钛合金EJM加工中超声辅助作用研究

Ultrasonic Assistance in Electrochemical Jet Machining of Ti6Al4V

本文致力于研究钛合金在应用超声辅助(UA)进行电解液喷射加工(EJM)时的表现。钛合金进行EJM加工时,工件表面易生成钝化层进而导致加工效率降低。本文分别对应用氯化钠(NaCl)电解液和硝酸钠(NaNO_3)电解液的超声辅助钛合金EJM加工效果进行研究,通过分析比较常规EJM加工以及功率一定,频率分别为25,68,135 kHz的三种超声辅助EJM加工所得钛合金样槽的表面氧化物百分比、深宽比、表面粗糙度和微观形貌,论证了UA在钛合金EJM加工中的具体作用,为改进钛合金EJM加工的质量与效率提供了新的思路与方法。

We focused on the machining performance of Ti6Al4V's electrochemical jet machining( EJM) with the use of ultrasonic assistance( UA). When EJM is applied to process Ti6Al4V,the passivating layer on the surface always reduces the machining efficiency. Sodium nitrate solution( NaNO_3) and sodium chloride solution( NaCl) were tested in Ti6Al4V's EJM with the use of UA,respectively. By analyzing the channel aspect ratio( depth/width),channel surface roughness( Sa),oxide percentage and surface topography of the machined workpiece under the condition of normal EJM and EJM with UA under the frequencies of 25,68,135 kHz,the effect of UA for EJM was validated,which offered a new idea for improving the quality and efficiency of Ti6Al4V's EJM performance.