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US 6,305,925 B1Granted
Apparatus for pressing ceramic powders
AssigneeSacmi- Cooperative Meccanici Imola - Soc. Coop. A.R.L.
InventorGiuseppe Cassani
Life of this patent
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Abstract
In a method for pressing ceramic powders comprising a powder compaction stage within a mould, after exerting the powder compacting pressure the powder is subjected to close-together pressure pulses while maintaining the compacting pressure applied.
Claims12
An apparatus for dry forming powders, which comprises:
- a punch;
- a movable cross-member of a press, wherein the movable cross-member supports the punch;
- a mold opposing said punch, wherein the mold is provided with a forming cavity;
- an elastic membrane having a forward and a rear, the elastic membrane being sealed about a perimeter of the punch, wherein the rear of the elastic membrane faces said forming cavity;
- a feeder for feeding a hydraulic liquid between the membrane and the punch lower surface when the punch interacts with the forming cavity to compress the powder contained within the forming cavity, said feeder comprising a hydraulic liquid source connected to the rear of the membrane via a distributor valve arranged to connect said rear alternately to the source and to discharge, and a pressure pulse generator positioned between said distributor valve and said membrane rear.
2 more elements
Dependencies are inferred from the claim text.