Control of cavitation in superplastic forming through use of aco

Metal deforming – By application of fluent medium – or energy field – Using fixed die

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72 54, 72709, 294211, B21D 2602

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049361287

ABSTRACT:
A method of superplastically forming a part from a blank of material. The blank is placed between opposed die structures and heated to a superplastic forming temperature. Positive fluid pressure is supplied at an increasing rate against a front surface of a blank to stretch the same into a cavity of one of the dies to begin formation of the part. A positive fluid pressure is also applied against the back surface of the blank, and acoustical energy emitted by the material of blank resulting from the occurrence of cavitation in the material is sensed. The sensing of acoustical energy is employed to control one or more of the above parameters until the formation of the cavities substantially reduces or ceases altogether.

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patent: 4516419 (1985-05-01), Agranal
patent: 4708008 (1987-11-01), Yasui et al.
patent: 4713953 (1987-12-01), Yavari

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