Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-12-20
1998-07-14
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264635, 264313, 264219, B28B 732
Patent
active
057799660
ABSTRACT:
Particularly large-size bell and spigot pipes of ceramic molding material are isostatically pressed within a hollow-cylindrical pressure pot with a molding cavity for the molding compound. An inner core is axially extractable and an elastomeric diaphragm is disposed concentrically around the inner core. The diaphragm is clamped in place at its end face and there is defined between the pressure pot and the diaphragm a chamber which communicates with a source of hydraulic pressure. The inner core is provided with a molding ring on which the bell region of the bell and spigot pipe is formed. The molding ring has a reduced-diameter end region and thus defines two end faces. The two end faces are concentric but axially spaced apart. At least the upper end face of the molding ring is provided with a surface coating of elastic plastic material. An annular gap is defined between the end region of the molding ring and the inner core which, depending on the hydraulic pressure in the cavity, opens and closes a vent port which communicates with the molding cavity. Microcracks in the bell region of the molding can be safely avoided.
REFERENCES:
patent: 2865079 (1958-12-01), Marchioli et al.
patent: 3193900 (1965-07-01), Wendt
patent: 3239591 (1966-03-01), Wendt
patent: 3907949 (1975-09-01), Carlson
patent: 4937025 (1990-06-01), Foster et al.
Fiorilla Christopher A.
Greenberg Laurence A.
Lerner Herbert L.
LandOfFree
Method for manufacturing ceramic bell and spigot pipe moldings does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for manufacturing ceramic bell and spigot pipe moldings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for manufacturing ceramic bell and spigot pipe moldings will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1878901