機械加(jia)工(gong)(gong)(gong)是指通過一種機械設備對(dui)工(gong)(gong)(gong)件的(de)外形尺寸或性(xing)能進行改變的(de)過程(cheng)。按(an)加(jia)工(gong)(gong)(gong)方式(shi)上的(de)差別可分為(wei)切(qie)削加(jia)工(gong)(gong)(gong)和壓(ya)力(li)加(jia)工(gong)(gong)(gong)。

在生產過(guo)程(cheng)(cheng)(cheng)中，凡(fan)是(shi)改變生產對(dui)象的(de)(de)(de)形狀(zhuang)、尺寸、位置(zhi)和性質等(deng)(deng)，使(shi)其成(cheng)(cheng)為成(cheng)(cheng)品或者半成(cheng)(cheng)品的(de)(de)(de)過(guo)程(cheng)(cheng)(cheng)稱(cheng)為工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)。它是(shi)生產過(guo)程(cheng)(cheng)(cheng)的(de)(de)(de)主要部分(fen)(fen)。工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)又(you)可分(fen)(fen)為鑄造(zao)、鍛造(zao)、沖壓、焊接、機(ji)(ji)械(xie)加工(gong)(gong)(gong)、裝(zhuang)配等(deng)(deng)工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)，機(ji)(ji)械(xie)制造(zao)工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)一般是(shi)指零件的(de)(de)(de)機(ji)(ji)械(xie)加工(gong)(gong)(gong)工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)和機(ji)(ji)器的(de)(de)(de)裝(zhuang)配工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)的(de)(de)(de)總和，其他過(guo)程(cheng)(cheng)(cheng)則(ze)稱(cheng)為輔助過(guo)程(cheng)(cheng)(cheng)，例如(ru)運(yun)輸、保管(guan)、動力供應、設備維修等(deng)(deng)。工(gong)(gong)(gong)藝(yi)(yi)(yi)過(guo)程(cheng)(cheng)(cheng)又(you)是(shi)由一個(ge)(ge)或若(ruo)干個(ge)(ge)順(shun)序排列的(de)(de)(de)工(gong)(gong)(gong)序組成(cheng)(cheng)的(de)(de)(de)，一個(ge)(ge)工(gong)(gong)(gong)序由有若(ruo)干個(ge)(ge)工(gong)(gong)(gong)步組成(cheng)(cheng)。