Influência dos parâmetros de corte sobre as vibrações no torneamento interno com ferramenta de diâmetro duplo

Abstract

Machining tools with large swing lengths are by nature susceptible to the occurrence of chatter vibrations. The analysis of the influence of the addition of multiple edges acting simultaneously in the cut is still poorly explored in the academic environment, although the industrial application is strategic due to the higher material removal rates. Chatter vibrations may be responsible for the poor surface quality of the part and for reducing the tool lifetime. However, the selection of machining parameters that reduce this phenomenon is difficult, due to the dynamic interactions between the cutting tools, limiting its extensive use in the market. This work has as main objective the analysis of vibrations in the internal turning process of aluminum using a double cut tool holder. For this reason, machining forces data were collected through an acquisition system connected to a computer running the LabView software. It was found that the process efforts are greater for simultaneous machining. This work also intends to understand the influence of rotation and cut depth on the occurrence of regenerative vibrations through experimental tests with the capture of audio signals with the support of a microphone for the elaboration of the stability chart. It was verified that it is possible to obtain vibration-free machining conditions with high material removal rates for simultaneous turning. It was also showed that the rotation and depth of cut are parameters of high influence on the stability of the process. The results also showed that the simultaneous internal turning with two tools can work in favor of increasing the stability of the process, when compared with simple internal turning operations.