Otimização dos parâmetros de torneamento para melhoria da estabilidade do chatter baseada em diagramas de lóbulos

Abstract

Machining processes dominate the manufacturing industry, being vital for the delivery consumer goods with reliability and quality, but some self-excited phenomenon such as chatter are limiting in the delivery of these objectives. There are studies that define turning parameters to obtain stability and instabilities, one of the techniques employed is the lobe diagram method, which uses a dependence between the spindle rotation and the depth of cut limit to generate graphs that explain the vibration behavior of the system. Many authors have proposed different methodologies and tools seeking to minimize the occurrence of chatter, whether developing complex dynamic models and analyzing the effect of machining parameters, or testing tools with different materials in order to promote more stable vibration behavior. However, many previous solutions proved to be too complex to actually be used or even ineffective, thus lacking a more targeted approach. This study focuses on the development of a dynamic modeling of turning based on a carbide specimen, generating lobe diagrams that will serve as a basis for the use of an optimization strategy that is capable of identifying process stability, delivering an analysis of optimum performance ranges. The results obtained revealed the great interference of the feed in stability and the need for a sweep of all combinations, since there is no clear profile that allows defining consistent application ranges, even with the use of different tools, in addition, the The cost functions used did not prove to be sufficiently robust to contemplate all criteria relevant to the context of turning. In short, the study proved to be valid, practical and applicable to the context of minimizing chatter and maximizing productivity and quality.