Hemming device and hemming method

A hemming method comprising:

• setting a workpiece on a hemming die vertically movably provided on a base in a state while a C-type frame and a pre-hemming punch provided at the C-type frame are retreated;
• advancing said C-type frame and said pre-hemming punch provided at said C-type frame;
• raising said hemming die by a driving section provided between a lower portion of said C-type frame and said hemming die, and conducting provisional hemming to said workpiece by said pre-hemming punch;
• retreating said pre-hemming punch;
• and
• raising the hemming die by said driving section, and conducting hemming to said workpiece by the hemming punch provided on an upper portion of said C-type frame.

A hemming device for hemming a peripheral edge of a workpiece using a lower die, on which the workpiece is set, and an upper die arranged above the lower die, the hemming device comprising:

• a hand mount provided on said lower die side;
• a workpiece grip hand positioning and gripping said workpiece, and positioned and mounted on said hand mount so as to position and set the workpiece on said lower die;
• and
• a hand transport section detachably holding the workpiece grip hand.

A hemming method comprising:

• holding and transporting a workpiece grip hand positioning and gripping a workpiece by a hand transport section;
• mounting said workpiece grip hand on a hand mount so as to set the workpiece on said lower die;
• and
• hemming said workpiece by said lower die and an upper die located above said lower die.