Method for producing low-springback half shells

1. Method for producing low-springback half shells made of a metal, in which blanks are drawn in at least one drawing die, such that the blanks have flange regions on a deep drawn body after the deep drawing, wherein the flange regions are shaped by upsetting a corner substantially perpendicularly to a wall of the body of the deep drawn blank, and the flange regions are subsequently trimmed in a shearing die, such that half shells without margins are produced; wherein a reverse curve is introduced into the flange regions prior to the trimming.

2. Method according to claim 1 , wherein during and/or after the trimming of the flange regions, the body and/or the edges of the trimmed half shells are additionally upset.

3. Method according to claim 1 , wherein the deep drawing of the blank and the shaping of the flange regions takes place in a single operation in the at least one drawing die, the shaping of the flange regions being carried out by a blank holder.

4. Method according to claim 1 , wherein an upsetting component is taken into account in the deep drawing of the blank in the at least one drawing die.

5. Method according to claim 1 , wherein the flange regions are trimmed by punching or using a laser beam.

6. Method for producing closed hollow profiles comprising positioning at least two half shells in such a way that the edges each form a butt joint and welding the half shells to one another along the edges, wherein the at least two half shells are made of a metal, in which blanks are drawn in at least one drawing die, such that the blanks have flange regions on a deep drawn body after the deep drawing, wherein the flange regions are shaped by upsetting a corner substantially perpendicularly to a wall of the body of the deep drawn blank, and the flange regions are subsequently trimmed in a shearing die, such that the at least two half shells without margins are produced.

7. Method according to claim 6 , wherein at least two shearing dies are used to produce the at least two half shells, the at least two half shells are subsequently inserted into two contour dies and the at least two half shells are positioned relative to each other by a form fit of the two contour dies using a suitable device.

8. Method according to claim 6 wherein prior to the welding of the at least two half shells there is inserted between the positioned half shells a resilient hose which is subjected to pressure via a pressure medium and remains between the half shells during the welding.

9. Method according to claim 8 , wherein the resilient hose is thermally protected.