SURFACE ROUGHNESS OF HEAT TREATED Eucalyptus grandis WOOD

Gilmara Pires de Moura Palermo, João Vicente de Figueiredo Latorraca, Luiz Fernando de Moura, Adriana Maria Nolasco, Alexandre Monteiro de Carvalho, Rosilei Aparecida Garcia

Abstract


This study aimed to evaluate surface roughness of heat treated Eucalyptus grandis wood afterperipheral planning and sanding performed in directions to the grain and against the grain. For machiningtests, workpieces were collected from two different regions in the radial direction, as follows: internal,nearby the pit; external, nearby the bark. Heat treatment was carried out by heating samples at a maximumtemperature of 190ºC, with total treatment duration of 390 minutes. Heat treated and control samplesunderwent peripheral planning and sanding tests. The quality of machined surfaces was assessed bymeans of roughness average (Ra) measurements across and along the grain orientation. Results indicatedsignificant differences in surface roughness as a function of machining feed direction, sandpaper gritsize, and heat treatment. Surface roughness has not shown any difference in the radial direction.

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