An Integrated Computer-Aided Modular Fixture Design System for Interference Free Design

Abstract

Abstract In the development of an automated fixture design system, issues such as automated points and elements generation, and interference free design are of great concern to achieve a quality design in a shorter time. The automation of the fixture design process is of great importance in view of the current trend towards an automated manufacturing environment. This paper describes a CAD-based methodology in developing a modular fixture design system using Unigraphics (UG) solid modeler, integrated with a modular fixture element database based on a hole-based IMAO modular fixturing system. Parametric modeling technique has been applied to construct the database. An integrated methodology is introduced to the system where the functions of interactive, semi-automated and automated fixture design system are combined collaboratively in single environment. This provides the flexibility and functionalities in making the design process more efficient. The interactive fixture design module facilitates the designer to select the fixturing faces, points and elements in building a fixture. Semi-automated and automated fixture design modules are built by transforming the designers’ experience and knowledge into rules and algorithms so as to automate the selection of fixturing points and elements. More importantly, the system aims at producing a tool collision-free fixture design using its machining interference detection module based on cutter swept volume approach.