English Views: 72 Author: Site Editor Publish Time: 2026-03-11 Origin: Site
7 Critical Dimensions of Disc Spring Failure That 90% of Engineers Easily Overlook!
Disc springs (abbreviated as "disc springs"), metal elastic components with truncated cone shapes, are widely used in high-end manufacturing sectors such as automotive, rail transit, and energy equipment due to their "compact size and high load-bearing capacity." They serve critical funtions like elastic support and shock absorption. Though seemingly simple, these springs act as "invisible guardians" for stable equipment operation. Failure may result in equipment shutdown and precision loss at best, or even cause safety incidents like leaks and fractures at worst, leading to significant losses.
Industry surveys reveal that 76.3% of disc spring failures in China over the past three years resulted from overlooking critical factors, accounting for 37% of sealing or support system failures. This has become a weak link that hinders continuous equipment operation. By analyzing industry practices and case studies, we have identified seven key dimensions of disc spring failures, providing a comprehensive breakdown of the issues to help you avoid potential risks.
The material is the foundation of disc spring performance, any material defect may become the failure "time bomb", the common defects mainly include three categories.
Ø Improper material selection is the most common issue: ordinary spring steel under high-temperature conditions leads to elastic attenuation, ordinary carbon steel in corrosive environments is prone to rusting, while high-end stainless steel at room temperature results in cost waste; thin springs using materials with insufficient toughness are susceptible to stamping fractures.
Ø Material defects are equally critical: Some manufacturers use inferior steel or substitute stamped blanks with bar materials, resulting in internal porosity and cracks in disc springs, which lead to stress concentration and brittle fracture. Non-compliant material delivery conditions, such as failure to anneal, cause uneven hardness and impair processing performance.
Ø Improper heat treatment directly affects mechanical properties: deviations in quenching and tempering parameters may result in excessive hardness (increased brittleness) or insufficient hardness (decreased elasticity), while excessive decarburization reduces fatigue strength.
Prevention and control recommendations: Select precise models according to operating conditions. Prioritize spring steel such as 60Si2MnA for conventional conditions, use heat-resistant steel for high-temperature applications, and select corrosion-resistant alloys for corrosive environments. Strictly control material inspection, standardize heat treatment processes, and regulate hardness and decarburization layer depth.
The failure of disc spring is mainly caused by design error, and its nonlinear elastic characteristics require high precision in design, which mainly focuses on three points.
Ø Design errors in geometric parameters: A height-to-diameter ratio (h₀/t) exceeding 1.5 without anti-stability measures may cause buckling, while a ratio deviating from 1.8-4.0 can lead to uneven stress distribution. Failure to chamfer or deburring edges results in stress concentration, which may become a source of fatigue cracks.
Ø Improper combination stacking design: Ignoring the interplate friction coefficient may result in misalignment loading and stacking cracking. A special vehicle disc spring experienced excessive single-plate load due to incorrect combination calculation, leading to multiple plate fractures within a short period.
Ø Load-deflection deviation: Failure to specify actual operating parameters may result in overloading or insufficient elasticity due to empirical design; omission of preloading deformation could accelerate fatigue crack initiation; lack of finite element simulation optimization leads to excessive discrepancies between theoretical and practical values.
Prevention and control recommendations: Design in accordance with the GB/T 1972 standard, with h₀/t>1.3 and guide components to prevent instability; optimize the combination method and conduct simulation analysis to accurately calculate loads and deflections, reserving a safety factor.
When the materials and design are defect-free, the manufacturing process negligence is still the main cause of failure, and the deviation of key process will lay hidden dangers.
Ø Forming process defects: Insufficient hardness of cold forming dies for thin springs may result in burrs, while medium-thick springs without corresponding warm/hot forming processes can lead to dimensional deviations or internal defects. Inadequate annealing after cold forming may cause residual internal stresses, leading to deformation.
Ø Surface treatment is not adequate: Omitting shot peening will shorten the fatigue life, uneven coating may cause corrosion, and failure to apply Dacromet treatment in corrosive environments will accelerate corrosion; electroplating of variable load disc springs without degassing may induce hydrogen embrittlement.
Ø Improper standing treatment: omission or non-compliance (flattening time ≥12h, frequency ≥5 times) may result in unstable free height and elastic attenuation of the disc spring.
Prevention and control recommendations: Adopt corresponding forming processes based on thickness, strictly control die accuracy and annealing procedures; select surface treatment methods as required, standardize post-processing, and ensure process traceability.
More than 30% of disc spring failures are caused by improper installation, and errors in centering and pre-tightening can disrupt the stress state.
Ø The central deviation: excessive clearance between the disc spring and the guide component may cause uneven force distribution and local overload leading to fracture; non-vertical installation generates additional bending moment, accelerating fatigue.
Ø Premature tension loss: Excessive tension causes plastic deformation, while insufficient tension leads to equipment loosening, vibration, and accelerated wear. A deviation of just a few millimeters between the pre-tightening height and the design specifications may result in fracture.
Ø Incorrect installation method: Reversed assembly causes sudden load surge, surface contaminants induce stress concentration, and missing auxiliary shock absorbers intensifies impact.
Prevention and control recommendations: Clean the installation surface, strictly control the guide clearance, precisely regulate the preload force, standardize the assembly method, and ensure the auxiliary components are properly positioned.
High temperature and corrosion will cause the disc spring to be eroded chronically, and the failure is hidden and difficult to be found at the initial stage.
Ø High temperature environment: it will lead to the decrease of elastic modulus,creep and stress relaxation,free height reduction,load reduction,accelerating oxidation wear.
Ø Corrosive environments such as humid, acidic, alkaline, and seawater can induce corrosion, stress corrosion cracking, or hydrogen embrittlement, with hydrogen embrittlement and hydrogen embrittlement-fatigue synergistic failure accounting for a significant proportion.
Ø Vibration and dust: High-frequency vibration aggravates fatigue damage, while dust impurities increase friction and accelerate corrosion.
Preventive measures: Select equipment types based on environmental conditions and implement protective measures. Conduct regular inspections under high-temperature and vibration conditions. Ensure proper equipment sealing. Hydrogen-sensitive disc springs require dehydrogenation treatment.
Fatigue failure is the most common form of disc spring, accounting for more than 40% of the failure cases. It develops gradually, and it takes a certain period from crack initiation to fracture.
Ø The core mechanism is that the stress concentration area of the microcrack will be expanded with the load cycle and eventually fracture, and the fatigue source is mostly concentrated in the tensile area of the upper and lower surface.
Ø The factors that affect the fatigue life are: the material process, improper design and installation will reduce the fatigue limit, high frequency alternating load and high temperature will shorten the fatigue life; the disc spring has unlimited life and can bear more than 2×10⁶ load cycles.
Ø Typical features: The fracture surface exhibits shell-like fatigue cracks, indicating brittle fracture; a disc spring from a petrochemical company fractured after 18 months of long-term alternating loads, leading to leakage.
Prevention and control recommendations: Optimize design processes to reduce stress concentration, control operational loads, conduct regular non-destructive testing, and replace components periodically according to fatigue life specifications.
Neglecting post-maintenance is tantamount to abandoning the last line of defense, with the primary issues concentrated in three aspects.
Ø Regular inspection is lacking: No detection mechanism has been established, which prevents timely identification of potential hazards such as elastic attenuation, corrosion, and cracks. Minor issues may deteriorate and lead to failure.
Ø Improper lubrication: Failure to add lubricant regularly or using unsuitable lubricants can increase wear and accelerate fatigue. Applying a dry MoS₂ coating to stacked disc springs can reduce wear.
Ø Non-compliant replacement and storage practices: Replacing with non-homologous disc springs or inadequate moisture and dust protection during storage may leave potential hazards; batch usage without re-inspection may result in batch-specific issues.
Prevention and control recommendations: Establish a regular testing mechanism (routine every 6-12 months, severe every 3 months), regularly replace lubricants, and standardize the replacement and storage procedures.
The failure of disc spring is the result of the joint action of seven dimensions: material, design, manufacture, installation, working condition, fatigue and maintenance.
Engineers must accurately grasp the core requirements across all dimensions, while enterprises need to establish a full lifecycle management system, standardize processes, and strengthen inspections to reduce failures, minimize equipment downtime, and mitigate safety risks. Although disc springs are small in size, their impact is significant. Mastering these 7 dimensions can ensure the safety of equipment.
