Study Of Thermal Effect On Viscosity And Surface Tension Of Metalworking Fluids

Basri, Syahrul Zhafri (2019) Study Of Thermal Effect On Viscosity And Surface Tension Of Metalworking Fluids. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The metalworking fluids viscosity and surface tension are highly influenced by its working temperature. Changes in the working temperature had been affected the metalworking fluids viscosity and surface tension hence its ability to protect tool and maintaining a high quality product. This study had been looked into the metalworking fluid temperature at various spindle speed of computer numerical control (CNC) turning using semi-synthetic coolant. The temperature had been recorded using the thermocouple at the selected spindle speed. Workpiece material that had been used for this study is Inconel 718. The measured response of this study was surface roughness, tool flank wear, temperature, viscosity and surface tension. The metalworking fluids viscosity and surface tension had been measured using the Haake Viscotester 2 Plus and Du Nouy surface tension measuring technique at temperature recorded previously. There were five concentrations that had been conducted in this study which is concentration of 100%, 90%, 80%, 70% and 60%. The data collected was transferred to the software which is Design Expert to analyse the result using analysis of variance (ANOVA). It was observed that the temperature was the important factor which has been influenced the viscosity and surface tension. The result was as temperature increase the viscosity decrease and surface tension had been raise. The degree of relationship between the input parameter against the response had been analysed. Applying the two level factorial design in the experiment, it is observed that the optimize value for viscosity was 2.9639 dPas while surface tension was 68.691 mN/m at 820 RPM for cutting speed and 0.2 mm/rev for feed rate.

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