Teacher

prof. Stefano FILIPPI

Credits

6 CFU

Language

Italian

Objectives

This course aims at: showing criteria and basic rules for dimensioning and shaping machine components, mechanisms, and simple mechanical systems; giving knowledge about theory and application of Computer Graphics, related to several 3D CAD systems; using a parametric solid modeler for geometric modeling and drafting of mechanical components and simple assemblies developed starting from the analysis, also functional, of mechanical drafts or observation of real mechanical components or commonly used objects.

Acquired skills

- Dimensioning criteria and lay out of single components and simple mechanical assemblies.
- Knowledge of methods and tools for three-dimensional (3D) solid modelling of industrial products.
- Generation of 3D CAD models by the use of a feature based, parametric solid modelling CAD system.
- Realization of the product technical documentation based on standards and industrial production requirements.

Lectures and exercises (topics and specific content)

3D CAD modelling systems: 3D Representation methods with CAD systems, taxonomy and specific characteristics of the different systems; state of the art and evolution trends in reference to development methods for industrial products (2 hours).
Machine morphology: machines, mechanisms and mechanical components: definitions and generalities; machine layout using correctly elementary mechanical functions, general criteria and industrial and mechanical examples (4 hours).
Functional Analysis of mechanical systems: introduction to functional analysis of simple mechanical systems and parts; study of basic mechanical functions; analysis of simple mechanical assemblies (4 hours).
Element and simple mechanical assemblies dimensioning: single components and simple mechanical assemblies dimensioning and layout, theoretical and functional aspects, technological and manufacturing requirements, management and organizational problems; critical exam of typical mechanical application cases (8 hours).
Curves and surfaces: parametric representation of curves and surfaces; properties and characteristics of the main representation algorithms (Bézier methods, B-spline, NURBS); examples of industrial application cases (3 hours).
Solid models: representation schemes of 3D models, wireframe modelling; parametric feature based modelling; volume decomposition modelling; curves sweeping; constructive solid geometry (CGS); B-Rep modelling; validation criteria for solid models; Euler operators; Boolean operations (4 hours).
Parametric Systems: parametric modelling of family parts; programming, variational and parametric approaches; application examples inside Group technology (2 hours).
Colour: colour representation: for human perception; for technical specification, and for measurement; selection and ergonomic usage criteria of colour in CAD (2 hours).
Rendering and shading: photometric dimensions; lighting models: empiric models (Gouraud; Phong); ray-tracing algorithm and brief description of other models (radiosity etc…) (1 hour).
Data transfer and coding standards: 2D, 3D and Hybrid standards ( DXF, IGES, STEP. The STL format: first tasks and following applications development (2 hours).
Exercises: use of a parametric feature based CAD 3D modeller for the generation of parts, assemblies and drafting, according to UNI ISO standards, of components and simple mechanical systems (themes and execution rules of all the exercises will be described during the course) (18 hours).
Labs (10 hours).

References

- Manfè, G., Pozza, R., Scarato, G., “Disegno meccanico”, voll. 1, 2, 3, Principato Editore, Milano, 1992
- Chirone, E., Tornincasa, S., “Disegno tecnico industriale”, voll. 1, 2, Ed. il Capitello, Torino, 2007
- Bertoline, G., Wiebe, E.  "Fondamenti di comunicazione grafica", McGraw-Hill, Milano, 2002

Type of exam

Written and oral

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