27-07-2016 дата публикации
Номер: KR101642287B1
The present invention relates to a method to manufacture a lightweight metal exterior material to prevent cracks from occurring during a course of forming an exterior material, to prevent properties from being weakened, to easily perform a surface treatment, and to prevent stains from occurring on the treated surface and, more specifically, relates to a method to manufacture a lightweight metal exterior material wherein after ductile lightweight metal such as aluminum is refrigerated to equal to or lower than 0°C in a state where the ductile lightweight metal is extruded, that is, after forming in a state where ductility is maintained, a strength is raised by pressurization to prevent cracks from occurring in the material during the course of forming or to prevent properties from being changed; and a structure is made denser by pressing after forming, thus preventing stains caused by coating with a finishing material in the treatment process. The method comprises: (A) a low-temperature ...
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