High-stress and long-service-life variable section single steel plate spring and manufacturing method thereof

Abstract

The invention relates to the technical field of steel plate spring machining, in particular to a high-stress and long-service-life variable section single steel plate spring and a manufacturing methodthereof. The high-stress and long-service-life variable section single steel plate spring comprises a single steel plate spring body which is high-strength spring flat steel, wherein the tensile strength of the high-strength spring flat steel is larger than or equal to 1,870 MPa, and the yield strength is larger than or equal to 1,680 MPa; after forming, the section of the variable section singlesteel plate spring is in a parabola shape changing in the length direction of the variable section single steel plate spring, and front-back symmetry and left-right symmetry are achieved with a center bolt hole as the center. The manufacturing method of the high-stress and long-service-life variable section single steel plate spring comprises the procedures of material breakage, center hole machining, heating, variable section forming, lug rolling, forming heat treatment, shot blasting, electrophoresis paint spraying and warehousing. Through two-time shot blasting including free shot blastingand high-stress shot blasting, the residual compressive stress of the surface of the stretching side of the single spring is improved. The high-stress and long-service-life variable section single steel plate spring is simple in structure, and the single steel plate spring manufacturing process is simplified; and meanwhile, the bearing capability is improved, the vehicle lightweight design requirement is met, the tensile fatigue strength of the single steel plate spring is improved, and the fatigue life of the single steel plate spring is prolonged.

Description

technical field [0001] The invention relates to the technical field of leaf spring manufacturing, in particular to a high-stress, long-life variable-section single-plate leaf spring and a manufacturing method thereof. Background technique [0002] As the elastic element of the vehicle suspension, the leaf spring is widely used in the rear suspension of light passenger vehicles because of its simple structure and reliable operation. With the continuous improvement of the comfort and reliability requirements of light passenger cars and the requirements for lightweight vehicles, the application of fewer leaf springs with variable cross-section is becoming more and more extensive. The leaf springs with variable cross-section are composed of 1 to 4 pieces The middle section is the thickest, and it is composed of leaf springs that gradually become thinner towards both ends. Although the leaf spring with a small number of variable cross-sections reduces the friction between the ree...

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Problems solved by technology

With the continuous improvement of the comfort and reliability requirements of light passenger cars and the requirements for lightweight vehicles, the application of fewer leaf springs with variable cross-section is becoming more and more extensive. The leaf springs with variable cross-section are composed of 1 to 4 pieces The middle section is the thickest, and it is composed of leaf springs that gradually become thinner towards both ends. Although the leaf spring with a small number of variable cross-sections reduces the friction between the reeds, the friction between the reeds that affects the comfort of the vehicle still exists ( The friction between the reeds causes the stiffness of the leaf spring to increase during the movement), and at the same time, in order to ensure the reliability of the leaf spring, the maximum stress of the leaf spring design is often lower than 1000MPa, thus ignoring the full use of the material properties; the traditional plate spring In the production process of the spring, due to the influence of the production process, free shot peening or stress shot peening is usually used. Even if stress shot peening is used, due to the limitation of the performance of the leaf spring material, the precompression stress and shot peening intensity during stress shot peening Insufficient, resulting in failure to improve the tensile strength of the leaf spring and the level of residual compressive stress on the surface of the reed, so that the fatigue life of the leaf spring cannot be effectively improved

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