23 ème Congrès Français de Mécanique Lille, 28 Août au 1 er Septembre 2017 1 CAD Model Comparison: Manufacturing cost estimation Based On Unified Feature Technology Montasser Billah Letaief a , Mehdi Tlija b , Raoudha Gaha b , Borhen Louhichi a a.LMS, ENISO, University of Sousse, 4023 Sousse, Tunisia b.LGM, ENIM, University of Monastir, 5019 Monastir, Tunisia Borhen.Louhichi@etsmtl.ca Abstract : Each product developed by a company enriched its know-how. So this expertise needs to be highlighted for reuse in modeling of new products. The reuse of acquired knowledge engenders time and money benefits. Thus, this paper proposes a new approach for CAD model comparison basing on an unified feature technology, in manufacturing semantics. This feature modeling is used to facilitate the comparison between a new product and a database of CAD models already mastered. The comparison model allows the reuse of the CAM data and the cost estimation of the new product. In this article, the proposed approach is detailed and a case study is presented to highlight the major contributions. Keywords: CAD Model; geometric entities, unified feature technology, comparison; Digital Mock-Up. 1 Introduction The majority of industrial companies develop their products using different methods. Nerveless, The employ of a (Digital Muck-Up) DMU, from the geometric modeling phase to the marketing phase, remains a common used tool. The DMU is based on the geometric definition for multidisciplinary engineering applications. Over time, the geometric shape evolves according to the customers' needs. Thus, changes in the product shape into the Computer Aided Design (CAD) and / or subsequent phases are required. This evolution will also impact the technical data specific to each discipline (manufacturing, FE calculations, Assembly, etc.). Thus, each modification realized by multidisciplinary actors enriches the geometric model by information. This redundancy and wealth of information drives companies to retain and reuse data that describes reliable and proven products, as well as capitalize on the knowledge gained in the past. The last strategy allows the company to benefit from expertise acquired during the manufacturing of similar product: reduce the cost and the development time of new products as well as circumvent the problems already encountered. Thus, this work presents a new tool, based on an Unified Feature Technology (UFT), allowing the comparison of geometric models in manufacturing semantics.