JPH11175575A - Sheet metal model creating method in sheet metal cad/ cam system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an operator from performing repair correction, to use an expansion system and to perform expansion by executing various processing, referring to attribute information and sheet metal information which are added to a paper model of a sheet metal product. SOLUTION: Paper model and sheet metal model creating devices 15 and 27 read a paper model among paper models that are made a database, add attribute information about places to be bent, places to be cut and matching patterns and add sheet metal information about materials of sheet metal work, plate thickness and plate thickness direction. A part of the paper mode undergoes fillet processing and a surface that offsets as thick as the plate thickness in the direction of the plate thickness is produced. Matching interference processing which eliminates an interference part in each offset surface is performed about all adjacent offset faces to faces, considering matching pattern information. Plate thickness surface production processing which sequentially produces a plate thickness plane that connects a certain plane and an offset plane which corresponds to the plane at an appropriate position is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to computer aided design (CAD) systems and computer aided manufacturing (CA).
M) The present invention relates to a sheet metal CAD / CAM system configured to cooperate between systems and handle sheet metal products, and is particularly equivalent to a real model of a sheet metal product actually created through sheet metal processing based on a paper model of the sheet metal product. The present invention also relates to a sheet metal model creation method in a sheet metal CAD / CAM system capable of creating a sheet metal model that can be developed as it is by using an expansion system without performing rework correction by an operator.

[0002]

2. Description of the Related Art An example of a procedure for creating a sheet metal model from a paper model of a sheet metal product in a conventional sheet metal CAD / CAM system will be described with reference to FIGS. Here, the paper model refers to a surface model in which the sheet metal product is represented by a surface, and the sheet metal model refers to a surface model in which all surfaces including the outer surface, the inner surface, and the sheet thickness surface of the sheet metal product are three-dimensional. Refers to a solid model that is expressed generically.

First, offset planes are created for all the planes constituting the paper model shown in FIG. This offset plane is created by offsetting each plane inward by the thickness of all the planes constituting the paper model (FIG. 7B).
reference).

Next, interference processing is performed on all offset planes adjacent to each other. By this inter-plane interference processing,
The interference portion on each offset surface is removed (FIG. 8).
(A)).

[0005] Then, a sheet metal model is created by sequentially creating a sheet thickness surface connecting an outer surface and an offset surface corresponding to the outer surface at appropriate positions (FIG. 8).
(B)).

[0006]

However, in the above-described method of creating a sheet metal model in the conventional sheet metal CAD / CAM system, the sheet metal model created by using this method is directly expanded by using an expansion system. However, there is an inherent problem to be solved in that the created sheet metal model needs to be reworked and corrected by an operator before the development.

Here, the reason why the conventional sheet metal model cannot be developed as it is by using the developing system will be listed. In the conventional sheet metal model, for example, sheet materials adjacent to each other at a certain angle are independent of each other. In this case, the adjacent portions between the two plates will be abutted.However, if the abutting is not taken into consideration, and if the plates adjacent to each other at a certain angle are continuous, Adjacent portions between the plates are to be bent, but due to the lack of consideration for this bend, and the above-mentioned butt and bend not being taken into account, the plates adjacent to each other at an angle For example, the thickness of the connecting portion between them is not kept constant (see FIG. 8B).

[0008] In view of such circumstances, it is equivalent to a real model of a sheet metal product that is actually created through sheet metal processing based on a paper model. The development of a new method of creating a sheet metal model capable of creating an expandable sheet metal model has been awaited among the parties concerned.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is equivalent to a real model of a sheet metal product actually produced through sheet metal processing based on a paper model. It is an object of the present invention to provide a sheet metal model creation method in a sheet metal CAD / CAM system capable of creating a sheet metal model that can be developed as it is without using a development system.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 uses a computer-aided design (CA).
D) Sheet metal CAD which is configured in cooperation with the system and a computer assisted manufacturing (CAM) system and handles sheet metal products.
In the / CAM system, information addition that adds attribute information on a bent portion, a cut portion, and a butt pattern to a paper model of a sheet metal product, and also adds sheet metal information on a material, a sheet thickness, and a sheet thickness direction of the sheet metal work. A fillet processing step of performing a fillet process on the portion of the paper model to which the bending portion information has been added in the information adding step, and all the surfaces constituting the paper model after the fillet processing in the fillet processing step. As an object, an offset surface creating step of creating an offset surface by offsetting by the sheet thickness in the sheet thickness direction added in the information adding step, and the butting pattern information added in the information adding step are considered. hand,
For all adjacent offset planes, a butt interference processing step of removing an interference portion in each offset plane, and a plate thickness plane connecting a certain plane and an offset plane corresponding to this plane to an appropriate position And forming a sheet metal model based on a paper model of a sheet metal product.

According to the first aspect of the present invention, in the information adding step, attribute information on a bent portion, a cut portion, and a butt pattern is added to a paper model of a sheet metal product. Board thickness,
And sheet metal information relating to the sheet thickness direction.

In the fillet processing step, a fillet processing is performed on the portion of the paper model to which the bending portion information has been added in the information adding step.

In the offset plane creating step, all the faces constituting the paper model after the fillet processing in the fillet processing step are offset by the sheet thickness in the sheet thickness direction added in the information adding step. An offset plane is created.

In the butter interference processing step, interference portions in each offset plane are removed between all adjacent offset planes in consideration of the butting pattern information added in the information adding step.

Then, in a plate thickness surface forming step, a plate thickness surface connecting a certain surface and an offset surface corresponding to this surface is sequentially formed at an appropriate position.

The sheet metal model obtained through each of the above-described steps includes attribute information relating to a bent portion, a cut portion, and a butting pattern added to the paper model of the sheet metal product, and the material, sheet thickness, It is created precisely by executing various processes with reference to the sheet metal information in the sheet thickness direction and the sheet thickness information, and the bending and butting are taken into consideration, and the sheet thickness is kept constant even at the corner portion, for example. Therefore, it is equivalent to a real model of a sheet metal product that is actually created through sheet metal processing, and can be directly expanded using an expansion system without making a correction by an operator.

Further, by using the sheet metal model creating method according to the first aspect of the present invention, the modeling man-hour on the design side can be
In addition, it is possible to construct a sheet metal CAD / CAM system capable of greatly reducing both the number of man-hours for development on the manufacturing side.

Further, the invention of claim 2 is characterized in that the offset plane creating step further includes a plane dividing step of dividing the plane in accordance with the cut location information added in the information adding step.

Further, according to a third aspect of the present invention, in the plate thickness creating step, a boundary between a certain surface and an offset surface corresponding to this surface is searched, and a plate connecting the surfaces hit by this search is searched. The gist is to sequentially create thick surfaces at appropriate positions.

The invention of claim 4 is characterized in that the matching pattern information is configured to include at least a one-sided matching pattern and a double-sided matching pattern.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet metal CAD according to the present invention will be described below.
An embodiment of a sheet metal model creation method in the / CAM system will be described in detail with reference to the drawings.

FIGS. 1 to 4 are flowcharts showing schematic procedures of a sheet metal model creating method according to the present invention, and FIG.
FIG. 6 is a diagram showing a developed state of a sheet metal model created by using the sheet metal model creating method according to the present invention. FIG. 6 is a sheet metal CAD / CAM to which the sheet metal model creating method according to the present invention is applied.
It is a schematic block configuration diagram of a system.

First, FIG. 6 shows a sheet metal CAD / CAM system to which the sheet metal model creation method according to the present invention is applied.
The explanation will be given with reference to FIG.
D) Sheet metal CAD which is configured in cooperation with the system and a computer assisted manufacturing (CAM) system and handles sheet metal products.
The / CAM system 1 includes a CAD system 3 and a CAM system 5.

The CAD system 3 includes a three-dimensional design device (hereinafter referred to as “3D design device”) 7, a graphic display device 9 such as a graphic display, and a graphic device such as a keyboard connected to the 3D design device 7. Referring to the operation input device 11, the position input device 13 such as a mouse and a light pen, and CAD data including drawing information drawn by using the 3D design device 7, a paper model or a sheet metal model of a sheet metal product is created. Paper model / sheet metal model creation device 15
And a paper model / sheet metal model storage device 1 that stores the paper model and the sheet metal model created by the paper model / sheet metal model creating device 15 in a database and stores them.
7 are provided.

The CAM system 5 includes an NC processing data creation device 19 for creating NC processing data,
A graphic display device 21 such as a graphic display, a graphic operation input device 23 such as a keyboard, a position input device 25 such as a mouse and a light pen, and an NC processing data generating device 19 connected to the processing data generating device 19. Referring to the input CAD data, a paper model / sheet metal model creation device 27 for creating a paper model or a sheet metal model of a sheet metal product, and a sheet metal model created by the paper model / sheet metal model creation device 27 are developed and developed. The apparatus is provided with a sheet metal model automatic development device 29 for creating a drawing, and a paper model / sheet metal model storage device 17 for storing the paper model and the sheet metal model created by the paper model / sheet metal model creation device 27.

The paper model / sheet metal model storage device 17 is connected to a local area network, such as Ethernet or token ring, which connects the CAD system 3 and the CAM system 5 so as to exchange data with each other. , The CAD system 3 and the CAM system 5 can be shared and used. Thereby, the CAD system 3 and the CAM system 5
In both cases, access to the paper model and the sheet metal model stored in the database stored in the paper model / sheet metal model storage device 17 is permitted to access such as reading and writing of a corrected portion.

The NC processing data created by the NC processing data creation device 19 of the CAM system 5 is, for example, an NCT
It is supplied to a group of NC processing machines such as a processing apparatus 31, a laser processing apparatus 33, an NCT / laser combined processing apparatus 35, and a bending processing apparatus 37. In the NC processing machine group, cutting and punching of a sheet metal work according to the NC processing data are performed. It is configured to obtain a desired sheet metal product through sheet metal processing such as bending.

Next, a schematic procedure of a sheet metal model creation method in the above sheet metal CAD / CAM system will be described with reference to flowcharts shown in FIGS. Note that the sheet metal model creation method according to the present invention employs a sheet metal CAD /
It is executed by being applied to the paper model / sheet metal model creation devices 15 and 27 of the CAM system 1.

First, the paper model / sheet metal model creating devices 15 and 27 are, for example, FIG. 1 which is a target for creating a sheet metal model among the paper models stored in the database stored in the paper model / sheet metal model storage device 17.
Read the paper model shown in (a) (step S
1) Attach attribute information on a bent portion, a cut portion, and a butt pattern to the paper model read in step S1, and set the material,
An information adding process for adding sheet metal information relating to the sheet thickness and the sheet thickness direction is executed (step S2). The additional information includes fillet processing, offset plane creation processing, butting interference processing, creation processing of various shaped parts,
It is used as appropriate when calculating the elongation of a sheet metal work. FIG.
In the example of (b), bending point information is added to four ridgelines that define the outer periphery of the upper side surface of the paper model.

Next, the paper model / sheet metal model creating devices 15 and 27 perform a fillet process on the portion of the paper model to which the bending portion information has been added in step S2 (step S3). At this time, whether or not to add a plate thickness to a fillet to be created is automatically corrected based on the connection direction between the plate thickness direction and the adjacent surface. In the example of FIG. 2A, fillet processing is performed on four ridge lines that define the outer periphery of the upper surface of the paper model, in which an edge portion serving as a connection portion between mutually adjacent surfaces is rounded.

Further, the paper model / sheet metal model creating devices 15 and 27 apply the sheet thickness to the sheet thickness direction added in step S2 for all the surfaces constituting the paper model after the fillet processing in step S3. An offset plane is created by offsetting by an amount (step S4). At this time, the surface is divided according to the cutting location information added in step S2. FIG. 2 (b)
3 shows a state in which an offset plane is created for the right side of the paper model. In the example of FIG. 3A, an offset plane is created for all the planes constituting the paper model. FIG.

Next, the paper model / sheet metal model creating devices 15 and 27 take into account the butting pattern information added in step S2 and, for all the offset planes adjacent to each other, determine the interference part in each offset plane. A butter interference process for removal is executed (step S
5). Here, the butting pattern information will be described. A butting pattern is a pattern of a joined state between members when a pair of sheet metal members are butted at a certain angle. As this butting pattern, for example, one sheet metal is used. A one-sided butting pattern that joins sheet metal members so that the end surface of the member is covered by the general surface of the other sheet metal member, and a double-pull joining that joins the end surface of one sheet metal member and the end surface of the other sheet metal member at a ridge line portion facing Butting pattern.

In the butting interference process in step S5, specifically, attention is paid to each surface, interference calculation with the surrounding surface is performed, and an inner R (including R = 0) is added at this time. The interference calculation is performed on the side that is performing the operation. Here, in the sheet metal model, since the shape of the front and back surfaces sandwiching the plate thickness is the same, the result of the interference calculation is reflected on the surface with the outside R. FIG.
The example of (a) shows a state after the buttering interference processing when the double butting pattern is applied between the respective sides of the paper model.

The paper model / sheet metal model creating devices 15 and 27 sequentially create a thick surface connecting a certain surface and an offset surface corresponding to this surface at an appropriate position. Is executed (step S6). Specifically, this plate thickness surface creation processing searches for the boundary between a certain surface and the offset surface corresponding to this surface, and places the plate thickness surface connecting the surfaces hit by this search at an appropriate position. This is done by creating them sequentially.

The sheet metal model obtained through the above steps is added to the paper model of the sheet metal product.
It is created precisely by performing various processes while referring to the attribute information about the bent part, the cut part, and the butting pattern, and the material, thickness, and sheet metal information of the sheet metal work, and, moreover, Since bending and butting are taken into consideration, and the thickness of the sheet is kept constant, for example, even at the corners, it is equivalent to a real model of a sheet metal product actually created through sheet metal processing, as shown in FIG. In addition, the image data can be directly developed using the data development system without the need for the operator to make corrections.

Further, by using the sheet metal model creation method according to the present invention, a sheet metal CAD / CAM system capable of greatly reducing both the man-hours for modeling on the design side and the man-hours for deployment on the manufacturing side is constructed. Can be.

It is needless to say that the present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0038]

As described above in detail, according to the first aspect of the present invention, the sheet metal model obtained by applying the method of the present invention is formed by adding a bending to the paper model of the sheet metal product. It is created precisely by executing various processes while referring to the attribute information on the location, the cutting location, and the butting pattern, and the sheet metal information on the material, thickness, and thickness direction of the sheet metal work, and is bent precisely. Since the sheet thickness is kept constant even at, for example, the corners, it is equivalent to the actual model of the sheet metal product actually created through sheet metal processing, and the operator makes a correction correction. It can be deployed as is using the deployment system without any modification.

Further, by using the sheet metal model creating method according to the first aspect of the present invention, the number of modeling steps on the design side is reduced.
And a sheet metal CAD / CAM system capable of significantly reducing both the man-hours for development on the manufacturing side and the sheet metal CAD / CAM system.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a schematic procedure of a sheet metal model creating method according to the present invention.

FIG. 2 is a flowchart illustrating a schematic procedure of a sheet metal model creating method according to the present invention.

FIG. 3 is a flowchart illustrating a schematic procedure of a sheet metal model creating method according to the present invention.

FIG. 4 is a flowchart illustrating a schematic procedure of a sheet metal model creating method according to the present invention.

FIG. 5 is a diagram showing a state in which a sheet metal model created by using the sheet metal model creating method according to the present invention is developed.

FIG. 6 is a schematic block configuration diagram of a sheet metal CAD / CAM system to which a sheet metal model creation method according to the present invention is applied.

FIG. 7 is a diagram for explaining a sheet metal model creating method according to a conventional example.

FIG. 8 is a diagram for explaining a sheet metal model creating method according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 sheet metal CAD / CAM system 3 CAD system 5 CAM system 7 3D design device 9 graphic display device 11 graphic operation input device 13 position input device 15 paper model / sheet metal model creating device 17 paper model / sheet metal model storage device 19 NC processing data creation Device 21 Graphic display device 23 Graphic operation input device 25 Position input device 27 Paper model / sheet metal model creation device 29 Sheet metal model automatic development device 31 NCT processing device 33 Laser processing device 35 NCT / laser combined processing device 37 Bending device

Claims (4)

[Claims] 1. A sheet metal CAD / CAM system configured to link a computer assisted design (CAD) system and a computer assisted manufacturing (CAM) system for handling sheet metal products. An information adding step of adding sheet metal information relating to a material, a sheet thickness, and a sheet thickness direction of the sheet metal work, while adding attribute information regarding the cutting position and the butting pattern; and the bending point information added in the information adding step. A fillet processing step of performing a fillet processing on a portion of the paper model; and a direction in which the sheet thickness direction added in the information adding step is applied to all surfaces constituting the paper model after the fillet processing in the fillet processing step. Offset to create an offset surface by offsetting A butt interference processing step of removing an interference portion in each offset plane between all adjacent offset planes in consideration of the butt pattern information added in the information adding step; A sheet thickness creating step for sequentially creating a sheet thickness face connecting the offset face corresponding to this face at an appropriate position, and creating a sheet metal model based on a paper model of the sheet metal product. Sheet metal CAD /
A method of creating a sheet metal model in a CAM system. 2. The sheet metal CAD / CAM system according to claim 1, wherein the offset plane creating step further includes a plane dividing step of dividing the plane in accordance with the cut location information added in the information adding step. How to create a sheet metal model. 3. The board thickness creating step searches for a boundary between a certain face and an offset plane corresponding to the face, and places the board thickness plane connecting the faces hit by this search at an appropriate position. The sheet metal model creation method in the sheet metal CAD / CAM system according to claim 1, wherein the sheet metal model is created sequentially. 4. The sheet metal model creation in the sheet metal CAD / CAM system according to claim 1, wherein the matching pattern information includes at least a one-sided butting pattern and a double-sided butting pattern. Method.