Solid drill bit for machine tools
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United States of America Patent
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Apr 1, 2008
Grant Date -
Nov 24, 2005
app pub date -
Jul 26, 2003
filing date -
Aug 2, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A solid drill bit for machine tools has a drill bit body and two indexable inserts arranged at a radial distance from one another in respective insert seats. The inserts have an essentially quadratic contour. Their front-end main cutting edges project axially beyond the drill bit body and radially overlap one another. The outer insert has an outer insert corner and a secondary cutting edge perpendicular to the main cutting edge that projects radially beyond the circumference of the drill bit body. To permit burr-free through-drilling, the main cutting edge of the outer insert is subdivided in its longitudinal extent into a radially inner working section and a rectilinear peeling section adjoining the working section and extending to the outer insert corner. The sections enclose a setting angle of 95.degree. to 120.degree.. The peeling section is set at a positive setting angle of 720.degree. to 87.degree..
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