Plastic article or earthenware shaping or treating: apparatus – Means providing a shaping orifice – Single inlet – plural shaping orifices
Patent
1978-03-23
1980-11-25
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means providing a shaping orifice
Single inlet, plural shaping orifices
29460, 295272, 76107R, 264 36, 425467, 428933, 428936, B29F 304
Patent
active
042355834
ABSTRACT:
A method is provided for forming an extrusion die of the type used to form a ceramic monolith having thin walls defining a multiplicity of parallel tubular passageways with at least about 100 passageways per square inch, the die having a feed face and a discharge face, the feed face having a plurality of feed holes extending partially through said die and interconnecting with a network of grid slots in the discharge portion of said die formed by a plurality of grid pins which define the slot width and the wall thickness, shape and size of said passageways. The method involves the steps of forming the width of the slots larger than the desired wall thickness of the passageways, and metal plating the slot defining surfaces of the grid pins to obtain the slot width corresponding to the desired wall thickness. Plating is accomplished by the electroless plating technique using a metal selected from the group consisting of nickel, chromium, cobalt and cobalt-nickel. The resulting die has a substantially uniform coating of wear resistant metal which is strippable for replating and continued die use.
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Carter Sidney
General Motors Corporation
Woo Jay H.
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