An Assessment On Graphite Milling Process

Yoon, Xue Fang (2010) An Assessment On Graphite Milling Process. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Milling is the process of machining flat, curved, or irregular surfaces by feeding a workpiece past a rotating multiple tooth cutter. End milling process is one of the most fundamental metal removal operation applied in manufacturing industrial. Machining of graphite on milling machine was the focus in this study. Graphite, which has been widely applied in many industrial fields, is selected to be used in this study. Due to the different characteristics of materials, cutting parameters used in machining graphite are different to those used in metal machining. This study will determine the importance of the cutting parameters at the end of the study. For this experiment study, a two level full factorial design was used to analyze the influence of each combination of parameters on surface roughness. The value of surface roughness, Ra, is evaluated by measuring milled surface’s left wall, right wall, and bottom side. The variables in this study include cutting speed, depth of cut, and feedrate. The graphs plotted by Minitab v15 were used to analyze comprehensively in order to find the optimum parameters combination in producing a good surface roughness. Validation of model was performed by comparing the actual Ra (measured by surface roughness tester) and predicted Ra (produced by multiple regression model). It can then estimates how accurately of this regression equation will perform in practice. The error bands for bottom, left wall, and right wall is within 13.58%, 5.44%, and 3.97% respectively. Hence, the regression equation is accurate and constantly fulfills the requirement in this experiment.

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