鏡面電火花加工(gong)重(zhong)要(yao)應用于(yu)復雜模(mo)具(ju)型腔、尤(you)其是未便于(yu)進(jin)(jin)行拋(pao)光作業的(de)(de)復雜曲面的(de)(de)細密(mi)加工(gong)，可以省去手(shou)工(gong)拋(pao)光工(gong)序，進(jin)(jin)步零件(jian)的(de)(de)使用性(xing)能，對縮(suo)短模(mo)具(ju)制造周期，具(ju)有十分緊張的(de)(de)現實意義。

       導電(dian)(dian)(dian)(dian)性(xing)微粉末進入放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)間(jian)隙(xi)(xi)后，相稱于(yu)在兩極間(jian)接(jie)入多(duo)段小導體，同(tong)(tong)時(shi)(shi)還使(shi)(shi)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)間(jian)隙(xi)(xi)中的(de)(de)(de)電(dian)(dian)(dian)(dian)場發生畸變，使(shi)(shi)間(jian)隙(xi)(xi)中絕緣介質的(de)(de)(de)抗擊穿能力降落，放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)容易發生，放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)間(jian)隙(xi)(xi)響應(ying)增(zeng)(zeng)大(da)(da)。增(zeng)(zeng)大(da)(da)的(de)(de)(de)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)間(jian)隙(xi)(xi)減小了(le)(le)電(dian)(dian)(dian)(dian)蝕產物對放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)的(de)(de)(de)引發作用，并(bing)且(qie)有利于(yu)電(dian)(dian)(dian)(dian)蝕產物的(de)(de)(de)流動與排出，從而削減了(le)(le)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)集中的(de)(de)(de)發生，使(shi)(shi)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)在加工(gong)外(wai)觀均勻(yun)分布。放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)間(jian)隙(xi)(xi)增(zeng)(zeng)大(da)(da)，放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)通道變粗，在同(tong)(tong)樣放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)脈沖能量下，工(gong)件外(wai)觀受熱面積增(zeng)(zeng)大(da)(da)而受熱強(qiang)度降落，從而在工(gong)件表層形成(cheng)大(da)(da)而淺(qian)的(de)(de)(de)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)蝕坑(keng)。同(tong)(tong)時(shi)(shi)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)間(jian)隙(xi)(xi)的(de)(de)(de)增(zeng)(zeng)大(da)(da)還降低了(le)(le)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)對熔化金屬的(de)(de)(de)拋出能力，使(shi)(shi)較(jiao)多(duo)熔化金屬在工(gong)件表層重新凝固，進一(yi)步減小了(le)(le)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)蝕坑(keng)的(de)(de)(de)深度。因此混粉電(dian)(dian)(dian)(dian)火花加工(gong)在工(gong)件外(wai)觀形成(cheng)大(da)(da)而淺(qian)的(de)(de)(de)放(fang)(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)蝕坑(keng)。