The partially hardened part with 3D-lasercutting is an assembly with hotforming and coldforming parts and purchased components. In the hardening area of the tunnel, the tensile strength is 1300-1650 Mpa and in the not hardened area of the tunnel, the tensile strength is 530-730 Mpa. Due to connected platform parts in the floor panel it was very demanding to develop a feasible design. Therefore it was necessary to test this design in a prototype tool.


Hot-formed Tunnel

Technologies: Partially hotforming, forming, spot welding and projection welding of weld nuts, automated transfer presses

Production plant: Esztergom/Hungary

Customer/Model: Audi TT

Challenge: It was the first Audi contract of a partial hardening part so the management complexity was high.