CAJ | 학술논문

针对难加工材料的大深径比微小深孔加工这一工艺难题，设计并制造了基于工件振动的超声电火花复合加工装置。该装置包括一个已优化的压电振子和一台普通电火花机床。为提高加工效率，对压电振子进行了优化分析，使压电振子具有合适的纵振模态、固有频率和较大的振幅，压电振子中陶瓷片具有合理地安装位置。选择模具钢作为加工材料进行大深径比微小深孔的加工实验，比较研究了超声电火花复合加工装置和普通电火花机床加工大深径比微小深孔的加工效率。实验表明，超声电火花复合加工装置的加工效率更高。研究了超声激励电压、脉冲电流、脉冲宽度以及脉冲间隙等参数对大深径比微小深孔加工效率的影响，得出各参数较优的设置值。根据实验结果可以看出，超声电火花复合加工装置可以有效地加工出直径为矱0．5mm、深径比为60的微小深孔，适用于难加工材料的大深径比微小深孔加工。
침대난가공재료적대심경비미소심공가공저일공예난제，설계병제조료기우공건진동적초성전화화복합가공장치。해장치포괄일개이우화적압전진자화일태보통전화화궤상。위제고가공효솔，대압전진자진행료우화분석，사압전진자구유합괄적종진모태、고유빈솔화교대적진폭，압전진자중도자편구유합리지안장위치。선택모구강작위가공재료진행대심경비미소심공적가공실험，비교연구료초성전화화복합가공장치화보통전화화궤상가공대심경비미소심공적가공효솔。실험표명，초성전화화복합가공장치적가공효솔경고。연구료초성격려전압、맥충전류、맥충관도이급맥충간극등삼수대대심경비미소심공가공효솔적영향，득출각삼수교우적설치치。근거실험결과가이간출，초성전화화복합가공장치가이유효지가공출직경위확0．5mm、심경비위60적미소심공，괄용우난가공재료적대심경비미소심공가공。
For solving the problem of machining micro deep holes with high aspect ratio in hard materials,an Ultrasonic Vibration Assisted Electrical Discharge Machining ( UV-EDM ) technology with workpiece vibration system was designed and manufac-tured.The device was composed of an EDM machine and an optimized piezoelectric vibrator.For advancing the machining effi-ciency,the piezoelectric vibrator was optimized to have appropriate longitudinal mode and natural frequency, the appropriate placement of the piezoelectric vibrator’ s ceramics,and the magnified displacement amplitude of the piezoelectric vibrator.The die steel was selected as experimental material.The machining efficiency of the UV-EDM and traditional EDM was studied contras-tively and it was found that the UV-EDM was more effectively than EDM in drilling micro holes.The parameters including ultra-sonic drive voltage,discharge current,pulse on-time and pulse off-time on the machining efficiency were studied and the optimum parameters were gained.The test result indicated the micro deep hole with diameter φ0.5mm and high aspect ratio 60 could be drilled effectively.The proposed UV-EDM is valuable in machining micro deep holes with high aspect ratio in hard materials.