Throwaway inserts and throwaway drill

Details Throwaway inserts and throwaway drill Throwaway inserts and throwaway drill

1998-01-07

1999-09-21

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

407113, 408224, 408713, B23B 5102

Patent

active

059544597

ABSTRACT:
A throwaway drill capable of machining a workpiece stably in a balanced manner even under high-efficiency, high-load conditions and capable of disposing of chips efficiently and smoothly. The drill carries an outer insert and an inner insert. As shown, each insert has a plurality of cutting edges each having a curved crest, a first slope, and a second slope which is at least partially a curved line. The inner and outer inserts are arranged so that the cutting area to be cut by the outer insert alone is partially cut by a cutting edge portion of the inner insert near its corner, and the cutting area which to be cut by the inner insert alone is partially cut by the crest of one cutting edge of the outer insert.

REFERENCES:
patent: 4297058 (1981-10-01), Armbrust et al.
patent: 4558975 (1985-12-01), Hale
patent: 4676702 (1987-06-01), Reinauer
patent: 4859123 (1989-08-01), Koesashi et al.
patent: 4889456 (1989-12-01), Killinger
patent: 4930945 (1990-06-01), Arai et al.
patent: 5269618 (1993-12-01), Meyer
patent: 5727910 (1998-03-01), Leeb

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