Classification of size effects and similarity evaluating method in micro forming

Micro size effects are the particular phenomena in metal micro forming. Therefore, it is the point of the further research on micro-forming processing and theories. The experiential formulas and deformation theories of the conventional forming can be adopted to the micro-forming processing, on condition that the micro size effects are classified as micro size effects on material constitution and micro size effects on processing condition. On the basis of theory of similarity, a new concept, similarity precision is defined as similarity mete-wand of micro size effects. The similarity precision of two kinds of micro size effects above is demonstrated by adopting data of references, and application from conventional forming to micro forming is illustrated in terms of these methods of classifying and evaluating micro size effects.