慢走絲工作原理：

　　慢走絲(si)是利(li)用連續移(yi)動的細金屬(shu)絲(si)（稱為(wei)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)）作電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)，對(dui)工(gong)(gong)件(jian)(jian)進行(xing)脈沖火(huo)(huo)花放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)蝕除金屬(shu)、切割成型(xing)的一種加(jia)工(gong)(gong)機床。慢走絲(si)加(jia)工(gong)(gong)時(shi)(shi)在(zai)線電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)與工(gong)(gong)件(jian)(jian)之間存在(zai)的疏松接(jie)觸式輕壓(ya)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)現象。當柔(rou)性電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)與工(gong)(gong)件(jian)(jian)接(jie)近到通常(chang)認為(wei)的放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)間隙(例如(ru)8～10μm)時(shi)(shi)，并(bing)(bing)(bing)不(bu)發生(sheng)(sheng)火(huo)(huo)花放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)，甚至當電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)已(yi)接(jie)觸到工(gong)(gong)件(jian)(jian)，從(cong)顯微鏡中(zhong)已(yi)看(kan)不(bu)到間隙時(shi)(shi)，也常(chang)常(chang)看(kan)不(bu)到火(huo)(huo)花，只有(you)當工(gong)(gong)件(jian)(jian)將電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)頂彎并(bing)(bing)(bing)偏移(yi)一定距離(幾微米到幾十微米)時(shi)(shi)才發生(sheng)(sheng)正(zheng)常(chang)的火(huo)(huo)花放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)。此時(shi)(shi)線電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)每進給1μm，放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)間隙并(bing)(bing)(bing)不(bu)減(jian)少1μm，而是電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)增加(jia)一點(dian)線間張力，工(gong)(gong)件(jian)(jian)則增加(jia)一點(dian)側向壓(ya)力，顯然，只有(you)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)和(he)工(gong)(gong)件(jian)(jian)之間保持一定的輕微接(jie)觸壓(ya)力后才能形成火(huo)(huo)花放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)。據(ju)此認為(wei)在(zai)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)絲(si)和(he)工(gong)(gong)件(jian)(jian)之間存在(zai)著(zhu)某種電(dian)(dian)(dian)化學產生(sheng)(sheng)的絕緣(yuan)薄膜介質。

慢走絲加工效率：

　　（1）高加工效率

　　由于ns級(ji)大峰值電(dian)流脈沖電(dian)源技術及檢(jian)測、控制、抗干擾(rao)技術的發展，低速走絲電(dian)火花線切割機的加工(gong)效率也在不(bu)斷提高。

　　（2）較大厚度(du)工(gong)件的加工(gong)效率

　　在切割300 mm厚的工(gong)件時，加工(gong)效率可達170 mm2/min。這是(shi)很有(you)實(shi)際意義的技術(shu)提(ti)升。

　　（3）厚度變化工件的加工效率

　　自動檢測加工(gong)件的(de)厚度，自動調(diao)整加工(gong)參數，防止斷(duan)絲，達到該狀態的(de)高加工(gong)效率。

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