The Design Of Piezoelectric Micro Feed System Based On Dual Drive Control Technology

Micro-feed system is a key component of precision machining and ultraprecision machining equipment and machine tools,its feed accuracy determine the accuracy of precision machining and ultra-precision machining,and the system feed accuracy depends on micro-feed system control precision and transmission precision.Dual control technology is use two drives drive the same workbench in single degree of freedom.Apply dual-drive control technology in precision CNC machining can effectively simplify the transmission mechanism and improve the machining accuracy.In this paper,aimed at trace feed movement in precision machining and ultraprecision machining,combined dual drive control technology with micro feed technology,through complete the system overall scheme design,selection of key parts,hardware system structures,the related mathematical model establishment and simulation and control system software development design the piezoelectric ceramic micro feeding system which based on dual drive control technology,design and make relevant verification experiment,verify the validity and practicability of the design.The specific contents are as follows:(1)Designed the overall framework double piezoelectric drive feed drive system,accomplished key components selection,use ACS controller,PPC positioning controller,double drive piezoelectric feed workbench and LVDT micrometer constitute the hardware system.(2)From the perspective of piezoelectric hysteresis nonlinearity,use modified PI feedforward inverse model combined with PID control to improve the piezoelectric hysteresis characteristics,build Parallel double piezoelectric drive control model and simulation for the double piezoelectric drive micro feeding system.Make continuous control experiment,shows that the control method can reduce the piezoelectric ceramic hysteresis characteristics.(3)Designed the system control software,connect the ACS SPiiPlus control software and system hardware effectively,research ACS controller & piezoelectric ceramic drive control of the overall system and dual piezoelectric micro feed synchronous control.(4)In view of the micro feed repeat positioning accuracy and system resolution,design related validation experiments,analyze the result of single and double drive micro feed experiment,the results show that the design of the dual piezoelectric drive micro feed system can effectively reduce the hysteresis characteristics of piezoelectric ceramics,and improve the system of feed accuracy.