SHRINK HEMMING OF ALUMINUM ALLOY SHEET METAL

摘要

Hemming, which is folding the edge of sheet metal to 180 degrees or more, is one kind of bending methods in sheet metal forming. The aims of hemming are joining one metal sheet to another, improving the appearance of the edge and adding slightly to the rigidity of the edge. For example, hemming is applied to car frames for joining the inner panel to the outer panel such as door panels. The hemming mechanism is complex. Hemming technology has been developed by many technicians with abundant experience in many trials and errors. Therefore, there have been few studies of theories and experimental data about hemming. It is said that aluminum sheets are used in door panels for reducing of the car weight in the automobile industry field. There are no reports on hemming of aluminum sheets. Therefore, the deformations and defects of shrink hemming are experimentally examined using aluminum sheets as worksheets and the mechanism of the hemming is made clear in this paper.