Research On Rolling Device And Its Control For Continuous Carbon Fiber Composites 3D Printing

3D printing technology is a kind of advanced material-added manufacturing technology rising in recent years.It has the characteristics of integrated molding and not limited by the complexity of the model,which greatly shortens the development cycle of the product and improves the production efficiency.Continuous carbon fiber composites have many excellent properties,such as light weight,high strength,inner flexibility and outer rigidity,high temperature resistance,corrosion resistance,and so on,which are widely applied to various cutting-edge technology fields.The combination of continuous carbon fiber composites and 3D printing technology can integrate the excellent properties of continuous carbon fiber materials and the advantage of free forming of 3D printing technology at the same time,which has broad application prospects.The continuous carbon fiber composite 3D printing technology adopts the layer-by-layer stacking mode based on the melt deposition process,and the three-dimensional forming is realized by the natural bonding of the matrix material from the melting to the solidification.Due to various factors,such as the type of matrix material,forming temperature,layer height,structure precision and so on,there are some problems in printing parts,such as no close adhesion between the layers,poor compactness and so on,which seriously affect the molding performance.Aiming at this problem,a rolling device and its control method for continuous carbon fiber composites 3D printing are proposed,the rolling device,trajectory following algorithm and circuit control system are designed,which effectively improve the forming performance of the printing parts.The main work of this paper is as follows:(1)Research on a rolling device.In order to meet the demands of multi-direction pressure and adjustable pressure in the process of 3D pressure printing,a continuous carbon fiber 3D printing rolling device is designed.In order to ensure the accuracy and flexibility of pressing carbon fiber printing parts,the rotating structure and pressing structure of rolling device are designed,which can ensure pressing the printing tracks in all directions,and change the pressure by adjusting the relative position between the roller and the nozzle.The design of the rolling device integrates the pressure structure and the printing nozzle,and realizes the whole printing process in the form of "pressing while printing".(2)Research on the real-time tracking algorithm of roller trajectory.Because of the characteristics of the free-formation of 3D printing,printing trajectories are complex and changeable.The rolling device needs real-time identification and tracking of all printing trajectories to complete accurately and timely pressing.In order to solve the above problems,the real-time tracking algorithm of roller trajectory is designed.By extracting and identifying all the forming paths,processing the straight,curve and filling parts separately,the roller trajectory based on the physical characteristics of the pressure implementing device is obtained,and the instruction set for controlling the rotation action of the rolling device is obtained,and finally,all the printing tracks are precisely rolled by the rolling device.(3)Research on the 3D pressure printing control system.Based on 3D printer three-dimensional motion and process condition control,a 3D pressure printing control system integrated with the pressure control module is designed to carry out multi-variable coordinated processing of motion,rotation,pressure,process conditions and so on in the process of 3D printing.The control circuit and control method of the control system are designed,the whole hardware circuit board of the control system is drawn,the motion control method and pressure feedback control method of the rolling device are designed,and the complete control system of 3D pressure printing is obtained,and the rolling device and the printing nozzle work in accordance with the control rules in an orderly manner.(4)The experimental study of 3D printing pressure control system.The roll device,roller trajectory tracking algorithm and hardware control system are integrated and the printing experiment is carried out on the basis of the complete system.Pressure feedback system is used to set the pressure before printing to complete the whole pressure process with different pressures.The mechanical properties of continuous carbon fiber 3D printing samples were tested under different pressures,and the forming properties of the samples unpressurized and under different pressures were compared and analyzed.In summary,through the research on the rolling device and its control for continuous carbon fiber composites 3D printing,the interlaminar compactness and mechanical properties of 3D printed parts can be enhanced,which lays a foundation for high performance 3D printing.