Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
Ultraprecision machining of nanocomposite
Submission Author:
Renato Goulart Jasinevicius , SP , Brazil
Co-Authors:
Marcel Henrique Militão Dib, Dhiego de Godoi Dias
Presenter: Renato Goulart Jasinevicius
doi://10.26678/ABCM.COBEF2017.COF2017-0072
Abstract
The machinability of an nanocomposite is studied using monocrystalline diamond tools with different rake angles (neutral and highly negative). Micro-turning experiments were carried out under different cutting conditions. The workpiece material is an epoxy polymer (RTM6) samples impregnated with different concentrations of multiwalled carbon nanotubes and amphiphilic molecule (C16H33NH2 used as dispersant agent.) concentration. The quality of the surface finish generated was carried out by evaluating surface damage induced by tool material interaction and surface roughness using an optical profilometry. SEM was used to assess the chips removed in order to investigate whether the material removal mechanism changed using different concentrations of multiwalled carbon nanotubes HAD (Hexadecyclamine (Sigma-Aldrich)). Cutting forces and surface finish are used as the machinability measures to compare the composites response to cutting conditions. The results revealed that feedmarks may or may not be evident onto the surface depending on the cutting condition, carbon nanotubes concentration and tool geometry. The results showed that the amount (%wt) of CNT in the sample improves the surface finish. There was a slight influence of the depth of cut upon the roughness of the sample. It was observed that under submicrometer values the surface responded to machining presenting smaller roughness values. Optical profilometry results showed that the amount of CNT in the sample was responsible for improving the material removal mechanism. Presence of microcracks within the cutting grooves: always perpendicular to the cutting direction was detected in the sample with HAD and CNT . The opposite trend is probed s when cut with submicrometer depth of cut and no %wt HAD.
Keywords
nanocomposite, diamond turning, ultraprecision, surface integrity, machinability, nanocomposite, diamond turning, ultraprecision, surface integrity, machinability
