Drill
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United States of America Patent
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Aug 25, 2015
Grant Date -
Aug 9, 2012
app pub date -
Jan 4, 2012
filing date -
Feb 8, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Twist drill for short hole drilling with two chip flutes opening in a clearance surface of a front tip to form, with the clearance surface, two cutting edges. Chip flutes have three different part surfaces having different curvatures—a bottom surface with arc radius less than 10 mm and two other ones with radius of curvature approaching infinity. Boundary line between concave bottom surface and heading frontal surface meets a main edge that is included in the individual cutting edge and divided into two edge segments imparting a J-like shape to the main edge. The chip flute is extraordinary deep with the diameter (DC) of the core reduced to a minimum and the opening angle (α) smaller than the angle of divergence (β) of two bars, between which the flutes are countersunk. The drill improves-formation and evacuation of chips, is easy-cutting and requires a minimum of energy.
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