Processing and manufacturing defects: The hidden killer of disc spring failure

Due to their unique thin-sheet and conical structure, disc springs impose extremely high requirements on the precision and stability of manufacturing processes. During production, even minor defects or imperfections at any stage may become potential failure risks during subsequent service, significantly compromising their performance and service life.

1、Origin and Prevention of Stamping Crack

Stamping is a critical process in disc spring manufacturing. Excessive pressure application during stamping, insufficient mold fit accuracy, or wear can easily lead to uneven thickness distribution, sharp burrs, or micro-cracks on the edges of disc springs. For instance, a specific disc spring model developed barely visible micro-cracks at the edges due to improper parameters during stamping. Under subsequent service conditions with alternating loads, these cracks rapidly expanded under repeated stress cycles, ultimately resulting in catastrophic fatigue fracture.

2、Hazards of grinding burns

Grinding processes aim to achieve optimal surface finish and dimensional accuracy. However, excessive grinding speeds, improper wheel selection, or insufficient coolant supply can cause instantaneous temperature spikes in the grinding zone, leading to surface burn damage. Such damage not only generates microscopic grinding cracks but also alters the metallographic structure of the material's surface layer. This results in significant hardness reduction and increased residual tensile stress, severely compromising surface strength. Consequently, these areas become vulnerable zones where fatigue cracks preferentially initiate and propagate.

3、Impact of Insufficient Dimensional Accuracy

The dimensional accuracy of disc springs serves as the foundation for their proper functionality. Thickness variations directly cause stress distribution imbalance, subjecting localized areas to excessive stress and premature yielding. Design deviations in cone angles significantly impact elastic characteristics and rated load capacity, resulting in substandard performance. Non-compliant flatness requirements generate additional bending moments during assembly and compression, potentially leading to spring fracture under unintended bending stress conditions.

To ensure the machining quality and long-term reliable operation of disc springs, professional process optimization and rigorous dimensional inspection are crucial. For customized machining process optimization solutions or high-precision dimensional inspection services, please contact our professional sales team for detailed consultation.