Back to results
US 6,200,077 B1Granted
Twist drill having multiple flank surfaces for each cutting edge
AssigneeSandvik AB
InventorsInge Svenningsson, Åke Sjolander
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSandvik AB
InventorsInge Svenningsson, Åke Sjolander
Estimating the term…
A twist drill includes a shank which defines a longitudinal center axis and has a helical, chip-transporting flute formed therein. A cutting insert is arranged at a front end of the flute. The insert includes a body forming a cutting edge and a flank surface arrangement situated behind the cutting edge. The flank surface arrangement includes first and second flank surfaces extending at respective first and second acute angles relative to a reference plane which contains the center axis. The sizes of the first and second acute angles are different from one another. In one embodiment, each of the first and second flank surfaces intersects the cutting edge. In a second embodiment, only the second flank surface intersects the cutting edge, with the first flank surface extending from a rear end of the second flank surface.
A twist drill comprising a shank defining a longitudinal center axis and having a helical, chip-transporting flute formed therein, a cutting insert mounted at a front end of the flute, the cutting insert including a body forming a cutting edge and a flank surface arrangement situated behind the cutting edge with reference to a direction of drill rotation, the flank surface arrangement including first and second flank surfaces each extending at respective first and second acute angles relative to a reference plane containing the center axis, the sizes of the first and second acute angles being different from one another wherein both of the first and second flank surfaces intersect the cutting edge.
Dependencies are inferred from the claim text.