Forming apparatus employing a shape memory alloy die

Details Forming apparatus employing a shape memory alloy die Forming apparatus employing a shape memory alloy die

1987-04-03

1989-01-10

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

Isostatic type

148402, 264 56, 419 68, 425 78, B30B 1200

Patent

active

047970855

ABSTRACT:
An apparatus using a shape memory alloy such as nickel-titanium as a die material in one embodiment is used for performing pseudo-isostatic pressing by using a uniaxial mechanical press to densify a powder mixture, preform or presinter with or without the use of pressure transmitting powder. The apparatus can also be used to perform thermal mechanical work on any article to obtain near net shape. With controlled thermal mechanical processing and fabrication of the shape memory alloy into a die configuration, its shape can be changed from a low temperature configuration to a high temperature configuration after being heated. As a result, near net shape parts can be cold or hot pressed pseudo-isostatically without using an expensive and sophisticated press apparatus of the prior art. In a second embodiment, the shape memory alloy is employed as the expansion tooling for near net shape forming of composite materials. This embodiment utilizes a thin wall and a thick wall tube which are made of a shape memory alloy to perform near net shape compression molding of fiber reinforced composites into closed form structure.

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"55-Nitinol-The Alloy with a Memory", A Report, NASA-SP5110, Jackson, C. M. et al., 1972 pp. 77-79.

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