DOUBLE-MARGINED DRILL

DOUBLE-MARGINED DRILL

PROBLEM TO BE SOLVED: To provide a double-margined drill capable of exhibiting excellent working accuracy even in expanding a prepared hole for a long term and also suppressing an increase in cutting resistance. SOLUTION: The drill has first margins 11 forward in a drill normal rotation direction of...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: KAMISHIRO MASAAKI
Format: Patent
Sprache:eng
Schlagworte:
BORING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TRANSPORTING
TURNING
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide a double-margined drill capable of exhibiting excellent working accuracy even in expanding a prepared hole for a long term and also suppressing an increase in cutting resistance. SOLUTION: The drill has first margins 11 forward in a drill normal rotation direction of two lands 9 and 9 along twisted grooves 6 and 6 and a second margin 12 backward in the drill normal rotation direction from the first margins 11 of the respective lands. A width W of the first margin 11 is specified to be 10-20% of a diameter D of the drill. COPYRIGHT: (C)2010,JPO&INPIT