機械(xie)加(jia)工是(shi)指通過一種機械(xie)設備對(dui)工件的(de)外形尺寸或性(xing)能(neng)進(jin)行改變的(de)過程。按(an)加(jia)工方(fang)式(shi)上的(de)差別可分為切削加(jia)工和壓力加(jia)工。

在生產過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)中，凡是(shi)(shi)改變生產對象的(de)形狀、尺寸(cun)、位置(zhi)和性質等(deng)，使其成(cheng)為成(cheng)品或者半成(cheng)品的(de)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)稱(cheng)為工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)。它(ta)是(shi)(shi)生產過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)的(de)主要部(bu)分。工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)又可分為鑄造(zao)、鍛(duan)造(zao)、沖壓、焊接(jie)、機(ji)械加工(gong)(gong)(gong)、裝(zhuang)配等(deng)工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)，機(ji)械制造(zao)工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)一(yi)般是(shi)(shi)指零件的(de)機(ji)械加工(gong)(gong)(gong)工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)和機(ji)器的(de)裝(zhuang)配工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)的(de)總和，其他過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)則稱(cheng)為輔助過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)，例如(ru)運輸、保(bao)管、動力供應、設備(bei)維修等(deng)。工(gong)(gong)(gong)藝(yi)(yi)過(guo)(guo)(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)又是(shi)(shi)由一(yi)個或若干個順序(xu)排列的(de)工(gong)(gong)(gong)序(xu)組(zu)成(cheng)的(de)，一(yi)個工(gong)(gong)(gong)序(xu)由有若干個工(gong)(gong)(gong)步(bu)組(zu)成(cheng)。