What is it about?

In this study, the effects of cutting tool type (Ct), cutting speed (Vc), feed rate (f) and drill bit angle (A) on the average surface roughness (Ra) were investigated in the drilling of Waspaloy superalloy with coated and uncoated solid carbide drills. Experimental studies were performed in the orthogonal array of L18 (21 × 33) by using Taguchi method. In this study, the chip formation and tool wear were also evaluated.

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Why is it important?

When the studies in literature are evaluated it is seen that very few study was made on the machinability of Waspaloy which is a nickel-based superalloy. For this reason, this experimental study and its results will contribute to new scientific researches and scientists.


A second order predictive equation was developed with Linear Regression Analysis and coefficient of correlation for Ra calculated as R2 = 96.9%. The most effective parameters on Ra were determined as A, f, Vc and Ct with 49.44%, 15.0%, 14.45% and 13.47% contribution ratios, respectively. Ra surface roughness values increased with the increasing tool wear. Three types chip formation such as spiral chip, string chip and short chip were observed in the drilling of Waspaloy with solid carbide drills.

Prof.Dr. Ali Riza Motorcu
Canakkale Onsekiz Mart Universitesi

Read the Original

This page is a summary of: The evaluation of the effects of control factors on surface roughness in the drilling of Waspaloy superalloy, Measurement, December 2014, Elsevier,
DOI: 10.1016/j.measurement.2014.09.012.
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