Manufacturing method of vehicle frame longitudinal beam and vehicle frame longitudinal beam manufactured by same

Abstract

The invention discloses a manufacturing method of a vehicle frame longitudinal beam, and the method comprises a material preparation step, a longitudinal beam forming step, a perforation step, an induction heat treatment reinforcement step and subsequent steps. In the induction heat treatment reinforcement step, the strength of the longitudinal beam is increased by means of scan-type continuous heating and scan-type continuous water spray cooling. The vehicle frame longitudinal beam manufactured by the method is a dual-phase steel material which contains (by volume) 20-30% of non-molten ferrite and 70-80% of low-carbon martensite, and the tensile strength of the vehicle frame longitudinal beam is 1100 to 1300 Mpa and the yield strength of the vehicle frame longitudinal beam is 1000 to 1200 Mpa. By utilizing the design disclosed by the invention, the strength of the longitudinal beam is greatly increased and the production process is simplified; and besides, the production cost is reduced and the application range is enlarged.

Description

technical field

[0001] The invention relates to a manufacturing process of a longitudinal beam, in particular to a method for manufacturing a longitudinal beam of a vehicle frame and a manufactured vehicle frame, and is particularly suitable for the manufacture of a longitudinal beam used in a single-layer longitudinal beam structure vehicle frame. Background technique

[0002] At present, in order to further increase the carrying capacity of vehicles and reduce the weight of vehicles in the automobile manufacturing industry, high-strength steel plates are mainly used in the manufacture of vehicle frames, which are produced by steel factories through composition design, smelting and rolling control. The high-strength steel plate is directly used by the automobile longitudinal beam production plant to manufacture the vehicle frame. However, due to the limited strength of this kind of high-strength steel plate, the load-bearing capacity of the single-layer longitudinal beam fr...