| المستخلص: |
The purpose of this research paper is to focus on the optimization of the surface finish quality of aluminum alloy 7075 and stainless steel 304 materials by using the carbide cutting tools (coated inserts cemented carbide) which has high resistance of deflection, wear and fraction, on CNC turning operation with coolant. The surface finish quality is one of the most specified requirements in a machining process. To obtain the optimal surface finish, the choice of three parameters (feed rate, cutting speed, and depth of cut) were important, with two different nose radii of cemented carbide tool, in the case of aluminum alloy 7075 was turning the process parameters were the feed (0.3,0.5,0.7mm/rev), cutting speed (500,700,900 mm/min), depth of cut (0.5,1.0,1.5mm). In the case of stainless steel 304 the process parameters were the feed (0.3,0.5,0.7 mm/rev), cutting speed (250,300,350 mm/min), depth of cut (0.5,1.0,1.5mm). The series of turning experiments were performed to measure the roughness data. The Taguchi method used for optimization of turning experiments based on a full factorial design to determined three different parameters and levels, by using orthogonal arrays, 9 experiments were obtained. The MINITAB statistical software was used to calculate the signal-to-noise (S/N) ratio, and analysis of variance (ANOVA) the best optimal levels and the effect of the process parameters on surface roughness were obtained. In the experiments number 1, 2 of aluminum alloy 7075, and the experiments number 3, 4 stainless steel 304, all of the four experiments with two different nose radius of carbide cutting tools, the parameters as followed: • The first experiment, the feed (0.3mm/rev), cutting speed (900mm/min), depth of cut (1.0mm). • The second experiment, the feed (0.5mm/rev), cutting speed (900mm/min), depth of cut (0.5mm). • The third experiment, the feed (0.3mm/rev), cutting speed (350mm/min), depth of cut (0.5mm). • The fourth experiment, the feed (0.5mm/rev), cutting speed (250mm/min), depth of cut (1.0mm) A confirmation of experiment to obtained optimal levels of process parameters was carried out in order to demonstrate the effectiveness of the Taguchi method.
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