Caracterização da integridade de superfícies usinadas para produção de moldes e matrizes

Abstract

This work includes the conventional way of die and mold production. Process such as milling, EDM and sanding are discussed. These three processes of die and mold making were applied to the AISI H13 material, that is wide used by die and mold makers to produce the mold s parts. Besides that, some conditions were modified such as the cutting fluids applications. The surface integrity was observed in the machined material by the follow itens: the roughness, the hardness, the plastic deformations existence, chippings, residual tensile, among others features were observed. In the milling process the plastic deformations varied from 5 μm to 8 μm and a white layer with about 20 μm were found to the EDM process. In the sanding process were found risks mark s and micro-breaches. The average value measured for the hardness profile shows that in the boundary there is a low value than in the material base. The Barkhausen noise results show that the machining process employed had changed the sub-surface of the blank material. This changed can be seen analyzing the stress results measured by X ray diffraction.