Optimization of Condition Using Response Surface Methodology for Boring Process in S20C Carbon Steel
10.14416/j.ind.tech.2025.12.006
Keywords:
Box-Behnken, Boring, Speed, Overhang length, S20C carbon steelAbstract
This research designed a Box-Behnken experiment and analyzed it using surface response methodology to predict the boring process of carbon steel grade S20C. The experimental variables encompass speed from 800 to 1,700 rpm, feed rate from 0.04 to 0.08 mm/rev, depth of cut from 0.10 to 0.50 mm, and overhang length from 45 to 55 mm. The experiment found that all the main factors affecting the surface roughness values were speed, feed rate, depth of cut, and overhang length. The surface roughness values increase significantly as speed decreases. Moreover, the surface roughness tends to decrease when decreasing the feed rate, depth of cut, and overhang length. The optimal conditions for surface roughness (Ra) of 2.267 micrometers were speed of 1,685 rpm, feed rate of 0.04 mm/rev, depth of cut of 0.39 mm, and overhang length of 45 mm. The experimental results were confirmed by comparing the predicted values with the actual measured values from the experiment, with a maximum surface roughness prediction error of 5%. The comparison of the experimental results revealed that the mean absolute percentage error value of the surface roughness was 3.16 percent, which is less than the specified error value and remains within the acceptable range.
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