19-09-2014, 02:57 PM
Abstracts: Rapid prototyping (RP) refers to a class of technology that can automatically construct physical models from computer aided design (CAD) data. Reduction of product development cycle time is major concern in industries for achieving competitive advantage. So, the focus of industries has shifted from traditional product development methodology to rapid fabrication techniques.The Fused deposition modeling (FDM) is a one of the rapid prototyping(RP) technology by which physical objects are created directly from CAD model using layer by layer deposition of extruded material. The quality of FDM produced parts is significantly affected by various parameters used in the process.In this present work three important process parameters of the FDM process such as layer thickness, part build orientation and raster width are consider. Their influence on two responses such as Tensile strength and Flexural strength of the test specimens are studied. The powerful Taguchi’s method is used for design of experiments because of it can be provide simplification of design plan and reduced the number of experiments runs. Specimens are prepared for Tensile test and Flexural test as per ASDM standards. The signal-to-noise (S/N) ratio is used to get the contribution of each parameter. The validity of process parameter and response is tested by using analysis of variance (ANOVA). Through this study not only can be optimal process parameter for the FDM process be obtain, but also the main process parameter that affect the quality of prototype can be found. At this end, regression analysis is carried out. The multi linear regression models are developed in order to predict Tensile and Flexural strength of test specimen. The experimental data and data obtained by regression equation is closely correlated which validated the models. After completing the experiments we have found that the mechanical properties of the test specimens is increase with increase in layer thickness and decrease in the part build orientation. The major reason for weak strength of FDM processed parts may be attributes to distortion within the layer or between the layers while building the parts due to temperature gradient.