needs to be reviewed.

(Step S6; second determination step)
For the Young's modulus of the support part, it is determined whether the support part is easily removed from the product. If it is easy to remove, the process proceeds to step S8, and if it is difficult to remove, the process proceeds to step S7. As shown in FIG. 5, this determination is based on the Young's modulus of the support part with respect to a predetermined reference value L for determining ease of removal, and determines whether the support part is easily removed or difficult to remove.

  For example, in the case of the pattern II shown in FIG. 5 (see the white circle in the pattern II), the Young's modulus of the support portion is 160000 MPa, and the stress value calculated in step S4 is 250 MPa. However, the Young's modulus of the support part is larger than the reference value L (here, L = 90000 MPa), and therefore the support part needs to be reviewed.

(Step S7; first and second correction steps)
If it is determined in step S5 that warpage occurs, and if it is determined in step S6 that the support portion is difficult to remove, the Young's modulus of the support portion is reviewed. Specifically, this is done with reference to a mathematical model M as shown in FIG. Here, the review of the Young's modulus of the support portion will be described for the pattern I and the pattern II shown in FIG.

  In the case of the pattern I in FIG. 5 (see the white circle in the pattern I), as described above, the stress value calculated in step S4 is larger than the mathematical model M, that is, the stress value at which warpage occurs in the product or the support portion. Therefore, it is necessary to review the support section. In this case, the calculated stress value is kept as it is, the Young's modulus is reviewed, and the Young's modulus is increased to 80000 MPa (see the black circle in pattern I), thereby making the calculated stress value smaller than the mathematical model M. At this time, the shape of the analysis model used for the stress analysis is not changed.

  In the case of pattern II in FIG. 5 (see the white circle in pattern II), as described above, the Young's modulus of the support portion is larger than the reference value L, that is, the support portion is difficult to remove from the product. Review of the department is necessary. Also in this case, the Young's modulus is reconsidered with the calculated stress value as it is, and the Young's modulus is made smaller than 40000 MPa (see the black circle in the pattern II), thereby making the Young's modulus smaller than the reference value L. At this time, the shape of the analysis model used for the stress analysis is not changed.

  Then, after reviewing the support portion in step S7, the process returns to step S3, and using the Young's modulus corrected by the review, the stress analysis of the product and the support portion is performed in step S3 as described above, and step S4 is performed. In step S5, the stress value of the support part is calculated. In step S5, it is determined whether the product or the support part is warped. In step S6, it is determined whether the support part is easily detached from the product. Steps S3 to S7 are repeated until the conditions of steps S5 and S6 are satisfied. If no solution satisfying the conditions of steps S5 and S6 is found, the process returns to step S2, and the stacking posture and the support range, which are settings other than the configuration of the support portion, may be reviewed.

(Step S8)
When it is determined that the conditions of steps S5 and S6 are satisfied, the set or corrected Young's modulus is determined as the rigidity of the support portion. For example, in the case of the pattern I in FIG. 5 (see the black circle in the pattern I), the Young's modulus of 80000 MPa is determined as the rigidity of the support, and in the case of the pattern II in FIG. 5 (see the black circle in the pattern II), the Young's modulus is 40000 MPa. Is determined as the stiffness of the support.

(Step S9)
Based on the rigidity of the support portion determined in step S8, the configuration of the support portion is determined. Here, since the reference data in which the mesh density (interval between the frame portions of the cross-girder structure) is set is referred to as the change condition (see FIG. 4), the mesh density (the girder-structure frame that becomes the rigidity determined in step S8) Determine the spacing between the parts.

(Step S10)
Based on the structure of the support part determined in step S9, the modeling data created in step S2 (step S2-3) is corrected. Specifically, the three-dimensional shape data of the support portion having the configuration determined in step S9 (interval of the frame portion of the cross-girder structure) is added to the three-dimensional shape data of the product, and the three-dimensional shape of the product including the support portion Data is converted into slice data, and modeling data used in the three-dimensional laminating apparatus 30 is corrected.

(Step S11)
The corrected modeling data is transmitted to the three-dimensional laminating apparatus 30, and a lamination start instruction is given to the three-dimensional laminating apparatus 30. Thereby, the three-dimensional laminating apparatus 30 will laminate | stack and model the product containing a support part based on the modeling data after correction.

  When the above is simply arranged, the modeling data creation unit 12 refers to the reference data registered in the DB 14 to determine the rigidity of the support unit necessary for product stacking and considers thermal deformation during product stacking. The support portion having the optimum rigidity (minimized) is automatically set. Then, the modeling data creation unit 12 creates modeling data for the product and the support unit.

  As described above, in the present invention, the support portion of the product to be modeled by the three-dimensional laminating apparatus 30 is subjected to suppression of thermal deformation and determination of ease of removal, so that a support portion having appropriate rigidity can be set. . And, reflecting the set support part, the product is laminated and shaped by the three-dimensional laminating apparatus, so the product can be manufactured using the support part having appropriate rigidity, and the product quality is improved. Can do.

  In addition, the time for setting an appropriate support portion can be significantly reduced as compared with the conventional case where the time is set by trial and error. Moreover, it can also be set as the general purpose tool which evaluates a support part by accumulating the reference data with respect to the support part of various structures, and building a database.

[Example 2]
The data creating apparatus 10 according to the present embodiment is warped in the product and the support part, and when the apparent Young's modulus exceeds the Young's modulus indicating the upper limit of difficulty of removing the support part from the product, Review the posture and re-stress the product and support.

The data creation device 10 is a device for setting a support portion that supports a product when the product is stacked by the three-dimensional stacking device.
The data creation device 10 includes a reference data creation unit 13, a DB 14, a modeling data creation unit 12 (an analysis unit, a posture change unit, a support unit shape identification unit, a deformation determination unit), and a product shape creation unit 11. .

The product shape creation unit 11 creates product three-dimensional shape data.
The reference data creation unit 13 creates a mathematical model M and registers the created many mathematical models M in the DB 14.

The DB 14 stores a mathematical model M that formulates the relationship between the strength characteristics of the support portion and the warp prevention stress limit.
The strength characteristic indicates the strength of the product and the support part, and is indicated by an apparent Young's modulus that varies depending on the material and structure constituting the product and the support part.
The warpage prevention stress limit is a minimum value of stress at which warpage does not occur when a product or a support is laminated, and is a value indicating a limit stress at which the product or the support is not damaged.

The modeling data creation unit 12 analyzes stress on the support unit and the product.
In addition, the modeling data creation unit 12 changes the posture of the product. Specifically, the modeling data creation unit 12 determines the product posture when the strength characteristic exceeds a predetermined upper limit when the strength characteristic is corrected within a range in which the stress applied to the support part does not exceed the warp prevention stress limit. change. For example, as shown in FIG. 6, when the upper limit value of the apparent Young's modulus, which is the upper limit value of the strength characteristics, is 90000 MPa indicated by L, the apparent Young's modulus is the upper limit value when the warpage prevention criteria is about 380 MPa or more. Exceed. In such a case, the modeling data creation unit 12 changes the posture of the product to reduce the apparent Young's modulus.

Based on the analysis result and the mathematical model, the modeling data creation unit 12 specifies the shape of the support unit having strength characteristics corresponding to the warp prevention stress limit. When the analysis result indicates that warpage occurs in the product, the modeling data creation unit 12 corrects the strength characteristics within a range not exceeding the warp prevention stress limit based on the analysis result and the mathematical model, and the corrected strength The shape of the support portion having strength characteristics corresponding to the characteristics is specified.
The modeling data creation unit 12 specifies the shape of the support unit having strength characteristics corresponding to the warp prevention stress limit based on the analysis result and the mathematical model when the posture of the product is changed.

Next, processing of the data creation device 10 according to the present embodiment will be described.
Here, the processing flow of the data creation device 10 shown in FIG. 7 will be described.

  The product shape creation unit 11 creates product three-dimensional shape data (step S1). For example, if it is a new product, the product shape creation unit 11 creates 3D shape data by creating a 3D model. If there is already three-dimensional shape data, the product shape creation unit 11 acquires the three-dimensional shape data. Further, if the product is an existing product, the product shape creation unit 11 creates a 3D shape data by scanning the shape with a 3D scanner or the like.

  The modeling data creation unit 12 creates modeling data used by the three-dimensional laminating apparatus 30 based on the three-dimensional shape data created by the product shape creation unit 11 (step S2). Specifically, the modeling data creation unit 12 performs the following steps S2-1 to S2-3 similar to the above-described steps S2-1 to S2-3.

  That is, the modeling data creation unit 12 sets the stacking posture of a product to be stacked and modeled using a program that optimizes the stacking posture (step S2-1). This setting may be set by the operator.

Based on the set stacking posture, the modeling data creation unit 12 supports the product with the support unit (position, number, etc.), and the configuration of the support unit (external shape, cross-sectional shape, frame part size, interval, etc.) Is set (step S2-2). At this time, the modeling data creation unit 12 presets the Young's modulus based on the set configuration of the support unit.
The modeling data creation unit 12 sets the support range using a program that sets the position and number of the support units. As such a program, a program that minimizes the number of support portions and the like is desirable for cost reduction.
The modeling data creation unit 12 sets an initial value in advance for the configuration of the support unit. The modeling data creation unit 12 initially uses this initial value. Here, as an example, the outer shape of the support part is a prism, the cross-sectional shape is a cross-girder structure, and the modeling data creation unit 12 uses initial values for the dimensions and intervals of the frame parts. And the modeling data preparation part 12 adds the three-dimensional shape data about a support part to the three-dimensional shape data of a product.

  The modeling data creation unit 12 creates modeling data to be used in the three-dimensional laminating apparatus 30 by converting the three-dimensional shape data of the product including the support unit into slice data obtained by horizontally slicing and dividing the data. Step S2-3).

  Next, the modeling data creation part 12 (analysis part) performs stress analysis of a product and a support part (step S3). Specifically, the modeling data creation unit 12 predicts the amount of thermal deformation based on the material of the product used in the three-dimensional laminating apparatus 30 and the heating plan for the modeling data created in step S2-3 by stress analysis. To do. The modeling data creation unit 12 (analysis unit) may predict the amount of thermal deformation using a known structural analysis program.

  The modeling data creation unit 12 calculates a stress value generated in the product and the support unit based on the predicted thermal deformation amount (step S4).

The modeling data creation unit 12 determines whether or not warpage occurs in the product or the support unit with respect to the calculated stress value of the support unit (step S5).
Specifically, the modeling data creation unit 12 performs this determination with reference to, for example, the standard data shown in FIG. 6 created by the standard data creation unit 13 and registered in the DB 14.
For example, in the case of the pattern I shown in FIG. 6 (see the white circle in the pattern I), the apparent Young's modulus of the support portion is 40000 MPa, and the stress value calculated in step S4 is 350 MPa. Therefore, the modeling data creation unit 12 determines that the calculated stress value is larger than the mathematical model M and is a stress value at which warpage occurs in the product or the support unit (NO in step S5). For example, in the case of the pattern III shown in FIG. 6 (see the white circle in the pattern III), the apparent Young's modulus of the support portion is 55000 MPa, and the stress value calculated in step S4 is 400 MPa. Therefore, the modeling data creation unit 12 determines that the calculated stress value is larger than the mathematical model M and is a stress value at which warpage occurs in the product or the support unit (NO in step S5). For example, in the case of the pattern II shown in FIG. 6 (see the white circle in the pattern II), the apparent Young's modulus of the support portion is 160000 MPa, and the stress value calculated in step S4 is 250 MPa. Therefore, the modeling data creation unit 12 determines that the calculated stress value is smaller than the mathematical model M and is a stress value that does not cause warpage in the product or the support unit (YES in step S5).

When the modeling data creation unit 12 determines that warpage occurs (NO in step S5), the apparent Young's modulus of the support unit is on the mathematical model M associated with the warp prevention limit equal to the stress value according to the analysis result. Review the apparent Young's modulus (step S7).
Specifically, in the case of the pattern I shown in FIG. 6, the modeling data creation unit 12 revises the apparent Young's modulus of 80000 MPa in which the stress value is 350 MPa in the mathematical model M. Specifically, in the case of the pattern III shown in FIG. 6, the modeling data creation unit 12 revises the apparent Young's modulus of 110000 MPa, where the stress value is 400 MPa in the mathematical model M.

The modeling data creation unit 12 determines whether or not the apparent Young's modulus after the review exceeds the upper limit value L set to the same value as the reference value L (step S12).
For example, when the upper limit L of the apparent Young's modulus is 90000 MPa, the modeling data creation unit 12 exceeds the upper limit L of the apparent Young's modulus with respect to the apparent Young's modulus after reviewing the pattern I shown in FIG. Judge that it is not. Further, for example, the modeling data creating unit 12 determines that the apparent Young's modulus after reviewing the pattern III shown in FIG. 6 exceeds the upper limit L of the apparent Young's modulus.

If the modeling data creation unit 12 determines that the upper limit value L of the apparent Young's modulus is not exceeded (NO in step S12), the modeling data creation unit 12 returns to the process of step S3.
If the modeling data creation unit 12 determines that the upper limit L of the apparent Young's modulus is exceeded (YES in step S12), the modeling data creation unit 12 returns to the process of step S2 and relies on the attitude of the product after the previous optimization. Change to product posture.

If it is determined that warpage does not occur (YES in step S5), the modeling data creating unit 12 determines whether the support part is easily removed from the product with respect to the apparent Young's modulus of the support part (step S6).
Specifically, if the modeling data creation unit 12 determines that the apparent Young's modulus of the support unit is greater than the reference value L (90000 MPa in FIG. 6), it determines that the support unit is difficult to remove from the product (step S6). NO). For example, in the case of Pattern II shown in FIG. 6 (see the white circle in Pattern II), the Young's modulus of the support portion is 160000 MPa, and the stress value calculated in Step S4 is 250 MPa. judge. Specifically, if the modeling data creation unit 12 determines that the apparent Young's modulus of the support unit is smaller than the reference value L, it determines that the support unit is easily removed from the product (YES in step S6).

  If the modeling data creation unit 12 determines that the support unit is difficult to remove from the product (NO in step S6), the modeling data creation unit 12 proceeds to the process of step S7.

  If it is determined that the support part is easily removed from the product (YES in step S6), the modeling data creating unit 12 determines the set or corrected Young's modulus as the rigidity of the support part (step S8). For example, in the case of the pattern I in FIG. 5 (see the black circle in the pattern I), the modeling data creating unit 12 determines a Young's modulus of 80000 MPa as the rigidity of the support unit. For example, in the case of the pattern II in FIG. 5 (see the black circle in the pattern II), the modeling data creation unit 12 determines a Young's modulus of 40000 MPa as the rigidity of the support unit.

  The modeling data creation unit 12 determines the configuration of the support unit based on the determined rigidity of the support unit (step S9). Specifically, the modeling data creating unit 12 is a reference in which the relationship between the change condition, that is, the determined rigidity of the support part and the mesh density (interval of the frame portion of the cross-girder structure) corresponding to the rigidity of the support part is set in advance. With reference to the data (see, for example, FIG. 4), the mesh density (interval between the frame portions of the cross beam structure) that determines the rigidity is determined.

  The modeling data creation unit 12 corrects the modeling data created in step S2-3 based on the determined configuration of the support unit (step S10). Specifically, the modeling data creation unit 12 adds the three-dimensional shape data of the support portion having the determined configuration (interval of the frame portion of the cross-girder structure) to the three-dimensional shape data of the product, and the product including the support portion The three-dimensional shape data is converted into slice data, and the modeling data used in the three-dimensional laminating apparatus 30 is corrected.

  The modeling data creation unit 12 transmits the corrected modeling data to the three-dimensional laminating apparatus 30 and instructs the three-dimensional laminating apparatus 30 to start stacking (step S11). Thereby, the three-dimensional laminating apparatus 30 will laminate | stack and model the product containing a support part based on the modeling data after correction.

The example 2 in the embodiment of the present invention has been described above. The data creation device 10 according to the second embodiment includes a DB 14, a modeling data creation unit 12, and a product shape creation unit 11. The DB 14 stores a mathematical model M that formulates the relationship between the strength characteristics of the support portion and the warp prevention stress limit. The modeling data creation unit 12 analyzes stress on the support unit and the product. In addition, the modeling data creation unit 12 changes the posture of the product. Based on the analysis result of the modeling data creation unit 12 and the mathematical model M, the product shape creation unit 11 identifies the shape of the support unit having strength characteristics corresponding to the warp prevention stress limit.
In other words, the modeling data creation unit 12 changes the posture of the product when the product shape creation unit 11 corrects the strength characteristic within a range that does not exceed the warp prevention stress limit, and the product shape creation unit 11 exceeds the upper limit value of the strength characteristic. Then, the product shape creation unit 11 determines the shape of the support part having strength characteristics corresponding to the warp prevention stress limit based on the analysis result when the modeling data creation unit 12 changes the attitude of the product and the mathematical model M. Identify.

  Thus, since the data creation device 10 according to the second embodiment performs suppression of thermal deformation and determination of ease of removal of the support portion of the product formed by the three-dimensional laminating apparatus 30, the support portion having appropriate rigidity. Can be set. And since the data preparation apparatus 10 by Example 2 provides the upper limit of an intensity | strength characteristic and determines difficulty of removal about a support part, it can avoid producing the product which has a support part which is hard to remove.

[Example 3]
When the recoater provided in the three-dimensional laminating apparatus 30 moves in the process of modeling the product by the three-dimensional laminating apparatus 30, the support part may be damaged.

Here, the three-dimensional laminating apparatus 30 provided with a recoater will be described.
The three-dimensional laminating apparatus 30 is an apparatus for modeling a product having a laminated structure.
As shown in FIG. 8, the three-dimensional laminating apparatus 30 includes a modeling platform 101, a metal frame 102, an uncured powder 103, a lens 104, a recoater 105, a powder 106, a laser beam 109, and a modeled object 110.

The modeling platform 101 is a plate that supports the bottom surface of the modeled object when the three-dimensional laminating apparatus 30 models the modeled object 110 having a laminated structure.
The metal frame 102 is a container that stores an uncured powder 103 that is a raw material of the shaped object 110.

  The uncured powder 103 is a material that cures when irradiated with a laser beam 109 that is a raw material of the shaped object 110. The uncured powder 103 is cured to become a shaped object 110.

The lens 104 irradiates the uncured powder 103 with the focused laser beam 109.
The recoater 105 moves in the plane direction (for example, the left-right direction in FIG. 8) in which the shaped objects are stacked while spreading the powder contained in the recoater 105, and flattens the dispersed powder 106.

The three-dimensional laminating apparatus 30 irradiates a flat surface with a laser to cure the powder 106 and laminate the shaped object 110.
The modeling platform 101 is lowered.
The three-dimensional laminating apparatus 30 moves in the plane direction in which the shaped object 110 is laminated while rolling the powder 106 using the recoater 105 to flatten the scattered powder.
The three-dimensional laminating apparatus 30 irradiates a flat surface with a laser to cure the powder 106 and laminate the shaped object 110. By repeating this, the three-dimensional laminating apparatus 30 generates the shaped object 110.

  The data creation apparatus 10 according to the present embodiment sets the apparent lower limit Lo of the Young's modulus that does not break the support portion even when the recoater 105 moves as described above. Then, when the stress applied to the support portion is equal to or lower than the lower limit Lo of the apparent Young's modulus, the data generation device 100 reviews the product posture and re-analyzes the product and the support portion.

  When it is determined that warpage occurs, the modeling data creation unit 12 reexamines the apparent Young's modulus of the support portion to the apparent Young's modulus on the mathematical model M associated with the warp prevention limit equal to the stress value. The modeling data creation unit 12 determines whether or not the apparent Young's modulus after the review is equal to or lower than the lower limit Lo. If the modeling data creation unit 12 determines that the apparent Young's modulus after the review exceeds the lower limit Lo, whether or not the apparent Young's modulus after the review exceeds the upper limit L of the apparent Young's modulus Determine. Moreover, the modeling data preparation part 12 changes the attitude | position of a product, when it determines with the apparent Young's modulus after review being the lower limit Lo or less. Then, the modeling data creation unit 12 determines again whether or not the apparent Young's modulus after the review exceeds the upper limit L of the apparent Young's modulus.

  Further, when the modeling data creating unit 12 determines that the support part is difficult to remove from the product, the apparent Young's modulus exceeds the lower limit Lo with the stress value as it is, and the apparent Young's modulus is smaller than the upper limit L. The product posture is changed so that the stress analysis of the product and the support is performed again.

Next, processing of the data creation device 10 according to the present embodiment will be described.
Here, the processing flow of the data creation device 10 shown in FIG. 9 will be described.
Here, the Young's modulus Lo indicating the lower limit value of the ease of removal when removing the support portion from the product is set in advance, and the apparent Young's modulus is different from the processing flow shown in FIG. A process when the Young's modulus is equal to or lower than the lower limit value of the ease of removal when removing will be described.

  The data creation device 10 performs the process of step S5. When it is determined that warping occurs (NO in step S5), the modeling data creation unit 12 reviews the apparent Young's modulus of the support portion so that the apparent Young's modulus on the mathematical model M when the stress value remains as it is. (Step S7).

The modeling data creation unit 12 determines whether or not the apparent Young's modulus after the review is equal to or lower than the lower limit Lo (step S13).
If the modeling data creation unit 12 determines that the apparent Young's modulus after the review exceeds the lower limit Lo (NO in step S13), the modeling data creation unit 12 proceeds to the process of step S12.
Further, if the modeling data creation unit 12 determines that the apparent Young's modulus after the review is equal to or lower than the lower limit Lo (YES in step S13), the modeling data creation unit 12 returns to the process of step S2.

  If the modeling data creation unit 12 determines that the support unit is difficult to remove from the product (NO in step S6), the modeling data creation unit 12 returns to the process of step S7.

The example 3 in the embodiment of the present invention has been described above. The data creation device 10 according to the third embodiment includes a DB 14, a modeling data creation unit 12, and a product shape creation unit 11. The DB 14 stores a mathematical model M that formulates the relationship between the strength characteristics of the support portion and the warp prevention stress limit. The modeling data creation unit 12 analyzes stress on the support unit and the product. In addition, the modeling data creation unit 12 changes the posture of the product. Based on the analysis result of the modeling data creation unit 12 and the mathematical model M, the product shape creation unit 11 identifies the shape of the support unit having strength characteristics corresponding to the warp prevention stress limit. Then, when it is determined that warping occurs, the modeling data creation unit 12 reviews the apparent Young's modulus of the support portion so that the apparent Young's modulus on the mathematical model M when the stress value remains as it is. The modeling data creation unit 12 determines whether or not the apparent Young's modulus after the review is equal to or lower than the lower limit Lo. If the modeling data creation unit 12 determines that the apparent Young's modulus after the review exceeds the lower limit Lo, whether or not the apparent Young's modulus after the review exceeds the upper limit L of the apparent Young's modulus Determine. Moreover, the modeling data preparation part 12 changes the attitude | position of a product, when it determines with the apparent Young's modulus after review being the lower limit Lo or less. Then, the modeling data creation unit 12 determines again whether or not the apparent Young's modulus after the review exceeds the upper limit L of the apparent Young's modulus. In addition, when the modeling data creating unit 12 determines that the support part is difficult to remove from the product, the product is such that the apparent Young's modulus exceeds the lower limit Lo and the apparent Young's modulus is smaller than L with the stress value unchanged. Change the posture of the product and perform the stress analysis of the product and support part again. The product shape creation unit 11 specifies the shape of the support unit having strength characteristics corresponding to the warp prevention stress limit based on the analysis result when the modeling data creation unit 12 changes the attitude of the product and the mathematical model M. .
In other words, when the product shape creation unit 11 corrects the strength characteristics within a range that does not exceed the warp prevention stress limit, the modeling data creation unit 12 breaks the support part due to the movement of the recoater when stacking the products. The product posture is changed when it is below the lower limit of the strength characteristic indicating that the product is not used. And the product shape creation part 11 specifies the shape of the support part which has the intensity | strength characteristic corresponding to a warp prevention stress limit based on the analysis result when the modeling data creation part 12 changes the attitude | position of a product, and a mathematical model. To do.

  Thus, since the data creation device 10 according to the third embodiment performs suppression of thermal deformation and determination of ease of removal of the support portion of the product to be modeled by the three-dimensional laminating device 30, the support portion having appropriate rigidity. Can be set. And since the data preparation apparatus 10 by Example 3 provides the minimum value of an intensity | strength characteristic and determines the ease of removal about a support part, it avoids producing the product which has a support part damaged before removing. Can do.

[Example 4]
The recoater may move during the product manufacturing process, and the support may be damaged. The probability of occurrence of breakage of the support portion varies depending on the moving direction of the recoater. For this reason, when the recoater moves, the data creation device 10 according to the present embodiment reexamines the product and the support portion to re-analyze the stress when the support portion is damaged.

  When it is determined that warpage occurs, the modeling data creation unit 12 determines whether the product and the support unit are not damaged by a shearing force by a recoater by simulation or the like. The modeling data creation unit 12 rotates the product around an axis perpendicular to the moving plane of the recoater when the products are stacked. The modeling data creation unit 12 performs the stress analysis of the product and the support unit again.

Next, processing of the data creation device 10 according to the present embodiment will be described.
Here, the processing flow of the data creation device 10 shown in FIG. 10 will be described.
Here, different from the processing flow shown in FIG. 7, it is determined whether or not the product or the support portion is damaged by the shear force of the recoater, and the product is rotated about the axis perpendicular to the moving plane of the recoater. Will be described.

If it is determined that warpage does not occur (YES in step S5), the modeling data creating unit 12 determines whether the product or the support is not damaged by the shearing force generated by the recoater (step S14).
If the modeling data creation unit 12 determines that the product or the support unit is not damaged by the shearing force of the recoater (YES in step S14), the modeling data creation unit 12 proceeds to the process of step S6.

If the modeling data creation unit 12 determines that the product or the support unit is damaged by the shearing force of the recoater (NO in step S14), the product posture is centered on the axis in the direction perpendicular to the moving plane of the recoater. It rotates so that it may not become the same (step S15).
At this time, the modeling data creation unit 12 may randomly determine an angle around the Z axis. In addition, the modeling data creation unit 12 may preferentially determine the posture in which the support portion is not easily damaged by the shearing force of the recoater, for example, the angle at which the longitudinal direction of the cross section of the support portion becomes the recoater moving direction. Good.
And the modeling data preparation part 12 determines whether a product and a support part are not damaged with the shear force by a recoater (step S16).

  If the modeling data creation unit 12 determines that the product or the support unit is not damaged by the shearing force of the recoater (YES in step S16), the modeling data creation unit 12 proceeds to the process of step S6.

  If the modeling data creation unit 12 determines that the product or the support unit is damaged by the shearing force of the recoater (NO in step S16), the modeling data creation unit 12 returns to the process of step S2.

  Note that the data creation device 10 according to the fourth embodiment may perform the processes of steps S12 and S13 of the data creation device 10 according to the third embodiment illustrated in FIG.

  In the fourth embodiment, the example in which the data creation device 10 determines whether or not the product or the support part is damaged by the shearing force by the recoater is shown. However, the data creation device 10 is the product or the support by the shearing force by the recoater. It is not limited to what determines whether a part is damaged. For example, the data creation device 10 may perform a bending force and a twisting force in addition to the shearing force as in the case of the shearing force.

  The example 4 in the embodiment of the present invention has been described above. In the data creation device 10 according to the fourth embodiment, when the modeling data creation unit 12 determines that warpage occurs, the modeling data creation unit 12 determines whether the product or the support is not damaged by the shearing force of the recoater. The modeling data creation unit 12 rotates the product around an axis perpendicular to the moving plane of the recoater when the products are stacked. The modeling data creation unit 12 determines whether or not the product and the support part are damaged by the shearing force of the recoater without analyzing the stress of the product and the support part when the product is rotated around the Z axis. Try again.

  Thus, since the data creation device 10 according to the fourth embodiment determines whether or not the support portion of the product to be modeled by the three-dimensional laminating apparatus 30 is damaged due to the movement of the recoater, the support portion is damaged before being removed. It is possible to avoid producing a product having

  In the data creation device 10 according to the fourth embodiment, the modeling data creation unit 12 rotates the product around the Z axis. At this time, the apparent Young's modulus of the product does not change. Therefore, when the product is rotated around the Z axis, the modeling data creation unit 12 determines whether or not the product and the support part are damaged by the shear force of the recoater without analyzing the stress of the product and the support part. Can be performed again. That is, the modeling data creation unit 12 can save the analysis time of stress analysis and can eliminate the breakage of the product and the support portion due to the shearing force, bending force, and twisting force by the recoater.

  The instruction unit setting system in FIG. 1 may be referred to as a three-dimensional stacking system.

  Note that the data creation device 10 according to the embodiment of the present invention interpolates desired data by linear interpolation, for example, when each data used for processing is a discrete value and there is no desired value. Processing may be performed using the processed data.

  Note that the processing order of the processing according to the embodiment of the present invention may be changed within a range in which appropriate processing is performed.

  Each of the storage units may be provided anywhere as long as appropriate information is transmitted and received. Each of the storage units may exist in a range in which appropriate information is transmitted and received, and data may be distributed and stored.

  Although the embodiment of the present invention has been described, each of the devices in the data creation device 10 described above may have a computer system therein. The process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

FIG. 11 is a block diagram showing a configuration of an information processing apparatus that implements the data creation apparatus 10 according to the embodiment of the present invention. The data creation device 10 can be realized by using, for example, a general computer 300 which is an information processing device. The computer 300 includes a CPU (Central Processing Unit) 301, a RAM (Random Access Memory) 302, a ROM (Read Only Memory) 303, a storage device 304, an external I / F (Interface) 305, a communication I / F 306, and the like.
The CPU 301 is an arithmetic device that realizes each function of the computer 300 by storing programs and data stored in the ROM 303, the storage device 304, and the like in the RAM 302 and executing processing. A RAM 302 is a volatile memory used as a work area for the CPU 301. The ROM 303 is a non-volatile memory that retains programs and data even when the power is turned off. The storage device 304 is realized by, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), and the like, and stores an OS (Operation System), application programs, various data, and the like.
Each functional unit of the data creation device 10 is realized by the CPU 301 executing a control program stored in the storage device 304, for example.
The external I / F 305 is an interface with an external device. Examples of the external device include a recording medium 307. The computer 300 can read and write to the recording medium 307 via the external I / F 305. The recording medium 307 includes, for example, an optical disk, a magnetic disk, a memory card, a USB (Universal Serial Bus) memory, and the like.
The communication I / F 306 is an interface that connects the computer 300 to a network by wired communication or wireless communication. The bus B is connected to each of the above constituent devices, and transmits and receives various control signals and the like between the control devices.

  The program may realize part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

  Although several embodiments of the present invention have been described, these embodiments are examples and do not limit the scope of the invention. These embodiments may be variously added, omitted, replaced, and changed without departing from the gist of the invention.

  The present invention is applicable to all parts manufactured by a three-dimensional laminating apparatus. For example, it can be applied to gas turbines, turbochargers, compressors, aerospace components, and the like.

DESCRIPTION OF SYMBOLS 10 Data preparation apparatus 11 Product shape creation part 12 Modeling data creation part 13 Reference | standard data creation part 14 Database 20 Network 30 Three-dimensional laminating apparatus 101 Modeling platform 102 Metal frame 103 Uncured powder 104 Lens 105 Recoater 106 Powder 109 Laser beam 110 Modeling thing 300 Computer 301 CPU
302 RAM
303 ROM
304 Storage device 305 External I / F
306 Communication I / F
307 recording medium

Claims (12)

A data creation device for setting a support portion for supporting the product when the product is laminated by a three-dimensional laminating device,
A database that stores a mathematical model that formulates the relationship between the strength characteristics of the support and the warpage prevention stress limit;
An analysis unit for analyzing stress applied to the support unit and the product by a lamination process;
Based on the analysis result of the stress applied to the support part and the product by the analysis part and the mathematical model, the stress of the support part having the strength characteristic that the stress applied to the support part does not exceed the warp prevention stress limit. A support part shape specifying part for specifying the shape;
A data creation device comprising: The support part shape specifying part is
When it is determined that the product is warped based on the analysis result of the stress applied to the support portion, based on the analysis result and the mathematical model, the warpage preventing stress limit is not exceeded. Modify the strength characteristics and identify the shape of the support based on the modified strength characteristics;
The data creation device according to claim 1. A posture changing unit for changing the posture of the product;
A support unit necessity determination unit that determines whether or not the support unit is necessary when the posture change unit changes the posture; and
The support part shape specifying part is
Based on the analysis result and the mathematical model of the stress applied to the support unit and the product, the posture changing unit changing the posture when the support unit is necessary and the support unit necessity determining unit determines Identifying the shape of the support having the strength characteristics corresponding to the warp prevention stress limit;
The data creation device according to claim 1 or 2. The posture changing unit
When the strength characteristic is corrected so that the stress applied to the support part by the support part shape specifying part does not exceed the warp prevention stress limit, the corrected strength characteristic is equal to or higher than the upper limit value of the strength characteristic. , Change the attitude of the product,
The data creation device according to claim 3. The posture changing unit
When the strength characteristic is equal to or lower than the lower limit value of the strength characteristic when the strength characteristic is corrected in a range where the stress applied to the support part by the support part shape specifying part does not exceed the warp prevention stress limit, Change the attitude of the product,
The data creation device according to claim 3 or 4. Whether or not the support part is deformed with the movement of the recoater when the product is rotated around an axis perpendicular to the plane of movement of the recoater when the posture changing unit laminates the product. A deformation determination unit for determining,
The data creation device according to any one of claims 3 to 5, further comprising: A computer for setting the support unit with reference to the database;
The computer
A setting step for setting strength characteristics of the support part;
An analysis step for performing stress analysis on the support and the product;
Based on the stress analysis performed in the analysis step, a calculation step for calculating a stress value of the support part;
Referring to the mathematical model of the database, whether or not warpage occurs in the product or the support unit based on the strength characteristic set in the setting step and the stress value calculated in the calculation step. A first determination step for determining;
When it is determined that warpage occurs in the first determination step, based on the mathematical model of the database, the strength characteristic is corrected within a range not exceeding the warp prevention stress limit, and the corrected strength characteristic is A first correction step of correcting the support portion to a corresponding configuration;
A second determination step for determining that the support portion is difficult to remove when the strength characteristic after setting or correction exceeds a predetermined reference value;
When it is determined in the second determination step that the support portion is difficult to remove, the intensity characteristic is corrected to a range not exceeding the reference value by referring to the mathematical model of the database, and the corrected intensity Performing a second correction step of correcting the support portion in a configuration corresponding to the characteristics;
The data creation device according to any one of claims 1 to 6. The computer
When the support portion is modified, based on the modified support portion, the analysis step, the calculation step, the first determination step, the first correction step, the second determination step, and the first Perform the correction process of 2 again,
The data creation device according to claim 7. The computer
Based on the stress-strain diagram for the support portion of various configurations, a formulation step is performed to formulate the relationship between the strength characteristics of the support portion and the warpage prevention stress limit.
The data creation device according to claim 7 or 8. The data creation device according to any one of claims 1 to 9,
A three-dimensional laminating apparatus for modeling a three-dimensional product based on the modeling data generated by the data creation apparatus;
A three-dimensional stacking system comprising: When a product is laminated by a three-dimensional laminating apparatus, a database for storing a mathematical model that formulates the relationship between the strength characteristics of the support portion supporting the product and the warpage prevention stress limit is provided, and the method for setting the support portion There,
Analyzing the stress applied to the support part and the product by a lamination process;
Based on the analysis result obtained by the analysis and the mathematical model, specifying the shape of the support part having the strength characteristic that the stress applied to the support part does not exceed the warp prevention stress limit;
Setting method including. When laminating products with a three-dimensional laminating apparatus, a computer for setting a support portion for supporting the products,
Storing a mathematical model that formulates the relationship between the strength characteristics of the support and the warp prevention stress limit;
Analyzing the stress applied to the support part and the product by a lamination process;
Based on the analysis result obtained by the analysis and the mathematical model, specifying the shape of the support part having the strength characteristic that the stress applied to the support part does not exceed the warp prevention stress limit;
A program that executes

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