MODELO ANALÍTICO PARA FORÇAS DE CORTE EM MICROCANAIS VIA MICROCORTE OBLÍQUO

Abstract

Micromilling is a process characterized by its reduced dimensions and should not be approached as a simple reduction of conventional milling, since the radius of the cutting edge of the micromill is greater than the minimum cutting thickness for the chip to be formed, causing the scale effect. The purpose of this work is to study the cutting forces involved in the micromilling process and how they vary depending on the cutting parameters adopted, presenting a comparison between an analytical model for cutting forces and experiments carried out by the main authors, cited in the elaboration of the model proposed, searching the smallest possible error. The Johnson-Cook formulation was adopted to find the shear stress value and accounts for the part material data, strain, strain rate, and temperature. The milling force coefficients were determined from the fundamental approach of oblique cutting and considers: the radius of the cutting edge, the shear stress, the main angles and the coefficient of friction. With this, a general formulation was adopted to describe the model of cutting forces for micromilling.