Influência da vazão e pressão do fluído lubrirrefrigerante na afiação de brocas de aço-rápido M2

Abstract

This work presents a study on the influence of the pressure and flow intensity of the lubricatingfluid on the external cylindrical grinding process. For the analysis results, the machining conditions were maintained constant, varying the values of pressure and flow of the cutting fluid. The tests were conducted in two phases: first with a conventional aluminum oxide grinding wheel, grinding as specimen SAE M2 steel drills, with an average hardness from 62 to 65 HRc (Rockwell hardness). The obtained results show that there were no microstructural alterations on the sub-surface, analyzed through optical microscopy. As the increased values of the pressure and flow fluid rate showed that the darkened marks of superficially affected region decreased when the flow rate is at 60 liters per minute. For the drilling experiments of the second stage the end of life criteria used was the amount of machined material. Abrasion was the main mechanism of wear as chipping being the most significant type of wear. The axial forces on the surveys, after data analysis through Fisher method, it was shown there were no differences among the five circumstances of the application of the fluid regarding the feed force.