Research On CNC Modification Technology Of Form Grinding Wheel Based On Dual-driving Synchronous Control

The shape accuracy of form grinding wheel is one of the important factors determining the shape accuracy of the form grinding workpiece.The CNC modification of form grinding wheel is the key technology to ensure the accuracy of grinding wheel.The feed system of traditional CNC grinding wheel modification machine mostly is single-axis single-drive.When the grinding wheel is modified,it is difficult for the driving force to act on the center of gravity of the moving parts,and the generated eccentric moment will affect modification precision.The dual-driving feed system which is synchronously drived by double servo motors in the same feed direction can achieve better rigidity and accuracy.Therefore,in this paper,based on the dual-drive synchronization control CNC modification system of form grinding wheel,the research of dual-drive synchronization control and contour error compensation of motion trajectory is carried out,the modification software is developed and the relevant experimental verification is carried out.The details are as follows:(1)Based on the analysis of CNC modification principle of form grinding wheel,the modification system of form grinding wheel based on dual-driving synchronization is designed.The composition of the system is introduced,and the hardware platform and software development of the control system are discussed.According to the motion control requirement of the modification system,the synchronous control model of dual-drive and the contour error model of form grinding wheel generatrix are modeled and analyzed.(2)For the tracking and positioning accuracy of the feed servo system,the PID parameters are adjusted and debugged based on the modeling and analysis of the full-closed control of the servo system.The synchronization control strategy is applied to the synchronization problem of dual-drive feed system.The simulation comparison and analysis are carried out to improve the synchronization control performance of dual-drive system.Based on the analysis of straight generatrix and complex generatrix contour error model,the optimal circle approximation method is used to combine the PID cross-coupling control algorithm to realize the linkage between the X and Y directions of the worktable,and improve the control precision of the modified 2D contour.(3)Design and develop CNC modification software for form grinding wheel based on Beckhoff motion controller.The modular design method is adopted in the HMI visual programming of Beckhoff TwinCAT software environment,and the interactive control software is developed to realize the motion control and trajectory control of the CNC modification system of form grinding wheel to achieve the purpose of grinding wheel modification.(4)Build an experimental platform and design experimental protocols and processes.The software and hardware communication test based on Beckhoff motion controller,as well as the dual-drive synchronous control and the modified two-dimensional contour linkage control experiment,and the CNC modification experiment of the grinding wheel were carried out to verify the feasibility of the related design.