JP2000182079A - Solid model generation method - Google Patents

Abstract

(57) [Summary] [Problem] When a surface model is solidified after a large number of sub-models generate a main body model in a state of a surface model, the order of solidification of an actual surface model and a cut surface model is determined. To be able to quickly generate a target solid model without making mistakes. SOLUTION: After generating a large number of submodels (solid models) 12a to 14b and the like in a subfile, a substance submodel 14a and the like to be solidified before a cutting submodel in a control file are included in a first group G1. ,
The sub model for solid body 12b etc., which is solidified after the sub model for cut, is divided into a third group G3, and the sub models for cut 12a, 14b etc. are divided into a second group G2 and surfaced. After the first group G1 and the second group G
2. The sub model (surface model) is solidified in the order of the third group G3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a technique for generating a solid model by a computer having an AD function.

[0002]

2. Description of the Related Art Parametric CAD (Computer Aided Desig) is used to design the shape of various members such as press dies.
n) Computers having functions are frequently used. The parametric CAD function is a CAD function for generating a solid model, generating a hollow surface model, and converting between such a solid model and a surface model. After a series of procedures and numerical values of respective parameters are stored, and once a solid model is generated, the solid model is automatically corrected by the same procedure when the numerical values of the parameters are changed.

As a method of generating a solid model by a computer having such a parametric CAD function, as shown in FIGS. 14 and 15, although not yet known, a plurality of sub models are generated in a sub file (SS1). Surface (SS2),
It is considered that the surface model is imported into a main file to generate a main body model (SS3), and thereafter, the sub-model is solidified to make the solid part an entity or cut (SS4).
For example, when generating the mold model 10 having the body seat 12 and the guide hole 14 as shown in FIG.
5, both the cutting sub-model 12a and the sub-model for real body 12b are generated as solid models as shown in FIG. 5, while the guide hole 14 is used as a sub-model for sub-models as shown in FIG. Both the model 14a and the cutting sub-model 14b are generated as solid models. The mold model 10 is a pad that presses a work when trimming a peripheral portion of a press-formed product that has been subjected to a drawing process or the like. The lower end face is a work holding surface 10s having the same shape as the work. (A) of FIG.
3A is a perspective view of the mold model 10, FIG. 3B is an enlarged view of a portion B of FIG. 3A, and FIG. 3C is an enlarged view of a portion C of FIG.

[0004] The cutting sub-model 12a is a
Is formed to form a space in the portion where the sub-model 12b is to be formed, and the target torso seat 12 is formed by providing the upper end of the sub-model for substance 12b so as to protrude into the space. In addition, the sub-model for body 14a is
This is for providing an entity around the part where the 4 is to be formed. The sub-model for cutting 14b is provided so as to overlap the entity, and the overlapping portion is cut to form the target guide hole 14. . Generally, torso seat 12
In any case where the entity is generated as described above and the space such as the guide hole 14 is formed, as described above, the entity sub-models 12b and 14a and the
a and 14b.

The solid models 12a, 12b, 14
a and 14b are both workpiece holding surfaces 10 which are predetermined.
It is generated based on s, and is provided in a positional relationship as shown in FIG. FIG. 8 shows those submodels 12a, 12a
surface models 16a, 16b, 18a, and 18b obtained by surface-forming the surface models 16a, 14a, and 14b, respectively, are read into the main file in the state of the surface models 16a to 18b, and the surface models 1
The body model 20 shown in FIG. 9 is generated by providing a rib or the like on the work holding surface 10s based on the positions of 6a to 18b. As the sub-models, in addition to the ones for the body seat 12 and the guide hole 14, various types necessary for the press die such as a sliding seat, a stopper, and a hanging tool are generated. More specifically, as shown in FIG. A number of surface models are provided.

The main body model 20 is formed by generating a large number of solid models for entities and solid models for cutting.
Since 6b, 18a and 18b have no substance, even if they partially overlap the solid model for cutting, the overlapping part is not cut, and if they overlap with the solid model for substance, they are not integrated. It is not affected by the generation or modification of the body model 20. And
After generating the body model 20, the surface model 1
After returning the solid model 12a to the solid model 12a and cutting the portion, the surface model 16b is changed to the solid model 12a.
By returning the material to the position b, the body seat 12 shown in FIG. 10B is formed. After returning the surface model 18a to the solid model 14a and substantiating it,
By returning the surface model 18b to the solid model 14b and cutting the portion, the guide holes 14 shown in FIG. 10C are formed.

[0007]

However, in such a conventional method for generating a solid model, since a target shape is generated by deleting or adding a procedure, or changing the order, a surface model for an actual sub model is used. When the order of solidification of the surface model and the surface model for cutting was reversed, a solid model having a completely different shape was sometimes generated.
In particular, when a large number of sub-models are used, the operation is troublesome and time-consuming, for example, it is necessary to check the procedure for each individual sub-model when solidifying the surface model.
Specifically, in the case of the torso seat 12, when the surface model 16b is returned to the solid model 12b to be actualized, the surface model 16a is returned to the solid model 12a, and the portion is cut. ), The trunk seat 12 is not formed. In the case of the guide hole 14, the surface model 18b is replaced with the solid model 14b.
After cutting back that part, surface model 1
When the solid model 8a is returned to the solid model 14a and embodied, the guide hole 14 is not formed as shown in FIG.

The present invention has been made in view of the above circumstances, and an object of the present invention is to produce a body model in a state where a large number of submodels are surface models and then solidify the surface model. Another object of the present invention is to enable a target solid model to be quickly generated without making a mistake in the order of solidification of a surface model for an entity and a surface model for cutting.

[0009]

In order to achieve the above object, the present invention is capable of generating a solid model, converting the solid model and a hollow surface model, and processing procedures and parameters. Parametric CAD that automatically corrects the solid model in the same procedure when changing parameters etc.
A method of generating a solid model by a computer having a function, comprising: (a) a first entity submodel to be an entity and a predetermined space formed in the entity so as to partially overlap the entity; A first sub-model generation step of generating a first cut sub-model, and (b) a second cut sub-model forming a predetermined space, and being disposed so as to partially overlap the space and being located in the space. A second sub-model generating step of generating a second sub-model for providing a predetermined sub-model; and (c) the first sub-model for the first sub-model and the second sub-model for the first sub-model. Sub-models for the second group,
A grouping step of grouping the sub-models for the entity into a third group and associating each group so that surface formation and solidification can be performed simultaneously; and In the state, in the same file as the surface model, a body model generating step of generating a body solid model in association with the surface model; and (e) after the body model generating step, the surface model of the first group is Solidifying the surface model of the second group and cutting the solid part to form a space, and then solidifying the surface model of the third group to make it a solid And characterized in that:

[0010]

That is, among the many sub-models for substance, the sub-model for the first substance that needs to be solidified before the sub-model for cutting is put into the first group, and solidified after the sub-model for cutting. The sub-models for the second entity that need to be processed are grouped into a third group, the sub-models for cutting (the first sub-model for cutting and the second sub-model for cutting) are grouped into the second group, and the first The solidification is performed in the order of the group, the second group, and the third group, whereby the order of solidification of the surface model for the entity and the surface model for the cut is prevented as much as possible. In addition, since association is performed so that surface formation and solidification can be performed simultaneously for each group, solidification in the surface formation and solidification process can be performed easily and quickly even when a large number of submodels are used.

On the other hand, in the main body model generating step, a main body model is formed by generating a solid model for a real object or a solid model for cutting based on the position of the surface model and the like, but the surface model has no real substance. Therefore, even if the part overlaps with the solid model for cutting, the overlapping part will not be cut, and it will not be integrated even if it overlaps with the solid model for the entity, such as by creating or modifying the main body model Since there is no influence, the operation of generating the main body model can be performed easily and easily.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, the first model generation step and the second model generation step may be performed either before or after.
It is also possible to perform in parallel, such as generating the first sub-model for the first entity and the sub-model for the second entity, and then generating the second sub-model for the cut and the second sub-model for the cut. The greater the number of these submodels, the more effective the present invention.

The first sub-model for the first entity, the first sub-model for the first cut, the second sub-model for the second sub-model, and the second sub-model for the second cut are preferably generated as solid models from the viewpoint of ease of operation. It may be generated by a model or the like. If generated with a solid model,
Prior to the main body model generation step, for example, the surface may be formed for each group. These sub-models are necessary when generating the main body model.For example, when a solid model of a press die is generated, the press seat such as the body seat, the guide hole, the sliding seat, the stopper, the hanging tool, etc. It is necessary for the mold.

The grouping step does not necessarily need to be performed after all the sub-models have been generated, but is divided into three groups while generating sub-models such as the first real sub-model and the second real sub-model. The sub-models may be divided, or each sub-model may simply be given an identifier indicating which group it belongs to.

The association of the sub-models in each group in the grouping process is such that all the sub-models in the group can be simultaneously surfaced and solidified by, for example, selecting one sub-model in the group by one key operation. It is sufficient that the individual sub-models are not necessarily integrated (summed) even when they partially overlap, but they may be integrated by summing.

The first sub-model generation step and the second
Sub model generation process is common sub file (work place)
It is desirable to perform the grouping process and the surface conversion process in a separate control file, etc., and to perform the main body model generation process and the solidification process in a separate main file. All the work may be performed within. The surfacing step may be performed in the main file.

All of the above steps may be performed in accordance with a command operation such as a selection operation or an input operation by an operator. However, for example, the solidification step can be easily automated. Regarding other steps, work can be facilitated by displaying a series of operation procedures, contents to be input, and the like as images.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram for explaining a basic configuration of a solid model generation supporting device 30 suitably used when generating a solid model according to the method of the present invention, wherein a central processing unit 32 connected by data bus lines and a hard disk It comprises a microcomputer having a main storage device 34 such as a ROM and a ROM, and an auxiliary storage device 36 such as a RAM. The central processing unit 32 performs signal processing according to a program stored in the main storage device 34 in advance while utilizing a temporary storage function of the auxiliary storage device 36 and executes various functions shown in FIG.

The solid model generating means 30a shown in FIG.
Using a basic model such as a predetermined cylinder, square prism, triangular prism, sphere, cone, etc. to change parameters, enlarge, reduce, move, rotate, etc., generate a solid solid model,
A process such as integrating (synthesizing) a plurality of solid models by using a logical operation such as a sum, a difference, and a product is performed. When a plurality of solid models are integrated, the boundary surface disappears and becomes integrated.
The surface model generating means 30b generates a hollow surface model by changing, enlarging, reducing, moving, rotating, etc. parameters using a basic hollow model such as a cylinder, a quadratic prism, a triangular prism, etc. It integrates (combines) surface models and displays them as outlines (including shadows) such as ridges. In this case, the integration is performed simply by combining a plurality of surface models, and the boundary surface remains as it is. Model conversion means 30c
Converts the solid model and the surface model. When a plurality of integrated surface models are converted into a solid model, the boundary surface disappears and is integrated (combined). Further, when the solid model is converted into a surface model, a single hollow body is formed even with a complicated shape obtained by combining a plurality of basic models, and the outline forming the hollow body is displayed. Automatic correction means 30d
After the model creation procedure and the numerical values of each parameter are stored, once a solid model or surface model is created, or after integration, conversion, or correction is performed, the position of the model at an intermediate stage is determined. When the parameter is changed or the numerical value of the parameter is changed, the final model is automatically corrected in the same procedure. These solid model generation means 30a, surface model generation means 30b, model conversion means 30c, and automatic correction means 30d correspond to a parametric CAD function.

The generation procedure instructing means 30e displays a series of operation procedures and contents to be input in an image while generating a solid model according to the procedure shown in FIG. 30a,
Surface model generation means 30b, model conversion means 30
(c) A solid model is generated using the automatic correction means 30d, and is activated in accordance with a selection operation by an operator. That is, the operator is required to perform the solid model generation means 30a, the surface model generation means 30b, and the model conversion means 30.
c, It is possible to generate a solid model by sequentially operating the procedures shown in FIG. 3 by using the automatic correction means 30d, but by activating the generation procedure instruction means 30e,
It is also possible to easily perform a solid model generation operation while confirming operation procedures and operation contents displayed in an image. The main storage device 34 in which a program for executing these units 30a to 30e is recorded corresponds to a recording medium for a solid model generation program.

Returning to FIG. 1, the display device 38 displays an image of a cathode ray tube, a liquid crystal panel, or the like. The process of generating a solid model by the solid model generating means 30a and the process of generating a surface model by the surface model generating means 30b. , An operation procedure, a selection menu, and the like are displayed. A keyboard 40, a tablet 42, and a dial 44 are input operation devices. An operator inputs various information necessary for generating a solid model, generates a solid model or a surface model, issues an integration command, and converts a solid model into a surface. Various commands, such as a command to change the surface model into a solid or a parameter, can be input. The printer 46 is for printing the display contents of the display device 38 and the shape data of the generated solid model, and the like. The network controller 48 is connected to a workstation or a machine tool for transmitting information. belongs to.

Hereinafter, a specific description will be given with reference to FIGS. 3 and 4. In the following description, a case in which the mold model 10 of FIG. 10 is generated will be described, and a detailed description of the same portions as those described above will be omitted.

In step S1 of FIG. 3, an instruction to generate a sub model in the sub file is displayed on the display device 38 by the generation procedure instructing means 30e, and the solid model is input in accordance with a command operation such as an input operation or a selection operation by an operator. While utilizing the function of the generating means 30a, as shown in FIG. 4 (a), the sub-models of the parts necessary for the mold model 10, such as the body seat, the guide hole, the sliding seat, the stopper, and the hanging tool, are formed by the solid model. Generated. FIGS. 5 and 6 show an example of the sub model generated in step S1. The sub model for cut 12a and the sub model for substance 12b in FIG. The sub-model for body 14a and the sub-model for cutting 14b are for forming the guide hole 14. Step S1 corresponds to a first sub-model generation step and a second sub-model generation step.

In step S2, the generation procedure instructing means 30
e, an instruction to read a large number of submodels generated in step S1 into the control file and to group them into the first group G1, the second group G2, and the third group G3 is displayed on the display device 38. According to the command operation of (1), grouping is performed as shown in FIG. The criterion for grouping is that the sub-model for the entity that needs to be solidified before the sub-model for cutting is the first group G1, and the sub-model for the entity that needs to be solidified after the sub-model for cutting is the third group. G3
Thus, the sub model for cutting is the second group G2, and the criteria for such grouping are also displayed on the display device 38.
For example, the sub-model for real body 12b in FIG. 5 needs to be solidified after forming a predetermined space by the sub-model for cut 12a, so the sub-group for real body 14a in FIG. Since it is necessary to solidify the space before the space (guide hole 14) is formed by 14b, it is the first group G1, and both the cutting sub-models 12a and 14b are the second group G2. The cutting sub-model 12a corresponds to a second cutting sub-model, the entity sub-model 12b corresponds to a second entity sub-model, and the entity sub-model 14a corresponds to a first entity sub-model. Submodel 14b is the first
This corresponds to the sub model for cutting.

Also, by integrating (summing) the functions of the solid model generating means 30a for each of the groups G1 to G3, the submodels in each of the groups G1 to G3 are selected at once by one key operation. They are associated so that surfacing and solidification occur simultaneously. FIGS. 7A and 7B are diagrams showing sub models (solid models) for each of the groups G1 to G3. FIG. 7A shows a first group G1, FIG. 7B shows a second group G2, and FIG. 7C shows a third group G3. Step S2 corresponds to a grouping step.

In the next step S3, an instruction to be surfaced and integrated for each of the groups G1 to G3 is displayed on the display device 38 by the generation procedure instructing means 30e, and by the function of the model converting means 30c in accordance with the instruction operation of the operator. For example, as shown in FIG.
6b, 18a, 18b are generated and integrated. The integration of the surface models 16a to 18b is such that the surface models 16a to 18b are arranged at predetermined positions in a predetermined common space. Is maintained. This step S3 is a surface-forming step, but it is not necessary to judge an operator in particular, so that it can be automatically performed by one key operation or the like.

In step S4, the generation procedure instructing means 30
e allows the surface models 16a-
18b is displayed on the display device 38, and an instruction to generate a main body model is displayed on the display device 38.
As shown in (c), the surface models 16a to 18b are read from the control file into the main file, and a solid model is generated based on the positions of the surface models 16a to 18b and the work holding surface 10s created in advance. Using the function of the means 30a, as shown in FIG.
The main body model 20 is generated so as to partially overlap with the like. Step S4 is a body model generation step. In addition,
In FIG. 9, the surface models 16a to 18b are omitted.

In the last step S5, the instructions to be solidified in order from the first group G1 are displayed on the display device 38 by the generation procedure instructing means 30e, and the surface model 18a of the first group G1 is operated according to the instruction operation of the operator. And the like, and solidify the surface models 16a, 18b, etc. of the second group G2, and cut the solid portions to form a space. Then, the surface models 16b, etc. of the third group G3 are formed. Solidify to a substance. This allows
As shown in FIG. 10, a mold model 10 having a body seat 12, a guide hole 14, and the like is generated. Step S5 is a solidification step, but it does not require any particular judgment by the operator, so that it can be automatically performed by one key operation or the like.

In this embodiment, after generating a large number of sub-models 12a to 14b and the like in step S1, the large number of sub-models (solid models) 12 are generated in step S2.
Among the sub-models a to 14b, the sub-models for the entity that need to be solidified before the sub-model for cutting are grouped into the first group G1, and the sub-models for the entity that need to be solidified after the sub-model for cutting 12b and the like are grouped into a third group G3, and the cutting sub-models 12a and 14b and the like are grouped into a second group G2. In the solidification process of step S5, the first group G1 and the second group G
Since the solidification is performed in the order of the second and third groups G3, it is possible to prevent the order of solidification of the surface models 16b and 18a for the entity and the surface models 16a and 18b for the cut from being mistaken as much as possible. Also, groups G1 to G1
Since the surface formation and the solidification are associated so that they can be performed simultaneously for each G3, the surface formation step (step S3) even when a large number of submodels are used.
Surface and solidification process (Step S
The solidification in 5) can be easily and quickly performed.

On the other hand, in the main body model generation step of step S4, the main body model 20 is formed by generating a solid model for the entity or a solid model for the cut based on the positions of the surface models 16a to 18b and the like. However, since the surface models 16a to 18b and the like have no substance, even if they partially overlap the solid model for cutting, the overlapping part is not cut, and they are integrated even if they overlap with the solid model for substance. For example, there is no influence from the generation and correction of the main body model 20, and the generation of the main body model 20 can be performed easily and easily.

FIGS. 11, 12, and 13 correspond to FIGS. 7, 8, and 10, respectively, and have a large number of sub-models and are closer to the actual mold design.

Although the embodiment of the present invention has been described in detail with reference to the drawings, this is merely an embodiment,
For example, although the solid model generation support device 30 has been described in the above example, various general-purpose machines can be used as long as the computer has a parametric CAD function. It can be implemented in an improved manner.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a solid model generation support device capable of generating a solid model according to a method of the present invention.

FIG. 2 is a block diagram illustrating functions provided in the apparatus of FIG. 1;

FIG. 3 is a flowchart illustrating a procedure for generating a solid model using the apparatus of FIG. 1;

FIG. 4 is a diagram showing a specific work flow when generating a solid model according to the flowchart of FIG. 3;

FIG. 5 is a diagram showing an example of a sub model generated in step S1 of FIG.

FIG. 6 is a diagram showing another example of the sub model generated in step S1 of FIG.

FIG. 7 is a diagram illustrating an example of sub-models grouped in step S2 of FIG. 3;

FIG. 8 is a diagram showing a surface model of the sub model of FIG. 7 integrated with the sub model.

FIG. 9 is a diagram illustrating an example of a main body model generated based on the surface model and the like in FIG. 8;

FIG. 10 is a diagram showing a final shape obtained by solidifying a surface model included in the main body model of FIG. 9;

FIG. 11 is a diagram corresponding to FIG. 7, showing a model having a large number of sub-models and closer to an actual mold design.

FIG. 12 is a diagram corresponding to FIG. 8, showing a surface model of the sub model of FIG. 11 integrated with the sub model;

13 is a diagram corresponding to FIG. 10, showing a final shape obtained by generating a main body model based on the surface model of FIG. 12 and then solidifying the surface model.

FIG. 14 is a flowchart illustrating a solid model generation method that is a premise of the present invention.

FIG. 15 is a diagram showing a specific work flow when generating a solid model according to the flowchart of FIG. 14;

FIG. 16 is a diagram showing an example of a model shape when the order of solidifying the sub-model for entity and the sub-model for cutting in step SS4 of FIG. 14 is wrong;

[Explanation of symbols]

10: Mold model (solid model) 12a: Sub model for cutting (sub model for second cutting) 12b: Sub model for entity (sub model for second entity) 14a: Sub model for entity (sub model for first entity) 14b: Sub-model for cutting (sub-model for first cutting) 16a, 16b, 18a, 18b: Surface model 20: Body model 30: Solid model generation support device (computer) G1: First group G2: Second group G3 : Third group Step S1: First submodel generation step, second submodel generation step Step S2: Grouping step Step S4: Body model generation step Step S5: Solidification step

Claims (1)

[Claims] 1. A solid model can be generated, a solid model and a hollow surface model can be converted, and a processing procedure and numerical values of parameters are stored. A method of generating a solid model by a computer having a parametric CAD function for modifying a solid model, comprising: a first sub-model for an entity that is to be an entity; and a sub-model that is arranged so as to partially overlap the entity. A first sub-model generation step of generating a first cut sub-model that forms a predetermined space; a second cut sub-model that forms a predetermined space; and a second sub-model that is arranged so as to partially overlap the space. A second entity for generating a second entity sub-model for providing a given entity in the space;
A sub-model generation step, the first entity sub-models being grouped into a first group,
The cutting sub-model and the second cutting sub-model can be divided into a second group, and the second sub-model can be grouped into a third group, and surface formation and solidification can be performed simultaneously for each group. A main model generating step of generating a main body solid model in association with the surface model in the same file as the surface model in a state where all of the sub-models are surface models; After the model generation step, the surface model of the first group is solidified into a substance, then the surface model of the second group is solidified, and the solid part is cut to form a space. Solidify 3 groups of surface models to make them real Solid model generating method characterized by having a solid step that.