零(ling)件加(jia)(jia)工(gong)的幾何形(xing)狀(zhuang)精度(du)主要(yao)(yao)是(shi)(shi)指軸頸、外錐面、莫氏錐孔等的圓(yuan)度(du)、圓(yuan)柱度(du)等，一般應將(jiang)其公(gong)差限制在(zai)尺(chi)寸(cun)公(gong)差范圍內(nei)。對(dui)精度(du)要(yao)(yao)求(qiu)(qiu)較(jiao)高(gao)(gao)的內(nei)外圓(yuan)表(biao)面，應在(zai)圖(tu)紙上標(biao)注其允許(xu)偏差。產品(pin)(pin)在(zai)加(jia)(jia)工(gong)的時候，根據(ju)不同的產品(pin)(pin)要(yao)(yao)求(qiu)(qiu)要(yao)(yao)進行不同程度(du)的加(jia)(jia)工(gong)，加(jia)(jia)工(gong)程度(du)需要(yao)(yao)進行劃分，如果對(dui)精度(du)要(yao)(yao)求(qiu)(qiu)不高(gao)(gao)，那么進行一個(ge)簡單的粗(cu)加(jia)(jia)工(gong)階段就(jiu)行了。產品(pin)(pin)的進度(du)要(yao)(yao)求(qiu)(qiu)越來越嚴格，后續就(jiu)要(yao)(yao)進行半精加(jia)(jia)工(gong)和(he)(he)精加(jia)(jia)工(gong)階段。機械加(jia)(jia)工(gong)以后的零(ling)部(bu)件放(fang)在(zai)含有磨塊或者(zhe)是(shi)(shi)磨劑的滾筒當中，在(zai)里面會(hui)(hui)進行復雜的運動，而(er)運動的過程當中會(hui)(hui)產生壓(ya)力(li)(li)，機械加(jia)(jia)工(gong)廠，產生壓(ya)力(li)(li)會(hui)(hui)出現碰撞和(he)(he)滾壓(ya)，這樣就(jiu)會(hui)(hui)讓(rang)零(ling)部(bu)件的表(biao)面起到輕(qing)微磨削(xue)的效果，自然也(ye)就(jiu)能(neng)夠實現讓(rang)它的表(biao)面慢(man)慢(man)被細化，表(biao)面也(ye)會(hui)(hui)因此(ci)變得(de)光整很(hen)多。

產(chan)品(pin)(pin)在(zai)加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)時(shi)候，根(gen)據不(bu)同(tong)的(de)產(chan)品(pin)(pin)要求(qiu)要進行(xing)不(bu)同(tong)程度(du)的(de)加(jia)工(gong)(gong)(gong)(gong)(gong)，加(jia)工(gong)(gong)(gong)(gong)(gong)程度(du)需要進行(xing)劃(hua)分(fen)，如果對精度(du)要求(qiu)不(bu)高(gao)，機(ji)(ji)械精密加(jia)工(gong)(gong)(gong)(gong)(gong)，那么進行(xing)一個簡(jian)單的(de)粗(cu)加(jia)工(gong)(gong)(gong)(gong)(gong)階(jie)(jie)段就(jiu)行(xing)了。產(chan)品(pin)(pin)的(de)進度(du)要求(qiu)越(yue)來越(yue)嚴格，后續就(jiu)要進行(xing)半精加(jia)工(gong)(gong)(gong)(gong)(gong)和精加(jia)工(gong)(gong)(gong)(gong)(gong)階(jie)(jie)段。零(ling)部件(jian)(jian)上(shang)面(mian)(mian)有多(duo)個型(xing)腔，加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)時(shi)候，不(bu)宜采(cai)用一個型(xing)腔一個型(xing)腔的(de)加(jia)工(gong)(gong)(gong)(gong)(gong)方(fang)式進行(xing)加(jia)工(gong)(gong)(gong)(gong)(gong)排列，這樣很容易造(zao)成零(ling)部件(jian)(jian)受力不(bu)均(jun)勻(yun)(yun)而產(chan)生變形，機(ji)(ji)械加(jia)工(gong)(gong)(gong)(gong)(gong)廠家，采(cai)用分(fen)層(ceng)(ceng)多(duo)次加(jia)工(gong)(gong)(gong)(gong)(gong)，每一層(ceng)(ceng)盡量(liang)同(tong)時(shi)加(jia)工(gong)(gong)(gong)(gong)(gong)到(dao)所有的(de)型(xing)腔，然后在(zai)加(jia)工(gong)(gong)(gong)(gong)(gong)上(shang)下一個層(ceng)(ceng)次，讓零(ling)件(jian)(jian)均(jun)勻(yun)(yun)受力減小(xiao)發生形變的(de)概率。機(ji)(ji)械加(jia)工(gong)(gong)(gong)(gong)(gong)具備著非常靈活(huo)的(de)制造(zao)能力，還能大批量(liang)生產(chan)，可(ke)以(yi)生產(chan)出(chu)非常精密的(de)機(ji)(ji)加(jia)工(gong)(gong)(gong)(gong)(gong)零(ling)件(jian)(jian)，可(ke)以(yi)在(zai)很短(duan)的(de)時(shi)間里(li)面(mian)(mian)生產(chan)出(chu)完全不(bu)同(tong)的(de)產(chan)品(pin)(pin)。

機(ji)械(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)優(you)勢：機(ji)械(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)不需要(yao)開模，且自由度(du)(du)高；機(ji)械(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)精度(du)(du)非常高，合(he)(he)肥機(ji)械(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)，有(you)利于(yu)提(ti)高工(gong)(gong)(gong)件質量；機(ji)械(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)，有(you)利于(yu)提(ti)高產量。機(ji)械(xie)(xie)零件加(jia)(jia)工(gong)(gong)(gong)上(shang)的(de)(de)點、線(xian)、面的(de)(de)實際位置與理想位置的(de)(de)符(fu)合(he)(he)程(cheng)度(du)(du)。評定(ding)位置精度(du)(du)的(de)(de)項(xiang)(xiang)目(mu)按GB/T1182—1996規(gui)定(ding)，有(you)平行(xing)(xing)度(du)(du)、垂直度(du)(du)、傾(qing)斜度(du)(du)、同軸度(du)(du)、對稱度(du)(du)、位置度(du)(du)、圓跳(tiao)動和全跳(tiao)動等8項(xiang)(xiang)。位置精度(du)(du)是(shi)用位置誤(wu)差來控制的(de)(de)，各項(xiang)(xiang)目(mu)的(de)(de)位置公差分(fen)為12個(ge)精度(du)(du)等級。進行(xing)(xing)機(ji)械(xie)(xie)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)時候(hou)一定(ding)要(yao)先將其毛刺或者是(shi)磕碰傷情況(kuang)解決以(yi)后再放入到里(li)面，這樣就能夠(gou)減少(shao)齒輪傳動噪音(yin)的(de)(de)出現。