BIW_CLEAN_EDGE_MODELLING-APSSDC

BIW CLEAN EDGE MODEL The clean edge approach is a way to model where part solid edges are the result of CAD operations. The clean edge approach should be a consideration in every modeling operation. Remember, re-usable edges and faces that result from CAD operations are the ultimate goal. Proper application of the clean edge approach provides the user with a model that is free from distorted geometry and creates edges that are easy to fillet. 3D CAD software is common in the product design industry because of the speed, accuracy, versatility, and engineering they contribute to the manufacturing of a product. Depending on the CAD system your company uses dictates the particular methods used in modeling a part. Each system has its own unique modeling tools but most of them follow a common standard, which is they create solid bodies and surfaces. Some companies restrict you to use proven modeling methods or methods that support other activities but it always comes down to shape. This document reviews some of the primary methods used for designing a solid model for BIW. Unlike bodies, you can create a part using mostly all surfaces. Some BIW panels are free flowing and require the surface to be developed using Generative Shape Design (GSD). Surfaces are used to create these complex curvaceous surfaces because it is easier then using solid features. You can create multiple surfaces that have tangent/curvature continuity to one another and that meet coincident to their edges so they can be joined. Each surface can incorporate the required contour for the design. In the end, like a solid that is shelled, a surface is thickened for uniform thickness. To complete the design, you can apply holes and other forms of cutouts to complete the design. This technique is often used for Class-A surfacing but can be adapted to BIW panel design although BIW design does not always use this technique because most panels have more analytical geometric shapes then curvaceous form.