THREE-BLADED DRILL

WIPO Patent Application WO/2012/053090

A1

Spiral flutes (18) are configured in such a manner that, with a straight line (AB) connecting a lowest point (A) on the inner peripheral side and an endpoint (B) on the heel side on the outer periphery in the cross sectional shape of the spiral flutes (18) in cross section perpendicular to a shaft center (O) of a shaft section (14) as a reference line, a maximum recessed amount (W) which is the maximum value in the distance between the reference line (AB) and the cross sectional shape falls within the range of 3 to 6% of drill diameter (D). This enables cutting chips to be divided even in the processing of a material to be cut which has relatively high viscosity, and also enables highly-efficient processing by high feeding even relative to the material to be cut, the processing of which has been difficult so far. More specifically, a three-bladed drill (10) for implementing excellent processing by suitably dividing the cutting chips can be provided in the highly-efficient processing by such high feeding as a feeding amount per turn exceeds 5% of the drill diameter (D).

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ITOH KAZUTOYO (JP)
TAKAI KAZUTERU (JP)

PCT/JP2010/068611

April 26, 2012

October 21, 2010

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OSG CORP (JP)
ITOH KAZUTOYO (JP)
TAKAI KAZUTERU (JP)

B23B51/00

WO2010038279A1	2010-04-08
WO2009054400A1	2009-04-30

JP2003025125A	2003-01-29
JPS6352908A	1988-03-07

IKEDA HARUYUKI (JP)
Haruyuki Ikeda (JP)

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