Title:
STEP DRILL
Document Type and Number:
Japanese Patent JP2018118363
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a step drill the step length of each blade of which can be extended without reducing rigidity of the step drill.SOLUTION: A step drill 10 includes a pair of small-diameter hole machining blades 11a, 11b, a large-diameter hole machining blade 12 and a seating surface shaving blade 13. The pair of small-diameter hole machining blades 11a, 11b are arranged on the tip end side of the step drill 10. The large-diameter hole machining blade 12 is arranged so as to have a phase identical to that of the small-diameter hole machining blade 11a of the pair of small-diameter hole machining blades 11a, 11b viewed from the tip end side in a direction of a rotary shaft 20 of the step drill 10. The seating surface shaving blade 13 is arranged so as to have a phase identical to that of the small-diameter hole machining blade 11b of the pair of small-diameter hole machining blades 11a, 11b viewed from the tip end side in a direction of the rotary shaft 20 of the step drill 10.SELECTED DRAWING: Figure 1
Inventors:
KUTSUNA HARUYOSHI
SUGIHARA TETSUYA
KUWAORI MASAHIRO
TAKEZAWA DAISUKE
SUGIHARA TETSUYA
KUWAORI MASAHIRO
TAKEZAWA DAISUKE
Application Number:
JP2017013445A
Publication Date:
August 02, 2018
Filing Date:
January 27, 2017
Export Citation:
Assignee:
TOYOTA MOTOR CORP
TUNGALOY CORP
TUNGALOY CORP
International Classes:
B23B51/00; B23B51/08
Domestic Patent References:
| JPS6430109U | 1989-02-23 | |||
| JPS5840311U | 1983-03-16 | |||
| JPH06198511A | 1994-07-19 | |||
| JP2002036016A | 2002-02-05 |
Foreign References:
| US20100209203A1 | 2010-08-19 | |||
| US20060120814A1 | 2006-06-08 | |||
| KR100509954B1 | 2005-08-25 | |||
| US4531867A | 1985-07-30 |
Attorney, Agent or Firm:
Ken Ieiri