Akademik Veri Yönetim Sistemi
IMMC2021-International Metallurgy and Materials Congress, 10 - 12 Haziran 2021, ss.590-593, (Tam Metin Bildiri)
Heat treatment is a link between the forging process and
machining process, and heat treatment can regulate and
control the mechanical properties and machinability of the
workpiece through the change of microstructure. In
industry, quality, efficiency and cost are the most
important components in the manufacturing process. The
accurate way to come up with these components depends
on the selection of the accurate and suitable production
conditions. In this context, AISI 4140 (42CrMo4) steel is
one of the most widely used materials in the industry and
is used in automotive, aircraft and space fields. Therefore,
it is very important to process this steel material effectively
and efficiently. AISI 4140 steel in experiments was chosen
as reference material due to its extensive applications in
many areas. In the present work, the effect of heat
treatment on machinability of hot forged AISI 4140 steel
in the drilling process was investigated at constant cutting
parameters using different drill types (uncoated and TiAlN
coated HSS twist drills). For this purpose; the surface
roughness, dimensional accuracy, and circular and
cylindrical deviations characterizing the hole quality were
investigated experimentally. As a result, coated drill
compared with uncoated drill gave positive results for each
evaluation criterion. A better drill quality was obtained for
the heat-treated samples than those of the unheat-treated
samples at all conditions.