The Research And Design Of Feed System In The FDM Rapid Prototyping

Rapid prototyping technology is a new technology in the 21 st century, which is originated in the 1980 s, it is known as 3D printing technology. Rapid prototyping technology is quickly accepted with its integration of design and manufacture. Fused deposition rapid modeling(FDM) is a desktop 3D printing technology, because its small size, easy to carry and to operate it. In recent years, desktop 3D printing technology become increasingly popular, and FDM has the largest market share in it.In fused deposition techniques, the feed system is the main hardware systems, including wire feed system and printing nozzle system. Wire feed system is responsible for pulling and pushing filament, printing nozzle system is responsible for the melting and extrusion molding.This paper firstly analyzes the various factors that influence driving force in the wire feed system. Such as the clamping device to the driving wheels. Combination of theoretical research, the wire feed system design ideas and design solutions are proposed. It relies on the supercharged principle of V-shaped wedge wheels to enhance the positive pressure between the drive roller, to improve the overall driving force for the wire feed system. Meanwhile, using spring adjustable clamping device to achieve the same machine to print different wire diameters, so it can meet more demand in the printing.Secondly, in the design of printing nozzle systems, because nozzle must meet the flow and extrusion of the filament, so this part discusses some rheological properties of polymers and heat transfer theory firstly. Then combined with theoretical analysis and designed the flow channel and cooling module. The cooling module is mainly to distinct the wire melting region and unfused area, to avoid filament melting transition zone is too long, so it can resolve the jamming phenomenon in the nozzle.In the different design part of feed system, we have done the theoretical simulation and experimental verification. The aim is to verify the reasonableness of the design. Currently, the driving force has been greatly improved, and it can print different diameter of the filament to meet the needs of multi-printing. Printing nozzle system also solved the congestion problems, and also avoid the melt exudation phenomenon during printing process, thus ensuring the printing quality.