Spring technologies

Always up to date with the latest process expertise

Spring technologies

Our extensive expertise and capacity for innovation mean that we can meet your specific requirements for technical springs and stamped-bent parts of every kind. We do this using the latest process technologies, including winding, coiling, bending, rolling, spring end grinding and setting, as well as heat treatment and surface treatment methods such as shot peening, ceramic shot peening and deburring.

Our goal: to create compression springs, tension springs, torsion springs, bent wire parts, constant force springs, induction coils and stamped-bent parts to your requirements and the highest level of quality.

Winding

  • Use of CNC-controlled coiling machines
  • Rotating windings pins for optimized application of the spring ends
  • Highly flexible
  • Reduced setup times
  • Highest precision
  • 100% force testing
  • 100% geometry check during the manufacturing process

Coiling

  • Spring body coiled around a mandrel
  • Automatic CNC winding machines
  • Highest precision
  • Laser, camera check and ejection control
  • Dimensionally stable bends through tool-based contours
  • Cost-effective manufacturing processes for high volumes
  • 100% geometry check during the manufacturing process

 

Bending

  • CNC and stamping/bending machines
  • Highly flexible
  • Reduced setup times
  • Highest precision
  • Dimensionally stable bends through tool-based contours
  • Laser and camera checks

Rolling

  • CNC and stamping/bending machines
  • Highly flexible
  • Reduced setup times
  • Highest precision
  • Laser and camera checks
  • Dimensionally stable bends through tool-based contours
  • Cost-effective manufacturing processes for high volumes

Cold setting and 100% inspection

  • Use of automatic cold setting equipment
  • 100% inspection of spring forces
  • Different machine designs for different quality requirements (tolerances)
  • Multiple sorting of compression springs into separate classes
  • Grinding of the ends of compression springs with a wire diameter of 0.25 mm to 1.80 mm
  • Fully automatic loading and unloading
  • Product-based grinding technologies for grinding of all spring wires
  • Beating or milling of wire ends from 0.50 mm to 2.00 mm

Most wire springs are manufactured from high strength 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 life cycles and usable spring forces. Most of these influences can be removed with a heat treatment process adapted to the material, at the same producing an increase in the initial strength and in the elastic yield strength in the material.

We set the properties of the springs to their optimum values with defined heat treatments. We have a wide range of heat treatment systems in place, including convection, inert gas and vacuum furnaces.

We treat sensitive springs gently in a continuous furnace

 

Circulating air tempering

  • Relaxation of inserted bending stresses
  • Increase of the tensile strength of the primary material

 

Inert gas and vacuum annealing

  • Relaxation of inserted bending stresses
  • Increase of the tensile strength of the primary material
  • No discoloration of the surface
  • Surface without oxide layer

Shot peening is a manufacturing process used to increase the service life of the springs by introducing internal compressive stresses into the surface zones. The process compacts the surface of the spring.

The process of steel and ceramic shot peening can be used to deburr spring ends.

Electrical/chemical deburring processes

To improve surface topography and for deburring and rounding, we use both electrochemical and chemical deburring processes, enabling the deburring of areas of the spring that are hard to reach. During processing, the material is dissolved. This process is particularly suitable for challenging requirements in terms of the cleanliness of the parts.

 

Tumbling

Tumbling is method of surface treatment used to

  • Deburr spring elements
  • Rounding edges
  • Smooth and polished surfaces

 

Steel and ceramic shot peening

The process of steel and ceramic shot peening can be used to deburr spring ends.