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What are the precautions for valve spring using?
by：Yongqiang
2020-11-16
Valve spring decided in the valve opening pressure and valve stroke and the stability of the seal under the closed position, if the spring out of the question, that the valve is difficult to operate in normal.
Then we will to summarize the causes of failure of the valve spring, as everyone in the later operation can also pay attention to and avoid.
we usually causes of failure of the valve spring is frequent summarized below:
1, the high pressure - - - Spring on the load according to the form of the external force can be divided into static load, impact load and shock load, most spring failure reason is caused due to the large deformation and high load caused by high stress. High stress is only applicable to the static load on the spring, low stress fatigue life is longer than the other.
2, hydrogen embrittlement - - Spring after the plating or pickling, without proper hydrogen treatment, will cause the spring steel by brittle failure, but non-ferrous metal valve spring is not affected by this. In plating solution for the electrolysis of water molecules and is always more or less the existence of a certain number of hydrogen ions, part of the hydrogen ions to form hydrogen gas overflow, part in the state of the hydrogen atoms into coating and metal in the body, make body and coating of metal toughness drops and crisp, this is hydrogen embrittlement. So should be in the acid treatment of electroplating or oven or resistance furnace to hydrogen treatment, according to the size of the spring and the thickness of the coating to determine a moderate and time, in the normal temperature of the choices in the 150 - 250 degrees Celsius, heat preservation time 0. 5 - 5 hours.
3, severe bending and gap - - - Stretch, twist and flat spring produce sharp, flat springs gap or scratches can lead to high stress concentration, caused by the failure, therefore, the bending radius should be as large as possible, and to avoid a mark.
- 4, and fatigue - - - Spring repeated deformation, especially when more than 106 cycles, even moderate stress, can also cause fatigue damage. When operating conditions demanding, should use low stress. Should improve the fatigue resistance of spring, under the condition of reasonable selection, shot peening not only make spring is bright and clean surface, but also can improve the fatigue resistance of spring, prolong the service life of spring, alleviates the decarburization on the surface of the block, even small hole, indentation, cracks and other defects. Shot peening can make tiny plastic surface, residual stress produced by can offset part of the spring produced during the repeated load tensile stress in the future, and the tensile stress is the root causes of the crack.
Look at the trends, both economic and consumer, for indications on your Dongguan Yongqiang spring hardware Co.,Ltd.'s staying power.
Dongguan Yongqiang spring hardware Co.,Ltd. is proud to be recognized as some of the most important and influential providers for global customers.Visit us at Yongqiang Spring Hardware.
If something seems too good to be true, then it can be a , which provides leaf spring hardware value over its cost.
we usually causes of failure of the valve spring is frequent summarized below:
1, the high pressure - - - Spring on the load according to the form of the external force can be divided into static load, impact load and shock load, most spring failure reason is caused due to the large deformation and high load caused by high stress. High stress is only applicable to the static load on the spring, low stress fatigue life is longer than the other.
2, hydrogen embrittlement - - Spring after the plating or pickling, without proper hydrogen treatment, will cause the spring steel by brittle failure, but non-ferrous metal valve spring is not affected by this. In plating solution for the electrolysis of water molecules and is always more or less the existence of a certain number of hydrogen ions, part of the hydrogen ions to form hydrogen gas overflow, part in the state of the hydrogen atoms into coating and metal in the body, make body and coating of metal toughness drops and crisp, this is hydrogen embrittlement. So should be in the acid treatment of electroplating or oven or resistance furnace to hydrogen treatment, according to the size of the spring and the thickness of the coating to determine a moderate and time, in the normal temperature of the choices in the 150 - 250 degrees Celsius, heat preservation time 0. 5 - 5 hours.
3, severe bending and gap - - - Stretch, twist and flat spring produce sharp, flat springs gap or scratches can lead to high stress concentration, caused by the failure, therefore, the bending radius should be as large as possible, and to avoid a mark.
- 4, and fatigue - - - Spring repeated deformation, especially when more than 106 cycles, even moderate stress, can also cause fatigue damage. When operating conditions demanding, should use low stress. Should improve the fatigue resistance of spring, under the condition of reasonable selection, shot peening not only make spring is bright and clean surface, but also can improve the fatigue resistance of spring, prolong the service life of spring, alleviates the decarburization on the surface of the block, even small hole, indentation, cracks and other defects. Shot peening can make tiny plastic surface, residual stress produced by can offset part of the spring produced during the repeated load tensile stress in the future, and the tensile stress is the root causes of the crack.
Look at the trends, both economic and consumer, for indications on your Dongguan Yongqiang spring hardware Co.,Ltd.'s staying power.
Dongguan Yongqiang spring hardware Co.,Ltd. is proud to be recognized as some of the most important and influential providers for global customers.Visit us at Yongqiang Spring Hardware.
If something seems too good to be true, then it can be a , which provides leaf spring hardware value over its cost.
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