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EM 632- Metal Machining ( Corte de Metais por aranque de apara ) Machining by chip removal; movements and geometrical relationships. Cutting tool nomenclature and geometry. Machine tool selection criteria. Machining operations; turning, milling, drilling and grinding. CNC machine tools; technology and programming (brief reference). Cutting forces and cutting power; shear yield strength in cutting. Chip formation. Modeling of orthogonal cutting. Chip thickness ratio. Shear angle. Deformation and deformation rate. Ernest and Merchant, Lee and Shaffer’s and other models. Material stresses and solicitations on the tool. Energy balance. Three-dimensional cutting. Numerical simulation of metal cutting (brief reference). Tool materials: high speed steels, cemented carbides, ceramics and ultra-hard materials; hard coatings. Wear and tool life. Taylor's law. Relevant factors affecting tool wear. Cutting fluids. Abrasion metal machining. Surface finish. High speed machining (HSM): machining centres, cutting tools and machining strategies. Machining for mould manufacture. Objectives To study the scientific bases of metal cutting and it’s applications in production engineering problems. To get in-depth knowledge related to machining manufacture and to strengthen mastering of its terminology. To establish the methods and technological parameters, in view of achieving machined parts within the production drawing specifications. |