加工(gong)(gong)(gong)(gong)中心(xin)是(shi)(shi)指不(bu)帶刀庫的(de)數控機床(chuang)，帶刀庫的(de)加工(gong)(gong)(gong)(gong)中心(xin)又叫加工(gong)(gong)(gong)(gong)中心(xin)，加工(gong)(gong)(gong)(gong)步(bu)驟主(zhu)要(yao)為工(gong)(gong)(gong)(gong)藝分析、數學計(ji)算、編程及模擬(ni)、對(dui)刀、試(shi)切、正式加工(gong)(gong)(gong)(gong)等環節(jie)(jie)。其中，對(dui)刀是(shi)(shi)保證加工(gong)(gong)(gong)(gong)中心(xin)加工(gong)(gong)(gong)(gong)質量的(de)重要(yao)環節(jie)(jie)，其準確性直接影響(xiang)零件的(de)加工(gong)(gong)(gong)(gong)精度。

加(jia)工(gong)中(zhong)(zhong)心坐(zuo)(zuo)(zuo)標系分為機(ji)床(chuang)(chuang)坐(zuo)(zuo)(zuo)標系和機(ji)械(xie)(xie)坐(zuo)(zuo)(zuo)標系兩種，機(ji)床(chuang)(chuang)坐(zuo)(zuo)(zuo)標系是以機(ji)床(chuang)(chuang)參考(kao)點(dian)作(zuo)為坐(zuo)(zuo)(zuo)標原點(dian)建立的坐(zuo)(zuo)(zuo)標系，而機(ji)械(xie)(xie)坐(zuo)(zuo)(zuo)標值才是判斷刀具位置的重要依據(ju)。對(dui)于(yu)加(jia)工(gong)中(zhong)(zhong)心來(lai)說，由于(yu)工(gong)件(jian)(jian)(jian)原點(dian)是一個(ge)“動”點(dian)，只有確定工(gong)件(jian)(jian)(jian)原點(dian)的機(ji)械(xie)(xie)坐(zuo)(zuo)(zuo)標值才能將編制程序準確運用(yong)到加(jia)工(gong)中(zhong)(zhong)心加(jia)工(gong)當(dang)中(zhong)(zhong)，確定工(gong)件(jian)(jian)(jian)原點(dian)的機(ji)械(xie)(xie)坐(zuo)(zuo)(zuo)標值需要通過對(dui)刀來(lai)實現。