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敏感元件波纹管的参数稳定性(亦称时间稳定性),反映了元件的几何参数与性能参数随着工作时间延续的变化程度。它比较直观地说明了元件性能的高低和质量的优劣。一般来讲,参数稳定性取决于元件的抗蠕变性能及残留应力的大小,它不仅和元件的材质、元件的使用条件有关,而且与元件的制造工艺有关。波纹管是用圆柱薄壁管经液压成型和整型等工序制成。其冷作硬化程度高,内应力较大。这种内应力的存在,不仅是元件各项参数不稳定的内因之一;而且也是产生应力裂纹、应力腐蚀以及季节开裂的根源。温度稳定处理(又称消除应力退火)就是消除内应力的常见工艺方法之一。
The parameter stability (also known as time stability) of the bellows of the sensitive components reflects the degree of change of the geometric parameters and performance parameters of the components as the working time continues. It is more intuitive to illustrate the level of component performance and quality advantages and disadvantages. In general, the parameter stability depends on the creep resistance of the component and the residual stress. It is not only related to the material of the component and the condition of the component, but also relates to the manufacturing process of the component. Bellows is a thin-walled tube by hydraulic forming and shaping and other processes made. The degree of cold hardening, high internal stress. The existence of such internal stress is not only one of the internal instability of the parameters of the components, but also the root cause of stress cracks, stress corrosion and seasonal cracking. Temperature stabilization (also known as stress relief annealing) is one of the common processes to eliminate internal stresses.