4. Results analysis

4.1 Influence of cutting parameters on chip shape and size

Macroscopic analysis of chip formation has shown that chip shape and size when drilling a CFRP part are not influenced by the choice of cutting parameters. When drilling a carbon/epoxy-type material, the chips take the form of very fine dust, with grain sizes ranging from 0.1 to 4 µm. Such dimensions are extremely hazardous to operators' health. In contrast to glass/epoxy materials, their chips can be of two types: either less fine dust (> 10 µm) than carbon/epoxy, or small, friable chips 5 to 15 mm in length.

Conversely, when drilling an aluminum part, the shape and size of the chips are strongly influenced by the value of the cutting tool feed speed, regardless of the type of cutting tool used in...