JP3095334B2 - How to create structure data for press dies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a structure comprising a product shape portion and a corresponding structure portion, and when the product shape portion is changed, a new product shape portion corresponding to the new product shape portion is obtained. The design data of the structural part is converted to CAD (computer aided d
esign: Computer-aided design) A method for creating die structure data of a press die created by a system, more specifically, a product shape forming unit for forming a work into a predetermined product shape, and a mold structure for holding the product. Out of the mold structure for press molding consisting of
The present invention relates to a method of creating die structure data of a press die created by an AD system.

[0002]

2. Description of the Related Art As is well known, a press die is basically composed of an upper die and a lower die. As shown in FIG. 12, each die, in other words, each die structure 1 ,fundamentally,
It comprises a product shape forming part 2 for forming a plate material as a work into a desired product shape, and a mold structure part (simply referred to as a mold structure) 3 for holding the product shape forming part 2. In this case, the mold structure 3 includes a guide post 4 for engaging the upper mold and the lower mold, a scrap cutter for cutting off unnecessary portions of the work, a cam for forming a bent portion and the like on the work, and a pressing force applied to the work. And a mold part such as a urethane spring (also called a urethane pad) for uniformly applying the mold.

The mold structure 1 shown in FIG. 12 is for forming a side panel outer of a four-wheel passenger car having four doors. Therefore, the product shape forming unit 2 is basically defined by the outer shape definition line 5 and the door shape definition lines 6 and 7.

[0004] Such a mold structure 1 is a well-known commercially available CA.
Designed by D system. When designing the mold structure 1, as shown in FIG.
The product shape data Da created in advance by the AD system is transmitted from a host computer (not shown) to an input port 1.
1 is supplied to a CAD system 12 for mold structure design. The CAD system 12 automatically creates data (hereinafter, referred to as product shape forming unit data) Db of the product shape forming unit 2 based on the product shape data Da. The product shape forming part data Db is created based on the product shape data Da in consideration of the thickness of the work, whether it is an upper mold, a lower mold, or the like.

[0005] The created product shape molded part data Db is:
A reference point (also referred to as an origin) O (see FIG. 12) of the product shape, for example, three-dimensional position coordinate (XYZ position coordinate) data representing a dimension from the center of the product shape. In the present invention, the Z-axis position coordinate data (coordinate data in a direction perpendicular to the paper surface in FIG. 12) is data accompanying the two-dimensional position coordinate (XY position coordinate) data. Except in the following cases, description will be made using two-dimensional position coordinate data to facilitate understanding of the invention.

After the product shape forming part data Db is created, data for designing the mold structure part 3, ie, the mold structure part data Db
c is created by manual data entry.

The mold structure portion data Dc is based on two-dimensional position coordinate data (actually three-dimensional position coordinate data, but here, two-dimensional position coordinate data for convenience) representing dimensions from the origin O. Created. For example, in FIG.
The type structure data Dc at the upper right point Q in the type structure 3 is D
Created as c = Q (A, B). Similarly, three-dimensional position coordinate data of mold parts, such as a guide post 4, a scrap cutter (not shown), a cam, and a urethane spring, which are not shown, forming the mold structure 3 are created. In the case of the side panel outer mold according to the example of FIG. 12, the mold structure data Dc is about 20 in one of the upper mold and the lower mold.
Data representing 00 points is needed. The data input of the mold structure part data Dc is performed manually by a specialized operator according to a certain mold structure design standard.
It has taken a considerable amount of time.

[0008] The mold structure data Dd composed of the mold structure data Dc and the product shape molding data Db created in this way is output to the well-known CAM through the output port 13.
(Computer aided manufacturing).

The CAM system creates tool trajectory data for the mold structure 1, so-called CL data. Based on the CL data, most of the mold structure 1 is automatically manufactured by an NC machine tool or the like. Then, a press-molding die including the upper die and the lower die is completed.

[0010]

When a new product shape is determined by the development of a new product or a model change of a product, a new mold structure for molding the new product shape is required. Therefore, it is necessary to create new mold structure data for producing the new mold structure.

In this case, the creation of the mold structure part data requires a special operator to manually input the data again in accordance with a certain mold structure design standard. This is an issue. That is, the previously created type structure part data is
This is because if the data can be used as the mold structure data of different products (different models), the number of steps can be reduced considerably.

As a prior art related to the present invention, there is a "method of correcting the position of a part in a mold design" disclosed in Japanese Patent Application Laid-Open No. 3-123977. This technique uses a mold structure (referred to as a mold plate in the publication).
The four corners or the representative points of the parts pre-arranged in the mold structure are set as reference points, and the relative positions from the reference points are designated to determine the arrangement positions of the parts. This is a technique for changing the position of a part positioned with respect to a reference point in accordance with the movement of a part. According to this technique, when changing the arrangement position of parts having a certain mutual relation from the corner positions of four corners such as a guide pin and a sleeve,
It is said that complicated calculations and input operations are not required.

However, in this prior art,
No consideration is given to the arrangement of parts related to the above-described product shape, for example, the above-described mold parts such as the scrap cutter, the cam, and the urethane spring, and the design of a part of the mold structure is automated. It's just

The present invention has been made in consideration of such problems, and when a product shape (model shape, etc.) is changed, a structure (for example, a mold structure) of a structure (eg, a mold structure) depends on the product shape. It is an object of the present invention to provide a method of creating structural data (for example, mold structural data) of a press die, which enables all to be created by a CAD system.

[0015]

[0016]

According to an aspect of this invention, the press die
Press consisting of a product shape part and a corresponding structure part
Of the mold structures, CA
In a method for creating structural part data of a press die created by a D system, a reference structure representing a positional relationship up to a predetermined position of a reference structural part with each position of a plurality of feature points in a reference product shape part as a reference point. Steps for creating department data
And the step of creating new structural part data corresponding to the new product shape data representing the new product shape part.
In the step of creating the new structural part data
Is a coordinate value of the reference point position of the reference structure data is replaced with the position coordinates of the feature points in the new product shape portion which corresponds to each of the plurality of feature points in the reference product shape portion The reference structure part data after the reference point position coordinate value replacement is used as the new structure part data.

Further, according to the present invention, the positional relationship between a feature point in the new product shape portion and the new structure portion is as follows:
The positional relationship between the feature points in the reference product shape portion and the reference structure portion is substantially maintained, and only the product shape portion is enlarged or reduced, or vertically and horizontally independently scaled.

Furthermore, the present invention is characterized in that the positional relationship is described by a dimension or a relational expression.

Furthermore, the present invention is characterized in that the product shape part is a product shape forming part, the structure part is a mold structure part, and the structure is a mold structure.

[0020]

[0021]

In accordance with the this invention, novel when creating a new structure data corresponding to the product shape data, the reference structure data created in a positional relationship of characteristic points in advance the reference product shape portion wherein the position coordinates of the feature points, the new according
The reference structure part data obtained by replacing the position coordinate values of the feature points relating to the new product shape data representing the new product shape parts and replacing the position coordinate values of the feature points is used as new structure part data. For this reason, the new structure part data is automatically converted into data representing a positional relationship from a feature point in the new product shape part to a predetermined position of the new structure part.

Further, according to the present invention, a new product form
When trying to create new structure part data corresponding to new product shape data representing a shape part, the positional relationship between a feature point in the new product shape part and the new structure part is determined by the reference product shape part. Wei and lifting the positional relationship between the feature points the reference structure in the enlarged or reduced only product shape portion, or since so as to create scaling the aspect independently as a new structural unit data , you can use a reference structure data that has been created previously remains fully.

Furthermore, according to the present invention, since the positional relationship is described by a dimension or a relational expression, the configuration of data can be intuitively understood.

Furthermore, according to the present invention, when creating new mold structure data corresponding to new product shape data, the reference mold structure data previously created based on the reference product shape data and The new mold structure data is created from the new product shape data. When creating new mold structure data, the reference mold structure data created in advance is used, so compared to the work of creating new mold structure data directly from new product shape data, There is a possibility that the number of work steps can be significantly reduced.

Furthermore, according to the present invention, when creating new mold structure data corresponding to new product shape data, the reference mold previously created as dimensional data from the feature points of the reference product shape is prepared. The position coordinate value of the feature point according to the structure part data is replaced with the position coordinate value of the feature point according to the new product shape data, and the reference type structure part data obtained by replacing the position coordinate value of the feature point is newly added. Type structure part data.

In this way, the new mold structure data is automatically converted to data representing the dimensions from the feature point in the new product shape to the predetermined location of the new mold structure. At the predetermined location, for example, mold parts such as a guide post and a scrap cutter, a cam, and a urethane spring related to the product shape are arranged and fixed. Therefore, the four corners of the mold structure such as guide pins and sleeves are fixed. It is possible to reduce the calculation and data input operation for arranging all the parts related to the product shape part, not limited to the parts having a certain mutual relationship from the corner position or the like.

[0027]

An embodiment of the present invention will be described below with reference to the drawings. In the drawings referred to below,
Components corresponding to those shown in FIGS. 12 and 13 are denoted by the same reference numerals, and detailed description thereof will be omitted. In addition, in order to avoid duplication of the drawings, description will be made with reference to FIGS.

As a CAD system to which an embodiment of the present invention is applied, a well-known CAD system, for example, a CAD system disclosed in Japanese Patent Application Laid-Open No. 4-276865 filed by the present applicant can be used. . First, the configuration of the CAD system will be schematically described.

FIG. 1 shows the CAD system 12 (FIG. 13).
This is the same as the CAD system 12 shown in FIG. ) Is shown. C connected to the host computer 21 through a network 22 such as an Internet
The AD system 12 is a computer 2 having a central processing unit and having a role of performing graphic calculations and display control database management.
3. A large-capacity storage device 24 such as an optical disk capable of storing and updating a large amount of graphic information, a graphic output device 25 such as an XY plotter, and a central device for dialogue between the CAD system 12 and its user (operator). A plurality of graphic display devices 2 used in conjunction with an input device
6. Tablet 31 with stylus pen connected to each graphic display device 26, keyboard 3
2, a device such as a mouse 33 and a light pen 34.

The CAD system 12 has many programs as shown in FIG. Each program can be classified into the following modules according to the functions to be shared. (A) An operating system 41 and a control module 42 for controlling the processing and the flow of information in the CAD system 12 (b) An input for assisting an input operation corresponding to various input devices, for example, a keyboard 32, to be performed smoothly. Module 43 (c) Input interpretation module 44 that interprets the input information in accordance with the format of the command instruction. (D) Display module 45 that manages display information and performs display processing in accordance with the command. (E) From a submodule corresponding to the instruction. Command module 4 for performing graphic processing according to the composed command
6 (f) Database operation module 48 for efficiently searching and storing a large amount of information necessary for CAD system 12 held in database 47 (g) Macro program 5 including automatic design program
(H) an external system interface 53 for exchanging information with and interlocking with other CAD systems 53. The CAD system 12 has a system configuration and standard values to maintain expandability and maintainability. Control file 54 for storing the operability of each command and the program control procedure.
5. An auxiliary file such as a display control file 56 for storing the model and configuration of the display device is prepared. In addition, as auxiliary items, a graphic processing library 57 for performing graphic processing, a display library 58 for displaying on the graphic display device 26, and a release utility for displaying processing results to the graphic output device 25. 5
9. Data exchange utility 60 for coupling with another CAD system connected to host computer 21
Etc. are prepared.

Each module will be briefly described.

The control module 42 converts the group of programs into modules, and
Performs centralized control of system control and standardizes calling procedures. Its functions include start, end, abnormal processing, execution control of each module, recording of execution history, debugging function processing, special processing with the operating system 41, and the like.

The input module 43 provides a user with a comfortable input procedure in accordance with a standardized arrangement of various input methods of various input devices. Its functions are to prompt the user for the type of information to be input, the input method and the input device, to select the input device, and to convert the input information to a standard type.

The input interpretation module 44 supports various input instruction methods by unifying the input information interpretation method and the result display, thereby improving input operability and maintaining the expandability of the system. Its function is to interpret the input information and display the interpretation result.

The display module 45 uniformly processes various display operation requests and manages display information and display states.

The command module 46 centrally manages the format of input arguments, the calling of a processing program according to the command, and the processing method of the result, and maintains the maintainability and expandability of the system.

The database operation module 48 standardizes the request method from other modules and provides recovery means when a failure occurs. Its function is to perform management, operation, and processing when a failure occurs in the use state of the database 47.

The external system interface 53 standardizes the exchange of information with other systems, and makes effective use of the CAD system 12. Its function is to exchange information with an external system and to control the operation of an external program.

The macro module 52 controls the execution of the CAD system 12 in accordance with the created macro program 51. Its function is to translate and execute the macro program 51.

One embodiment of the present invention can be implemented using the CAD system 12 described above. In the following description of the operation, it is complicated to refer to the CAD system 12 each time. Therefore, the CAD system 12 will be referred to only when necessary.

Next, the operation of the embodiment of the present invention will be described with reference to the flowchart shown in FIG. The control subject in the flowchart of FIG. 3 is the computer 23 (see FIG. 1). In order to facilitate understanding of the invention, in this embodiment, the product shape portion is a product shape forming portion for a press die, and the structure portion is a mold structure portion for holding the product shape forming portion. Therefore, the structure will be described as a mold structure including a product shape molding portion and a mold structure portion that holds the product shape portion.

Accordingly, first, reference product shape data (hereinafter, referred to as reference product shape data) Da (which is the same as that shown in FIG. 13) which is created in advance by another CAD system is used as a host computer. 21 (step S1).

Next, the read reference product shape data Da
The design data (hereinafter referred to as a reference product shape forming unit) of a product shape forming unit (hereinafter referred to as a reference product shape forming unit) 2 (refer to FIG. 12) serving as a reference for forming the mold structure 1 (see FIG. Db (see FIG. 13) is CA
It is created by the D system 12 (step S2). As described in the section of the related art, the reference product shape forming part data Db is created based on the reference product shape data Da in consideration of the thickness of the workpiece and whether the workpiece is an upper mold or a lower mold. Data. As described with reference to FIG. 12, the reference product shape forming section 2 in the side panel outer of the 4-door passenger car basically includes the reference outer shape definition line 5.
And the reference door shape definition lines 6 and 7.

The created reference product shape forming part data Db
Is a reference point (also referred to as an origin) O of the reference product shape (FIG. 1).
2), for example, three-dimensional position coordinate data representing the dimension from the center of the reference product shape.

Next, design data Dca (hereinafter referred to as reference mold structure data) of the mold structure 3 (see FIG. 12) serving as a reference is created (step S3). The reference type structure part data Dca has data contents unique to the present invention.

That is, as shown in FIG. 4 showing a detailed flowchart of step S3, first, feature points (also called control points or feature points) CP of the product shape are set (step S3-1). As shown in FIG. 5, the feature points CP are created at points where the product shape can be substantially reproduced by interpolation such as linear interpolation or circular interpolation. In the case of the side panel outer in which the product classification as shown in FIG. 5 is classified as a 4-door passenger car, for example, eleven feature points CP on the reference external shape definition line 5 are represented by CP =
P1 to P11 are set.

The reference type structure part data Dca is created as data defined by a combination of one of the characteristic points P1 to P11 or a plurality of neighboring characteristic points (step S3-2).

Here, the creation of the reference mold structure data Dca relating to the guide post 4, the cam 61, the urethane spring 62, the scrap cutter 63, etc., which are the structural components constituting the reference mold structure 3, will be described. In FIG. 5, all four guide posts 4 provided on the reference mold structure 3 are shown, but several cams 61 provided,
Only one to three urethane springs 62 and scrap cutters 63 are shown.

Data representing the product shapes of the guide post 4, the cam 61, the urethane spring 62 and the scrap cutter 63 are stored in the CAD system 12 as product shape data of standard parts. The product shape data is obtained from the parts origins 4r, 61
A positional relationship, for example, a relational expression is described (defined) based on the positional coordinate values of r, 62r, and 63r. Therefore,
By specifying only the position coordinate values of the parts origins 4r, 61r, 62r, 63r, the positions of those parts are automatically specified.

Here, in order to facilitate the understanding of the present invention, for example, a description of the dimensions of the reference mold structure data Dca of the guide post 4 (actually, a plurality of three-dimensional position coordinate values) Described in FIG. 6), as shown in FIG.
It is represented by a vector Pg. In this case, the vector P
g is the starting point of the origin O, and the component origin 4 of the guide post 4
This is a vector ending at r. This vector Pg is
It can be easily understood that the vector of the X-direction component is obtained as a vector Pgx and the vector of the Y-direction component is obtained as a vector Pgy, as shown in the following equation (1).

Vector Pg = Vector Pgx + Vector Pgy = Vector P6x + Vector a + Vector P3y + Vector b (1) In equation (1), the vector P6x is the X direction of the vector P6 starting from the origin O and ending at the feature point P6. The vector P3y is a component vector, and the vector P3y is a Y-direction component vector of the vector P3 starting from the origin O and ending at the feature point P3.

The component origin 4r of the guide post 4 is an offset amount from the maximum width point of the product shape defined by the outline shape definition line 5 to the outside of the X axis. In the example of FIG. A constant vector a representing a predetermined offset amount to
Offset amount from the maximum height point of the product shape to the outside of the Y axis,
In the example of FIG. 6, the definition is made using a constant vector b representing a predetermined offset amount from the feature point P3 to the outside of the Y axis.

The vector Pg is represented by a scalar coordinate value (P
gx, Pgy), the coordinate values (Pgx, Pg
y) is (Pgx, Pgy) = (P6x + a, P3y +
b). The value a and the value b are predetermined and given values, and the value P6x and the value P3y can be easily calculated from the vectors P6 and P3 up to the feature points P6 and P3.

After all, as can be understood from the right side of the equation (1), the reference type structure part data Dca of the guide post 4 is 2
This is set as data described (represented) by relative dimensions (relational expressions) with the two feature points P3 and P6 as reference points.

Similarly, the vector Pc of the cam 61 is shown in FIG.
, It can be understood that it is represented by a vector obtained by the following equation (2).

Vector Pc = Vector P1 + {(Vector P2-Vector P1) / 2} + Vector b (2) That is, the reference-type structure portion data Dca of the cam 61 is relative to the feature points P1 and P2 as reference points. It is set as data represented by dimensions (relational expressions).

It can be seen that the vector Pu of the urethane spring 62 can be obtained by the following equation (3), where β is a constant (see FIG. 8).

Vector Pu = Vector P2 + β (Vector P3-Vector P2) + Vector c (3) That is, the reference type structure portion data Dca of the urethane spring 62 has relative dimensions (relationships) with the feature points P2 and P3 as reference points. Is set as data represented by the following expression.

Although the formula for the scrap cutter 63 is omitted, the reference type structure data D of the scrap cutter 63 is
The ca is set as data represented by relative dimensions (relational expressions) based on the feature points P9 and P10 (see FIG. 5).

In this way, all the reference type structure data Dca relating to the reference type structure 3 in step S3 is created.

Next, the created reference type structure part data Dc
A product classification for “a” is given (step S4).
The assignment of the product classification is to be used as a reference for judging similarity when creating new mold structure part data relating to a new product shape, as described later. Reference type structure part data Dc
For a, a product classification of “(4-sided passenger car)” is given.

The other product classifications include “two-door passenger car (side panel outer)”, “three-door hatchback passenger car (side panel outer)”, “five-door hatchback passenger car (side panel outer)”, "5-door station wagon passenger car (side panel outer)" and the like. Actually, the assignment of the product classification is performed when the reference product shape data Da is created.

The reference mold structure data Dca for each model name to which the product classification is assigned is the reference product shape molding data Dba.
At the same time, it is stored in the mass storage device 24 (see FIG. 1) as a database as the mold structure data Dda.

Next, product shape data Dab (hereinafter referred to as new product shape data) of a new product created by another CAD system and for which new mold structure data is to be created from now on (see FIG. 1). Is read from the host computer 21 (step S5).

The design of a new product shape forming part 2b (illustrated and explained later) constituting a new mold structure 1b (illustrated and explained later) based on the read new product shape data Dab. Data (hereinafter, referred to as new product shape forming part data) Dbb is automatically created by the CAD system 12 (step S6).

Next, a product classification for this new product is input (step S7). Even in this case,
Actually, since the product classification is data as an index accompanying the new product shape data Dab, it is automatically input.

The newly input product classification is, for example,
In the case of "4 door passenger car", the data content of the mass storage device 24 is searched using this as an index (keyword), and the model name is displayed on the graphic display device 26 together with the model name of the product classification "4 door passenger car". The name of the structure data Dda (reference type structure part data Dca, reference product shape forming part data Dba) is displayed.

The reference type structure data Dca is read into the database 47 by designating the reference type structure data Dca with the keyboard 32 (step S).
8).

FIG. 9A shows a new product shape forming part 2b created by the new product shape data Dab and basically represented by the outer shape definition line 5b and the door shape definition lines 6b and 7b.

FIG. 9B again shows the reference product shape forming section 2 created based on the reference product shape data Da and represented on the same scale as FIG. 9A.

Next, the characteristic points P1 to P11 generated on the reference product shape forming section 2 are placed on the new product shape forming section 2b.
Are generated (step S9).

Finally, new type structure data Dcb is created (step S10). In this case, new type structure part data Dcb is created simply by replacing the coordinate values of the feature points P1 to P11 in the reference type structure part data Dca with the coordinate values of the feature points P1b to P11b, respectively.

For example, in the reference type structure portion data Dca, the vector Pg relating to the guide post 4 is as follows when the expression (1) is re-presented.

Vector Pg = Vector P6x + Vector a + Vector P3y + Vector b (1) Correspondingly, the starting point of the new mold structure data Dcb according to the guide post 4b shown in FIG. The vector Pgb, which is the component origin 4rb of the component 4b, can be expressed as in equation (4).

Vector Pg = Vector P6bx + Vector a + Vector P3by + Vector b (4) In equation (4), constant vector a and constant vector b are the same as those in equation (1). Further, the vector P6bx and the vector P3by are the X-direction component vector and the Y-direction component vector of the vectors P6b and P3b starting from the origin O and ending at the feature points P6b and P3b of the new product shape, respectively.

Similarly, the vector Pcb of the cam 61b is
The vector Pub of the urethane spring 62b is expressed by the following equation (5).

Vector Pcb = Vector P1b + (Vector P2b−Vector P1b) / 2 + Vector b (5) Vector Pub = Vector P2b + β (Vector P3b−Vector P2b) + Vector c (6) Equations (4) to (6) According to the formula, the guide post 4b according to the new mold structure data Dcb indicating the position (of each part) of the mold structure 3b constituting the mold structure 1b (see FIG. 10);
The positions of the cam 61b, the urethane spring 62b, and the like are respectively new feature points (P3b, P6b), (P1b,
P2b) and (P2b, P3b) are set as data represented by relative dimensions based on them.

The mold parts such as the guide post 4b, the cam 61b, the urethane spring 62b and the scrap cutter 63b are basically made of the original mold parts such as the guide post 4, the cam 61, the urethane spring 62 and the scrap cutter 63. If only the part whose dimensions do not match is used as another part, in this case, a mold part having a small dimension is used, the man-hour for creating the mold structure part data Dcb can be reduced. Further, by using the mold parts as standard parts, the cost of the mold itself can be reduced. Management by reducing the number of mold parts
Storage costs can also be reduced.

As described above, according to the above-described embodiment, FIG.
As shown in A, first, feature points CPa, CPa on a contour shape definition line 91 representing the size of a reference product shape.
b, etc. are generated to recognize the dimensions of the product. Next, dimensions E, F, etc., which represent the shape and size of the mold structure 92, are designated by the characteristic points CP.
a, CPb, etc. as a reference point, for example, dimensions,
Expressed by a relational expression. Finally, when trying to create mold structure data of a product shape similar to the reference product shape,
As shown in FIG. 11C, corresponding feature points CPa ′, C on the outer shape definition line 93 representing the size of the new product shape.
By setting the positional relationship from Pb ′ to the corresponding point of the new mold structure portion 94 with the above-described dimensions E and F, it is possible to automatically create the mold while maintaining the correlation between the mold sizes. .

As a result, the new mold structure 94 has a product shape molding portion 95 on which the positional relationship between the characteristic points CPa ′ and CPb ′ on the new product shape molding portion 102 and the new mold structure portion 94 becomes a reference. Only the new product shape forming section 102 is enlarged or reduced (meaning similar enlargement or reduction) while maintaining the positional relationship between the above feature points CPa and CPb and the reference mold structure 92. The vertical and horizontal dimensions are scaled independently.

In this case, all the dimensions of the mold structure 92 are
In the conventional technology defined by the absolute dimensions from the origin O,
Since the relative relationship between the mold structure portion 92 and the product shape forming portion 95 is not represented, if the product shape changes, 200
Although it was necessary to change zero or more dimensions, the relative positional relationship display (relative dimension display) with the feature point as the reference point makes it possible to associate the mold structure 92 with the product shape molding part 95. Thus, the know-how of the mold design can be described by the dimensions and mathematical expressions (relational expressions), so that it is sufficient to change the dimensions only for the characteristic points. With such a definition, the modification and abolition of the mold structure, so-called maintenance, is considerably simplified.

That is, when the product shape is changed, it is possible to design the mold structure only by exchanging the feature points, and it is not necessary to change the absolute dimensions of the mold structure. , Can be easily created.

As described above, the degree of similarity between the reference product shape and the new product shape may be a certain degree of similarity between “four-door passenger cars” as described above. The data of the mold structure is used to convert
It can be used as reference mold structure data of new mold structure data for a door passenger car or a light 4-door regular car. In these models, the mold structure part data can be created with the same number of feature points. Actually, about 70 to 80% of the new mold structure data is automatically created by the method according to the present embodiment, and the remaining about 20 to 30% of the data need only be re-input and finely corrected. Was.

In the above-described embodiment, the product shape portion is the product shape forming portion 2 for the press die, and the structure portion is the mold structure portion 3 for holding the product shape forming portion 2. Although the structure has been described as being the mold structure 1 including the product shape forming portion 2 and the mold structure portion 3 holding the product shape, the present invention is not limited to this.

For example, when the product shape portion is a car body, the structural portion can be considered as an assembly jig for assembling the car body or a welding jig for welding to the car body. In this case, a new assembling or welding treatment for the new vehicle body is performed based on the reference product shape portion data previously created as relative position data from the reference vehicle body characteristic point and the new vehicle body characteristic point position data. Component position data can be created.

Further, as another example, the present invention can be applied to creation of jig position data for a vehicle body performance tester. That is, new jig position data for a performance test machine of a new vehicle body can be created from jig position data for a performance test machine that has been created based on the feature points of the vehicle body as a reference.

Further, as another example, the present invention can be applied to the design of a vehicle body. For example, when various parts of the vehicle body are designed with reference to the main chassis, when a new main chassis is created, the various parts corresponding to the main chassis can be easily designed. It can also be applied to the design of optional parts such as roof rails and door visors.

The present invention is not limited to the above-described embodiment.
It goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0089]

As described above, according to the present invention, when a new structure (for example, a new mold structure) data is created, a reference structure (for example, a reference mold) which has been created in advance is used. The use of (structure) data makes it possible to significantly reduce the number of man-hours compared to the work of directly creating new structure (eg, new mold structure) data from new product shape data. The effect that the property is obtained is achieved.

Further, according to the present invention, when creating a new structure (for example, a new mold structure) data corresponding to the new product shape data, the positional relationship from the feature point of the reference product shape is determined in advance. Reference structure created in (for example,
A reference structure (for example, a reference type structure) in which the position coordinate values of the feature points according to the data are replaced with the position coordinate values of the feature points according to the new product shape data, and the position coordinate values of the feature points are replaced. The reference type structure part) data is used as a new structure part (for example, a new type structure part) data. For this reason, the new structure part (for example, new mold structure part) data represents the positional relationship from the feature point in the new product shape part to a predetermined position of the new structure part (for example, new mold structure part). Since the data is automatically converted to data, the effect of greatly reducing the time required to create new structure (for example, a new type structure) data can be achieved. In other words, there is an advantage that the design resources can be effectively used.

Further, according to the present invention, a new product form
When trying to create new structure part data corresponding to new product shape data representing a shape part, the positional relationship between the feature points in the new product shape part and the new structure part is determined in the reference product shape part. Positional relationship between feature points and reference structure
To maintain, increase or decrease the only product shape portion, or so to scale the vertically and horizontally independently so that to create, as a new structural unit data, a reference structure data that has been created in advance As a The effect that it can be used as it is is achieved. When the positional relationship is described as a dimension or a relational expression, the configuration of data can be intuitively understood.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a CAD system to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram for explaining the contents of a program stored in the CAD system of FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the embodiment of the present invention;

FIG. 4 is a flowchart provided for detailed description of step S3 in the flowchart of FIG. 3;

FIG. 5 is a diagram provided for describing a reference die structure according to a reference product shape.

FIG. 6 is a diagram which is used for describing a dimensional description between a feature point and a mold structure (guide post).

FIG. 7 is a diagram which is used for describing a dimensional description between a feature point and a mold structure (cam).

FIG. 8 is a diagram which is used for describing a dimensional description between a feature point and a mold structure (urethane spring).

FIG. 9A is a diagram which is used for describing feature point generation in a new product shape and the like. FIG. 9B is a diagram illustrating feature points in the reference product shape at the same scale as FIG. 9A.

FIG. 10 is a diagram provided for describing a method for creating mold structure part data with a new product shape.

11A and 11B are diagrams for explaining a method of generating mold structure part data according to the present invention, wherein FIG. 11A is a diagram showing a state where feature points are generated on a product shape, and FIG. FIG. 11C is a diagram which is used for describing the description of the dimension of the mold structure with the point as a reference point, and FIG. 11C is a diagram which is used for describing the occurrence of a new mold structure corresponding to a new product shape.

FIG. 12 is a diagram provided for explanation of a conventional technique.

FIG. 13 is a diagram provided for description of a general CAD system.

[Explanation of symbols]

1, 1b (reference) mold structure 2, 2b, 95, 102 ... (reference) product shape molding part 3, 3b, 92, 94 ... (reference) mold structure part 4, 4b ... guide post 5, 5b, 91 ,
93: outline shape definition line 6, 6b, 7, 7b: door shape definition line 12: CAD system 61, 61b: cam 62, 62b: urethane spring 63, 63b: scrap cutter P1 to P11, P1b to P11b: feature point CPa , CPb, CPa ', CPb' ... characteristic points

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-4117 (JP, A) JP-A-4-137181 (JP, A) JP-A-3-123977 (JP, A) JP-A-2- 115978 (JP, A) JP-A-5-290104 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 17/50 JICST file (JOIS)

Claims (4)

(57) [Claims] [Claim 1] of the press mold product shape portion and the press die for structure comprising a structure corresponding thereto, the pre-creating design data of the structural part by the CAD system
In the method of creating the structural part data of the mold, the reference structural part data representing a positional relationship up to a predetermined position of the reference structural part is created using the positions of the plurality of feature points in the reference product shape part as reference points. a step, and creating a new structure data corresponding to a new product shape data representing the new product shape portion Yes
And, in the step of creating a new structure data, the new products of the coordinates of the reference point position of the reference structure data, corresponding to each of the plurality of feature points in the reference product shape portion A method of creating structure data of a press die , wherein the structure data is replaced with position coordinate values of feature points in a shape portion, and the reference structure data after replacement of reference point position coordinate values is used as the new structure data. . Wherein the positional relationship between the said new structure and feature points in the new product shape portion, is maintained the positional relationship between the feature points and the reference structure in the reference product shape portion, said flop according to claim 1, wherein only the product shape portion is enlarged or reduced, or the aspect is scaled independently
How to create the structure data of the less die . Wherein the positional relationship, according to claim 1 or 2, wherein the flop, characterized in that it is written in the dimensions or relations
How to create the structure data of the less die . 4. The product shape part is a product shape molding part,
The structure is the mold structure unit, the structure is the mold structure The method of creating structures data of the press die according to any one of claims 1 to 3, characterized in that.