Özet:
In electro discharge machining used frequently
in tool production, copper and graphite is commonly used as
electrode material. The reason of this is high melting
temperatures and excellent electrical and thermal
conductivity of these materials. But, the low wear resistance
of these materials makes it necessary to investigate different
materials that have more wear resistance. Up to now, apart
from copper, materials like brass, chromium, tungsten,
steel, titanium have been used in electrode production.
Apart from different materials, different production
techniques have been investigated to increase production
time. Powder metallurgy is one of these techniques.
Electrode production with powder metallurgy becomes
more advantageous than other production techniques due to
the possibility of different powder combinations and
controlling of thermal, electrical, mechanical and micro
structure properties of produced electrodes with pressing
pressure and sintering temperature. In the present study,
chromium-copper composite electrodes produced with
powder metallurgy will be used for electro discharge
machining of SAE 1040 steel and material removal rate,
electrode wear rate and surface roughness values will be
compared with values from machining with electrolytic
copper.