JPH0523746A - Three-dimensional shape modeling device - Google Patents

Abstract

PURPOSE:To contrive the practical use of the reduction of a data size, etc., in the shape model of a sheet metal structure body with a computer whose arithmetic capability is low by providing contour data, three-dimensional data of an internal form reference point, and the relating information of a plane and a contour internal form reference point, on a three-dimensional shape model. CONSTITUTION:This device is provided with the two-dimensional shape data file 51 of plane information consisting of the contour data of an X coordinate, a Y coordinate and an attribute and internal from data of a shape code, etc., and connecting the information of the bending kind for connecting each plane, etc. Also, the device is provided with an input means for fetching the data to a storage/processor 5 from this file 51, and an approximation processing 42 for executing a polygonal operation of a circular arc in the contour with respect to the inputted two-dimensional shape data. Moreover the device is provided with the three-dimensional conversion processing part 43 of a contour/inside diameter reference point for generating relating information of three-dimensional shape data and the plane, and a contour internal shape reference point, a three-dimensional shape model file 52 for storing its processed data as information, and a display means for outputting it to a CRT 1. In such a manner, the data size is reduced by a computer whose arithmetic capability is low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional shape modeling device for a sheet metal structure.

[0002]

2. Description of the Related Art A conventional three-dimensional shape modeling device can be divided into three types of models: a wire frame model, a surface model, and a solid model. In the wire frame model, it is represented by the information of a line which is a list of edges and the coordinates of both points which are a list of vertices of the line.
On the other hand, the surface model is a wireframe model with surface information added.
In the model, boundary representations that give directions to surfaces in the surface model and “CUBE”, “WEDGE”,
"CYLINDER", "TETRAHEDRON",
It is possible to express shapes by combining rotation, movement, sum, difference, product, and assembly of basic solids (primitives) such as “SEGMENT” and “FILET”.

[0003]

In the above-described three types of conventional shape modeling apparatuses, the wire frame model has a simple representation and a simple processing, but it lacks information to represent a solid and is hidden. There is a drawback that it is not possible to create a figure that has been subjected to line erasing processing or to obtain so-called mass properties such as weight and center of gravity. In addition, the surface model can display the figure with hidden lines removed, find the line of intersection between the surfaces, and analyze the geometric properties of the surface such as surface area. Cannot get property. In addition, in solid models, there are a wide range of application fields such as obtaining mass properties such as weight and center of gravity, making cross-sectional views, and mesh division for FEM, which were not possible with surface models. There are drawbacks such that the complexity and data size become too large to be processed by a large computer.

[0004]

A three-dimensional shape modeling device of the present invention is a contour data consisting of an X coordinate, a Y coordinate and an attribute, and a shape code, a shape angle, a shape parameter, an arrangement code, and an internal shape consisting of an arrangement parameter. It has plane information composed of data and connection information consisting of a bending type, a bending angle, a bending radius, and a bending direction for connecting the planes to each other.
A two-dimensional shape data file, input means for loading the two-dimensional shape data file into the storage / processing device, and two-dimensional shape data loaded into the storage / processing device by this input means for polygonal calculation of an arc within a contour. An approximation processing unit, and a three-dimensional conversion processing unit for contour-inside shape reference points, which generates three-dimensional shape data and relationship information between planes and contour-inside shape reference points
Data of this three-dimensional conversion processing unit is stored as information 3
A three-dimensional shape model file and output means for outputting the data of this three-dimensional shape model file to a CRT are provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a three-dimensional shape modeling apparatus according to an embodiment of the present invention. 2 (a) to 2 (e) and FIGS. 3 (a) and 3 (b) are explanatory views of respective data taking a sheet metal structure as an example. In the embodiment shown in FIG. 1, peripheral devices such as a CRT 1, a keyboard 2 and a mouse 3, a disk unit 4 accommodating the data file of the present embodiment, and 2D data reading 3
It is composed of a storage / processing unit 5 which performs a dimension conversion process and writes it in a three-dimensional data file.

First, the disk unit 4 stores a two-dimensional shape data file 51 in which plane information consisting of contour data and inner shape data and connection information between planes are recorded, and a three-dimensional shape model file 52 of output data. Also, memory
The processing unit 4 includes a two-dimensional shape data reading unit 41, a polygon approximation processing unit 42 for a circular arc within a contour, a three-dimensional conversion processing unit 43 for contour / internal reference points, and a three-dimensional shape model writing unit 44.
Composed of.

Next, the operation of this embodiment will be described by taking as an example a sheet metal structure in which planes A and B shown in FIG. 2A are connected at a right angle. The data read by the two-dimensional shape data reading unit 41 from the two-dimensional shape data file 51 is represented on the CRT 1. FIG. 2B shows a plane A
The points 1 to 9 are displayed by XY coordinates. As shown in FIG. 2 (c), this contour data indicates the point No. The X-coordinate and Y-coordinate numerical values and the linear shape to which the point belongs are divided into four attributes of straight line, circular arc (1), circular arc (2), and center, which are represented by 0, 1, 2, and 3, respectively.
Therefore, in the case of the plane A, as shown in FIG. 2C, points 1 to 4 are straight lines 0, 5 and 7 are arcs 2, and 6 is the center. Also in the contour data of the plane B of FIG. 2D, as shown in FIG. 2E, points 1 to 4 are similarly expressed by X and Y coordinates and attributes, and all points 1 to 4 in this case are represented. It is represented by the straight line 0. The square hole in the plane B, which is the inner shape data, is expressed as the inner shape data as shown in FIG. Ie 8
Express with items. Here, the shape code is given by a square (202) or a circle. As for the arrangement code, the code is assigned according to only one one-point arrangement (301) or two or three. Next, there is bending data as data of a three-dimensional figure. As shown in FIG. 3A, the bending type, bending angle,
Specify three types of bending radius. In the case of FIG. 2A, R
No bend, angle 90 degrees bend radius 0. Next, the designation of the connection data for connecting the plane A and the plane B is designated, for example, as shown in FIG. PLANE · NO indicates the number of planes, N · POINT indicates the number of points on each plane, N · LINK indicates the number of links serving as a connecting portion of each plane, and LINK · DP indicates the data storage start address. Even when there is an R portion in the bend, an R surface is generated by the polygon approximation processing, the planes A and B are three-dimensionally developed, and output on the CRT as shown in FIG. 2A. The thick line portion represents the data in the three-dimensional modeling, and the contour data is represented by the center value of the plate thickness surface. Also, the dotted line part is
It is generated by performing a correction of ± 1/2 plate thickness on the thick line plane. That is, the stereoscopic information of the sheet metal structure can be expressed only by the information of the thick line portion.

[0009]

As described above, according to the present invention, in the three-dimensional shape model based on the center value of the plate thickness surface, contour data,
By having the tertiary data of the internal reference points and the relationship information between the plane and the contour internal reference points, the reduction of the data size in the shape model of the sheet metal structure can be put to practical use even in a computer with low computing ability. effective.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a completed drawing of a three-dimensional figure (a), two-dimensional figures (b) and (d), and data (c) and (e) of each two-dimensional figure of the present embodiment.

FIG. 3 is an explanatory diagram of three-dimensional data according to this embodiment.

[Explanation of symbols]

1 CRT 2 keyboard 3 mice 4 disc section 5 Memory / Processing Unit 41 Two-dimensional data reading section 42 Polygonal approximation processing unit for arcs in contour 43 Contour / internal shape reference point three-dimensional conversion processing unit 44 Writing section for three-dimensional shape model 51 Two-dimensional shape data file 52 3D shape model file

Claims (2)

[Claims] 1. Plane information consisting of contour data and shape code consisting of X coordinate, Y coordinate and attribute, shape angle, shape parameter, arrangement code and internal shape data consisting of arrangement parameter, and a bend connecting the planes. Seed, bending angle,
A two-dimensional shape data file having connection information consisting of a bending radius and a bending direction, input means for loading the two-dimensional shape data file into the storage / processing device, and this input means for loading into the storage / processing device. An approximation processing unit for calculating a polygon of a circular arc in the contour of the two-dimensional shape data;
A three-dimensional conversion processing unit for contour-inside contour reference points, which generates three-dimensional shape data and relationship information between planes and contour-inside contour reference points;
A three-dimensional shape modeling device, comprising: a three-dimensional shape model file that stores data of the dimension conversion processing unit as information; and an output unit that outputs the data of the three-dimensional shape model file to a CRT. 2. The contour data is represented by a center value of a plate thickness surface, and the center value is corrected by ± 1/2 plate thickness to display an outer three-dimensional shape having the plate thickness. The three-dimensional shape modeling apparatus according to claim 1, characterized in that.