Study On The Extrusion Principle And Device Of Carbon Fiber Composite Material For 3D Printing

Carbon fiber composite material is a new composite material,which has an advantage in the field having strict requirements like density,stiffness,weigh,fatigue properties.But the complex process,inefficiency,high cost,demand of mold precision,and also not forming a complex model,are restricting carbon fiber material from being applied at most.Because of the rapid prototyping characteristics,3D printing technology has integral forming and no limited by the complexity of model features.Therefore,carbon fiber composite material combined with 3D printing technology for industrial applications,can simultaneously take advantage of rapid prototyping and excellent material properties,leading broad application prospects.Material preparation is the premise of 3D printing applications.However,most of the existing devices are the original plastic extruding machine.While the processing properties,rheological properties of carbon fiber composite material have great difference with ordinary plastic of 3D printing molding.The material extrusion principle,material extrusion device and process conditions are studied for the producing of carbon fiber composite material for 3D printing,and these theoretical and experimental analysis of the material characteristics provide the foundation for the reality of carbon fiber composite material 3D printing system.The main completed work is as follows:(1)Extrusion principle of carbon fiber composite material for 3D printing.The basic characteristics and processing technology of carbon fiber composite materials are analyzed.Simulation analysis of 3D printing fused deposition molding is carried out for the feasibility of machining of carbon fiber composite material.According to the requirements of material processing characteristics,element requirements of molding process conditions are figured out and feasibility is analyzed.(2)Extrusion device research of carbon fiber composite material for 3D printing.Screw extrusion system the most important part in extrusion mechanism is analyzed and designed.Through the combination of theory and empirical formula,The screw is designed matching with 3D printing fused deposition molding requirements.Fluid theory of the solid conveying zone,and melting period is calculated andanalyzed,verifying the rationality of screw parameter settings.(3)Characteristic analysis and experimental analysis of carbon fiber composite material extrusion device for 3D printing.Numerical simulate the extrusion system channel model,which verifies the reasonableness of device design in theory.Using the control variable method extrude out carbon fiber wire under different production conditions,which including carbon fiber mass fraction,screw speed and heating temperature.These wires are processed into test pieces by 3D printing,and mechanical properties of test pieces are tested.figuring out the respective influence of three variables to carbon composite fiber.Based on the research of extrusion principle,material extrusion device and experimental analysis of carbon fiber composite material for 3D printing,foundation and reference are provided for the reality of carbon fiber composite material 3D printing system,which plays an significant role in 3D printing industrial application.