Institut IFT
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Institute of Production Engineering and Photonic Technology
Univ.Prof.DI.Dr. techn.
Friedrich Bleicher

TEC-Lab - Laboratory of Production Engineering
Franz-Grill-Straße 4,
Obj. 221, E311-1
1030 Vienna, Austria


DI Gerhard Wiesinger

+43-(1)-58801-311792
wiesinger@ift.at


Daniel Finkeldei, M.Sc.

+43-(1)-58801-31112
finkeldei@ift.at

Office

Mrs. Andrea Kavourmas

Tel.: +43-(0)1-58801-31106
Fax: +43-(0)1-58801-31195
office@ift.at
Homepage: http://www.ift.at

Drilling operation

Drilling is not only an important production process in machining of conventional materials. Also in machining of FRP components, there is often a demand for drilling operations, such as for example riveting in the aviation industry.

Drilling in FRP places great requirements on tool, machine and the machining process. In particular, the immersion in and the emergence from the component surface to pay particular attention, as this can easily lead to delamination, fraying and splintering. These defects on the workpiece resulting from the machining generally, have to be reworked before further processing and have a negative influence on the mechanical properties of the machined structure. Due to the non-homogeneous and non-reproducible defects, an assessment of the limitation of the mechanical properties at the affected site is difficult. One of the contents of the Initiative FiberCut is the achievement to produce high qualitative holes with good reproducibility.

In addition to the quality during drilling, tool life is still a current problem. Compared with drilling in metallic materials, tool wear is often many times higher when drilling in FRP. Because of the anisotropy of the material, tool wear can be estimated in a difficult way and it is difficult comparable between different machining operations. Moreover, there are only a few empirical values in order to be able to provide an assessment of the situation before the machining process starts.