Twist drill for drilling, a drill with a cutting insert, and a replaceable cutting insert for a twist drill
AssigneeKennametal Inc.
InventorUlrich Krenzer
Life of this patent
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Abstract
On a drill with a base body and a replaceable cutting insert, the cutting insert lies in a receptacle that runs through the base body at a right angle to the latter's longitudinal axis and is open toward the drill tip, whereby the cutting insert is in contact by means of two diametrically opposite contact surfaces against the side walls of the receptacle. Between each contact surface of the cutting insert and a side wall of the receptacle, there is a groove that extends in the direction of the longitudinal axis, in which groove a clamping wedge sits with a form-fit and a friction-fit, and interacts with the base body and the cutting insert in the manner of a self-locking device that acts toward the drill tip.
Claims20
A drill with a base body (1) and a replaceable cutting insert (3), whereby the cutting insert sits in a receptacle (4) that runs through the base body at a right angle to its longitudinal axis (2) and opens toward the drill tip (16), and whereby the cutting insert (3) is in contact with the side walls (5) of the receptacle (4) with two diametrically opposite contact surfaces, characterized by the fact that between each contact surface of the cutting insert (3) and a side wall (5) of the receptacle, there is a groove (8) that extends in the direction of the longitudinal axis (2), in which groove a clamping wedge sits with a form-fit and a friction-fit and interacts with the base body (1) and the cutting insert (3) in the manner of a self-locking device that is effective toward the drill tip (16).
Dependencies are inferred from the claim text.