JP2002001460A - Cad/cam system for designing press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a CAD/CAM system having an offset deforming function performing an automatic design of an escape hole, in which a diameter of a tool is considered in advance, so as not to have any non-grinding portions at each corner of the escape hole when the escape hole of the press die is processed by using the offset deforming function of the CAD/CAM system. SOLUTION: The CAD/CAM system for designing the press dies is provided with an automatic escape hole designing process in which an escape hole 1 is automatically designed in consideration of a diameter of a tool processing the escape hole 1 so as not to have any non-grinding portions therein in processing the escape hole 1 of the press die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD / C used for designing a relief hole to be formed in a plate of a press die.
Regarding the AM system.

[0002]

2. Description of the Related Art A CAD / CAM system is used to design a plate constituting a press die. By the way, in order to punch a member using a press die and to provide a desired press hole in the member, first set the member in the press die, and then, from above, a punching tool (hereinafter simply referred to as “punching tool”). ) Is punched down on the member to punch out the member. At this time, in order to remove the removed member from the press die, the receiving die set below the member generally has a relief. It is necessary to make a hole called a hole, which is larger than the punching tool.

[0003] The relief hole of the receiving mold is usually formed by CAD /
It is designed using the offset deformation function provided in the CAM system. Hereinafter, a method of designing the relief hole will be briefly described with reference to FIG.

It is assumed that a figure X shown in FIG. 5A is punched out by press working. First, the outline 50 of this figure X is decomposed into a plurality of constituent lines 51a, 51b,..., 51g, and a predetermined offset length x of each constituent line 51 is used for the CAD / CAM system. Offset lines 52a, 52b,
(FIG. 5B). Next, for each of the created offset lines 52, for example, offset lines 52a, 52
When two adjacent offset lines 52 do not have an intersection as in b, as shown in FIG. 5C, an arc having the same radius y as the preset offset amount x is formed as shown in FIG.
It is inserted between the offset lines 52a and 52b and these are connected. When two adjacent offset lines 52 have an intersection, for example, as in the case of the offset lines 52c and 52d, the portion is referred to as the respective offset lines 52c and 52d.
At the end of Such a method is performed using a CAD / CAM system to design the relief hole 60 of the press die (FIG. 5D).

[0005]

By the way, the relief hole 60 of the press die designed as described above is usually processed by using a machining center. If the tool of the machining center used at this time does not enter the arc portion (see FIG. 5C) of the relief hole 60 created by the above-described method, an uncut portion 70 is generated in the designed relief hole 60. .

This will be described in detail with reference to FIG. 6. For example, in designing the relief hole 60, CAD / CAM
When the offset amount is set to 3 mm for the system, the radius of the arc portion becomes 3 mm in the above-described processing of the relief hole 60. On the other hand, if the radius of the tool of the machining center is 8 mm, as shown in FIG. 6, the tool cannot be inserted into the corner of the relief hole 60, that is,
This part cannot be cut off, resulting in an uncut part 70.

Therefore, the relief hole 60 cannot have the size as designed in this case, that is, the relief hole 60
Does not work well, so conventional CAD / CAM
In the machining by the system, the designer once designs the relief hole 60 so that the uncut portion 70 is not formed, and then, for the portion where the tool cannot be inserted, in order to make the size into which the tool can be inserted, one by one. It was necessary for the designer to make corrections directly on the corners, but this was problematic in that it took a long time to design, and there were portions where corrections were forgotten.

Accordingly, the present invention has been made in view of such a problem, and an object of the present invention is to use the offset deformation function of a CAD / CAM system when machining a relief hole of a press die. An object of the present invention is to provide a CAD / CAM system having an offset deformation function for automatically designing a relief hole in consideration of the diameter of a tool in advance so that no uncut portion is left at each corner of the relief hole. .

[0009]

In order to achieve the above object, a CAD for designing a press die according to claim 1 of the present invention.
/ CAM system, CAD / CA for press die design
In the M system, a relief hole automatic design step of automatically designing the relief hole in consideration of the diameter of a tool for processing the relief hole so as not to cause uncut when machining the relief hole of the press die. That it is provided.

According to a CAD / CAM system for designing a press die according to a second aspect of the present invention, in the CAD / CAM system for designing a press die according to the first aspect, the automatic relief hole designing step includes the steps of: Decomposing the outline forming the figure punched out by the mold into a plurality of component lines, offsetting the component lines outward to create an offset line, and among the offset lines created in the offset step, An intersection creating step of selecting two adjacent offset lines and virtually extending one end of each of the two offset lines to create an offset line intersection;
A connection line creation step of creating an intersection connection line connecting the offset line intersection and a component line intersection that is an intersection of two component lines based on the two offset lines, and centering on the offset line intersection, A virtual circle creating step of creating a virtual circle having the same diameter as the diameter of the tool, and the virtual circle created in the virtual circle creating step is reduced by a preset relief amount to the center of the virtual circle. Among the contact points between the virtual circle and the intersection connection line after moving in the circle center movement step of moving along the intersection connection line.
A circle insertion step of inserting a circle having the same diameter as the diameter of the tool as a new center at the intersection point closer to the component line intersection, a circle formed by the circle insertion step and the offset line, And a trimming step of trimming.

According to a CAD / CAM system for designing a press die according to a third aspect of the present invention, in the CAD / CAM system for designing a press die according to the first or second aspect,
When the area of the relief hole designed by the automatic relief hole designing step is smaller than the cross-sectional area of the tool, the shape of the relief hole is set to the cross-sectional shape of the tool.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment shown here is merely an example, and is not necessarily limited to this embodiment.

(Embodiment 1) First, a CAD / CAM system for designing a press die according to the present invention will be described as a first embodiment with reference to the drawings. The CAD / CAM system for press die design according to the present embodiment processes relief holes of the press die when designing the press die using the CAD / CAM system as described in the related art. The present invention is provided with a relief hole automatic design process for automatically designing a relief hole in consideration of a diameter of a tool for processing the relief hole so that sometimes uncut portions are not generated.

Therefore, a brief description will be given of an automatic design process of a relief hole provided in the CAD / CAM system. However, the following description is an example, and an uncut portion is formed when machining a relief hole of a press die. The method is not limited to this as long as it does not occur.

The relief hole 1 for the figure A shown in FIG. 1 will be described. As shown in FIG. 2, first, the outline 10 constituting the figure A is divided into a plurality of constituent lines 11a, 11b,.
Decomposes to 11h. Next, each component line 11 is offset outward, and offset lines 12a, 12b,.
Create At this time, an arbitrary amount of offset is input in advance to the CAD / CAM system.

When the above-described offset step is completed, as shown in FIG. 3, two adjacent offset lines, for example, the offset line 12
a, 12b, and each offset line 12a,
12b, one end of which is virtually extended, the offset line intersection 13
Create

When this intersection creation step is completed, a component line intersection 14, which is an intersection of the offset line intersection 13 and the component lines 11a and 11b on which the offset lines 12a and 12b are based.
Is created.

When the connecting line forming step is completed, as shown in FIG. 4, an imaginary circle having the same diameter as the diameter of the tool used for forming the relief hole of the press die is formed around the offset line intersection 13. Create 16

When this virtual circle creating step is completed, the created virtual circle 16 is reduced by a predetermined amount of escape.
The center of the virtual circle 16 is moved along the intersection connecting line 15,
A virtual circle 16 'is created. The virtual circle 16 created here is exactly the same as the cross-sectional shape of the tool as described above, and if it is left as it is, no error is allowed in the actual machining operation. For example, even if the position of the tool is slightly shifted, the punching operation may not be performed. Therefore, in order to allow a certain amount of error, it is preferable that the virtual circle 16 has a certain margin, and a numerical value set in advance for this purpose is a so-called escape amount.

When this circle center moving step is completed, the virtual circle 1
A circle 18 having the same diameter as that of the tool for processing the press die, with the contact 17 between the component line 6 ′ and the component line intersection 14 being closer to the component line intersection 14 as a new center.
Insert When the circle inserting step is completed, the formed circle 18 and the offset lines 12a and 12b are trimmed.

Although the processing described above is for the case where two adjacent offset lines 12 do not intersect, the case where two adjacent offset lines 12 intersect is the same as described in the prior art. Similarly, the part is set to offset line 1
2 end. When this trimming process is completed, that is, the automatic relief hole design process is completed,
The relief hole 1 of the press die is designed in consideration of the diameter of the tool.

Conventionally, the designer of the press mold has a CAD /
Even if the relief shape of the tool was designed using the offset function of the CAM system, the shape could be modified on site because it could not be machined on site, but as described above, the CAD for press die design in this embodiment was used. In the case of the CAD / CAM system, the CAD / CAM system is provided with an automatic relief hole designing process, so the press mold designer can use the conventional CAD / C
With the same feeling as using the offset function of the AM system, it is possible to automatically design a relief hole that eliminates tool interference in advance.

If the area of the figure of the relief hole designed by the above-described automatic relief hole design process is smaller than the cross-sectional area of the tool used for processing the press die,
If the shape of the relief hole is the cross-sectional shape of the tool, that is, a circle, the relief hole can be automatically machined even when machining with this tool is impossible.

[0024]

As described above, according to the CAD / CAM system for designing a press die according to the first aspect of the present invention,
Equipped with a relief hole automatic design process that automatically designs the relief hole considering the diameter of the tool that processes the relief hole, the relief hole shape that does not leave uncut when machining the relief hole of the press die is automatically The CAD / CAM system for press mold design is very easy to use and is very easy to use.

According to the CAD / CAM system for designing a press die according to the second aspect of the present invention, an offset step of offsetting constituent lines constituting a figure to be punched by the press die to form an offset line; An intersection creation step of selecting two offset lines to create an offset line intersection, a connection line creation step of creating an intersection connection line connecting the offset line intersection and the component line intersection, and having a tool centering on the offset line intersection An imaginary circle creating step of creating an imaginary circle having the same diameter as the diameter, a circle center moving step of moving the center of the imaginary circle until the imaginary circle comes into contact with the constituent line intersection, and a contact point between the imaginary circle and the constituent line intersection Inserting a circle having the same diameter as that of the tool with a new center as the new center, and trimming the circle formed by the circle inserting step and the offset line Since the press mold designer inputs the tool diameter, a relief hole is automatically designed so that the tool diameter does not interfere, so the press mold is easier to use. It can be a CAD / CAM system for mold design.

According to the CAD / CAM system for designing a press die according to the third aspect of the present invention, if the area of the relief hole designed by the automatic relief hole designing process is smaller than the cross-sectional area of the tool, the relief is performed. Since the shape of the hole is the cross-sectional shape of the tool, that is, a circle, the relief hole can be automatically machined even when machining with this tool is not possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a relief hole designed in a CAD / CAM system according to the present embodiment.

FIG. 2 is a diagram showing an example of a method of drawing an offset line designed in the CAD / CAM system according to the present embodiment.

FIG. 3 is a diagram illustrating an example of a drawing method of an offset line intersection and an intersection connection line in the CAD / CAM system according to the present embodiment.

FIG. 4 is a diagram showing an example of drawing near an offset line intersection in the CAD / CAM system according to the present embodiment.

FIG. 5 is a diagram showing an example of a relief hole designed in a conventional CAD / CAM system.

FIG. 6 is a diagram showing uncut portions generated by a conventional method.

[Explanation of symbols]

 A Press Hole Figure 1 Relief Hole 10 Outline Line 11 Component Line 12 Offset Line 13 Offset Line Intersection 14 Component Line Intersection 15 Intersection Connection Line 16 Virtual Circle 16 'Virtual Circle 17 Contact 18 Circle X Press Hole Graphic 50 Outline 51 Configuration Line 52 Offset line x Offset amount y Radius of circle 60 Relief hole 70 Uncut portion

Claims (3)

[Claims] 1. A CAD / CAM system for designing a press die, wherein said relief is formed in consideration of a diameter of a tool for processing said relief hole so that no uncut portion is left when machining the relief hole of said press die. A CAD / CAM system for designing press dies, characterized by having an automatic hole designing process and a relief hole automatic designing process. 2. The CA for press die design according to claim 1.
In the D / CAM system, the relief hole automatic design process includes the steps of: decomposing an outline forming a figure punched by a press die into a plurality of constituent lines, and offsetting the constituent lines outward to form an offset line. And an intersection creation step of selecting two adjacent offset lines from among the offset lines created in the offset step, and virtually extending one end of each of the two offset lines to create an offset line intersection. A connection line creation step of creating an intersection connection line connecting the offset line intersection and a component line intersection that is the intersection of the two component lines on which the two offset lines are based; A virtual circle creation step of creating a virtual circle having the same diameter as the diameter of the tool, and a virtual circle created in the virtual circle creation step, A circle center moving step of moving the center of the virtual circle along the intersection connecting line by the escape amount set in advance, and a step of moving the virtual circle and the intersection connecting line after moving in the circle center moving step. A circle insertion step of inserting a circle having the same diameter as the diameter of the tool with the intersection point closer to the component line intersection as a new center among the contact points, and a circle formed by the circle insertion step and And a trimming step of trimming the offset line and a CAD / CAD for press die design.
CAM system. 3. The CAD / CAM system for designing a press die according to claim 1, wherein the area of the relief hole designed in the relief hole automatic design step is smaller than a cross-sectional area of the tool. A CAD / CAM system for press die design, wherein the relief hole has a cross-sectional shape of the tool.