Portale della Didattica

Fundamentals of machine design and drawing

01NLFLI, 01NLFLN

A.A. 2018/19

Course Language

Inglese

Degree programme(s)

1st degree and Bachelor-level of the Bologna process in Ingegneria Dell'Autoveicolo (Automotive Engineering) - Torino
1st degree and Bachelor-level of the Bologna process in Ingegneria Dell'Autoveicolo - Torino

Course structure

Teaching	Hours
Lezioni	69
Esercitazioni in aula	30
Esercitazioni in laboratorio	21

Lecturers

Teacher	Status	SSD	h.Les	h.Ex	h.Lab	h.Tut	Years teaching
Belingardi Giovanni	Professore Emerito		51	0	0	0	8

Co-lectures

Espandi

Teacher	Status	SSD	h.Les	h.Ex
Cavatorta Maria Pia	Professore Ordinario	IIND-03/A	0	30
Ciardiello Raffaele	Ricercatore a tempo det. L.240/10 art.24-B	IIND-03/A	0	30
Ferrero Federico	Docente esterno e/o collaboratore		18	0

Context

SSD	CFU	Activities	Area context
ING-IND/14 ING-IND/15	8 4	B - Caratterizzanti B - Caratterizzanti	Ingegneria meccanica Ingegneria meccanica

Date d'appello

Orario delle lezioni

Statistiche superamento esami

Course description

The course aims at providing further notions/ concepts/knowledge to what was learned in the base course of mechanical drawing. The course provides the basics on CAD systems, on the methods for using such systems, on the possibility of integration and on the lines of evolution of IT systems to support the design and documentation phase. The course also aims at providing the fundamentals of machine component design and analysis, with particular reference to machine components used in vehicles and to their integration into complex systems. Strength of materials under static, dynamic, thermal and fatigue loads is also part of the course objectives.

Expected Learning Outcomes

Students are expected to develop the operative ability of using a system of the latest generation for three-dimensional modeling . Students are also expected to acquire the knowledge related to the methodologies for the design of some of the major elements of machines and of mechanical systems, taking into account the different types of applied loads (mission) and their interaction with other parts of the same machine (system).

Pre-requirements

Engineering Drawings Fundamentals of informatics or Computer Science Fundamentals of strength of materials, Applied mechanics, Science and technology of materials or Technology of metallic materials

Course topics

Computer Aided Design e Manufacturing (CAD/CAM) Il processo di sviluppo di un progetto. Generalità sui sistemi CAD-CAM: Oggetti fisici, modelli e rappresentazioni. Tecnologie di base: Computer Graphics; Image processing, Modeling, Pattern recognition. Tecnologie per produrre oggetti fisici: processo CAM e Rapid Prototyping. Cenni sulle tecnologie di Reverse Engineering. La modellazione geometrica e Feature based Curve e superfici parametriche: curve e superfici di Bezier, Spline, B-spline, NURBS. Modelli geometrici 3D; wireframe, B-Rep e CSG. Sistemi Feature-Based (parametrici, variazionali). Metodo di lavoro indipendente da un sistema specifico Elementi di grafica computerizzata Hardware: generalità sui sistemi, periferiche grafiche di input ed output. Software: evoluzione del software grafico. Cenni sugli algoritmi di base per le trasformazioni geometriche: traslazione, rotazione e trasformazione di scala. Metodi e tecnologie per l'integrazione I problemi di integrazione CAD-CAE-CAM. I sistemi PDM, il Digital Mock-up. Il problema del data exchange: il trasferimento di dati tra sistemi CAD differenti. Complementi di disegno tecnico industriale I collegamenti albero-mozzo: chiavette, linguette e profili scanalati. Rappresentazione di cuscinetti, cinghie, pulegge e ruote dentate. Resistenza dei materiali Richiami sul calcolo delle tensioni equivalenti e ipotesi di rottura Richiami di resistenza a fatica dei materiali da costruzione, concentrazione delle tensioni dovute agli intagli, danneggiamento ed accumulo del danneggiamento Cenni sul comportamento dei materiali da costruzione sotto l¿azione di campi di temperatura, il creep teoria di Hertz per il calcolo delle tensioni di contatto, resistenza dei materiali ai carichi di contatto e problemi di usura Collegamenti meccanici collegamenti filettati, coppia di serraggio, dimensionamento statico ed a fatica collegamenti forzati albero-mozzo collegamenti con chiavette, linguette e profili scanalati collegamenti saldati ¿ saldature continue e saldature a punti giunzioni con adesivi. Organi delle macchine e loro dimensionamento cuscinetti a rotolamento: scelta a catalogo, previsione della durata, montaggio giunti rigidi, articolati, cardanici ed omocinetici barre di torsione, molle ad elica cilindrica, molle a balestra, molle a disco conico innesti a frizione ruote dentate cilindriche a denti diritti, profilo ad evolvente, geometria modulare, segmento dei contatti, rapporto di ingranamento, strisciamento dei fianchi dei denti, resistenza a flessione e a contatto, geometria risultante dal taglio con profili spostati

Complements of technical industrial drawing: application of functional and technological dimension specification system to product parts. Computer Aided Design and Manufacturing (CAD-CAM) - General information on CAD systems. - Hardware: overview of systems, peripherals, graphical input systems. - Software: interactive graphical packages, two-dimensional and three-dimensional systems. - Physical parts, models and representations. - The CAD-CAM process. The problems of integrating CAD-CAM-CAE. Elements of Computer Graphics - Notes on basic algorithms for geometric transformations: translation, rotation and scale. The geometric modeling - 2D and 3D models, wireframe, B-Rep and CSG. - Parametric curves and surfaces: Bezier curves and surfaces, spline, B-spline, NURBS; - Modeling system from geometry based to knowledge based: feature-based systems. Methods and technologies for the integration - The process of project development. PDM systems, Digital Mock-up. The problem of data exchange: the transfer of data between different CAD systems, the IGES and STEP standards.Strength of materials - Recall of the calculation of equivalent stress and possible failure modes - Basics of fatigue strength of materials; factors influencing the fatigue life, fatigue characteristic data and standard diagrams; stress concentration due to notches; load time histories, damage and damage accumulation. - Hertz theory for the calculation of the contact pressure, strength of materials to contact loads and wear problems Mechanical joints - Threaded joints, axial load and tightening torque, static and fatigue design Machine elements and their design - Roller bearings: choice in the catalog, life estimation, assembly and site preparation - Torsion bars, cylindrical helical springs, leaf springs, conical disc springs - Notes on friction clutches and transmission joints: articulated, universal and homokinetic joints - Cylindrical spur gears, tooth involute profile, modular geometry, length of the path of contact, contact ratio, transmission ratio, specific sliding coefficients, gear tooth bending and surface fatigue failure.

Additional information

Course structure

Students will develop in the classroom exercises on the topics covered during lectures. Solid modeling of mechanical components using feature-based CAD systems. Assembly of components. Documentation of components and assemblies using two-dimensional drawing. Students will also be asked to develop small projects related to motor vehicle parts, so to apply in a comprehensive/integrated way some of the methods for design and verification. Students will develop applications of CAD drawing taking advantage of the PLM and TC packages specifically installed in the computer Labs of Mirafiori site.

Reading materials

Slides and notes will be made available to students Textbooks: - Foley, van Dam, Feiner, Hughes - Computer Graphics: Principles and Practice, Addison-Wesley - 1997 - Jami J. Shah, Martti Mäntylä - Parametric and Feature-Based CAD / CAM - John Wiley & Sons - 1995 - Michael E. Mortenson - Geometric Modeling - Second Edition - John Wiley & Sons, 1997 - E. Chirone, S. Tornincasa - Disegno tecnico industriale, vol. I e II - Il capitello, Torino, 2010 - A.R. Juvinall, K.M. Marshek - "Fundamentals of machine component design", Wiley - M. Rossetto - "Introduzione alla fatica", ed. Levrotto & Bella, Torino - J. Bannantine – “Fundamentals of metal fatigue analysis”, Prentice Hall 1990 Further reference books - R. Giovannozzi - "Costruzione di Macchine", ed. Patron, Bologna - J.A. Collins - "Failure of materials in mechanical design", ed. Wiley, New York - Wahl - "Mechanical springs"

Assessment and grading criteria

The final exam is devoted to evaluate the knowledge acquired both in Machine design and in Drawings For what concerns Drawing the exam consists in a practical test in the CAD laboratory, that includes the evaluation of exercises carried out during the course, and in a written test. To pass this part of the exam, students must obtain “pass” both in the practical test and in the written test.. For what concerns Machine design, the exam consists in a written part and an oral part. The written part generally consists in the solution of a couple of design and verification problems. During the tutorials, students will develop the solution of problems similar to those they will be asked to solve during the written exam. The oral part of the exam is devoted to verify the level of knowledge of the Machine Design topics that have been taught during the lectures. The ability of the student to explain from the theoretical point of view the asked questions, making use of formulas and diagrams, is of particular importance. It is also of relevance the ability of the student to explain technical constructive solutions by means of pencil sketches. To pass the written test students have to obtain a evaluation equal or larger than 18/30 for each of the problems that the written test is made of. In order to take the oral exam, the candidate must have passed the written test. The written and oral parts of Machine Design have to be passed in the same exam session.

In addition to the message sent by the online system, students with disabilities or Specific Learning Disorders (SLD) are invited to directly inform the professor in charge of the course about the special arrangements for the exam that have been agreed with the Special Needs Unit. The professor has to be informed at least one week before the beginning of the examination session in order to provide students with the most suitable arrangements for each specific type of exam.