金屬零件加工是(shi)一(yi)種用(yong)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)機(ji)械(xie)對工(gong)(gong)(gong)(gong)(gong)件(jian)的(de)(de)外(wai)形尺寸或(huo)性(xing)能進行改變的(de)(de)過程。按被加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)的(de)(de)工(gong)(gong)(gong)(gong)(gong)件(jian)處于的(de)(de)溫度(du)狀(zhuang)態﹐分(fen)為冷(leng)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)和(he)熱(re)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)。 冷(leng)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)一(yi)般(ban)在(zai)常(chang)溫下(xia)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong),并且不引起工(gong)(gong)(gong)(gong)(gong)件(jian)的(de)(de)化學或(huo)物相變化﹐稱冷(leng)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)。冷(leng)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)按加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)方式的(de)(de)差別可分(fen)為切削(xue)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)和(he)壓力加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)。 熱(re)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)一(yi)般(ban)在(zai)高于或(huo)低于常(chang)溫狀(zhuang)態的(de)(de)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)﹐會引起工(gong)(gong)(gong)(gong)(gong)件(jian)的(de)(de)化學或(huo)物相變化﹐稱熱(re)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)。熱(re)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)常(chang)見有熱(re)處理(li)﹐煅造﹐鑄造和(he)焊接。 　

 金(jin)屬(shu)(shu)零(ling)件，指以金(jin)屬(shu)(shu)材(cai)料來制造的(de)各(ge)種規格與形狀(zhuang)的(de)金(jin)屬(shu)(shu)塊、金(jin)屬(shu)(shu)棒、金(jin)屬(shu)(shu)管等(deng)的(de)合稱(cheng)。