Process Chains in Microforming Technology Using Scaling Effects.

Cold formed micro parts with dimensions <1 mm show in some aspects characteristics due to scaling effects that can be positively used in process chains. Whereas aspect ratios in upsetting processes are limited to l₀/d₀<2 in the macro scale, a laser induced free-forming process generates droplet shaped pre-forms for consecutive calibrating processes, i.e. micro rotary swaging. Scale effects on establishing and shortening of process chains like free-form heading/rotary swaging/heat treatment are discussed. On the other hand a geometric scale-up approach in the macro range is described to overcome the specific handling problems of miniature parts. This is achieved by leaving the parts in a physical linkage during the processing steps. An effective application of linked micro parts requires intensive modeling and simulation work. [ABSTRACT FROM AUTHOR]