對于中走(zou)絲線切(qie)(qie)(qie)(qie)割(ge)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)余留(liu)(liu)部位切(qie)(qie)(qie)(qie)割(ge)的多(duo)次加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)，首(shou)先必須(xu)解決(jue)被加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)的導(dao)電(dian)問(wen)題，因為在(zai)(zai)高精度線切(qie)(qie)(qie)(qie)割(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)中，線電(dian)極的行(xing)走(zou)路線可能(neng)需要沿加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)軌跡往復行(xing)走(zou)多(duo)次，才能(neng)保證被加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)具有較高表面粗糙度和表面精度，這時線切(qie)(qie)(qie)(qie)割(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)是(shi)靠(kao)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)余留(liu)(liu)部位起到導(dao)電(dian)作用以保障電(dian)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)正(zheng)常進行(xing)。但在(zai)(zai)進行(xing)工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)余留(liu)(liu)部位的切(qie)(qie)(qie)(qie)割(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)時，若(ruo)次切(qie)(qie)(qie)(qie)割(ge)即切(qie)(qie)(qie)(qie)下工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)余留(liu)(liu)部位，將會導(dao)致(zhi)被切(qie)(qie)(qie)(qie)割(ge)部分與(yu)母體(ti)分離，以致(zhi)導(dao)電(dian)回路中斷，無法進行(xing)繼續加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)，所(suo)以從線切(qie)(qie)(qie)(qie)割(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)的條件(jian)性和延續性考慮(lv)，必須(xu)使工(gong)(gong)(gong)(gong)(gong)(gong)件(jian)余留(liu)(liu)部位即使在(zai)(zai)多(duo)次切(qie)(qie)(qie)(qie)割(ge)的情(qing)況下也(ye)能(neng)保持與(yu)母體(ti)之間(jian)正(zheng)常導(dao)電(dian)的要求。

      為了實現上(shang)述目的(de)，力圖營造人(ren)為環境(jing)和(he)條(tiao)(tiao)件來(lai)滿足導電(dian)要求(qiu)，可采用在(zai)被(bei)切割部分和(he)母體之間(jian)粘銅(tong)片和(he)在(zai)切割間(jian)隙中塞銅(tong)片的(de)處理方法來(lai)造成人(ren)為的(de)定(ding)位條(tiao)(tiao)件和(he)導電(dian)條(tiao)(tiao)件，使(shi)得火花加工(gong)得以繼續進行(xing)。其具體做(zuo)法如下：

      （1）中走絲在被切(qie)(qie)割(ge)(ge)部(bu)分與母體材(cai)料之間(jian)粘貼連(lian)(lian)接銅(tong)片(pian)。其目(mu)的(de)是使(shi)工件(jian)余留部(bu)分在切(qie)(qie)割(ge)(ge)時(shi)與母體材(cai)料相連(lian)(lian)固(gu)定(ding)，保(bao)證(zheng)線切(qie)(qie)割(ge)(ge)有良好的(de)定(ding)位條件(jian)，從而保(bao)障(zhang)工件(jian)有優異(yi)的(de)加(jia)工質量。

       （2）在被切(qie)割部分(fen)與母體材料之間(jian)填(tian)充(chong)(chong)導(dao)電銅(tong)片(pian)。把經折疊、剪齊、錘(chui)平和修銼的(de)薄(bo)銅(tong)片(pian)填(tian)充(chong)(chong)在線電極加工(gong)(gong)形(xing)成的(de)縫隙里，并(bing)使銅(tong)片(pian)和縫隙壁緊(jin)(jin)密貼(tie)合(he)。填(tian)充(chong)(chong)此銅(tong)片(pian)的(de)目(mu)的(de)是為了(le)導(dao)電， 填(tian)充(chong)(chong)導(dao)電銅(tong)片(pian)時(shi)應注意銅(tong)片(pian)的(de)對稱布置以及銅(tong)片(pian)應同時(shi)夾緊(jin)(jin)，并(bing)且不能(neng)塞得過緊(jin)(jin)以免(mian)(mian)劃傷工(gong)(gong)件(jian)的(de)表(biao)面。不管是粘(zhan)貼(tie)連(lian)接銅(tong)片(pian)還(huan)是填(tian)充(chong)(chong)導(dao)電銅(tong)縫隙的(de)形(xing)狀， 都應該把小(xiao)銅(tong)片(pian)制成圓弧(hu)形(xing)，保證銅(tong)片(pian)表(biao)面光滑(hua)以避免(mian)(mian)劃傷工(gong)(gong)件(jian)已加工(gong)(gong)過的(de)表(biao)面。

       中(zhong)走絲(si)在采(cai)用(yong)電火花(hua)線切割機(ji)加(jia)工(gong)高硬(ying)度(du)、高精度(du)和(he)高復雜度(du)的小型工(gong)件時，按(an)照上述方(fang)法和(he)步(bu)驟進(jin)行(xing)線切割加(jia)工(gong)中(zhong)工(gong)件余留部位的精密(mi)切割，是一種(zhong)行(xing)之有效的方(fang)法，它經濟簡(jian)便、實(shi)用(yong)可行(xing)，從而(er)為改(gai)善和(he)提高精密(mi)線切割加(jia)工(gong)的質量和(he)效率摸(mo)索出新的途徑(jing)。