Document Type : Original Article
Authors
1
Department of Mechanical Engineering, Birjand University of Technology, Birjand, Iran
2
2 Department of Materials Engineering, Birjand University of Technology, Birjand, Iran
3
3 Department of Mechanical Engineering, University of Birjand, Birjand, Iran
10.48311/mme.2026.118866.82951
Abstract
Cutting temperature has a direct impact on tool wear, surface quality, dimensional accuracy, and overall process stability. Excessive heat generation in the tool-workpiece contact zone, particularly when machining high-strength aluminum alloys, can significantly degrade machining performance. In this study, the effects of cutting speed, feed rate, and depth of cut on cutting temperature during the turning of AA7075 alloy were investigated. The experiments were conducted using a TN-50B lathe and K20 grade tungsten carbide cutting tools. The experimental design was performed using the Taguchi method with cutting speeds of 3.534, 7.065, and 19.725 m/min, feed rates of 0.05, 0.07, and 0.09 mm/rev, and depths of cut of 2, 3, and 4 mm. The influence of machining parameters on cutting temperature was evaluated using Analysis of Variance (ANOVA). The results indicated that the depth of cut and feed rate depth of cut had the most significant impact on cutting temperature. Increasing either of these parameters led to a notable rise in temperature due to intensified plastic deformation and friction in the cutting zone. In contrast, cutting speed had a comparatively lesser effect. To improve thermal performance, a graphene coating was applied to the cutting tool surface. Comparative experiments demonstrated that the use of the coated tool, compared to the uncoated tool, resulted in an average reduction of 12.33°C in the measured cutting temperature. These findings confirm that graphene‑coated tools are an effective approach for controlling temperature and improving the machining performance of the AA7075 alloy.
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