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慢走絲加工

慢走(zou)絲是利用連(lian)續移動的(de)(de)細金(jin)屬絲（稱為(wei)電(dian)(dian)極絲）作(zuo)電(dian)(dian)極，對工件進行脈沖(chong)火花放電(dian)(dian)蝕除(chu)金(jin)屬、切割成型的(de)(de)一種加(jia)工機(ji)床。慢走(zou)絲加(jia)工時在線電(dian)(dian)極與(yu)(yu)工件之間存在的(de)(de)疏松(song)接觸(chu)式輕(qing)壓放電(dian)(dian)現象(xiang)。當(dang)柔性電(dian)(dian)極絲與(yu)(yu)工件接近到(dao)通(tong)常認為(wei)的(de)(de)放電(dian)(dian)間隙(例如8～10μm)時，并不發(fa)生火花放電(dian)(dian)，甚至當(dang)電(dian)(dian)極絲已(yi)接觸(chu)到(dao)工件，從顯(xian)微(wei)鏡中已(yi)看不到(dao)間隙時，也常常看不到(dao)火花，只(zhi)有(you)當(dang)工件將電(dian)(dian)極絲頂彎并偏(pian)移一定距(ju)離(li)(幾微(wei)米到(dao)幾十(shi)微(wei)米)時才發(fa)生正常的(de)(de)火花放電(dian)(dian)。