確定道(dao)(dao)次加工(gong)率要保證軋(ya)制過(guo)程順利(li)進(jin)行；減少軋(ya)件的(de)不(bu)均勻變形，保證產(chan)品(pin)尺寸精度與板形的(de)要求；實現(xian)安全(quan)生產(chan)，充分(fen)發揮(hui)設(she)備能力。確定道(dao)(dao)次加工(gong)率，應考慮(lv)咬人(ren)條件、合(he)金的(de)高溫(wen)性能、產(chan)品(pin)質量要求及設(she)備能力。分(fen)配道(dao)(dao)次加工(gong)率受以下條件限制：

    3）軋(ya)(ya)機(ji)(ji)強度和電(dian)(dian)機(ji)(ji)能(neng)力(li)。熱軋(ya)(ya)中間各道次采(cai)用提高軋(ya)(ya)制速(su)度與(yu)進行大壓(ya)下量軋(ya)(ya)制、但必須保證設備安全運轉(zhuan)，軋(ya)(ya)制壓(ya)力(li)不超過(guo)軋(ya)(ya)機(ji)(ji)部件（主(zhu)要是軋(ya)(ya)輥(gun)）的許用壓(ya)力(li)，傳動負(fu)荷不應超過(guo)電(dian)(dian)機(ji)(ji)本身的允許電(dian)(dian)流及轉(zhuan)矩(ju)。同時，各道次電(dian)(dian)機(ji)(ji)負(fu)荷應盡可(ke)能(neng)均勻，以(yi)便充分利用電(dian)(dian)機(ji)(ji)能(neng)力(li)。

    （4）不同軋(ya)(ya)(ya)制(zhi)(zhi)階段(duan)道(dao)(dao)次(ci)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)確定原則是(shi)： 1）開始軋(ya)(ya)(ya)制(zhi)(zhi)階段(duan)，道(dao)(dao)次(ci)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)比較(jiao)(jiao)小(xiao)(xiao)，一般為(wei)2% ~ 10%,因為(wei)前幾道(dao)(dao)次(ci)主要是(shi)變鑄造組織(zhi)(zhi)為(wei)加(jia)(jia)工(gong)(gong)(gong)組織(zhi)(zhi)，滿足咬人條(tiao)件。對包鋁(lv)鑄錠，為(wei)了(le)使包鋁(lv)板與其(qi)(qi)基體金屬(shu)之間(jian)牢固(gu)焊合，頭(tou)道(dao)(dao)次(ci)的(de)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)應(ying)小(xiao)(xiao)于(yu)5%,采用較(jiao)(jiao)低(di)的(de)道(dao)(dao)次(ci)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)干(gan)壓(ya)(ya)3 ~5道(dao)(dao)次(ci)。2）中間(jian)軋(ya)(ya)(ya)制(zhi)(zhi)階段(duan)，隨金屬(shu)加(jia)(jia)工(gong)(gong)(gong)性能的(de)改(gai)善，如(ru)果設備條(tiao)件允許，應(ying)盡量加(jia)(jia)大道(dao)(dao)次(ci)變形(xing)量，對硬鋁(lv)合金道(dao)(dao)次(ci)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)可達45%以(yi)上(shang)，軟鋁(lv)合金可達50%,大壓(ya)(ya)下量的(de)軋(ya)(ya)(ya)制(zhi)(zhi)將產生(sheng)大的(de)變形(xing)熱(re)補充帶(dai)材(cai)在軋(ya)(ya)(ya)制(zhi)(zhi)過(guo)程中的(de)熱(re)損失，有利于(yu)維持(chi)正常軋(ya)(ya)(ya)制(zhi)(zhi)。3）最(zui)后軋(ya)(ya)(ya)制(zhi)(zhi)階段(duan)，- 般道(dao)(dao)次(ci)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)減小(xiao)(xiao)。為(wei)防(fang)止熱(re)軋(ya)(ya)(ya)制(zhi)(zhi)品產生(sheng)粗大晶(jing)粒(li)，熱(re)軋(ya)(ya)(ya)最(zui)后道(dao)(dao)次(ci)的(de)加(jia)(jia)工(gong)(gong)(gong)率(lv)(lv)應(ying)大于(yu)臨界變形(xing)量（15% ~ 20%）；熱(re)軋(ya)(ya)(ya)最(zui)后兩道(dao)(dao)次(ci)溫度較(jiao)(jiao)低(di)，變形(xing)抗力較(jiao)(jiao)大，其(qi)(qi)壓(ya)(ya)下量分配應(ying)保持(chi)板材(cai)良(liang)好的(de)板形(xing)，厚度偏差及表面(mian)質量。