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load
extra light
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load
light
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ISO 10243 standard states the
following parameters for rectagular wire compression springs:
D: housing diameter (or external diameter)
d: spring-guide pin diameter (or internal diameter)
Lo: length of the spring at rest (or free length)
R: load, in Newton, necessary to deflect the spring by 1 mm (1 Newton = 0.102 Kg)
The standard also gives the maximum total working stroke permissible for
each spring, the tolerances for the free length and the identifying color
for each rate.
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load
medium
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load
heavy
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load
extra
heavy
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Super
heavy
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load
super
heavy
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Spring selection
Selection of springs is facilitated by te following tables in our catalogue,
in which two different working deflection hypotesis are shown, plus the
deflection to solid. The following table summarizes the percentage of
deflection calculated for each series
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Series
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Load
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Deflection
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Max Deflection
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Spring to solid
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Bordignon
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1L
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Extra light
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35%
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50%
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Approx. 60%
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ISO 10243
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1S
|
Light
|
30%
|
40%
|
Approx. 50%
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ISO 10243
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2S
|
Medium
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25%
|
37,5%
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Approx. 45%
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ISO 10243
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3S
|
Heavy
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20%
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30%
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Approx.40%
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ISO 10243
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4S
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Extra heavy
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17%
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25%
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Approx. 35%
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Bordignon
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5S
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Super Heavy
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10%
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15%
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Approx. 20%
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When selecting and using the
springs we recommend:
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- Select the lightest and longest springs working requirements
allow
- Operating travel must never exceed the max deflection
indicated in the catalogue. Check ths too when the die is sharpened.
- Preload each spring in the assembled tool at least by 5% of the
free length, with a minimum of 2 mm.
- Provide an even base for each spring.
- Provide proper guidance to avoid buckling.
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