Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1994-08-09
1996-06-04
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
C04B 3332
Patent
active
055230377
ABSTRACT:
A hollow ceramic rolling element manufacturing method is used to produce hollow rolling elements out of a ceramic material. A support member, which consists of an inflammable volatile material, of a core is inserted into an insert bore in a lower mold member, and a core member of the core is set in a central portion of a cavity formed by a gypsum mold. A slurry a main component of which consists of powder of a ceramic material is introduced from a slurry injection port into a cavity in the gypsum mold closed by engaging joint surfaces of lower and upper mold members with each other. After the slurry in the gypsum mold has been solidified, a layer of the solidified slurry is removed from the gypsum mold, and the molded body removed from the mold is burnt to incinerate the core, whereby a hollow rolling element is produced.
REFERENCES:
patent: 2694245 (1954-11-01), Rogers et al.
patent: 3528809 (1970-09-01), Redmond et al.
patent: 5296180 (1994-03-01), Hayes et al.
Fiorilla Christopher A.
Nippon Thompson Co. Ltd.
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