Patent ID: 6257043
Filing Date: 2001-07-10
Classification: B21D,F16B,Y10T

Abstract:
A system for hemming a flange of a sheet metal panel, comprising:a fixture adapted to receive and hold a sheet metal panel having a bend with a flange and a free edge of the flange;a press having a platen movable towards and away from the fixture; anda hemming tool carried by the platen and having a forming face with a first generally planar section constructed to be disposed generally parallel to the underlying portion of the sheet metal panel to be hemmed and to engage an outer portion of the flange of the panel to be hemmed, and a second generally planar section inclined at an included angle of 110 to 160 degrees relative to the first section, extending toward the bend, and constructed to engage an inner portion of the flange immediately adjacent the bend to be hemmed, the forming face being configured so that when the moved platen moves the hemming tool sufficiently towards the fixture and the hemming tool engages the flange to be hemmed, the outer portion of the flange is engaged by the first section of the hemming tool and formed generally flat over and generally parallel to the underlying portion of the sheet metal panel and the inner portion of the flange is engaged by the second section of the hemming tool and formed generally flat at an obtuse included angle of 110 to 160 degrees relative to the outer portion and at an acute included angle to the underlying portion to provide a closed hem with the bend between the sheet metal panel and the inner portion having an outer diameter less than three times the thickness of the sheet metal panel.