Aplicação do shunt piezoelétrico para controle passivo de chatter no processo de torneamento da liga Ti-6Al-4V ELI

Abstract

One of the main limitations for increasing the productivity of machining processes is the emergence of self-excited vibrations. This type of phenomenon, commonly called chatter, arises due to the interaction of the cutting tool with the wavy surface of the part to be machined. One of the strategies to mitigate these effects lies in the use of passive vibration control using a shunt piezoelectric device, which consists of an electrical circuit connected to piezoelectric material coupled to the structure in order to dissipate vibrations. This master’s research proposes the study of these device for chatter control in the turning process of titanium alloys and to analyze their performance when the cutting parameters are varied. The results showed that the cutting speed is more influential on the roughness of the parts, the feed and the machining depth are more influential on the vibration. With the simulations performed, it was possible to show that the shunt device is efficient to reduce vibrations and increase the stability limit of the process, thus mitigating the chatter during the machining process.