The semi-finished product, mostly a straight or bent tube section, is inserted into a forming tool. The upper and lower die of the tool are then closed, the tube is filled with water and is sealed with the aid of axial cylinders.
By applying internal pressures of up to 4,000 bar, the tubes are precisely formed against the die geometry with absolute repetitive accuracy. The simultaneous feeding of the axial sealing cylinders supports the material flow and allows for the highest degrees of forming.
By using stress appropriate design and work hardening effects, a significant weight reduction can be achieved for the components.
Furthermore, the number of components and process steps can be reduced due to the complex shapes that are producible.