JPH056413A - Parts diagram preparation method for cad system - Google Patents

Abstract

PURPOSE:To reduce the man-hour needed for changing an obliquely attached parts shape into a right projection method, the correcting mistakes caused by the change of the parts shape, and the man-hour needed for positioning a projected plane into an optimum drawing frame. CONSTITUTION:A CAD system includes a right projection conversion processing part 20 and a projected plane layout processing part 21. Then the CAD system secures the correspondence among the elements existing on each projected plane of a single parts having an oblique expression shape and converts a single projected plane into the rotary coordinates. meanwhile other projected planes are converted into the coordinates with shift by reference to the end points of elements on these projected planes. Thus the duplicated elements are turned into a single line with the shift coordinate conversion. As a result, a projected plane that undergone the right projected conversion is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a part drawing preparation method in a CAD system, and more particularly to a part drawing preparation method relating to orthographic plane conversion and disassembly of a part drawing by CAD for mechanical design and drawing.

[0002]

2. Description of the Related Art The process of taking out a part drawing of a single part (hereinafter referred to as disassembly) from an assembly drawing created by two-dimensional CAD to complete a part drawing has been conventionally performed according to the process shown in FIG.

First, an assembly drawing is drawn by CAD (step S1), and a specified single product is disassembled from this assembly drawing data (step S2). Next, since the same graphic drawing area as the assembly drawing is often the graphic drawing area of the disassembled single-part drawing, each projection plane is aligned (step S3), and dimensions and notes are input (step S4). ) Complete the parts drawing.

Further, in the above-mentioned process, when there is a part obliquely attached as shown in FIG. 9 in the assembly drawing,
Since the part drawing must be drawn by the orthographic projection method, the shape is edited after the disassembly (step S5), and converted into the orthographic projection method to align the projection plane to the optimum drawing drawing area (step S5).
3) was done.

[0005]

However, in the above-described conventional method for creating a drawing of parts, it is impossible to disassemble the obliquely mounted parts and directly input the dimension line or the note. For this reason, it is necessary to use edit commands such as rotation and trimming as an editing work to correct or add a shape and convert it into an orthographic view. In addition, since it may be difficult to perform such editing depending on the shape, it is often the case that all parts drawings are newly rewritten. Therefore, in the conventional part drawing creation method, a lot of man-hours are spent for editing and rewriting, and since transcription errors often occur due to transcription, it is necessary to spend unnecessary man-hours on the drawing check work for ensuring the drawing quality. .

Further, a shape correction often occurs due to a transcription error, which places a great burden on the drafting person. On the other hand, since the assembly drawing is drawn in a large drawing area such as A1 or A2 size, the projection planes of the respective parts are often separated from each other, and it is necessary to adjust the shape of each projection plane to fit the optimum drawing area. there were.

FIG. 10 is a diagram showing an example of such projection plane alignment. In the component diagram 100 immediately after disassembly, since the projection planes are separated from each other, the projection planes are moved (step S6). After creating the component drawing 101 after moving the projection plane, the drawing size is changed so as to include each of these projection surfaces (step S7), and the component drawing after the drawing size change 1
Get 02. Such projection plane alignment work also imposes a heavy burden on the drafting person.

The present invention has been made to solve the above-mentioned problems. The number of man-hours required to change the shape of an obliquely mounted component to the orthographic projection method, correction mistakes due to the change in shape, and the position of the projection plane within the optimum drawing frame. An object of the present invention is to provide a part drawing creation method in a CAD system that can reduce the number of man-hours required for matching.

[0009]

According to the present invention, the end points of elements are associated with each other between the projection planes of a single-piece component having an oblique expression shape,
Rotating coordinate transformation of one projection plane, referring to the end point of the element of the other associated projection plane, the coordinate transformation of the other projection plane is transformed, and the duplicated element is converted into a single line by this coordinate transformation. By doing so, an orthographically transformed projection plane is obtained. In addition, for each projection plane that has been orthographically converted, lay out each projection plane at the optimum position, taking into consideration the dimensions and the annotation input area, and input and arrange the optimum drawing frame that includes all the laid out projection planes. The data of all completed projection planes are output.

[0010]

According to the present invention, the procedure for converting the oblique representation parts into orthographic projection, obtaining the optimum drawing frame size from the orthographically converted shape, and laying out each projection surface shape on this drawing frame size is realized by CAD. Therefore, the work of correcting and adding the shape becomes unnecessary.

[0011]

FIG. 2 is a block diagram showing a schematic configuration of a CAD device for realizing the parts drawing creating method of the present invention.
The graphic processing device 1 includes a tablet 10 for inputting coordinate value information and a keyboard 11 for inputting numerical value information.
Connected to 3. The graphic processed by the graphic processing device 13 is displayed on the screen of the graphic display device 12. The graphic processing device 13 analyzes the input information to generate a graphic, and stores the generated graphic data in the graphic storage device 14. The projection plane conversion processing device 15 performs orthographic conversion and disassembly of a single component having an oblique expression shape from the graphic data stored in the graphic storage device 14. Assembly drawing data created as a result
The data is stored in the graphic data file 16. The graphic data file 18 is composed of two data files. The graphic data file 16 stores assembly drawing data, and the graphic data file 17 is disassembled parts drawing data.
Data is stored.

FIG. 1 is a block diagram showing the detailed configurations of the graphic processing device 13 and the projection plane conversion processing device 15. The drawing method of the present invention is executed by the orthographic projection conversion processing unit 20 and the projection plane layout processing unit 21. The orthographic projection conversion processing unit 20 is a processing unit that converts the diagonal drawing component shape into an orthographic projection. The projection surface layout processing unit 21 stores the orthographically converted projection surface in the optimal drawing frame area and the graphic data. The data is output to the data file 18. The orthographic projection conversion processing unit 20 includes a rotation projection plane instruction unit 23, a projection plane division processing unit 24, an inter-projection plane element endpoint correspondence processing unit 25, a single line conversion processing unit 27, and a coordinate conversion processing unit 26.

First, the rotation projection plane designating section 23 receives the coordinate information from the tablet 10 and obtains the rotation target angle of the component to be disassembled. The projection plane division processing unit 24 performs group division processing for each projection plane and divides the projection plane into groups for each projection plane. Then, an element end point correspondence processing unit 25 between projection planes
Performs the process of connecting the common end points of the projection planes.

The coordinate conversion processing unit 26 also performs rotational coordinate conversion on the projection surface of the oblique component and arranges it in the orthographic projection direction. For the other projection planes, the movement correction is performed by referring to the respective end points connected before the rotation. The single line conversion unit 27 converts the overlapping elements into a single line by the movement correction.

Next, the structure of the projection plane layout processing section 21 will be described. The projection plane layout processing section 21 includes a drawing size detection processing section 28, a projection plane layout processing section 29, a drawing frame data input section 30 and a file output processing section 31. The output from the file output processing unit 31 is sent to the graphic data file 18 and is also output to the graphic display device 12 via the graphic display processing unit 32. The drawing size detection processing unit 28 determines the optimum drawing frame area in the drawing frames A0 to A4 in consideration of the size of each projection plane, the dimension line, and the space of the annotation input portion.

The projection plane layout processing section 29 rearranges all the projection planes in this area. Thereafter, the drawing frame data determined by the drawing frame data input unit 30 is input. Finally, the part drawing data completed by the file output processing unit 31 is sent to the graphic display processing unit 32 and displayed on the graphic display device 12. Further, it is registered in the figure data file 18 by a confirmation instruction from the keyboard 11.

3 to 7 are explanatory views showing an embodiment of the processing steps of the present invention. First, as shown in FIG. 3, the drafter picks up only the horizontal correction element 41 of the diagonal drawing component shape 42 with the tablet 10. Rotational projection plane instruction unit 2
3 obtains the projection plane rotation angle from the horizontal correction element 41. Next, the projection plane division processing unit patterns the projection planes 43, 44 and 45.
And the element group is divided for each projection plane.

Next, the inter-projection plane element end point correspondence processing unit 25
With reference to the rotation target projection plane 46, the end points 49-50-51 and 52-53-54 of the respective elements with respect to the other projection plane 47.
The association process is performed as in. For another projection plane 48, the element end points are associated with each other 49-55-5.
All the end points are connected to each other so as to be 6, 52-57-58 ... And an end point correspondence table as shown in FIG. 4 is created.

Element numbers 59, 60, 61, 62, ... Associated with each projection plane are recorded in this correspondence table. In this processing, when the corner portion is a circular arc on the reference projection plane 46, the end points are X _min , X _max or Y _min , Y _max of the circumferential portion as shown in FIG.
4, 65, 66.

Next, the coordinate conversion processing unit 26 performs rotational coordinate conversion of the projection surface 46 to a position where the reference line 67 of the projection surface 46 becomes horizontal, and reproduces the projection surface 68 as shown in FIG. Then, with reference to the element numbers of the end point correspondence table in FIG. 4, the end points of the elements of the projection surface 47 having the associated end points of the rotated projection surface 46 are moved to the positions corresponding to the end points of the elements of the projection surface 68. Then, the projection surface 69 is reproduced. Similarly, the same processing is performed on the projection surface 48 to reproduce the projection surface 70. Since the elements 71 to 78 overlap due to the element movement, the single line conversion processing unit 27 leaves one longest element and deletes the other elements. In this way, the orthographic projection conversion process ends, and then the projection plane layout process starts.

FIG. 7 is a diagram showing a processing procedure of the projection plane layout processing. As shown in FIG. 7A, virtual rectangles 90, 91, and 92 are defined by the maximum and minimum XY coordinates of each component on each projection plane 68, 69, and 70. A dimension / note input area 93 is determined between the projection planes by this rectangle, and the projection plane position is moved to obtain the layout 94 shown in FIG. 7B. This size / note input area 93
Can set parameters arbitrarily. Figure 7
As shown in (C), the dimension / note input area 95 outside the projection plane is similarly determined. Parameters can be arbitrarily set also for the size / note area 95.

Next, the drawing frame data input unit 30 determines the minimum drawing frame from the drawing frames of A0 to A4 sizes in which all the projection planes are stored, and the drawing frame data 9 is placed in the determined drawing area.
Enter 6. At this time, if there is a margin in the dimension / note input area 95 on the outside of the projection surface, the note / input area 93 inside the projection surface and the note / input area 95 outside the projection surface are readjusted at the same ratio and laid out evenly. , A state as shown in FIG. 7D is realized.

Next, all projection planes that have been arranged by the file output processing unit 31 are displayed on the screen 97 as shown in FIG. 7 (E), and the drafter confirms whether the file output is possible or not. Output to 18 and the process is completed.

[0024]

As described above in detail with reference to the embodiments, the present invention not only eliminates the work of correcting and adding the shape after disassembling the obliquely mounted parts, but also makes it possible to completely remove the complicated shape. Since there is no need to rewrite it, the number of drafting processes can be reduced. Further, since the transcription error due to the rewriting, correction and addition is eliminated, the drawing quality can be improved and the man-hour for re-correction work due to the transcription error becomes unnecessary. Furthermore, after disassembling a large-sized assembly drawing, the man-hours for rearranging each projection plane to the optimum drawing size are unnecessary, so that there is an advantage that the disassembling work man-hour is significantly reduced and the burden on the drafter is reduced. .

[Brief description of drawings]

FIG. 1 is a CA for realizing a parts drawing creation method of the present invention.
3 is a detailed block diagram of various processing devices in the D device. FIG.

FIG. 2 is a CA for carrying out the component drawing creation method of the present invention.
It is a block diagram showing a schematic structure of a D device.

FIG. 3 is a diagram for explaining an example of a component drawing creation method of the present invention.

FIG. 4 is a diagram showing an example of an endpoint correspondence table created by the present invention.

FIG. 5 is a diagram for explaining a method of determining an end point when a corner portion is a circular arc.

FIG. 6 is a diagram showing a converted projection surface obtained by the present invention.

FIG. 7 is a diagram illustrating a process step of a projection plane layout process according to the present invention.

FIG. 8 is a diagram for explaining a part drawing creation method in a conventional CAD system.

FIG. 9 is a diagram for explaining a conventional shape editing process.

FIG. 10 is a diagram for explaining conventional projection plane alignment.

[Explanation of symbols]

20 Orthographic transformation processing unit 21 Projection plane layout processing unit 23 Rotational projection plane indicator 24 Projection plane division processing unit 25 Inter-projection-plane element endpoint correspondence processing unit 26 Coordinate conversion processing unit 27 Single line conversion processing unit 28 Drawing size detection processing unit 29 Projection plane layout processing unit 30 Drawing frame data input section 31 File output processing unit

Claims (2)

[Claims] 1. In a part drawing creating method in a CAD system for disassembling a single part from an assembly drawing created by CAD to complete a part drawing, correspondence between end points of elements between projection planes of a single part with an oblique expression shape. The first step of performing attachment and the second coordinate conversion of one of the projection planes and the coordinate transformation of the other projection plane while referring to the end points of the elements of the other projection planes associated with each other. A parts drawing creating method in a CAD system, comprising: a step; and a third step of converting overlapping elements into a single line by the coordinate movement conversion. 2. The method for creating a part drawing in a CAD system according to claim 1, further considering a dimension / note input area for each orthographically transformed projection surface created in the third step. A fourth step of laying out each of the projection planes at an optimum position, a fifth step of inputting an optimum drawing frame including all of the laid-out projection planes, and data of all the projection planes that have been arranged And a sixth step of outputting the component drawing in the CAD system.