Manufacturing method for high-strength torsion beam cross beam

Abstract

The invention provides a manufacturing method for a high-strength torsion beam cross beam and belongs to the technical field of automobile accessories. The manufacturing method for the high-strength torsion beam cross beam is provided for solving the problem of how to achieve the effect of improving the strength performance and fatigue resistance of materials. The method includes the steps that a steel plate blank with a ferrite and pearlite dual-phase structure serving as a microstructure is selected and coiled into a round pipe with a corresponding size, then welding is conducted, and the closed round pipe is obtained; then pre-forming and internal high-pressure forming are conducted, and the formed torsion beam cross beam is obtained; and finally, the formed torsion beam cross beam is subjected to hot-working treatment at the temperature of 900-980 DEG C, then cooling quenching is conducted, and the high-strength torsion beam cross beam is obtained. According to the manufacturing method, the obtained product has good tensile strength performance and fatigue endurance performance, the tensile strength can reach 1500 MPa or higher, and the yield strength can reach 1000 MPa or higher.

Description

technical field [0001] The invention relates to a method for manufacturing a high-strength torsion beam, belonging to the technical field of auto parts. Background technique [0002] With the continuous increase of global car ownership and the deteriorating ecological environment, how to reduce the carbon emissions of cars has become the primary problem to be solved by the auto industry in all countries in the world. The weight of a car is directly related to fuel consumption and carbon emissions. Research has found that for every 10% reduction in the weight of a car, its fuel consumption can be reduced by 8%-10%. Therefore, the weight reduction of cars is an effective way to solve this problem. one. The use of high-strength steel can ensure the structural strength of auto parts and meet the collision requirements, while effectively reducing the thickness of parts and realizing the lightweight of auto parts. [0003] Automobile torsion beams are chassis parts of automobile...

AI Technical Summary

Problems solved by technology

Although this method can obtain a torsion beam with a certain strength, however, as the strength of the material increases, the load required to obtain the closed torsion beam and the requirements for the mold are gradually increasing, and the wear of the mold is intensified, which is easy to cause mold failure. The reduction of the service life and the reduction of the yield of parts, etc. Therefore, the strength of the existing internal high pressure forming can only reach about 780MPa, and in order to meet the requirements of the yield, only steel plates with a strength of 600MPa are generally used. material, and in this document, in order to obtain a higher strength finished product, it is achieved by improving the preforming process, but it can only achieve a strength performance of about 428MPa

Since the strength of the material cannot be improved, the torsion beam cannot meet the original design requirements, and the number of fatigue cycles cannot meet the requirements