Optimization of Stereolithography Process Parameters for Part Strength using Taguchi Technique

Abstract — Rapid prototyping (RP) is an emerging technology that has been implemented in many spheres of industry – particularly in the area of new product development. Growth of this field has been rapid in recent years. Stereolithography (SL) is one of the most popular RP process used for rapid tooling applications. There are several process parameters contributing to the strength of SL product. The contribution of the identified parameters: i.e., layer thickness(Lt), Orientation(O) and hatch spacing (Hs)which are more significant factors contributing to the strength of an SL product. An attempt has been made in order to study and optimize these process parameters in order to maximize the part strength and also development of an empirical model which depicts the relationship between the process parameters and part strength through taguchi technique and Analysis of variance. The detailed study of the effects of these parameters was carried out over the SLA parts and the data were analyzed by quantitative methods. The optimum levels of the parameter contributing to higher tensile / impact and flexural strength of the part are the end results of the paper, which is very useful information for machine designers as well as RP machine users. The results obtained were utilized to select the main influencing parameters and the best parameter settings for yielding the optimum objectives