Single-lip deep-hole drill with a chamfered rake face
Assigneebotek Praezisionsbohrtechnik GmbH
InventorJuergen Wenzelburger
Life of this patent
Estimating the term…
Abstract
The invention relates to a single-lip drill with an inner and an outer rake face. Very good hole straightness deviation values and endurance are obtained with the ground face according to the invention.
Claims15
A single-lip drill comprising a drill head, wherein the drill head has a rotational axis, a drill diameter (D), a cutting edge and a longitudinal groove for chip removal, the cutting edge extending from the rotational axis to the diameter (D) of the drill head, the cutting edge having a rake face, characterized in that the rake face comprises an inner rake face and an outer rake face, that the inner rake face is radially to the inside and in the immediate vicinity of the axis of rotation, that the outer rake face is radially to the outside and adjoins the inner rake face, that the inner rake face is in a view from the front toward the drill head in the immediate vicinity of a rake face plane, and that the outer rake face in a view from the front toward the drill head at least in the region of the cutting edge is below the rake face plane, the single-lip drill further comprising a chip breaker groove positioned between the inner rake face and the outer rake face.
A method for manufacturing a single-lip drill, the single-lip drill comprising a drill head, wherein the drill head has a rotational axis, a drill diameter (D), a cutting edge and a longitudinal groove for chip removal, the cutting edge extending from the rotational axis to the diameter (D) of the drill head, the cutting edge having a rake face, characterized in that the rake face comprises an inner rake face and an outer rake face, that the inner rake face is radially to the inside and in the immediate vicinity of the axis of rotation, that the outer rake face is radially to the outside and adjoins the inner rake face, that the inner rake face is in a view from the front toward the drill head in the immediate vicinity of a rake face plane, and that the outer rake face in a view from the front toward the drill head at least in the region of the cutting edge is below the rake face plane, the single-lip drill further comprising a chip breaker groove positioned between the inner rake face and the outer rake face, the method comprising the following steps:
- producing a drill head starting from a blank by grinding.
Dependencies are inferred from the claim text.