It may differ depending on various situations, but if the material, wire diameter, coil mean diameter (inner diameter, outer diameter are also acceptable), free length, and the active number of coils of the compression springs change, what is the specified load in general?
(Example: SUS304-WPA, coil mean diameter φ14mm, specified height 80mm, wire diameter φ0.65mm, what will be the load when the effective number of coils is 10 and 15 respectively)
Spring Newbie, thank you for your question!
When the material, wire diameter, coil mean diameter, and free height are constant and only the number of active coils is increased or decreased, the repulsive force becomes weaker as the effective number of turns increases and becomes stronger as the effective number of turns decreases.
You can find the calculation formulas from here .
* SUS304（EQ to S30400 by ASTM, X5CrNi1810 by DIN, L-No6X5CrNi 18-9 by ISO ）
Thank you for your answer.
I also saw this at another other Q & A. Is the following correct?
The active number of coils: As the number of coils increases, the repulsive force becomes weaker.
Mean coil diameter: The larger the coil, the weaker the repulsive force is.
Wire diameter: The smaller the wire diameter, the weaker the repulsive force is.
Free height: The higher the spring is, the weaker the repulsive force is.
Specified height: The taller the spring is, the weaker the repulsive force is.
How about the repulsive force due to the difference in materials?
(SWC, SWPA, SWPB, SUS304-WPA, SUS304-WPB, SUP6)
* It would be easy for me to understand if you can write them it by % based on one of the materials.”
Dear Spring Newbie,
Free height: When measuring the load based on the specified height, the repulsive force becomes stronger as the free height increases. (Because the amount of deflection increases)
Specified height: When the free height is constant and the specified height is high, the repulsive force becomes weak.
With the same shape and load measurement point, the repulsive force due to different materials are as follows: SW〇〇 ＞ SUS〇〇. Since SW has a higher elastic modulus than SUS, the repulsive force is higher.
* SUS304（EQ to S30400 by ASTM, X5CrNi1810 by DIN, L-No6X5CrNi 18-9 by ISO ）
