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Method for translating dimensions on two-dimensional engineering drawing to three-dimensional CAD (computer aided design) model

A two-dimensional engineering drawing and size technology, applied in image data processing, special data processing applications, instruments, etc., can solve problems such as low efficiency and achieve the effect of reducing the number of matching times

Inactive Publication Date: 2012-07-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0009] In order to overcome the inefficiency of the existing 3D CAD model dimensioning method, the present invention provides a method for transferring the dimensions on the 2D engineering drawing to the 3D CAD model

Method used

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  • Method for translating dimensions on two-dimensional engineering drawing to three-dimensional CAD (computer aided design) model
  • Method for translating dimensions on two-dimensional engineering drawing to three-dimensional CAD (computer aided design) model
  • Method for translating dimensions on two-dimensional engineering drawing to three-dimensional CAD (computer aided design) model

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Embodiment Construction

[0041] The present invention transfers the size on the two-dimensional engineering drawing to the method specific steps on the three-dimensional CAD model as follows:

[0042] Step 1, carry out the identification of graphic elements and dimensions on the two-dimensional engineering drawing and the association of dimension annotations with graphic elements;

[0043] Step 2, projecting the three-dimensional CAD model to obtain two-dimensional projection views of each projection direction;

[0044] Step 3, performing precise matching of primitives on the projected view and the original two-dimensional engineering drawing;

[0045] Step 4, according to the matching result, the dimensions on the 2D engineering drawing are mapped to the 3D CAD model.

[0046] The 3D dimensioning of 3D models is usually a link with a heavy workload. The 3D model library with 3D annotation can be obtained by dimension mapping of a large number of existing 2D engineering drawings and 3D model librarie...

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Abstract

The invention discloses a method for translating dimensions on a two-dimensional engineering drawing to a three-dimensional CAD (computer aided design) model. The method is used for solving a technical problem that a three-dimensional CAD model dimension marking method in prior art is low in efficiency. The technical scheme of the method is as follows: projecting the three-dimensional CAD model to obtain a projection view of the three-dimensional CAD model; then respectively extracting pixel information of the projection view and the two-dimensional engineering drawing, and respectively representing the projection view and the two-dimensional engineering drawing in a spatial relation drawing structure with a pixel as an apex; and finally carrying out accurate pixel matching on two spatial relation drawings. A test result shows that the method can realize accurate pixel matching and can correctly realize dimension tolerance mapping from the two-dimensional engineering drawing to the three-dimensional model. By using the method, a high-efficiency and intelligent method is provided for a condition that the three-dimensional CAD model and the two-dimensional engineering drawing which are separate in prior arts are translated into a single model with three-dimensional dimension marks.

Description

technical field [0001] The invention relates to a method for dimensioning a three-dimensional CAD model, in particular to a method for transferring dimensions on a two-dimensional engineering drawing to a three-dimensional CAD model. It belongs to the field of computer-aided design. Background technique [0002] With the development of computer technology and engineering software, product definition has experienced the development process from engineering drawing to 2D CAD technology, and then to 3D model technology. More and more commercial software has supported Model Based Definition (MBD, Model Based Definition). The 3D model integrated by MBD fully expresses the method of product definition information, and specifies in detail the labeling rules of product size and tolerance and the expression method of process information in the 3D digital model. At present, the commercial software that supports dimensional tolerance labeling of 3D models includes Unigraphics NX 3D C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T19/00G06F17/50
Inventor 张树生陶俊唐启亮黄瑞范海涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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