Drill having multiple flanks
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United States of America Patent
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Oct 7, 2014
Grant Date -
May 17, 2012
app pub date -
Nov 16, 2011
filing date -
Nov 17, 2010
priority date (Note) -
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Abstract
A drill capable of suppressing inter-layer peeling (delamination) while keeping hole diameter accuracy even if the number of holed to be worked increases is provided. The drill includes a first flank which has a ridge line forming a cutting edge, a second flank which is adjacent to the first flank and has a ridge line forming a land portion, and a third flank which is adjacent to the first flank and has a ridge line forming a chisel edge. The drill further includes a fourth flank which is surrounded by a ridge line forming the first flank, a ridge line forming the third flank, and a trough line forming the second flank.
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