This study investigated the multi-response optimization of the turning process for an optimal parametric combination to yield
the minimum cutting forces and surface roughness with the maximum material-removal rate (MRR) using a combination of a
Grey relational analysis (GRA) and the Taguchi method. Nine experimental runs based on an orthogonal array of the Taguchi
method were performed to derive objective functions to be optimized within the experimental domain. The objective functions
were selected in relation to the parameters of the cutting process: cutting force, surface roughness and MRR. The Taguchi
approach was followed by the Grey relational analysis to solve the multi-response optimization problem. The significance of the
factors on the overall quality characteristics of the cutting process was also evaluated quantitatively using the
analysis-of-variance method (ANOVA). Optimal results were verified through additional experiments. This shows that a proper
selection of the cutting parameters produces a high material-removal rate with a better surface roughness and a lower cutting
force.

Raziskani so odgovori optimizacije procesa stru`enja z optimalno kombinacijo parametrov s ciljem dose~i minimalne sile
rezanja in hrapavost povr{ine pri maksimalni odstranitvi materiala (MRR) z uporabo kombinacije Grey odvisnostne analize
(GRA) in Taguchi metode. Devet preizkusov na podlagi ortogonalne ureditve po Taguchi metodi je bilo izvr{eno za razvoj
objektivnih funkcij in njihovo optimizacijo v podro~ju preizkusov. Objektivne funkcije so bile izbrane glede na proces rezanja:
sila rezanja, hrapavost povr{ine in MRR. Taguchi pribli`ek z Grey analizo odvisnosti je bil uporabljen za re{itev problema
optimizacije z ve~ odgovori. Pomen dejavnikov na kakovostne zna~ilnosti procesa rezanja je bil kvantitativno ocenjen z uporabo
metode analize variance (ANOVA). Optimalni rezultati so bili verificirani z dopolnilnimi preizkusi. Rezultati ka`ejo, da prava
izbira parametrov rezanja zagotovi visoko hitrost odstranjevanja materiala pri bolj{i kakovosti povr{ine in manj{i sili rezanja.