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To study the effect of turning parameters on surface
roughness of aluminum casting semi-solid, the experiment
was conducted on a computer numerical control machine
using carbide insert (Plansee Tizit; DCGT 070204FN-27
grade H10T Co 6.0%) as a cutting tool. The 3 cutting factors
were studied including cutting speed, feed and depth of cut
in the range of 130-220 m./min, 0.02-0.1 mm./rev and 0.45-
0.85 mm., respectively. The results showed that feed rate
was the most affected factor to the finish surface
roughness. Decreasing the feed rate gave the better surface
roughness. Finally, the regression equation was validated by
comparing the value of surface roughness from the equation
and the actual experiment. It was found that the absolute
different value was approximately 4.22% which is in the
range of acceptable criteria
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