The Implementation of a Feature-Based Component Representation for CAD/CAM Integration

1994 ◽  
Vol 208 (1) ◽  
pp. 71-80 ◽  
Author(s):  
K Case ◽  
J X Gao ◽  
N N Z Gindy
Keyword(s):  
Process Planning ◽  
Research Work ◽  
Boundary Representation ◽  
Design System ◽  
Assembly Planning ◽  
Ongoing Research ◽  
Manufacturing Planning ◽  
Feature Based ◽  
Feature Based Design ◽  
Component Representation

Recent research and development has the objective of increasing productivity and cost effectiveness by integrating many activities such as design, analysis, process planning, assembly planning and production planning which encompass the entire manufacturing planning and operational control aspects of a manufacturing enterprise. It has been recognized that a key to the integration lies in the determination of a representation scheme for products that can be interpreted for the various needs of these different applications. Geometric (solid) modellers were regarded by many researchers as the appropriate representation, but more recently a features approach has been proposed to enhance the capabilities of solid modellers. This paper introduces ongoing research which is aimed at the development of a feature-based design system for process planning. The system is fully integrated with a conventional boundary representation (Brep) modeller which enhances its modelling capabilities in representing, editing and validating features of components. The main aspects of the feature-based design system are described in detail, such as the feature library, feature taxonomy, feature operations, feature relationships and tolerances. The generation of a detailed data model for transmission to manufacturing planning activities is also described and demonstrated by reference to an example component. A brief indication is given of our parallel research work in using such models as the basis of process planning and process capability modelling.

Development of a Feature Based Design System Using Virtual Reality

1999 ◽  
Author(s):  
Joshua D. Summers ◽  
Alley C. Butler ◽  
Eddy Kuo
Keyword(s):  
Virtual Reality ◽  
Three Dimensional ◽  
Design System ◽  
Naval Research ◽  
Limited Information ◽  
Virtual Reality Environment ◽  
Web Based ◽  
Ongoing Research ◽  
Feature Based ◽  
Feature Based Design

Abstract Virtual reality systems have been developed over the last few years to provide real time, immersive, three dimensional rendering. There have been efforts to utilize virtual reality and other similar approaches for design (Jones, 1996); however, limited information has been placed in the open literature describing the development of systems used specifically for the design of complex products, like naval vessels. As added motivation, features have been widely accepted as a useful paradigm for design purposes, but experience with feature based design in a virtual reality environment has also been limited. With these issues in mind, this paper was written to describe an ongoing research project that focuses on the demonstration of feature based design in a virtual reality environment for submarine design. To support this development, progress to date using the GROTTO, a CAVE like system, at the Naval Research Laboratory is reported. A “spin-off” of the research to web based collaboration is reported, an outline of projected system architecture is provided, and conclusions are drawn regarding the development of the virtual system.

Handling Protrusion Features With Virtual Pockets for Automated Process Planning

1995 ◽  
Author(s):  
Yuan-Shin Lee ◽  
Dhaval Daftari
Keyword(s):  
Process Planning ◽  
Feature Model ◽  
Design System ◽  
Second Stage ◽  
Automated Process Planning ◽  
Negative Feature ◽  
Feature Based ◽  
Automated Process ◽  
Feature Based Design ◽  
Manufacturing Features

Abstract In this paper a two step approach for the transformation of design features to manufacturing features is presented. In the first stage of the proposed algorithm, a methodology for handling protrusion features by the decomposition of the surrounding volume into basic, negative, machinable volumes is discussed. In the second stage called the feature refinement stage, relevant manufacturing information is appended to the negative feature model resulting from the first stage. The proposed methodology can be used to support automated process planning. Practical examples and computer implementation in an object oriented feature based design system are also presented.

Purely Declarative Feature-Based Design With Feature Type Property Maintenance

2004 ◽  
Author(s):  
Dhaval Lokagariwar ◽  
Bernhard Bettig
Keyword(s):  
Design Process ◽  
Research Work ◽  
Building Blocks ◽  
Feature Representation ◽  
Software Systems ◽  
Design Environment ◽  
Design Features ◽  
Planning Algorithm ◽  
Feature Based ◽  
Feature Based Design

Commercial feature-based design systems are based on describing the design model in some form of sequential representation of primitive shapes and operations called features. In these systems, the overall design process, the behavior of building blocks and the characteristics of the final model, are governed by the construction sequence. These systems do not check for the conformity of the final shape with the actual design intent of features, and allow their design and engineering intent to be altered during the design process. The research work presented here describes a new design methodology and feature representation for facilitating a design environment that is independent of any construction order or constraint-based dependencies and provides a mechanism for maintaining design and engineering intent of the design features. The methodology works by dynamically evaluating the features using a planning algorithm such that the validity of each feature is maintained. These are intended to serve as a generic template that can be used to design and develop specific design features and CAD software systems.

Integrated Feature Modeller for Certain Manufacturing Processes

2005 ◽  
Author(s):  
C. Jebaraj ◽  
D. Kingsly Jeba Singh
Keyword(s):  
Process Planning ◽  
Cutting Tools ◽  
Manufacturing Processes ◽  
Second Phase ◽  
Optimal Sequence ◽  
Planning Stage ◽  
System Maps ◽  
Feature Based ◽  
Manufacturing Applications ◽  
Feature Based Design

This work explains the development of an integrated modeler, which is applied in the design-to-manufacturing stages of manufacturing processes namely machining, sheet metal processing and forging. Its system architecture is broadly divided into four modules namely, Feature Based Design (FBD), Virtual Factory Environment (VFE), Process Based Feature Mapping (PBFM) and Process Planning (PP). Feature based design is used for the design, modeling, synthesis, representation and validation of the components for manufacturing applications. New set of features namely integrated features are pre-defined as feature templates and instanced to get / derive the information required for the design-to-manufacturing stages of the components. VFE defines the factory, which provides the database for operations, machines, cutting tools, work pieces etc. The knowledge base of the developed system maps validated features of the component into operation sets in the first phase of the PBFM. Each operation in the operation sets can be executed using different machines and tools in a factory. All these possible choices are obtained in the second phase of PBFM. Genetic algorithm is used to find the optimal sequence of operations, machines and tools for different criteria in the process planning stage. This paper explains the developed system with case studies.

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