Patent ID: 9272318
Filing Date: 2016-03-01
CPC Classification: B21C,B21D,B23P,Y10T

Claim Text:
1. Method for producing a hollow profile having a curved portion which has a center of curvature, wherein a blank is preshaped to form a U-shaped profile by introducing a punch into a first die and the U-shaped profile is shaped with a second die to form an O-shaped profile having at least one longitudinal slot, comprising the steps of: preshaping the blank to form a U-shaped profile with an outer limb which faces away from a center of curvature of the U-shaped profile and which is arranged for forming the curved portion of the hollow profile and is at least partially higher than an inner limb of the U-shaped profile which faces the center of curvature and which is arranged for forming the curved portion of the hollow profile.