約鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)工(gong)(gong)藝(yi)具(ju)有材(cai)料利用率(lv)高,勞動條件(jian)好,易于(yu)實(shi)現(xian)(xian)(xian)機械(xie)化與(yu)(yu)自動化,生產效率(lv)高,投資(zi)少成本低的(de)(de)(de)特(te)點。在(zai)連(lian)桿(gan)(gan)(gan)(gan)模(mo)(mo)(mo)(mo)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)生產中,輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)工(gong)(gong)序(xu)主要用于(yu)制(zhi)坯(pi)(pi)(pi),進行金屬體(ti)積的(de)(de)(de)合理分配(pei)(pei),并使之與(yu)(yu)連(lian)桿(gan)(gan)(gan)(gan)模(mo)(mo)(mo)(mo)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)的(de)(de)(de)預鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)、終鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)模(mo)(mo)(mo)(mo)膛(tang)合理匹(pi)配(pei)(pei)輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)制(zhi)坯(pi)(pi)(pi)工(gong)(gong)藝(yi)在(zai)連(lian)桿(gan)(gan)(gan)(gan)模(mo)(mo)(mo)(mo)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)生產中具(ju)有重要作用,是(shi)(shi)(shi)(shi)(shi)(shi)保(bao)證連(lian)桿(gan)(gan)(gan)(gan)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)件(jian)質(zhi)量(liang)的(de)(de)(de)第一(yi)關,在(zai)輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)制(zhi)坯(pi)(pi)(pi)工(gong)(gong)藝(yi)設(she)計中,除要盡可能(neng)提高材(cai)料利用率(lv)外,更(geng)要重視輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)工(gong)(gong)藝(yi)及模(mo)(mo)(mo)(mo)具(ju)的(de)(de)(de)設(she)計與(yu)(yu)計算。主要是(shi)(shi)(shi)(shi)(shi)(shi)保(bao)證連(lian)桿(gan)(gan)(gan)(gan)毛(mao)坯(pi)(pi)(pi)在(zai)每(mei)一(yi)道次(ci)的(de)(de)(de)輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)過(guo)(guo)程中不(bu)能(neng)出(chu)(chu)(chu)現(xian)(xian)(xian)折疊(die)(die),尤其(qi)是(shi)(shi)(shi)(shi)(shi)(shi)連(lian)桿(gan)(gan)(gan)(gan)的(de)(de)(de)桿(gan)(gan)(gan)(gan)部(bu)區段(duan)。連(lian)桿(gan)(gan)(gan)(gan)輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)制(zhi)坯(pi)(pi)(pi)工(gong)(gong)序(xu)常(chang)見的(de)(de)(de)問(wen)題(ti)是(shi)(shi)(shi)(shi)(shi)(shi):一(yi)是(shi)(shi)(shi)(shi)(shi)(shi)桿(gan)(gan)(gan)(gan)部(bu)出(chu)(chu)(chu)現(xian)(xian)(xian)折疊(die)(die);二是(shi)(shi)(shi)(shi)(shi)(shi)桿(gan)(gan)(gan)(gan)部(bu)與(yu)(yu)小頭過(guo)(guo)渡段(duan)出(chu)(chu)(chu)現(xian)(xian)(xian)梅花瓣形(xing)狀;三是(shi)(shi)(shi)(shi)(shi)(shi)各道次(ci)輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)咬人點不(bu)齊,影響輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)毛(mao)坯(pi)(pi)(pi)整(zheng)體(ti)長度(du)尺寸造成與(yu)(yu)模(mo)(mo)(mo)(mo)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)模(mo)(mo)(mo)(mo)膛(tang)不(bu)匹(pi)配(pei)(pei)。由于(yu)輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)工(gong)(gong)序(xu)出(chu)(chu)(chu)現(xian)(xian)(xian)的(de)(de)(de)上述幾個問(wen)題(ti),勢必導致連(lian)桿(gan)(gan)(gan)(gan)模(mo)(mo)(mo)(mo)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)后在(zai)部(bu)出(chu)(chu)(chu)現(xian)(xian)(xian)折疊(die)(die)或(huo)在(zai)桿(gan)(gan)(gan)(gan)部(bu)與(yu)(yu)小頭過(guo)(guo)渡段(duan)出(chu)(chu)(chu)現(xian)(xian)(xian)折疊(die)(die)。如輥(gun)(gun)(gun)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)毛(mao)坯(pi)(pi)(pi)長度(du)方向上的(de)(de)(de)各特(te)征段(duan)與(yu)(yu)模(mo)(mo)(mo)(mo)鍛(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)模(mo)(mo)(mo)(mo)膛(tang)不(bu)匹(pi)配(pei)(pei),則(ze)可能(neng)在(zai)其(qi)他地(di)方出(chu)(chu)(chu)現(xian)(xian)(xian)折疊(die)(die)或(huo)充不(bu)滿的(de)(de)(de)缺(que)陷。
對于輥鍛(duan)工序上(shang)述常見問題要采(cai)取(qu)的相(xiang)應(ying)技術對策主要是(shi):
(1)在輥鍛模(mo)具工藝(yi)及模(mo)具設計(ji)中要(yao)合理確定各道次(ci)輥鍛毛坯的(de)形狀與尺寸;
(2)選擇好(hao)型槽系,并要合理分配各(ge)道次延伸系數;
(3)合(he)理確(que)定各道次(ci)輥鍛毛坯不同區(qu)段的前滑(hua)值的大小;
(4)準確計算各道毛壞截面尺(chi)寸與型槽尺(chi)寸;一(yi)5,
(5)提高模具制造精度(du),保證型槽的(de)設計尺
(6)采用自動輥鍛機(ji)械(xie)手或半自動送出料裝置,提(ti)高縱、橫(heng)向定位精度;
(7)在輥鍛模具修整(zheng)中(zhong),要注重各道次的(de)協(xie)調一致,盡量保(bao)證型(xing)槽與原(yuan)始(shi)設計(ji),加工(gong)的(de)型(xing)槽或經(jing)調試確定(ding)后的(de)型(xing)槽一致,并要經(jing)常檢查(cha)輥鍛件的(de)質量。