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EM 609 -
Computer Numerical Control (Comando Numérico Computorizado)
Introduction to CNC: fundamentals of Numerical Control; CNC technology as a building block of FMS; CNC technology vs mass production systems; trends. Industrial applications of CNC technology: machining; turning; grinding; EDM; sheet metal working; inspection; handling; assembling. Architecture of CNC: CNC structure; building blocks; functional blocks; interface level; processing level; process control level; axis control; examples. Types of control: point to point control; contouring control; adaptive control; examples and applications. Generation of tool trajectory: reference systems; axis nomenclature; resolution; systematic error; compensation of systematic error; variable errors; compensation of variable errors; trajectory tolerance. Design of CNC machines and manufacturing systems: typical architectures; movements; rotating and linear axis; automatic tool change systems; automatic part load/unload systems; tool monitoring systems; tool dimension measuring systems; tool wear measuring; tool breakage detection. NC programming: structure of NC language; ISO codes; tool dimension compensation; tool wear compensation; computer-aided NC programming; generation of NC programs through CAD/CAM systems; trends; examples of NC programming. Integration of CNC with other systems: information exchange level integration; control level integration. CNC equipment selection: criteria for assessing and comparing CNC machines. |