Process for the production of parts having a cavity by pressing
AssigneeCommissariat a l'Energie Atomique
InventorsMarcel Boncoeur, Frederic Valin
Life of this patent
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Abstract
A process for the production of, in particular, ceramic parts having a cavity by press molding or pressing sealed sheaths. The core used for defining the cavity and preventing subsequent machining operations is initially more voluminous than the desired cavity and has an adequate ductility to allow partial extrusion during pressing. This avoids often excessive mechanical stresses, which can lead to a bursting or shattering of the densified part when the sheath is removed. This process has, application to the hot isostatic pressing of fragile materials.
Claims3
Process for producing parts having a cavity, comprising the steps of:
- filling a sheath with a powder, the sheath containing a core more voluminous than the cavity to be formed and the core being partially surrounded by the powder;
- sealing the sheath;
- and
- applying an external pressure onto the sheath so as to radially contract the sheath, densify and sinter the powder into the part and plastically deform the core to allow the core to partially extrude out of the powder forming the part, the deformed core portion remaining in the part defining the cavity after partial extrusion of the core.
Dependencies are inferred from the claim text.