摘要：Benefiting from advances in feature technology for design and manufacture can not be expected before a formal methodology is established. This paper makes attempt to establish a definition formalism of machining features in design for manufacturability from two aspects: formal definition and manufacturability analysis. Some definitions for machining feature based upon the selection and sequencing of material removal operations for component in accordance with the design geometry are presented and a framework of feature based design for manufacturability is outlined correspondingly. The proposed scheme contributes to several aspects of feature based CAD/CAM integration, especially to encourage potentially a more generic approach to the automation of design.

摘要：This paper presents methodologies and technologies of feature_based integrated product designing and manufacturing system for CE(Concurrent Engineering) application. The product information is represented on the basis of hierarchical and dynamic structure of feature representation. The Object_Oriented feature modeling method is adopted to represent the feature classification, feature relationship and feature interaction. The set of knowledge_based rule for process planing and manufacturiability evaluation is provided and can be shared by all stages of full product life_cycle. The feature_based machining operation and machining sequence can be determined automatically. The machining process of the machining feature can be determined according to the set of knowledge_based rule.

摘要：The paper presents a promised way of feature recognition from 2D engineering drawing——developing special system and extracting features from machining drawings. In general, researchers inclined to extract features from design drawings and ignored machining drawings. Actually, both of machining and design information shows the same importance in developing new products. Not only can machining drawing provide us with feature model or 3D geometrical model of the part, but also they can be easily recognized. In the paper the processes and methods of feature recognition from three-cone-bit (A Kind of aiguilles used to drill oil well) machining drawings are introduced. Firstly, overall approach is explained. Secondly, two methods of form feature recognition are introduced: symbol-matching method used to analyze annularity or chained graph and method based on feature-hint used to recognize the general features. Thirdly, feature parameters are extracted. Finally, a practical implementation is given.