Method for designing blanking lengths of auxiliary springs of high-strength first-grade plate spring having gradually changing stiffness

Abstract

The invention relates to a method for designing blanking lengths of auxiliary springs of a high-strength first-grade plate spring having gradually changing stiffness and belongs to the technical field of suspension steel plate springs. The blanking lengths of auxiliary springs can be accurately designed through curved-surface microelements and superposing calculation on the basis of auxiliary spring initial tangent arc height design and first-auxiliary-spring initial curved-surface shape calculation according to structure parameters and elasticity modulus of main springs and the auxiliary springs, initial tangent arc heights of the main springs and beginning contact loads. It can be known through a prototype blanking processing test that the established method for designing the blanking lengths of the auxiliary springs of the high-strength first-grade plate spring having gradually changing stiffness is correct and lays an important technical base. By utilizing the method, blanking length design values of the auxiliary springs can be accurately obtained, the material saving rate can be improved, a processing technology can be improved, and the production efficiency can be improved. In addition, the design and testing expenses can be reduced, and the product development speed can be improved.

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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