Cryogenic forming

Details Cryogenic forming Cryogenic forming

1977-10-04

1979-06-26

Dean, R.

Metal treatment

Compositions

Heat treating

72364, 72700, 148125, C22F 104

Patent

active

041592174

ABSTRACT:
In a method for cryogenically forming a sheet of aluminum or a solid solution strengthened aluminum alloy wherein the sheet has a maximum thickness of about 0.2 inch, said method comprising forming said sheet into a shaped article of desired configuration by deforming said sheet at a cryogenic temperature in the range of about minus 100.degree. C. to about minus 200.degree. C.,
the improvement comprising:
(a) work-hardening the sheet to at least about 25 percent of maximum hardness prior to the cryogenic deformation; and
(b) conducting the cryogenic deformation in such a manner that (i) at least part of the sheet is deformed by tensile stresses, (ii) the thickness of said part is reduced by at least 2 percent by said deformation, and (iii) the smallest dimension of the area of the part to be deformed is at least equal to the thickness of the sheet.

REFERENCES:
patent: 3149008 (1964-09-01), Forsberg
patent: 3266946 (1966-08-01), Merlin
patent: 3568491 (1971-03-01), Bruner et al.

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