Design And Study Of Deposition Modeling System Of Metals

Direct metal manufacturing technology is a modern manufacturing method based on additive manufacturing. Some kinds of this technology that have been developed nowadays such as SLS, EBM and LENS have disadvantages including that the manufacturing equipments are expensive and the production cost is high, preventing the technology from mass application, as well as it is difficult to model some reactive metals by these methods. A deposition modeling system of metals is present according to these problems, combining the direct metal manufacturing with FDM method, aimed at decreasing the production cost and exploring a new method that is able to achieve direct modeling of metals, expanding the application area of the direct metal manufacturing.The material of experiment is Sn alloy and the modeling system use air pressure to realize the extrusion of the melt. Compared to the metal wire extrusion, this method better stabilize the deposition modeling of the melt. The deposition modeling system consists of melt-feeding system, motion control system, temperature control system and gas circuit system, solution and principle of design of these partial system are discussed, the organization structure and function of control program is also introduced. A brief finite element analysis of temperature distribution of the storing chamber and the action chamber is completed to get the working temperature setting principle of the storing chamber and the action chamber with the effect of the melt temperature on viscosity and surface tension as well as the effect of these two parameters on the modeling quality.Modeling experiment consists of line experiment, shape experiment and plane experiment. Effect of moving speed on width of modeling line is explored. Capacity of the modeling system to keep the shape accuracy and size accuracy is shown. Modeling result of plane experiment by different plane scanning mode is also explored. According to the analysis of the experiment result, disadvantages of system design are discussed and solutions of these disadvantages are shown.