Superplastic forming process

Details Superplastic forming process Superplastic forming process

1985-12-09

1987-12-22

Spruill, Robert L.

Metal deforming

By application of fluent medium, or energy field

Using fixed die

72 54, 72709, 29421R, B21D 2602

Patent

active

047139536

ABSTRACT:
Heated superplastic material is deformed using gas pressure which forces the material into a die cavity. Improved three dimensional models for deforming superplastic materials are based upon spherical shapes penetrating the die cavity which is approximated by one of two different rectangular box models. The three dimensional and box models produced radius and thickness equations from which an accelerated gas pressure versus time profile and a minimum thickness value are calculated. The gas pressure deforms the superplastic material at the maximum possible strain rate without rupturing thereby reducing the speed at which parts are formed. Die frictional effects and variable flow stress phenomena are included into the pressure versus time profile computation and thickness equations so as to improve the speed and accuracy of the superplastic forming process.

REFERENCES:
patent: 4181000 (1980-01-01), Hamilton et al.
patent: 4233829 (1980-11-01), Hamilton et al.
patent: 4233831 (1980-11-01), Hamilton et al.

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