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Compression Springs


Compression Springs

Compression springs expand when they are compressed. The enlargement of the outside diameter under load deltaDA in mm is calculated with solid height LbI and free bearing of the spring ends:    

  • deltaDa= 0.1*m²-0.8md-0.2d²/Dm 
  • m=Lo-d/if for springs with squared and ground ends 
  • m=Lo-2.5d/if for springs with unsquared, unground ends

Spring setting refers to a compression spring which after being compressed for the first time does not return to its original favourable length. This means that after setting, the material elasticity is inadequate to carry the load of the spring. The load the spring produces will be at a lower height and possibly less than required.

Our Compression Springs product range comprises Die Springs according to DIN & ISO, Conical Springs and Compression Ceramic Springs.


Compression Spring Characteristics

  • round, flat-oval, rectangular

 Compression Spring Material

  • EN 10270-1 patented drawn unalloyed music wire (spring steel)
  • EN 10270-2 oil hardened and tempered music wire (spring steel)
  • EN 10270-3 stainless spring steel wire

Other materials like Inconel, Incoloy HT800, copper beryllum and spring bronze are available on request.


Surfaces

  • Compression springs made of the material EN 10270-1 spring steel are oiled
  • Compression springs mades of the material EN 10270-3 are dry


winding direction

The standard winding direction of compression springs is right hand winding. This means that if you look through the spring axis, the winding of a spring wound to the right moves away clockwise.

 

 Abbreviation

Designation
 D  Wire / Bar diameter
 Da  Outer diameter
 Di  Inner diameter
 D(m)  Mean diameter
 nt  Total number of coils
 L0  Length of unloaded spring
 L1  Spring length at load F1
 L2  Spring length at load F2
 Lc  Solid height
 Ln  Minimal spring length allowed
 c (N/mm)  Spring rate
 S  Spring deflection
 Sh  Working deflection
 e1  Deviation from parallelism of   generating line
 e2  Deviation from parallelism of ground ends
 Dd  Mandrel diameter
 Dh  Core diameter
 tx  Tension at load x


Download our free calculation program, to calculate the expansion of compression springs.

Service Life

The actual service life of a compression spring depends, among other things, on the spring deflection between the two compression points and their position relative to the spring length. Thus, the service life will differ for each spring.

Contact us for help with the design and calculation of your application problem.

Compression Spring Applications

  • Mechanical engineering
  • Automotive
  • Electrical engineering
  • Medical technology