Two states of spring operation:
Springs can be divided into static springs and dynamic springs according to their operating conditions. Static springs refer to springs that have a limited number of vibrations during service, such as safety valve springs, spring testing machines, spring washers, weighing pan springs, constant load springs, mechanical springs, watch hair springs, etc. .
Dynamic springs refer to springs that have more than 1×106 vibrations during the service period, such as engine valve springs, vehicle suspension springs, anti-vibration springs, coupling springs, elevator buffer springs, etc.
Tensile strength and stability are mainly considered when selecting static spring materials, and fatigue, relaxation and resonance performance are mainly considered when selecting materials for dynamic springs.
Springs can be divided into three states according to the load conditions: light load, general load and heavy load. Light load refers to springs that bear static stress, low stress, and small deformation, such as springs for safety devices and springs for vibration absorption. Design The service life is 103~104 times.
General load refers to a common spring with a design life of 105~106 times and a vibration frequency of 300 times/min. Within the allowable stress range, the life is guaranteed 1×106 times. The lower the load stress, the longer the life.
Heavy load refers to springs that work for a long time and frequently vibrate. For example, valve springs, air hammers, presses, and hydraulic controller springs have high loads, often used at about 10% below the allowable stress, and their service life is greater than 1×106 Times, usually 107 times.