Method for pneumatic isostatic processing of a workpiece

B - Operations – Transporting – 21 – D

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B21D 26/02 (2006.01) B22D 31/00 (2006.01) B22F 3/15 (2006.01) B22F 3/16 (2006.01) C21D 7/13 (2006.01) C21D 10/00 (2006.01) C22F 1/00 (2006.01) C22F 1/10 (2006.01)

Patent

CA 2305373

A pneumatic isostatic forging process for densification of near net shape workpieces is disclosed. A workpiece (22) is heated prior to the forging process, such as from a previous processing step (14). The workpieces is loaded into a pressure vessel (12). The vessel is pressurized (16) rapidly to achieve a high strain rate to assist in the final closure of voids within the workpiece, the increase in the strain rate lowering the flow stress requirements for the workpiece, making it more susceptible to plastic deformation. The rapid pressurization serves to densify the gas within the vessel, increasing the viscosity of the gas to reduce or prevent absorption of the gas into the workpiece, allowing plastic deformation to take place through a collapsing of the material or removal of the voids. The vessel is then depressurized and the workpiece unloaded.

L'invention concerne un procédé de forgeage pneumatique isostatique permettant de densifier des pièces de forme quasiment nette. Avant de procéder au forgeage, on soumet une pièce (22) à une étape de traitement préalable (14) en la chauffant. On charge ensuite cette pièce dans un récipient sous pression (12), lequel est rapidement pressurisé (16) afin d'atteindre un degré de sollicitation élevé, permettant de fermer définitivement les vides à l'intérieur de ladite pièce. Cette hausse du degré de sollicitation permet par ailleurs de diminuer les besoins en matière de résistance au formage pour la pièce, la rendant ainsi plus apte à une déformation permanente. Cette pressurisation rapide sert en outre à densifier le gaz à l'intérieur dudit récipient, à améliorer la viscosité de ce gaz afin de réduire ou prévenir l'absorption de gaz dans la pièce, et à permettre une déformation permanente grâce à un affaissement du matériau de ladite pièce ou à l'élimination desdits vides. Le récipient est ensuite dépressurisé et la pièce déchargée.

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