Title:
TWIST DRILL WITH PROCESSED TIP AND TIP PROCESSING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2000052121
Kind Code:
A
Abstract:
To provide a twist drill with enhanced stability of a cutting edge by performing a precise cutting edge processing in the twist drill.
In a twist drill having a curvilinear cutting edge the substrate of which is covered with hard coating, the cutting edge is a curved-face cutting edge in which a ridge line along which a rake face and a flank intersect is formed so that hard grains included in the substrate are formed into the shape of curved surface. Further, as a method of forming the curved surface, grinding is performed so that a grinding medium is allowed to be fluidized by magnetism.
Inventors:
IYORI YUSUKE
KONDO YOSHIHIRO
YUKIMURA ATSUSHI
KONDO YOSHIHIRO
YUKIMURA ATSUSHI
Application Number:
JP21945498A
Publication Date:
February 22, 2000
Filing Date:
August 03, 1998
Export Citation:
Assignee:
HITACHI TOOL ENG
International Classes:
B23B51/00; B24B3/24; B24B31/112; (IPC1-7): B23B51/00