Drill with a drill point part
AssigneeKennametal Hertel AG
InventorsUlrich Krenzer, Gebhard Mueller, Horst Jager
Life of this patent
Estimating the term…
Abstract
A drill with a drill point part that contains the drill cutter and is made of a solid hard material. The drill point part is replacably attached to the end face of a drill shaft. The drill shaft is penetrated by a shaft groove which extends in an axial direction of the shaft to accomodate the drill point part and can center the drill point part in the groove region. The drill shaft has grooves on its periphery which run in the axial direction and extend into the region of the shaft groove and continue into the region of the drill point part. The drill point part can be clamped on its side faces corresponding to and opposite the groove flanks in a force-locking manner by an insertion-clamping fit in the shaft groove.
Claims19
A drill comprising:
- a drill point part;
- a drill shaft;
- said drill shaft comprising chip grooves to permit chips made by said drill to be removed from a cutting area, said chip grooves being disposed on the periphery of said drill shaft;
- said drill shaft comprising an end;
- said end of said drill shaft comprising a groove;
- said groove being disposed and configured to accomodate said drill point part;
- said drill point part comprising:
- a drill cutter;
- and
- said drill point part being replaceably attachable to said end of said drill shaft;
- said groove comprising two flanks;
- said flanks of said groove each comprising first and second sections, each of said first and second sections comprising a substantial portion of said flanks;
- said drill point part comprising side faces;
- said drill point part being configured to be disposed in said groove with said side faces of said drill point part being disposed opposite said flanks of said groove;
- said drill point part being configured to be held in said groove in a force-locking manner by an insertion-clamping fit by said groove owing to resilient pressure exerted by said flanks of said groove;
- said first section of at least one of said flanks defining a first plane disposed to lie through a plurality of points of the surface of said first section;
- said second section of said at least one of said flanks defining a second plane disposed to lie through a plurality of points of the surface of said second section;
- and
- said first and second sections being disposed and configured such that the first plane and the second plane are disposed at a substantial angle one with respect to the other.
A drill comprising:
- a drill point part;
- a drill shaft;
- said drill shaft comprising chip grooves to permit chips made by said drill to be removed from a cutting area, said chip grooves being disposed on the periphery of said drill shaft;
- said drill shaft comprising an end;
- said end of said drill shaft comprising a groove;
- said groove being disposed and configured to accomodate said drill point part;
- said drill point part comprising:
- a drill cutter;
- and
- said drill point part being replaceably attached to said end of said drill shaft;
- said groove comprising two flanks;
- at least a portion of said flanks of said groove being disposed substantially parallel to one another;
- said drill point part comprising side faces;
- said drill point part being configured to be disposed in said groove with said side faces of said drill point part being disposed opposite said flanks of said groove;
- said drill point part being configured to be held in said groove in a force-locking manner by an insertion-clamping fit by said groove owing to resilient pressure exerted by said flanks of said groove;
- said groove comprising a base between said flanks;
- said groove comprising a slit;
- said base of said groove comprising a surface, said surface of said base being disposed to rise on both sides at a first angle from said flanks of said groove towards the inside in the direction of said slit;
- said drill point part comprising a base surface between said side faces;
- said base surface of said drill point part receding from said side faces towards the inside of said drill point part at a second angle relative to said side faces;
- said second angle being smaller than said first angle;
- and
- said drill point part being clamped in the axial direction on said drill shaft in such a manner against said axial slit that the clamping pressure of said drill point part on said drill shaft exerts a clamping pressure on said flanks of said groove.
Dependencies are inferred from the claim text.