The Design Of Tool Wear Compensation System Based On Piezoelectric Actuator

With the development of nano-micron technology, demand of precision is increasing more and more in the field of machining. And tool wear is an important factor in influence of accuracy. In precision and ultra precision machining, the impact caused by such wear will be even greater. To resolve this problem, we need a tool wear compensation device which can use micrometer or even nanometer to adjust the blade position, thereby improving accuracy. As an ideal micro-nano displacement device, piezoelectric ceramics is small, displacement, high resolution, large carrying capacity, no noise, no heat and so on, the tool wear compensation based on piezoelectric actuator can achieve micron-level compensation.This design tool wear compensation system which is driven by piezoelectric ceramics, its control core is SCM. Through experiments, we analyzed the relationship between voltage-displacement of piezoelectric ceramic micro-displacement device which we choose. Through experiments, we analyze the relationship between voltage-displacement of piezoelectric ceramic micro-displacement device which we choose, and propose an effective method for tool wear compensation system which can eliminate the influence of piezoelectric nonlinearity, hysteresis and creep. We design and check tool wear compensation device, its power is the SCM, and use the average curve model to establish compensation system model. Under voltage control method, we designed a piezoelectric actuator power which based on the series voltage negative feedback principle, the DC power supply circuit and the piezoelectric ceramic discharge circuit. Through simulation, we tested the high linearity and low ripple of power supply.We illustrate the principle of tool wear compensation control system which applies to actual production. According to the selected scheme, we choose the SCM and interface devices for the controller, and analyz the technical specifications and features for all parts of the expansion unit. And then, we prove the choice is reasonable, and design its interface circuit.Under the program and hardware has been chosen, we propose a software process of compensation system, discuss the implementation of the various parts of the software program with features modular, and give several typical module subroutines. Finally, we summarize the whole article, and pointe out the direction for further study and improvement of tool wear compensation system which is based on piezoelectric-driven.