Coating processes – Rumbling or tumbling
Patent
1987-05-12
1989-07-18
Silverberg, Sam
Coating processes
Rumbling or tumbling
427 11, 106 105, C23C 2400
Patent
active
048492582
ABSTRACT:
Major improvements in Mechanical Barrel Plating are virtual elimination of expensive glass impact media, elimination of larger size glass balls such as 3 mm and 5 mm, with replacement by assorted pieces of small high density rubber or equivalent non-staining pieces acting to stay inside the tumbling mass to lift the article in the charge and to interrupt streamline flow to cause random disoriented movement whereby complete uniform coverage of the articles being coated is achieved.
The further improvement resulting from the elimination of large masses of small glass beads and balls creating an open permeable mix permitting easy access of the plating metal powder such as Zinc to the article being coated. For reaching into thread roots, recessed areas, the use of greatly reduced quantities of sharp quartz sand that does not become lodged because of the use of an improved chemistry containing powerful silicon or other lubricants, lodgement being further prevented by the smearing or scraping action of the rubber pieces such as non-staining white neoprene rubber. Alternatively to the quartz sand, small quantities of irregular glass beads so cheap that they can be discarded after each run, or a mixture of quartz and irregular discardable glass beads added to improve smoothness and shine. The use of the rubber pieces serves to prevent chipping and wear on sharp edges permitting use of large heavy objects without damage and with uniform coverage and penetration on all surfaces being plated, and further the optional use of foaming agents to further cushion and distribute the metal power such as Zinc to all surfaces being coated.
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Clayton and Colleagues, Inc.
Silverberg Sam
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