Research On The Key Technologies Of Photocuring Printing For High Viscosity Materials

The rapid development of photocurable printing materials breaks through the material limitation of photocurable printing to some extent,but it puts forward more strict requirements of printing for photocurable printers.Based on the analysis of the development situation of photocurable printing technology and materials,this paper summarized the influence of the increase of highperformance photocuring printing materials' molecular weight and viscosity on printing technology.High viscosity printing materials will increase the force on the printing platform,resulting in printing failure,which severely limits the practical application of high-performance materials in the field of 3D printing field.With the expansion of photocuring printing to functional materials,how to ensure the smooth printing of high viscosity printing materials has become an research direction that has the important meaning.Firstly,in order to explore the stress of the printing platform in the process of photocuring printing,this paper constructed a photocuring printing experimental platform that was built with servo lifting device as the center according to the functional requirements of the photocuring printing experiment.The experimental platform was divided into mechanical part and electrical part,and has the function of photocuring printing and force feedback.Besides,it also could cooperate with the servo contoller to communicate with the upper computer and complete the communication between the printer control chip and servo controller.The experimental platform could verify the mechanical properties in the photocuring printing process.Secondly,in the photocuring printing process of high viscosity materials,the stress damage of release film is an important reason for failure of the printing.Therefore,in order to analyze the stress of the release film,this paper simplified the original printing process and established the release film simulation model.And verified the relationship between the stress of the release film and the curing layer through the release film simulation experiment.By analyzing the simulation results,the stress curves of the release film in the first layer of printing was obtained,which providing data support for increasing the duration of photocuring printing.Thirdly,in order to obtain the force curves of the printing platform,this paper established a solid-liquid mixture simulation model of high viscosity materials based on the analysis of the printing process of the photocuring printer,and then used it to simulate the moving process of the printing platform and carried out the printing simulation experiment.In the experiment,the control variable method was used to conduct printing simulation experiment under different printing viscosity and lifting speed of the printing platform,then the force curves of the printing platform were obtained according to the simulation results.According to the stress of curves,the relationship between the force and the moving speed of the printing platform as well as the relationship between the force of printing platform and the viscosity of the printing material was analyzed.Finally,this paper put forward the methods about how to set the movement speed curves of printing platform through the rational analysis of the mechanical characteristics of printing platform,and carries on the simulation validation according to the curves.The verification results proved that the methods could optimize the force curves of the printing platform reasonably,and could satisfy the printing force requirements of photocuring printer when it prints high viscosity materials.The simulation results of this paper could provide effective solutions for photocuring printing of high viscosity materials.