Abrasive waterjet (AWJ) machining of representative aerospace materials, graphite/epoxy (Gr/Ep) laminate, 7065-T6 aluminum alloy, and Ti-6Al-4V titanium alloy materials was conducted. Design of experiments was used to account various parametric combinations of pressure, stand off distance, traverse rate, and abrasive grit size. Models for kerf taper and surface finish were formulated. Comparative analysis suggests that material removal in composite material exhibits minimal dependence on reinforcement or its orientation, hence facilitating the achievement of kerf uniformity and superior post-machined surface integrity. Micro-mechanisms of material removal in AWJ machining of ductile Ti and Al alloy materials are distinct, but remain constant with cutting depth despite characteristic changes in kerf wall features and kerf profile. Rough cutting zone (RCZ) or waviness or groovy patterns that are observed on the AWJ cut surface is the manifestation or degrading jet energy and instability regardless of the material.
Abrasive waterjet machining of aerospace materials
2001
15 Seiten, 14 Quellen
Conference paper
English
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