Design method for the blanking length of each secondary spring of high-strength one-stage gradient stiffness leaf spring

Abstract

The invention relates to a design method for the blanking length of each secondary spring of a high-strength one-stage gradually changing stiffness leaf spring, and belongs to the technical field of suspension leaf springs. According to the present invention, the structural parameters of each main spring and auxiliary spring, modulus of elasticity, initial tangent arc height of the main spring, and initial contact load are calculated based on the design of the initial tangent arc height of the auxiliary spring and the calculation of the initial surface shape of the first auxiliary spring. Surface micro-elements and superposition calculations are used to accurately design the unsprung length of each piece. It can be seen from the blanking process test of the prototype that the design method of the blanking length of each secondary spring of the high-strength one-level gradual stiffness leaf spring provided by the present invention is correct, which has laid an important technical foundation for the development of CAD software. The method can be used to obtain the accurate design value of the unsprung material length of each piece, which can increase the material saving rate, improve the processing technology, and increase the production efficiency; at the same time, the design and test costs are reduced, and the product development speed is accelerated.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method for the blanking length of each auxiliary spring of a high-strength one-stage gradually changing stiffness leaf spring. Background technique [0002] With the emergence of high-strength steel plate materials, high-strength one-level gradient stiffness leaf springs can be used. There is a gradual gap between the upper surface of the first auxiliary spring and the lower surface of the last main spring to meet the different contact loads. Under the design requirements of gradient stiffness, suspension bias frequency and vehicle ride comfort, the surface of the auxiliary spring is neither a circular surface nor a slanted surface, let alone a parabolic surface, but a cubic curved surface. Therefore, according to the Spring span, adopting the traditional design method to design the blanking length of each auxiliary spring, it is difficult to obtain the accurate blanki...

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Problems solved by technology

[0002] With the emergence of high-strength steel plate materials, high-strength one-level gradual stiffness leaf springs can be used, and a gradual gap between the main and auxiliary springs is designed between the upper surface of the first auxiliary spring and the lower surface of the last main spring to meet the different contact loads. Under the design requirements of gradient stiffness, suspension bias frequency and vehicle ride comfort, the surface of the auxiliary spring is neither a circular surface nor a slanted surface, let alone a parabolic surface, but a cubic curved surface. Therefore, according to the Spring span, using the traditional design method to design the blanking length of each secondary spring, it is difficult to get the precise blanking length design value, which not only affects production efficiency, but also affects material utilization and economic benefits

However, due to the complex calculation of leaf spring deflection, gradual clamping stiffness and secondary spring surface shape in the gradual change process, it is also affected by the calculation of the equivalent thickness of the overlapping part, the clamping stiffness of the main spring and the composite clamping stiffness of the main and secondary springs. Constraints on key issues. According to the research data, there has been no design method for the blanking length of each piece of secondary spring for high-strength grade-1 gradient stiffness leaf springs at home and abroad.

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