Analysis of the surface roughness of titanium pieces obtained by turning using different cooling systems

Abstract

The present paper shows an experimental study about the surface roughness of Ti6Al4V titanium alloy bars obtained by turning under low-performance cutting conditions. The design of experiments (DOE) used in the work is a full factorial with all factors identified as possible sources of variation of the surface roughness. Namely: depth of cut, feed rate, spindle speed, type of tool, type of cooling system and measurement location. The analysis of variance is used as method to analyze the data. The statistical analysis shows, as main results, that feed rate, spindle speed, and measurement location are influence on the surface roughness while the type of the cooling system and the type of tool are not factors influencing the roughness independently; their influence on the surface roughness is only produced through their interactions with the spindle speed. As conclusions, the best combinations of the cutting parameters to achieve concrete surface roughness have been selected.