超声辅助电解磨削GH625微小孔工艺研究

超声振动辅助电解磨削加工技术是一种以超声振动作为辅助、电解磨削为主要加工方式实现零件精加工的新型加工技术。为获得更高表面质量的管电极微孔,首先利用单因素法对GH625材料进行管电极打孔,初步得到最小平均锥度0.043°的微小孔,然后通过正交试验研究脉冲电压、电解液浓度、主轴进给速度、阴极转速对加工微小孔锥度和表面质量的影响规律。结果表明:在脉冲电压7 V、电解液质量分数14%、阴极转速12000 r/min、进给速度0.7 mm/min下,可获得内表面粗糙度和平均锥度分别为Ra0.499μm与0.036°的微小孔。

Research on Ultrasonic-assisted Electrochemical Grinding Process of GH625 Micro Hole

As a new type of machining technology,ultrasonic vibration-assisted electrochemical grinding is employed to achieve the precision machining of mechanical parts through combining ultrasonic vibration and electrochemical grinding.In order to obtain tube electrode micropores with higher inner-surface quality,single factor method was used to perforate the tube electrode on the GH625 material,and the micro hole with the minimum average taper of 0.043°was initially obtained.Then,the influence of pulse voltage,electrolyte concentration,spindle feed speed and cathode rotating speed on the taper and surface quality of micro hole by orthogonal test were studied.The results showed that the micro holes with inner-surface roughness of Ra0.499μm and average taper of 0.036°could be obtained under the conditions of pulse voltage of 7 V,electrolyte mass fraction of 14%,cathode speed of 12000 r/min and feed speed of 0.7 mm/min.