Design And Analysis Of Transmission Mechanism Of 3D Printer Based On FDM Technology

In recent years,with the rapid rise of 3D printing technology,desktop-level 3D printer based on FDM technology has become a consumer electronics products for people's daily life to add convenience and fun.As a consumer electronics product,the contradiction between its cost and precision is a key factor restricting its development.This paper presents a method to effectively improve the positioning accuracy of the transmission system without adding hardware cost by dynamic modeling the transmission mechanism,calibrating the principle error and using the control program to compensate.First of all,the existing forms of transmission mechanism of 3D printer based on FDM technology were summarized and analyzed.The more advanced H-Bot/CoreXY structure was selected as a research object.The Lagrangian method was used to establish its dynamic model.Then,a dynamic simulation model was established by using Matlab Simulink according to the dynamic model.Since a series of parameters in the model cannot be obtained directly,the parameters needed to be identified.Estimate the parameters according to the experience and a series of random experiments,determine their respective range of values,analyze the impact of parameters on the model through the control variable test,then gradually reduce range of the parameters and optimize the parameters through a series of orthogonal test.Finally,it was verified by the test that the result of the dynamic simulation using the optimized parameters can accurately describe the actual motion of the 3D printer's transmission mechanism.The uniaxial kinematic calibration of the 3D printer drive mechanism was achieved.The differential error compensation method was used to realize the error compensation of the single-axis motion of the 3D printer,which greatly improves the positioning accuracy.