Cemented carbide drill bit

Details Cemented carbide drill bit Cemented carbide drill bit

1984-05-01

1986-04-22

Silverberg, Fred

Cutting by use of rotating axially moving tool

With means to apply transient, fluent medium to work or product

Including tool with duct

408144, 408230, B23B 2710, B23B 5106

Patent

active

045838887

ABSTRACT:
A drill made of cemented carbide, is constructed for compensating for the brittleness of cemented carbide to increase its cross-break strength. For this purpose, the ratio of the diameter c of the web portion (1) to the drill diameter d is set in the range of 25% to 35%, and the flute width ratio (b:a) is set in the range of 0.4:1 to 0.8:1. Further, to decrease the cutting resistance on the drill, the radial rake .theta..sub.r angle of the cutting lip 4 measured at positions spaced at least 2/3 of the drill diameter toward the outer peripheral side is set in the range of -5.degree. to positive valves. Furthermore, to promote the chip ejecting function, the relative distance L between the cutting lip 4 and the flute wall 5 opposed thereto, is decreased.

REFERENCES:
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 2903922 (1959-09-01), Ernst et al.
patent: 2936658 (1960-05-01), Riley
patent: 2966081 (1960-12-01), Kallio
patent: 3779664 (1973-12-01), Caley et al.
patent: 3945807 (1976-03-01), Fukutome
patent: 4116580 (1978-09-01), Hall et al.
patent: 4340327 (1982-07-01), Martins
patent: 4461799 (1984-07-01), Gavrilov et al.

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