Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
2006-01-24
2006-01-24
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C451S048000
Reexamination Certificate
active
06988859
ABSTRACT:
The invention relates to a drill bit (2), having main cutting edges (4a, 4b) which are connected together by a transversal cutting edge (6). An open surface (7) which extends into a flute (8) lies adjacent to each main cutting edge. The drill bit (2) is ground, in particular, during a continuous three-dimensional grinding process in such a way that the open surface (7) forms a continuous curved surface which follows a radius of curvature (R) running from the main cutting edge (4a) in the direction of the flute (8). The continuous grinding process, in comparison to a conventional two-stage process, produces an improved drill bit geometry which is devoid of ridges (16). The ridge-free configuration reduces the mechanical stress during drilling to a minimum.
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Dubbel, Taschenbuch für den Maschinenbau 15, korrigierte und ergänzte Aulflage, Herausgegeben von W. Beitz und K.-H. Küttner, Springer-Verlag, Berlin, Heidelberg, N.Y., Tokyo 1983.
Borschert Bernhard
Mühlfriedel Dieter
Howell Daniel W.
Kennametal Inc.
Nils H. Ljungman & Associates
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