Selective Enhancement Slicing Method For 3D Printing Of Continuous Carbon Fiber Composite Material

Since the advent of 3D printing technology in the 1980 s,it has been closely used and studied by domestic and foreign scholars for its high productivity,short development cycle and easy to process complex models.Therefore,it's widely used in aerospace,automotive and some important fields including industry,military,and medical care.Carbon fiber material has the characteristics of light weight,high strength,high temperature resistance and corrosion resistance.So,combining this material with 3D printing can not only exert its advantages in material properties and molding methods,but also solve the cumbersome problem of carbon fiber material forming and difficult to manufacture complex structures.In addition,it can also improve the forming properties of thermoplastic molded parts while reducing the cost of 3D printing of pure fiber materials.Due to the continuity of the fibers and the Characteristics of 3D printing layers overlay,the slicing of the three-dimensional model is the prerequisite of 3D printing,which is critical to the enhancement of the thermoplastic material.Therefore,for the selection of continuous fiber reinforced layer in 3D printing slicing process and path planning and the printing problems of carbon fiber materials,matrix materials,support materials and other materials,the three-dimensional model slice processing and process planning method are studied.In this paper based on FDM 3D printing technology,continuous carbon fiber composites is used to improve the performance of thermoplastics,and to make full use of the different characteristics of various materials to achieve the goal of improving the molding performance and surface quality of the printing model.The main research work is as follows:(1)Research on multi-parameter relationship of 3D printing slicing based on carbon fiber selective enhancement.Aiming at the influence of multi-material and multi-process parameters on the forming performance,the multi-material 3D printing process parameter relationship model was studied to reveal the influence relationship of multi-material and multi-nozzle printing parameters in the slicing,and the carbon fiber reinforced 3D printing process parameter coordination mechanism was established.The basis for the printing parameters set under the material control shape in the process of slicing.(2)Research on slicing interlayer selectivity enhancement processing method for continuous carbon fiber 3D printing.Firstly,in view of the demand of carbon fiber reinforced multi-nozzle and multi-material,the trajectory and switching mechanism of multi-nozzle are studied,and path coordination planning is carried out.On the basis of supporting multiple nozzles,in order to meet the requirement of selective enhancement of molding performance of thermoplastic composite 3D printing model,an interlayer selective enhancement processing algorithm was proposed to enhance the molding performance of the printing model;For the continuity characteristics of the carbon fiber reinforced layer material and the spiral offset filling algorithm,there is no consideration of the problem that the bias intersection point is relatively simple in the extension line of the bias line segment and the jump length.An improved spiral offset filling algorithm for carbon fiber reinforced layer is proposed to ensure the continuity of the carbon fiber reinforced layer forming path.(3)Research on the slicing treatment of shells with continuous carbon fiber 3D printing selectivity enhancement.Firstly,for the process of model shell,study the formation principle of the model shell;On the basis of the formation of the outer casing,for the surface quality enhancement requirements of the thermoplastic composite 3D printing model,the outer casing and the filling are separated in the process of slicing,and a selective enhancement algorithm of the outer casing and the filling is proposed to enhance the surface quality of the model;Finally,for the continuous carbon fiber 3D printing of the complex model with suspended structure,the shell support regulation algorithm of carbon fiber 3D printing is proposed to realize the adjustable supporting material,and the supporting model is easy to remove the supporting material.The correctness of the above algorithm is verified by simulation test and printing experiment.(4)Design and experiment of 3D printing online slice processing platform.Aiming at the limitation of the time and space of 3D printing by the off-line software client and the complicated parameter setting in the slicing software,the 3D printing online slicing processing platform is designed and implemented,which can realize online slicing,model preview,filling path display and print monitoring functions,and the research content of the previous theoretical algorithm is added to the server engine of the 3D printing online slicing platform.The practicality of the platform and the feasibility of the theoretical algorithm are proved by printing experiments and performance tests.