Ing Ind - Inf (Mag.)(ord. 270) - LC (485) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA
051585 - COMPUTER-AIDED DESIGN AND MECHANICAL PROTOTYPING
The aim of the Course is to apply modern computer-aided methods focused on the dimensioning and construction of mechanical components and engineering systems according to functional requirements. The design and assessment of machine parts and engineering systems are based on parametric modelling, parametric assembly and ISO/ANSI Drawings. The application of Mechanical prototyping technology lays in solid and functional prototyping. Prototypes are made by using CAM, CNC and Rapid Prototyping techniques using several materials, e.g. plastics, mainly ABS, PVC or special resins, metals or other materials that simulate one or more mechanical or technological functionalities of the final component. The course also considers lectures in: Virtual and Augmented Reality (using the Oculus Rift and HoloLens devices), Reverse Engineering, and Additive Manufacturing.
Risultati di apprendimento attesi
Lectures and laboratory activities will allow students to:
1.Identify and define the parametric modelling strategies required to design mechanical components.
2.Know the parametric design modules of CAD systems in order to understand the design transmission systems components.
3.Analyse and understand the different strategies for the tool path creation and postprocessing for Milling and laser cutting systems.
4.Be able to build up a functional prototype using the different devices which are presented in the laboratory: CNC milling, 3D printer devices and Laser cutting systems.
5.Applying knowledge for the design of virtual and augmented reality scenarios of the digital mock-up in which the student will be involved by using the Oculus Rift and HoloLens devices.
6.Use the 3D scanner device for reverse engineering applications.
The main arguments for the Computer-Aided Design module are related to:
Design and calculate pre-tensed bolted connections and performs a strength check.
Calculate, design and check clevis pin joints.
Design and calculate shafts of various shapes. The shaft contains sections (cylinder, cone and polygon) and features (chamfers, fillets, neck-downs and other).
Design and calculate Spur Gears with straight and helical teeth. Designs are based on various parameters, such as number of teeth or center distance in order to perform the calculation of power, speed or torque.
Design and calculate Worm Gears with common or spiral teeth. Calculate the main production and check dimensions, strength check based on the CSN and ANSI standards.
Design and geometric calculation of Bevel Gears with straight and helical teeth including a correction for equalizing relative sliding.
Design and calculate Roller and Ball Bearings using two calculation methods.
Design and calculate V-Belt Drives. The drive can consist of any number of grooved pulleys and flat idlers. Engineering analysis finds appropriate belt tension with respect to desired load and specific friction.
Design and calculate Synchronous Belt Drives. This type of drive uses single or double sided toothed belts with trapezoidal profiles. The drive can consist of any number of pulleys or idlers.
Design and calculates Chain Drives. This type of drive can consist of any number of sprockets and flat idlers.
Design and technical drawings of Key Joints and performs their strength check.
Design and calculate Disc Cams, Linear Cams and Cylindrical Cams of a follower of translating or swinging arm type. The design is based on the cam properties of maximum lift, acceleration, velocity or pressure angle.
Design a Compression Spring. The wire diameter, number of coils, and spring free length are designed for a specific load, assembly dimensions or for the spring diameter and material.
Design and calculate Plain Extension Springs with a correction for additional bending.
Design and strength calculation of Belleville Springs. These springs are used in singles or in sets for carrying great loads while having a small deflection.
Design and calculate Helical Torsion Springs manufactured from a cold-formed wire or rod with a circular cross-section.
The main arguments for the Mechanical Prototyping are (CAM & Rapid Prototyping):
Introduction to CAM (Computer Aided Manufacturing).
Industrial Applications of CNC Machine and introduction to various kinds of CNC machines (drilling, lathe, milling, laser cutting, etc.)
The course also includes activities performed in the laboratory that will be carried out individually or in groups, using state-of-the-art technologies for CAD-CAE-CAM and Additive Manufacturing.
To have basic knowledge about CAD, CAE and CAM systems and in some ISO and ANSI standards for Drawing.
Modalità di valutazione
Course structure and examinations
Course attendance is warmly suggested. Students’ skills and knowledge will be evaluated by an oral exam (50% of the final mark) and by a team-project in which 4 students will be involved (50 % of the final mark), the latter chosen on a voluntary basis.
In the oral exam, the student is expected to:
a) discuss and present modern computer-aided methods focused on the dimensioning and construction of mechanical components and engineering systems according to functional requirements.
b) discuss and present the different design and prototyping methodologies on a quality level
By the team project, soft skills in oral presentation and work group are enhanced and improved. Each team will deliver a physical and functional prototype by using CAM, CNC and Rapid Prototyping techniques.