JPH09326045A - Three-dimensional model generating method, device therefor and storage medium storing program for generating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the arrangement change of an independent model by releasing a restricting condition between parts at need even in the case of a geometrically restricting type three-dimensional CAD. SOLUTION: Concerning a geometrically restricting type computer aided automatic designing system generating a three-dimensional model with the support of a computer to automatically generate linked information such as an application drawing and an inverted model corresponding to the three-dimensional model and generates linked information by automatically changing with the change of the three-dimensional model, at the time of assembling a new second part B to an old first part A constituting the three-dimensional model, a pseudo model the geometric condition of which is independent is prepared corresponding to the assembling surfaces A1 to A3 of the second part A to assemble to the second part B to change an assembling condition in the state of releasing geometric restriction between the pseudo model 60 and the second model B. A first table 38 sets an assembling condition between the first part A and the second part B by geometric restriction. A second table 40 sets the assembling condition between the pseudo model 60 and the second part B released from geometric restriction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a parametric feature-based CAD that generates a three-dimensional model with the support of a computer and automatically generates cooperation information such as an application drawing and an inverse model when the three-dimensional model is changed. The present invention relates to a known geometric constraint type three-dimensional model generation method and apparatus, and a storage medium storing a program for generating a three-dimensional model.

[0002]

2. Description of the Related Art A geometric constraint type three-dimensional CAD conventionally known as a parametric feature-based CAD.
Creates a product model by assembling a plurality of single component models. Also regarding the component model,
A single component model is generated by dividing the plurality of portions and generating them and then combining them.

In generating such a product model or a part model, a parametric featurer-based CA is used.
D has an automatic cooperation function of automatically creating, for example, a drawing necessary for machining using the created model, and, in the case of a mold component, automatically creating an inverse model for mold design. Therefore, when one product model is designed, a series of drawings required from its processing to assembly can be automatically created by the automatic cooperation function.

On the other hand, there is a geometrically unconstrained three-dimensional CAD known as a non-parametric feature-based CAD. In the non-parametric feature-based CAD, independence between individual models is maintained, and even in an assembly model or the like, the constraint between existing models is loose, so that there is a degree of freedom regarding changes. However, there is no automatic linking function between application models and models that automatically generate drawings based on the created models from processing to assembly. For this reason, the generation of the application model and the drawing is handled as a different dimension from the model generation, and it is difficult to realize so-called design-to-design, consistent data cooperation operation from design to manufacturing.

[0005]

However, such a conventional parametric feature-based CA is used.
In the geometrically constrained three-dimensional CAD known as D, for example, when a plurality of single component models are combined to create a product model, a new component to be newly incorporated and an existing component that already exists exist. When the assembly condition is set and the assembly condition is changed after the assembly, for example, due to a design change on the existing part side, the logical consistency between the new part and the existing part is broken due to the geometric constraint condition, There are problems such as being unable to change the design, and taking time to set the conditions between new parts and existing parts again.

That is, in the arrangement relationship between the already-arranged existing part and the next-placed new part, when the arrangement conditions of both are obtained from the already-arranged existing part, the arrangement condition is geometrically constrained. After that, when the existing parts are changed, if there is a contradiction in the consistency of the geometric constraint conditions, the change cannot be made, and even if it is forced, there is a risk that the system will be down.

As described above, since the parametric feature-based CAD is geometrically constrained, it can be automatically edited and has the convenience of preventing omission of changes. However, the parametric feature-based CAD must be changed after being aware of inconsistencies in matching conditions. If this is not the case, the constraint may be inconvenient. The present invention has been made in view of such problems, and even in the case of the geometric constraint type three-dimensional CAD, the constraint condition between the parts is released as necessary, and the layout change of the independent model can be easily performed. An object of the present invention is to provide a three-dimensional model generation method and device capable of performing the above, and a storage medium storing a program for generating a three-dimensional model.

[0008]

FIG. 1 is a diagram illustrating the principle of the present invention. First, the present invention generates a three-dimensional model with the support of a computer, and automatically generates cooperation information such as an application drawing and an inverse model corresponding to the generated three-dimensional model,
The present invention is directed to a three-dimensional model generation method using a geometric constraint type computer aided automatic design system that automatically changes and generates the cooperation information in accordance with the change of the three-dimensional model.

In the present invention as such a three-dimensional model creating method, as shown in FIGS. 1A and 1B, a first part A, which is an existing part of the three-dimensional model, is replaced by a new part or the like. When assembling the two parts B, a pseudo model 60 with independent geometric conditions is created corresponding to the assembling surfaces A1, A2, A3 of the first part A to which the second part B is assembled, and the pseudo model 6
The assembly condition is changed between 0 and the second part B.

Specifically, it has the following procedure. When assembling the second part B such as a new part to the existing first part A that constitutes the three-dimensional model, both parts are assembled using the first coordinate system (s, t, u) of the three-dimensional model. A first table creating step of creating a first table 38 in which geometrical conditions necessary for assembly are set; a pseudo model 60 corresponding to an assembly surface of the first part A,
Pseudo model creation process created by the second coordinate system (X, Y, Z) independent of the first coordinate system (s, t, u); Pseudo model 60 using the second coordinate system (X, Y, Z) The second table 40 in which the geometric conditions necessary for the assembly of the second part B with respect to
The second according to the change of the assembly condition of the part A (position change etc.)
Second table creation process of updating the table 60; table inverse conversion process of performing inverse conversion to the installation conditions of the first table 38 and storing each time the installation conditions of the second table 40 are changed in the second table creation process The step of creating the first table is at least the first part A
The offset value and the surface contact condition of the assembly position of the second part B with respect to are set, and the offset value and the surface contact condition of the first table 38 are set in the second coordinate system (X, Y, Z) are converted into dimensions from the origin 0 ₂ and stored in the second table 38.

In the process of creating the pseudo model, it is desirable that the pseudo model 60 having a standard shape is created in advance and made into a library, and the pseudo model 60 made into the library is selected as necessary. Further, the pseudo model 60 can be selectively displayed during the modeling work of the parts assembly.
Further, there is provided a table output process for displaying or printing a list of the assembling conditions of the first table 38 and the second table 40 based on the output request according to the output request.

When modeling the parts assembly, the first part A, the pseudo model 60, and the second part B are used for the parts using the pseudo model 60 on the display screen of the three-dimensional model to be installed. Are displayed in different colors so that they can be identified, and the assembling conditions set in the first table 38 and the second table 40 are displayed. Further, the present invention generates a three-dimensional model with the support of a computer, automatically generates cooperation information such as an application drawing and an inverse model corresponding to the generated three-dimensional model, and changes the cooperation information with the change of the three-dimensional model. Provided is a geometric constraint type three-dimensional model generation device using a computer-aided automatic design system for automatically changing and generating.

The three-dimensional model generating apparatus of the present invention is shown in FIG.
As shown in (C), when the second part B such as a new part is assembled to the existing first part A that constitutes the three-dimensional model, the first coordinate system (s, t, u) is used to create the first table 38 in which the geometric conditions necessary for the assembly between the two parts are set, and the first table creating section 34, the first part A
The pseudo model 60 corresponding to the mounting surface of the first coordinate system
(s, t, u) independent of the second coordinate system (X, Y, Z) to create the pseudo model creation unit 42, the second coordinate system (X, Y, Z) to the second for the pseudo model 60 A second table 40 in which geometrical conditions necessary for assembling the part B are set is created, and the second table 40 is set according to a change (position change, etc.) in the assembling condition of the second part A with respect to the pseudo model 40. The second table creation unit 36 to be updated, and the second table creation unit 36
Every time the assembly condition of the second table 40 is changed by
A table reverse conversion unit 44 that reversely converts the data into the assembling conditions of the table 38 and stores the table is provided.

Further, according to the present invention, a three-dimensional model is generated with the aid of a computer, and cooperation information such as an application drawing and an inverse model corresponding to the generated three-dimensional model is automatically generated to change the three-dimensional model. Accordingly, there is provided a storage medium storing a program for generating a geometric constraint type three-dimensional model using a computer-aided automatic design system that automatically changes and generates cooperation information.

The storage medium storing the program for generating a three-dimensional model according to the present invention is new to the existing first part A which functions as a program and constitutes a three-dimensional model, as shown in FIG. 1C. When assembling the second part B such as a part, the geometrical conditions necessary for the assembling between the two parts are set using the first coordinate system (s, t, u) of the three-dimensional model. 1
First table creating unit 34 for creating table 38, first
The pseudo model creation unit 42 that creates the pseudo model 60 corresponding to the assembly surface of the part A by the second coordinate system (X, Y, Z) independent of the first coordinate system (s, t, u), the second Using the coordinate system (X, Y, Z), the second table 40 in which the geometric conditions necessary for assembling the second part B to the pseudo model 60 are set is created, and the second part A to the pseudo model 40 is set. A second table creating unit 36 that updates the second table 40 according to a change in the assembling condition (position change, etc.), and each time the assembling condition of the second table 40 is changed by the second table creating unit 36,
A table reverse conversion unit 44 that reversely converts the assembly conditions of the first table 38 and stores the table is provided.

The details of the storage medium storing the program for generating the three-dimensional model of the present invention are basically the same as those of the three-dimensional model generating method. According to such a three-dimensional model generation method and apparatus of the present invention and a storage medium storing a program for generating a three-dimensional model, the geometric constraint may be applied depending on the situation while the convenience of the three-dimensional model generation by the geometric constraint type is utilized. It can be released and freely changed, and then it can be returned to the constrained type again, the change work that was difficult in the past can be smoothly performed, and the work efficiency of three-dimensional modeling is dramatically improved.

[0017]

FIG. 2 is a system block diagram of a geometrically constrained three-dimensional CAD system to which the three-dimensional model generation method of the present invention is applied, a so-called parametric feature-based CAD system. In FIG. 2, the three-dimensional model generation system targeted by the present invention includes a geometric constraint type processing unit 10 and a geometric non-constraint type processing unit 12.
The geometric constraint processing unit 10 is the same parametric feature-based three-dimensional CAD system as the conventional one, and includes a three-dimensional CAD application executing unit 14, a database 16 storing a three-dimensional model 18, and an external interface 20.

An input device 22 such as a keyboard and a mouse, a display device 24 using a CRT display, and a printer 25 are connected to the external interface 20. In the present invention, the geometrically unconstrained processing unit 12 is further connected to the geometrically unconstrained processing unit 12 through the external interface 20. The non-geometrically constrained processing unit 12 has an interrupt control unit 26, and with respect to the bus 28 from the interrupt control unit 26, a component pseudo model database 30, an assembly pseudo model database 32, a first table creation unit 34, a 2 table creation unit 36, pseudo model creation unit 4
2, a table reverse conversion unit 44, a first table 38, a second table 40, and a database rewriting control unit 46 are provided.

FIG. 3 is a diagram showing an existing part (first part) which constitutes a prepared three-dimensional model 18 stored in the database 16 provided by the three-dimensional CAD application execution part 14 of the geometric constraint type processing part 10 of FIG. On the other hand, an example of the assembling conditions for making a change by assembling a new component (second component) is shown. Assembling conditions of this part model include face-to-face mating for matching faces of the part model,
Gap face-to-face gaps to match faces MATE-
A large number of assembly conditions such as OFFSET, ALIGN for aligning surfaces with each other, ALIGN-OFFSET for aligning surfaces with an interval, and hole insertion INSERT used when parts are inserted into holes are prepared.

These assembling conditions are actually prepared as function commands, and in actual operation, these function commands are used alone or in combination to constrain the assembling conditions between parts. FIG. 4 is an example of a part assembling process performed by the three-dimensional CAD application executing unit 14 of the geometric constraint type processing unit 10 of FIG. 2, in the case where a new part B is assembled to the existing part A to change the three-dimensional model. Is taken as an example. Since the existing part A is a part that is an assembly source, it can be called a basic part.

For the existing part A as the basic part,
The new part B is assembled as shown in FIG. 5, for example. That is, the face B1 of the new component B is face-aligned with the face A1 of the existing component A at a constant interval, the face B2 of the new component B is face-aligned with a part of the face A2 of the existing component A, and the existing component The surface B3 of the new part B is aligned with the surface A3 of A. FIG. 6 shows an assembling condition according to the face-to-face matching by the geometric constraint type processing unit 10 of FIG. 3 in the assembling state of FIG. First, the surface A of the existing part A
1 and the surface B1 of the new part B define the clearance surface alignment condition 50 in which the interval of the offset value f1 is set. For the surface A2 of the existing part A and the surface B2 of the new part B, the face-to-face matching condition 48-1 having no gap is defined. Similarly, for the surface A3 of the existing part A and the surface B3 of the new part B, the face-to-face condition 48-2 with the interval of 0 is defined.

With respect to the assembling conditions of the existing part A and the new part B in the geometric constraint type processing unit 10, the geometric unconstrained type processing unit 12 of FIG. A pseudo model 60 corresponding to the mounting surface of the new part B with respect to the existing part A is created. FIG. 7 is an assembly surface of the existing model A shown by a broken line, that is, the existing part A shown in FIG.
The pseudo model 60 created corresponding to the assembling surfaces A1, A2 and A3 of FIG. As shown in FIG. 7B, the pseudo model 60 has mounting surfaces A1 and A of the existing model A.
2 and A3 corresponding to the pseudo mounting surfaces 60-1, 60-2,
I have 60-3.

FIG. 8 shows the pseudo model 60 shown in FIG.
3 is an explanatory diagram of a coordinate system of an existing part A. FIG. First, the existing part A and the new part B, which compose the three-dimensional model 18 created by the geometric constraint type processing unit 10 in FIG. 2, both have a three-dimensional relative coordinate system (s, t, u) having an origin O1. Exists in. On the other hand, the pseudo model 60 generated corresponding to the mounting surface of the existing part A has, for example, an absolute coordinate system (X,
Y, Z).

In the present invention, the absolute coordinate system (X, Y, Z) different from the coordinate system (s, t, u) of the existing part A is used.
The existing model processed by the geometric constraint type processing unit 10 by generating the pseudo model 60 of No. 2 and setting the assembly condition with the new part B using the pseudo model 60 as the mounting surface instead of the existing part A. The assembling of the new part B with respect to the part A is released from the constraint condition with respect to the existing part A, and the independent arrangement change of the new part B not constrained by the existing part A is possible.

The assembling conditions among the existing part A, the pseudo model 60, and the new part B are as follows. The first table creating section 3 in the geometric unconstrained processing section 12 in FIG.
4. The pseudo model creation unit 42 and the second table creation unit 36 basically perform this. When the first table creating unit 34 receives from the interrupt control unit 26 an interrupt request for an assembly process by creating a pseudo model from the geometric constraint processing unit 10, the geometric constraint processing unit 10 having the origin O1 in FIG. The first table 38 in which the constraint-type assembling conditions in the relative coordinate system (s, t, u) are set is created.

Since the assembling conditions in this relative coordinate system (s, t, u) are as shown in bell 8, for example, FIG.
The first table 38 having the contents of is created. That is, the first
The table sets the assembling conditions between the existing part A and the new part B. This assembling condition is the setting of the offset value f1 from the surface A1 of the existing component A, the contact setting with the surface A2 of the existing component A, and the face matching with the surface A3 of the existing component A.

Referring again to FIG. 2, when the first table 38 in which the assembling conditions between the existing part A and the new part B are set by the first table creating section 32 is completed, the pseudo model is created next. The parts 42 are the mounting surfaces A1, A of the existing part A.
2, based on A3, as shown in FIG.
Create 0. The pseudo model 60 created by the pseudo model creating unit 42 is given to the second table creating unit 36.
The second table creation unit 36 uses the created pseudo model 60.
The assembling conditions between the new component B and the new component B are set in the three-dimensional absolute coordinate system (X, Y, Z) shown in FIG.

FIG. 9 shows an existing part A in the relative coordinate system (s, t, u) and the absolute coordinate system (X, Y, Z) when the second table 40 is created by the second table creating section 36, and a pseudo component. The model 60 and the new part B are represented by the st coordinate plane and the XY coordinate plane. Note that, in FIG. 9, the assembly state of the pseudo model 60 and the new component B is illustrated separately from the existing component A for easy understanding of the description.

The second table creating section 36 creates the assembling conditions of the pseudo model 60 and the new part 13 in the absolute coordinate system (X, Y, Z) having the origin O2 and creates the second table 40.
To be stored. Specifically, the value of the assembling condition of the first table 38 shown in FIG. 10 is replaced with the dimension from the absolute origin O2 of the absolute coordinate system (X, Y, Z). That is, the offset f1 of the first table 38 is converted into the offset F1 from the absolute origin O2, the contact contact of the surface A2 of the existing component A is replaced with the dimension P2 from the absolute origin O2, and the surface A3 of the existing component A is further added. Is the dimension P from the absolute origin O2.
Is replaced by 1.

Further, a display device 24 such as a CRT display
At the time of actual assembly work using, as shown in Fig. 9,
It is desirable to separate the new part B and the pseudo model 60 to be assembled into the existing part A and display them in different colors. In this case, as shown in the figure, the existing part A is displayed on the display screen.
There is a gap between the new component B and the pseudo model 60, but under actual assembly conditions, the distances D1, D2, D3 between the existing component A and the pseudo model 60 are 0, respectively. Offset F, dimension P1, of the second table
P2 is set.

In the case of the actual modeling work in which the new part B is assembled to the existing part A, the operator uses the pseudo model 60.
The position changing operation for assembling the new component B is directly performed on the existing component A on the display screen without paying attention to. However, as a device, the change of the position of the new part B is realized as a change of the assembly condition for the pseudo model 60 created for the absolute coordinate system different from the existing part A, and the relative coordinate system (s, t, u) is changed. There is no constraint on the existing assembly condition of the existing part A.

The shape of the pseudo model 60 when the new part B is mounted on the existing model A is basically the same as the mounting surface of the existing model. However, when the assembly surface of the existing part A is a curved surface, the curved surface is replaced with a straight plane to create a pseudo model. It is normal to use a straight plane instead of a curved surface as the reference plane for dimensioning,
There is no particular problem if the surface of the pseudo model corresponding to the plane of the assembling surface of the existing model is a straight plane.

Referring again to FIG. 2, after the second table 40 is created by the second table creating section 36, the second table 40 for setting the first new part assembly condition for the pseudo model 60 is created.
If the operator performs an input operation by the input device 22 for changing the mounting position of the new component B on the display device 24, the change information of the mounting position of the new component B is notified via the interrupt control unit 26. The second table creating unit 36 changes the dimensions of the mounting position of the new part B with respect to the pseudo model 60 with respect to the second table 40, and updates the table contents.

In this way, if there is a change in the assembling condition of the new part B with respect to the pseudo model 60 in the second table 40, the table inverse conversion unit 4 is changed after the change of the second table 40.
4 operates and reflects the changed assembling conditions of the second table 40 in the first table 38. That is, the offset F, which is the dimension from the absolute origin O2 of the second table 40 in FIG. 10, and the values after the dimensions P1 and P2 are changed, are used as the existing parts A in the relative coordinate system (s, t, u) of the relative origin O1. The offset value f1 of the new part B with respect to, the contact contact, and the face conversion are inversely converted, and the first table 38 is updated.

Existing part A using such a pseudo model
When the assembling work for changing the assembling position of the new part B is completed, the database rewriting controller 46 receives an interrupt notification to the interrupt controller 26 based on the assembly completion input by the input device 22. Starts up and the first table 3
The setting content of the assembling condition of the new part B to the existing part A generated in 8 is set in the three-dimensional CA of the geometric constraint type processing unit 10.
The data is transferred to the D application execution unit 14, and the three-dimensional model 18 of the database 16 is updated to the contents after the parts are assembled.

The assembly pseudo model database 32 provided in the geometric unconstrained processing section 12 of FIG. 2 stores a pseudo model used for setting assembly conditions with the new part B on the database 16 side. It is created in advance based on the assembling surface of the component model forming the three-dimensional model 18 and stored as library information. By storing such an assembling pseudo model as library information in the assembling pseudo model database 32, the pseudo model creating unit 42 requests the geometric constraint processing unit 10 to perform a component assembling process using the pseudo model. If there is, a pseudo model used for creating the second table 40 can be selected by searching the assembly pseudo model database 32 based on the designation information of the assembly surface of the existing model to be assembled. .

Therefore, the processing can be simplified as compared with the case where the pseudo model is generated by calculation based on the assembling surface of the existing model. The geometric non-constraint type processing unit 12 is similar to the process of dividing a single part into a plurality of parts and constructing one part model by assembling, in addition to the process of assembling a plurality of part models. Is done. A component pseudo model database 30 is provided to generate a pseudo model when the assembly process is performed by dividing this one component into a plurality of parts.

In the part pseudo model database 30, pseudo models generated in advance corresponding to the mounting surfaces of the divided part models that make up each part model stored in the database 16 on the geometric constraint type processing unit 10 side are stored. It is stored in advance as library information. Therefore, even when one part is created by assembling a plurality of divided part models, the change of the assembling position of the new divided part with respect to the pseudo model is released from the assembling condition of the geometric constraint type processing unit 10 in the same manner. You can do it freely in the state you did.

FIG. 11 shows the geometric unconstrained processing unit 12 of FIG.
5 is a flowchart of a process of assembling a new part with respect to an existing part using the pseudo model in FIG. In FIG. 11, first, in step S1, a pseudo model selection menu is displayed in, for example, a menu field of a peripheral frame of a work screen used for a normal modeling operation on the CRT display which is the display device 24. When an assembling process using a pseudo model is required in such modeling work, when the pseudo model selection menu is selected by mouse click or the like, it is determined in step S2 that the pseudo model is selected, and as shown in FIG. The geometric unconstrained processing unit 12 is started.

Subsequently, in step S3, it is checked whether the assembling process using the pseudo model is a component assembly or a divided component constituting one component. If parts assembly, step S4
In step S5, the parts assembly process using the pseudo model is performed, and this process is repeated in step S5 until the continuation is completed. On the other hand, in the case of the divided parts, the assembling process of the divided parts using the pseudo model is executed in step S6, and this is repeated until the continuation is completed in step S7.

FIG. 12 is a flowchart of the parts assembling process using the pseudo model in step S4 of FIG.
In FIG. 12, when the pseudo model assembling process is started,
First, in step S1, modeling information of an existing part to be assembled is loaded, and subsequently, a new assembly component is loaded in step S2. The new part captured in step S2 may be an existing part already created and stored in the database 16, or may be a part model newly created by modeling work.

Subsequently, in step S3, the first table 38 in which the assembling conditions of the existing parts and the new parts are set based on the acquired existing parts and new parts. Then, in step S4, the pseudo model 60 is created based on the mounting surface of the existing part. In the case of FIG. 2, a corresponding pseudo model is read by searching the assembly pseudo model database 32 based on the information of the mounting surface of the existing part and used.

Then, in step S5, the second table 40 is created by setting the assembling conditions of the new part to the pseudo model. Succeedingly, in a step S6, it is checked whether or not the pseudo model display is designated. In the embodiment of the present invention, the menu field of the modeling work screen is provided with a selection menu for designating the presence / absence of the display of the pseudo model, and when the new part is assembled to the existing part, the pseudo model is displayed and the operator Can be made aware of the existence of the pseudo model.

If it is determined in step S6 that the pseudo model display has been designated, the process proceeds to step S7, and the existing parts, the pseudo model, and the new part are displayed in different colors. This allows the operator to recognize the mounting position of the new part using the pseudo model and the mounting position of the new part not using the pseudo model on the work screen. Of course, step S
If the pseudo model display is not specified in 6, the same work screen as the normal modeling work is displayed.

Subsequently, in step S8, it is checked whether or not the assembly condition of the new part model is changed. If the operator changes the mounting position of the new part, it is determined that the new model mounting condition has been changed, and step S9 is performed.
Then, the assembling condition of the new part for the pseudo model in the second table is changed in response to the change input. When the change of the second table is completed, in step S10, an inverse transformation is performed in which the changing condition of the absolute coordinate system in the second table is coordinate-converted into the assembling condition of the relative coordinate system in which normal modeling is performed. The contents of the table are updated. The processes of steps S8 to S10 are repeated until it is determined in step S11 that the parts assembly is completed, and the process returns to the main routine of FIG.

The process of assembling the divided parts using the pseudo model in step S6 of FIG. 11 is also the process of assembling the parts except that the existing parts of FIG. 12 are the existing divided parts and the new parts are the new divided parts. Is the same. Here, with regard to the processing timing by the geometric constraint type processing unit 10 and the geometric non-constraint type processing unit 12 of FIG.

The unconstrained process is designated before the work of assembling the parts in which the pseudo model is considered necessary, and the designation is canceled when it becomes unnecessary. After performing the constraining type assembly work, the non-constraining type processing is designated for the parts that require the non-constraining type processing, and the non-constraining type assembling information, that is, the first table 38 and the second table. Create 40.

At the start of the assembling work, the non-constraint type process is designated to generate a double table of the first table 38 and the second table 40, and is released at the end of the assembling work. Since it is expected that the double table created by creating the first table 38 and the second table 40 will increase the data amount and affect the processing time such as the response deterioration, the editing work such as the parts assembly is completed. When the dual table is no longer required, the unconstrained processing of all or specified parts is canceled to eliminate the redundant table information.

Of course, other than this, it is possible to switch between the constrained type processing and the non-constrained type processing at an appropriate timing. On the other hand, in the non-constraint type processing by creating the pseudo model according to the present invention, the MA used for ordinary constrained type modeling by giving the constrained type assembling form to the pseudo model.
It has an advantage that the assembling conditions (assembling function) such as TE, MATE-OFFSET, and INSERT can be used as they are. On the other hand, a method of creating a second table in which elements such as surfaces, edges, and axes of a new part to be assembled to an existing part are directly recorded in an absolute coordinate system without using a pseudo model may be considered.

However, when the pseudo model is not used, the table structure becomes extremely complicated when a new part itself to be assembled needs to be changed or when a plurality of parts are assembled to an existing part. In this respect, the assembling process of the present invention using the pseudo model can be said to be optimal. In the above embodiment, the unconstrained type process using a pseudo model when assembling a new part to an existing part is taken as an example. Even when you want to change the position, by using one existing part as a basic part and the other existing part as a new part in the same way, by using the pseudo model,
It is also possible to release the constraint conditions and freely change the positions of existing parts.

[0051]

As described above, according to the present invention, it is possible to generate a three-dimensional model that incorporates the advantages of the unconstrained type without losing the characteristics of the geometrically constrained three-dimensional model creation. It becomes possible to smoothly perform the change work such as the parts assembly and the combination of the divided parts, which is difficult with the geometric constraint type, and the efficiency of the three-dimensional modeling work can be dramatically improved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram of a system configuration according to the present invention.

FIG. 3 is an explanatory diagram of an assembling condition in the geometric constraint type processing unit of FIG.

FIG. 4 is an explanatory view of the assembling of existing parts and new parts to be processed by the present invention.

5 is an explanatory view of the assembled state of FIG.

6 is an explanatory view of an assembly condition for setting the assembly of FIG.

FIG. 7 is an explanatory diagram of a pseudo model created by the unconstrained processing unit in FIG.

8 is an explanatory diagram of a coordinate system of an existing part, a pseudo model, and a new part in the unconstrained processing unit of FIG.

9 is an explanatory diagram of the assembling conditions between the existing part and the pseudo model and the assembling conditions between the pseudo model and the new part shown in FIG. 7;

FIG. 10 is an explanatory diagram of a first table and a second table of FIG.

11 is a flowchart of an assembling process of the present invention using the pseudo model of FIG.

FIG. 12 is a flowchart of component assembly processing using the pseudo model of FIG.

[Explanation of symbols]

 10: Geometrically constrained processing unit 12: Geometrically unconstrained processing unit 14: Three-dimensional CAD application execution unit 16: Database 18: Three-dimensional model 20: External interface 22: Input device 24: Display device 25: Printer 26: Interrupt Control unit 28: Bus 30: Parts pseudo model database 32: Assembly pseudo model database 34: First table creation unit 36: Second table creation unit 38: First table 40: Second table 42: Pseudo model creation unit 44: Table inverse conversion unit 46: Database rewriting control unit 48-1, 48-2: Face matching condition 50: Face aligning condition 60: Pseudo model 60-1 to 6-03: Pseudo assembly face A: Existing part (first Parts) B: New parts (second part)

Claims (12)

[Claims] 1. A three-dimensional model is generated with the support of a computer, and cooperation information such as an application drawing and an inverse model corresponding to the generated three-dimensional model is automatically generated. In a three-dimensional model generation method using a computer-aided automatic design system that automatically changes and generates cooperation information, a second method is applied to an existing first part that constitutes the three-dimensional model.
When assembling parts, a pseudo model in which geometric conditions are independent is created corresponding to the mounting surface of the first part, and the assembling conditions are changed between the pseudo model and the second part. A three-dimensional model generation method characterized by the above. 2. The method for generating a three-dimensional model according to claim 1, wherein the second part is added to the existing first part constituting the three-dimensional model.
A first table creating step of creating a first table in which geometrical conditions required for assembly between the two parts are set by using the first coordinate system of the three-dimensional model when assembling the parts; A pseudo model creating process for creating a pseudo model corresponding to the mounting surface of the first part by a second coordinate system independent of the first coordinate system; and the second part for the pseudo model using the second coordinate system. A second table in which geometric conditions necessary for assembly are set, and the second table is updated according to a change in the assembly condition of the second part with respect to the pseudo model; A table reverse conversion step of performing reverse conversion into the assembly condition of the first table and storing each time the assembly condition of the second table is changed in the second table creation process. Three-dimensional model student Method. 3. The three-dimensional model generating method according to claim 2, wherein in the first table creating step, at least an offset value of a mounting position of the second component with respect to the first component and a surface contact condition are set. In the second table creating step, each of the offset value and the surface contact condition of the first table is converted into a dimension from the origin of the second coordinate system and stored in the second table. Three-dimensional model generation method. 4. The three-dimensional model generating method according to claim 2, wherein in the pseudo model creating step, a pseudo model having a standard shape is created in advance and made into a library, and if necessary, made into a library. A three-dimensional model generation method, characterized in that the selected pseudo model is selected. 5. The method for generating a three-dimensional model according to claim 2, wherein the pseudo model is selectively used when assembling the second part to the existing first part that constitutes the three-dimensional model. A three-dimensional model generation method characterized in that it can be displayed on. 6. The three-dimensional model generation method according to claim 2, further comprising a table output step of displaying or printing a list of the assembling conditions of the first table and the second table according to an output request. A three-dimensional model generation method characterized in that 7. The three-dimensional model generation method according to claim 2, wherein when the second part is assembled to the existing first part that constitutes the three-dimensional model, a third order to be assembled is set. On the display screen of the original model, the parts using the pseudo model are color-coded so that the existing part, the pseudo model, and the new part can be identified, and the first table and the second table are displayed.
A three-dimensional model generation method characterized by displaying the assembling conditions set in a table. 8. A three-dimensional model is generated with the support of a computer, and cooperation information such as an application drawing and an inverse model corresponding to the generated three-dimensional model is automatically generated. In a three-dimensional model generation device using a computer-aided automatic design system for automatically changing and generating cooperation information, a second part is added to an existing first part constituting the three-dimensional model.
A first table creating unit that creates a first table in which geometrical conditions required for assembly between the two parts are set by using the first coordinate system of the three-dimensional model when assembling the parts; A pseudo model creating unit for creating a pseudo model corresponding to the mounting surface of the first part by a second coordinate system independent of the first coordinate system; and the second part for the pseudo model using the second coordinate system. A second table in which geometrical conditions necessary for assembly are set, and the second table is updated according to a change in the assembly condition of the second part with respect to the pseudo model; And a table reverse conversion unit that reversely converts the storage condition of the first table into the storage condition and stores the conversion condition every time the second table creation unit changes the mounting condition of the second table. Three-dimensional model generator. 9. A three-dimensional model is generated with the assistance of a computer, and cooperation information such as an application drawing and an inverse model corresponding to the generated three-dimensional model is automatically generated, and the three-dimensional model is changed according to the change of the three-dimensional model. In a storage medium storing a program for generating a three-dimensional model using a computer-aided automatic design system that automatically changes and generates cooperation information, the first part of the existing first part constituting the three-dimensional model is A first table creating unit that creates a first table in which geometrical conditions necessary for assembly between the two parts are set by using the first coordinate system of the three-dimensional model when assembling the two parts; A pseudo model creation unit that creates a pseudo model corresponding to the mounting surface of the first component by a second coordinate system independent of the first coordinate system; and the second for the pseudo model using the second coordinate system. parts A second table creating unit for creating a second table in which geometric conditions necessary for assembly are set, and updating the second table according to a change in the assembly condition of the second part with respect to the pseudo model; And a table reverse conversion unit that reversely converts the storage conditions of the first table and stores them each time the second table creation unit changes the mounting conditions of the second table. A storage medium that stores the program that generates the original model. 10. A storage medium storing a program for generating a three-dimensional model according to claim 9, wherein the first table creating section includes at least an offset value of an assembly position of the second part with respect to the first part and Each of the surface contact conditions is set, and the second table creation unit converts each of the offset value and the surface contact condition of the first table into a dimension from the origin of the second coordinate system to generate the second table. A storage medium storing a program for generating a three-dimensional model characterized by storing. 11. A storage medium storing a program for generating a three-dimensional model according to claim 10, wherein the pseudo model creating unit creates a pseudo model having a standard shape in advance and creates a library, A storage medium storing a program for generating a three-dimensional model, characterized by selecting a pseudo model in a library as needed. 12. A storage medium storing a program for generating a three-dimensional model according to claim 9, wherein when assembling a second part to an existing first part which constitutes the three-dimensional model. A storage medium storing a program for generating a three-dimensional model, wherein the pseudo model can be selectively displayed.