機(ji)械加(jia)(jia)(jia)(jia)工(gong)是指通過一種機(ji)械設(she)備對工(gong)件的(de)外形尺寸(cun)或性能進(jin)行改變的(de)過程。按(an)加(jia)(jia)(jia)(jia)工(gong)方(fang)式上的(de)差別可分為切削加(jia)(jia)(jia)(jia)工(gong)和壓力加(jia)(jia)(jia)(jia)工(gong)。

在生產(chan)過(guo)(guo)(guo)(guo)(guo)程(cheng)中，凡(fan)是改變(bian)生產(chan)對象的(de)形(xing)狀(zhuang)、尺寸、位置和(he)性質等，使其成(cheng)(cheng)為(wei)成(cheng)(cheng)品或(huo)(huo)者(zhe)半成(cheng)(cheng)品的(de)過(guo)(guo)(guo)(guo)(guo)程(cheng)稱為(wei)工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)。它是生產(chan)過(guo)(guo)(guo)(guo)(guo)程(cheng)的(de)主要部分(fen)(fen)。工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)又(you)可分(fen)(fen)為(wei)鑄造(zao)、鍛造(zao)、沖壓、焊接、機(ji)械(xie)加(jia)工(gong)(gong)、裝配等工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)，機(ji)械(xie)制造(zao)工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)一般是指零件的(de)機(ji)械(xie)加(jia)工(gong)(gong)工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)和(he)機(ji)器(qi)的(de)裝配工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)的(de)總和(he)，其他過(guo)(guo)(guo)(guo)(guo)程(cheng)則稱為(wei)輔(fu)助過(guo)(guo)(guo)(guo)(guo)程(cheng)，例如運輸、保管(guan)、動力供應、設(she)備(bei)維(wei)修等。工(gong)(gong)藝(yi)過(guo)(guo)(guo)(guo)(guo)程(cheng)又(you)是由一個(ge)或(huo)(huo)若(ruo)干個(ge)順序(xu)排(pai)列的(de)工(gong)(gong)序(xu)組(zu)成(cheng)(cheng)的(de)，一個(ge)工(gong)(gong)序(xu)由有若(ruo)干個(ge)工(gong)(gong)步組(zu)成(cheng)(cheng)。