In this study, Nylon 6 (PA6) was reinforced with glass fibers and molded using different injection parameters. The PA6 samples were then subjected to fatigue tests, and the results were processed to study (i) how the glass fibers affected the PA6 fatigue displacement and (ii) which injection parameters influenced the PA6 fatigue property. To do so, single-factor experimental designs were implemented in which the control factors were the glass-fiber percentage, the melt temperature, the hold pressure, the hold time, the injection pressure, and the injection time. Correlational analyses were used to predict the relationships between the control factors and fatigue results. A two-factor design was then applied to determine the two factors that influenced the PA6 fatigue displacement the most, with analysis of variance being used to determine how the factors affected the fatigue property. In this study of injection plastic, the glass-fiber percentage of PA6 composite was found to be the main factor that affected the fatigue displacement the most.

Three-dimensional (3D) printing is a method of additive manufacturing that involves creating objects by serial deposition for pre-production or production. After designing a 3D model with a CAD program, a processable file is customized to create a layered design, which is then printed. Although this technique costs more than traditional techniques, such as metal injection molding, metal 3D printing can significantly improve the production times of lightweight parts produced in small numbers. Furthermore, is improves flexibility, and is more able to produce complicated geometries that would not be possible with common methods, such as turning, milling or drilling. The fused deposition modeling technique uses a metal powder filament, which is pulled through a high-temperature extrusion nozzle, thus melting the material; after that, the printed parts are placed in the debinding station with a solvent to remove the wax from the powder. Finally, completed products are taken from the sinter furnace with inert gases. Depending on the material, different characteristics arise in the production process, and the produced parts manifest different mechanical properties. This paper describes some experiments performed on the fused deposition modeling method using stainless steel filaments, debinding Opeteon and a sinter furnace.