Patent ID: 7770778
Filing Date: 2010-08-10
Classification: B21D,B23K,Y10T

Abstract:
1. A hemming working method comprising the steps of: providing a hemming working apparatus including a hemming roller rotatably connected to a shaft, the hemming roller having a circular cylindrical portion having a proximal end connected to the shaft and a taper portion extending from a distal end of the cylindrical portion; a positioning step of positioning a first panel formed with a projected portion for welding on a second panel formed with a flange portion; a first bending step that includes the steps of: a second bending step of pressing an end portion of the flange portion toward a surface of the inner panel situated between the projected portion and a bent edge of the flange portion with the distal end of the cylindrical portion such that the end portion of the flange portion is in close contact with the surface of the first panel while simultaneously forming a contact region on a side of the projected portion nearest to the bent edge with the taper portion.