THREE-BLADE TWIST DRILL

THREE-BLADE TWIST DRILL

PROBLEM TO BE SOLVED: To satisfy both requests for cutting stability, processing accuracy and strength security of a cutting edge outer end part, in a three-blade twist drill.SOLUTION: The three-blade twist drill is formed in a structure that a cutting edge 2 is composed of a thinning part cutting e...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: MEGURO KIICHI, KURITSUKA KAZUMASA
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 satisfy both requests for cutting stability, processing accuracy and strength security of a cutting edge outer end part, in a three-blade twist drill.SOLUTION: The three-blade twist drill is formed in a structure that a cutting edge 2 is composed of a thinning part cutting edge 2on the rotational center side and a main cutting edge 2running along a groove surface of a flute, and the main cutting edge 2has a first main cutting edge (a) and a second main cutting edge (b) smaller than the first main cutting edge (a), and the first main cutting edge (a) and the second main cutting edge (b) respectively present a concave circular arc shape of being smoothly recessed backward in the rotational direction of the drill in a front view of the drill.