Optimization Of Machining Parameters In CNC Milling For Nylon 6

Liew, Toong Kean (2010) Optimization Of Machining Parameters In CNC Milling For Nylon 6. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This report presents the analysis of the surface roughness for machined nylon 6 and optimization of machining parameters in 3-axis CNC milling for nylon 6 to obtain a good surface finish. Besides, determination the possible effect of CNC milling by conducting the surface roughness measurement on machined work pieces that produced by different parameters setting. Those parameters were cutting speed, feed rate and depth of cut. On the other hand, the response variable of this study was surface roughness. The setup of the experiment was based on the Response Surface Methodology (RSM) method. Furthermore, the surface roughness values were analyzed by using the Design Expert software. Total of 20 trials were conducted by using 3-axis CNC milling machine. Next, the surface roughness produced waschecked by using surface roughness tester. From the results of this study, the surface finishing of the machined surface was influenced by the cutting speed and feed rate.High cutting speed and low feed rate produce the good surface roughness value. Furthermore, the optimum parameters in order to achieve the lowest surface roughness with the value of 0.379μm in this study are 106.81m/min cutting speed,250mm/min feed rate, and 0.325mm depth of cut. However, the combination of low cutting speed and high feed rate result high surface roughness value. Then, a mathematical model, in term of those three machining parameters, has been developed for the response variable prediction using RSM based on the experimental results. The average deviation percentage of the mathematical model in this study is 21.56%.

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