Feature-Based Design for Mill-Turn and 3-Axis Machining

1994 ◽  
Author(s):  
D. L. Henderson ◽  
D. C. Anderson
Keyword(s):  
Three Dimensional ◽  
Automatic Process ◽  
Surfaces Of Revolution ◽  
Design Environment ◽  
Hybrid Parts ◽  
Machined Parts ◽  
Cylindrical Parts ◽  
Feature Based ◽  
Feature Based Design ◽  
Turned Parts

Abstract A feature-based design environment for machined parts exploiting the capabilities of mill-turn machining centers is described. Part models for prismatic, turned and mill-turn parts, as well as hybrid parts such as turned parts with prismatic features, are created with parametrically defined features. Two-dimensional (2-D) profile features are used for creating surfaces of revolution for turned parts. Mill-turn features can be added to cylindrical base features, and traditional prismatic features, such as slots and holes, can be used with prismatic or cylindrical parts. Features are hierarchically positioned and oriented in a unified scheme that includes position and form tolerances. The vector-based tolerance representation facilitates interactive three-dimensional (3-D) design and provides information needed by downstream applications, such as automatic process planning and inspection.

A Manufacturability Evaluation and Improvement System

1991 ◽  
Author(s):  
Nicholas J. Yannoulakis ◽  
Sanjay B. Joshi ◽  
Richard A. Wysk
Keyword(s):  
Life Cycle ◽  
Concurrent Engineering ◽  
Knowledge Bases ◽  
Machining Parameters ◽  
Life Cycle Design ◽  
Machined Parts ◽  
Feature Based ◽  
Feature Based Design ◽  
Manufacturability Evaluation ◽  
Quantitative Indicators

Abstract The increasing application of CAE has lead to the evolution of Concurrent Engineering — a philosophy that prescribes simultaneous consideration of the life-cycle design issues of a product. The Concurrent Engineering (CE) systems that have been developed so far have relied on knowledge bases and qualitative evaluations of a part’s manufacturability for feedback to the design engineer. This paper describes a method for developing quantitative indicators of manufacturability. Feature-based design and estimation of machining parameters are used for ascertaining a part’s manufacturing requirements. These requirements are then combined into indices which lead the designer to features that must be redesigned for improved manufacturability. This method is illustrated on a system for rotational machined parts: the Manufacturability Evaluation and Improvement System (MEIS).

Representing Tolerance and Assembly Information in a Feature-Based Design Environment

1991 ◽  
Author(s):  
Rajneet Sodhi ◽  
Joshua U. Turner
Keyword(s):  
User Interface ◽  
Design Environment ◽  
Assembly Design ◽  
Assembly Features ◽  
Feature Based ◽  
The Creation ◽  
High Level ◽  
Feature Based Design

Abstract This paper describes a strategy for representing tolerance information and assembly information in a feature-based design environment. The concept of designing with features is extended to incorporate the specification of tolerance information. This allows appropriate tolerancing strategies to be provided within the feature definitions themselves. Thus a closer connection is formed between features and the functional intent implicit in their use. The concept of designing with features is also extended to incorporate the specification of assembly information, through the use of assembly features which provide a high-level user interface for the creation and modeling of assemblies, and which handle the identification and creation of mating relations between components. Several examples of component and assembly design using this extended feature-based approach are 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.

Integration of Feature Based Design and Feature Recognition

1995 ◽  
Author(s):  
JungHyun Han ◽  
Aristides A. G. Requicha
Keyword(s):  
Artificial Intelligence ◽  
Process Planning ◽  
Feature Recognition ◽  
Uncertain Reasoning ◽  
Machining Features ◽  
Artificial Intelligence Techniques ◽  
On Demand ◽  
Machined Parts ◽  
Feature Based ◽  
Feature Based Design

Abstract Process planning for machined parts typically requires that a part be described through machining features such as holes, slots and pockets. This paper presents a novel feature finder, which automatically generates a part interpretation in terms of machining features, by utilizing information from a variety of sources such as nominal geometry, tolerances and attributes, and design features. The feature finder strives to produce a desirable interpretation of the part as quickly as possible. If this interpretation is judged unacceptable by a process planner, alternatives can be generated on demand. The feature finder uses a hint-based approach, and combines artificial intelligence techniques, such as blackboard architecture and uncertain reasoning, with the geometric completion procedures first introduced in the OOFF system previously developed at USC.

Methodology and Implementation of Dynamic Design Advisor (DDA) in a Feature-Based System

1999 ◽  
Author(s):  
Tridip K. Bardhan ◽  
Venkat N. Rajan ◽  
Abu S. M. Masud
Keyword(s):  
Design Stage ◽  
Design Environment ◽  
Regular Feature ◽  
Part Geometry ◽  
Advisory System ◽  
Systematic Methodology ◽  
Feature Based ◽  
Feature Based Design ◽  
Pipeline Design ◽  
First Time

Abstract Designing right the first time decreases cost significantly. If requirements of downstream activities could be considered during conceptual design, fewer changes would be required later. A design advisory system can provide enough information to the designer to achieve this goal of designing right at the conceptual stage. A systematic methodology for design advising in a feature-based design environment is developed to identify problems at the design stage, and provide the designer the opportunity to correct them. Five pre-conditions are also identified for this methodology. During the development of the part geometry, a multi-digit code is added to every feature. Based on the code, all applicable design rules are checked as constraints and in case of constraint violation, suggestions are generated and presented to the designer. During the design process, the designer can check a design rating, generated from the extent to which the constraints are satisfied. An example session is also presented to illustrate the ten steps of this method. To validate the developed methodology, a DDA system for pipeline design is developed in an actual industrial application. Effectiveness of the DDA methodology is analyzed by comparing the designers’ performance using the feature-based DDA system with performance using a regular feature based system. The performance measures used are: the number of errors in a design and the time taken to complete the design. Statistical results indicate that designers perform better with the DDA system in terms of fewer errors and less time to design.

Representing and Recognizing Features in Mechanical Designs

1990 ◽  
Author(s):  
Susan Finger ◽  
Scott A. Safier
Keyword(s):  
Graph Grammars ◽  
Design Environment ◽  
Geometric Models ◽  
Feature Based ◽  
Geometric Representations ◽  
Design Systems ◽  
High Level ◽  
Feature Based Design ◽  
Structural Engineers ◽  
Rough Surface Finish

Abstract When experts view an object, they perceive it in terms of their own expertise. For example, manufacturers see features that affect the processes used to fabricate a part, while structural engineers see sources of stresses and other features that tend to reduce the life of a part. Features can be geometric, such as slots or chamfers; they can be quantitative, such as distances between holes; they can be functional, such as alignment; or they can be qualitative, such as a rough surface finish. Research in feature-based design systems for mechanical designers has been motivated by the realization that geometric models represent the design in greater detail than can be utilized by designers, process planners, assembly planners, or by systems that emulate these activities. Features provide abstractions to facilitate the creation, representation, and analysis of designs. Our goal is to enable designers to compose mechanical designs from high-level features that embody functional and geometric properties. In addition, we want to provide designers with feedback on the manufacturability, assemblability, functionality, cost, etc. of the design as it evolves. To support this process in an intelligent CAD environment requires the integration of geometric models, analysis tools, and synthesis tools so that all aspects of the design can be considered while it is in progress. We are developing a design environment based on a shared representation of the design in which we can extract and reason about features of the design from different perspectives. Our approach is to represent both the design and the features using graph grammars. By representing the features using the same grammar as the design, we can recognize features by parsing a feature against the graph that represents the design. We are exploring grammars for behavior as well as geometry in order to provide a link between behavioral and geometric representations. In this paper, we focus on the representation and recognition of features.

Form Feature Based Design of Turned Parts

1994 ◽  
Author(s):  
Pantulu V. Avasarala ◽  
Elliot L. Stern
Keyword(s):  
Personal Computer ◽  
Design Intent ◽  
Design For Manufacture ◽  
Low Level ◽  
Interactive Environment ◽  
Feature Based ◽  
Feature Based Design ◽  
Turned Parts ◽  
Effective Design ◽  
Form Feature

Abstract A form feature based modeller implemented on a personal computer is developed to design turned parts. The interactive environment provides the designer with a means of conveying the design intent and functionality without manipulating low-level graphics. Geometric defaults, tolerances, and warnings are embedded in the system and may be expanded for effective design for manufacture. The implementation of the modeller and usefulness of feature based design is discussed. This modeller is implemented in AutoLisp to run within AutoCAD.

SINFONIA: An Open Feature-Based Design Module

1994 ◽  
Author(s):  
J. Ovtcharova ◽  
S. Haßinger ◽  
A. S. Vieira ◽  
U. Jasnoch ◽  
J. Rix
Keyword(s):  
Shape Representation ◽  
Design Feature ◽  
Modular Architecture ◽  
Design Environment ◽  
Design Features ◽  
Cad System ◽  
Feature Based ◽  
Definition Of ◽  
Feature Based Design ◽  
Solid Modeler

Abstract Sinfonia is a module for feature-based design which is configurable to users and applications within diverse CAD environments, particularly in the area of mechanical engineering. Sinfonia has an open and modular architecture that allows to modify and extend existing functionalities, and to integrate new modeling facilities and application tasks. This module enables the users to work with standard pre-defined design features delivered with the module, or to define dynamically their own specific design features during the design session. Furthermore, Sinfonia allows the interactive definition of constraints concerning the product semantics. Definition and administration of constraints in feature-based models provided by a consistency manager is supported to reach semantical correctness of the part models. The main modules of Sinfonia are the Feature Modeler and the Design Feature Manager. The Feature Modeler is responsible for the instantiation of features and the creation of the feature-based model. The Design Feature Manager allows feature data and design processes to be managed in a uniform way. The CAD system environment in which Sinfonia is integrated consists of the following modules: the User Interface System and the Application modules (offering tools for interaction of the user with application specific part models and for communication with external systems and applications, such as NC modules, etc.), the Solid Modeler (responsible for creating the shape representation of the feature-based model), the Consistency Manager (providing services to handle all kinds of different constraints within the design environment) and the Product Database which includes all services for storing and retrieving various product data.

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