Patent ID: 7257982
Filing Date: 2007-08-21
Classification: B21D,B60G,Y10T

Abstract:
1. An apparatus for forming a pipe into a beam member having multiple cross sections used for a torsion beam in a rear wheel suspension system of a vehicle, the apparatus comprising: top and bottom opposing dies mounted to a die frame of the apparatus and relatively movable for forming the pipe into a beam member with a U-shaped or V-shaped cross section transverse to the beam length at a central portion of the beam member and having an extension section at ends of the beam member; upper and lower pad-dies coupled to the top and bottom dies, respectively, to be independently operated in the die frame by a hydraulic cylinder for forming a rectangular section of the pipe into the beam member; and left and right cams installed at both sides of the pipe to be formed into said beam member, on a central line of the pipe, such cams being adapted to move horizontally into the ends of said pipe by means of a hydraulic cylinder for maintaining the inner shapes of the extension section and the rectangular section of the beam member while cooperating with the upper and lower pad dies.