DRILL

DRILL

A chip discharging flute (7) is formed in a tip outer peripheral portion of a drill body (1) rotated around an axis (O) in a drill rotation direction (T). A cutting edge (5) is formed in an intersection ridgeline portion between a wall surface of the chip discharging flute (7) facing the drill rotat...

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Hauptverfasser: SATO Akira, NAGASAWA Katsuhiro
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BORING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TRANSPORTING
TURNING
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creator SATO Akira
NAGASAWA Katsuhiro
description A chip discharging flute (7) is formed in a tip outer peripheral portion of a drill body (1) rotated around an axis (O) in a drill rotation direction (T). A cutting edge (5) is formed in an intersection ridgeline portion between a wall surface of the chip discharging flute (7) facing the drill rotation direction (T) and a tip flank (6). The cutting edge (5) includes a main cutting edge portion (5B) extending from an inner peripheral side toward an outer peripheral side of the drill body (1), and a cutting edge shoulder portion (5C) extending from an outer peripheral end (P) of the main cutting edge portion (5B) to an outer periphery of the drill body (1), and is subjected to honing. Compared to the outer peripheral end (P) of the main cutting edge portion (5B), in an outer peripheral end (Q) of the cutting edge shoulder portion (5C), a true rake angle is increased on a negative rake angle side, and a size of the honing decreases.
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A cutting edge (5) is formed in an intersection ridgeline portion between a wall surface of the chip discharging flute (7) facing the drill rotation direction (T) and a tip flank (6). The cutting edge (5) includes a main cutting edge portion (5B) extending from an inner peripheral side toward an outer peripheral side of the drill body (1), and a cutting edge shoulder portion (5C) extending from an outer peripheral end (P) of the main cutting edge portion (5B) to an outer periphery of the drill body (1), and is subjected to honing. 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A cutting edge (5) is formed in an intersection ridgeline portion between a wall surface of the chip discharging flute (7) facing the drill rotation direction (T) and a tip flank (6). The cutting edge (5) includes a main cutting edge portion (5B) extending from an inner peripheral side toward an outer peripheral side of the drill body (1), and a cutting edge shoulder portion (5C) extending from an outer peripheral end (P) of the main cutting edge portion (5B) to an outer periphery of the drill body (1), and is subjected to honing. Compared to the outer peripheral end (P) of the main cutting edge portion (5B), in an outer peripheral end (Q) of the cutting edge shoulder portion (5C), a true rake angle is increased on a negative rake angle side, and a size of the honing decreases.</abstract><oa>free_for_read</oa></addata></record>
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language eng ; fre ; ger
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subjects BORING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TRANSPORTING
TURNING
title DRILL
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