Influência da microgeometria do gume obtido por retificação sobre a vida útil da ferramenta e a qualidade superficial da peça para o processo de fresamento

Abstract

In machining, process productivity and reliability are precepts of industrial manufacturing. In the cutting process, edge micro geometry influences the wear behavior and tool life, as well as influences the quality of the machined surface. Today, technological developments in cutting tools are focused on four aspects: new materials, surface and coating, geometry optimization and cutting edge treatment. Thus, this work studied the effect of the grinding edge treatment process on hard carbide endmills on tool life and the surface quality machined for the milling process. Thus, the treatment of the edge by grinding was investigated and two micro-geometries were proposed, which were a sharp edge and a beveled edge, according to the theoretical basis of the tool manufacturer's process and know-how. Pre-grinding edge tests were performed to evaluate and define the most appropriate process parameters. After the pre-test results were evaluated, the size and angle of the chamfered edge that was applied to the tools was defined. Thus, the sharp and beveled tools were subjected to machining tests and the results obtained for both edge microgeometries were compared. Experimental tests evaluated tool life by measuring flank wear and surface quality by measuring roughness and assessing the texture of the machined surface at the beginning and end of tool life. Tools with the ground edge, in relation to the tool life, obtained inferior results compared to the tools with the sharp edge. For surface quality, the tools with the ground edge obtained the highest roughness values and the texture analysis did not reveal significant differences between the surfaces. It was identified that the wear mechanisms of the tools were abrasion and adhesion (sic).