Permanent deformation of compression coil springs

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keyword: compressionsprings; grinding; permanentdeformation; sagging

Question Spring Newbie 2019/1/8(Tue) 14:24

Could I ask you a question about the sag (permanent deformation) of compression coil springs?

Material: SUS304WPB
Wire diameter: Φ3.0-3.6
Outer diameter 14-18 Terminals
Closed ends
Grinding aspect ratio 3
Expected load 800N.

Due to grinding, if a spring like this has small seating surfaces, will it deform faster?

Answer Tokai Spring 2019/1/8(Tue) 15:56

Spring Newbie, thank you for your contribution! Depending on the size of the ground seating surfaces, the sag (permanent deformation) does not become faster. However, with the dimensions stated, if H / D (aspect ratio) of 3 is maintained while the wire diameter is Φ3.6, the maximum working load is about 700N.
If the H / D is set to about 4, the design will provide a repulsive force of 800N within an appropriate deflection range.

* SUS304（EQ to S30400 by ASTM, X5CrNi1810 by DIN, L-No6X5CrNi 18-9 by ISO ）

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