Metal of manufacturing a composite journal bushing

Details Metal of manufacturing a composite journal bushing Metal of manufacturing a composite journal bushing

Filed on

1984-07-06

Date issued

1988-11-29

Examiner

Eley, Timothy V.

Patent Class

Metal working

SubClass

Means to assemble or disassemble

SubSubClass

Puller or pusher means, contained force multiplying operator

Other Related Categories

291495R, B21D 5310

Type

Patent

Status

active

Patent number

047871296

Description

ABSTRACT:
A method of manufacturing a composite plain bearing is shown comprising the steps of forming, through pressing and sintering of powdered-metal, a porous base member defining a bearing surface having a height greater than four times its wall thickness, disposing the porous member in intimate engagement with a backing member, and infiltrating an anti-galling metal alloy into the pores to substantially fill the pores and concomitantly braze the members into an integral unit, subsequent steps of finishing the integral unit prior to assembly as a bearing surface in a rock bit, include machining the I.D. and O.D. thereof, and heat treating to harden the base member.

REFERENCES:
patent: 2168301 (1939-08-01), Lemming et al.
patent: 4105263 (1978-08-01), Sorensen et al.
patent: 4172395 (1979-10-01), Keller
patent: 4207658 (1980-06-01), Sorensen
patent: 4402617 (1983-09-01), McDowell
patent: 4456577 (1984-06-01), Kawakita et al.
patent: 4466165 (1984-08-01), Otto
Keystone Carbon Co., Powder Metallurgy, 9-17-45, pp. 7 and 17-20.
"Introduction to Powder Metallurgy" by Joel S. Hirshhorn, American Powder Metal Institute, 1969, Second Printing 1976.
"Powder Metallurgy" by C. H. Samans, 1948 Edition of Metals Handbook (ASM).

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