Spring technologies

Spring technologies

Wire springs

From innovative product development to reliable processes for high-volume production with a high level of vertical integration.

Winding –- coiling – bending


  • Use of CNC-controlled coiling machines
  • With rotating windings pins for optimized application of the spring ends
  • Highly flexible
  • Reduced setup times
  • High precision
  • 100% inspection of the unstressed spring length and diameter if required


  • Spring body coiled around a mandrel
  • CNC coiling machines
  • High precision
  • Laser and camera checks


  • CNC and stamping/bending machines
  • Highly flexible
  • Reduced setup times
  • High precision
  • Laser and camera checks if required
  • 3D bent parts

Hot setting

Hot tensioning / hot setting

  • Minimized relaxation of the spring in operation through higher tensions and temperatures during the process than in the actual application
  • Springs tensioned during hot tensioning in templates or with spacing in "press shoes". The springs are heat treated in furnaces while in this state
  • In the hot setting process, the springs are heated in a furnace in the free state and quenched with coolant under presses to the required length

Cold setting

Cold setting and 100% inspection

  • Use of automatic cold setting equipment
  • Measuring ranges: From 2 N, to 100 N, to 1000 N
  • 100% inspection of spring lengths/forces, lengths/force deltas and spring rates
  • Load cells adjusted to the respective spring forces
  • Different machine designs for different quality requirements (tolerances)
  • Sorting of compression springs into separate classes

Spring end grinding

  • Grinding of larger wire diameters in a process in which the upper disc is moved down while the loading plate rotates continuously
  • Customized grinding technologies (machine and grinding disc qualities) for the grinding of patented drawn, oil-tempered and stainless steel wires and special alloys

Stress release

  • Wire springs are manufactured for the most part from spring tempered round wires and profiles. The winding or coiling of the spring introduces high internal bending stresses that have a negative impact on the spring properties in terms of service life and usable spring force. Most of these stresses can be removed with a stress release process adapted to the material, at the same time producing an increase in the initial strength and an increase in the elastic yield strength in the material.
  • We set the properties of the springs to their optimum values with defined stress release regimes. We have a wide range of heat treatment systems in place, including convection, inert gas and vacuum furnaces.
  • For special materials, for use for example in high-temperature applications, we can offer systems with temperatures of up to 1,350° C.

Steel and ceramic shot peening

Surface compacting

  • Shot-peening with steel balls of0.3 mm in diameter
  • Ceramic shot peening with glass beads from 150 to 250 microns in diameter
  • The process is used to introduce internal compressive stresses into the surface