1 results listed
Carbon fiber reinforced plastics (CFRP) attract many industries especially aerospace, aviation, and automotive
thanks to excellent properties of these materials such as high strength to weight ratio, high creep, fatigue strength,
high corrosion resistant and also attractive appearance. However, due to their inhomogeneous structure, it is a very
hard job to machine them when compared homogenous materials. Drilling is the most used machining operation
in industry for assembly. When CFRP drilled, several problems may emerge. These problems may cause rejection
of machined part by reducing machining quality. Among these defects, delamination is the most dangerous one
since it reduces load carrying capacity and service life of composite component. It was reported that components
were rejected owing to drilling induced delamination in aerospace industry [1-3]. Therefore, machining of CFRP
with minimal damage is of great importance. Cryogenic machining is one of the methods in enhancing
machinability. In this study, drilling of CFRP using different diameter drills, cutting speeds, and feed rates in dry
and cryogenic environment experimentally investigated. Liquid nitrogen (LN2) at -196 °C was used as cryogenic
coolant. All drilling tests have performed on Quaser MV 154C machining center and a fixture was designed and
manufactured in order to machine the workpiece in cryogenic media (Fig 1.). Liquid nitrogen was poured onto the
workpiece and constantly supplied during experiments. Any coolant was not used in dry machining.
International Symposium on Light Alloys and Composite Materials
UHAKS
Gültekin Basmacı
Ahmed Said Yörük
Sezer Morkavuk
Uğur Köklü