Investigation of the effect of using support plate on delamination in drilling carbon fiber reinforced composite materials

Composite materials are widely used in aviation, sports, space and maritime sectors due to their superior properties such as high hardness, lightness and high strength. The machining of composite materials is usually to achieve the appropriate tolerances. In this study, delamination that occurs during drilling, which is one of the most important factors affecting productivity and is of great importance in machining, has been examined. In the experiments, the carbon fiber material was tested with 300, 600, 900, 1.200 and 1.500 mm/min. with feed rates and 3.000, 6.000 rpm. It was made on a vertical machining center by direct drilling method using spindle speed parameters. Drilling operations were carried out with a coated drill in the experiments. Delamination calculation was made with the measurements taken in the drilled holes. As a result of the experiments, surface roughness measurements of the holes were made, images were taken with electron microscope and scanning electron microscope, and both delamination and hole quality were examined. As a result of the experiments, the best delamination performance was achieved at low feed rate and low spindle speed in aluminum supported plate drilling.