JPH08190580A - Development generation method for sheet metal parts - Google Patents

Abstract

PURPOSE: To generate a development of sheet metal parts many kinds and small amounts of which are produced by deforming a small worked shape of a specific hole, a notch, or the like into such size by CAD data and a deformation parameter that its shape can be discriminated at a glance by a worker. CONSTITUTION: When small round notes 52 and 52 near the edges of sheet metal parts 51 are taken as the deformation object, the external shape of parts 51 before deformation is shown in (a). Enlargement of the part of the round hole 52 is shown in (b), and a circumscribed rectangle of the round hole 52 is indicated by broken lines, and center coordinates of this rectangle 53, namely, center coordinates of the round hole 52 are indicated by X. It is deformed in the -Y direction. Deformation of the round hole with a maximum magnification is shown in (c), and the occurrence of interference with an edge part 54 is indicated by oblique lines. Deformation of the round hole 52 with a minimum magnification is shown in (d) and deformation is terminated when the interference doesn't occur. The whole of results after deformation of the other round hole in the same manner is displayed as shown in (e).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for creating a developed view of a sheet metal part, and more particularly, to create a developed view for use in part sorting work such as punching and cutting after sheet metal working and bending of parts. On how to do.

[0002]

2. Description of the Related Art When assembling sheet metal parts that have been cut and punched from blanks, development views are referred to as necessary. Conventionally, the development drawing of a sheet metal part is usually created by handwriting. Sheet metal parts have small notches, holes, etc., and parts having large shapes can easily distinguish between the parts, but it is difficult to distinguish when the shape of the notches or the like is small as a whole. Therefore, in the handwritten sheet metal part development drawing, the developed shape of the part is
To make it easier for workers who actually perform sorting, etc.
Small cutouts and holes are exaggerated and drawn to make it different from the actual size.

Further, in the case of a handwritten development view, in the case of parts having similar shapes in which only some of the shapes are different, for example, if the only difference is the dimension in the longitudinal direction, a figure in which no dimension is entered is drawn. As the base paper, the size is entered on the copied material and used as a development drawing.

As described above, according to the development drawing created by handwriting, there is an advantage that the operator can immediately judge the characteristics of the parts in the work of sorting the parts, but on the other hand, the development drawing of each unit is divided into units. Since it has to be hand-written one by one, it takes time, and when it is necessary to handle a large number of parts, it is very inefficient.

Therefore, a method of automatically generating a developed view of a sheet metal part by utilizing CAD data or the like has been considered. When a development drawing is automatically generated from this CAD data, the development drawing is drawn at a constant magnification from the data representing the development shape of each component.

[0006]

[Problems to be Solved by the Invention] However, CAD
In the case of automatically creating a development drawing using data, since it is expressed by a uniform expansion ratio over the entire part, small cutouts or holes can be made in sheet metal parts with a relatively large outer shape and fine small processing. It has the drawback that it is crushed and shown in the drawing. Especially in the case of drilling holes with small dimensions, there is the inconvenience that it is impossible to determine whether the hole is a round hole or a square hole. Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and to represent the shape of a small notch or punched hole which cannot be discriminated from the actual size by automatically deforming it to be large. It is an object of the present invention to provide a method for creating a developed view of a sheet metal part that enables automatic creation of a developed view of the sheet metal part from CAD data.

[0007]

In order to achieve the above object, the present invention provides CAD data representing a developed shape of a sheet metal part and an object to be deformed for deforming a small machining shape which is crushed and not visible at an actual size. A dimension serving as a reference for element extraction and a deformation parameter in which a deformation magnification is set are prepared in advance, a shape element is closed-looped from the CAD data, and a deformation target element is extracted according to the deformation parameter. It is characterized in that the deformation of the target element is executed and a developed view of the sheet metal part is created.

Further, in order to achieve the above-mentioned object, the present invention is a CA representing a developed shape of a sheet metal part including dimension elements.
D data, a dimension that serves as a reference for extracting a transformation target element for transforming a small machining shape that is crushed at an actual size and is not visible, and a transformation parameter that sets a transformation magnification are prepared in advance, and the dimension element is calculated from the CAD data. Is extracted and saved, the shape element is closed-looped from the CAD data, the deformation target element is extracted according to the deformation parameter, the target element is deformed in closed loop units, and then the CAD data after the deformation is saved first. It is characterized in that a developed view of a sheet metal part with dimensions before deformation is created by synthesizing the dimension elements that have been formed.

[0009]

According to the present invention, small machining shapes such as holes and cutouts that cannot be seen by being crushed at the actual size are deformed from the CAD data representing the developed shape of the sheet metal part and the deformation parameters that deform the small machining shape. Then, the development view of the sheet metal part is automatically generated in such a size that the operator can see the shape at a glance.

Further, when the CAD data includes hole and notch dimension data, the CAD data is taken out and stored before the deformation and is combined after the deformation, so that a developed view with dimensions displayed is automatically generated. To be done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method of creating a developed view of a sheet metal part according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a flow chart showing an algorithm of the development drawing creation processing of the present embodiment, and FIG. 2 is a deformation parameter used for stretching and deforming a machining shape such as a small notch or a hole that is crushed and not visible at an actual size. 2 is a configuration example of the data of FIG.

The first step 11 is a process for creating a closed loop group for each shape element. C input
From the AD data, the data representing a certain graphic element is a straight line,
If it is data that represents an arc, then while detecting the same straight line and arc elements that follow it, the next element that matches the end point of the first element, the next element that matches the end point of that element, and so on, are connected in sequence. , Make a closed loop into a graphic element that connects the base point of the first element and the end point.

Since the circle is determined by the coordinates of the position and its radius, the CAD data representing the circle is treated as a closed loop each time an element is detected. This process is repeated until all CAD data is completed, and straight lines, arcs,
Create multiple closed loop groups for each shape, such as a circle.

Next, step 12 is a process of extracting the deformation target element in each group of the closed loop which has been divided into groups. When the graphic element falls within the deformation element size range of the deformation parameters shown in FIG. 2, it is taken out and set as the deformation target element. In this case, the deformation parameter data is created in advance, and the dimension range of the element to be deformed is divided into several steps with the minimum and maximum units, and the minimum and maximum magnifications are set at each step. I'll do it. The dimension of the deformable element means, for example, the distance between the end points if it is a straight line, and the radius if it is a circular arc or circle. In the example of FIG. 2, a straight line in which the distance between the end points of the straight line is in the range of 1 mm to 10 mm is extracted as the deformation target element, and the deformation magnification is expanded to 5 to 10 times.

Step 13 is a process when there is no element to be deformed in a closed loop group, and the next closed group is processed.

The following step 14 is a process for executing the deformation of the deformation target element extracted in step 12 according to the deformation magnification in the closed loop group from which the deformation target element is extracted. Details of this processing procedure will be described later.

When the transformation is completed for all the closed groups, the transformed figure can be output to the printer to obtain a developed view of the sheet metal part (steps 15 and 16).

Next, the details of the deformation process will be described with reference to the flowchart of FIG. 3 and the process of each step of FIG. 3 in which FIG. 4 concretely exemplifies a small cutout in the outer shape as a deformation element.

The first step 31 is a process of calculating a rectangular area circumscribed by the closed loop of the deformation target element. This rectangular area is assumed to be areas in which the maximum XY coordinates and minimum XY coordinates of CAD data are the upper right and lower left coordinates of the rectangle, respectively.

Next, in step 32, the center coordinates of the rectangle obtained in step 31 are calculated, and this coordinate is set as the deformation reference position.

For example, reference numeral 41 in FIG.
Shows the original shape of the sheet metal part 41. This sheet metal part 41
Then, the notch 41a represented by the bold line is the deformation target element. For deforming the notch 41a, refer to the notch 4
The elements in the x direction and the y direction that define 1a will be considered separately. In FIG. 4B, a rectangle circumscribing the outer shape of the notch 41a that is the element to be deformed is indicated by a broken line, and the center position 43 of the circumscribing rectangle 42 is x. This center position 43 is set as the deformation reference position.

Step 33 is a process for determining in which direction the deformation target element is to be deformed. In this case, the two end points of the element to be deformed are determined in which position in four directions [+ Y side, −Y side, + X side, −X side] with reference to the center coordinates, and the X axis is determined from that position. Elements parallel to the + direction,
It is determined that an element parallel to the or-direction, and also parallel to the Y-axis, deforms in either the + Y or -Y direction.

An element that is neither parallel to the X axis nor the Y axis is determined to be deformed in two directions.

Next, in step 34, when there are a plurality of elements to be deformed, the deforming element is deformed, so that other elements that are affected are deformed at the same time. Therefore, a region for extracting the element to be deformed is determined. It is a process to do. Here, in addition to the elements belonging to this closed loop, other closed loop group elements are targeted as the elements to be deformed at the same time. For example,
The deformation element is parallel to the X-axis and the end points are x1 = 10, x2 = 20
Then, all the elements having the X coordinate in the range of 10 to 20 are the targets of deformation.

In FIG. 4C, the area 45 including the other deformation target element affected by the notch 41a in the deformation target element in the x direction is indicated by hatching. This area 45 also includes a round hole 44 near the edge of the sheet metal part 41.
The deformation direction of this area 45 is + of the center coordinate 43.
Since it corresponds to the X direction, all of the elements 41a, 44, and 44 in the shaded area 45 are uniformly deformed in the + X direction.

Step 35 is a process for executing the deformation based on the deformation direction and the deformation area calculated so far. Here, the transformation is performed in the following order.

First, the deformation is performed at the maximum magnification of the deformation parameter. In the case where one element interferes with another element due to the deformation (Yes in step 36), the element is over-deformed, and therefore the element is deformed at the minimum magnification of the deformation parameter (step 37). If the interference still occurs (Yes in step 38), the optimum reference position and the deformation magnification are calculated from the distance between the coordinates that interfered when the deformation is performed at the maximum magnification and the deformation reference coordinates of the deformation target element, and the deformation is performed. To do. If the deformation is not possible even at the minimum magnification, the deformation is stopped.

Reference numeral 46 shown in FIG. 4 (d) is a figure after the transformation is executed at the maximum magnification. In this case, the reference position of the round hole 44 has also moved. Similarly, the end point of the deformable element is y in the Y direction.
The other element to be deformed for 1 and y2 is to deform the shaded area 47 in FIG. 4 (e) at the maximum magnification in the + Y direction. The result of deformation is 48 in FIG. 4 (f). It looks like the shape shown.

Next, FIG. 5 shows a specific example of the sheet metal part 51 when the small round holes 52, 52 near the edges are to be deformed. FIG. 5A shows a sheet metal part 5 before deformation.
It is a figure which shows the outer shape of 1. FIG. 5B is an enlarged view of the portion of the round hole 52. Reference numeral 53 indicates a rectangle circumscribing the round hole 52 by a broken line, and the center coordinates of the rectangle 53, that is, the center coordinates of the round hole 52 are indicated by x. Show. The deformation direction will be described as the −Y side.

In FIG. 5C, the round hole 52 is deformed at the maximum magnification, but the interference occurs at the end edge portion 54 by hatching. On the other hand, FIG. 5 (d)
Shows an example in which the round hole 52 is deformed at the minimum magnification. As shown in this figure, the deformation ends when no interference occurs. Similarly, FIG. 5E shows the entire result after the deformation of another round hole.

Next, FIG. 6 describes the development of the development drawing when the CAD data of the sheet metal part includes dimension elements. FIG. 6A shows a development view of the sheet metal part 61 before deformation, and FIG. 6B shows a development view after deformation. In this case, if the sheet metal part 61 has deformation elements such as a notch 62 and a round hole 63, and the CAD data includes data of these dimensions, only the dimension elements are extracted and stored before the deformation, and the deformation is executed. Figure (b) by combining later
An exploded view with dimensional elements can be obtained, as shown in. Here, since the reference coordinates may be deformed when the deformation is executed, if there is a correspondence between the dimension element and the actual developed figure of the sheet metal part 61, the parts are sorted in the expanded view after the modification. Is enough for

[0032]

As described above, according to the present invention, the CAD data representing the developed shape of the sheet metal part is deformed such as a small hole or a cutout which is crushed and cannot be discriminated when output on paper. Since the development drawing is of a size that can be discriminated by the operator and can be automatically and efficiently created, it is particularly effective when creating the development drawing for sheet metal parts of high-mix low-volume production.

Even when the CAD data includes a dimension element, if the dimension element is extracted before the transformation of the transformation target element, the CAD data is saved, and the CAD data is combined after the transformation, the actual dimension before the transformation is obtained. It is possible to create a development drawing that can display the dimensions in.

[Brief description of drawings]

FIG. 1 is a flowchart showing a flow of processing for creating a developed sheet metal part diagram of the present invention.

FIG. 2 is an explanatory diagram showing an example of a data structure of deformation parameters.

FIG. 3 is a flowchart showing a flow of processing for deforming a target element based on a deformation parameter.

FIG. 4 is an explanatory diagram showing an actual modification example of a component having a notch with a small outer diameter.

FIG. 5 is an explanatory diagram showing an example of actual modification of a component having a small round hole near the edge.

FIG. 6 is an explanatory diagram showing an example of a developed view generated from CAD data with dimension elements.

[Explanation of symbols]

 41 sheet metal part 41a notch (deformation target element) 42 rectangle circumscribing the deformation element 43 center position of deformation reference 51 sheet metal part 52 round hole (deformation target element) 53 rectangle circumscribing the deformation element 54 interference area

Claims (2)

[Claims] 1. CAD data representing a developed shape of a sheet metal part, a reference dimension for extracting a deformation target element for deforming a small machining shape that is crushed at an actual size and cannot be seen, and a deformation parameter in which a deformation magnification is set. Prepared in advance, the shape element is closed-looped from the CAD data, the deformation target element is extracted according to the deformation parameter, and then the target element is deformed in closed loop units to create a developed view of the sheet metal part. A method for creating a developed view of a sheet metal part, which is characterized in that 2. CAD data representing a developed shape of a sheet metal part including dimension elements, a reference dimension for extracting an element to be deformed for deforming a small machining shape that is crushed at the actual size and cannot be seen, and a deformation magnification. The set deformation parameter is prepared in advance, the dimension element is extracted from the CAD data and stored, the shape element is closed-looped from the CAD data, and the deformation target element is extracted according to the deformation parameter. After the deformation of the target element is executed, the CAD data after the deformation and the dimension element previously stored are combined to create an exploded view of the sheet metal part with dimensions before deformation. How to make.