To prove the validity of the MPI concept, teams from ArcelorMittal Tailored Blanks and ArcelorMittal Global R&D have developed a new LWB H-Frame solution for the rear of an SUV vehicle. The S-in motion® SUV was used as the basis for the design.
The new rear H-frame integrates 11 separate parts – including the rear rails and rear crossmember – into one LWB. Patches have been added to adapt the H-frame for different powertrains. The solution makes maximum use of hot stamping technology and PHS grades such as Usibor® and Ductibor®.
The rear H-frame concept has also been adapted for different vehicle powertrains including BEV and PHEV cars. The solution meets all relevant safety requirements for the global market and has been tested against both European and North American rear-crash load cases.
The solution offers key advantages for OEMs as it:
Costs are reduced by around three percent per vehicle for the sub-assembly.
Watch our VLOG to find out more about the MPI H-frame:
Hot stamping has been chosen as it offers the best geometric possibilities for large parts. An MPI part can be obtained with cold stamping technology, but PHS for hot stamping offer the best mechanical properties for optimal crash performance. They are also the best option to achieve significant weight savings.
More details of the MPI one-part rear H-frame will be published in 2021. Further studies are in development.