Title:
【発明の名称】バニシングドリル
Document Type and Number:
Japanese Patent JP2981055
Kind Code:
B2
Abstract:
A burnishing drill includes a cylindrical shank and a drill body connected to the shank. Drilling edges, first reaming edges and second reaming edges are formed on a first reduced diameter portion, a second reduced-diameter portion and a third reduced-diameter portion respectively located at a foremost end of the drill body. Each of the reaming edges is inclined with respect to the longitudinal axis of the drill at an angle which is set so as to be within a range of between 5 DEG and 30 DEG . During a boring operation using the drill, a hole is drilled by the drilling edges and the drilled hole is then worked by the first reaming edges and the second reaming edges to provide a smooth inner wall in the drilled hole. Since each of the reaming edges is formed to extend radially outward from the foremost end of the drill and incline axially in the rearward direction at a relatively small angle, the centering property can be greatly improved.
Inventors:
SHIGA SEIKI
MATSUSHITA NOBUYA
FUKUI AKIO
YAMASHITA TSUNEHISA
SHIMIZU MANABU
MATSUSHITA NOBUYA
FUKUI AKIO
YAMASHITA TSUNEHISA
SHIMIZU MANABU
Application Number:
JP11011892A
Publication Date:
November 22, 1999
Filing Date:
April 28, 1992
Export Citation:
Assignee:
FUJI SEIKO KK
TOYOTA JIDOSHA KK
TOYOTA JIDOSHA KK
International Classes:
B23B51/08; B23B51/00; B23D77/00; (IPC1-7): B23B51/08
Domestic Patent References:
| JP63306812A | ||||
| JP57100419U | ||||
| JP1117815U | ||||
| JP297510U |
Attorney, Agent or Firm:
Hattori Masaki