Title:
TWIST DRILL AND LAMINATE MATERIAL BORING METHOD
Document Type and Number:
Japanese Patent JP2013099851
Kind Code:
A
Abstract:
To provide a twist drill that can suppress formation of exit burrs and burr caps while maintaining drill performance.
A metal-working twist drill includes inner cutting edges forming a point (18) having an angle A of 130°. The outer peripheral parts of cutting edges (55 and 57) form outer cutting parts (59 and 61). The outer cutting part is inclined in a direction opposite to a corresponding inner cutting edge, and forms an angle B of 3° with respect to a plane perpendicular to the axis of rotation of the twist drill. The width D of the cutting edge of the outer cutting part is 10.5% of the diameter of the twist drill. The metal-working twist drill can bore a hole having a reduced burr height.
Inventors:
GOULBOURNE DAVID
Application Number:
JP2013044218A
Publication Date:
May 23, 2013
Filing Date:
March 06, 2013
Export Citation:
Assignee:
DORMER TOOLS LTD
International Classes:
B23B51/00; B23B51/02; B23P15/32
Domestic Patent References:
| JP2001252806A | 2001-09-18 | |||
| JPS59148206U | 1984-10-03 |
Foreign References:
| GB2303809A | 1997-03-05 | |||
| DE10106035A1 | 2002-08-29 | |||
| EP0137898A1 | 1985-04-24 |
Attorney, Agent or Firm:
Takao Watanuki
Takashi Okamura
Horimai Kazuharu
Yoshihiro Hirai
Masahiko Denda
Takashi Okamura
Horimai Kazuharu
Yoshihiro Hirai
Masahiko Denda