Unit volume deformation can double the original disc
springs is bigger, to absorb shock and dissipate energy, under load, the long-term impact throughout radial crack;
Disc spring is working on the border between saucer reed concave inner ring plane and end face, carrying maximum tensile stress, disc spring why failure?
Here are spring manufacturer for disc spring failure cause analysis: 1, processing to produce crack.
Disc spring by hot forging processing molding, high temperature quenching + tempering tempering treatment, shot peening processing surface, will appear in the manufacturing process of the disc spring internal micro cracks, cause stress concentration, in use process, if load will accelerate the disc spring fatigue failure and cracking.
2, heat treatment is not reasonable.
Disc spring heat treatment, conditioning treatment, due to improper tempering temperature and cooling rate after the tempering or any deviation (
Such as after tempering cooling speed is too slow)
To produce high temperature tempering brittleness;
Heat treatment of surface decarburization phenomenon, has a harmful effect on the fatigue life of the disc spring and worsen saucer reed elastic limit and fatigue life, to contribute to the formation of cracks.
3, due to the unreasonable material composition, composition segregation results in uneven performance of disc spring, for example, 60 si2mn as disc spring material, Si content is low, reduce the saucer reed yield strength, cause a embrittlement of the parts in advance, and even cracking;
P content on the high side, then adding steel brittleness tendency and composition segregation;
While the existence of sundry split the continuity of matrix, and become a crack sensitive area, especially when the distribution in the workpiece surface, easy to cause stress concentration, to stress corrosion cracking preferred channels.
4, long time use the resulting material embrittlement.
Materials used for long, disc spring internal organization to achieve even beyond its mechanical performance limit, causing embrittlement, premature fatigue failure.
5, stress corrosion.
Disc spring under tensile stress at work, when the disc spring loading, unloading residual tensile stress, the internal retained if saucer reed long-term work in acidic liquid or humidity larger environment, under the effect of tensile stress, the solution of hydrogen aggregation, adsorption on the surface defects such as holes, corrosion pit, reduce the adhesion strength of the surface energy, or atomic health, local stress concentration, when the crack nucleation work is greater than the crack tip stress intensity factor, which can lead to brittle fracture micro crack nucleation and propagation environment, the micro cracks appear, leading to premature disc spring fatigue failure.
6, using the environment make the saucer reed produces further embrittlement.
Disc spring working under high temperature or low temperature environment for a long time, its organizational change slowly, see further embrittlement.
The every kind of reasons cause the disc spring fatigue failure at work, bring losses to the production application, thus to explore the disc spring of the relationship between load and deformation are very has the application value, in light of the calculation formula of the disc spring are suitable for small and medium under the load of limitations, to explore the disc spring under large load of stress-strain relationship, it is concluded that the calculation formula of high precision is very necessary.
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