US 2019/0184473 A1 · METAL DRILL

Abstract

A drill for drilling a blind hole having a blind hole diameter and a blind hole depth in a metal workpiece is provided, the drill comprising a shaft, defining a drilling direction, and a rotation axis oriented in the drilling direction, the shaft having, on an end pointing in the drilling direction, a cutting edge and a stop shoulder at a distance from the cutting edge which defines the blind hole depth, wherein the cutting edge defines the blind hole diameter by rotating about the rotation axis, the shaft having an enveloping circle diameter which changes along the rotation axis and which is larger than the blind hole diameter on the stop shoulder, the shaft having a first shaft section arranged between the cutting edge and the stop shoulder which reaches to the stop shoulder and in which the enveloping circle diameter is smaller than the blind hole diameter.

Claims20

Dependent claims

A drill bit for drilling a blind hole having a blind hole diameter and a blind hole depth, into a metal workpiece, the drill bit comprising a shank that defines a drilling direction and has an axis of rotation oriented in the drilling direction, the shank having a cutting edge at an end thereof facing the drilling direction and a stop shoulder at a distance from the cutting edge that defines the blind hole depth and is measured against the drilling direction, the cutting edge defining the blind hole diameter by rotation about the axis of rotation, the shank having an enveloping circle diameter which varies along the axis of rotation and which is larger at the stop shoulder than the blind hole diameter, the shank having a first shank portion which is arranged between the cutting edge and the stop shoulder and extends as far as the stop shoulder and in which the enveloping circle diameter is smaller than the blind hole diameter.

Dependencies are inferred from the claim text.

Metal drill

Life of this patent

Metal drill

Life of this patent

Abstract

Claims20