1. Why does the stainless steel spring appear "lack of elasticity"
(1) The design and manufacturing parameters of non-standard springs are unreasonable: only pay attention to the parameters such as outer diameter, inner diameter and length, and often ignore the size of the wire rod cross-sectional area and pitch, resulting in insufficient elasticity;
(2) The selection of standard springs is unreasonable: due to the low price of the drawings, the lighter load type is selected, and it cannot bear the heavier load, resulting in insufficient spring force feeling;
(3) The quality grade of the stainless steel spring is wrong: unintentional or unintentional use of ordinary springs as high-quality springs or imported springs leads to insufficient spring force feeling;
(4) If the spring used exceeds the specified temperature, the elasticity will decrease or even lose its elasticity;
(5) The stainless steel spring wire itself is soft, or the quenching temperature of the spring is low or the holding time is not long enough, or the tempering temperature is too high, and the time after the spring is formed is long, resulting in insufficient tensile and compressive strength and insufficient elasticity in the true sense. .
2. Why does the spring break?
(1) When the mandrel is too small or the spring is placed horizontally, the spring and mandrel are worn and broken;
(2) When the mandrel is too small, the assembly surface is uneven and the parallelism of the positioning surfaces at both ends is poor, the spring will be compressed and twisted, causing local high-pressure fracture;
(3) The mandrel is too short, and there is no chamfering at the end, resulting in friction and wear of the spring and the mandrel, breaking;
(4) The use of foreign objects between the spring coil and the spring coil reduces the actual effective number of coils, resulting in high stress and breakage;
(5) Use springs in series to bend more than the length of the mandrel or counterbore, or due to small differences in the spring itself, so that people with lighter loads can withstand greater compression and fracture;
(6) The use of springs in series produces high-efficiency stresses that break the springs;
(7) The stainless steel spring material is not uniform, or the content of impurities exceeds the standard, resulting in stress concentration fracture;