JP2003345834A - Method of preparing assembly drawing, implementing apparatus therefor and processing program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of improving the efficiency of assembly drawing preparation operation for preparing an assembly drawing from three- dimensional model data. <P>SOLUTION: A method of preparing assembly drawing from the three- dimensional model data includes the steps of: preparing a disassembly drawing in which components are separated by referring to indicated three-dimensional model data; converting components and features whose sizes measured on the disassembly drawing are smaller than specified values to an exaggerated display; and arranging the converted figures on the disassembly drawing. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly drawing creating apparatus for creating an assembly drawing from three-dimensional model data.
In particular, the present invention relates to a technique that is effective when applied to an assembly drawing creating apparatus that performs an assembly drawing creation operation and a correction operation based on the shape characteristics of three-dimensional model data.

[0002]

2. Description of the Related Art Conventionally, when assembling drawings are created from three-dimensional model data, the disassembly direction and movement amount of the three-dimensional model data are automatically determined and disassembled into individual parts, and then dedicated to having assembly drawing creating technology Was completed as an assembly drawing by hand. For example, Japanese Patent Application Laid-Open No. Hei 7-239866 describes an exploded view drawing creating apparatus which can easily create an exploded view of an assembly composed of a plurality of parts. The outline is that means is provided for determining the disassembled state arrangement position of the components constituting the assembly based on the assembly process data indicating the assembly order and the assembly direction of the components and the shape data of the components constituting the assembly. The exploded view is displayed on the display unit in accordance with the arrangement position determined by the means.

[0003]

In the above prior art, 3
Although it is possible to place parts at easy-to-see positions when creating an exploded view from the dimensional model data, all parts
When drawing on a piece of paper at the same display magnification, small parts become difficult to see, multiple parts are displayed consecutively, making it difficult to see, or when connecting to hidden parts or features. There was a problem that the parts and features of the product could not be seen. Further, in the case where the arranged parts and features have the above-mentioned problems, there is a problem that the work of correcting the display can be performed only by a dedicated person having a technique of creating an assembly drawing. An object of the present invention is to solve the above-mentioned problem and to provide a technique capable of improving the efficiency of an assembly drawing creation operation for creating an assembly drawing from three-dimensional model data.

[0004]

SUMMARY OF THE INVENTION The present invention provides an assembling diagram creating apparatus for creating an assembling diagram from three-dimensional model data. To create. In the present invention, when creating an assembly drawing from three-dimensional model data, the designated three-dimensional model data is referred to, and the exaggerated expression is determined based on the actual dimension values when parts and features are projected on the output paper size. Extract the figure of the part that needs to be extracted, draw a drawing that exaggerates the extracted figure, or extract a group of figures in which the same parts and the same feature are consecutively arranged. It is necessary to draw a drawing that abbreviates a part, or to extract a part or feature that is hidden when viewed from the line of sight, and judge whether or not the figure is necessary as an assembly drawing from the constraint relationship with other parts and express it as a hidden line An extracted figure is extracted, and the extracted figure is drawn as a hidden line using a dotted line, a broken line, or the like, thereby creating an assembly drawing. As described above, according to the assembly drawing creating apparatus of the present invention, when creating an assembly drawing from three-dimensional model data, an assembly drawing in which an exaggerated expression, an abbreviated expression, or a hidden line expression is performed for a specific part or feature. Is created, it is possible to improve the efficiency of the assembly drawing creation operation for creating the assembly drawing from the three-dimensional model data.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an assembly drawing creating apparatus for creating an assembly drawing from three-dimensional model data. FIG. 1 is a diagram showing a schematic configuration of an assembly drawing creating apparatus of the present embodiment. As shown in FIG. 1, the assembling diagram creation device 10 of this embodiment includes an exploded view creation processing unit 13.
, Display change processing unit 14, exaggerated display extraction / conversion processing unit 141, abbreviated display extraction / conversion processing unit 142, hidden line display extraction / conversion processing unit 143, and drawing layout processing unit 1.
6.

The exploded view creation processing section 13 is a processing section for creating an exploded view in which components are separated by referring to the designated three-dimensional model data. The display change processing unit 14 controls the operation of the exaggerated display extraction / conversion processing unit 141, the abbreviated display extraction / conversion processing unit 142, or the hidden line display extraction / conversion processing unit 143 when creating the assembly drawing, and exaggerates it. It is a processing unit that executes conversion processing such as display, abbreviated display, or hidden line display.

The exaggerated display extraction / conversion processing unit 141 is a processing unit for converting a part or feature whose actual dimension value on the exploded view is smaller than a predetermined value into exaggerated display. The abbreviated display extraction / conversion processing unit 142 is a processing unit that converts a predetermined number of parts and features having the same constraint relationship in the exploded view into the abbreviated display.

The hidden line display extraction / conversion processing unit 143 is a processing unit for converting a part or feature hidden from the line of sight of the exploded view into a hidden line display. The drawing layout processing unit 16 is a processing unit that arranges the converted graphic on an exploded view and creates an assembly drawing.

The assembling diagram creating apparatus 10 is divided into an exploded view creating processing unit 13, a display change processing unit 14, an exaggerated display extraction and conversion processing unit 141, an abbreviated display extraction and conversion processing unit 142, a hidden line display extraction and conversion processing unit 143, and Drawing layout processing unit 16
It is assumed that a program for functioning as is recorded on a recording medium such as a CD-ROM, stored on a magnetic disk or the like, and then loaded into a memory and executed. The recording medium for recording the program may be a recording medium other than the CD-ROM. Further, the program may be installed from the recording medium to the information processing apparatus and used, or the recording medium may be accessed through a network to use the program.

In this embodiment, a drawing size input unit 11 for receiving and storing an output drawing size of an assembly drawing, for example, A3 size, A4 size, etc., and three-dimensional model data storing three-dimensional model data Parts 12 and 3
An exploded view creation processing unit 13 for creating an exploded view from the dimensional model data;
A display change processing unit 14 for converting into a hidden line display or the like, a minimum length of an element that can be determined on the assembly drawing is stored in the system, and a minimum length storage unit 15 for the element that can be determined is changed by the display change processing unit 14. Drawing layout processing unit 1 that lays out the formed shape features on an output drawing and creates an assembly drawing
6 and assembly drawing data 17 for storing the created assembly drawing. The created assembly drawing may be displayed separately from the storage.

The three-dimensional model data section 12 stores geometric data 121 for storing geometric data of a shape (for example, a line position, a line length, a curvature of a curve, etc.) and feature information (for example, a feature information defined in a three-dimensional model). For example, feature data 122 for storing characteristic shapes such as holes and extrusions, and constraint relationships between three-dimensional model data (for example, concentric circles sharing a center line with a partner component). The relationship is stored from data indicating the relationship, the relationship arranged in parallel with the partner component, the relationship arranged at a specific distance from the partner component, etc.).

FIG. 2 is a flowchart showing a processing procedure of a process for creating an assembly drawing from three-dimensional model data according to the present embodiment. Assembly drawing creation device 10 of the present embodiment
Receives an input of an output paper size such as A3 or A4 from the user (step 201). Next, an instruction of three-dimensional model data as a basis for creating an assembly drawing is received (step 202).

The exploded view creation processing unit 13 reads the designated three-dimensional model data into a memory and creates an exploded view (step 203). In creating an exploded view, 3
The function of the dimensional CAD may be used, or a method as described in the above-mentioned Japanese Patent Application Laid-Open No. 7-239866 may be used.

Next, the display change processing unit 14 extracts a rectangular parallelepiped containing the component for each component based on the geometric data of the three-dimensional model data (step 204). Also,
Data on the constraint relation of the part is extracted (step 20).
5) Acquire a display state indicating whether the part is hidden by other parts in the created exploded view (step 206).

Next, the exaggerated display extraction / conversion processing unit 141
Parts and features to be exaggerated are searched for based on the geometric data of the three-dimensional model data and the actual dimension values when the inclusion cuboid extracted in step 204 is projected on an exploded view (step 207). Then, it is determined whether an object to be exaggerated is searched (step 208). If there is an object to be exaggerated, conversion to exaggerated display is performed based on the constraint relation extracted in step 205 (step 20).
9).

Next, the abbreviated display extraction / conversion processing unit 142
A search is made for parts and features to be abbreviated and displayed from the geometric data of the three-dimensional model data (step 210). Then, it is determined whether there is a target to be abbreviated (step 211), and if there is a target to be abbreviated, conversion to the abbreviated display is performed (step 212).

Next, the hidden line display extraction / conversion processing unit 143
A search is made for parts and features to be displayed as hidden lines from the geometric data of the three-dimensional model data (step 213). Then, it is determined whether or not there is a target to be displayed with a hidden line (step 214). If there is a target to be displayed with a hidden line, conversion to display of a hidden line is performed (step 215). The drawing layout processing unit 16 arranges each figure converted by the display conversion instruction on the drawing (step 216), and outputs assembly drawing data (step 217).

Next, an assembly drawing creating apparatus 1 of the present embodiment
0, details of the exaggerated display component search processing in step 207 and the exaggerated display conversion processing in step 209 will be described.

FIG. 3 is a flowchart showing a processing procedure for searching for a part to be exaggeratedly displayed from the three-dimensional model data according to the present embodiment. The exaggerated display extraction / conversion processing unit 141 of the assembly drawing creation apparatus 10 of the present embodiment projects the three-dimensional model data on the drawing based on the input output drawing size and the included rectangular solid of the entire specified three-dimensional model data. A projection scale is calculated (step 301). next,
The minimum length of the element that can be determined on the assembly drawing is obtained from the system information (step 302). The minimum length of this distinguishable element is a predetermined value predefined in the system.

Next, information on the first component is extracted from a component list indicating information on components contained in the three-dimensional model data (step 303). This part information is
The name of the part, the size of the included rectangular parallelepiped, information on other parts having a constraint relationship, and the like are assumed to have been created from the three-dimensional model data before the exploded view was created.

Next, when the part is displayed in the output drawing size, the size of the part to be displayed according to the projection scale calculated in step 301 is calculated by the actual dimensions on the drawing (step 304). It is determined whether or not the size is smaller than the minimum length of the element that can be determined (step 305).

In this determination, if it is determined that the length is smaller than the minimum length of the discriminable element, the discrimination cannot be made even if it is directly projected on the assembly drawing. Memorize (Step 3
06).

Next, it is determined whether or not there is a part which has not been checked yet (step 307). If there is, information on the next part is obtained from the parts list (step 308), and the process returns to step 304. If all parts have been checked, the search process is terminated.

FIG. 4 is a flowchart showing a processing procedure of a process for exaggerating and displaying components according to the present embodiment. The exaggerated display extraction / conversion processing unit 141 of the assembly drawing creating apparatus 10 of the present embodiment acquires from the three-dimensional model data the information of the component stored as the target of the exaggerated display in the search processing (step 401). Next, the minimum value of the distance to another component is calculated (step 402), and the component is enlarged such that the length of the exaggerated component in the direction of the other component is １ ／ of the distance to the other component. The rate is calculated (step 403). The component is enlarged and displayed by multiplying the data of the target component by the enlargement ratio calculated in step 403 (step 404).

In the above-mentioned exaggeration display processing, the part enlargement ratio is calculated such that the length of the part after exaggeration display in the direction of another part is １ ／ of the distance from the other part. This is to prevent exaggerated parts from overlapping other parts,
When the component to be exaggerated is exaggerated to the minimum length of the element that can be determined, if the display does not overlap with other component displays, the size of the component after exaggerated display can be determined. The exaggerated display may be performed by calculating the component enlargement ratio that is the minimum length of the element.

In the exaggerated display of the assembly drawing creating apparatus 10 of the present embodiment, the exaggerated display of the parts is described as shown in FIGS. 3 and 4, but the same exaggerated display is performed for the feature to which the parts are assembled. May be.

Next, the assembly drawing creating apparatus 1 of the present embodiment
0, the details of the abbreviated display component search processing in step 210 and the abbreviated display conversion processing in step 212 will be described.

FIG. 5 is a flowchart showing a processing procedure for searching for a part to be omitted from the three-dimensional model data according to the present embodiment. The abbreviated display extraction / conversion processing unit 142 of the assembly drawing creating apparatus 10 according to the present embodiment extracts information indicating the constraint relation of the components from the component list and creates a list (step 501).

Next, referring to the created list of the constraint relationships, the number of items having the same constraint relationship is obtained (step 502). For example, when there are a plurality of sets of components having a certain constraint relationship, if the relative positional relationship of the components assembled according to the constraint relationship and the types and sizes of the components to be assembled are equal in each set, the constraint relationship is determined. Are considered to be the same.

Next, it is determined whether or not there are three or more of the obtained same constraint relations (step 503). If three or more identical restraint relationships are found, they are considered to be arranged one-dimensionally, and the first and last ones are determined from their arrangement coordinates. Is determined to be omissible, information on the first and last constrained parts is obtained (step 504), and intermediate parts are stored in the table as targets to be omitted and displayed (step 505). Here, it may be determined that components other than those arranged at a predetermined interval among the components arranged at the beginning and the end can be omitted. Further, when a plurality of parts having the same constraint relationship are arranged in a two-dimensional or three-dimensional manner, it is determined that the middle part can be omitted while leaving the parts arranged at the corner, or the parts are arranged at the corner. It may be determined that components other than those arranged at predetermined intervals among components arranged in the middle of the component can be omitted.

Next, it is determined whether or not there remains a component which has not been checked (step 506). If the component remains, information on the next component is obtained from the component list (step 50).
7) Returning to step 502, when all parts have been checked, the search processing ends.

FIG. 10 is a diagram showing an example of the abbreviated display storage table of the present embodiment. Data for storing abbreviated display information when three or more parts having the same constraint relationship are arranged one-dimensionally and a part other than the first and last parts is abbreviated and displayed.
The table is as shown in FIG.

In this abbreviated display storage table, the name of the first component to be displayed is stored in the display component name 1001, the name of the last component to be displayed is stored in the display component name 1002,
Coordinates of the start and end of the omitted line indicating that the part has been omitted are stored from the start position X1003 of the omitted line to the end position Y1006 of the omitted line, and the type of the omitted line such as a dotted line or a broken line is indicated by the line of the omitted line. The number of parts not to be displayed is stored in a seed 1007, the number of parts not to be displayed is stored in the number of omitted parts 1008, and the names of parts not to be displayed are stored in the omitted part names 1009 to 1010 in a plurality of arrays.

FIG. 11 is a flowchart showing a processing procedure of a process for omitting parts according to the present embodiment. The abbreviated display extraction / conversion processing unit 142 of the assembly drawing creating apparatus 10 of the present embodiment refers to the abbreviated display storage table shown in FIG. 10 (step 1101), and displays the display component names 1001 and 10
Two pieces of information of the part set to 02 are acquired from the three-dimensional model data and displayed as they are at the display position of the exploded view (step 1102). Note that the components set to the display component names 1001 and 1002 may have been already displayed when the exploded view was created, and may be omitted here.

Next, for a plurality of non-displayed parts, part information is similarly obtained from the three-dimensional model data and erased from the positions already displayed in the exploded view (step 11).
03). In this embodiment, since the exploded view is created first, the parts to be abbreviated are deleted here, but the abbreviated display storage table is created before the exploded view is created. Alternatively, the parts to be omitted may not be displayed when the exploded view is created.

Next, an abbreviated line is displayed based on the information of the start position and the end position of the abbreviated line and the line type in the abbreviated display storage table, and the number obtained by adding two display components to the number of the abbreviated components is added. It is displayed at the center of the ellipsis line (step 1104).

In the abbreviated display of the assembly drawing creating apparatus 10 of the present embodiment, the abbreviated display of parts is described as shown in FIGS. 5 and 11, but the abbreviated display of the feature to which the parts are assembled is performed in the same manner. May be.

Next, the assembly drawing creating apparatus 1 of the present embodiment
0, details of the hidden line display component search processing in step 213 and the hidden line display conversion processing in step 215 will be described.

FIG. 6 is a flowchart showing a processing procedure of a process for searching for a part displayed as a hidden line from the three-dimensional model data according to the present embodiment. The hidden line display extraction / conversion processing unit 143 of the assembly drawing creating apparatus 10 of the present embodiment extracts the information of the first component from the component list (Step 60).
1).

Next, information of the first feature included in the extracted component is extracted (step 602).
Then, it is determined whether or not the feature is hidden when viewed from the line of sight (step 603). If the feature is hidden, it is determined whether or not the feature has a constraint relationship (step 604). As a result, when a constraint relationship is given, the information is stored as a target to be displayed as a hidden line (step 605).

Next, it is determined whether or not a feature that has not been checked remains in the features of the component extracted in step 601 (step 606), and if so, information of the next feature is extracted (step 606). 607), and return to step 603.

In step 608, it is determined whether or not a part which has not been checked remains in the parts list of the designated three-dimensional model data, and if so, information of the next part is obtained from the parts list. (Step 609),
Returning to step 602, when all parts have been checked, the search processing ends.

FIG. 12 is a flowchart showing a processing procedure of a process for displaying a component with a hidden line according to the present embodiment. Since the features hidden from the line of sight are not displayed at the time of creating the exploded view according to the present embodiment, only the features indicated by the hidden lines need to be displayed.

The hidden line display extraction / conversion processing unit 143 of the assembly drawing creating apparatus 10 of the present embodiment acquires information of the feature stored as a target of hidden line display in the search processing from the three-dimensional model data (step). 1201). Next, the display position of the feature in the exploded view is calculated from the line-of-sight vector information (step 1202), and the feature is displayed at that position by a broken line or a dotted line (step 1203).

In the hidden line display in the assembly drawing creating apparatus 10 of the present embodiment, the hidden line display of the feature is described as shown in FIGS. 6 and 12, but the parts are hidden when viewed from the line of sight. In such a case, a similar hidden line display may be performed for the component.

Next, the assembly drawing creating apparatus 1 of the present embodiment
A description will be given of a specific example in the case where exaggeration display processing, omission display processing, and hidden line display processing are performed at 0. FIG. 7 is a diagram illustrating an example of the exaggerated display processing according to the present embodiment. In the three-dimensional model data 701 shown in FIG.
And 704 are arranged. Here, when the exploded view 705 is created, the sizes of the screws 703 and 704 are both
If the element length is smaller than the discriminable element length and it is determined that the exaggerated display conversion is to be performed, the minimum value of the distance to another component is calculated to calculate the component enlargement ratio, and the exaggerated screws 703 and 7 are displayed.
An enlarged display is performed as shown in FIG.

FIG. 8 is a diagram showing an example of the abbreviated display processing of this embodiment. In the three-dimensional model data shown in the exploded view 801 of FIG.
Are restricted by the restriction relation 831, and there are a total of six combinations thereof. Since there are three or more identical constraint relationships, information on the constrained features and parts is acquired, and the first combination (the screw 811 and the segment 82
1, constraint relation 831) and the last combination (screw 81)
6 and the section 826, and the constraint relation 836), the middle part of the screw, the section, and the constraint relation are erased, a broken line is drawn in the middle, and a character string of 6 as the number of combinations is drawn to assemble the drawing 803. Output.

FIG. 9 is a diagram showing an example of the hidden line display processing of this embodiment. In the three-dimensional model data 901 in FIG. 9, the connector 903 is attached to the feature 906 on the base 902 by the constraint relationship 904. Feature 90
6, the display of the feature 906 viewed from the line of sight is hidden by the base 902 as shown in the perspective view 905, and the feature 906 is restrained by the connector 903 by the restraint relation 904. 906 is determined to be a hidden line display conversion target, hidden lines are displayed by broken lines, and output as an assembly diagram 907.
Here, the perspective view 905 is a view added for the description of this example, and is not a view created by the assembly drawing creating apparatus 10 of the present embodiment.

Further, the assembly drawing creating apparatus 1 of the present embodiment
In the description of 0, the exaggerated display processing, the abbreviated display processing, and the hidden line display processing are described as separate processing, however, these processings may be performed in combination. At this time, if a part or feature that has been searched as not to be displayed in the abbreviated display processing is also searched for as an object of exaggerated display or hidden line display, the abbreviated display is prioritized, and the part or feature to be omitted is displayed. Exaggeration display or hidden line display is not performed.

As described above, according to the assembly drawing creating apparatus of the present embodiment, when creating an assembly drawing from three-dimensional model data, an exaggerated expression, an abbreviated expression, or a hidden line expression is used for a specific part or feature. Therefore, the efficiency of the assembly drawing creation operation for creating the assembly drawing from the three-dimensional model data can be improved.

[0051]

According to the present invention, when creating an assembly drawing from three-dimensional model data, an assembly drawing in which an exaggerated expression, an abbreviated expression, or a hidden line expression is performed for a specific part or feature is created. It is possible to improve the efficiency of an assembly drawing creation operation for creating an assembly drawing from three-dimensional model data.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of an assembly drawing creating apparatus according to an embodiment.

FIG. 2 is a flowchart illustrating a processing procedure of a process of creating an assembly diagram from three-dimensional model data according to the embodiment.

FIG. 3 is a flowchart illustrating a processing procedure of a process of searching for a part to be exaggeratedly displayed from three-dimensional model data according to the embodiment;

FIG. 4 is a flowchart illustrating a processing procedure of a process of exaggerating parts according to the embodiment;

FIG. 5 is a flowchart illustrating a processing procedure of a process of searching for a part to be omitted from the three-dimensional model data according to the embodiment;

FIG. 6 is a flowchart illustrating a processing procedure of a process of searching for a component displayed as a hidden line from the three-dimensional model data according to the embodiment.

FIG. 7 is a diagram illustrating an example of an exaggerated display process according to the embodiment;

FIG. 8 is a diagram illustrating an example of an abbreviated display process according to the embodiment;

FIG. 9 is a diagram illustrating an example of a hidden line display process according to the embodiment;

FIG. 10 is a diagram illustrating an example of an abbreviated display storage table according to the embodiment;

FIG. 11 is a flowchart illustrating a processing procedure of a process of displaying abbreviated components according to the embodiment;

FIG. 12 is a flowchart illustrating a processing procedure of a process of displaying a component according to the present embodiment with a hidden line.

[Explanation of symbols]

10: assembly drawing creation device, 11: drawing size input unit,
12: three-dimensional model data part, 15: minimum storage length of discriminable elements, 17: assembly drawing data, 121: geometric data, 122: feature data, 123: constraint relation data, 13: exploded view creation processing part, 14 ... Display change processing unit, 141 ... Exaggerated display extraction / conversion processing unit, 142 ... Omitted display extraction / conversion processing unit, 143 ... Hidden line display extraction / conversion processing unit, 16 ... Drawing layout processing unit, 701 ... 3D model data , 702 ... plates, 703 and 704 ... screws,
705: Exploded view, 706: Restricted relation, 707: Assembly view, 801: Exploded view, 802: Plate, 803: Assembled drawing, 811 and 816: Screw, 821 and 826: Intercept, 831 and 836: Restricted relation, 901: 3D model data, 902: base, 903: connector, 904 ...
Constraint relation, 905: perspective view, 906: feature, 9
07: Assembly drawing, 1001 and 1002: Display part name, 1003: Omitted line start position X, 1004 ... Omitted line start position Y, 1005 ... Omitted line end position X, 100
6 ... End position Y of the omitted line, 1007 ... Line type of the omitted line, 1
008: number of omitted parts, 1009 to 1010: names of omitted parts.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takayoshi Soeda             5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Hitachi, Ltd. Software Division F term (reference) 5B046 DA10 FA06 FA16 FA17

Claims (7)

[Claims] 1. An assembly drawing creating method for creating an assembly drawing from three-dimensional model data, comprising the steps of: creating an exploded view in which parts are separated by referring to designated three-dimensional model data; Assembling, comprising the steps of: converting a part or feature whose actual dimension value is smaller than a predetermined value into an exaggerated display; and arranging the converted figure on an exploded view. Diagram creation method. 2. An assembling diagram creating method for creating an assembling diagram from three-dimensional model data, comprising: creating an exploded view in which parts are separated by referring to the designated three-dimensional model data; A step of performing conversion to abbreviated display for a predetermined number of parts and features having the constraint relationship described above, and a step of arranging the converted figure on an exploded view. How to make. 3. An assembling diagram creating method for creating an assembling diagram from three-dimensional model data, comprising the steps of: creating an exploded view in which parts are separated by referring to the designated three-dimensional model data; A step of performing conversion to a hidden line display for a part or a feature hidden from an object, and a step of arranging the converted figure on an exploded view. 4. An assembly drawing creating apparatus for creating an assembly drawing from three-dimensional model data, comprising: an exploded view creation processing unit for creating an exploded view in which parts are separated by referring to the designated three-dimensional model data; A display change processing unit for converting a part or feature whose actual dimension value is smaller than a predetermined value into an exaggerated display,
A drawing layout processing unit for arranging the converted graphic on an exploded view. 5. An assembly drawing creating apparatus for creating an assembly drawing from three-dimensional model data, comprising: an exploded view creation processing unit for creating an exploded view in which parts are separated by referring to the designated three-dimensional model data; A display change processing unit that performs conversion to abbreviated display for a predetermined number of parts and features having the same constraint relationship on the drawing,
A drawing layout processing unit for arranging the converted graphic on an exploded view. 6. An assembly drawing creating apparatus for creating an assembly drawing from three-dimensional model data, comprising: an exploded view creation processing unit for creating an exploded view in which parts are separated by referring to the designated three-dimensional model data; A display change processing unit that converts a part or feature hidden from the line of sight of the drawing into a hidden line display, and a drawing layout processing unit that arranges the converted graphic on an exploded view An assembly drawing creation apparatus characterized by the above-mentioned. 7. A program for causing a computer to function as an assembly drawing creating apparatus for creating an assembly drawing from three-dimensional model data, wherein the program refers to the designated three-dimensional model data and creates an exploded view in which parts are separated. A diagram creation processing unit, a process for converting a part or feature whose actual dimension value on the exploded view is smaller than a predetermined value into an exaggerated display, A display change processing unit that performs a process of performing conversion to abbreviated display for a number of parts or features, or a process of performing a process of performing conversion to hidden line display for components or features that are hidden from the line of sight of the exploded view. A program causing a computer to function as a drawing layout processing unit for arranging the converted graphic on an exploded view.