What constitutes a rational disc spring design? Four core principles and stress control standards

In disc spring applications, "well-designed" is the fundamental prerequisite for ensuring reliable performance and long service life. What constitutes "well-designed"? It is not a vague concept, but a series of clear, quantifiable engineering principles. Jiangsu Sunzo Spring, leveraging its deep expertise in disc spring technology and guided by the "National Standard for Disc Springs", reveals the four core principles essential for high-reliability disc spring design.

1、Core stress control: the cornerstone of strength and stability

A reasonable design of the spring is first reflected in the precise control of the stress at the critical point, which is the key to prevent early failure.

Principle 1: Control σOM center stress

The stress (σOM) at the center layer of the disc spring's OM point must be controlled within 1400-1600 MPa. This value is achieved through high-quality materials, precise heat treatment, and advanced shot peening processes, serving as the core metric for evaluating the disc spring's overall performance.

Principle 2: Limit σⅠ edge tensile stress

The tensile stress (σⅠ) on the upper edge of the disc spring's inner diameter must not exceed 3000 MPa. This represents the safety threshold to prevent brittle fracture or cracking under high pressure.

2、Structural stability design: prevent "flipping" and dimensional instability

In addition to the stress, the rationality of the structural parameters is directly related to whether the disc spring can work normally.

Principle 3: Optimize the section modulus (h₀/t)

The ratio of the disc spring's free height to thickness (h₀/t) must be properly designed. If this ratio is too high, the disc spring will develop a' flange' during compression, causing its free height (H₀) to become unstable and resulting in abrupt changes in the characteristic curve, ultimately compromising its intended functionality.

3、Process adaptability: when the design exceeds the standard boundary

Principle 4: Pressure limiting process under super stress state

When the design parameters σOM or σⅠ of a disc spring exceed the specified standard limits, it enters a "stress exceeding" state. In such cases, standard "flattening" compression treatment cannot be applied, as this may cause damage. A specialized "pressure-limiting" process must be implemented to restrict the compression stroke, thereby preventing stress from surpassing the material's ultimate strength.

The value of Jiangsu Sunzo Spring: We provide not only products but also scientific design assurance. In our disc spring design process, every design undergoes rigorous stress verification and parameter optimization to ensure maximum performance while maintaining absolute reliability and stability, eliminating the risks of 'flanging' and 'over-stress' at the source.