Drill having helical flute for discharging cutting fluid
AssigneeSeco Tools AB
InventorsRobert Stedt, Ronny Karlsson
Life of this patent
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Abstract
A metal cutting drill includes a shank having cutting edges at a front end and helical flutes extending rearwardly from respective cutting edges for conductive cutting fluid away from the front end. The cross-sectional area of each flute, as seen in a plane oriented non-perpendicular to an axis of rotation of the drill, becomes progressively smaller in a rearward direction. A helix angle defined by each flute becomes progressively smaller in the rearward direction. An angle formed between the plane and another plane oriented perpendicular to the axis equals the helix angle at the location where the planes intersect each other and the axis.
Claims11
A drill comprising a shank defining a longitudinal axis of rotation, said shank including a front tip end having at least one cutting edge, a rear end, an intermediate portion disposed between said front and rear ends and at least one helical flute extending from said front end to said intermediate portion for conducting cutting fluid from said front end, said flute configured to provide a gradually increasing volume from said front end to said intermediate portion, a non-fluted portion of said drill defines an outer periphery of said drill in the form of at least one segment of a circle as seen in a plane oriented perpendicular to said axis, a circumferential dimension of said non-fluted outer periphery being substantially constant from said front end to said intermediate portion, said flute defining a helix angle which becomes progressively smaller from said front end to said intermediate portion.
Dependencies are inferred from the claim text.