Drilling of filament wound hybrid composite tubes: An experimental study

This work aims to experimentally investigate the effect of the machining parameters (Spindle speed and feed) as well as the tool geometry on the drilling quality of +/- 55 degrees filament wound hybrid composite tubes consisting of mechanical and anti-corrosion layers. Drilling tests were performed with three different spindle speed (1000, 2000 and 3000 rpm) and five different feeds (0.05, 0.1, 0.15, 0.25 and 0.4 mm/rev). The average surface roughness Ra of both mechanical and anti-corrosion layers was also measured at two angles 0 degrees and-45 degrees. Furthermore, the delamination at the hole entry and exit as function of the feed was quantified by means of an optical microscopy. The experimental results revealed that the drilling of the filament wound layer generates a higher thrust force compared to anti corrosion layer. Moreover, it was found that the filament wound layer present a higher surface roughness than the anti-corrosion layer for all the investigated machining parameters. This result is confirmed by SEM observations and 3D surface topography. Finally, optical observations show that the delamination is predominant at the hole entry and increase with the increase in feed.