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Product documentation for feature extraction and modeling

Author: ZhangZhiWei
Tutor: WangTaiYong
School: Tianjin University
Course: Mechanical Manufacturing and Automation
Keywords: Product-oriented L-H mode Feature Extraction Features Blocks ISO 14649
CLC: TP391.72
Type: PhD thesis
Year: 2009
Downloads: 149
Quote: 1
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Abstract


With the industry to speed up the process of information, numerical control technology has been widely applied, the new data from the control interface specification STEP-NC is an extension of STEP in the manufacturing sector, which has the same geometry as STEP description in the form of solution Traditional data interface ISO 6983 CNC programming limitations issue. In this paper, the swap file for the object, feature extraction to product information and modeling problem is studied. For information appearing in modeling large and complex problems such as handling problems, this paper presents elements from the low-end to high-end elements of information extraction mode (LH mode), and the model used in STEP-NC file information extraction process of medium. Use this mode to reduce the final data model information redundancy, information storage space saving, easy to generate a list of related elements, and is conducive to the unity of product information acquisition and management, product model is easy to maintain. Swap file exists in the boundary description of the product, in order to make full use of this information, the paper in the formulation of the relevant information for further analysis, based on the proposed boundary information based feature extraction methods, and use it for STEP -NC operation among the documents show. This method makes full use of the product model boundary information, by means of the relevant elements of the list traversal realize the feature extraction. This method can save product model for determination of all edges uneven amount of computation, simplify product feature model construction process. How to effectively and quickly complete different product model information exchange between, product information management is to achieve an important part. This article is intended characteristics and related elements, proposed the concept of feature block and block objects used in different product characteristics exchange of information between the model being. Characterized as the basic units to each product model, classify the information associated with the integrated and stored in the feature block data structure. The feature block as a tool to build connections between the various product models interactive flow of information platform, based on the characteristic parameters of the model changes and updates. Based on the swap file representation, element defines the mapping of key technologies such as analysis, discusses the geometrical product information model, product information model, product feature model, product visualization model and product tolerance model specific definition of form and methods to achieve. Create a simple characterization of product characteristics for a model system and product-oriented data management system. And flanges and other products, for example, verify the flow of information between the model and the model is feasible.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Machine-assisted technology > Machine -aided design (CAD), aided drawing
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