Análise da influência dos parâmetros de processo no fresamento de Inconel 718 sobre o desgaste e a qualidade superficial

Abstract

Nickel alloys have the ability to resist extreme conditions, as a result, they are in evidence among different industrial areas. Nickel alloys milling is often associated with high manufacturing costs and low productivity. Cutting tool micro geometry is one of the key factors in order to enable high performance cutting operations with these alloys. Besides that, the cutting fluid use can reduce friction and process temperature. On the other hand, dry machining brings environmental benefits and, in addition, it can protect the factory worker from several diseases caused by the contact with the cutting fluid. Due to this, experimental trials were realized, focusing on mechanisms and types of wear and tool life and on the workpiece surface integrity. The experiments occurred with the use of original tools and polished tools. Besides that, the milling process was evaluated in different conditions, dry milling and with the use of MQL. From the experiments, workpieces were produced, in the begging and in the end of tool life. Texture, roughness, affected layer and microhardness were analyzed when it comes to surface integrity. Related to the tools, the mechanisms and types of wear were studied. In addition, qualitative and dimensional investigations were performed. The results show that the different machining conditions and the tool edge preparation influence significantly in this milling process. Among the tested conditions, the best performance was achieved by the original tools with the use of MQL. [resumo fornecido pelo autor]