Research On Control System Based On KOSSEL Parallel Arm 3D Printer

The work of the FDM type 3D printer is usually the horizontal movement of the print head,the continuous superposition of consumables,and the process of accumulating the three-dimensional entities layer by layer.At present,there are many defects in the design of the mainstream desktop-level 3D printer,such as the kinematics of the printing nozzle and the temperature control of the silk material.The movement deviation of mechanism and the poor temperature control of the printing nozzle directly affect the dimensional accuracy and surface roughness of the printed product.Therefore,the research on kinematics and temperature control of printer mechanisms has important application significance.In this paper,the KOSSEL parallel arm 3D printer is taken as the research object.Firstly,the mathematical model is established to analyze the mechanism motion deviation and precision influencing factors.Through the experiment,I level the body and adjust the motion parameters,so I can achieve clear and fast adjustment of the print head movement target.Then I compare the control effects of traditional PID and fuzzy PID,and especially explain the fuzzy PID control theory and control parameter settings.By using fuzzy simulation of Matlab's simulink library and observing the response curve of temperature simulation,I find that the temperature effect of fuzzy PID control is more stable,faster and more robust.The molten wire is smoothly extruded.In addition,the linear interpolation in 3D printing is analyzed.By comparing the traditional point-by-point comparison method,the improved Bresenham algorithm makes the number of interpolations less,the efficiency is higher,and the hardware is easier to implement.Then I analyze the print path and convert the STL slice files of the part into the BFB files by using the layered software Axon.Through comparing the experimental results of different printing paths,it can be judged that sub-area printing is the best printing method with less time,less consumables and less empty travel.This paper optimizes the problems of printer mechanism motion deviation,material deformation caused by temperature changes,software settings,etc.The deviation of the mechanism leveling and motion process is reduced,and the fuzzy PID temperature control and the stepping motor interpolation optimization are applied to the control of the 3D printer.The physical print results show that the problem of broken wire,plugging,and splitting layer in the original printing process has been improved.The product has good roughness,detail performance and dimensional accuracy are greatly improved.The optimization results have greater application and promotion value.