Hochleistungsbohren metallischer Werkstoffe mit Wendelbohrern

(High performance drilling of metallic materials with twist drills)

Opalla, D.

Drilling with twist drills is one of the most frequently applied cutting technologies. The productivity and economy of this type of process can be substantially improved by an increase of the cutting parameters. In order to optimize tools and processes for high performance cutting, an analysis of the mechanisms encountered when extremely increasing the feed rate and the cutting velocity is necessary.

This paper is concerned with the effects of the increase of the cutting parameters on the tool when drilling different metallic materials, with the chip formation process and the cutting result. Contact area investigations show changes in the contact zone between tool and workpiece when increasing the cutting parameters. With respect to the heat distribution, the workpiece, the tool and the chips are regarded. With a special quick stop device chip roots are produced from the real cutting process. The subsequent analysis supplies information concerning the mechanisms involved in the chip formation process.

A high potential is pointed out for the economic application of a high performance drilling process. To determine the optimal design of the process a compromise between the increase of the parameters, the resulting workpiece quality, the tool life and the reliability of the process must be found.

Published as

Dissertation, Universität Dortmund, Vulkan Verlag, Essen, 2003, ISBN 3-8027-8716-1