JPH05151322A - Automatic generating method for development for bending - Google Patents

Abstract

PURPOSE:To easily generate a development even in the case of other articles than a rectangular parallelopiped. CONSTITUTION:A reference shape being the shape of one principal surface of the articles is plotted by dimensions of a fixed measure to finish dimensions (step S1). Also, from plural kinds of bending shape patterns registered in advance as a cross sectional shape of the part to which bending is performed, a desired bending shape pattern is selected (step S2). To the selected bending shape pattern, dimensions of each part are given by finish dimensions (step S3). The material of a sheet metal to which bending is performed and its plate thickness are inputted (step S4). With reference to a first development (step S5) in which the reference shape and the bending shape are coupled (step S5), a correction is performed so that bent pieces are not overlapped and a second development is obtained (step S6). Based on the material of the sheet metal and its plate thickness, elongation dimensions of the bending part are derived (step S7), and dimensions of a second development are corrected (step S8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically creating a bending development drawing for accurately setting the dimensions of each portion of the development drawing required for bending processing based on the finished dimensions.

[0002]

2. Description of the Related Art Generally, when a product is obtained by bending, a development view is required. On the other hand, with the automation of processing, attempts have been made to automatically create a development drawing of this kind by CAD. For example, JP-A-63-130220
In the invention described in the publication, in order to form a box-shaped product, as shown in FIG. 18, a schematic cross-sectional shape in both vertical and horizontal directions of the sheet metal and dimensions H _{1 to} H ₃ and W _{1 to} W of each part.
By inputting ₃ and, if necessary, the material and thickness of the sheet metal, as shown in FIG. 19, the development view D is automatically adjusted with the sheet thickness of the sheet metal and the extension of the bent portion corrected. It is designed to be created in. Regarding the overlap at the abutting portion, the notch shape of the corner portion is determined according to the shape of the abutting portion by selecting a desired shape from a plurality of types of abutting patterns registered in advance. ..

[0003]

By the way, in the above-mentioned conventional configuration, since the dimensions and bending shape of each part are input only in both the vertical and horizontal directions of the sheet metal, only a development view of a box-shaped product formed in a rectangular parallelepiped shape is provided. There is a problem that it cannot be formed. That is, a development view D for a product whose bottom surface is not a square or a rectangle as shown in FIG.
Also, there is a problem that the conventional method cannot be applied to the product P which is not in the box shape as shown in FIG.

An object of the present invention is to solve the above problems, and to provide a method for automatically creating a development drawing for bending so that a development drawing can be easily created even for products other than a rectangular parallelepiped. It is what

[0005]

In order to achieve the above object, in the invention of claim 1, the process of drawing with a constant scale dimension to the finish dimension with the shape of the main part of the product as a reference shape, and the bending process are performed. The process of selecting a desired bending shape pattern from multiple types of bending shape patterns registered in advance as the cross-sectional shape of the portion to be applied, the step of giving the dimensions of each part to the bending shape pattern by the finish dimension, and the bending process. The process of inputting the material and plate thickness of the sheet metal to be subjected to the process, the process of connecting the bent pieces corresponding to the bending shape pattern to each side of the reference shape to create the first developed view, the first developed view and the bending process. After that, a process of creating a second development view in which the first development view is corrected so that overlapping parts are not formed between the bent pieces, and a process of obtaining an extension dimension of the bent portion based on the material and plate thickness of the sheet metal , First on the basis of the extended dimensions determined 2
The process of correcting the dimensions given to the developed view to obtain the desired developed view is provided.

In the invention of claim 2, the reference shape is drawn by a three-dimensional drawing. In the invention of claim 3, the reference shape is drawn according to the stereoscopic drawing method. In the invention of claim 4, a process of determining whether the reference shape includes a curved surface,
When a curved piece is included and the bent piece is bent along the curved surface, a process of determining whether the bent piece is to be integrally developed or to be separately developed is added according to the bending amount.

[0007]

According to the method of claim 1, the shape of the main part of the product is drawn as a reference shape, and a desired bending shape is selected from a plurality of bending shape patterns which are the sectional shapes of the portion to be bent. A pattern is selected, a dimension is given according to a finishing dimension, and a developed pattern of the product is obtained by combining the reference shape and the selected bent shape pattern. That is, if a reference shape is drawn and a bending shape pattern is selected, it is possible to easily create a development drawing for products of various shapes. Further, since the dimension is given to the bent shape pattern, it is possible to easily deal with the case where the product thickness dimension or the like is changed. In addition, there is a process of correcting the first development view so that the bending pieces do not overlap each other based on the first development view in which the bending pieces corresponding to the bending shape pattern are connected to each side of the reference shape. Since there,
It is possible to create the development drawing only by a simple operation of combining the reference shape and the bent shape pattern and inputting the dimensions of each part of the bent shape pattern. Furthermore, the elongation dimension of the bent part is determined by the material and thickness of the sheet metal,
Since the dimensions of each part given to the reference shape and the dimensions of each part given to the bending shape pattern are corrected by the elongation dimension, if the finishing dimension is entered, the dimension of each part considering the elongation dimension is automatically obtained. Therefore, the optimum size is set in order to obtain a product having a desired size.

The method according to claims 2 to 4 is a preferred embodiment when the reference shape is three-dimensional.

[0009]

【Example】

(Embodiment 1) In the present invention, description will be given mainly on the assumption of a bending process of a standardized product such as a building outer wall panel. The apparatus used in the present invention is, as shown in FIG. 2, an input means 1 equipped with a keyboard and a pointing device.
And a bending shape pattern storage unit 2 that stores a plurality of types of bending shape patterns, and a first development drawing creating unit that creates a first development drawing by combining the drawn reference shape and the selected bending shape pattern. 3, a second development view creating means 4 for creating a second development view in which the first development view is corrected so that overlapping parts are not formed in the bent pieces, and a second development view based on the input from the input means 1. Calculating means 5 for obtaining the dimensions of each part of
And a display device for outputting a development view as a calculation result, a printer, an output means 6 such as a magnetic storage means. The bending shape pattern storage unit 2, the first development drawing creating unit 3, the second development drawing creating unit 4, and the dimension calculating unit 5 are configured by a computer device.

The procedure for creating a developed view in the present invention is as shown in FIG. First, a reference shape, which is the shape of the main surface (generally, the bottom surface) of the product, is drawn by a certain scale dimension with respect to the finish dimension (step S1). That is,
Drawing is performed using a pointing device or the like so that a desired reference shape is displayed on the screen of the display device. Next, a desired bending shape pattern is selected from a plurality of types of bending shape patterns registered in the bending shape pattern storage means 2 as the cross-sectional shape of the portion to be bent (step S2). The bend shape pattern data is provided with slots for filling the dimensions of required portions. In order to select the bending shape pattern, an icon or the like is displayed on the display device so that the outline shapes of the registered bending shape patterns can be listed (see FIG. 3), and the desired bending shape is displayed by the pointing device which is the input means 1. Specify a pattern or code A '~
Each bending shape pattern may be designated by C '. If there are many registered bending shape patterns,
The time required for selecting a bending shape pattern may be shortened by grouping similar bending shape patterns using GT (Group Technology). The bending shape pattern is selected for each side of the reference shape. However, if the bending shapes are the same for all sides, the bending shape is given to one side, and the others are the same. Good.

When a bending shape pattern is selected, the display device prompts the user to enter the dimensions of a predetermined portion.
At this stage, the keyboard of the input means 1 is used to input the dimensions of each part according to the finished dimensions of the product (step S
3). Further, the material and the thickness of the sheet metal to be processed are input from the input means 1 (step S4). In this way, when the reference shape is drawn, the bending shape pattern is selected, and the material and the thickness of the sheet metal are input, the first development drawing creating means 3
In, a first development view is created (step S5). The first development view shows, as shown in FIG. 4, a bending piece 11 necessary for forming a cross-sectional shape designated by a bending shape pattern.
Are joined to each side of the main plate 10 forming one main surface of the product designated by the reference shape pattern.

In the first developed view, the bent piece 11 is the main plate 1.
It is projected over the entire length of each side of 0. Therefore, the first
In the developed view, when the internal angles of the vertices of the main plate 10 exceed 180 degrees, the bent pieces 11 overlap each other. Therefore, as shown in FIG. 5, the width of the bent piece 11 is adjusted so that such an overlapping portion is not formed. That is, the width of the bent piece 11 is reduced by the dimension δL from the vertex where the bent piece 11 overlaps. The dimension δL is determined by the protrusion dimension F of the bent piece 11, the internal angle φ of the apex of the main plate 10, and the value α corresponding to the plate thickness of the sheet metal. That is, δL = L ₁ −L ₂ = F · tan {180 ° − (φ /
2)} + α. Further, the inner angle of the apex of the main plate 10 is 18
When it is within 0 degrees, the bent piece 11 is shown on the first development view.
Do not overlap, but considering the thickness of the sheet metal as shown in Fig. 6,
The width of the bent piece 11 is reduced from the apex by the above value α. That is, δL = α.

By the way, in the first development view, the bent piece 11
Even if the bent pieces 11 do not overlap with each other, when the bending pieces 11 are bent, overlapping parts may occur between the bent pieces 11. For example, when the first development view has a shape as shown in FIG. 7 and each bending piece 11 is bent at two places, as shown in FIG. If both of the bent portions are mountain folds or valley folds, the bent pieces 11 will overlap after bending. Therefore, FIG.
As shown in (a), the bent piece 11 is provided with a notch 12 so as to prevent the bent pieces 11 from overlapping. The width d of the cutout 12 is d = by the function g whose function value is determined by the protrusion size a of the tip piece 11a forming the inner flange of the product in the bent piece 11 and the inner angle φ of the apex of the main plate 10. g
It is determined in the form of (φ, a). On the other hand, as shown in FIG. 9, when one of the two bent portions of the bent piece 11 is a mountain fold and the other is a valley fold, the notch is not formed.

As described above, the second development view in which the bent pieces 11 are not overlapped can be obtained based on the first development view (step S6). When the bending process is performed according to the second development view obtained in this way, an error occurs in the finished dimension due to elongation at the bent portion. Therefore, the elongation dimension δ when each bent portion is bent by the dimension calculation means 6 by the constant ρ defined by the material, the plate thickness t, and the bending angle θ (see FIG. 8B).
Is required (step S7). In the dimension calculation means 2,
The dimension based on the finish dimension given to the second development view is corrected by the obtained elongation dimension δ (step S
8). That is, if the finishing dimensions are set as shown in FIG. 10A, the dimensions H ₁ , H ₂ , W ₁ and W ₂ are
As shown in FIG. 10B, the dimensions H ₁ −δ and H ₂ −
It is corrected to δ, W ₁ −δ, W ₂ −δ. After the dimensions have been corrected in this way, it is output to the output means 4 as a developed view (step S9). Here, steps S1 and S
2, S3 may be after step S4.

(Embodiment 2) In Embodiment 1, the reference shape is 2
Although expressed in terms of dimensions, this embodiment is an extension of the reference shape into three dimensions. That is, assume a product as shown in FIG. If it ’s a relatively simple product,
A development view can be created by creating a three-dimensional view as shown in FIG. 20B and adding hidden lines. Therefore, the reference shape is drawn by adding a hidden line to the three-dimensional drawing. In addition, a bending shape pattern is selected and given to a representative side of the reference shape, and the material and the thickness of the sheet metal are input as in the first embodiment.

At this stage, the reference shape can be developed to obtain a figure as shown in FIG. 11. Furthermore, if the selected bending shape pattern is applied, a first developed view as shown in FIG. 12 is created. be able to. Since the processing after creating the first developed view is the same as that of the first embodiment, the description thereof is omitted. (Embodiment 3) In Embodiment 2, the reference shape is relatively simple.
Although it has been assumed that the shape is a three-dimensional shape, it is difficult to represent it in a three-dimensional diagram with a complicated three-dimensional shape. Therefore, in this embodiment, the reference shape is drawn by a method conforming to the stereoscopic drawing method. That is, the shape of each of the surfaces of the reference shape viewed from the orthogonal direction is illustrated, and the connection relationship between the surfaces is indicated. As the connection relation, it is necessary to specify the side that is the ridgeline of the faces to be joined and the face angle between the faces to be joined. After drawing the reference shape in this way, a bending shape pattern is selected and given to a representative side of the reference shape, as in the second embodiment. Also, enter the material and thickness of the sheet metal.

At this stage, it is possible to develop the reference shape and form a first developed view in which bent pieces corresponding to the bent shape pattern are joined. The processing after the first developed view is obtained is the same as that in the first embodiment, and thus the description thereof is omitted. (Embodiment 4) In each of the above embodiments, the product in which planes are joined together has been described, but in this embodiment, a method for creating a developed view for a product including a curved surface will be described. In this case, the method of the second or third embodiment can be applied to the drawing of the reference shape. Further, the point that the bending shape pattern is selected and the material and the plate thickness are input is also the same as in the second and third embodiments.

Next, the process for creating the first development view is shown in FIG.
The procedure is as shown in. That is, first, it is determined whether or not a curved surface is included (step S10), and when the curved surface is not included, a first developed view is created in the same manner as in the second embodiment (step S11). On the other hand, when the curved piece is included, it is determined whether or not the bent piece 11 is continuous to the side edge of the main plate 10 (step S12), and the bent piece 11 is formed as shown in FIG.
If is a curved surface that is not continuous, the curved surface is extended and developed into a flat surface as shown in FIG. 14B (step S13). Further, when the bent piece 11 exists on the side edge of the main plate 10 as shown in FIG. 15, the protruding dimension h of the bent piece 11 as shown in FIG.
Then, based on the bending amount r, it is determined whether or not the bending drawing is possible (step S14). If the bending drawing is possible, the bending piece 11 is bent together with the main plate 10 as shown in FIG. 17 is expanded so as to be integrally processed (step S15), and if bending drawing is impossible, the main plate 10 and the bent piece 11 are expanded as separate parts so as to be welded as shown in FIG. 17 (b) ( Step S16). Since the processing after the first development view is created in this way is the same as that in the first embodiment, the description thereof is omitted.

[0019]

As described above, according to the present invention, the shape of the main part of the product is drawn as the reference shape, and a desired bending can be performed from a plurality of types of bending shape patterns which are the sectional shapes of the portion to be bent. A shape pattern is selected, dimensions are given according to the finished dimension, and a developed view of the product is obtained by combining the reference shape and the selected bending shape pattern. Therefore, if the reference shape is drawn and the bending shape pattern is selected, products of various shapes can be obtained. This has the effect of being able to easily create a development view of. Further, since the dimension is given to the bent shape pattern, there is an advantage that it is possible to easily deal with the case where the thickness dimension of the product is changed. In addition, there is a process of correcting the first development view so that the bending pieces do not overlap each other based on the first development view in which the bending pieces corresponding to the bending shape pattern are connected to each side of the reference shape. Therefore, it is possible to create the development drawing only by the simple work of combining the reference shape and the bent shape pattern and inputting the dimensions of each part of the bent shape pattern. Furthermore, the stretched dimension of the bent portion is determined by the material and thickness of the sheet metal, and the dimension of each portion given to the standard shape and the dimension of each portion given to the bending shape pattern are corrected by the stretched dimension. By inputting, the size of each part in consideration of the elongation size is automatically obtained, and the optimum size is set in order to obtain the product of the desired size.

[Brief description of drawings]

FIG. 1 is an operation explanatory diagram illustrating a processing procedure of a first embodiment.

FIG. 2 is a block diagram of a first embodiment.

FIG. 3 is a diagram showing a display example of a bending shape pattern used in the embodiment.

FIG. 4 is a diagram showing an example of a first development view in the embodiment.

FIG. 5 is a diagram showing an example of avoiding overlapping of bent pieces in the embodiment.

FIG. 6 is a diagram showing an example of a portion where bent pieces do not overlap in the embodiment.

FIG. 7 is a diagram showing an example before considering an overlapping portion after bending in an example.

FIG. 8A is a diagram showing an example of a second development view in which an overlapping portion is not formed after bending, and FIG. 8B is a cross-sectional view of a main part showing an example of a shape after bending.

FIG. 9 is a cross-sectional view of essential parts showing an example of a shape after bending.

10A is a diagram showing a state in which finishing dimensions are set in the example, and FIG. 10B is a diagram showing a state in which elongation dimensions are corrected in the example.

FIG. 11 is a developed view of the reference shape of the second embodiment.

FIG. 12 is a diagram showing a first developed view of the second embodiment.

FIG. 13 is an operation explanatory diagram of the main parts of the fourth embodiment.

FIG. 14A is a diagram showing a reference shape having a curved surface;
(B) is a figure of the state where the standard shape was developed.

FIG. 15 is a diagram showing a reference shape having a bent piece in Example 4;

FIG. 16 is a diagram illustrating a determination condition for bending drawing in Example 4.

17A and 17B are diagrams showing a developed example of a reference shape having a bent piece in Example 4, where FIG. 17A is a case of being integrated, and FIG.

FIG. 18 is a diagram showing an example of a dimension setting method of a conventional example.

FIG. 19 is a diagram showing an example of a conventional development view.

FIG. 20A is a diagram showing an example of a developed view that cannot be dealt with by the conventional example, and FIG. 20B is a diagram showing an example of a product that cannot be dealt with by the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input means 2 Bending shape pattern storage means 3 1st development view creation means 4 2nd development view creation means 5 Dimension calculation means 6 Output means

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[Procedure amendment]

[Submission date] February 3, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

In the first developed view, the bent piece 11 is the main plate 1.
It is projected over the entire length of each side of 0. Therefore, the first
In the developed view, when the internal angles of the vertices of the main plate 10 exceed 180 degrees, the bent pieces 11 overlap each other. Therefore, as shown in FIG. 5, the width of the bent piece 11 is adjusted so that such an overlapping portion is not formed. That is, the width of the bent piece 11 is reduced by the dimension δL from the vertex where the bent piece 11 overlaps. The dimension δL is determined by the protrusion dimension F of the bent piece 11, the internal angle φ of the apex of the main plate 10, and the value α corresponding to the plate thickness of the sheet metal. That is, δL = L ₁ −L ₂ = F / tan {180 ° − (φ /
2)} + α. Further, the inner angle of the apex of the main plate 10 is 18
When it is within 0 degrees, the bent piece 11 is shown on the first development view.
Do not overlap, but considering the thickness of the sheet metal as shown in Fig. 6,
The width of the bent piece 11 is reduced from the apex by the above value α. That is, δL = α.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Front page continuation (72) Inventor Shinichi Goya 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (4)

[Claims] 1. A process of drawing a shape of a main part of a product as a reference shape with a constant scale dimension with respect to a finish dimension, and a plurality of types of bending shape patterns registered in advance as a sectional shape of a portion to be bent. From the process of selecting the desired bending shape pattern from the above, the process of giving the dimensions of each part to the bending shape pattern by finishing dimensions, the process of inputting the material and thickness of the sheet metal to be bent, and the corresponding bending shape pattern The process of connecting the bent pieces to each side of the reference shape to create the first development view, and the first development view and the first development view so that overlapping parts are not formed between the bent pieces after the bending process. The process of creating the modified second development view, the process of obtaining the extension dimension of the bent portion based on the sheet metal material and the plate thickness, and the dimension given to the second development view based on the obtained extension dimension correction And a process for obtaining a desired development drawing, and a method for automatically creating a development drawing for bending. 2. The method for automatically creating a development drawing for bending according to claim 1, wherein the reference shape is drawn by a three-dimensional drawing. 3. The method for automatically creating a development drawing for bending according to claim 1, wherein the reference shape is drawn according to an orthographic drawing method. 4. A process of determining whether or not a curved surface is included in the reference shape, and integrally forming the bending piece according to the bending amount when the bending piece includes the curved surface and is bent along the curved surface. 4. A method for automatically creating an expansion drawing for bending according to claim 2 or claim 3, further comprising a step of determining whether to expand or separate.