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1. (WO2013157763) METHOD FOR MANUFACTURING DRILL HAVING A PLURALITY OF CUTTING BLADES AND DRILL MANUFACTURED THEREBY

Pub. No.:    WO/2013/157763    International Application No.:    PCT/KR2013/002841
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Sat Apr 06 01:59:59 CEST 2013
IPC: B23P 15/32
B23B 51/02
Applicants: YOUNGJIN TOOLING CO.,LTD.
영진툴링 주식회사
Inventors: LEE, Un Jong
이운종
Title: METHOD FOR MANUFACTURING DRILL HAVING A PLURALITY OF CUTTING BLADES AND DRILL MANUFACTURED THEREBY
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).