Hemming apparatus

A hemming apparatus comprising:

• a robot having a hemming attachment including a roller attached thereto;
• and
• a hemming die including:
• a seat configured to support a first panel and a second panel of a panel assembly relative to one another;
• a hemming bed positioned between the seat and an outer periphery of the hemming die, the hemming bed configured to support a first terminal edge of the first panel and a second terminal edge of the second panel of the panel assembly relative to one another;
• and
• a reference surface between the hemming bed and outer periphery of the hemming die,
• wherein the robot is configured to move the roller about the outer periphery of the hemming die in a manner where the roller simultaneously contacts each of first terminal edge of the first panel and the reference surface to fold the first terminal edge of the first panel over the second terminal edge of the second panel to create a flange that secures the first panel to the second panel,
• the simultaneous contact between the roller and each of the reference surface and the first terminal edge of the first panel guides the roller relative to the first terminal edge of the first panel when folding the first terminal edge over the second terminal edge, and
• an angle between the hemming bed and the reference surface lies in a range of about 110 degrees to about 130 degrees.