Research on 3D Printing Technology of Polylactic Acid

Abstract

Additive manufacturing technology(3D printing) as a rapid development of rapid prototyping technology in recent years. However, the surface quality and mechanical properties of the molded parts are worse than those of traditional material reduction manufacturing due to the special bottom-up processing and forming principle. In this paper, the performance of FDM parts is improved by studying the process parameters.  According to the actual research situation, this paper selected the filling density, printing speed, printing temperature, stratification direction for experimental research. Through orthogonal test and single factor method, the best strength combination is obtained as filling density 80%, printing speed 35mm/s, printing temperature 195℃. After range analysis, it is found that the filling density has the greatest influence on tensile strength, followed by printing speed and printing temperature. the lamination direction also has a significant influence on tensile strength.