Continuous variable-thickness automobile front longitudinal beam inner plate and manufacturing method thereof

Abstract

The invention discloses a continuous variable-thickness automobile front longitudinal beam inner plate and a manufacturing method thereof. The continuous variable-thickness automobile front longitudinal beam inner plate comprises a front longitudinal beam inner plate body of a beam structure, wherein the automobile front longitudinal beam inner plate body is integrally rolled and formed by a whole piece of metal material; the automobile front longitudinal beam inner plate body comprises a body front section, a front transition section, a body middle section, a rear transition section and a body rear section; the body front section, the body middle section and the body rear section are constant-thickness structures, and the front transition section and the rear transition section are variable-thickness structures; the thickness of the body middle section is greater than the thickness of the body front section, and the thickness of the body front section is greater than the thickness of the body rear section; and the thickness of the front transition section and the rear transition section respectively increases gradually from the body front section and the body rear section which are thin to the body middle section. Compared with the prior art, the continuous variable-thickness automobile front longitudinal beam inner plate has the advantages of forming a reasonable combination of flexibility and strength of the beam structure by virtue of the continuous change of the thickness of partial structures, changing the negative effect of the thickness transition and the strength transition at weld positions while ensuring the lightweight, increasing the energy absorption value and improving the formability.

Description

technical field [0001] The invention belongs to the field of design and manufacture of auto parts, and in particular relates to an inner panel of a front longitudinal beam of an automobile with continuously variable thickness and a manufacturing method thereof. Background technique [0002] The inner panel of the front longitudinal beam of the car is mostly a slender longitudinal beam. The front end is connected to the front bumper energy-absorbing box through bolts, and the rear end is connected to the mid-floor of the car through spot welding, and runs through the engine compartment and the cockpit. The main force transmission and energy absorption parts in the event of collision. In this regard, the front part of the stringer needs to have a certain collapse energy absorption effect, the middle part has a good force transmission effect, and the rear part needs to reduce the weight as much as possible in order to reduce weight. [0003] With the development of the automob...

AI Technical Summary

Problems solved by technology

[0004] At present, the structure of the inner panel of the front longitudinal beam of the automobile, such as figure 1 As shown, it is made of three kinds of sheets with different thicknesses that are welded into blanks by laser, and then stamped and formed by a press. Tailored welded blanks can be used to achieve different thicknesses on the same part, so that the parts have different local loads at different positions , and then significantly reduce the weight of the product while meeting the strength requirements, but due to the laser welding process, there is thermal deformation and hardening at the weld, and the thickness change between the sheets is sudden, which is not conducive to product stamping and collapse energy absorption , and the product scrap rate and processing cost are high

[0005] According to the force characteristics of the inner panel of the front longitudinal sill when it bears the load of frontal collision, side collision and rollover, the characteristics of the step-by-step crushing during the collision are mainly considered, and how to carry out an effective design to solve the problem of the inner panel of the front longitudinal sill in the existing laser tailor welding When the automobile collides, the problem that the impact energy cannot be effectively absorbed due to the sudden change of the thickness of the sheet metal and the heat deformation and hardening of welding becomes the core of the present invention.

Images