Cutting tool and method for producing the same

Metal tools and implements – making – Blank or process – Drill

Patent

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Details

761081, 408226, B21K 504, B23B 5102

Patent

active

060588071

ABSTRACT:
A method for producing cutting tools incorporated in the present invention is carried out as follows: a shank portion and a drill portion are formed separately such that the inner diameter of a hole made in the shank portion is slightly smaller than the outer diameter of the drill portion. The rear of the drill portion is forcibly inserted into the hole of the shank portion at normal temperature which is room temperature. The diameter of the inner wall of the hole is thereby enlarged, resulting in a tight fitting. After the insertion of the drill portion in the shank portion, the drill portion may be ground to form a drill edge. Before the insertion of the drill portion in the shank portion, the shank portion may be quenched under vacuum or the like, or the surface of the shank portion may be hardened by nitriding.

REFERENCES:
patent: 1539413 (1925-05-01), Fish
patent: 1703899 (1929-03-01), Petley
patent: 2161062 (1939-06-01), Killgore
patent: 3053118 (1962-09-01), Lavallee
patent: 3850054 (1974-11-01), Weissman
patent: 4462293 (1984-07-01), Gunzner
patent: 5048375 (1991-09-01), Kobayashi
patent: 5074025 (1991-12-01), Willard, III
patent: 5526716 (1996-06-01), Arai et al.

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