Machinability of Titanium Alloy 6246 in Drilling Using TiAlN PVD Coated Carbide Insert Tools


Machinability is a measure of how easy it is to machine a material. Surface roughness and surface integrity of machined items, cutting speed, forces at work during machining or energy consumption, tool life, and chip formation are all factors to consider. This paper examines the machinability of titanium alloy 6246 when drilled with TiAlN PVD-coated carbide tools from the standpoint of tool deterioration. The trials were designed using Taguchi L18, with five parameters influencing tool deterioration at mixed levels of 2 and 3. The three types of tool deterioration were identified: built-up edge (BUE), delamination, and chipping. Every drill bit was utilised for a single drilling and then examined using a scanning electron microscope (SEM) from the flank and rake views. Although no wear was identified in this study, tool delamination and tool chipping were seen, even though the drilling depth was just 10 mm. The tool’s outer blade, inner blade, and chisel all had a built-up edge. This BUE is visible from both the rake and flank sides. Regardless of the settings used, BUE is the most prominent deterioration and occurs invariably while drilling this alloy. During the technique of peeling off the BUE, tool delamination may occur. Chipping was linked to a higher feed rate, which could be attributed to a high MRR. Data analysis using Minitab 19 demonstrates that drilling without chilling, 45 mm depth, 27 m/min cutting speed, and 0.08 mm/min feed rate result in the greatest performance of TiAlN tool for drilling Ti6246 heat treated 870oC then water quenched.

Author(s) Details

Mahros Darsin
University of Jember, Mechanical Engineering Department, Jl Kalimantan 37, Jember, 68121 Indonesia.

Tim Pasang
Oregon Institute of Technology, Chair of Department of Manufacturing and Mechanical Engineering and Technology, 3201 Campus Drive, Klamath Falls, OR 97601, Oregon, USA.

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