Abstract:

To understand the influence of ultrasonic vibration on the mechanical properties of fused deposition molded （FDM） products and the correlation between various variables， an ultrasonic vibration system was added to the original fused deposition molding equipment， and the fused deposition molding process was studied through combining a single factor experiment method with a quadratic regression orthogonal rotation combination experiment. In this study， the printing shell thickness， filling density and ultrasonic power were taken as research objects. The results indicated that ultrasonic vibration power generated a great influence on the tensile properties of materials. Under the same conditions， the materials achieved an increase in tensile properties by 13.8 % after ultrasonic treatment. Through response surface analysis and variance analysis， it is concluded that the above three factors and the interaction between shell thickness and packing density exhibited the most significant influence on tensile properties. The optimum technological parameters were determined to be a shell thickness of 1.2 mm， a packing density of 90 %， and an ultrasonic power of 40 W. The quadratic regression model of shell thickness， packing density and ultrasonic power was established using the test data， and the reliability of the regression model was tested. The obtained results indicated that the regression model was reliable and could be used to predict the optimized processing conditions of the tensile test.

Key words: quadratic regression orthogonal rotation combination design, supersonic vibration, fused deposition modeling