The effects of machining parameters on machining time in piezoelectric self-adaptive micro-EDM

Abstract

Abstract.A new piezoelectric self-adaptive micro electrical discharge machining system, based on inverse piezoelectric effect, was developed in this paper to improve stability of micro-EDM process The Working mechanism and working process of this new technology were illustrated. In this new technology, the piezoelectric actuator was used as the micro driven system to control the discharge gap distance depending on the discharge state. This paper presents an investigation on the effects of machining parameters on machining efficiency in piezoelectric self-adaptive discharge machining. The effects of machining parameters such as open voltage, capacitance, resistance, spindle rotational speed and initial feed speed have been analyzed on machining efficiency by using signal to noise analysis method based on orthogonal experiment. IntroductionMicro-EDM is a precision machining process for machining micro-structures; its material removal mechanism is based on melting and vaporizing material with the heat and pressure generated by electrical discharge, so it can machine any type of conductive material, regardless of its hardness [1][2][3] . The basic characteristic of micro-EDM process is similar to that of normal EDM process [4] , but higher requirements were set on the precision and sensitivity of electrode drive system for micro-EDM system because of the reduction of discharge gap and discharge energy. In this paper, in order to improve the process stability and achieve better micro-EDM performance, a new piezoelectric self-adaptive micro-EDM technology, based on inverse piezoelectric effect, was presented in this paper.The working mechanism and micro-EDM device of this new technology is different from the normal micro-EDM, it has the special characteristics. The work presented in this paper aims to study the influence of machining parameters on machining time of this new piezoelectric self-adaptive micro-EDM.