Drill bit for drilling rock
AssigneesAlpen-May-Kestag GmbH, Ceratizit Austria GmbH
InventorsRonald Huber, Franz Krenn
Life of this patent
Estimating the term…
Abstract
A drill bit for drilling rock has an elongated shaft and at least one cutting plate at one end. A clearance angle β of the cutting edges, at least in segments, increases with increasing distance from the rotary axis. A wedge angle γ of the cutting edges, at least in segments, decreases with increasing distance from the rotary axis.
Claims7
A drill bit for drilling rock, comprising:
- an elongated shaft having a forward end and defining a rotary axis of the drill bit;
- at least one cutting plate disposed at said forward end of said elongated shaft, said cutting plate being formed with a rake face and a flank enclosing a wedge angle γ therebetween and defining a cutting edge extending from a periphery to said rotary axis of the drill bit;
- said flank enclosing a clearance angle β with a plane extending perpendicular to said rotary axis and said rake face enclosing a rake angle α with the plane;
- wherein α+β+γ=180°, and said flank has segments wherein said clearance angle β increases continuously with an increasing distance from said rotary axis, and said wedge angle γ decreases continuously with an increasing distance from said rotary axis.
A drill bit cutting plate for a drill bit having a rotary axis, the cutting plate comprising:
- a rake face and a flank enclosing a wedge angle γ therebetween and defining a cutting edge extending along an intersection between said rake face and said flank from a periphery to a rotary center of the cutting plate;
- said flank enclosing a clearance angle β with a plane extending orthogonally to an intended axis of rotation of the cutting plate and said rake face enclosing a rake angle α with the plane;
- wherein α+β+γ=180°, and said flank has segments wherein said clearance angle β increases continuously with an increasing distance from the rotary center, and said wedge angle γ decreases continuously with an increasing distance from said rotary center.
A drill bit for drilling rock, comprising:
- an elongated shaft having a forward end and defining a rotary axis of the drill bit;
- at least one cutting plate disposed at said forward end of said elongated shaft, said cutting plate being formed with a rake face and a flank enclosing a wedge angle γ therebetween and defining a cutting edge extending from a periphery to said rotary axis of the drill bit;
- said flank enclosing a clearance angle β with a plane extending perpendicular to said rotary axis and said rake face enclosing a rake angle α with the plane;
- wherein α+β+γ=180°, and said clearance angle β increases continuously with an increasing distance from said rotary axis, and said wedge angle γ decreases continuously with an increasing distance from said rotary axis.
A drill bit cutting plate for a drill bit having a rotary axis, the cutting plate comprising:
- a rake face and a flank enclosing a wedge angle γ therebetween and defining a cutting edge extending along an intersection between said rake face and said flank from a periphery to a rotary center of the cutting plate;
- said flank enclosing a clearance angle β with a plane extending orthogonally to an intended axis of rotation of the cutting plate and said rake face enclosing a rake angle α with the plane;
- wherein α+β+γ=180°, and said clearance angle β increases continuously with an increasing distance from the rotary center, and said wedge angle γ decreases continuously with an increasing distance from said rotary center.
Dependencies are inferred from the claim text.