Drill bit structure

Details Drill bit structure Drill bit structure

1985-03-04

1988-03-01

Bilinsky, Z. R.

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 2718, B23B 5106

Patent

active

047282312

ABSTRACT:
A drill bit structure has a drill bit body 4 and a plate-like hard tip member 9. The cutting end of the drill bit body 4 has a groove 7 extending substantially at right angles to the central drill bit axis, and the hard tip 9 is fitted and fixed in the groove 7. The web thickness is 25-35% of the drill bit diameter and the flute width ratio is 0.4:1 to 0.8:1. The rake angle of each cutting lip 10 measured at positions spaced at least 2/3 of the drill bit diameter radially outward from the drill bit center is in the range of -5.degree. to positive values.

REFERENCES:
patent: 1407546 (1922-02-01), Joseph
patent: 1887372 (1932-11-01), Emmons
patent: 1887374 (1932-11-01), Emmons
patent: 2555302 (1951-06-01), Cogsdill
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 3014386 (1961-12-01), Kallio
patent: 3564947 (1947-02-01), Maier
patent: 4160616 (1979-07-01), Winblad
patent: 4583888 (1986-04-01), Mori et al.
Machines Production, No. 365, Nov. 18, 1983, pp. 37-39, Sofetec, Boulogne, France.

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