隨著各種各樣的加工技術，出現在市場上，它們的出現，被我們慢慢的所熟知，或者是認識，在工業中，CNC加工還是所使用的比較多的一種加工技術。但據很多用戶反映，生產時會在CNC加工件上留加工余量，為什么要這么操作呢？以下是鈦加工件公司介紹給大家。

　　CNC加(jia)工(gong)各工(gong)序切除的(de)(de)金屬(shu)層(ceng)厚度(du)稱(cheng)為(wei)(wei)工(gong)序間加(jia)工(gong)余(yu)(yu)量(liang)。對于外(wai)圓和孔(kong)等扭轉(zhuan)外(wai)，加(jia)工(gong)余(yu)(yu)量(liang)從直徑考(kao)慮，因此稱(cheng)為(wei)(wei)對稱(cheng)余(yu)(yu)量(liang)(即雙方余(yu)(yu)量(liang))，即實際(ji)切除的(de)(de)金屬(shu)層(ceng)厚度(du)為(wei)(wei)直徑加(jia)工(gong)余(yu)(yu)量(liang)的(de)(de)一半。平面的(de)(de)加(jia)工(gong)余(yu)(yu)量(liang)則是單邊余(yu)(yu)量(liang)，它便是實際(ji)所切除的(de)(de)金屬(shu)層(ceng)厚度(du)。

　　工(gong)(gong)件殘留加(jia)(jia)工(gong)(gong)余量的(de)目標是(shi)切(qie)除上(shang)一工(gong)(gong)序殘留的(de)加(jia)(jia)工(gong)(gong)誤(wu)差和外(wai)(wai)部缺陷(xian)，如鑄件外(wai)(wai)冷硬層、氣孔、夾層、鍛件外(wai)(wai)氧(yang)化皮、脫碳(tan)層、外(wai)(wai)裂、切(qie)削加(jia)(jia)工(gong)(gong)后(hou)的(de)內應力層和外(wai)(wai)部粗糙(cao)度等。然后(hou)，提高工(gong)(gong)件的(de)精度和外(wai)(wai)部粗糙(cao)度。加(jia)(jia)工(gong)(gong)余量的(de)巨細對(dui)加(jia)(jia)工(gong)(gong)質量和生產能力有很大影響(xiang)。

　　加工(gong)(gong)(gong)(gong)余量過大，不只(zhi)增加了(le)(le)機械(xie)加工(gong)(gong)(gong)(gong)的(de)勞動量，降低了(le)(le)生產率，而(er)且增加了(le)(le)材料、目標和(he)電(dian)力耗費，CNC加工(gong)(gong)(gong)(gong)進步了(le)(le)加工(gong)(gong)(gong)(gong)本錢。若加工(gong)(gong)(gong)(gong)余量太小，則既來(lai)不及打消(xiao)上(shang)道(dao)工(gong)(gong)(gong)(gong)序(xu)的(de)各(ge)類(lei)缺(que)陷和(he)誤差，又來(lai)不及補償本工(gong)(gong)(gong)(gong)序(xu)加工(gong)(gong)(gong)(gong)時的(de)裝夾(jia)誤差，構成廢品。其標準是在確保質量的(de)CNC加工(gong)(gong)(gong)(gong)下(xia)，盡(jin)量減(jian)少(shao)(shao)余量。一般來(lai)說，加工(gong)(gong)(gong)(gong)越(yue)多，工(gong)(gong)(gong)(gong)序(xu)余量越(yue)少(shao)(shao)。

　　確定(ding)CNC加(jia)工(gong)(gong)(gong)順序(xu)(xu)時(shi)，必須明確零件是否加(jia)工(gong)(gong)(gong)前的(de)(de)預(yu)加(jia)工(gong)(gong)(gong)。預(yu)加(jia)工(gong)(gong)(gong)常由普通機床(chuang)完結。若毛坯精(jing)度(du)較高，定(ding)位也較可靠，或加(jia)工(gong)(gong)(gong)余量(liang)充沛且(qie)均(jun)勻，則可不用進(jin)行(xing)預(yu)加(jia)工(gong)(gong)(gong)，而直接在數控(kong)機床(chuang)上加(jia)工(gong)(gong)(gong)。這時(shi)，要根據毛坯粗基準的(de)(de)精(jing)度(du)考慮(lv)數控(kong)機床(chuang)工(gong)(gong)(gong)序(xu)(xu)的(de)(de)區(qu)分(fen)(fen)，所以一道工(gong)(gong)(gong)序(xu)(xu)或分(fen)(fen)成(cheng)幾道工(gong)(gong)(gong)序(xu)(xu)來完結。