精(jing)密(mi)(mi)零部件(jian)(jian)加(jia)工(gong)(gong)的(de)(de)(de)定義是(shi)，按步驟(zou)，按工(gong)(gong)序完成各(ge)主要(yao)表(biao)面(mian)的(de)(de)(de)終加(jia)工(gong)(gong)，包括工(gong)(gong)件(jian)(jian)平行(xing)度，表(biao)面(mian)光潔度，表(biao)面(mian)垂直(zhi)度，表(biao)面(mian)硬度等(deng)等(deng)，使零件(jian)(jian)的(de)(de)(de)加(jia)工(gong)(gong)精(jing)度和加(jia)工(gong)(gong)表(biao)面(mian)質量(liang)達到圖樣規定的(de)(de)(de)要(yao)求的(de)(de)(de)過程(cheng)。機(ji)(ji)械加(jia)工(gong)(gong)基(ji)(ji)準按其作用(yong)不同，可(ke)分為設計(ji)基(ji)(ji)準和工(gong)(gong)藝基(ji)(ji)準兩大類(lei)。設計(ji)基(ji)(ji)準在零件(jian)(jian)圖上用(yong)以確定其他(ta)點(dian)、線(xian)、面(mian)的(de)(de)(de)基(ji)(ji)準，合肥機(ji)(ji)械加(jia)工(gong)(gong)，稱為設計(ji)基(ji)(ji)準，就活(huo)(huo)塞(sai)來說，設計(ji)基(ji)(ji)準指(zhi)活(huo)(huo)塞(sai)中心線(xian)和銷(xiao)孔(kong)中心線(xian)。機(ji)(ji)械加(jia)工(gong)(gong)具備著非(fei)常靈活(huo)(huo)的(de)(de)(de)制造能(neng)力，還能(neng)大批量(liang)生(sheng)產，可(ke)以生(sheng)產出非(fei)常精(jing)密(mi)(mi)的(de)(de)(de)機(ji)(ji)加(jia)工(gong)(gong)零件(jian)(jian)，機(ji)(ji)械精(jing)密(mi)(mi)加(jia)工(gong)(gong)，可(ke)以在很短的(de)(de)(de)時間里面(mian)生(sheng)產出完全不同的(de)(de)(de)產品。

機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)零件(jian)(jian)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)變(bian)(bian)形(xing)(xing)的(de)改(gai)(gai)進(jin)措施(shi)：在(zai)(zai)實際的(de)機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)零件(jian)(jian)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)中，機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)廠家，導(dao)致(zhi)零件(jian)(jian)變(bian)(bian)形(xing)(xing)的(de)因(yin)素(su)很多。為了從(cong)根(gen)本上解(jie)決這些(xie)變(bian)(bian)形(xing)(xing)問(wen)題，操作(zuo)人(ren)員需要在(zai)(zai)實際工(gong)(gong)(gong)(gong)(gong)作(zuo)中認(ren)真探索(suo)這些(xie)因(yin)素(su)，并結(jie)合工(gong)(gong)(gong)(gong)(gong)作(zuo)精要，制定改(gai)(gai)進(jin)措施(shi)。機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)是(shi)一種用加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)對(dui)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)的(de)外形(xing)(xing)尺寸(cun)或(huo)性能(neng)進(jin)行(xing)改(gai)(gai)變(bian)(bian)的(de)過(guo)程(cheng)。按被加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)的(de)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)處于的(de)溫度(du)狀態﹐分為冷加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)和熱(re)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)。機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)是(shi)通過(guo)機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)設備對(dui)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)的(de)外形(xing)(xing)尺寸(cun)或(huo)性能(neng)進(jin)行(xing)改(gai)(gai)變(bian)(bian)的(de)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)過(guo)程(cheng)，機(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)對(dui)現代工(gong)(gong)(gong)(gong)(gong)業生(sheng)產起到了非常重要的(de)作(zuo)用。

機械(xie)(xie)加工(gong)(gong)(gong)基(ji)(ji)(ji)準(zhun)按(an)其(qi)作(zuo)用(yong)不同(tong)，可分(fen)為設(she)計基(ji)(ji)(ji)準(zhun)和(he)工(gong)(gong)(gong)藝基(ji)(ji)(ji)準(zhun)兩大(da)類。設(she)計基(ji)(ji)(ji)準(zhun)在(zai)零(ling)件圖上用(yong)以確定其(qi)他點、線、面(mian)的(de)基(ji)(ji)(ji)準(zhun)，稱為設(she)計基(ji)(ji)(ji)準(zhun)，就(jiu)活塞來說，設(she)計基(ji)(ji)(ji)準(zhun)指活塞中心(xin)線和(he)銷(xiao)孔中心(xin)線。機械(xie)(xie)加工(gong)(gong)(gong)設(she)備使用(yong)的(de)材料須符合安(an)全環保要(yao)(yao)求(qiu)(qiu)，大(da)型機械(xie)(xie)加工(gong)(gong)(gong)廠家，不允(yun)許使用(yong)對(dui)人體有害(hai)和(he)未經(jing)安(an)全部門檢(jian)驗合格(ge)(ge)的(de)材料。產(chan)品(pin)(pin)在(zai)加工(gong)(gong)(gong)的(de)時(shi)候，根(gen)據不同(tong)的(de)產(chan)品(pin)(pin)要(yao)(yao)求(qiu)(qiu)要(yao)(yao)進(jin)(jin)行(xing)(xing)(xing)不同(tong)程(cheng)度的(de)加工(gong)(gong)(gong)，加工(gong)(gong)(gong)程(cheng)度需要(yao)(yao)進(jin)(jin)行(xing)(xing)(xing)劃(hua)分(fen)，如果對(dui)精度要(yao)(yao)求(qiu)(qiu)不高，那么進(jin)(jin)行(xing)(xing)(xing)一個簡單的(de)粗加工(gong)(gong)(gong)階段就(jiu)行(xing)(xing)(xing)了。產(chan)品(pin)(pin)的(de)進(jin)(jin)度要(yao)(yao)求(qiu)(qiu)越來越嚴格(ge)(ge)，后續就(jiu)要(yao)(yao)進(jin)(jin)行(xing)(xing)(xing)半精加工(gong)(gong)(gong)和(he)精加工(gong)(gong)(gong)階段。