ECAD; Superplastic forming; Simple shear; Finite element modelling (FEM)

The present study focuses on aspects of the surface qualities of prototypes obtained by injection techniques. The surface finish and dimensional precision of parts obtained through these manufacturing processes is often highly important. Moreover, it is important to have an estimation of the average surface roughness in order to select the operation parameters adequately. Although there are a lot of different techniques for evaluating the surface roughness, one of the most commonly employed methods for characterising roughness involves assessment of surface roughness average by means of stylus instruments. Prototype manufacturing using two different systems of multijet injection technology was carried out, modifying the manufacturing conditions for obtaining the prototypes. After parts were obtained, an experimental study of effective roughness was done. Also, a comparative study using two injection systems with different accuracy was performed in order to evaluate the capability of these rapid prototyping techniques for manufacturing parts.