Start Date
4-1968 8:00 AM
Description
This paper describes the process developed for fabricating beryllium gyro components by hot isostatic pressing. Five different components, an inner gimbal, a gyro sleeve, an accelerometer sleeve, an inner cylinder, and an inner cylinder cover, were fabricated. Although the process varied somewhat for each type of specimen, it consisted primarily of vibratory packing, hydrostatic pressing, hot isostatic pressing, and leaching. Since the most challenging component to be fabricated was the inner gimbal, this paper is devoted primarily to the process development of this particular component.
Two key developments associated with the fabrication of the inner gimbal were the use of a deformable mandrel and the use of a new type of pressure-transmitting medium. The use of a porous copper mandrel allowed even deformation of the preform during cold hydropressing and, as a result, very accurate pressings could be made. A sodium chloride pressure-transmitting layer around the green compact allowed sealing of the irregular shape in a cylindrical pressing container.
Advanced Beryllium Gyro Technology
This paper describes the process developed for fabricating beryllium gyro components by hot isostatic pressing. Five different components, an inner gimbal, a gyro sleeve, an accelerometer sleeve, an inner cylinder, and an inner cylinder cover, were fabricated. Although the process varied somewhat for each type of specimen, it consisted primarily of vibratory packing, hydrostatic pressing, hot isostatic pressing, and leaching. Since the most challenging component to be fabricated was the inner gimbal, this paper is devoted primarily to the process development of this particular component.
Two key developments associated with the fabrication of the inner gimbal were the use of a deformable mandrel and the use of a new type of pressure-transmitting medium. The use of a porous copper mandrel allowed even deformation of the preform during cold hydropressing and, as a result, very accurate pressings could be made. A sodium chloride pressure-transmitting layer around the green compact allowed sealing of the irregular shape in a cylindrical pressing container.
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