Title:
A STRONG HIGH PERFORMANCE TWIST DRILL
Document Type and Number:
WIPO Patent Application WO/2007/143883
Kind Code:
A1
Abstract:
A strong high performance twist drill which aims at providing a high performance twist
drill to solve the existing problems effectively. The twist drill can reduce the
change in value of the rake angle, increase the value of the rake angle especially at
the position approaching the drill core, and improve the cutting condition. The
twist drill comprises a shank and a working part. Said working part comprises a
cutting part and a guiding part. Said cutting part includes a rake face, a relief face,
a main cutting edge and a chisel edge; said guiding part includes rear groove edges
and flutes; wherein, said main cutting edge tilts towards the drill core from
outside to inside; the angle between the main cutting edge and the center vertical
line at the cross section is in the range of 3-25°; said main cutting edge
intersects with back groove face at the narrow chisel edge; the length of the narrow
chisel edge is in the range of 0.03-0.5mm; and the rake angle at the drill core is
positive.
Inventors:
ZHU, Xiaokun (Houxiang Town, Danyang, Jiangsu 0, 212300, CN)
Application Number:
CN2006/001276
Publication Date:
December 21, 2007
Filing Date:
June 09, 2006
Export Citation:
Assignee:
JIANGSU TIANGONG TOOLS CO., LTD (Housiang Town, Danyang, Jiangsu 0, 212300, CN)
江苏天工工具有限公司 (中国江苏省丹阳市后巷镇, Jiangsu 0, 212300, CN)
江苏天工工具有限公司 (中国江苏省丹阳市后巷镇, Jiangsu 0, 212300, CN)
International Classes:
B23B51/00; B23B51/02
Attorney, Agent or Firm:
NAN JING LAW OFFICE OF INTELLECTUAL PROPERTIES (2F No. 177 Guangzhou Road, Nanjing, Jiangsu 4, 210024, CN)