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Identification method for three-dimensional computer-aided design (CAD) model intersection manufacture characteristics

A technology of intersecting manufacturing and feature recognition, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as combinatorial explosions, achieve the effect of improving practicability and meeting the requirements of process design

Inactive Publication Date: 2013-06-19
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In order to overcome the shortcomings of combined explosions in the process of generating optimal solutions in the existing automatic analysis methods for part manufacturability, the present invention provides a method for identifying intersecting manufacturing features of 3D CAD models

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  • Identification method for three-dimensional computer-aided design (CAD) model intersection manufacture characteristics
  • Identification method for three-dimensional computer-aided design (CAD) model intersection manufacture characteristics
  • Identification method for three-dimensional computer-aided design (CAD) model intersection manufacture characteristics

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Embodiment Construction

[0022] refer to Figure 1-9 . The specific steps of the 3D CAD model intersection manufacturing feature recognition method of the present invention are as follows:

[0023] Accessibility analysis of processed surfaces. The accessibility analysis of the processing surface mainly deduces the feasible tool axis of the processing surface by analyzing the boundary information in the 3D CAD model. Taking the MBD model as input, a heuristic method is used to analyze the accessibility of the processing surface, which is based on the following rules:

[0024] Rule 1. For flat machining, assume the plane f i Normal vector is n i , then the direction cone can be reached

[0025] Rule 2. For machining of quadratic surfaces (cylindrical, conical, torus, spherical, etc.), assume the quadric surface f i Axial is n i , then the quadric surface can reach the direction cone where n(P) is the surface f i the normal vector at point P;

[0026] Rule 3. For free-form surface r(u,w) p...

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Abstract

The invention discloses an identification method for three-dimensional computer-aided design (CAD) model intersection manufacture characteristics. The identification method for the three-dimensional CAD model intersection manufacture characteristics is used for solving the technical problem that a combinatorial explosion exists in an existing part manufacturability automatic analysis method in a process that an optional solution is generated. According to the technical scheme of the identification method for the three-dimensional CAD model intersection manufacture characteristics, a three-dimensional CAD model expressed by model based definition (MBD) is used as an information input source, firstly a reachability analysis is conducted on each machined face through an illumination-type rule, and the axial space of a feasible cutter of each machined face is ascertained; then with the axial space of the feasible cutter of each machined face as a restraint, a machined face clustering algorithm merging a manufacture semanteme is adopted to construct each of machined area subgraphs; and finally, with each machined area subgraph as a manufacture characteristic trace which is combined together with dimensioning information, the machined area subgraphs are optimized and merged, so that identification of the manufacture characteristics is achieved. According to the identification method for the three-dimensional CAD model intersection manufacture characteristics, the manufacturability analysis is merged in the identification process of the intersection manufacture characteristics, so that the machined faces are identical in the accuracy level. In the characteristic identification process, the influence, on the characteristic identification, of the design semanteme is fully considered and practicality is improved.

Description

technical field [0001] The invention relates to a method for identifying intersecting manufacturing features, in particular to a method for identifying intersecting manufacturing features of a three-dimensional CAD model. Background technique [0002] The document "Computer-Aided Design, Vol.27, No.5, pp.323-342, 1995" discloses an automatic analysis method for part manufacturability. In terms of processing efficiency and other aspects, the optimized feature interpretation is given, and the generated processing technology is evaluated. However, this method does not consider the influence of design semantic information on feature recognition in the process of feature recognition, which will lead to combinatorial explosion in the process of generating optimal solutions. [0003] The concept and method of model based definition (MBD) are gaining more and more attention and favor in the manufacturing industry. MBD directly marks the dimensions, tolerances, technical requirement...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 黄瑞张树生张曦卯张聪聪陈进平
Owner NORTHWESTERN POLYTECHNICAL UNIV
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