JPH04361380A - Molded part designing device - Google Patents

Abstract

PURPOSE:To supply a molded part designing device which can automatically perform chamfering work considering the releasing property of metallic mold for a basic drawing being design data. CONSTITUTION:This device is provided with a setting part 12 setting a value of radius of curvature to chamfer a connection part between respective reference surfaces included in the basic drawing, a name manufacturing part 14 adding identification names to a reference surface and a bending surface, a connection information preparing part 15 preparing connection information of the bending surface and the reference surface, both of which are added with the identification names, an intersection angle operating part 16 calculating the intersection angle of two connected reference surface, a chamfering identification part 17 identifying the connection part of the two reference surfaces to be subjected to chamfering when the intersection angle is over a previously set value and a chamfering processing part 18 chamfering the connection part of the two basic surfaces by the chamfering processing part 17 with the value of radius of curvature.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a molded product design device.
More specifically, it is applied to the field of CAD systems using computers for designing injection molded products and the like.

0002

2. Description of the Related Art In graphic creation devices such as CAD systems, which are widely used to reduce the time required for graphic creation, when creating a graphic, it is necessary to input simple shapes such as curves, arcs, points, etc. Now, drawings can be created by combining them.

In the case of parametric design, each figure is created, modified, etc. by inputting individual figure parameters such as radius, length, and rotation angle.

0004

By the way, one of the operations when creating a molded product model from a basic drawing, which is design data, is a chamfering operation that takes into consideration the releasability of the mold. That is, when the corner portion (connection portion) of two connected basic surfaces forms an acute angle, this work is to form this corner portion into a curved surface.

However, in the above-mentioned conventional system, since each figure exists independently, it is necessary for the operator to perform chamfering work individually while looking at the drawing. Also,
When chamfering is performed, unnecessary surfaces are always created, so it is necessary to correct these unnecessary surfaces, which not only increases the amount of operation for the operator but also becomes a troublesome task. Furthermore, there is a problem in that human errors are more likely to occur due to the increased amount of operations.

The present invention has been made in view of the above circumstances, and its purpose is to provide a molded product design device that can automatically perform a chamfering operation in consideration of mold releasability on a basic drawing that is design data. Our goal is to provide the following.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the molded product design device of the present invention is a figure creation system that creates a molded product model from a basic drawing that is design data. a setting means for setting a radius of curvature value for chamfering a connecting portion between each basic surface;
a first name creation means for creating an identification name for each basic surface included in the basic drawing; and a first name creation means for creating connection information of each basic surface to which an identification name has been added by the first name creation means. a connection information creation means, an intersection angle calculation means for calculating an intersection angle between two connected basic planes among the respective basic planes, and an intersection angle that is preset based on the intersection angle calculated by the intersection angle calculation means. a chamfer identification means for identifying that the connecting portion of the two basic surfaces is to be chamfered when the value exceeds the specified value; A chamfering means for chamfering with a set radius of curvature value, a second name creating means for creating an identification name on a curved surface newly created by the chamfering means, and a second name creating means for creating an identification name on a curved surface newly created by the chamfering means. The present invention is configured to include second connection information creation means for creating connection information between the curved surface to which the identification name is added and the two basic surfaces modified by the chamfering processing means.

[0008]

[Operation] The setting means presets the radius of curvature value for chamfering the connection portion between each basic surface included in the basic drawing.

The name creation means creates and adds an identification name to each basic surface included in the basic drawing, which is the given design data. Then, the connection information creation means creates connection information for each basic plane to which the identification name has been added by the name creation means. For example, information such as that the basic surface "Surface 1" and the basic surface "Surface 2" are connected by the side "Side 1" is created.

On the other hand, the intersection angle calculation means calculates the intersection angle between two connected basic surfaces among the basic surfaces included in the basic drawing that is the given design data. For example, the normal vector of each basic surface is calculated, and the angle formed by the normal vectors of two connected basic surfaces (intersection angle) is calculated.

[0011] Based on the intersection angle calculated by the intersection angle calculation means, the chamfer identification means determines whether the intersection angle is equal to or greater than a preset value (for example, 30 degrees) at the connecting portion of the two basic surfaces. Identifies as being chamfered.

The chamfer processing means chamfers the connecting portion of the two basic surfaces identified by the chamfer identification means using the radius of curvature value set by the setting means, and uses the surface data of the newly created curved surface. Add as an attribute. Furthermore, the chamfering processing means modifies the surface data of the two basic surfaces modified by performing the chamfering, and resets this data as an attribute.

The second name creation means creates and adds an identification name to the curved surface newly created by the chamfer processing means.

The second connection information creation means creates connection information between the curved surface to which the identification name has been added by the second name creation means and the two basic surfaces modified by the chamfering processing means. In other words, the basic surface “plane 1′
'' and the basic surface "surface 2'" are connected by the curved surface "surface 3".

That is, by using the modified surface data of the two basic surfaces, the newly created surface data of the curved surface, and the connection information created by the second connection information creation means, for example, an image on the screen of the display device is displayed. The basic drawing, which is design data with chamfers, will be automatically displayed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the electrical configuration of the molded product design apparatus of the present invention.

In the figure, a data input section 1 is used to input each basic surface data constituting the basic drawing, which is design data.
1 and the output of the setting unit 12 which sets the radius of curvature value R for chamfering the connecting parts between the basic planes constituting the basic drawing, are output by the main control unit 1 which controls the operation of the entire device.
It is guided by 3.

A name creation section 14, a connection information creation section 15, an intersection angle calculation section 16, a chamfer identification section 17, and a chamfer processing section 18 are bidirectionally connected to the main control section 13. The unit 13 outputs data of the basic drawing with chamfering to the data output unit 19.

The name creation section 14 adds an identification name to each basic surface included in the basic drawing input from the data input section 11, and also adds an identification name to a curved surface, which will be described later.

For example, identification names are sequentially added such as "Surface 1" to one basic surface, "Surface 2" to another basic surface, "Surface 3" to one curved surface, and so on.

[0022] The connection information creation unit 15 includes the name creation unit 1
4 creates connection information for each basic surface to which an identification name has been added, and also creates connection information between a curved surface to which an identification name has been added and two basic surfaces connected by this curved surface by the name creation section 14. do.

For example, information is created such that one basic surface "Surface 1" and another basic surface "Surface 2" are connected by one side "Side 1". In addition, one basic surface “Surface 1”
'' and another basic surface 'surface 2' are connected by a curved surface 'surface 3'.

The intersection angle calculation unit 16 calculates the intersection angle between two connected basic surfaces among the basic surfaces included in the basic drawing that is the given design data (surface data).

For example, the normal vector of each basic surface is calculated, and the angle formed by the normal vectors of two connected basic surfaces (intersection angle) is calculated.

Based on the intersection angle calculated by the intersection angle calculation section 16, the chamfer identification section 17 identifies the connecting portion of the two basic surfaces when the intersection angle is greater than a preset value (for example, 30 degrees). It is identified as having a chamfer applied to it.

The chamfer processing section 18 chamfers the connecting portion of the two basic surfaces identified by the chamfer identification section 17.
This is done using the radius of curvature value R set in advance by the setting unit 12, and the surface data of the newly created curved surface is added as an attribute. Furthermore, the chamfering processing unit 18 modifies the surface data of the two basic surfaces modified by performing chamfering, and resets this as an attribute.

The data output section 19 includes a chamfer processing section 18.
The surface data of the two basic surfaces modified by the surface data of the newly created curved surface, and the connection information creation unit 1
5 is given basic drawing data including connection information between two basic surfaces and one curved surface, and if a display device is connected to the data output unit 19, the display screen will be displayed. A basic drawing, which is design data with chamfers, will be displayed. Furthermore, if a printing device is connected to the data output unit 19, a basic drawing, which is design data with chamfers, is printed on drafting paper or the like.

FIG. 2 shows an example of a basic drawing that is design data.

This basic drawing has a configuration in which two basic planes are connected orthogonally.

Hereinafter, the procedure for chamfering this basic drawing in consideration of mold releasability will be explained with reference to FIGS. 2 to 5.

First, two basic surface data constituting the basic drawing shown in FIG. 2 are input from the data input section 11. In the name creation unit 14, these two basic surfaces are assigned "Surface 1" and "Surface 2".
”Create and add an identification name.

Thereafter, the connection information creation section 15 creates connection information for each of the basic surfaces "Surface 1" and "Surface 2" to which identification names have been added by the name creation section 14.

That is, the basic surface "surface 1" and the basic surface "surface 2"
” creates information such that the edges are connected by the edge “edge 1”.

On the other hand, the intersection angle calculation unit 16
Each basic surface "surface 1", "surface 1", "
Calculate the normal vector of "Surface 2" (indicated by an arrow in Figure 3), and calculate the angle formed by the normal vectors of the calculated basic surfaces "Surface 1" and "Surface 2" (intersection angle θ). do.

After that, the chamfer identification unit 17 compares the calculated intersection angle θ (=90 degrees) with a preset value (for example, 3
0 degree), and if the intersection angle θ>30 degrees, it is determined that the connecting portion of the two basic surfaces "surface 1" and "surface 2" is to be chamfered. In this example, since the intersection angle θ is 90 degrees, the basic surfaces "surface 1" and "surface 2"
The connecting part is identified as being chamfered.

As shown in FIGS. 4 and 5, the chamfering processing section 18 processes the connecting portion (of the side "side 1") between the two basic surfaces "surface 1" and "surface 2" identified by the chamfer identification section 17. The chamfering of the basic surface "surface 1" and the basic surface "surface 2" is performed using the radius of curvature value R set in advance by the setting unit 12.
A new curved surface (indicated by a broken line in FIG. 4) is created at the connection with ", and the surface data is added as an attribute. Thereafter, the connection portions (indicated by broken lines in FIG. 5) that are no longer needed due to the creation of the curved surfaces are cut out.

The name creation unit 14 adds the identification name of "Surface 3" to this new curved surface as an attribute.

The chamfer processing unit 18 also modifies the surface data of the two basic surfaces corrected by chamfering, and changes the identification names from "surface 1" and "surface 2" to "surface 1'". , "surface 2'" and reset these as attributes.

Thereafter, the connection information creation section 15 creates the curved surface "Surface 3" to which the identification name has been added by the name creation section 14.
", and the two basic surfaces "surface 1'" and "surface 2'" connected by this curved surface "surface 3" are created.

That is, information is created that the basic surface "surface 1'" and the basic surface "surface 2'" are connected by the curved surface "surface 3."

The basic drawing data in which each basic surface data and connection information have been corrected and chamfered as described above is output to the data output section 19.

Therefore, if a display device is connected to the data output section 19, the basic drawing, which is design data with chamfers, will be displayed on the display screen. Further, if a printing device is connected to the data output unit 19, a basic drawing, which is design data with chamfers, is printed on the drawing paper.

[0044] In the above embodiment, data on the radius of curvature R is provided from the setting section 12, but this data may also be entered by the operator from a keyboard or the like during chamfering work. .

Furthermore, in the embodiment described above, it is possible to prepare a plurality of radius of curvature values set by the setting section 12 and to use an appropriate radius of curvature value depending on the intersection angle.

[0046]

[Effects of the Invention] The molded product design device of the present invention has two connected basic surfaces included in a basic drawing that is design data.
The intersection angle of the two basic surfaces is calculated, and if the intersection angle exceeds a preset value, the connecting portion of the two basic surfaces is identified as being chamfered, and the identified connecting portion of the two basic surfaces is Since the chamfering is performed based on the radius of curvature value R set by the setting means, it is possible to automatically create a drawing in which necessary parts of the basic drawing, which is design data, are chamfered. This eliminates the enormous amount of operations required by the operator to chamfer the basic drawing, which is design data, and also prevents the occurrence of human input errors.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of a molded product design apparatus of the present invention.

FIG. 2 is a diagram showing an example of a basic drawing that is design data.

FIG. 3 is a diagram illustrating a procedure for chamfering the basic drawing shown in FIG. 2;

FIG. 4 is a diagram illustrating a procedure for chamfering the basic drawing shown in FIG. 2;

FIG. 5 is a diagram illustrating a procedure for chamfering the basic drawing shown in FIG. 2;

[Explanation of symbols]

11 Data input section 12 Setting section 13 Main control section 14 Name creation department 15 Connection information creation department 16 Intersection angle calculation section 17 Chamfer identification part 18 Chamfering processing section 19 Data output section

Claims (1)

[Claims] [Claim 1] A figure creation system that creates a molded article model from a basic drawing that is design data, the system setting a radius of curvature value for chamfering the connection portion between each basic surface included in the basic drawing. a setting means, a first name creation means for creating an identification name for each basic surface included in the basic drawing, and creating connection information of each basic surface to which an identification name has been added by the first name creation means. a first connection information creation means for calculating the intersection angle of two connected basic planes among the respective basic planes, and an intersection angle calculation means for calculating the intersection angle between two connected basic planes,
a chamfer identification means for identifying that the connecting portion of the two basic surfaces is to be chamfered when the intersection angle exceeds a preset value; and a connecting portion of the two basic surfaces identified by the chamfering identification means a chamfering processing means for chamfering using the radius of curvature value set by the setting means; a second name creation means for creating an identification name for the curved surface newly created by the chamfering processing means; The curved surface to which an identification name has been added by the name creation means 2 and the curved surface 2 modified by the chamfering processing means.
A molded product design device comprising: second connection information creation means for creating connection information with two basic surfaces.