在加(jia)(jia)(jia)工(gong)(gong)中心中，數控車床(chuang)的加(jia)(jia)(jia)工(gong)(gong)一般(ban)需求運(yun)用多把(ba)刀具(ju)，所以(yi)我們(men)要合理安(an)排(pai)加(jia)(jia)(jia)工(gong)(gong)次(ci)(ci)第，這(zhe)樣有利(li)于進步加(jia)(jia)(jia)工(gong)(gong)精度、加(jia)(jia)(jia)工(gong)(gong)功率(lv)及經(jing)濟效益。在安(an)排(pai)數控車床(chuang)加(jia)(jia)(jia)工(gong)(gong)次(ci)(ci)第時相同(tong)要遵(zun)照(zhao)""基面先(xian)(xian)行""、""先(xian)(xian)面后(hou)孔(kong)""、""先(xian)(xian)主后(hou)次(ci)(ci)""及""先(xian)(xian)粗后(hou)精""的一般(ban)工(gong)(gong)藝原則。

    定位(wei)基(ji)(ji)(ji)準(zhun)(zhun)的(de)(de)選(xuan)(xuan)擇直接(jie)影響到(dao)加工(gong)(gong)(gong)次(ci)第(di)的(de)(de)安排(pai)，作為(wei)定位(wei)基(ji)(ji)(ji)準(zhun)(zhun)的(de)(de)面應(ying)先加工(gong)(gong)(gong)好(hao)，以便(bian)為(wei)加工(gong)(gong)(gong)其他面供(gong)給(gei)一(yi)個可(ke)(ke)靠的(de)(de)定位(wei)基(ji)(ji)(ji)準(zhun)(zhun)。因為(wei)本道工(gong)(gong)(gong)序選(xuan)(xuan)出(chu)(chu)定位(wei)基(ji)(ji)(ji)準(zhun)(zhun)后加工(gong)(gong)(gong)出(chu)(chu)的(de)(de)表面，有可(ke)(ke)能是(shi)下道工(gong)(gong)(gong)序的(de)(de)定位(wei)基(ji)(ji)(ji)準(zhun)(zhun)，所以待各加工(gong)(gong)(gong)工(gong)(gong)(gong)序的(de)(de)定位(wei)基(ji)(ji)(ji)準(zhun)(zhun)判定之(zhi)后，即(ji)可(ke)(ke)從畢(bi)竟(jing)精加工(gong)(gong)(gong)工(gong)(gong)(gong)序向前逐級倒推出(chu)(chu)整個工(gong)(gong)(gong)序的(de)(de)大致次(ci)第(di)。

    判(pan)定數控車床的(de)(de)加(jia)(jia)(jia)工次第時(shi)，還要先清(qing)晰零件是否要進行加(jia)(jia)(jia)工前的(de)(de)預加(jia)(jia)(jia)工。預加(jia)(jia)(jia)工常由一般機床結束。若(ruo)毛坯精度較高(gao)，定位(wei)也較可(ke)靠，或(huo)加(jia)(jia)(jia)工余量(liang)充分(fen)且均勻，則可(ke)不必(bi)進行預加(jia)(jia)(jia)工，而直(zhi)接(jie)在(zai)加(jia)(jia)(jia)工中心上加(jia)(jia)(jia)工。這時(shi)，要根據毛坯粗基準(zhun)的(de)(de)精度考慮加(jia)(jia)(jia)工中心工序(xu)的(de)(de)區(qu)別，可(ke)所(suo)以一道(dao)工序(xu)或(huo)分(fen)紅幾道(dao)工序(xu)來(lai)結束。

    數(shu)(shu)控(kong)車(che)床加(jia)工(gong)(gong)零(ling)件時(shi)，難(nan)保(bao)證(zheng)的(de)(de)是加(jia)工(gong)(gong)面與非加(jia)工(gong)(gong)面之間的(de)(de)標準(zhun)，這一點和(he)數(shu)(shu)控(kong)銑削(xue)相同。因(yin)此，即使圖(tu)樣要求的(de)(de)對錯加(jia)工(gong)(gong)面，也****在制(zhi)造毛坯時(shi)在非加(jia)工(gong)(gong)面上(shang)添加(jia)恰當(dang)的(de)(de)余(yu)量，以(yi)便在加(jia)工(gong)(gong)中(zhong)心加(jia)工(gong)(gong)時(shi)，保(bao)證(zheng)非加(jia)工(gong)(gong)面與加(jia)工(gong)(gong)面間的(de)(de)標準(zhun)符合(he)圖(tu)樣要求。

    相同，若(ruo)數(shu)控車床(chuang)加(jia)(jia)工(gong)(gong)前的預加(jia)(jia)工(gong)(gong)面(mian)與加(jia)(jia)工(gong)(gong)中心所加(jia)(jia)工(gong)(gong)的面(mian)之間有標準要求，則也應(ying)在預加(jia)(jia)工(gong)(gong)時留必定(ding)的加(jia)(jia)工(gong)(gong)余(yu)量，在加(jia)(jia)工(gong)(gong)中心的一次(ci)裝(zhuang)夾(jia)中結束包括(kuo)預加(jia)(jia)工(gong)(gong)面(mian)在內(nei)的一切加(jia)(jia)工(gong)(gong)內(nei)容(rong)。