Metal insert mounting

Details Metal insert mounting Metal insert mounting

1987-07-17

1989-04-25

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

403361, E21B 1046

Patent

active

048238937

ABSTRACT:
Hard metal cutters have the attachment portion of their axial length which is cylindrical in cross section, mechanically secured by a transition fit within cylindrical sockets provided in a suitable steel body, such as, for example, a rock drill bit; the cylindrical sockets contain a local circumferential band of deformed and compressed metal axially spanning the innermost cylindrical boundary of the maximum hard metal diameter upon assembly. This eliminates detrimental tensile stresses due to assembly; and provides a region of high compressive stress to reduce the effective fatigue loads during drilling.

REFERENCES:
patent: T970002 (1978-05-01), Kidder et al.
patent: 3074292 (1963-01-01), Polmon
patent: 3749190 (1973-07-01), Shipman
patent: 4047583 (1977-09-01), Dyer
patent: 4289211 (1981-09-01), Lumen

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