Spring technologies

Winding –- coiling – bending

Winding

• 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

Coiling

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

Bending

• 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