Cryogenic Carbon Dioxide (CO2) cooling on machined surface of titanium alloy

Mat Amin, Fatin Nur Amira (2018) Cryogenic Carbon Dioxide (CO2) cooling on machined surface of titanium alloy. Project Report. Universiti Teknikal Malaysia Melaka, Melaka. (Submitted)

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Abstract

Turning is the process that removes the material to produce external cylindrical or conical surfaces. In this research, uncoated carbides were used in turning of titanium alloy, Ti-6Al-4V ELI (extra low interstitial). Titanium alloys have been created in many applications such as aerospace, medical devices and automotive. Because of that, titanium has a good combination of high quality to weight proportion, good erosion resistance and good fatigue resistance. Nevertheless, titanium alloy is classified as difficult to machine material. Titanium alloy has low thermal conductivity and high chemical reactivity. It is easy to react chemically with the cutting tools material. Thus, it is most challenging material in machining. Cryogenic carbon dioxide (CO2) is one of the technique that introduced in cutting hard material especially titanium alloy. The objective of this study was to identify the significant of cutting parameter on surface roughness during turning of titanium alloy assisted by CO2 cryogenic cooling. In this research, Box-Behnken (BBD) of Response Surface Methodology (RSM) was used to design the experimental matrix runs. The BBD was selected to arrange the cutting parameters of cutting speed with range of 120 to 220 m/min, feed rate with 0.1 to 0.2 mm/rev and depth of cut with range of 0.4 to 0.6mm. Surface roughness was measured using portable surface roughness measurements. The values were recorded for each 20 mm on surface machine until flank wear (Vb) reached 0.2 mm. ANOVA analyses indicated that the feed rate and depth of cut are more significant factor in surface roughness and the linear model is formed. From the results, minimum surface roughness (0.7572 μm) obtained by cutting speed of 120 m/min, feed rate of 0.10 mm/rev and depth of cut of 0.50 mm.

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