JP4413311B2 - 3D model dividing method and apparatus, and storage medium storing 3D model dividing method program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-dimensional model dividing method and apparatus, and a storage medium storing a program for the three-dimensional model dividing method. More specifically, a sheet metal product modeled on a three-dimensional CAD is composed of a plane. The present invention relates to a method and apparatus for dividing a three-dimensional paper model as a surface model, and a storage medium storing a program for dividing the three-dimensional paper model.
[0002]
[Prior art]
In general, for example, in order to properly process a sheet metal product, a designer looks at a drawing or rough sketch received from an order recipient, reconstructs a three-dimensional product shape in his head, and disassembles it into any unit I was considering.
[0003]
When the product shape of a sheet metal product received from an order recipient is complicated, the designer has created a product shape for examination by pasting paper together.
[0004]
Then, at the stage where the concept of dividing the sheet metal product is almost solidified, the designer sketches the exploded view of each disassembled shape by hand, and uses the automatic programming device to draw the developed view based on the handwritten sketch and the drawing. I was making it.
[0005]
The above-described development drawing creation process is repeated as many times as disassembled to create a predetermined number of development drawings.
[0006]
[Problems to be solved by the invention]
Such a conventional work for the designer to properly disassemble the sheet metal product and create a development view has the following problems.
[0007]
In other words, the designer takes a lot of man-hours to imagine the product shape of the sheet metal product in his head, and for example, to keep the imagined image of simple model creation with paper, etc. There was a problem that it took. In addition, in order for a designer to create a development based on a handwritten sketch and a drawing, considerable manual calculation is required while considering the thickness of the sheet, and there is a problem that a high degree of skill and man-hours are required.
[0008]
In general, the larger the sheet metal product, the more the number of sheet metal products to be disassembled due to restrictions such as the size of the processing machine.As a result, the number of developed drawings increases, which increases the number of steps for creating a developed drawing. It was.
[0009]
The division work process related to a series of sheet metal products related to the above is highly dependent on the skill of the operator such as reading of drawings, disassembling examination, manual calculation necessary for creating a development drawing, etc. There is a problem that it is easy to occur and the detection thereof is the final step of processing such as welding and assembly.
[0010]
Further, when a change in thickness due to a strength problem or a partial structural change occurs on the design side, there has been a problem that the above-described development drawing creation work requiring man-hours is re-executed.
[0011]
[Means for Solving the Problems]
The present invention has been made in view of the above-described problems, and the invention according to claim 1 is a three-dimensional paper model which is a surface model in which a sheet metal product model modeled on a three-dimensional CAD is composed of surfaces. In the dividing method, it is attribute information to be added to the ridge line of the cut portion entered in order to divide the same plane or curved surface into a plurality of planes or curved surfaces, and attribute information to be added to the ridge line of the bent portion. In the information addition step of adding the cut location information and the match location information, which is attribute information to be added to the ridge line of the match location, on the display screen to the ridge line of the three-dimensional paper model, Based on the bending part information, cutting part information, and matching part information added to the ridgeline of the dimensional paper model, The computer that operates by the program is automatically A continuous surface data extracting step for extracting continuous surface data, which is computer data of a continuous surface in a unit in which the surfaces constituting the plurality of three-dimensional paper models are continuous, and a plurality of data extracted in the continuous surface data extracting step With the continuous surface data, the three-dimensional paper model is divided into a plurality of divided three-dimensional paper models. The computer that operates by the program is automatically A divided three-dimensional paper model generation step.
[0012]
In the invention according to claim 2, in the continuous surface extraction step, in order to more appropriately extract a plurality of continuous surfaces, the V-bend information of the ridgeline, the R-bend information of the ridgeline, and the ridgeline, which are the bending location information Cylindrical surfaces connected in tangential plane Or The three-dimensional model dividing method according to claim 1, further comprising: a continuous surface condition setting step of setting a ruled curved surface connected to a ridge line in a continuous tangential plane as a continuous surface condition and extracting a plurality of continuous surfaces.
[0013]
The invention according to claim 3 is directed to the plurality of divided three-dimensional paper models generated in the divided three-dimensional paper model generation step. The computer that operates by the program is automatically A color identification step for color-coding a plurality of the divided three-dimensional paper models; Displaying the plurality of divided three-dimensional paper models color-coded on a display screen so as to be identifiable by color; The method for dividing a three-dimensional model according to claim 1 or 2 including:
[0014]
The invention according to claim 4 divides the three-dimensional model that can trace the time series of the division operation of the three-dimensional paper model to the designated process by holding all the history data for the division operation of the three-dimensional paper model. Is the method.
[0015]
The invention according to claim 5 is a three-dimensional paper model dividing device which is a surface model in which a sheet metal product model modeled on a three-dimensional CAD is composed of surfaces, and a bending portion which is attribute information added to a ridge line of the bending portion. Information, cutting location information that is attribute information added to the ridgeline of the cutting location entered to divide the same plane or curved surface into a plurality of planes or curved surfaces, and matching that is attribute information added to the ridgeline of the matching location Information adding means for adding the location information to the ridgeline of the 3D paper model on the display screen, bending location information added to the ridgeline of the 3D paper model by the information addition means, cutting location information, and Based on the matching location information, The computer that operates by the program is automatically Continuous surface data extracting means for extracting continuous surface data which is computer data of continuous surfaces in a unit in which the surfaces constituting the plurality of three-dimensional paper models are continuous, and a plurality of data extracted by the continuous surface data extracting means With the continuous surface data, the three-dimensional paper model is divided into a plurality of divided three-dimensional paper models. The computer that operates by the program is automatically A three-dimensional model dividing device having divided three-dimensional paper model generation means for generating.
[0016]
The invention according to claim 6 Operate by program A computer-readable storage medium storing a control program for controlling the three-dimensional model dividing apparatus by a computer, the control program being the same as bending point information that is attribute information added to a ridge line of a bending point Cutting location information that is attribute information added to the ridgeline of the cutting location entered to divide the plane or curved surface into a plurality of planes or curved surfaces, and matching location information that is attribute information added to the ridgeline of the matching location, Is added to the ridgeline of the three-dimensional paper model on the display screen, and the bending part information, the cutting part information, and the matching part information added to the ridgeline of the three-dimensional paper model by the information addition program. Based on the planes that compose multiple 3D paper models A continuous surface data extraction program for extracting continuous surface data, which is data data, and a plurality of continuous surface data extracted by the continuous surface data extraction program, thereby dividing a three-dimensional paper model into a plurality of divided three-dimensional paper models A computer-readable storage medium storing a three-dimensional model dividing method, characterized by storing a divided three-dimensional paper model generation program for generating a three-dimensional model.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a three-dimensional model design apparatus 1 according to the present embodiment.
[0018]
The three-dimensional model design apparatus 1 includes, for example, a three-dimensional CAD / CAM unit 3 in which a designer creates a product model based on a development view of a product, and sheet metal model data designed by the three-dimensional CAD / CAM unit 3 / Bending part of a three-dimensional paper model which is a surface model composed of sheet metal model data / paper model data file 5 storing paper model data Mi and surfaces stored in the sheet metal model data / paper model data file 5 Bending point information that is attribute information to be added to the ridge line, cutting point information that is attribute information to be added to the ridge line of the cutting point that is entered to divide the same plane or curved surface into a plurality of planes or curved surfaces, and the matching part An information adding unit 9 for adding the matching part information, which is attribute information to be added to the ridgeline, from the screen display unit 7; Who is what includes a screen control unit 11 for controlling the display of the display screen 7 of adding such the bending point information from the information adding unit 9, a.
[0019]
Further, the three-dimensional model design apparatus 1 includes an application control unit 15. The application control unit 15 links the three-dimensional CAD / CAM unit 3 with the paper model control unit 13 that controls the division of the paper model as a whole. Further, the application control unit 15 reads the 3D CAD / CAM unit 3 and the 3D paper model modeling history data Ri from the history data file 17 and plays back the 3D paper model in time. And link.
[0020]
The paper model control unit 13 divides the three-dimensional paper model into a plurality of components based on the bending portion information, the cutting portion information, and the matching portion information, and each component of the three-dimensional paper model divided into the plurality of pieces. A continuous surface extracting unit 21 for extracting a plurality of continuous surfaces for distinguishing from the other components of the three-dimensional paper model divided into a plurality of components, and a plurality of continuous surfaces extracted by the continuous surface extracting unit 21 A continuous plane data file 23 that stores data Pi, a model dividing unit 25 that generates a plurality of divided paper models by dividing a three-dimensional paper model by a plurality of continuous plane data Pi, and data of the plurality of divided paper models The divided model data file 27 for storing the divided model data Ki and a plurality of divided model data Ki are read, and a plurality of divided pages are read. In order to identify the model, the color is changed for each divided paper model, and the color data adding unit 29 for generating the colored model data Si for adding this data to the divided paper model, and the colored data for storing the colored model data Si A model data file 31.
[0021]
The three-dimensional model design apparatus 1 also reads the divided model data Ki described above from the divided model data file 27 and generates expanded graphic data generation unit 33 that generates expanded graphic data Ti that is graphic data obtained by expanding the divided paper model. And a developed graphic data file 35 for storing the developed graphic data Ti.
[0022]
The developed graphic data Ti is read from the developed graphic data file 35 by the three-dimensional CAD / CAM unit 3 and displayed on the screen display unit 7. The designer looks at the developed view displayed on the screen display unit and examines the model division such as the yield of the sheet metal and whether or not it can be processed. After the above-described division of the three-dimensional paper model is completed, the plate cutting process is performed according to the number of products ordered. NC data is generated from the plate cutting sheet subjected to the plate cutting process, and this NC data is transmitted to the NC processing machine 41 via the communication cable 43. The NC machine obtains the NC data and starts machining.
[0023]
With reference to FIG.2 and FIG.3, the general | schematic flow from the addition of the data to a three-dimensional paper model to sheet metal expansion | deployment is demonstrated.
[0024]
FIG. 2A shows a 3D paper model displayed on the screen display unit 7 of the 3D model design apparatus 1. This 3D paper model is usually modeled by a designer through a CAD / CAM operation operation of the 3D design apparatus 1. For example, in order to reduce the modeling man-hours of the 3D paper model, from the CAD / CAM system of the client. In some cases, a model is generated by loading 3D IGES data, which is data for converting a paper model of a manufactured product, into the 3D model design apparatus 1.
[0025]
In FIG. 2B, attribute information is added to the three-dimensional paper model. For convenience, the surfaces constituting the three-dimensional paper model are labeled from surface A to surface M as shown in FIG. Further, a description will be given with reference numerals attached to the ridgeline where the surfaces intersect.
[0026]
In order to divide the same plane or curved surface into a plurality of planes or curved surfaces with respect to the three-dimensional paper model generated in the three-dimensional design apparatus 1, the bending portion information that is attribute information added to the ridge line of the bending portion that is attribute data Cutting location information, which is attribute information added to the ridgeline of the entered cutting location, and matching location information, which is attribute information added to the ridgeline of the matching location, are added. Here, for the ridgeline to which the above-described information is added, R-bend portion information is added to the ridgeline AB where the surface A and the surface B intersect. The R-bending portion information is added to the ridge line AC where the surface A and the surface C intersect. V bending information is added to the ridge line AM where the surface A and the surface M intersect. V bending information is added to the ridgeline DJ where the surface D and the surface J intersect. V-bend portion information is added to the ridge line EK where the surface E and the surface K intersect. R-bending point information is added to the ridge line HF where the surface H and the surface F intersect. R-bending point information is added to the ridge line HG where the surface H and the surface G intersect. V bending location information is added to the ridge line HL where the surface H and the surface L intersect.
[0027]
A cutting line BD is created between the surface B and the surface D, and cutting location information is added. A cutting line DF is created between the surface F and the surface D, and cutting location information is added. A cutting line CE is created between the surface C and the surface E, and cutting point information is added. A cutting line EG is created between the surface G and the surface E, and cutting location information is added. A cutting line JM is created between the surface J and the surface M, and cutting location information is added. A cutting line JL is created between the surface J and the surface L, and cutting location information is added. A cutting line KM is created between the surface K and the surface M, and cutting location information is added. A cutting line KL is created between the surface K and the surface L, and cutting location information is added. A butt line DM is created between the surface D and the surface M, and butt location information is added. A butt line is created between the surface D and the surface L, and butt location information is added. A butt line EM is created between the surface E and the surface M, and butt location information is added. A butt line EL is created between the surface E and the surface L, and butt location information is added. Butt location information is added to the ridgeline FI where the surface I and the surface F intersect. Butt location information is added to the ridge line HI where the surface I and the surface H intersect. The matching part information is added to the ridge line GI where the surface I and the surface G intersect.
[0028]
As described above, a continuous surface is extracted from the three-dimensional paper model to which the attribute for dividing is added, and a plurality of continuous surfaces are extracted. Based on the extracted plurality of continuous surfaces, a dividing process is performed as shown in FIG. Here, the actual divided model is displayed in a state of being separated in space so that it can be easily imaged, but in reality, it is displayed as a unit on the screen display unit 7. By cutting at the cutting lines BD, JM and cutting lines CE, KM and the butting lines DM, EM to which the attribute for dividing is added, which is the divided paper model, four of the planes A, B, C, and M are obtained. Divided paper model 1 as a divided part having a plane, cutting lines JM, cutting lines JL and BD, DF to which attributes for dividing are added, and planes D and J by cutting at butt lines DM and DL A divided paper model 2 as a divided portion having two surfaces, a cutting line KM, a cutting line KL and cutting lines CE and EG to which an attribute for dividing is added, and a plane E by cutting at the butting lines EM and EL , Divided paper model 3 as a divided portion having two surfaces of K, cutting lines DF, EG and cutting lines JL, KL to which attributes for dividing are added Divided paper model 4 as a divided part having four surfaces of F, H, G, and L by cutting along butt lines DL, EL, FI, HI, and GI, and a butt with attributes to be divided A process is performed on the divided paper model 5 as a divided part having one surface I by cutting along the lines FI, HI, and GI. For example, yellow, blue, white, green, and brown are sequentially attached. It is the one that is colored.
[0029]
Using a function of developing a known three-dimensional divided paper model, a developed view of a plurality of three-dimensional divided paper models is generated as shown in FIG.
[0030]
Since all the history data of the above-described 3D paper model split operation is stored in the history data file 17 and the modeling operation can be traced back to the time designated by the designer, it is possible to change the sheet thickness of the sheet metal. Development drawings and the like can be regenerated without the need for remodeling of the 3D paper model.
[0031]
In addition, the designer can easily identify the divided paper model by the above-described color coding of the model, and the product processing yield and the product processing can be performed by the development drawing of the above-described plurality of divided three-dimensional paper models. It is possible to appropriately examine the division work such as whether or not.
[0032]
Here, the structure of a file in which 3D paper model data, which is data of a paper model modeled by 3D CAD, is stored will be described with reference to FIG.
[0033]
The three-dimensional paper model data is structured hierarchically. That is, it is composed of a plane, a cylindrical surface, a spherical surface, or a surface that is a quadric surface. The surface is composed of ridge lines that constitute the boundary. Furthermore, this ridgeline is composed of points. For the three-dimensional paper model of this embodiment, surface A, surface B, surface C, surface D, surface E, surface F, surface G, surface H, surface I, surface J, surface K, surface L, surface Each face of M is defined. And corresponding to the surface A, each of the ridgeline A1 which is the ridgeline AB shown in FIG. 2B, the ridgeline A2 which is the ridgeline AC, the ridgeline A3 which is the ridgeline AM, and the ridgeline A4 which is a ridgeline which does not intersect with other surfaces A ridge is defined. Corresponding to this ridgeline A1, a start point and a point A12 as the end point indicating the range of the line segment are defined. Although not shown, a start point and a point A22 as the end point indicating the range of the line segment are defined corresponding to the ridge line A2. Corresponding to the ridge line A3, a start point and a point A32 as the end point indicating the range of the line segment are defined. Corresponding to the ridge line A4, a start point and a point A42 as the end point and the end point indicating the range of the line segment are defined.
[0034]
Although not shown in FIG. 4, it corresponds to surface B, surface C, surface D, surface E, surface F, surface G, surface H, surface I, surface J, surface K, surface L, and surface M as well as surface A. Each ridgeline is defined. Here, for example, the ridge line AB which is the ridge line constituting the surface A and the ridge line AB which constitutes the surface B are the same data, but the state in which the ridge line data is stored on each surface is more appropriate in the calculation processing of the program. So all edges are defined corresponding to the face. Then, a start point and an end point indicating the range of the line segment are defined corresponding to the ridge line.
[0035]
When 3D paper model data is handled by an actual computer program, for example, it is stored in a file as a structure defined in C language.
[0036]
FIG. 5 is a flowchart for explaining extraction of continuous surfaces necessary for generating a three-dimensional divided paper model.
[0037]
First, for example, when the 3D paper model division button of the 3D CAD / CAM unit 3 displayed on the screen display unit 7 is selected with a mouse or the like, the application control unit 15 is activated and the paper model control unit 13 is activated. . The paper model control unit 13 reads the data of the three-dimensional paper model modeled by the three-dimensional CAD / CAM unit 3 into a program memory, and includes a continuous surface extraction unit 21, a model division unit 25, and a color data addition unit 29. Start.
[0038]
In the process of step S501, a search is performed for ridge lines that constitute a surface. In the case of the present embodiment, it is assumed that the processing target is alphabetically from the surface A to the surface M. Initially, since the surface A is the target of processing, the ridgeline that constitutes the surface A is searched for the ridgeline A1, the ridgeline A2, the ridgeline A3, and the ridgeline A4.
[0039]
In the process of step S503, it is determined whether the ridge line searched in step S501 meets the continuous surface condition. Here, the continuous surface is a state in which the surfaces constituting the three-dimensional paper model are integrally connected. Specifically, when the V-bending attribute is added to the ridge line between the surfaces, the ridge line between the surfaces is in contact with the ridge line between the surfaces when the R-bending attribute is added to the ridge line between the surfaces. This refers to the case where there are cylindrical surfaces or ruled curved surfaces that are connected in a continuous plane. In the case of the present embodiment, as shown in FIG. 2B, the ridge line between the A surface and the B surface is a continuous surface because the R-bending attribute is added. The ridge line between the A plane and the C plane is a continuous plane because the R-bending attribute is added. The ridge line between the A plane and the M plane is a continuous plane because the V-bending attribute is added.
[0040]
If it is determined in step S503 that the ridge line read in step S501 matches the continuous surface condition, the process proceeds to step S505. If it is determined in step S503 that the edge line read in step S501 does not meet the continuous surface condition, the process proceeds to step S507.
[0041]
In the process of step S505, the connection surfaces are grouped into the same group. For example, the R plane attribute and the V bend attribute satisfying the condition of the continuous plane with the ridge lines included in the plane A are grouped as the same plane as the M plane shared by the added ridge lines. Similarly, the B group and the C plane sharing the ridgeline to which the R-bending attribute is added are grouped as the same plane, and the process returns to step S501.
[0042]
In the process of step S507, it is determined whether or not the processing has been performed for all the constituent ridge lines constituting the surface searched in step S501. If it is determined in step S507 that the processing in step S505 has been performed on all the constituent ridge lines constituting the surface searched in step S501, the process proceeds to step S509. If it is determined in step S507 that the processing in step S505 has not been completed for all the constituent ridge lines constituting the surface searched in step S501, the process returns to step S501.
[0043]
In the process of step S509, it is determined whether or not the processes from step S501 to step S507 have been performed on all the surfaces constituting the sheet metal product. If it is determined in step S509 that all the surfaces have been processed, the process proceeds to step S517. If it is determined in step S509 that all the surfaces have not been processed, the process proceeds to step S511. In the process of step S511, a surface update process is performed.
[0044]
In the process of step S513, it is determined whether there is an affiliation group. If it is determined in step S513 that there is an affiliated group, the process returns to step S501. If it is determined in step S513 that there is no affiliated group, the process proceeds to step S515.
[0045]
In the process of step S515, a group update process is performed to generate divided model data Ki. Thereafter, the process proceeds to step S501.
[0046]
Finally, in the process of step S517, color-coded model data Si is generated by color grouping, and the process ends.
[0047]
The three-dimensional CAD / CAM unit 3 reads the color model data Si generated by the above-described processing and displays it on the screen display unit 7. Further, the developed graphic generation unit 33 reads the divided model data Ki from the divided model data file 27, generates expanded graphic data Ti, and stores it in the developed graphic data file 35. The three-dimensional CAD / CAM unit 3 reads the divided paper model data Ti and displays it on the screen display unit 7.
[0048]
Thus, the designer can perform an appropriate design.
[0049]
Further, when the designer selects the model playback button of the 3D CAD / CAD unit 3 displayed on the screen display unit 7 when the design is changed, the application control unit 15 causes the model playback unit 19 to select the model playback button. Since the 3D paper model can be returned to the specified modeling state by activating, it is possible to respond quickly.
[0050]
FIG. 6 shows a floppy disk as an example of a storage medium FD storing a control program for controlling the above-described three-dimensional model dividing apparatus.
[0051]
The floppy disk is a computer-readable storage medium storing a control program for controlling the three-dimensional model dividing apparatus by a computer, and the control program is a bending information which is attribute information added to the ridgeline of the bending portion. It is location information, cutting location information which is attribute information added to the ridgeline of the cutting location entered to divide the same plane or curved surface into a plurality of planes or curved surfaces, and attribute information added to the ridgeline of the matching location Information to be added to the ridgeline of the 3D paper model on the display screen on the display screen, bending location information added to the ridgeline of the 3D paper model by the information addition program, cutting location information, In addition, based on the matching part information, the surfaces constituting the plurality of three-dimensional paper models are continuous. A continuous surface data extraction program for extracting continuous surface data, which is computer data of a unit of continuous surface, and a plurality of continuous surface data extracted by the continuous surface data extraction program. A computer-readable storage medium storing a three-dimensional model dividing method storing a divided three-dimensional paper model generation program for generating a plurality of divided three-dimensional paper models.
[0052]
【The invention's effect】
In the present invention, the designer can perform processing based on the three-dimensional paper model displayed on the display screen. For this reason, the number of man-hours for a designer to imagine the shape of a three-dimensional product in his / her head and to create and hold this image using, for example, paper of a sheet metal product has been reduced. In addition, the designer decides in what unit the 3D paper model is to be divided, and performs the setting by setting the division part, the bending part, and the matching part for the three-dimensional paper model. Intuitive operation, such as marking the real thing with chalk, has the effect of reducing the number of mistakes because no skill is required.
[0053]
Since the three-dimensional paper model is displayed in different colors according to the division configuration, the visibility is improved, and the examination of the division of the three-dimensional paper model can be performed more appropriately.
[0054]
By holding all the operation histories, the designer can re-create a development drawing or the like flexibly without requiring man-hours for a design change such as a change in sheet thickness of the sheet metal sheet.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a schematic configuration of a three-dimensional model dividing method and apparatus.
FIG. 2 is an explanatory diagram illustrating a flow of dividing a three-dimensional paper model.
FIG. 3 is an explanatory diagram continued from FIG. 2;
FIG. 4 is an explanatory diagram illustrating a data structure of a three-dimensional paper model.
FIG. 5 is a flowchart of a program for extracting a continuous surface.
FIG. 6 is an explanatory diagram of a storage medium.
[Explanation of symbols]
1 3D model design device
3 3D CAD / CAM
5 Sheet metal model data / paper model data file
7 Screen display
9 Information addition part
11 Screen controller
13 Paper model controller
15 Application control unit
17 History data file
19 Model playback section
21 Continuous surface extraction unit
23 Continuous data file
25 Model division
27 Split model data file
29 Color data adding part
31 Colored model data file
33 Development figure data generation part
35 Expanded graphic data file
41 NC processing machine
43 Communication cable

Claims (6)

In a method of dividing a three-dimensional paper model, which is a surface model in which a sheet metal product model modeled on a three-dimensional CAD is composed of surfaces,
Bending location information that is attribute information to be added to the ridgeline of the bending location, and cutting location information that is attribute information to be added to the ridgeline of the cutting location entered to divide the same plane or curved surface into a plurality of planes or curved surfaces, And an information adding step for adding on the display screen the matching part information that is attribute information to be added to the edge of the matching part on the display screen,
A computer that operates according to a program automatically configures a plurality of three-dimensional paper models based on the bending part information, the cutting part information, and the matching part information added to the ridgeline of the three-dimensional paper model in the information adding step; A continuous surface data extraction process for extracting continuous surface data, which is computer data of continuous surfaces in units of continuous surfaces;
A divided three-dimensional paper model automatically generated by a computer operating by a program by dividing the three-dimensional paper model into a plurality of continuous surface data extracted in the continuous surface data extracting step. Generation process;
A method for dividing a three-dimensional model, comprising: In the continuous surface extraction step, in order to more appropriately extract a plurality of continuous surfaces, the bending surface information, that is, the V-bend information of the ridgeline, the R-bend information of the ridgeline, and the cylindrical surface connected to the ridgeline continuously in a tangential plane Or a continuous surface condition setting step of extracting a plurality of continuous surfaces by setting a ruled curved surface connected continuously to a ridge line as a continuous surface condition. Split method. A color classification identifying step in which a computer operating by a program automatically colors the plurality of divided three-dimensional paper models with respect to the plurality of divided three-dimensional paper models generated in the divided three-dimensional paper model generation step;
Displaying the plurality of divided three-dimensional paper models color-coded on a display screen so as to be identifiable by color;
The method for dividing a three-dimensional model according to claim 1 or 2, characterized by comprising:   4. The time series of the three-dimensional paper model dividing operation can be traced back to a specified process by holding all the history data for the three-dimensional paper model dividing operation. Method for dividing the three-dimensional model. In a three-dimensional paper model dividing device, which is a surface model in which a sheet metal product model modeled on a three-dimensional CAD is composed of surfaces,
Bending location information that is attribute information to be added to the ridgeline of the bending location, and cutting location information that is attribute information to be added to the ridgeline of the cutting location entered to divide the same plane or curved surface into a plurality of planes or curved surfaces, And information addition means for adding matching location information, which is attribute information to be added to the ridgeline of the matching location, on the display screen to the ridgeline of the three-dimensional paper model,
A computer that automatically operates a program based on the bending part information, the cutting part information, and the matching part information added to the ridgeline of the three-dimensional paper model by the information adding unit, and that forms a plurality of three-dimensional paper models. Continuous surface data extraction means for extracting continuous surface data that is computer data of continuous surfaces in units of continuous surfaces;
A divided three-dimensional paper model automatically generated by a computer operating by a program by dividing a three-dimensional paper model into a plurality of continuous surface data extracted by the continuous surface data extracting means. Generating means;
A three-dimensional model dividing apparatus characterized by comprising: A computer-readable storage medium storing a control program for controlling the three-dimensional model dividing apparatus by a computer that operates according to the program,
Bending location information that is attribute information to be added to the ridgeline of the bending location, and cutting location information that is attribute information to be added to the ridgeline of the cutting location entered to divide the same plane or curved surface into a plurality of planes or curved surfaces, And an information addition program for adding on the display screen the matching part information that is attribute information to be added to the ridge line of the matching part on the display screen,
Based on the bending part information, the cutting part information, and the matching part information added to the ridgeline of the three-dimensional paper model by the information addition program, the surface constituting the plurality of three-dimensional paper models is a unit of continuous surfaces. A continuous surface data extraction program for extracting continuous surface data that is computer data of a continuous surface;
A divided 3D paper model generation program that generates a plurality of divided 3D paper models by dividing a 3D paper model into a plurality of continuous surface data extracted by the continuous surface data extraction program;
A computer-readable storage medium storing a method for dividing a three-dimensional model, wherein

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