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

Milling operation

End milling is the second most important machining operation after drilling to produce dimensionally accurate FRP components. In particular, for discharging free-form surfaces of large components, this manufacturing process is used.

Due to the intermittent cut, high requirements are placed on the cutting edge integrity, as with metallic materials. Coating chipping and cutting edge breakouts can already occur after short tool life. However, also by uncorrect selection of the tool geometry significant damage such as delamination, fraying and splintering can be caused, for example with regard to the helix angle of the end milling tool. An important innovation is the development of the compression blade (in German: "Kompressionsschneide"), which causes a pushing and a pulling cut due to the counter-rotating tool twisting. Fiber pullout as well as lifting of entire, near-surface cover layers can thus be significantly reduced.

Especially, the processing of carbon fiber reinforces plastics (CFRP) is already high qualitatively machinable. However, the machining of glass fiber reinforced plastics (GFRP) and aramid fiber reinforced plastics (AFRP) has been insufficiently researched due to the mechanical properties of the fibers themselves and the interaction between the fiber and the matrix material, and still requires several further development approaches.