Method for producing a core form to be employed in the molding o

Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...

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295276, 29424, 29423, 291495B, 291484L, 308 72, B22D 11126

Patent

active

039598721

ABSTRACT:
A method for producing a core form to be employed in the injection molding of a ball joint bearing which has a spherical bearing surface adapted to encircle the ball of a ball joint resiliently and a plurality of isolated oil retention recesses formed in the bearing surface, comprising the steps of forming a spherical portion corresponding to said bearing surface of the bearing on a core form blank, applying a lead layer onto said spherical portion, removing said lead layer from selected areas of said spherical portion which correspond to said oil retention recesses in the bearing surface to expose the areas, applying a hard chrome plating layer at said exposed areas of the spherical portion to form reliefs which are adapted to form said oil retention recesses in the bearing and removing the remaining portion of said lead layer from the spherical portion.

REFERENCES:
patent: 2636849 (1953-04-01), Brenner
patent: 3012314 (1961-12-01), Otters
patent: 3654683 (1972-11-01), White
patent: 3840977 (1974-10-01), Dimitracopoulos

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