Drilling tool, particularly for metallic materials

Details Drilling tool, particularly for metallic materials Drilling tool, particularly for metallic materials

1995-06-26

1998-01-06

Howell, Daniel W.

Cutting by use of rotating axially moving tool

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

Including tool with duct

408224, 408229, 408230, B23B 5102

Patent

active

057047405

ABSTRACT:
Cutting elements or cutter chips (7, 8) are located on a tool body (1). Cutting chip removal spaces (14, 15) are formed in the tool body in three segments. A first segment (I) adjoins the end face (4) of the drill body and includes at least one cutting element seat (10, 11); a chip removal space extends axially, i.e. straight, or slightly obliquely fluted. A second segment (II), adjacent thereto, is formed partially helically with a twist (21) of less than 90.degree. relative to the tool body axis; the second segment (II) terminates axially at a point where, in operation, the direction of radially acting cutting forces coincides essentially with the primary axis of inertia (0-0) of the geometrical moment of inertia. A third segment (III) adjoins the second segment (II); it is essentially straight-fluted.

REFERENCES:
patent: 283509 (1883-08-01), Pendleton
patent: 3966349 (1976-06-01), Osman et al.
patent: 4149821 (1979-04-01), Faber
patent: 4563113 (1986-01-01), Ebenhoch
patent: 5049011 (1991-09-01), Bohnet et al.
patent: 5173014 (1992-12-01), Agapiou et al.
patent: 5478176 (1995-12-01), Stedt et al.

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