Boots – shoes – and leggings
Patent
1991-06-10
1992-12-01
Malzahr, David H.
Boots, shoes, and leggings
72702, 148502, 148695, 364472, G06F 1546
Patent
active
051681692
ABSTRACT:
A method is disclosed for developing the contour of tools employed for forming aluminum alloy members exhibiting complex shapes. The members are precipitation, heat-treatable, aluminum alloys which are age formed. The resulting member is formed to the desired contour and, simultaneously, is heat treated to reduce residual stresses while improving its strength characteristics. The invention is particularly concerned with a new tool contour prediction method which is based upon the relationship, for a particular aluminum alloy, of the strain retained in a part after it has been subjected to an applied strain while constrained to a desired shape, then released after being heat treated in an autoclave or furnace.
REFERENCES:
patent: 4819467 (1989-04-01), Graf et al.
patent: 4989439 (1991-02-01), Ewert et al.
"Age Forming Integrally Stiffened, Aluminum Aerospace Structures in an Autoclave" (AIAA 89-2087), Brewer, H., AIAA/AHS/ASEE Aircraft Design, Systems and Operations Conference, Seattle, Wa., Jul. 31-Aug. 2, 1989, pp. 1-12.
"Autoclave Age Forming Large Aluminum Aircraft Panels", Holman, Mitchell C., Journal of Mechanical Working Technology, 20 (1989) 477-488, Elsevier Science Publishers B.V., Amersterdam.
"Age Forming Technology Expanded in a Autoclave", Hambrick, D. M., Society of Automative Engineers, Inc., 1986, pp. 4.649-4.663.
"Metallurgy of Heat Treatment and General Principles of Precipitation Hardending", Chapter 5, Aluminum-Properties and Physical Metallurgy, Ed. Hatch, J. E., American Society for Metals, Metals Park, Ohio, 1984, title page, copyright page, table of contents (2 pages), pp. 134-139 and 177-193.
"Age Forming Aluminum in an Autoclave", H. Brewer, Jr. and M. Holman World Aerospace Technology 1990, Sterling Publications International Limited, London, 1990, cover, pp. 3, 7, 11, and 41-46.
Brewer, Jr. Harold M.
Holman Mitchell C.
Avco Corporation
Malzahr David H.
Muir Patrick D.
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