Metal of manufacturing a composite journal bushing
AssigneeDresser Industries, Inc.
InventorRobert L. Williamson
Life of this patent
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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.
Claims6
A method of manufacturing a composite journal bearing defining a first member of an axial height having a bearing surface and an opposite surface at a desired wall thickness therebetween and a second member, generally co-extensive with said opposite surface and attached to said opposite surface to provide a backing for said first member comprising the steps of:
- forming, through pressing and sintering of powdered steel alloy, said first member having communicating pores generally throughout and having, as formed, a height to wall thickness ratio greater than 4;
- providing a metal backing member in intimate engagement with said opposite surface of said first member;
- infiltrating an anti-galling molten metal alloy into said pores to substantially fill said pores and concomitantly brazing said members into an integral unit from a surface on said first member other than said bearing surface;
- and,
- finishing said integral unit prior to assembly as a bearing by appropriate machining and heat treating.
Dependencies are inferred from the claim text.