Drill bit or corehead manufacturing process

Details Drill bit or corehead manufacturing process Drill bit or corehead manufacturing process

1990-09-14

1992-04-07

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG11, 76DIG12, B21K 502, E21B 1046

Patent

active

051016923

ABSTRACT:
A two-part investment casting process is described which involves first casting a hard material shell (32) such as stellite, which is threaded or profiled internally to allow attachment to a pre-machined shank (44) such that the advantages of a fluid and wear resistant investment casting of complex shape may be combined with a tough and machinable shank to allow attachment to the drill string.

REFERENCES:
patent: 3041688 (1962-07-01), Wilder
patent: 4423646 (1984-01-01), Bernhardt
patent: 4499795 (1985-02-01), Radtke
patent: 4667543 (1987-05-01), Tsugaki et al.
A Realistic Appraisal of the Precision Investment Casting Process, W. O. Sweeny, The Iron Age, Nov. 6, 1947, pp. 86-90.

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