Drill and drill insert with chipbreaker protrusions
AssigneePramet Tools, S.R.O.
InventorsMartin STRAKA, Roman REINDL, Marios GOLTSIS, Simon HELLBORG
Life of this patent
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Abstract
A drill includes drill body and peripheral insert having a radial cutting edge extending generally in a direction of a radius of the drill body, and a central insert. The peripheral insert includes a rake face including a plurality of chipbreaker protrusions. A first angle measured between a line tangent to forward ends of the plurality of chipbreaker protrusions and the central axis of the drill body extending toward the shank end is an acute angle. Also a peripheral insert is disclosed.
Claims16
A drill, comprising:
- a drill body including a shank end and a tip end, at least two flutes extending from the tip end toward the shank end, and an insert-receiving pocket disposed at the tip end of each flute, a peripheral one of the pockets being disposed closer to a radial periphery of the drill body than to a central axis of the drill body and a central one of the pockets being disposed closer to the central axis of the drill body than to the radial periphery of the drill body;
- a peripheral insert disposed in the peripheral pocket, the peripheral insert having a radial cutting edge extending generally in a direction of a radius of the drill body;
- and
- a central insert disposed in the central pocket, the peripheral insert having a radial cutting edge extending generally in a direction of the radius of the drill body, wherein the peripheral insert includes a rake face including a plurality of chipbreaker protrusions, a first angle measured between a line tangent to forward ends of the plurality of chipbreaker protrusions and the central axis of the drill body extending toward the shank end being an acute angle.
A peripheral drill insert, arranged to be received in a drill, the drill including a drill body having a shank end and a tip end, at least two flutes extending from the tip end toward the shank end, and an insert-receiving pocket disposed at the tip end of each flute, a peripheral one of the pockets being disposed closer to a radial periphery of the drill body than to a central axis of the drill body and a central one of the pockets being disposed closer to the central axis of the drill body than to the radial periphery of the drill body, the peripheral insert being disposed in the peripheral pocket, wherein the peripheral insert comprises:
- a radial cutting edge extending generally in a direction of a radius of the drill body;
- and
- a rake face having a plurality of chipbreaker protrusions, a first angle measured between a line tangent to forward ends of the plurality of chipbreaker protrusions defining a non-zero angle with an associated cutting edge of the peripheral insert.
Dependencies are inferred from the claim text.