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Title:
DRILL
Document Type and Number:
Japanese Patent JPS6389210
Kind Code:
A
Abstract:

PURPOSE: To prevent the occurrence of a burr and a fracture on a workpiece by removing the burr generated on a drill through grinding and applying surface roughness of 3μmRz or less to the chip discharge direction of a drill groove and about 0.01mm radius to the external end of a cutting edge.

CONSTITUTION: A drill 8 is processed in such a way that a burr generated thereon is removed by grinding, the surface roughness thereof is 3μmRz or less at a groove 9 in a chip discharge direction and an edge 11a of about 0.01mm radius is formed on the external end 11 of a cutting edge part 10. And the cutter part of the drill 8 is immersed, for example, in an ionizing solution and a negative electrode is provided in the solution, thereby applying electrolytic polishing to the drill 8 under an electric charge.


Inventors:
NAKADA JUNJI
Application Number:
JP1986000235653
Publication Date:
April 20, 1988
Filing Date:
October 03, 1986
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
B23B51/00; C23F3/00; C25F3/00; C25F3/22; (IPC1-7): B23B51/00; C23F3/00; C25F3/22



 
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