UniGe.it

Stai usando un browser obsoleto. Per una migliore esperienza di navigazione aggiorna il tuo browser

DESIGN OF MACHINE ELEMENTS

CODE	84337
ACADEMIC YEAR	2022/2023
CREDITS	5 cfu during the 3nd year of 8784 INGEGNERIA MECCANICA (L-9) - LA SPEZIA
SCIENTIFIC DISCIPLINARY SECTOR	ING-IND/15
LANGUAGE	Italian
TEACHING LOCATION	LA SPEZIA
SEMESTER	2° Semester
MODULES	This unit is a module of: MACHINE DESIGN
TEACHING MATERIALS	AULAWEB

OVERVIEW

The course aims to introduce students to product design.

AIMS AND CONTENT

LEARNING OUTCOMES

The course aims to introduce students to product design, with particular reference to the design process and to design for safety, for manufacturability, for cost, for assembly and for environment.

AIMS AND LEARNING OUTCOMES

The purpose of the course is to introduce the student to Machine Design which is a universal visual language that conveys the way something works or how it is built.

Attendance to lectures and individual study will allow the student to:

learn the general aspects of the design sector
acquire the technical terminology used in the design
master the methodologies of representation of real objects through orthogonal projections and with the use of sections according to the European ISO method
correctly indicate the dimensions, dimensional tolerances and geometric and microgeometric tolerances
knowing how to express couplings between pieces with play or interference in the base shaft or base hole system, identifying the correct position and tolerance class
carry out the schematization of simple machine parts
suggest the optimal form according to the rules of the DFA and DFM
outline the methods of assembly and disassembly of the elements with the choice of the proper coupling

Icona di Verificata con community

TEACHING METHODS

The lessons introduce the UNI ISO standards necessary for the representation of objects in a unambiguous way. They also present the terminology and the basic rules for industrial technical drawing with the appropriate symbology to indicate threads, gears, bearings, etc. Particular attention is given to the methods of assembly/disassembly of the components in order to facilitate their assembly (DFA) but also to make easy their inspection and maintenance. The operation of the studied machine elements is also illustrated by means of videos and their shape and the material thay are made of are justified according to the DFM guidelines but also to the assembly methods (manual, robotic, automatic) to the eco- compatibility guide lines and those related to the aspects of workers' safety and health.

SYLLABUS/CONTENT

Design of mechanical elements

Connections that cannot be dismantled: Welds. Riveted joints. Glued on joints. Forced connections.

Connections that can be dismantled: Threads. Power screws. Threaded connections. Set screws (outlines).

Mechanical springs.

Elements for transmission of power and lifting: Gears. Flexible elements: Belts; Wire ropes; Chains.

Members for storage or transfer of energy associated to rotating motion.

Brakes. Clutches. Flywheels.

Bearings: Rolling contact bearings. Journal bearings.

Crankshafts.

Elements of product design

New approach European Directives (outline).

Standards for the safety of machinery: Machinery Directive and Italian D. Lgs. 81/2008.

Total Design. Product design specification.

Cooperative and Eco-compliant Design.

Design for “X” (specifically: Design for manufacturing and for assembly/disassembly).

TEACHERS AND EXAM BOARD

ROBERTO RAZZOLI

Office hours: The teacher is available for the students at the end of each lesson or via a MS Teams meeting.

Exam Board

MARGHERITA MONTI (President)

GIOVANNI BERSELLI

FRANCESCO CRENNA

ROBERTO RAZZOLI (President Substitute)

LESSONS

LESSONS START

https://corsi.unige.it/8784/p/studenti-orario

Class schedule

All class schedules are posted on the EasyAcademy portal.

EXAMS

EXAM DESCRIPTION

The exam includes a written test and an oral test.

The written test consists of an exercise to be solved within 2 hours. During the test, only the use of the calculator is allowed. Smartphones have to be switched off.

Those who obtain a score of at least 18/30 for the written test can access the oral exam. Those who do not pass the written test have to repeat it in any official scheduled date.

The oral exam, which can be held within a calendar year after passing the written test, includes two questions: one on the topics of Machine Design and one for those of Machine Drafting. A failed oral exam does not invalidate the written test which can be reused in the future (within one year).

The final mark is given by the average of the marks of the oral and written tests: if it is a decimal, it is rounded to the upper unit.

ASSESSMENT METHODS

The written test assesses the student's ability to:

schematize a device by converting its elements to types that can be solved with algorithms (beams, plates, etc.)
apply the appropriate constraints between the various elements and between them and the frame
schematize the loads acting on the structure
draw the characteristics of stress in specific sections
identify the most stressed areas
dimension the critical areas by choosing the right material
unambiguously present the product, according to the European projections method

The oral exam focuses on the topics faced during the lectures and aims to assess to which extent the student:

has assimilated an adequate level of knowledge about the legislation
has acquired the ability to logically face problems that will be posed during the test
can illustrate theories and solve problems
expresses his thinking clearly
uses appropriate terminology
uses a methodological approach oriented to manufacturing feasibility
interprets and formulates principles related to the description of parts in a univocal, unambiguous and non-redundant manner

Exam schedule

Date	Time	Location	Type
12/01/2023	09:30	LA SPEZIA	Scritto
15/02/2023	09:30	LA SPEZIA	Scritto
06/06/2023	09:30	LA SPEZIA	Scritto
27/06/2023	09:30	LA SPEZIA	Scritto
18/07/2023	09:30	LA SPEZIA	Scritto
07/09/2023	09:30	LA SPEZIA	Scritto