Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1992-12-11
1994-05-31
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264101, 264152, 264257, 264263, 264321, 156172, B29C 6720
Patent
active
053167090
ABSTRACT:
A manufacturing method is provided from manufacturing a dipper stick having a box shaped structure including an outer casing member formed of a high strength polymeric composite materials, an inner filler comprising polyurethane foam and disposed inside the outer casing member in order to be integrated with the outer casing member, and a plurality of bushing holders made of polymeric composite material and disposed at respective connecting portions of the box shaped structure in order to be integrated with the box shaped structure. The dipper stick is configured to be connected at the respective connecting portions to a bucket, a boom, dipper and bucket cylinders and a link, respectively. The manufacturing method includes the steps of: forming each bushing holder by a filament winding process and forming the inner filler of polyurethane foam; assembling each bushing holder with the inner filler in order to provide a first assembly; arranging the first assembly in a cavity of a mold of a resin transfer molding system; and then forming the box shaped structure by a resin transfer molding process in which liquid polymeric material is transferred to the mold and a curing treatment is carried out.
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Jean En J.
Kim Chun K.
Kim Jin
Ko Jae I.
Lee Jae W.
Kuhns Allan R.
Samsung Heavy Industries Co. Ltd.
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