Development And Key Technology Research Of 5-DOF 3D Printing Device

FDM(Fused Deposition Modeling)is one of the most widely used and mature 3D printing technologies,which is widely used in education,medical treatment,new material manufacturing and other fields.However,it is necessary to add support structure to complete the forming due to the limitation of its forming principle when printing some specimens with cantilever,hollow structure and complex free-form surface specimens,which not only wastes time and materials,but also reduces the surface quality of the printed specimens.In order to overcome these problems,this paper proposes a 3D printing device with five degrees of freedom based on the principle of FDM,which aims to reduce the consumption and improve the surface quality of the printed specimensIn this paper,the overall layout design and test prototype construction of the whole printing device are carried out;the functions of each systems of the printing device are analyzed,and the specific mechanical structure design of each functional system is carried out 3-P[2-SS]parallel nozzle mechanism moves horizontally in X,Y and Z axes,at the same time,the U-3-PUS parallel printing platform mechanism deflects around the X and Y axes.Five degrees of freedom motion is realized by linkage of two groups of parallel mechanisms.It realize the printing of the test pieces with cantilever,hollow structure and complex free-form surfaces under the condition of reducing the support structure or even removing the support structureIn this paper,the degree of freedom analysis and kinematics forward and inverse solution analysis of the parallel nozzle mechanism and the parallel printing platform mechanism are carried out.And the mathematical models of the relationship between the motion input and output of each parallel structure are established,which provides the design basis for the control program.On this basis,the finite element model of U-3-PUS parallel printing platform mechanism is established,and the static analysis of the structure is carried out,which meets the strength requirements.The multi-body dynamic simulation model of U-3-PUS parallel printing platform mechanism is established,and the angle kinematics analysis curve of the printing platform is obtained by inputting the specific motion forms,which verifies the movement feasibility of the parallel mechanism.The fuzzy logic is introduced into the heating system control of the printing device,and the fuzzy self-adaptive PID control method of the printer is established to improve the temperature control efficiencyBased on the principle and characteristics,a method of reducing or even removing the support structure of the 5-DOF 3D printing device is proposed.The specific method of reducing the supporting structure by linkage of the 5-DOF 3D printing device is analyzed Finally,the printing test is carried out on the cantilever structure samples with multiple angles to verify the effect of the 5-DOF 3D printing device on reducing the supporting structure of some cantilever structures within a certain angle range.The typical hollow structure is printed,which verifies the effect of 3D printing device to reduce the support structure of some hollow structures.