基于界面酸化的微细电解加工用脉冲电源设计

Design of Pulse Power Supply for Micro ECM Based on Interface Acidification

高频脉冲电源是实现精密微细电解加工的重要因素之一。为兼顾加工定域性及提升工件蚀除速率,基于界面酸化特性机理,文中研制了一种能实现脉间期内向工件/电解液界面加酸特性的高频脉冲电源。利用研制的高频脉冲电源,进行微细电解加工实验。采用0.5 mol·L^(-1) NaNO3电解液,在0.5 mm厚的304不锈钢上加工阵列孔。实验结果显示,采用研制的高频脉冲电源加工阵列孔,蚀除速率由双电极脉冲电源的3.21×10^(-4) mm^(3)·s^(-1)提升到6.55×10^(-4) mm^(3)·s^(-1),工件蚀除速率得到明显提高,证明了所设计脉冲电源的可靠性。

The high-frequency pulse power supply is one of the important factors to achieve precise micro electrochemical machining.In order to take into account the machining locality and increase the erosion rate of workpiece,the study develops a high-frequency pulse power supply based on interface acidification mechanism,which is able to add acid to the workpiece/electrolyte interface during the pulse interval period.The micro-electrochemical machining experiment is carried out using the developed high-frequency pulse power supply.The pulse power supply is utilized to process array holes on 0.5mm thick 304 stainless with 0.5 mol·L^(-1) NaNO 3 electrolyte.The experiment results show that compared with the two-electrode pulse power,the erosion rate increases from 3.21×10^(-4) mm^(3)·s^(-1) to 6.55×10^(-4) mm^(3)·s^(-1) by using high-frequency pulse power to process array holes.The workpiece erosion rate is significantly improved,which proves the reliability of the designed pulse power supply.