KR101732970B1 - Method and device of processing 3D CAD data - Google Patents

Method and device of processing 3D CAD data Download PDF

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Publication number
KR101732970B1
KR101732970B1 KR1020150175255A KR20150175255A KR101732970B1 KR 101732970 B1 KR101732970 B1 KR 101732970B1 KR 1020150175255 A KR1020150175255 A KR 1020150175255A KR 20150175255 A KR20150175255 A KR 20150175255A KR 101732970 B1 KR101732970 B1 KR 101732970B1
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South Korea
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data processing
printing
tree structure
cad data
file
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KR1020150175255A
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Korean (ko)
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류홍종
주일원
박수완
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(주)솔리드이엔지
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    • G06F17/50—
    • G06F17/3012—
    • G06F17/30327—
    • G06F2217/02—

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  • Architecture (AREA)
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Abstract

Provided is a method for efficiently generating a 3D printing file and assembling a 3D printout. The present invention also provides a 3D CAD data processing apparatus comprising a data processing unit. The data processing unit forms a tree structure by analyzing data of a 3D CAD file, measures figure information of a body which is the lowest node of the tree structure, and writes the 3D printing file by selecting the body arranged in a 3D printing area by using the figure information of the body based on the tree structure.

Description

TECHNICAL FIELD The present invention relates to a 3D CAD data processing method and apparatus,

The present invention relates to a method and apparatus for processing 3D CAD (CAD) data.

Recently, interest in 3D printers has been rapidly increasing, and it has been widely applied to all fields such as industrial and medical fields.

In outputting the target 3D object through the 3D printer, the solid data having the actual shape in the object is output as a 3D printing file.

In this regard, the data in the 3D CAD file defining the 3D object will have an assembly structure. At this time, the body, which is the lowest layer of the assembly structure, constitutes the actual shape, and the data defining the body corresponds to the solid data having the actual shape.

Accordingly, in order to output the 3D object, it is necessary to generate each of the solid data of all the bodies constituting the 3D CAD file as a 3D printing file. As such, in order to output one 3D object, it is troublesome to generate and rearrange the 3D printing file for each solid data and output it.

In addition, even if 3D printing is performed for each body and output, it is not easy to assemble the object after confirming the assembly structure of the object after outputting. That is, there is a difficulty in assembling the 3D CAD files while confirming the priority order of how to assemble each output body.

The present invention has a problem to provide a method for efficiently generating a 3D printing file and assembling a 3D output.

In order to accomplish the above-mentioned object, the present invention provides a 3D CAD file analyzing apparatus for constructing a tree structure by analyzing data of a 3D CAD file and calculating shape information of a body which is the lowest node of the tree structure; And a data processing unit for creating a 3D printing file by selecting a body disposed in the 3D printing area using the shape information of the body based on the tree structure.

Here, the shape information of the body may include a bounding box of the body.

The shape information of the body may further include a center of gravity of the body.

The 3D printing file may include classification tag information associated with a selected body, and the classification tag information may be information on the nodes of the tree structure.

The 3D printing file can be created such that the bodies formed therein are arranged in a model structure.

The data processing unit may create an assembly diagram based on the 3D printing file.

According to another aspect of the present invention, there is provided a 3D CAD data processing apparatus comprising: a 3D CAD data processing unit for analyzing data of a 3D CAD file to construct a tree structure and calculating shape information of a body, which is the lowest node of the tree structure; And creating a 3D printing file by selecting a body disposed in the 3D printing area using the shape information of the body based on the tree structure.

Here, the shape information of the body may include a bounding box of the body.

The shape information of the body may further include a center of gravity of the body.

The 3D printing file may include classification tag information associated with a selected body, and the classification tag information may be information on the nodes of the tree structure.

The 3D printing file can be created such that the bodies formed therein are arranged in a model structure.

The data processing unit may create an assembly diagram based on the 3D printing file.

According to the present invention, it is possible to construct a tree structure by analyzing data of a 3D CAD file, create a 3D printing file capable of implementing 3D modeling of the structure of the model, and provide an assembly diagram of the 3D printing file.

Accordingly, 3D printing file creation and 3D output assembly can be performed easily and efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of a 3D printing system including a 3D CAD data processing system in accordance with an embodiment of the present invention.
2 is a diagram showing an example of a tree structure of 3D CAD data according to an embodiment of the present invention;
3 illustrates an example of a 3D fritted output using a 3D printing file according to an embodiment of the present invention.
4 is a flowchart illustrating a 3D CAD data processing method according to an embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a schematic diagram illustrating a 3D printing system including a 3D CAD data processing system according to an embodiment of the present invention.

Referring to FIG. 1, a 3D printing system 10 according to an embodiment of the present invention may include a 3D CAD data processing apparatus 100 and a 3D printer 200.

The 3D CAD data processing apparatus 100 is a configuration for generating 3D printing data, that is, a 3D printing file, by processing 3D CAD data defining a 3D printing object. In the 3D CAD data processing apparatus 100, A computer which is a device can be used. As used herein, the term " computer " refers to any type of operation processing device capable of computing CAD data, such as a mobile device such as a smart phone or a tablet, as well as a desktop computer or a laptop computer.

The 3D CAD data processing apparatus 100 may include a data processing unit 110 for processing 3D CAD data to generate a 3D printing file. At this time, the data processing unit 110 may be composed of software, but not limited thereto, and may be configured with hardware.

The data processing unit 110 analyzes the 3D CAD data of the output target object to construct a tree data structure layered by assembly, part, and body, and creates a 3D printing file based on the tree structure Can be performed.

Here, FIG. 2 can be referred to for a tree structure of 3D CAD data. 2 is a diagram showing an example of a tree structure of 3D CAD data according to an embodiment of the present invention. 2 illustrates an example in which the tree structure is formed in a matrix form.

Referring to FIG. 2, 3D CAD data is composed of a tree structure layered by an assembly, a part, and a body. The assembly, which is an upper layer, is composed of parts that are lower layers. And a body that is a lower layer. At this time, the body corresponding to the lowest layer of the tree structure is a unit part having an actual shape in the output object, which is defined by solid data.

Meanwhile, the assembly layer may be layered according to the type of the object. As shown in FIG. 2, the subassemblies ASS02 and ASS03 may be configured as a lower layer of the upper assembly ASS01.

In the tree structure, a name based on the hierarchy of the tree structure may be given to each node in consideration of the constituent elements constituting the tree structure, that is, the classification convenience of the nodes. In this regard, as shown in FIG. 2, the name of the corresponding node can be assigned to the item "NAME". For example, the name "ASS01" can be assigned to the node 1, (4,1) may be assigned the corresponding name "BO01 ".

You can also calculate the bounding box of each body (ie, the volume occupied by each body) and the center of mass.

By using the bounding box of each body thus calculated, the body can be optimally arranged in the 3D printing area which can be output in one time in the 3D printer 200.

In this connection, reference can be made to Fig. FIG. 3 is a diagram illustrating an example of a 3D-fritted output using a 3D printing file according to an embodiment of the present invention.

Referring to FIG. 3, in the 3D printing area PA, the bodies BO01 to BO11 are classified and arranged in a tree form based on the tree structure of FIG. 2, which corresponds to a plastic layout.

In this regard, the bodies are classified and arranged in units of parts which are upper nodes to which the bodies belong, and the bodies belonging to the same part are arranged in such a manner as to be connected to each other through branches (BR) They are arranged in a separated form without being connected to each other. For example, BO01 to BO04, which are bodies belonging to the part PA1 located at the node 3,1, are arranged together. Furthermore, the parts are classified and arranged in units of an assembly which is an upper node to which the parts belong.

In order to easily distinguish the structure of the tree structure and improve the assembling convenience, the classification tag (CT) information in which the node number of the tree structure and / or the node name is specified is associated with the body and is included in the 3D printing file, This classification tag CT can be output in association with the corresponding body. Here, the classification tag CT may include a part and / or an assembly tag which is an upper node tag of the body in the tree structure (for example, "ASS02 (2,1)", "PA1 (3,1) .

On the other hand, although not specifically shown, a body tag may also be constructed as the classification tag CT, in which case the body classification tag may be arranged to be displayed on the periphery or surface of the body.

Since the 3D printing file created based on the tree structure as described above places the bodies in the 3D printing area PA capable of printing, it is necessary to calculate the bounding box which is the volume occupied by the body for optimizing the placement of the bodies. Thus, as mentioned above, the calculation for the bounding box for each body of the tree structure is performed.

When the bounding box for the body is calculated, the bodies to be placed in the 3D printing area PA are selected.

At this time, if the total of the bounding boxes of the bodies included in the 3D CAD file is less than the effective printing volume of the 3D printing area PA, the corresponding 3D CAD data can be created as one 3D printing file.

On the other hand, if the total of the bounding boxes of the bodies included in the 3D CAD file is larger than the effective printing volume of the 3D printing area PA, the corresponding 3D CAD data can not be created as one 3D printing file, .

Here, the effective printing volume of the 3D printing area PA is a volume that can be actually printed, which is smaller than the volume of the 3D printing area PA. In this regard, although the entire 3D printing area PA corresponds to an area in which the 3D printer 200 can implement printing, since the bodies must be spaced apart at a predetermined interval, a separation volume is required for them, and a margin volume , And the area occupied by structures that do not constitute objects such as classification tags (CT), branches (BR), and frames (FR) are required. Accordingly, the effective printing volume of the 3D printing area PA becomes smaller than the volume of the 3D printing area PA. Based on the effective printing volume, bodies having a total sum less than or equal to the effective printing volume are selected, 3D printing file is created.

On the other hand, considering the stable arrangement of the body in 3D printing, the arrangement of the bodies in the 3D printing file may be based on the calculated center of gravity of the body.

The data processing unit 110 of the 3D CAD data processing apparatus 100 can create an assembly drawing together with the 3D printing file creation based on the tree structure as described above.

The assembly drawing is a drawing for assembling the printed bodies as a 3D printing file, which can be provided as shown in FIG. At this time, it is preferable that the assembly diagram is provided in 2D, but it is not limited thereto and may be provided in 3D in some cases.

By providing such an assembly diagram, the user can easily assemble the printed body with reference to the assembly diagram, thereby maximizing user convenience.

Hereinafter, a 3D CAD data processing method according to an embodiment of the present invention will be described with reference to FIG.

First, after the 3D CAD data processing apparatus 100 executes the 3D CAD processing application, the data processing unit 110 reads the 3D CAD file (S10).

Next, the data processing unit 110 proceeds to analyze the data structure of the 3D CAD file (S20). This process may include a step S21 of analyzing the data of the 3D CAD file and constructing a tree structure therefor, and a step S22 of calculating the shape information of the lowest layer of the tree structure, that is, the shape of the body which is the lowest node.

Next, the data processing unit 110 proceeds to create a 3D printing file based on the tree structure (S30). This process includes a step S31 of selecting a body placed in the 3D printing area using the shape information of the body and a step S32 of adding the classification tag information based on the tree structure to the 3D printing file for the selected body .

Here, in the body selection step S31, it is preferable to compare the total volume of the bodies formed in the parts with the effective printing volume in the 3D printing area, with the parts as a unit. Based on the comparison result, And whether or not the bodies of the other parts will be selected together. In such a body selection process, for example, a branch and bound algorithm may be used, but the present invention is not limited thereto.

Next, the data processing unit 110 creates an assembly diagram for the 3D printing file (S40).

Through the above-described process, it is possible to create a 3D printing file based on a tree structure and further to create an assembly diagram.

The 3D printing file created as described above is transmitted to the 3D printer and output, and the 3D printed body can be assembled by referring to the assembly drawing.

As described above, according to the present embodiment, a 3D structure file is constructed by analyzing data of a 3D CAD file, and a 3D printing file capable of implementing 3D printing of a model structure is created based on the data. .

Accordingly, 3D printing file creation and 3D output assembly can be performed easily and efficiently.

The embodiment of the present invention described above is an example of the present invention, and variations are possible within the spirit of the present invention. Accordingly, the invention includes modifications of the invention within the scope of the appended claims and equivalents thereof.

10: 3D printing system 100: 3D data processing device
110: data processor 200: 3D printer

Claims (12)

Analyzing data of the 3D CAD file to construct a tree structure and calculating shape information of a body which is the lowest node of the tree structure; A data processing unit for creating a 3D printing file by selecting a plurality of bodies to be printed together and disposed in the 3D printing area using the shape information of the body based on the tree structure,
And a 3D CAD data processing unit.
The method according to claim 1,
The shape information of the body includes a bounding box of the body
3D CAD data processing device.
3. The method of claim 2,
Wherein the shape information of the body further includes a center of gravity of the body
3D CAD data processing device.
The method according to claim 1,
Wherein the 3D printing file includes classification tag information associated with a selected body,
The classification tag information is information on nodes of the tree structure
3D CAD data processing device.
The method according to claim 1,
The 3D printing file is created so that the bodies formed thereon are arranged in a model structure
3D CAD data processing device.
The method according to claim 1,
The data processing unit creates an assembly diagram based on the 3D printing file
3D CAD data processing device.
In the 3D CAD data processing device,
Analyzing data of the 3D CAD file to construct a tree structure and calculating shape information of the body which is the lowest node of the tree structure;
Creating a 3D printing file by selecting a plurality of bodies to be printed together arranged in the 3D printing area using the shape information of the body based on the tree structure;
And a 3D CAD data processing method.
8. The method of claim 7,
The shape information of the body includes a bounding box of the body
How to process 3D CAD data.
9. The method of claim 8,
Wherein the shape information of the body further includes a center of gravity of the body
How to process 3D CAD data.
8. The method of claim 7,
Wherein the 3D printing file includes classification tag information associated with a selected body,
The classification tag information is information on nodes of the tree structure
How to process 3D CAD data.
8. The method of claim 7,
The 3D printing file is created so that the bodies formed thereon are arranged in a model structure
How to process 3D CAD data.
8. The method of claim 7,
In the 3D CAD data processing device, creating an assembly diagram based on the 3D printing file
The 3D CAD data processing method further comprising:
KR1020150175255A 2015-12-09 2015-12-09 Method and device of processing 3D CAD data KR101732970B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3401875A3 (en) * 2017-05-12 2019-01-02 The Boeing Company Method and systems for part geometry extraction
KR20190000452A (en) * 2017-06-23 2019-01-03 주식회사 맥스로텍 Apparatus and method of slicing 3D model
KR102662216B1 (en) 2023-03-08 2024-04-30 서울과학기술대학교 산학협력단 Data generation device and data generation method for 3D printing of triply-periodic minimal surface structure
KR102667895B1 (en) 2023-03-08 2024-05-23 서울과학기술대학교 산학협력단 Data generation device and data generation method for 3D printing of micro-lattice structures

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090174709A1 (en) * 2008-01-08 2009-07-09 Stratasys, Inc. Method for building three-dimensional objects containing embedded inserts

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090174709A1 (en) * 2008-01-08 2009-07-09 Stratasys, Inc. Method for building three-dimensional objects containing embedded inserts

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3401875A3 (en) * 2017-05-12 2019-01-02 The Boeing Company Method and systems for part geometry extraction
KR20190000452A (en) * 2017-06-23 2019-01-03 주식회사 맥스로텍 Apparatus and method of slicing 3D model
KR101947692B1 (en) 2017-06-23 2019-04-29 주식회사 맥스로텍 Apparatus and method of slicing 3D model
KR102662216B1 (en) 2023-03-08 2024-04-30 서울과학기술대학교 산학협력단 Data generation device and data generation method for 3D printing of triply-periodic minimal surface structure
KR102667895B1 (en) 2023-03-08 2024-05-23 서울과학기술대학교 산학협력단 Data generation device and data generation method for 3D printing of micro-lattice structures

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