What are the operating states of the pressure spring?
The pressure spring can be divided into a static spring and a dynamic spring depending on the operating state. Static springs refer to springs with limited number of vibrations during service, such as safety valve springs, spring washers, weighing pan springs, fixed load springs, mechanical springs, watch springs, etc.
Dynamic spring refers to springs with a frequency of more than 1×106 times during service, such as engine valve springs, vehicle suspension springs, anti-vibration springs, coupling springs, elevator buffer springs, etc. The tensile spring strength and stability are mainly considered in the selection of static springs. The dynamic spring selection mainly considers fatigue, relaxation and resonance performance.
According to the load condition, the spring can be divided into three states: light load, general load and heavy load. Light load refers to a spring that is subjected to static stress, has low stress, and has a small amount of deformation, such as a spring for a safety device, a spring for absorbing vibration, and the like. The design life is 103 to 104 times.
The general load refers to a common spring that is designed to have a design life of 105 to 106 times and is used at 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.
The heavy load of the pressure spring refers to a spring that operates for a long time and vibrates frequently. Such as valve springs, air hammers, presses, hydraulic controller springs, the load is higher, often used at less than 10% of the allowable stress, the service life is greater than 1 × 106 times, usually 107 times the cross-sectional shape of the spring steel wire It is round, but also has the shape of rectangular, square, oval, etc. The finished steel wire is usually delivered in one roll, and it is delivered in a straight line.
Pressure springs are used in different environments and have different special requirements for steel wire. For example, springs operating in corrosive media require good corrosion resistance; springs in precision instruments require long-term stability and sensitivity; springs in high temperature environments require adequate elastic and creep resistance.