Design And Process Research Of Three-Dimensional Metal Casting Equipment

The three-dimensional metal stacking technology is a three-dimensional forming technology based on additive manufacturing technology.At present,the production of more complicated box parts in small and medium-sized enterprises is basically achieved by traditional metal casting methods.The traditional metal casting has the problems of rough process,coarse grain structure of the formed workpiece,poor performance,and harsh working environment.At present,the process technology is relatively mature in additive manufacturing technologies,such as direct metal deposition(DMD),electron beam melting technology(EBM),layered solid manufacturing technology(LOM),etc.There are complex processes or high requirements for raw material processing,the cost is too large,and the slow forming speed,so on has not been widely used in various fields.The three-dimensional metal stacking technology proposed in this paper can solve the above problems,stacking molded parts with excellent performance and faster forming speed.At present,the most common raw materials used in additive manufacturing technologies are filaments and powders.The shape of the metal materials used in the three-dimensional stacking technology can be small pieces,small particles or powders.There are various types of materials available to enhance the additive manufacturing technology Scope of application.The main work of this study has the following aspects.First,discuss and design the structure of the three-dimensional motion platform,hardware and software design to build the platform.Secondly,the three-dimensional stacking and casting equipment was comprehensively verified through three aspects,including verifying whether each module is working properly,testing the software,verifying that each function of the host computer can set parameters normally,and controlling each module.Then,the forming ability of the three-dimensional stacking equipment was tested.Using low-temperature metal tin as the molding material,cylindrical and square parts were stacked respectively,which verified the forming ability of the stacking equipment.Then,by simulating the falling process of the molten metal,comparing the falling process of the molten metal under different pressures,an optimal pressure scheme is selected,and the speed and temperature change of the molten metal falling under this pressure state are simulated.And the speed change to explain the reason of the shape change during the drop of the molten metal,and to guide the improvement of the forming quality of the stacked casting samples.Finally,the three-dimensional stacking equipment was used to prepare samples under the optimal pressure.The microstructure analysis of the samples prepared by traditional casting and the three-dimensional stacking equipment showed that the three-dimensional stacking can refine the grains.To improve the performance of metal alloys.The reason is that the molten metal is refined into liquid columns and droplets by spraying during the falling of the molten metal,which increases the heat dissipation area of the molten metal and accelerates solidification.The molten metal rapidly solidifies and its performance is greatly improved.