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Analysis of the Influence of the Height Change of the Inner Cone of Disc Spring: The Change Law of the Pressing Force and Core Stress | Sunzo Technology

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Parametric Analysis of the Effect of the Height of the Inner Cone on the Mechanical Properties of the Disc Spring

In the design optimization of disc springs, understanding how individual parameter changes affect overall performance is critical. Jiangsu Sunzo Spring will analyze the specific impact of varying the inner cone height (free height h₀) on the spring's flattening force and core stress points, based on the technical principles of disc springs.

1、Core variation patterns

Assuming that all other parameters of the disc spring (material, thickness t, inner and outer diameters D/d, etc.) remain constant and it operates within the elastic range, when the height of the inner cone h₀ changes:

1. The variation of the flattening force (Pf) is proportional to h₀.

The law is that the flattening force increases linearly with the height of the inner cone. Specifically, when h₀ doubles, the flattening force Pf doubles accordingly.

Conclusion: The flatness stiffness (Pf / h₀) remains unchanged, which is consistent with the conclusion discussed before, and reflects the inherent regularity of the mechanical characteristics of the disc spring.

2. Variation of OM stress (σOM) under the same compression displacement

The results show that the stress σOM produced by the disc springs with different height of inner cone is the same when the same absolute compression displacement f is applied.

Significance: It means that for the same material, thickness and diameter of the disc spring series, if the expected working compression is the same, the load level of the disc spring at the key stress point is the same.

2、Engineering significance and application enlightenment

The analysis provides a clear guidance for the design and selection of disc spring.

1. The effective way to adjust the bearing capacity: If the bearing capacity of the disc spring is to be adjusted without changing the installation space (diameter) and material, changing the height of the inner cone h₀ is a direct and effective way. Increasing h₀ can linearly increase the maximum flattening force and working load.

2. The design of stroke and load: although increasing h₀ can increase the force value, it also increases the flattening displacement (stroke).

3. Simplification of stress control: For a given compression stroke, there is no need to worry about the key stress point exceeding the limit (within the elastic range) due to the selection of different heights of disc springs, which simplifies the stress verification of serialized product design.

3、Technical Practice of Three-Group Elasticity: Parametric Design and Precise Control

At Jiangsu Sunzo Spring, we provide not only standard disc springs but also advanced parametric design and analysis capabilities.

Performance prediction: We can accurately predict how the performance curve of the disc spring (force-displacement curve, stress distribution) will systematically shift when h₀ is changed, providing customers with multiple optional solutions.

Customized Development: To address specific spatial constraints and mechanical requirements, we can quickly customize disc springs with matching performance by adjusting key parameters such as h₀.

Quality control: During manufacturing, we rigorously control tolerances of critical dimensions such as h₀ to ensure batch product performance closely matches design specifications.

We are dedicated to helping clients understand the intrinsic relationship between disc spring performance and design parameters, transforming clear mechanical principles into precise, elastic solutions that meet complex engineering demands. Whether for standard product selection or in-depth customization, we provide technical support based on professional analysis.


SUNZO has it’s own researching and development team and test center, has participate in rule-making of the latest national industry standards and the international ISO standards for disc springs.

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