Study On The Effect Of The Design Of Machining Parameter On Surface Roughness Of The Aluminum Alloy 7075 Using Design Of Experiment (DOE)

Saifol Anuar , Ahmad (2010) Study On The Effect Of The Design Of Machining Parameter On Surface Roughness Of The Aluminum Alloy 7075 Using Design Of Experiment (DOE). Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

A set of experiments designed to begin the characterization of surface quality for the end-milling process have been performed. The objective of this study is to design CNC Milling program consist some parameter is spindle speed, feed rate and depth of cut on the surface roughness, to determine the optimal machining parameters to achieve the optimum surface roughness value for Aluminum Alloy 7075 under varying conditions, and to understand the programming of Design of Experiments (DOE) using Minitab software (full factorial). A common experimental design using Full Factorial type is one with all input factors set at two levels each. The result shows that there are eight runs for the experiment per material and each run for the experiment will use different value of parameter or factor. Such an understanding can provide insight into the problems of controlling the finish of machined surfaces when the process parameters are adjusted to obtain a certain surface finish. The model, which includes the effect of spindle speed, cutting feed rate and depth of cut, predicted the surface roughness values with an accuracy of about 12%. To predict the surface roughness occurs, the parameters will be use are spindle speed, depth of cut and feed rate. CNC machine will be use. Aluminum Alloy 7075 chosen as a workpiece's material and its dimension is 140mm x 120mm x20 mm.

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