Drill bit with pilot point
AssigneeSandvik AB
InventorEero Nygard
Life of this patent
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Abstract
A drill bit for the working of metal has a center pilot tip that transforms into straight cutting edges extending towards the outer periphery of the bit. Each cutting edge forms a cutting angle of 1-20° with a reference plane oriented perpendicular to of the drill axis. Each a cutting edge is inclined in a radially inward and axially rearward direction toward the drill axis. The center tip forms a pilot point angle of 90±2° and a has base that takes up 23-45 percent of the total diameter of the cutting section of the drill bit. The tip has a tip angle of 90±10°.
Claims9
A drill bit for working metal, comprising a body having a center pilot tip at a front end thereof;
- the center tip transforming into two straight cutting edges at a base of the tip, each cutting edge extending toward an outer periphery of the body;
- the body defining a center axis of rotation passing through the cutting tip;
- each cutting edge forming a cutting angle relative to a reference plane extending perpendicularly to the axis, the cutting angles being equal and in the range of 1-20 degrees;
- the cutting tip including two tip edges converging forwardly from the base and forming a tip angle of 90±10°;
- the base, as viewed in a direction along the axis, having a length in the range of 23-45 percent of a maximum diameter of the front end of the drill;
- the tip forming a pilot point angle relative to the reference plane in the range of 90±2°.
Dependencies are inferred from the claim text.