機械(xie)加(jia)(jia)工(gong)是指(zhi)通過一種機械(xie)設(she)備(bei)對(dui)工(gong)件的外形尺寸(cun)或性能進(jin)行(xing)改變的過程。按(an)加(jia)(jia)工(gong)方式上的差別可分(fen)為切削加(jia)(jia)工(gong)和(he)壓力加(jia)(jia)工(gong)。

在生產(chan)(chan)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)中，凡是(shi)改變生產(chan)(chan)對象的(de)(de)(de)(de)形(xing)狀、尺寸、位置和(he)性質等(deng)，使(shi)其(qi)成為成品或者半成品的(de)(de)(de)(de)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)稱(cheng)為工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)。它是(shi)生產(chan)(chan)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)主要(yao)部(bu)分。工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)又可分為鑄造(zao)、鍛造(zao)、沖壓、焊接(jie)、機(ji)械(xie)(xie)加(jia)工(gong)(gong)、裝配等(deng)工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)，機(ji)械(xie)(xie)制造(zao)工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)一(yi)(yi)般是(shi)指零件的(de)(de)(de)(de)機(ji)械(xie)(xie)加(jia)工(gong)(gong)工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)和(he)機(ji)器的(de)(de)(de)(de)裝配工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)總和(he)，其(qi)他(ta)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)則稱(cheng)為輔助過(guo)(guo)(guo)程(cheng)(cheng)(cheng)，例(li)如運輸、保管、動力供應、設(she)備維修(xiu)等(deng)。工(gong)(gong)藝(yi)(yi)(yi)過(guo)(guo)(guo)程(cheng)(cheng)(cheng)又是(shi)由(you)一(yi)(yi)個或若干個順(shun)序排列的(de)(de)(de)(de)工(gong)(gong)序組成的(de)(de)(de)(de)，一(yi)(yi)個工(gong)(gong)序由(you)有若干個工(gong)(gong)步組成。