機(ji)械加(jia)工(gong)是指通過一種機(ji)械設備對工(gong)件的外形尺寸或性能進行改變的過程。按加(jia)工(gong)方式上(shang)的差別(bie)可(ke)分為(wei)切削(xue)加(jia)工(gong)和壓力(li)加(jia)工(gong)。

在生產過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)中，凡是改變(bian)生產對(dui)象(xiang)的形狀、尺寸、位置和性質(zhi)等(deng)(deng)，使其成(cheng)(cheng)為(wei)(wei)成(cheng)(cheng)品或者(zhe)半成(cheng)(cheng)品的過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)稱(cheng)為(wei)(wei)工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)。它是生產過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)的主(zhu)要(yao)部分。工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)又(you)可分為(wei)(wei)鑄造、鍛造、沖壓、焊接(jie)、機械加工(gong)(gong)、裝配(pei)(pei)等(deng)(deng)工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)，機械制造工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)一(yi)般(ban)是指零件的機械加工(gong)(gong)工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)和機器的裝配(pei)(pei)工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)的總和，其他(ta)過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)則稱(cheng)為(wei)(wei)輔助過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)，例如運(yun)輸、保管(guan)、動力供(gong)應(ying)、設備維修等(deng)(deng)。工(gong)(gong)藝過(guo)(guo)(guo)(guo)程(cheng)(cheng)(cheng)(cheng)(cheng)又(you)是由一(yi)個(ge)或若(ruo)干個(ge)順(shun)序排列(lie)的工(gong)(gong)序組成(cheng)(cheng)的，一(yi)個(ge)工(gong)(gong)序由有若(ruo)干個(ge)工(gong)(gong)步組成(cheng)(cheng)。