An integrated approach to collision-free computer-aided modular fixture design

This paper describes a CAD-based methodology for developing a modular fixtu re design system using the Unigraphics (UG) solid modeller, integrated with a modular fixture element database, based on a hole-based IMAO modular fix turing system. A parametric modelling technique has been applied to constru ct the database. An integrated methodology is introduced in the system in w hich the functions of interactive, semi-automated and automated fixture des ign systems are combined collaboratively in a single environment. This prov ides the flexibility and functionality for making the design process more e fficient. The interactive fixture design module helps the designer to selec t the fixturing faces, points and elements for building a fixture. Semi-aut omated and automated fixture design modules are built by transforming the d esigners' experience and knowledge into rules and algorithms to automate th e selection of fixturing points and elements. More importantly, the system aims at producing a tool-collision-free fixture design using a machining in terference detection submodule based on a cutter swept volume approach.