Title:
METHOD FOR MANUFACTURING DRILL HAVING A PLURALITY OF CUTTING BLADES AND DRILL MANUFACTURED THEREBY
Document Type and Number:
WIPO Patent Application WO/2013/157763
Kind Code:
A1
Abstract:
The present invention relates to a method for manufacturing a drill having a plurality of cutting blades for improving accuracy of a drilling operation and preventing generation of a burr in a drilling process when drilling a comparatively thin steel sheet by a drill manufacturing method, and a drill manufactured thereby, the drill manufacturing method comprising: a grinding step (S10) for grinding an outer circumference of a cylinder after cutting a hard metal alloy material in the predetermined length; a flute processing step (S20); a hill plane-cutting step (S30); a guessing surface plane-cutting step(S40); a second spare surface processing step (S50); a point surface processing step (S60); a first spare surface processing step (S70); and a chamfer processing step (S80).
Inventors:
LEE UN JONG (KR)
Application Number:
PCT/KR2013/002841
Publication Date:
October 24, 2013
Filing Date:
April 05, 2013
Export Citation:
Assignee:
YOUNGJIN TOOLING CO LTD (KR)
International Classes:
B23P15/32; B23B51/02
Foreign References:
| KR20030007691A | 2003-01-23 | |||
| JP2002200510A | 2002-07-16 | |||
| KR20040020853A | 2004-03-09 | |||
| KR200211540Y1 | 2001-01-15 | |||
| KR20040016419A | 2004-02-21 | |||
| KR20030084082A | 2003-11-01 |
Attorney, Agent or Firm:
RHEE, We-Beg (KR)
이외백 (KR)
이외백 (KR)
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