JP3038617B2 - 2D mechanism CAD device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sectional performance analysis using a two-dimensional mechanism CAD, and more particularly to a processing method for recognizing a sectional shape.

[0002]

2. Description of the Related Art FIG. 2 shows an example of the configuration of a conventional two-dimensional mechanical CAD apparatus. 2D shape input unit 1 for inputting 2D shape, 2 for storing input 2D shape data
It is composed of a two-dimensional shape storage unit 2, a figure display unit 3 for displaying shapes, a figure drawing unit 4 for drawing shapes, and a two-dimensional shape editing unit 5 for deleting, moving, and rotating two-dimensional shapes. It is used for speeding up, speeding up, improving quality, standardizing design, eliminating design errors, and streamlining production preparation.

[0003] Among the above-mentioned objects, in particular, in design verification for analyzing the cross-sectional performance (area, center of gravity, cross-sectional secondary moment, cross-sectional modulus, etc.) of a member used for a structure of a mechanical system at a design stage, two-dimensional analysis is performed. The cross-sectional shape to be analyzed is read by hand with reference to the conceptual design drawing input by the shape input unit, and is manually calculated. The results of the cross-sectional performance obtained here are used for the examination of the strength and the examination of the load of the rotating body.

[0004]

However, the above-described method has a problem that a large number of man-hours are required for the work of reading the cross-sectional shape required for analyzing the cross-sectional performance and the work of calculating the cross-sectional performance relying on humans. However, it was not practically satisfactory during a design work requiring a cross-sectional performance analysis (design verification).

According to the present invention, in order to reduce the number of steps of the cross-sectional performance analysis (design inspection) described above, the cross-sectional performance analysis can be performed by a simple operation during the designing work using the two-dimensional mechanism CAD, and the work efficiency is excellent. An object is to provide a two-dimensional mechanism CAD device.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a two-dimensional mechanical CAD apparatus as shown in FIG. A cross-sectional shape recognition unit 11 having a cross-sectional shape specification function, a cross-sectional shape shaping function, a configuration surface extraction function, and a non-analysis configuration surface specification function for the obtained two-dimensional data, and a cross-section shape storage for storing the analyzed cross-section shape data Section 12 and section performance calculation section 13 for calculating section performance from a designated section shape
And an analysis result storage unit 14 for storing analysis result data.
Is provided.

[0007]

According to the present invention, by adding the above-described parts, a cross-sectional shape to be analyzed is designated and surrounded (cross-sectional shape specifying function), and the specified cross-sectional shape is automatically formed (cross-sectional shaping function). It is possible to extract a constituent surface of a target designated cross section from the cross sectional shape (configuration extracting function), specify a non-analytical constituent surface, and store the cross sectional shape data. By automatically calculating the sectional performance (design verification) based on the stored data and storing the analysis result, the analysis result can be used immediately when necessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the block diagram of FIG. The two-dimensional mechanism CAD device of the present invention includes a two-dimensional shape input unit 6 for inputting a secondary shape, a two-dimensional shape storage unit 7 for storing the input two-dimensional shape data, and a graphic display unit for displaying the shape. 8, a figure drawing unit 9 for drawing a shape 9, a 2D shape is deleted, moved, rotated, etc. 2
A three-dimensional shape editing unit 10, a cross-sectional shape recognition unit 11 for specifying a cross-sectional shape to be analyzed from the input two-dimensional shape, a cross-sectional shape storage unit 12 for storing cross-sectional shape data to be analyzed, and a cross-sectional performance based on the specified cross-sectional shape. Section performance calculation unit 1 to be calculated
3. Analysis result storage unit 14 for storing analysis result data
It consists of. Of these, the part 15 added in the present invention is:
The four parts are a cross-section shape recognition unit 11, a cross-section shape storage unit 12, a cross-section performance calculation unit 13, and an analysis result storage unit 14.

The procedure for analyzing the sectional performance of the present invention will be described with reference to FIG. Input by the two-dimensional shape input unit 6 (step S
T1) The cross-sectional shape to be analyzed is extracted from the concept design drawing 16 (two-dimensional data) by operating the cross-sectional shape recognition unit 11 (step ST2), and analyzed by the cross-section performance calculation unit 13 (step ST3). The analysis results are displayed on the graphic display unit 8 as analysis results 17 and 18 (step ST).
4).

The cross-sectional shape recognition unit 11 of the present invention is connected to the two-dimensional shape storage unit 7 so that it can be recognized at any time during the so-called two-dimensional shape input operation at the concept design stage.

FIG. 4 shows two-dimensional shape 19a and two-dimensional shape data 19, designated sectional shape 20a and designated sectional data 20,
FIG. 9 is a diagram showing the configuration surface 21a and the configuration surface data 21 in association with each other, and showing the data 22 as a result of the cross-sectional performance calculation. The two-dimensional shape data 19 (S1 to Sn) is stored in the two-dimensional shape storage unit 7.
Next, the specified sectional shape data 20 (S1, S2, S
···) and constituent surface data 21 (f1, f2,
..) are stored in the cross-sectional shape storage unit 12. Data 22 analyzed by the cross-section performance calculation unit 13
(Area, center of gravity, secondary moment of section, section modulus, etc.) (R
1, R2, R3,...) Are stored in the analysis result storage unit 14.

The table structure of the two-dimensional shape data 19 and the designated cross-sectional shape data 20 is the same, and the element types of the shape (straight line, circle, arc, etc.) start point, end point, center coordinates,
With respect to information such as a radius, the constituent surface data 21 is information such as group information of the designated sectional shape, outer shape, inner diameter, and the like. The analysis result data 22 is information such as the area of the cross section, the position of the center of gravity, the secondary moment of the cross section, and the section modulus. The cross-sectional shape recognizing unit 11, which is a feature of the present invention, operates based on the data tables stored in the storage units described above.

Next, a procedure for recognizing a cross-sectional shape according to the present invention will be described with reference to FIG. First, the cross-sectional shapes 23 and 23a to be analyzed
From the conceptual design drawing 24 (two-dimensional shape data)
5 and the polygon region 26 are extracted by designation (step ST5). For details, as shown in FIG. 6, when the rectangular area 35 is specified, the two-dimensional shape data 38 included in the end point coordinates 37 of the rectangle or when the polygonal area 39 is specified, the data is included in the side 40 of the polygon. The two-dimensional shape data 41 is the data to be designated. Next, automatic shaping 27 of the designated cross-sectional shape is performed (step ST6). Automatic shaping means trimming a specified cross-sectional shape 42 having an unconnected end point to the nearest intersection point 44 in the specified cross-sectional shape 43 as shown in FIG.
5 means to do.

Next, the surfaces 29 to 32 composed of one loop type 28 are extracted from the automatically shaped designated sectional shape 27. FIG. 8 shows an extraction example, in which the constituent surface extraction scanner 4
6 calculates the scan start point 47 and scans the shape.
8. If there is a point 49 where the shape branches, the shapes 50 and 51 connected to the branch point 49 are extracted, the angle 53 with the shape 52 being scanned is obtained, and the shape on the smaller angle side in the counterclockwise direction is obtained. Scanning proceeds to 51. When these are repeatedly returned to the scan start point, the first branch point is set as the next scan start point 49. As described above, all the constituent surfaces are automatically extracted (step ST7).

Next, a structure is obtained in which a component surface not to be analyzed is designated 33 from the extracted component surfaces (step ST8), and the sectional performance of the finally remaining component surface 34 is calculated.

[0016]

As described above, according to the present invention, the following effects can be expected. Two-dimensional mechanism CA
With the D device, it is possible to specify the cross-sectional shape by simple operation during the concept design, so that the cross-sectional performance calculation is automated, and the conventional cross-sectional performance analysis work relying on manual labor is greatly simplified, Analysis can be performed instantaneously, and work efficiency and quality improvement of mechanical design by CAD can be expected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a two-dimensional mechanism CAD apparatus of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional two-dimensional mechanism CAD device.

FIG. 3 is a diagram showing a procedure for analyzing cross-sectional performance of the present invention.

FIG. 4 is a diagram showing each shape and internal data structure of the present invention.

FIG. 5 is a diagram showing a sectional shape recognition procedure of the present invention.

FIG. 6 is a diagram showing an example of specifying a cross-sectional shape according to the present invention.

FIG. 7 is a diagram showing an example of shaping a designated cross-sectional shape according to the present invention.

FIG. 8 is a diagram illustrating an example of extracting a constituent surface of a designated cross section according to the present invention.

[Explanation of symbols]

 6 2D shape input section 7 2D shape storage section 8 Graphic display section 9 Graphic drawing section 10 2D shape editing section 11 Cross section shape recognition section 12 Cross section shape storage section 13 Cross section performance calculation section 14 Analysis result storage section

Claims (1)

(57) [Claims] 1. A two-dimensional shape input unit for inputting two-dimensional data, a two-dimensional shape storage unit for storing the two-dimensional data,
In a two-dimensional mechanism CAD device including a graphic display unit for displaying a shape, a graphic drawing unit for drawing a shape, and a two-dimensional shape editing unit for deleting, moving, and rotating a two-dimensional shape, input two-dimensional data. A cross-sectional shape recognition unit that has a cross-sectional shape specification function, cross-sectional shape shaping function, component surface extraction function, and non-analysis component surface specification function, and a cross-section shape storage unit that stores analyzed cross-sectional shape data A cross-section performance calculation unit that calculates the cross-section performance from the cross-section shape and an analysis result storage unit that stores the analysis result data are provided.The cross-section performance calculation is automatically performed by designating the cross-section shape to be analyzed during design work. A two-dimensional mechanism CAD apparatus, wherein a result is displayed on the graphic display unit.