Research On Control Method And Polishing Experiment Of Micro-Motion Polishing Tool System

In the era of rapid development of science and technology,the precision requirements of free-form surface parts in various hotspots are increasing,such as biomedicine,green energy,optical instruments and so on.Therefore,further improving the design and processing accuracy of free-form surfaces is the focus of current scientific and technological competition in various countries.At the same time,the quality and precision of free-form surface parts are also the important manifestation of the national science and technology level.In the process of manufacturing free-form surface parts,the polishing process directly determines the surface precision and quality.At present,based on the deterministic polishing theory,computer-controlled polishing technology can achieve predictability of surface polishing,which greatly improves the quality of polishing and efficiency.This paper theoretically studies the material removal law under different trajectories;the kinematics analysis is based on the micro-polishing tool system in theory;the control program of the micro-polishing tool system is designed based on Simulink;the simulink program is applied to control the micro-polishing tool system for polishing experiments;at the same time,the material removal law under different polishing trajectories and the reliability of the control program can be verified from the experiments.During the experiments,the polishing experiments of the tool head with different polishing trajectories are mainly realized by the four sets of pneumatic rods of the tool system.Therefore,in the kinematics analysis,the motion laws of the four groups of pneumatic rods under different polishing trajectories are mainly studied.The polishing trajectory of the study is divided into a linear polishing trajectory and acurved polishing trajectory.The kinematics analysis shows the variation law of the pneumatic rod under two polishing trajectories.Based on the Simulink,the semi-physical simulation program of micro-polishing tool system is designed.The custom S function and corresponding TLC file are written in the control program,the C code of the control program is generated through code generation,making the control program connect with the hardware to transfer the information,and set the control program module parameters according to the hardware attributes to achieve the control effect.According to the engineering method,the improved PID control parameters are set,and the optimal PID parameters for controlling the four sets of pneumatic rods are selected.The simulation control program is used to control the micro-polishing tool system.It is divided into linear track polishing experiment and curve track polishing experiment.The feasibility of the control program is verified by comparing the theoretical and actual pneumatic rod changing rules after the experiment.Material removal profile and material removal depth of the Experimental workpiece are analyzed,the curve trajectory polishing experiment is divided into two groups according to the radius of the contact circle and the radius of the trajectory circle,and the influence of the radius of the trajectory circle on the depth and profile of the material is analyzed;the working range of the polishing force of the tool system is modified according to the experiment to improve the polishing precision of the tool system.