Title:
INSERT DRILL
Document Type and Number:
WIPO Patent Application WO/2018/021753
Kind Code:
A1
Abstract:
The present invention relates to an insert drill comprising: a drill body having an insertion hole formed at the center of the front end thereof, having insert seating portions symmetrically formed on both sides of the insertion hole, and having a first flute formed helically in the longitudinal direction so as to extend from the upper end portion downward along the outer peripheral surface; a center drill insert, the lower end portion of which is inserted into the insertion hole, the center drill insert being formed so as to protrude toward the front end of the drill body, having web blades symmetrically formed on both sides thereof such that the front end portion of the web blades slopes from the center portion toward the lower part of the outside in a circular shape, and the center drill insert having insertion grooves symmetrically formed on both sides of the outer surface thereof, such that the same is incised in an incline of a predetermined length from the upper portion toward the inner center; and first and second cutting inserts having hexahedron shaped cutting blades formed on the four surfaces of the front-surface edges thereof, the first and second cutting inserts being symmetrically formed on both sides of the center drill insert, one side surface of the first and second cutting inserts being forced against the insertion grooves while the front surface thereof stands upright in a direction corresponding to the longitudinal direction of the drill body, and the bottom surface of the first and second cutting inserts adjacent to the one side surface being seated on the insert seating portions, wherein the web blades of the center drill insert and the cutting blades of the first and second cutting inserts are coupled to the drill body so as to be continuous as a whole, thus, during operation, center position selection is easy and the speed of the cutting process is improved.
Inventors:
ROH INWON (KR)
Application Number:
PCT/KR2017/007753
Publication Date:
February 01, 2018
Filing Date:
July 19, 2017
Export Citation:
Assignee:
ROH INWON (KR)
International Classes:
B23B51/02; B23B27/16
Foreign References:
| US8376669B2 | 2013-02-19 | |||
| DE19507213A1 | 1996-09-05 | |||
| KR20150114520A | 2015-10-12 | |||
| KR20130058386A | 2013-06-04 | |||
| KR20160080384A | 2016-07-08 |
Attorney, Agent or Firm:
INTERNATIONAL IP GROUP (KR)
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