Patent ID: 7950260

Claim:
A hemming method comprising: a positioning step of bringing a forward surface of a movable die having a guide strip into contact with a workpiece and positioning the movable die so that the guide strip is substantially parallel to a flange at an end of the workpiece; a working step of rolling a guide roller while the guide roller is engaged with the guide strip, and performing hemming on the flange by a hemming roller that rolls in an interlocking manner with the guide roller; and a separating step of separating the movable die from the workpiece after the hemming, wherein the guide strip includes a first guide strip provided on a rear surface of the moveable die and a second guide strip provided on the rear surface of the movable die, and the working step comprises: a first hemming step of rolling the guide roller while the guide roller is engaged with the first guide strip, and inclining the flange while the hemming roller is in contact with the flange, and a second hemming step of rolling the guide roller while the guide roller is engaged with the second guide strip, and pinching the flange and the movable die by the hemming roller and the guide roller.