The invention relates to a B column on a vehicle and a manufacturing method. The B column comprises a B column body, an upper fixed portion fixed to a roof is arranged at the top of the B column body, and a lower fixed portion fixed to a threshold is arranged at the bottom of the B column body. The B column is characterized in that a hard area is arranged on the upper portion of the B column body, a soft area is arranged on the lower portion of the B column body, a transition area is arranged between the hard area and the soft area, a reinforcing pipe is arranged on the hard area, the hard area is a martensitic structure prepared by an ultrahigh-strength steel hot forming process, the strength of the martensitic structure is 1300-1500MPa, the soft area is a ferrite and pearlite structure or bainite structure prepared by slow cooling in an ultrahigh-strength steel hot forming process, the strength of the ferrite and pearlite structure or bainite structure is 500-700MPa, the reinforcing pipe is a hollow pipe prepared by a hydraulic forming process, and the wall thickness of the reinforcing pipe is 1.8mm+/-30%. The sectional design of the reinforcing pipe can be flexibly changed according to the shape of the B column, so that the load of each section is more uniform, and the requirement of the vehicle for light weight is met.
B column on vehicle and manufacturing method
2015-04-15
Patent
Electronic Resource
English
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge / B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL , Bearbeiten oder Verarbeiten von Blechen, Metallrohren, -stangen oder -profilen ohne wesentliches Abtragen des Werkstoffs / B23P Sonstige Metallbearbeitung , OTHER WORKING OF METAL |
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