CAD/CAM Principles and Applications - Geometric Modelling By P N Rao
File Type : PDF
Language : English
Description
Information entered through geometric modeling is utilized in a number of downstream applications such as drafting, manufacturing, inspection and planning. Geometric models are three types, viz line model, surface model and solid model. Line model though simple is rarely used because of the ambiguity present. Surface and solid models are extensively used in industrial applications. Among the geometric construction methods sweep or extrusion is most widely used, because of its simplicity and elegance in developing 3D models.
Form features is another form of modeling system that helps in designing CAD systems with more intelligence built into the geometric entities that is possible by purely geometric systems discussed thus far. The mathematical representation of the geometric entities can be in implicit or parametric form, the latter being the preferred method used in CAD systems because of its easier adaptation in software development. The curve representation methods can be extended for surface representations such as used in free form surfaces. A number of modeling facilities need to be considered while selecting a CAD/CAM system for any given application. Rapid prototyping is used to generate the product directly from the 3D CAD model data. A number of different processes such as stereo lithography, selective laser sintering, 3D printing, fused deposition modeling, laminated object manufacturing, are used for this purpose.
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