Drill head for deep hole cutting
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United States of America Patent
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May 23, 2017
Issued Date -
N/A
app pub date -
May 16, 2011
filing date -
May 16, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A drill head for deep-hole drilling includes cutting blade tips brazed to cutting chip discharge ports opened on a head distal end surface, guide pads mounted on a plurality of positions of the circumferential surface at the head distal end side, and a hollow inside portion made into a cutting chip discharge passage communicating with the cutting chip discharge ports. A guide pad portion having an arc surface that slide-contacts with the inner circumference of a cutting hole is formed on the outer end surface of the circumferential portion cutting blade tip.
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