Plenary Lecture

A Topological Approach of the Geometry Modeling
and Control in Manufacturing

Dr. Virgil Teodor
Manufacturing Science and Engineering Department,
“Dunarea de Jos” University of Galati, ROMANIA
E-mail: virgil.teodor@ugal.ro

Abstract: Nowadays, the globalization of the economy, science, technology and society leads to an strengthened influence of the customer requirements having as a consequence the need for a higher level of the product quality.
In manufacturing, the quality assessment tends to be performed in real time and to be integrated in the product manufacturing process. Nowadays, modern machine tools are able to generate complex surfaces and consequently the main issue is not the surfaces processing but the surfaces geometry modeling and control.
The dimensional control issue is one of the most important because of the customized small batch production according to the customer requirements. It is noticed that the deviation compensation strategy tends to replace the error reducing strategy. Based on the computer technology development, new computer aided manufacturing systems occurred which has an embedded computer aided inspection system within which the information is digitally processed.
In this new context, the Euclidian geometry – that basically supports the classical dimensional control – becomes inappropriate for this application. The recent literature reports two main approaches concerning generation, measurement and tolerancing of the part geometry. The first one is represented by continuous monitoring of the workpiece during the processing and the second one is based on dimensioning tolerancing of part functionality. Also, from literature review it is obvious that no generalized approach concerning generation, inspection and tolerancing of the mark guide mark surfaces with respect to the surfaces in their assembly location hasn’t exist. This is why, it is correct to state that nowadays standards does not corresponds to the most recent evolution in design and machine tool market.
This lecture presents the analysis of the mechanical structures geometry through topological geometry aiming to replace the singular surface analysis with surfaces assembly modeling and control, using a topologic approach. In this way, superior results would be acquired in what concern precision and the possibility of correction, comparing with the case obtained with the surfaces one by one inspected.

Brief Biography of the Speaker:
Dr. Virgil Teodor graduated Faculty of Mechanical Engineering of “Dunarea de Jos” University of Galati in 1994. In 2000 he graduated the degree program of Master in "Numerical Modeling of Mechanical and Technological Processes". In 2005 he obtained the title of Doctor Engineer. From 1994 to 2002 he worked as design engineer at “Uzinsider Engineering”. Since 2002 he followed the academic carrier at “Dunarea de Jos” University of Galati as associate assistant, assistant and lecturer at The Department of Manufacturing Science and Engineering. In 2005 Dr. Teodor followed a 3 months research stage at Technical Superior School of Valladolid, Spain.
His research fields are connected with:
- cutting process modeling;
- surface generation with cutting tools which work by enveloping;
- algorithms for the study of surfaces generation methods.
Dr. Teodor published 50 articles in journals and internationals conferences proceedings and he is author and co-author of 3 books in his research field.
In 2008 he developed a short research stage at Technical Superior School of Valladolid, Spain, in the field of surface identification using 3D measuring machines. Dr. Teodor is an organizing committee member of “New Technologies in Manufacturing – NEWTECH 2009” International Conference. The research activity of Dr. Teodor includes 6 research contracts financed by Romanian Ministry of Education and Research, as director or team member. Dr. Teodor is also a member of The Romanian Scientific Association for Nonconventional Technologies - ARTN.