Continuous variable cross-section car front longitudinal beam and preparation method thereof

Abstract

The invention provides a car front longitudinal beam structure and a preparation method thereof. The front longitudinal beam is of a hollow type cavity structure which is formed by connecting an inner plate with an outer plate along a longitudinal extension direction, and comprises an energy absorption region located at the front part of the front longitudinal beam, a support region located at the rear part of the front longitudinal beam and a transition region for connecting the energy absorption region with the support region, wherein a plate material in the energy absorption region is thinner than a plate material in the support region, and the plate material in the transition region is continuously and uniformly transitioned from the energy absorption region to the support region. The inner plate and the outer plate are connected through the adoption of a technology of combining laser welding, spot welding and cementation, so that the front longitudinal beam preparation technology is simple; the transition region of the inner and outer plates is continuously and smoothly connected with the relatively thin energy absorption region and the relatively thick support region, so that difference of front and back performances of the front longitudinal beam is realized, light weight and relatively high collision and energy absorption effects are guaranteed; energy absorbing ribs are arranged uniformly on each surface of the inner and outer plates, so that the car front longitudinal beam structure further improves collision energy absorption and is conductive to further improving car safety performance.

Description

technical field [0001] The invention relates to the field of design of automobile front longitudinal beams, in particular to a continuously variable section automobile front longitudinal beam and a preparation method thereof. Background technique [0002] The front longitudinal beam of the car is an important safety structural part of the car body, which requires strong energy absorption to meet the regulations of the car's frontal collision and front bias collision, reduce the intrusion of the front cabin, and realize the protection of the driver and passengers. The front part of the longitudinal beam is connected with the bumper crash box, and the rear part is connected with the floor longitudinal beam to form a continuous front collision load transmission path. According to different functions, the front part of the front longitudinal beam is required to be easily deformed to absorb as much collision energy as possible, while the rear part is required to have high rigidit...

AI Technical Summary

Problems solved by technology

The automobile front side beams in the prior art generally include two structures and design methods. One way is that the entire automobile front side beams are stamped with steel plates of the same material and equal thickness. The preparation process of such automobile front side beams is relatively simple and beneficial Forming, and can ensure greater rigidity and strength at the rear of the longitudinal beam, but in order to ensure the strength of the rear of the longitudinal beam, the overall design material selection is thicker, which is not conducive to the deformation and energy absorption of the front of the longitudinal beam, and even more unfavorable The overall design of the longitudinal beam is lightweight; another common design structure of the front longitudinal beam of the automobile is the segmented tailor-welded automobile front longitudinal beam shown in the existing patent CN200820238454.2, which includes the front section of the longitudinal beam and the longitudinal beam The middle section, the rear section of the stringer, the front section of the stringer, the middle section of the stringer, and the rear section of the stringer are connected into a whole through tailor welding, and the material thickness gradually increases from the front section of the stringer, the middle section of the stringer to the rear section of the stringer thick, and the three sections of the longitudinal beam are tailor-welded with plates of different materials that meet different functional requirements. This front longitudinal beam structure can realize the use of small molds for parts processing on the premise of meeting the safety of the vehicle body, reducing the manufacturing difficulty and The cost is saved. At the same time, the use of thinner plates in the energy-absorbing area of ​​the front section of the longitudinal beam is beneficial to the deformation and energy absorption during the collision, and can realize the lightweight of the vehicle body. Adding welds on the top, and the thickness of the welds between each section has a sudden change, which often leads to problems such as difficulty in overall forming process control, high quality control requirements, and high process scrap rate.

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