Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
THIN DRILL
Document Type and Number:
WIPO Patent Application WO/2019/058592
Kind Code:
A1
Abstract:
[Problem] To protect a leading end section of a drill which has a coolant hole and which makes a fine-diameter or ultrafine-diameter hole in a workpiece. [Solution] A coolant hole 33 is formed axially penetrating a shank part 3 and a shaft part body 7 from the rear end surface 31 to the leading end surface 15. At a leading end section of the coolant hole 33, a pair of discharge holes 35 are formed extending as branches in opposite directions orthogonal to the coolant hole 33, in a slightly more proximal area than the leading end surface 15 of a shaft part body 13, and are formed to open on opposite side surfaces 37, 37 to form discharge ports 39, 39. A leading end opening 41 of the coolant hole 33 is covered by a bottom surface 17 of a drill part 9.

Inventors:
TANABE KATSUJI (JP)
KAWAMATA FUMIHARU (JP)
MATSUSHIMA YOHEI (JP)
Application Number:
PCT/JP2018/008342
Publication Date:
March 28, 2019
Filing Date:
March 05, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SHIBA R&D CO LTD (JP)
International Classes:
B23B51/06; B23B51/00; B24D7/18
Domestic Patent References:
WO2002005990A12002-01-24
Foreign References:
JP2009000806A2009-01-08
JP2016120551A2016-07-07
JP2003275915A2003-09-30
JPS60109868U1985-07-25
Attorney, Agent or Firm:
SHIBUYA, Keiro (JP)
Download PDF:



 
Previous Patent: JOINT

Next Patent: IMAGE PROJECTION SYSTEM