Estudo das condições de corte no torneamento do aço AISI M4 endurecido, utilizando a metodologia de projeto de experimentos

Abstract

The current scenario; as a result of the global crisis; has caused huge changes in the metalworking industry. It is known that the global market movements caused change in a competitive environment by developing new methods; procedures and materials for making components for more efficient and lower cost. In particular; market segments where there is an apparent conflict between the production of commodities and products of high technology where the request for cost reduction and investment in technology is even greater and necessary for business survival. The production of dies for cold forming of packaging is an example of this global trend. The demand for efficient products have been increasing in the segment the hard turning process; replacing the conventional grinding process of finishing materials where high complexity profile is needed. The hard turning is a response to external crisis scenario; to cut costs and remain competitive in an increasingly demanding market. Thus; the proper choice of cutting tools and machining parameters is essential for the success. This work is a study of the machining conditions of CBN tools in AISI M4 hardened to 64 HRC; which is applied to dies in the packaging sector; applying the methodology of Design of Experiments (DOE). The DOE makes more efficient evaluation of the results of experiments and its methodology can be replicated for different variables facilitating the comparison of this work. We analyzed the surface finish of the piece as the main output and adopted a roughness Ra > 0.2μm as a criterion for end of life of the cutting tool. All parameters contributing to the cutting surface roughness and roundness; while the variation of feed rate showed significant influence on the finished part.