Patent ID: 6485585
Filing Date: 2002-11-26
Classification: C21D,C22F

Abstract:
A method of plastically deforming a cold-worked metal alloy sheet to produce an article having a an orange peel textured surface portion, said alloy being of a composition that undergoes recrystallization at a recrystallization temperature after sustaining a critical cold work strain level, the grain size of the product of said recrystallization being an inverse function of said strain level and the formability of said recrystallization product being a direct function of said strain level, said method comprisingdetermining the amount of cold work strain required to form a sheet metal precursor of predetermined thickness of said alloy that, upon sheet recrystallization and sheet forming at a predetermined temperature at or above said recrystallization temperature, said precursor yields a said article having said orange peel textured surface portion, and thereafter subjecting a sheet of said alloy to said amount of cold work strain to form said sheet metal precursor, heating said precursor sheet to obtain said recrystallization and to allow said forming, and forming said sheet to obtain said orange peel textured surface.