零件(jian)加(jia)(jia)(jia)工(gong)表(biao)面(mian)(mian)(mian)上，不應有(you)(you)劃痕、擦傷等損(sun)傷零件(jian)表(biao)面(mian)(mian)(mian)的(de)(de)缺(que)陷，加(jia)(jia)(jia)工(gong)的(de)(de)螺紋表(biao)面(mian)(mian)(mian)不允許(xu)有(you)(you)黑皮、磕(ke)碰、亂扣(kou)和毛刺等缺(que)陷。所有(you)(you)需要進(jin)行(xing)涂裝的(de)(de)鋼鐵制件(jian)表(biao)面(mian)(mian)(mian)在涂漆(qi)前，大型機(ji)械(xie)加(jia)(jia)(jia)工(gong)，必須將鐵銹(xiu)、氧化皮、油脂、灰塵、泥土、鹽和污物(wu)等除去。在進(jin)行(xing)機(ji)械(xie)加(jia)(jia)(jia)工(gong)的(de)(de)時候，學會對(dui)零部件(jian)的(de)(de)精度進(jin)行(xing)控制是(shi)很有(you)(you)必要的(de)(de)一件(jian)事情，因為只有(you)(you)精度得到(dao)控制以后，才(cai)能(neng)夠(gou)讓加(jia)(jia)(jia)工(gong)出來的(de)(de)零部件(jian)更能(neng)夠(gou)滿(man)足精密需求。機(ji)械(xie)加(jia)(jia)(jia)工(gong)是(shi)通過(guo)機(ji)械(xie)設備對(dui)工(gong)件(jian)的(de)(de)外形(xing)尺寸或性能(neng)進(jin)行(xing)改變的(de)(de)加(jia)(jia)(jia)工(gong)過(guo)程，機(ji)械(xie)加(jia)(jia)(jia)工(gong)對(dui)現代工(gong)業生產起(qi)到(dao)了非常重要的(de)(de)作用。

機(ji)械(xie)(xie)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)具(ju)備著非常(chang)(chang)靈活的(de)(de)(de)(de)制(zhi)造能(neng)力(li)，機(ji)械(xie)(xie)精(jing)密(mi)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)，還能(neng)大批量生(sheng)產，可(ke)(ke)以生(sheng)產出非常(chang)(chang)精(jing)密(mi)的(de)(de)(de)(de)機(ji)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)零件，可(ke)(ke)以在很(hen)短的(de)(de)(de)(de)時間里面生(sheng)產出完全不同的(de)(de)(de)(de)產品(pin)(pin)。機(ji)械(xie)(xie)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)是(shi)一(yi)(yi)種(zhong)用加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)機(ji)械(xie)(xie)對工(gong)(gong)(gong)(gong)(gong)(gong)件的(de)(de)(de)(de)外形(xing)尺(chi)寸或(huo)性能(neng)進行(xing)改變的(de)(de)(de)(de)過程。按被加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)的(de)(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)件處于(yu)的(de)(de)(de)(de)溫度(du)狀態﹐分為冷加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)和熱加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)。產品(pin)(pin)在加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)的(de)(de)(de)(de)時候(hou)，根據不同的(de)(de)(de)(de)產品(pin)(pin)要求(qiu)要進行(xing)不同程度(du)的(de)(de)(de)(de)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)，加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)程度(du)需要進行(xing)劃(hua)分，如(ru)果對精(jing)度(du)要求(qiu)不高，那么進行(xing)一(yi)(yi)個(ge)簡單的(de)(de)(de)(de)粗加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)階段(duan)就行(xing)了。產品(pin)(pin)的(de)(de)(de)(de)進度(du)要求(qiu)越來越嚴格，機(ji)械(xie)(xie)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)廠家(jia)，后(hou)續就要進行(xing)半精(jing)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)和精(jing)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)階段(duan)。

機(ji)械加(jia)(jia)(jia)工(gong)(gong)(gong)的(de)精(jing)度(du)(du)(du)，主(zhu)要是(shi)體現在以(yi)下(xia)這(zhe)幾(ji)個方(fang)面，為尺寸精(jing)度(du)(du)(du)、幾(ji)何形(xing)狀精(jing)度(du)(du)(du)和相互位置精(jing)度(du)(du)(du)，其中幾(ji)何形(xing)狀精(jing)度(du)(du)(du)包括(kuo)圓度(du)(du)(du)、直線度(du)(du)(du)以(yi)及(ji)平(ping)面度(du)(du)(du)等，相互位置精(jing)度(du)(du)(du)包括(kuo)平(ping)行度(du)(du)(du)、垂直度(du)(du)(du)以(yi)及(ji)同軸度(du)(du)(du)等。零部(bu)(bu)件上面有(you)多(duo)個型(xing)腔(qiang)(qiang)，加(jia)(jia)(jia)工(gong)(gong)(gong)的(de)時(shi)候，不(bu)宜采用一個型(xing)腔(qiang)(qiang)一個型(xing)腔(qiang)(qiang)的(de)加(jia)(jia)(jia)工(gong)(gong)(gong)方(fang)式(shi)進行加(jia)(jia)(jia)工(gong)(gong)(gong)排(pai)列，這(zhe)樣(yang)很容易造成零部(bu)(bu)件受力不(bu)均(jun)勻而(er)產生(sheng)變形(xing)，采用分層(ceng)多(duo)次(ci)加(jia)(jia)(jia)工(gong)(gong)(gong)，合肥機(ji)械加(jia)(jia)(jia)工(gong)(gong)(gong)，每(mei)一層(ceng)盡量同時(shi)加(jia)(jia)(jia)工(gong)(gong)(gong)到所有(you)的(de)型(xing)腔(qiang)(qiang)，然后在加(jia)(jia)(jia)工(gong)(gong)(gong)上下(xia)一個層(ceng)次(ci)，讓零件均(jun)勻受力減小發(fa)生(sheng)形(xing)變的(de)概率。精(jing)密零件加(jia)(jia)(jia)工(gong)(gong)(gong)其實(shi)是(shi)機(ji)械加(jia)(jia)(jia)工(gong)(gong)(gong)的(de)一種，但(dan)是(shi)因為對零件的(de)加(jia)(jia)(jia)工(gong)(gong)(gong)精(jing)密度(du)(du)(du)較(jiao)高(gao)(gao)，對生(sheng)產機(ji)械及(ji)流程要求(qiu)也比較(jiao)高(gao)(gao)。隨(sui)著工(gong)(gong)(gong)業化發(fa)展，精(jing)密機(ji)械加(jia)(jia)(jia)工(gong)(gong)(gong)分類越(yue)來(lai)越(yue)多(duo)，方(fang)向(xiang)越(yue)來(lai)越(yue)細，越(yue)來(lai)越(yue)化。