EM - Escola de Minas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6
Notícias
A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.
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2 resultados
Resultados da Pesquisa
Item Suppressing notch wear by changing the tool path in the side milling of a Ti‑6Al‑4 V alloy.(2022) Inácio, Ricardo Henrique; Silva, Rodrigo Henriques Lopes da; Pereira, Igor Cézar; Hassui, AmauriDespite many advantages ofered by titanium alloys compared to other conventional materials in the industry, several manufacturing challenges arise, and they are associated with titanium’s mechanical, thermal, and chemical properties. As a result of these characteristics, titanium alloys are low-machinability materials. Machining path strategies have proven their infuence over surface fnishing, machining forces, and tool life to reduce machinability-related problems. Most studies have shown the impact of the path strategies on frontal or end milling processes, and few are related to side (tangential) milling. Finally, based on the self-propelled rotary tool (SPRT) technique, which alters the cutting tool portion during machining, this work evaluates surface fnishing behavior, machining forces, and tool life using two diferent tool path strategies (sinusoidal and linear) on the side milling of Ti-6Al-4 V alloy. The results show that the association between an adequate tool path strategy (sinusoidal) and the cutting parameters improves surface fnishing (more than 130%), decreases cutting forces (about 20%), changes tool wear mechanisms, and increases tool life signifcantly (4–5 times) without productivity loss. Wear mechanisms that promote notch wear were suppressed, and uniform fank wear predominated. Consequently, the sinusoidal path has brought benefts to the cutting process. It is a technology that can have great interest and is easily applicable in the industry.Item Análise da temperatura filete a filete no rosqueamento interno por machos de corte.(2018) Souza, R. F. A.; Vianello, Pedro Ivo Alves; Silva, Marcio Bacci da; Pereira, Igor CézarAmong the manufacturing processes, threading stands out, as it can be accomplished by machining or by forming. This process is responsible for the creation of internal and external threads, which has great applicability in production lines. Due to the market’s great competitiveness, methods are sought to increase production by decreasing the time of each unit process. However, tapping is usually performed at low cutting speeds due to limitations related to the manufacturing process. The study of the tapping can bring benefits, such as the reduction of wear mechanisms, resulting in an increase in tool life. In this research, the temperature was measured from fillet to fillet in the conical part of the tool, varying the cutting speed and the number of fillets. The tap used is, M 10 x 1.5 HSS, uncoated in threading process for internal thread production in SAE 1045. To analyze the temperature was used the tool-workpiece thermocouple method on each fillet of the tap. The cutting speeds used were 10 and 25m / min. From the second fillet on the temperature is constant, even with the increase in the number of fillets, as expected.