Patent ID: 8449279

Claim:
A hot isostatic pressing device for performing isostatic pressing treatment to a workpiece, comprising: a high-pressure container for storing the workpiece; a gas-impermeable inner casing disposed inside said high-pressure container so as to surround the workpiece; a gas-impermeable outer casing disposed so as to surround said inner casing from the outside; a heater provided inside said inner casing to form a hot zone around the workpiece, whereby isostatic pressing treatment may be performed on the workpiece using pressure medium gas within the hot zone and kept adiabatically by said inner casing and said outer casing; first cooling means for forcedly circulating pressure medium gas by guiding pressure medium gas upwardly between said inner casing and said outer casing, to the outside of said outer casing through an upper part of said outer casing, downwardly along an inner circumferential surface of said high-pressure container to cool the pressure medium gas, and back to between said inner casing and said outer casing through a lower part of said outer casing; and second cooling means for circulating pressure medium gas by guiding pressure medium gas within the hot zone to the outside of the hot zone, and cooling the pressure medium gas by merging it with the pressure medium gas forcedly circulated by said first cooling means, and for returning a part of the cooled pressure medium gas into the hot zone through the lower side of the hot zone.