Rock drill tool, rock drill bit and production method
AssigneeSandvik Intellectual Property AB
InventorPeter Nava
Life of this patent
Estimating the term…
Abstract
A rock drill tool, which comprises a rock drill bit as well as a drill rod detachably connected with the rock drill bit, where the joint between the rock drill bit and the drill rod is effected by means of a conical connection. The rock drill bit has a generally conical cavity, and the drill rod has a generally conical portion. The conical cavity is provided with a crest-shaped projection, which has a rectilinear extension along the envelope surface of the conical cavity, that the conical portion has a groove, which has a generally rectilinear extension along the envelope surface of the conical portion, and that the crest-shaped projection is received in the groove. A rock drill bit and a production method are also disclosed.
Claims10
A rock drill tool, comprising:
- a rock drill bit;
- and
- a drill rod detachably connected to the rock drill bit, the joint between the rock drill bit and the drill rod being effected by means of a conical connection,
- wherein the rock drill bit has an, at least partly, conical cavity,
- wherein the drill rod has a generally conical portion, the conical portion having a driver member that is positioned within an envelope surface of the conical portion, one end of said driver member situated closer to an end of the conical portion than is a second end of the driver member,
- wherein the conical cavity is provided with a projection, said driver member overlapping the projection, and
- wherein the projection is in the shape of a ridge.
A rock drill bit to be included in a conical connection, the rock drill bit comprising an, at least partly, conical cavity, the conical cavity being provided with a projection, an end of the projection being situated closer to a bottom of the cavity than is the other end of the projection, wherein the projection has a shape of a rectilinear ridge.
A method for the production of an, at least partly, conical cavity of a rock drill bit, which is intended to be included in a conical connection, the method comprising:
- reaming by means of an end milling cutter at least a portion of the conical cavity,
- wherein a relative motion between the rock drill bit and the end milling cutter during reaming is around a first centre axis of the rock drill bit, and
- wherein the relative motion is 80-90% of a full revolution around the centre axis.
Dependencies are inferred from the claim text.