U. Schwab

Perforated metal sheets for active laminar flow control can be produced by electron beam (EB). This non-traditional machining method is the fastest way to drill millions of holes. Drilling frequencies up to 3000 holes per second can be achieved. In order to find out, which smallest hole size can be drilled, a new special EB generator was developed. Tests were carried out on stainless steel sheets with thicknesses of 0.5 and 1.0 mm. The smallest obtainable hole diameter has been decreased to 40 µm in 0.5m m and to 60 µm in 1.0 mm thick stainless steel. The high power of the focussed electron beam reduces the interference period to the workpiece which above all minimizes the thermal influence on the workpiece. The obtained conical shape of the drill holes as well as the absolute and burr-free exit edge can show advantages for the suction in laminar flow control.

First European Forum on Laminar Flow Technology, Hamburg, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 4 Seiten

DGLR-Bericht, 1992, 1992-06, First European Forum on Laminar Flow Technology; S.270-273; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aerodynamics, laminar flow

Bestellbar

1992