Codice identificativo insegnamento: 095840
Programma sintetico: TECNOLOGIA MECCANICA 2
Aspetti generali relativi ai processi di
lavorazione non convenzionali: principi fisici, modellazione,
applicazioni. Tecnologia laser: generazione e caratteristiche del fascio
laser, interazione laser-materia, processi (taglio, saldatura,
trattamento termico, marcatura, riporto), sistemi laser. Tecnologia
water jet: generazione e caratteristiche dei getti liquidi ad alta
pressione, parametri e qualità della lavorazione, intensificatori di
pressione. Altri processi di tipo termico (taglio plasma,
elettroerosione, lavorazioni electron beam / ion beam) e meccanico
(lavorazioni a ultrasuoni). Lavorazioni chimiche ed elettrochimiche.
Tecnologia delle microlavorazioni meccaniche: processi di asportazione
del materiale in ambito micro, macchine, applicazioni, modelli di
formazione del truciolo.Scelta e valutazione economica dei processi di
lavorazione non convenzionali.
Classification framework for
both traditional and advanced manufacturing processes. Classification
and overview of special processes, based on the type of energy applied
(thermal, mechanical, electrochemical, etc.) and the tool as a “beam” of
energy. General modelling of processes and systems. Distinctions and
feature of physical, logical and mathematical (analytical, numerical,
empirical) models.
THERMAL PROCESSES
Thermal modelling. Review of fundamentals of heat transfer. The
heat equation and its practical applications in thermal machining and
heat treatments. · Laser beam processing. Fundamentals of the physics of
lasers: stimulated emission, properties of the laser beam. The
technology of laser generation (sources) and transmission (optics, glass
fibres). Interaction mechanisms between the laser beam and the
engineering materials. Laser beam machining by fusion, melt and blow,
vaporization and ablation. Laser beam (conduction and keyhole) welding.
Other applications of lasers. · Additive manufacturing processes.
Overview of the main processes/systems for metals (SLM, EBM, etc.).
Product quality and examples of applications. · Electro discharge
machining. The technology of EDM by plunge and wire. The mechanism of
material removal by spark erosion. Process parameters influence and
cutting quality. Applications. · Plasma arc processing. Properties of
plasmas. The technology of plasma beam generation: historical evolutions
of plasma torches. Process parameters influence and cutting quality.
Other applications of plasmas.
MECHANICAL PROCESSES
Waterjet processing. Introduction to pure and abrasive waterjet
machining. The technology of WJ/AWJ systems: pumps and pressure
intensifiers, the cutting head and its components. Modelling the jet
formation and the interaction mechanisms between the jet and the
engineering materials. Process parameters influence in AWJ machining and
cutting quality. Empirical modelling and cost optimization of waterjet
machining. · Flexible forming processes. Hydroforming of tubes: systems,
loading curves, forming mechanisms and main applications. Fluid and
flexible forming of sheets: systems and applications. · Ultrasonic
processing. The technology of vibrations generation: electromagnetic and
piezoelectric transducers, the sonotrode. Interaction mechanisms between
the tool, the abrasive slurry and fragile materials. Main applications
of the process. The process of ultrasonic welding: process parameters
and applications. · Micromachining. Main differences between traditional
machining and ultra-precision machining. Typical tolerances and
application of micromachining. Examples of systems.