Akademik Veri Yönetim Sistemi
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY, cilt.41, ss.490-500, 2023 (SCI-Expanded)
Cemented carbide is mostly used in the mold and tool industry due to their high hardness, temperature and
wear resistance, and it is very difficult to shape with conventional machining methods. Because, during the
machining of certain geometry from these materials, microcracks on surface and flaking at the machined
edges due to their brittleness as well as rapid tool wear mostly due to their high hardness occur. In this case,
EDM is considered one of the most suitable machining technologies for brittle material such as carbides, as
it provides a non-contact shaping with electrical sparks between the tool and the workpiece. This study
focused on the simultaneous optimization of the most important performance indicators namely material
removal rate, tool wear rate and surface roughness in creating a keyway on WC-15Co material with the diesinking EDM. As a result of experiments using copper electrode, the impacts on performance indicators of
discharge current, pulse time and pulse interval were investigated with 3D surface topography images. It
was determined that the peaks and craters formed on the machined surface expanded with the increase of
pulse time, and the decreased with the increase in the pulse interval. As a result of the Taguchi-grey relational analysis (TGRA) application, discharge current of 6 A, pulse time of 25 µs and pulse interval of 100
µs were found as optimum parameters. ANOVA results showed that Ip, Ton and Toff affected GRG values by
44.23%, 28.77% and 5.87%, respectively. A 23.95% improvement in performance indicators was achieved
thanks to the TGRA multiresponse optimization.