慢走絲工作原理：

　　慢走(zou)絲(si)(si)是利用連續移(yi)動的細金(jin)屬(shu)絲(si)(si)（稱為電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)）作電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)，對工(gong)件(jian)(jian)進(jin)行脈沖火(huo)花(hua)(hua)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)蝕除金(jin)屬(shu)、切割成(cheng)(cheng)型的一(yi)種加(jia)(jia)工(gong)機(ji)床。慢走(zou)絲(si)(si)加(jia)(jia)工(gong)時(shi)在(zai)線(xian)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)與(yu)工(gong)件(jian)(jian)之間(jian)(jian)存在(zai)的疏松接觸(chu)式輕(qing)壓放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)現(xian)象。當柔性電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)與(yu)工(gong)件(jian)(jian)接近到通常認(ren)為的放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)間(jian)(jian)隙(xi)(例如8～10μm)時(shi)，并不發生火(huo)花(hua)(hua)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)，甚至當電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)已(yi)接觸(chu)到工(gong)件(jian)(jian)，從(cong)顯(xian)微(wei)(wei)鏡中已(yi)看不到間(jian)(jian)隙(xi)時(shi)，也常常看不到火(huo)花(hua)(hua)，只有當工(gong)件(jian)(jian)將電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)頂彎(wan)并偏(pian)移(yi)一(yi)定距離(幾(ji)微(wei)(wei)米到幾(ji)十微(wei)(wei)米)時(shi)才發生正常的火(huo)花(hua)(hua)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)。此時(shi)線(xian)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)每進(jin)給1μm，放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)間(jian)(jian)隙(xi)并不減(jian)少1μm，而是電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)增(zeng)加(jia)(jia)一(yi)點線(xian)間(jian)(jian)張(zhang)力(li)，工(gong)件(jian)(jian)則(ze)增(zeng)加(jia)(jia)一(yi)點側向壓力(li)，顯(xian)然，只有電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)和工(gong)件(jian)(jian)之間(jian)(jian)保持一(yi)定的輕(qing)微(wei)(wei)接觸(chu)壓力(li)后(hou)才能形成(cheng)(cheng)火(huo)花(hua)(hua)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)。據(ju)此認(ren)為在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)絲(si)(si)和工(gong)件(jian)(jian)之間(jian)(jian)存在(zai)著某種電(dian)(dian)(dian)(dian)(dian)(dian)化學產生的絕緣薄膜介質。

慢走絲加工效率：

　　（1）高加工效率

　　由于ns級(ji)大峰(feng)值電(dian)流脈(mo)沖電(dian)源技(ji)術(shu)及檢測(ce)、控制(zhi)、抗干擾技(ji)術(shu)的(de)發展，低速(su)走絲(si)電(dian)火花線切(qie)割機的(de)加工(gong)效率也在不斷提(ti)高。

　　（2）較大厚(hou)度工件的加工效率

　　在切割300 mm厚的(de)工件(jian)時(shi)，加工效率可達170 mm2/min。這是很(hen)有實(shi)際意義的(de)技術提(ti)升。

　　（3）厚(hou)度變(bian)化工件(jian)的加工效率

　　自動檢測加工件的厚度(du)，自動調整(zheng)加工參數，防止(zhi)斷(duan)絲，達到(dao)該狀態的高加工效率(lv)。

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