JP2972003B2 - Automatic creation of development drawings for bending - Google Patents

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 preparing a developed view for bending, in which dimensions of each portion of the developed view required for bending are accurately set based on a finished dimension.

[0002]

2. Description of the Related Art Generally, when a product is obtained by bending, a developed view is required. On the other hand, with the automation of processing, attempts have been made to automatically create this type of developed view by CAD. For example, JP-A-63-130220
Been the invention described in JP-to form a box-like product, as in FIG. 12, the size of the cross-sectional shape and each part of the outline of the vertical and horizontal directions of the sheet metal _{H 1 ~H 3, W 1 ~W} 3
By inputting the material and thickness of the sheet metal as necessary, the development view D is automatically adjusted to the dimension corrected for the sheet thickness of the sheet metal and the elongation of the bent portion as shown in FIG. Is to be created. Regarding the overlap at the butting portion, a desired shape is selected from a plurality of types of butting patterns registered in advance, and the cutout shape of the corner portion is determined according to the shape of the butting portion. .

[0003]

However, in the above-described conventional configuration, the dimensions and bending shape of each part are input only in the vertical and horizontal directions of the sheet metal. Therefore, only a development view of a box-shaped product formed in a rectangular parallelepiped shape can be obtained. There is a problem that it cannot be formed. That is, as shown in FIG. 14A, a development view D for a product whose bottom is not square or rectangular.
Further, there is a problem that the conventional method cannot cope with a product P which is not box-shaped as shown in FIG.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems. By selecting a reference shape pattern and a bending shape pattern registered in advance, even a product other than a rectangular parallelepiped can easily be developed. It is an object of the present invention to provide a method for automatically creating a development view for bending work, which can be created in advance.

[0005]

According to the present invention, in order to achieve the above object, a process of selecting a desired reference shape pattern from a plurality of types of reference shape patterns registered in advance as the shape of a main surface of a product. And a process of selecting a desired bending shape pattern from a plurality of types of bending shape patterns registered in advance as a cross-sectional shape of a portion to be bent, and a process of selecting each bending portion from the selected reference shape pattern and bending shape pattern. The process of giving the dimensions by the finishing dimensions, the process of inputting the material and thickness of the sheet metal to be bent, and connecting the bent pieces corresponding to the bent shape pattern to each side of the reference shape pattern to obtain a first developed view. In the process of creating, the first development view and the second development view in which the first development view is modified so that overlapping portions are not formed between the bent pieces after bending are formed. And estimating the amount of elongation of the bent portion based on the material and thickness of the sheet metal, and correcting the dimensions given to the second developed image based on the obtained elongation to achieve the desired developed image And the process of obtaining

[0006]

According to the above arrangement, a plurality of types of main surface shapes of a product are registered in advance as reference shape patterns.
Further, a plurality of types of cross-sectional shapes of a portion to be bent are registered in advance as a bent shape pattern, and a developed view of a product is obtained by selecting and combining a desired reference shape pattern and a bent shape pattern. I have. That is, it is possible to easily create a development view for products of various shapes only by selecting the reference shape pattern and the bending shape pattern. In addition, since dimensions are given to the reference shape pattern and the bending shape pattern, if the types of the reference shape pattern and the bending shape pattern are in the same category, even if the dimensions of the respective parts are different, it can be easily dealt with. By registering a small number of reference shape patterns and bending shape patterns, it becomes possible to handle a wide variety of products. The method further includes a step of correcting the first development view so that the bending pieces do not overlap each other based on the first development view in a state where the bent pieces corresponding to the bent shape pattern are connected to each side of the reference shape pattern. Therefore, it is possible to create a development view only by a simple operation of combining the reference shape pattern and the bending shape pattern and inputting the dimensions of each part. Also, the amount of elongation of the bent part is determined by the material and thickness of the sheet metal, and the dimensions of each part given by the finishing dimensions with respect to the reference shape pattern and the bending shape pattern are corrected by the amount of elongation, so input the finishing dimension. Then, the dimensions of each part in consideration of the amount of elongation are automatically determined, and the optimal dimensions are set to obtain a product having a desired dimension.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, description will be made mainly on the assumption of bending a fixed product such as a building exterior wall panel. The apparatus used in the present invention is, as shown in FIG. 2, an input means 1 having a keyboard and a pointing device.
And a reference shape pattern storage means 2 storing a plurality of types of reference shape patterns, a bending shape pattern storage means 3 storing a plurality of types of bending shape patterns, a selected reference shape pattern and a selected bending shape pattern. And a second developed view for creating a second developed view in which the first developed view is modified so that no overlapping portion is formed in the bent piece. Means 5, dimensional calculation means 6 for obtaining the dimensions of each part of the second developed view based on the input from input means 1, and output means such as a display device, printer, magnetic storage means for outputting a developed view as a calculation result 7 is provided. The reference pattern storage means 2, the bending shape pattern storage means 3, the first development view creation means 4, the second development view creation means 5, and the dimension calculation means 6 are constituted by a computer device.

The procedure for creating a development view in the present invention is as shown in FIG. First, a desired reference shape pattern is selected from a plurality of types of reference shape patterns registered in the reference shape pattern storage means 2 in accordance with the shape of one main surface (generally, the bottom surface) of the product (step S1). Here, the reference shape pattern is defined as the shape of one main surface of the product, and the data of the reference shape pattern is provided with slots for filling the dimensions of required portions. To select a reference shape pattern, for example,
The outline shape of the registered reference shape pattern is displayed on the display device as the output means 7 by an icon or the like so as to be listed (see FIG. 3), and the desired reference shape pattern is designated by the pointing device as the input means 1. What should I do? Further, each reference shape pattern may be designated by codes A to F. If there are many registered reference shape patterns, GT
If a group is formed for each similar reference shape pattern by (group technology), the time required to select the reference shape pattern is reduced.

[0009] When the reference shape pattern is selected, a display is displayed on the display device so as to input dimensions of a predetermined portion.
At this stage, the dimensions of each part are sequentially input using the keyboard as the input means 1 (step S2). Here, the finished dimensions of the product are applied to each part. Next, as the cross-sectional shape of the part to be bent, the bending shape pattern storage means 3 is used.
A desired bending shape pattern is selected from among a plurality of types of bending shape patterns registered in (1) (step S3).
Slots are also provided for filling the dimensions of required locations in the data of the bending shape pattern. In order to select a bending shape pattern, an icon or the like is displayed on the display device so as to list the outline shapes of the registered bending shape patterns in the same manner as the reference shape turn (FIG. 4).
), A desired bending shape pattern is designated by a pointing device as the input means 1, and a code A '
Each of the bending shape patterns may be designated by .about.C '.
When there are a large number of registered bending shape patterns, the time required for selecting a bending shape pattern may be reduced using GT.

When the bending shape pattern is selected, the dimensions of the predetermined portion are displayed on the display device so as to be inputted. At this stage, the dimensions of each portion are inputted by using the keyboard as the input means 1 according to the finished dimensions of the product. (Step S4). Further, the material and thickness of the sheet metal to be processed are input from the input means 1 (step S5). When the reference shape pattern and the bent shape pattern are selected and the material and thickness of the sheet metal are input, the first developed view is created by the first developed view creating means 4 (step S).
6). In the first development view, as shown in FIG. 5, a bent piece 11 required to form a cross-sectional shape specified by a bent shape pattern forms a main surface of a product specified by a reference shape pattern. It is connected to each side of the main plate 10.

In the first developed view, the bent piece 11 is the main plate 1
0 is protruded over the entire length of each side. Therefore, the first
In the developed view, when the inner angle of each vertex of the main plate 10 exceeds 180 degrees, the bent pieces 11 overlap each other. Therefore, as shown in FIG. 6, 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 inner angle φ of the vertex of the main plate 10, and the value α corresponding to the thickness of the sheet metal. That is, δL = L ₁ −L ₂ = F / tan ｛180 ° − (φ /
2) It becomes｝ + α. Also, the inner angle of the vertex of the main plate 10 is 18
If the angle is within 0 degree, the bent piece 11 is displayed on the first development view.
Do not overlap, but taking into account the thickness of the sheet metal as shown in FIG.
The width of the bent piece 11 is reduced from the vertex by the value α. That is, δL = α.

By the way, in the first developed view, the bent piece 11
Even when the bent pieces 11 are not overlapped with each other, when the bending process is performed on each bent piece 11, an overlapping portion may be generated between the bent pieces 11. For example, when the first developed view is shaped as shown in FIG. 8 and each bent piece 11 is bent at two places, as shown in FIG. If both of the bent portions are mountain-folded or valley-folded, the bent pieces 11 will overlap after bending. Therefore, FIG.
As shown in (a), the notch 12 is provided in the bent piece 11 so as to prevent the bent piece 11 from overlapping. The width d of the notch 12 is determined by a function g whose function value is determined by the protrusion dimension a of the tip piece 11 a forming the inner flange of the product in the bent piece 11 and the inner angle φ of the vertex of the main plate 10. g
It is determined in the form of (φ, a). On the other hand, as shown in FIG. 10, when one of the two bent portions of the bent piece 11 is a mountain fold and the other is a valley fold, no cutout is formed.

As described above, it is possible to obtain a second developed view in which the bent pieces 11 are prevented from overlapping based on the first developed view (step S7). When bending is performed in accordance with the second developed view obtained in this manner, an error occurs in a finished dimension due to extension at a bent portion. Therefore, the dimension calculating means 6 calculates the elongation amount δ when the bent portion is bent, based on the constant ρ defined by the material, the plate thickness t, and the bending angle θ (see FIG. 9B). (Step S8). In the dimension calculation means 2, the second
The dimension based on the finish dimension given to the developed view is corrected by the calculated elongation δ (step S9). That is, assuming that the finishing dimensions are set as shown in FIG. 11A, the dimensions H ₁ , H ₂ , W ₁ , and W ₂ are calculated as shown in FIG.
As shown in (b), dimensions H ₁ -δ, H ₂ -δ, W ₁
−δ, W ₂ −δ. After the dimensions are corrected in this way, the developed data is output to the output means 4 as a development view (step S10). Here, steps S1, S3, S
5 may be performed in any order, and steps S2 and S4 may be performed at any stage after steps S1 and S3 and before step S6.

[0014]

As described above, according to the present invention, a desired reference shape pattern is selected from a plurality of types of reference shape patterns registered as main one-side shapes of a product, and a portion to be subjected to a bending process is selected. Since a desired bending shape pattern is selected from a plurality of types of bending shape patterns registered as the cross-sectional shape of the product, and the selected reference shape pattern and bending shape pattern are combined, a development view of the product is obtained. In addition, it is possible to easily produce a development view of products of various shapes only by selecting the reference shape pattern and the bending shape pattern. Here, 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 a state where the bent pieces corresponding to the bent shape pattern are connected to each side of the reference shape pattern. Therefore, it is possible to create a development view only by a simple operation of combining the reference shape pattern and the bending shape pattern and inputting the dimensions of each part. In addition, since dimensions are given to the reference shape pattern and the bending shape pattern, if the types of the reference shape pattern and the bending shape pattern are in the same category, even if the dimensions of the respective parts are different, it can be easily dealt with. If a small number of reference shape patterns and bending shape patterns are registered, there is an advantage that it is possible to handle a wide variety of products. Furthermore, the amount of elongation of the bent portion is determined by the material and thickness of the sheet metal, and the dimensions of the respective parts given by the finishing dimensions for the reference shape pattern and the bending shape pattern are corrected by the amount of elongation. This has the advantage that the dimensions of each part taking into account the amount of elongation are automatically determined and the optimal dimensions are set to obtain a product of the desired dimensions.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of an embodiment.

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

FIG. 4 is a diagram showing a display example of a bending shape pattern used in the embodiment.

FIG. 5 is a diagram showing an example of a first development view in the embodiment.

FIG. 6 is a diagram illustrating an example of avoiding overlapping of bent pieces in the embodiment.

FIG. 7 is a diagram illustrating an example of a portion where bent pieces do not overlap in the embodiment.

FIG. 8 is a diagram showing an example before considering an overlapped portion after bending in an embodiment.

FIG. 9A is a diagram showing an example of a second developed view in which no overlapping portion is formed after bending, and FIG. 9B is a cross-sectional view of a main part showing an example of a shape after bending.

FIG. 10 is a sectional view of a main part showing an example of a shape after bending.

11A is a diagram illustrating a state in which finishing dimensions are set in the example, and FIG. 11B is a diagram illustrating a state in which the amount of elongation is corrected in the example.

FIG. 12 is a diagram showing an example of a method for setting dimensions in a conventional example.

FIG. 13 is a diagram showing an example of a conventional development view.

14A is a diagram illustrating an example of a development view that cannot be handled by the conventional example, and FIG. 14B is a diagram illustrating an example of a product that cannot be handled by the conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 input means 2 reference shape pattern storage means 3 bending shape pattern storage means 4 first development view creation means 5 second development view creation means 6 dimension calculation means 7 output means

Claims (1)

(57) [Claims] 1. A process of selecting a desired reference shape pattern from a plurality of types of reference shape patterns registered in advance as a shape of a main surface of a product, and registering a cross-sectional shape of a portion to be bent in advance. A process of selecting a desired bending shape pattern from a plurality of types of bending shape patterns, a process of giving the dimensions of each part to the selected reference shape pattern and bending shape pattern by finishing dimensions, and a material of a sheet metal to be bent. And a step of inputting a sheet thickness, a step of combining a bent piece corresponding to a bent shape pattern with each side of the reference shape pattern to create a first development view, and a step of bending after the first development view and bending processing. The process of creating a second developed view in which the first developed view is modified so that no overlapping portion is formed between the pieces, and the amount of extension of the bent portion based on the material and thickness of the sheet metal And a step of correcting a dimension given to the second developed view based on the determined amount of elongation to obtain a desired developed view. How to make.