MATERIALS & DESIGN, cilt.45, ss.473-479, 2013 (SCI İndekslerine Giren Dergi)
Nowadays machining of materials in their hardened state, also called hard machining, is a challenge in 25 production of tools and molds. It has some advantages such as lower process time and lower manufac- 26 turing cost when compared to conventional machining. In machining of hard workpiece materials, how- 27 ever, very high stresses act on the tool holder through the cutting tool. These stresses necessitate the tool 28 holder to have some specific properties. Especially in hard milling, the tool holder should have high stiff- 29 ness and should be able to dissipate the energy generated during interrupted cutting. Material cost of the 30 tool holder is also important since lower costs provide a competitive advantage for manufacturers. The 31 material selection for the tool holder should be conducted considering aforementioned requirements. 32 To tackle the difficulty of the material selection with specific properties from a large number of 33 alternatives, multi-criteria decision-making (MCDM) methods have been used. In this paper a decision 34 model including extended PROMETHEE II (EXPROM2) (preference ranking organization method for 35 enrichment evaluation), TOPSIS (technique for order performance by similarity to ideal solution) and 36 VIKOR (VIšekriterijumsko KOmpromisno Rangiranje) methods were used for the selection of the best 37 material for the tool holder used in hard milling. The criteria weighting was performed by compromised 38 weighting method composed of AHP (analytic hierarchy process) and Entropy methods. The candidate 39 materials were ranked by using these methods and the results obtained by each method were compared. 40 It was confirmed that MCDM methods can be used for the solution of real time material selection prob- 41 lems. Tungsten carbide–cobalt and Fe–5Cr–Mo–V aircraft steel were found as the best materials for the 42 tool holder production. The obtained results are found to be rather satisfactory and can be used in design 43 stage of hard machining operations.