【摘要】 针对电火花精修方孔所用窄长铜条电极机械加工精度和表面质量差、成品率低的问题，提出一种电极修正方法，开展方形电极修正试验。对机加工电极进行检测后，对锥度小于0.02 mm，直线度小于0.05 mm的不合格电极开展电极修正试验，使电极直线度提高至0.02 mm，最后采用研磨夹具对电极进行精磨，使电极直线度小于0.01 mm，表面粗糙度小于Ra1.6μm。结果表明，对电极进行修正及精磨，方形电极的直线度与表面质量得到提高，可满足精密方形电极的要求，电极合格率提高至60%以上。运用合格电极开展方孔电火花精修试验，方孔拐角精度和表面质量得到极大提高。方孔最小圆角半径为0.04 mm，加工锥度为0.03 mm，表面粗糙度为Ra2.219μm。更多还原

【Abstract】 To address issues with machining difficulty,poor accuracy,surface quality,and low yield rates associated with narrow and long copper electrodes used in EDM square hole finishing,we propose an electrode correction method and conduct square electrode correction experiments. Electrodes that did not meet the dimensional accuracy requirement of 0.02 mm and straightness requirement of 0.05mm underwent correction experiments. The electrodes were straightened to 0.02 mm and then fine-ground using a grinding jig. This resulted in a straightness of less than 0.01 mm and a surface roughness of less than Ra1.6 μm. The machining accuracy and surface quality of the square electrodes were improved through the electrode correction and fine-grinding method. This improvement enables the square electrode to meet precision requirements,resulting in an increase in the electrode′s qualified rate to over 60%. The EDM test was conducted to create square holes using qualified electrodes,resulting in significant improvements in both corner accuracy and surface quality. The square hole has a minimum corner radius of 0.04 mm,a machining taper of 0.03 mm,and a surface roughness of Ra2.219 μm.更多还原