Explicit reference modeling methodology in parametric CAD system

• We depict the few CAD modeling methods in constraint-based CAD systems.
• CAD modeling procedures are required for efficient parametric CAD.
• Proposition of a modeling methodology for complex parts based on explicit references.
• Examples of implementation from CAD training in university and in the automotive industry are presented (centering screw support, plastic carter, radiator tank).

Today parametric associative CAD systems must help companies to create more efficient virtual development processes. While dealing with complex parts (e.g. the number of surfaces of the solid) no CAD modeling methodology is existing. Based on the analysis of industrial designers' practices as well as student practices on CAD, we identified key factors that lead to better performance. Our objective in this article is to propose a practical method for complex parts modeling in parametric CAD system. An illustration of the performances and the results obtained by this method are presented comparing the traditional method with the proposed one while using an academic case and then an industrial case.