Burnishing drill

Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges

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408227, B23B 5102

Patent

active

053122089

ABSTRACT:
A burnishing drill includes a cylindrical shank and a drill body connected to the shank. Drilling edges, first reaming edges and second reaming edges are formed on a first reduced diameter portion, a second reduced-diameter portion and a third reduced-diameter portion respectively located at a foremost end of the drill body. Each of the reaming edges is inclined with respect to the longitudinal axis of the drill at an angle which is set so as to be within a range of between 5.degree. and 30.degree.. During a boring operation using the drill, a hole is drilled by the drilling edges and the drilled hole is then worked by the first reaming edges and the second reaming edges to provide a smooth inner wall in the drilled hole. Since each of the reaming edges is formed to extend radially outward from the foremost end of the drill and incline axially in the rearward direction at a relatively small angle, the centering property can be greatly improved.

REFERENCES:
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patent: 1514704 (1924-11-01), Jack
patent: 2063753 (1936-12-01), Pohlman
patent: 2479136 (1949-08-01), Schade
patent: 4936721 (1990-06-01), Meyer
patent: 4944640 (1990-07-01), Suzuki et al.
patent: 5071294 (1991-12-01), Suzuki et al.
patent: 5112167 (1992-05-01), Shiga et al.
Rubenshtein et al, "Precision Cemented-Carbide Reamers", Machines and Tooling, (1973), vol. XLIV, No. 2, pp. 40-42.
Patent Abstracts of Japan, vol. 5, No. 187 (M-98) Nov. 1981 re: JP 56-107814.
Patent Abstracts of Japan, vol. 10, No. 277 (M-519) Sep. 1986 re: JP 61-100306.

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