Roller hemming

Abstract

Methods and apparatuses for roller hemming are disclosed herein. An example of a sheet metal roller hemming apparatus includes a first electrode to electrically connect to an electrical power supply and a sheet metal workpiece. The apparatus further includes a second electrode to electrically connect to the electrical power supply and the sheet metal workpiece to cause pulsed electric current to flow through a portion of the workpiece to locally increase formability in the portion of the workpiece. The apparatus still further includes a roller assembly to contact the workpiece to cause the workpiece to bend in the portion of the workpiece when the pulsed electric current is flowing through the portion of the workpiece, and to form a hem.

Dependencies are inferred from the claim text.