Throw-away tipped drill bit

Details Throw-away tipped drill bit Throw-away tipped drill bit

1992-03-30

1992-10-13

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool of specific diverse material

407 50, 407110, 407119, 408231, 408713, B23B 2716, B23B 5100

Patent

active

051545497

ABSTRACT:
A drill bit has a throw-away drill bit tip in the form of an insert (21, 31) secured to a shank (22, 32) to be mounted in a drilling tool. The insert (21, 31) is disengageably mechanically connected to the shank (22, 32) without any screws. The insert (21, 31) is formed of a silicon carbide whisker reinforced alumina sintered body, and the shank (22, 32) is made of steel. Due to this structure, the insert (21, 31) has an excellent wear resistance and an adhesion resistance. The shank (22, 32) has a sufficient toughness against breakage. Such a drill bit does not require any resharpening for continuous use during bit life.

REFERENCES:
patent: 3540323 (1970-11-01), Rishel
patent: 4493596 (1985-01-01), Grunsky et al.
patent: 4527931 (1985-07-01), Sarin
patent: 4789277 (1988-12-01), Rhodes et al.
patent: 4801224 (1989-01-01), Pettersson et al.
Japanese Industrial Standard "Chromium Molybdenum Steels"; No.: JIS G 4105-1979.
Japanese Industrial Standard "Carbon Tool Steels" No.: JIS G 4401-1983.
Japanese Industrial Standard "High Speed Tool Steels" No.: JIS G 4403-1983.
Japanese Industrial Standard "Alloy Tool Steels" No.: JIS G 4404-1983.

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