95972 - LABORATORIO DI PROGETTAZIONE MECCANICA PER L'AUTOMAZIONE T

Learning outcomes

The course aims to provide the methodologies and tools to approach the design of functional components and auxiliary parts of mechatronic automation systems. At the end of the course, the student: can analyse and set up drawings of components for automatic machines and other mechatronic systems can analyse and set up projects and select components of automatic machines

Course contents

The course deals in parallel with the main concepts of mechanical drawing and the functionality of mechanical assemblies of interest in automation. Each lesson, held in the computer lab, opens with a theory part and is completed with CAD applications. The software used is CREO Parametric, an educational version of which the students can download onto their machines.

Working groups will be set up to study an assembly assigned by the lecturer and realise it on CAD by reverse engineering from known drawings.

The theoretical topics covered during the course will revolve around the following themes:

Elements of Mechanical Design

Introduction. Line types. Projection methods and views. Sections. Notable representation conventions

Dimensioning. Purposes and characteristics. Reference and measurement lines; arrows. Standards and examples. Dimension writing methods. Dimensioning systems. Choice of dimensioning system according to the type and purpose of the drawing.

Dimensional tolerances. Dimensional and geometric errors. Functional dimensions. Adjustment. Nominal dimension; limit dimensions (maximum and minimum); deviations (upper and lower). Dimensional tolerances. Shafts and holes. Backlash and interference. Tolerance indication.

Threads and threaded parts. Anti-unscrewing systems. Unified organs. Tabs and keys. Retaining/locking rings (Seeger), ferrules, washers. Splined couplings. Toothed wheels.

Surface roughness. Measurement and calculation. Representation on drawing. Relation to the type of machining. Recommended roughness and costs.

Mechanical Drives

Rolling bearings. Generalities. Assembly. Types. Load capacity and life of rolling bearings. Calculation of basic rating life: equivalent load; examples. Assembly examples. Selection of bearings. Conventional representation of rolling bearings in technical drawings

Couplings. Generalities on transmissions. Permanent connections between shafts. Misalignments and relative motions. Types of misalignment. Classification of couplings. Joint selection. Rigid couplings. Torsionally rigid deformable joints. Torsionally deformable joints. Movable joints.

Grafts. Description and classification. Form-coupled grafts. Friction clutches: characteristics. Flat clutches.

Brakes: generalities. Description and classification. Types of control. Mechanical brakes. Shoe brakes. Expansion brakes. Band brakes. Disc brakes. Brake selection and testing: useful design parameters.

For the CAD exercises, the main functions of the software in its solid modelling and assembly environments will be explained, with details on the functions listed below:

1. PTC Creo Parametric

1.1. Introduction to CAD

1.2. Generalities

1.3. File management

1.4. Work sessions and their management

1.5. Display (work area)

2. Parts Modelling

2.1 Sketch environment

2.2. Extrusion Feature

2.3. Revolution Feature

2.4. Chamfers and Fillets

2.5. Drilling Features

2.6. Cosmetic Threading

2.7. Series

2.8. Sections

2.9. Material Assignment

2.10. Managing the model tree

2.11. Sweep Feature

2.12. Shell Feature

2.13. Profile Ribbing and Trajectory Ribbing Feature

3. Creating Assemblies

3.1. Constraints on the creation of assemblies

3.2. Connections

Readings/Bibliography

The teaching material, provided by the lecturers and referring directly to the lectures given, can be found on the on-line teaching platform, in the part dedicated to the course (Home | Virtual (unibo.it) [https://virtuale.unibo.it/]).

Online tutorials on the use of the parametric solid modeller CREO are available in:

Creo tutorials (ptc.com) [https://support.ptc.com/help/creo/creo_pma/r10.0/italian/index.html#page/tutorials_pma/pma_tutorials.html].

Reference texts

- CHIRONE, TORNINCASA, "Disegno Tecnico Industriale", Vol. 1, 2, Ed. Capitello, Torino.

- MANFE', POZZA, SCARATO, "Disegno Meccanico", Vol. 1, 2, 3, Ed. Principato, Milano.

- BALDASSINI, “Manuale per Disegnatori Tecnici” o equivalenti.

Teaching methods

The Course, as described more in detail in the Programme/Contents section, provides both theoretical and applicative knowledge and consists mainly of interactive lectures and exercises to acquire the basics for the correct use of a CAD. Lessons take place in the School's computer labs.

Assessment methods

Individual oral examination.

The oral examination includes a presentation of the group work carried out in relation to a mechanical assembly. Each student will prepare his/her personal presentation and present it to the lecturer, citing:

- Functions and common use of the chosen assembly

- Parts of the chosen assembly

- 3D models of the chosen assembly

- 3D assembly of the chosen assembly

IMPORTANT NOTES

The student must register for the examination on Almaesami [https://almaesami.unibo.it/almaesami/welcome.htm].

Teaching tools

Slides and additional information can be found on the online teaching platform in the course section (Home | Virtual (unibo.it) [https://virtuale.unibo.it/]).

RECOMMENDED CAD SOFTWARE: CREO

- Additional support: On-line tutorials available to anyone who registers on the site: Creo tutorials (ptc.com)[https://support.ptc.com/help/creo/creo_pma/r10.0/italian/index.html#page/tutorials_pma/pma_tutorials.html].

The student will be able to install an educational version of the software on his or her own machine, by registering appropriately on the PTC site, as a student of ALMA MATER STUDIORUM - University of Bologna, according to the instructions provided by the lecturer.

Office hours

See the website of Daniela Francia