|SCIENTIFIC DISCIPLINARY SECTOR||ING-IND/15|
In industry and in particular in the field of mechanical engineering, technical drawing is the language that engineers use in order to define, detail and communicate their design and manufacturing choices. In accordance with its rules, defined by standardized conventions and methods of graphic representation, technical drawings contain manufacturing and testing information of machines and related mechanical components.
Basic elements of technical communication languages in the field of mechanical engineering. Techniques for representation of the morphology and definition of design and operational characteristics of mechanical components. Development of appropriate operational capabilities in the field of mechanical design.
The course aims to provide students with the basics of technical communication languages in the mechanical industry.
At the end of the course, the student will be able to: interpret assembly and component drawings relevant to machines and their components, respectively; understand details (for example tolerances, roughness, cartouche) contained in the above-cited drawings; apply the theoretical concepts to the solution of simple design or verification problems (for example the calculation of couplings). Finally, make technical drawings of simple mechanical components and machines in orthographic representation (using orthogonal projections) preferably by means of CAD tools.
Basic knowledge of how a computer works and of Windows® operating system.
The course includes: theoretical lectures - object lessons, held in the informatics hall, about the key features of the software Bentley Microstation - exercises carried out by the students tutored by the teacher, taking advantage of Microstation, regarding simple drawings and design problems.
The attendance is advisable. Theoretical lessons include a final self-assessment test. Group works are encouraged especially for exercises about assembly drawings.
Standardization of technical drawings. Classification of the drawings. General standards: formats and sizing, title block, lines, scale. Representation methods: classification of projections. Introduction to perspectives. Orthogonal and oblique projections. Orthographic projections. Use of orthographic projections: layout and choice of views. Sections: rules, types. Dimensioning: standards, systems, dimensions of geometric elements, functional and technological dimensioning. Dimensional errors: ISO system of tolerances, types and calculation of couplings, general tolerances, tolerance of chained dimensions. Microgeometric errors: definition, measurement, symbols and choice of the roughness. Macrogeometrical errors: geometric tolerancing in outline.
Threads: elements of a thread, types, representation and dimensioning.
Threaded connections elements: bolts (nuts and screws), studs, inserts, unscrewing devices. Removable non-threaded connections elements: keys, mention of plugs, safety rings and stops, splined coupling joints. Outline of permanent connections. Materials for mechanical engineering: designation and notes on mechanical properties, types of materials and heat treatments.
A collection of the slides shown during the lessons is available.
E. Chirone, S. Tornincasa, “Disegno tecnico industriale”, vol. 1 e 2, Ed. Il Capitello, Torino, 2006.
L. Baldassini, "Vademecum per disegnatori e tecnici", Ed. Hoepli, Milano, 2002.
Office hours: Thursday afternoon in the classroom from the end of the theoretical lesson to 3:00 p.m.
FABRIZIO STEFANI (President)
ROBERTO RAZZOLI (President Substitute)
The written exam consists of a Multiple Choice Question theory test. The Multiple Choice Question theory test includes questions about 10 topics of the course. A maximum of 3 questions for each topic must be answered, for a total of roughly 20 questions.
Oral exam deals with the discussion about a drawing exercise and specific questions of the test, inclusive of the relevant theoretical topics. The drawing exercise must be preferably carried out by means of a CAD software and completed with all of the information (quote, tolerances, roughness, ...) needed to ensure compliance with the requirements prescribed in the text of the exercise.
The written exam will evaluate the comprehension of all the main theoretical topics of the course, necessary to read and interpret drawings of mechanical components and related details, by means of the multiple choice test. Each question of the test does not require the theoretical study of the theory, but its application for solving the proposed problem. In addition to further verifying the comprehension of the theoretical topics, the oral examination will evaluate the operational skills required for the completion of the exercise theme, i.e. the use of representation and detailing methods in an assembly or component drawing related to a simple mechanical part.
Assessment of students’ learning is based on: the ability to apply drawing standards and rules; critical thinking skills applied to the exercises assigned during the course; the ability to expose the topics covered with appropriate technical terminology.