Tubular torsion beam and forming method

Abstract

The invention relates to the field of automobile torsion beams, in particular to a torsion beam and a forming method thereof. A tubular torsion beam is composed of a middle section and left and right ends arranged symmetrically on both sides of the middle section. The cross-section of the middle section is a symmetrical broken line shape, the inner wall of the broken line shape is in close contact with the outer wall, and the inner wall and the outer wall are transitioned through a transitional arc. A method for forming a tubular torsion beam. Determine the shape parameters of the torsion beam. According to the shape parameters of the torsion beam, the initial circular straight tube is selected, axially bent, radially bent, the parts are hydroformed, and the ends are trimmed to obtain the final tubular shape. torsion beam. In the present invention, the middle section is bent into a U-shape or a V-shape with the inner and outer walls close to each other, which has better rigidity, and the end is formed by hydraulic expansion, which has the remarkable advantages of high strength, light weight, low cost and good reliability , has a broad market application prospect.

Description

technical field [0001] The invention relates to the field of automobile torsion beams, in particular to a torsion beam and a forming method thereof. Background technique [0002] The torsion beam of the rear axle of an automobile is one of the key components of the automobile. Its main function is to balance the up and down jump of the left and right wheels, so as to reduce the shaking of the vehicle, keep the vehicle stable and improve the roll stiffness of the vehicle. The components of the torsion beam of the traditional structure are mostly formed by sheet metal stamping, so the openings at both ends are turned outward, and the torsional stiffness of the beam is relatively small; therefore, a stabilizer bar is installed on the axis of the existing torsion beam to improve its torsional stiffness. In addition, due to the eversion of the openings at both ends, in the subsequent welding process with the left and right trailing arms, it is difficult to form a closed structure...

AI Technical Summary

Problems solved by technology

The components of the torsion beam of the traditional structure are mostly formed by sheet metal stamping, so the openings at both ends are turned outward, and the torsional stiffness of the beam is relatively small; therefore, a stabilizer bar is installed on the axis of the existing torsion beam to improve its torsional stiffness. In addition, due to the eversion of the openings at both ends, in the subsequent welding process with the left and right trailing arms, it is difficult to form a closed structure with the overlapping welds with the trailing arms, resulting in poor welding deformation stability. Due to uneven stress, stress concentration will occur near the weld, so the welding process is highly required. At the same time, fatigue damage is prone to occur during use. In order to ensure the reliability of the product, it is necessary to weld additional reinforcement plates in the connection area. To improve the strength of the whole part, the whole production process is complicated, the parts are heavy and the cost is high

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