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US 2016/0074945 A1Published application
Twist drill and production method
AssigneeHilti Aktiengesellschaft
InventorsCorinna ACHLEITNER, Guenter DOMANI, Mark WINKLER, Carsten PETERS
Life of this patent
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Abstract
The twist drill (1) has a drilling head (3), a continuous two-flute, three-flute to six-flute helix (4) and an insertion end (5) that are arranged consecutively on a drill axis (2). The helix (4) has a radial outer dimension (18) that varies periodically two, three to six times per revolution around the drill axis (2). The invention also relates to a production method for such a drill.
Claims12
1-11. (canceled)
A production method for a twist drill comprising the following steps:
- milling a plurality of depressions into a circumferential surface of a blank in order to form a network of ribs, first ribs of the ribs being parallel to each other and running along an axis of the blank, while second ribs of the ribs are parallel to each other and run at an angle of inclination slanted relative to the first ribs;
- milling grooves into sections of the first ribs situated between adjacent second ribs;
- and
- forming a drilling head on an end face of the milled blank.
1 more element
A twist drill comprising:
- a drilling head;
- a continuous two-flute, three-flute to six-flute helix;
- and an insertion end arranged consecutively on a drill axis, the helix having a radial outer dimension varying periodically two, three to six times per revolution around the drill axis.
Dependencies are inferred from the claim text.