Modelagem da rugosidade de insertos de metal duro com base na topografia do rebolo
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Data
2023-02-13Autor
Costa, Hugo Emanoel de Andrade
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After sintering, cemented tungsten carbide cutting inserts are ground so that the final
dimensions can be obtained and surface defects can be reduced. To quantify the
insert surface quality after the finishing process, different roughness parameters are
measured, which depend on the process conditions and, mainly, on the grinding
wheel topography. In order to reduce carrying out experiments to determine the
conditions that lead to optimal roughness values, which involves consumption of time
and resources, several analytical and numerical models have been applied. In this
research, however, it is proposed the use of a graphic model, elaborated through
CAD software, based not only on the kinematics of the process, but also on the
characteristics of the grinding wheel topography and of the workpiece, such as
geometry and spatial distribution of the abrasive grits. As obtained through the
graphic models, the Rayleigh distribution used to position the grit about to its
protrusion, grinding wheels with smaller grain protrusion and inserts with lower initial
roughness led to lower values of final roughness. For the surfaces simulated with the
real grinding wheel topography, in general, it was observed that higher grain
protrusion or number of active cutting edges caused an increase in roughness, as
the surface was significantly modified.
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