Springs as such are an item that is used and necessary for most all mechanical appliances and products. They come in different construction which differs by dimension and structure as well as material used in their making. One of these types of springs used extensively is called the die springs. Springs form the basic item that generates the pressure aspect of these appliances.
Types of Springs in General
Springs can be grouped under three main categories, depending on their end use and which would lead to the difference in their construction as well as physical properties.
- The Engineered metal die springs: This type of die springs is the most general of the lot and is used in appliances where there is a need for pressure to increase based on the compression factor. The degree of precision is very critical in these groups of die springs.
- Urethane springs: Appliances where the traditional spring design would not be suitable like appliance to construct products with curves. In such appliances Urethane springs is necessary.
- Gas springs: Places where there is need for high pressure which go beyond that which die springs can provide, this third group of springs are used called gas springs. The pressure curve that such springs offer is flatter than that provided by die springs, and it remains so all through the compression curve.
To Define Die Springs
It is a spring that is supposed to provide a fixed pressure when it is compressed. The reliability and consistence factor of this pressure that die springs would exert when compressed is required to be very precise. It therefore is evident that the precision properties of die springs are very important in its application process.
Primary Function of Die Springs
In an example of the punch appliance that is used to perforate a certain surface, and in which die springs are extensively used, the main function is to make sure the target surface does not move off. Die springs is what holds the material surface due the force it exerts while it remains in compressed state. These forces are well calculated and pre-determined depending on the material whose surface has to be perforated. For standardisation, the material is taken as mild steel which has a shear pressure of 50,000 lb psi. It is evident that the pressure required to perforate would also depend on the distance of travel of the punch. The die springs compression factor therefore would be related to this issue as also the length of the die springs. Punch tools comprise of all three types of sprigs that has been mentioned above. The punch tool function itself requires high degree of precision and speed.
Classification of Die Springs
Die springs themselves comes in four grades, based on their strength. Die springs follow a colour sequence to differentiate this group based on their strength. It therefore is evident that when selecting die springs for manufacture of products there are a lot of intricate details that needs to be borne in mind.
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