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石墨模具的應用

發布時間:2019-11-09 14:56:59 瀏覽:814次

   目前,石墨模具主要在以下幾個方面得到了廣泛的應用:


    有色金屬(shu)連續鑄(zhu)造及半連續鑄(zhu)造用石墨(mo)模具


    近(jin)年來,國內外正在(zai)推(tui)廣由熔融金(jin)(jin)屬(shu)狀(zhuang)態(tai)直(zhi)接(jie)連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)(或(huo)半連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)的(de)(de))制造(zao)(zao)(zao)棒材(cai)(cai)或(huo)管(guan)材(cai)(cai)等*的(de)(de)生產(chan)方(fang)法(fa)。國內在(zai)銅(tong),銅(tong)合金(jin)(jin),鋁,鋁合金(jin)(jin)等方(fang)面(mian)已開始(shi)采(cai)(cai)用這種方(fang)法(fa)。人造(zao)(zao)(zao)石墨作為有色(se)金(jin)(jin)屬(shu)的(de)(de)連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)鑄(zhu)(zhu)造(zao)(zao)(zao)或(huo)半連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)鑄(zhu)(zhu)造(zao)(zao)(zao)用模(mo)具被認為是*合適的(de)(de)材(cai)(cai)料。生產(chan)實踐證明(ming),由于(yu)采(cai)(cai)用了(le)(le)石墨模(mo)具,因其導熱性能(neng)良好(導熱性能(neng)決定了(le)(le)金(jin)(jin)屬(shu)或(huo)合金(jin)(jin)的(de)(de)凝固速(su)度),模(mo)具的(de)(de)自潤滑性能(neng)好等因素,不但使鑄(zhu)(zhu)型速(su)度提(ti)高,而(er)且由于(yu)鑄(zhu)(zhu)錠(ding)的(de)(de)尺寸(cun)*,表面(mian)光滑,結(jie)晶組織均勻,可直(zhi)接(jie)進行下道(dao)工(gong)(gong)序的(de)(de)加工(gong)(gong)。這不僅大(da)(da)大(da)(da)提(ti)高了(le)(le)成(cheng)品(pin)率,減少了(le)(le)廢品(pin)損失,而(er)且產(chan)品(pin)質量也有大(da)(da)幅度的(de)(de)提(ti)高。連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)鑄(zhu)(zhu)造(zao)(zao)(zao)方(fang)法(fa)有立式連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)鑄(zhu)(zhu)造(zao)(zao)(zao)法(fa)和臥式連(lian)(lian)(lian)(lian)(lian)續(xu)(xu)鑄(zhu)(zhu)造(zao)(zao)(zao)法(fa)兩(liang)種。


    加壓鑄(zhu)造(zao)用模具


    人(ren)造石(shi)墨材料已成功地用(yong)于(yu)有色金屬(shu)的(de)加壓(ya)鑄(zhu)造上。例如,用(yong)人(ren)造石(shi)墨材料制造的(de)加壓(ya)鑄(zhu)造用(yong)模具(ju)生產的(de)鋅合金和(he)銅(tong)合金的(de)鑄(zhu)件已用(yong)于(yu)汽車(che)*件等(deng)方(fang)面。


    離心鑄造用石(shi)墨模具


    石墨(mo)(mo)模(mo)已成功應用于離(li)心鑄(zhu)(zhu)造(zao)上(shang)。美國已采(cai)(cai)用壁(bi)厚為(wei)25毫米以(yi)(yi)上(shang)的人造(zao)石墨(mo)(mo)鑄(zhu)(zhu)模(mo)來離(li)心鑄(zhu)(zhu)造(zao)青銅套管(guan)。為(wei)了防止人造(zao)石墨(mo)(mo)模(mo)的燒(shao)損(sun),可(ke)采(cai)(cai)取一(yi)定的防氧化(hua)措施。澆鑄(zhu)(zhu)一(yi)定數量(liang)的鑄(zhu)(zhu)件后,如果發現(xian)鑄(zhu)(zhu)模(mo)內表面(mian)燒(shao)損(sun),可(ke)以(yi)(yi)將鑄(zhu)(zhu)模(mo)內孔的尺寸擴大以(yi)(yi)便用來鑄(zhu)(zhu)造(zao)大規(gui)格套管(guan)。


    熱壓壓模(mo)模(mo)具


    人(ren)造石墨熱壓(ya)壓(ya)模用于硬質合金的(de)加(jia)壓(ya)燒結(jie)方(fang)面具有下(xia)述特點: 一是若壓(ya)制溫度提高到1350-1450度時,則(ze)所需單位壓(ya)力可降到67-100公斤力/平方(fang)厘米(即為冷壓(ya)壓(ya)力的(de)1/10)就(jiu)可;二(er)是加(jia)壓(ya)和加(jia)熱在(zai)同一道工(gong)序進行,經短(duan)時間的(de)燒結(jie)就(jiu)能得到致(zhi)密的(de)燒結(jie)體。

石墨模具|石墨棒|石墨坩堝

    玻璃成型用模具


    由于石墨(mo)材(cai)料具有化學穩(wen)定性,不(bu)(bu)易受熔融玻璃(li)(li)的(de)浸潤,不(bu)(bu)會(hui)改變(bian)玻璃(li)(li)的(de)成分,石墨(mo)材(cai)料耐熱沖擊性能良(liang)好,尺寸隨溫度(du)變(bian)化小等特點,所以近年來(lai)在(zai)玻璃(li)(li)制造中(zhong)成為(wei)不(bu)(bu)可缺少(shao)的(de)模具材(cai)料,可以用它來(lai)制造玻璃(li)(li)管,彎管,漏斗及其它各種異型玻璃(li)(li)瓶的(de)鑄(zhu)模。


    燒(shao)(shao)結(jie)模(mo)(mo)及其它金(jin)剛石(shi)燒(shao)(shao)結(jie)模(mo)(mo)具(ju)


    利用(yong)(yong)人造(zao)石(shi)(shi)(shi)墨材(cai)料(liao)熱(re)變形極(ji)小(xiao)的(de)(de)特點,可(ke)制造(zao)晶體管的(de)(de)燒結(jie)模(mo)具(ju)(ju)(ju)(ju)和支(zhi)(zhi)架,現已廣泛使用(yong)(yong),它已成(cheng)(cheng)為(wei)發展(zhan)半導(dao)體工(gong)(gong)(gong)業不可(ke)缺少的(de)(de)材(cai)料(liao)。此外(wai),石(shi)(shi)(shi)墨模(mo)具(ju)(ju)(ju)(ju)也使用(yong)(yong)于鑄(zhu)(zhu)鐵用(yong)(yong)的(de)(de)鑄(zhu)(zhu)型(xing)(xing),各(ge)種(zhong)有(you)(you)色金屬(shu)用(yong)(yong)的(de)(de)耐(nai)久性(xing)鑄(zhu)(zhu)模(mo),鑄(zhu)(zhu)鋼用(yong)(yong)鑄(zhu)(zhu)型(xing)(xing),耐(nai)熱(re)金屬(shu)(鈦,鋯,鉬等(deng)(deng))用(yong)(yong)的(de)(de)鑄(zhu)(zhu)型(xing)(xing)及焊(han)鋼軌用(yong)(yong)的(de)(de)鋁熱(re)焊(han)型(xing)(xing)的(de)(de)鑄(zhu)(zhu)型(xing)(xing)等(deng)(deng)。熱(re)壓燒結(jie)金剛(gang)石(shi)(shi)(shi)工(gong)(gong)(gong)具(ju)(ju)(ju)(ju)用(yong)(yong)石(shi)(shi)(shi)墨模(mo)具(ju)(ju)(ju)(ju),在金剛(gang)石(shi)(shi)(shi)工(gong)(gong)(gong)具(ju)(ju)(ju)(ju)制造(zao)過程中擔負著發熱(re)元件(jian)和模(mo)具(ju)(ju)(ju)(ju)支(zhi)(zhi)撐的(de)(de)雙重(zhong)作用(yong)(yong),石(shi)(shi)(shi)墨模(mo)具(ju)(ju)(ju)(ju)質(zhi)量的(de)(de)優劣,直接(jie)影響到金剛(gang)石(shi)(shi)(shi)工(gong)(gong)(gong)具(ju)(ju)(ju)(ju)的(de)(de)尺寸(cun)精度(du)、外(wai)觀形狀等(deng)(deng)。熱(re)壓燒結(jie)工(gong)(gong)(gong)藝要(yao)求(qiu):溫(wen)度(du)達到(1000±2)℃,成(cheng)(cheng)型(xing)(xing)壓力16~50MPa,保溫(wen)保壓時間為(wei)15~30min,環境為(wei)非真空狀態。在此工(gong)(gong)(gong)況條(tiao)件(jian)下,既要(yao)求(qiu)成(cheng)(cheng)型(xing)(xing)及發熱(re)元件(jian)的(de)(de)石(shi)(shi)(shi)墨模(mo)具(ju)(ju)(ju)(ju)具(ju)(ju)(ju)(ju)有(you)(you)導(dao)電性(xing)、較(jiao)(jiao)高(gao)的(de)(de)電阻率、足(zu)夠的(de)(de)機械強度(du),還需要(yao)其具(ju)(ju)(ju)(ju)有(you)(you)良好的(de)(de)抗(kang)氧化(hua)(hua)(hua)性(xing)能(neng)和較(jiao)(jiao)長的(de)(de)使用(yong)(yong)壽命,以確(que)保金剛(gang)石(shi)(shi)(shi)工(gong)(gong)(gong)具(ju)(ju)(ju)(ju)的(de)(de)尺寸(cun)精度(du)和優異性(xing)能(neng)。目前,西方發達*金剛(gang)石(shi)(shi)(shi)工(gong)(gong)(gong)具(ju)(ju)(ju)(ju)制造(zao)用(yong)(yong)石(shi)(shi)(shi)墨模(mo)具(ju)(ju)(ju)(ju)材(cai)料(liao),主要(yao)為(wei)超細顆(ke)粒(li)(li)結(jie)構(gou)、高(gao)純度(du)和高(gao)石(shi)(shi)(shi)墨化(hua)(hua)(hua)度(du)的(de)(de)石(shi)(shi)(shi)墨材(cai)料(liao),要(yao)求(qiu)其平均粒(li)(li)徑(jing)小(xiao)于15μm,甚(shen)至10μm以下,中等(deng)(deng)氣(qi)孔尺寸(cun)小(xiao)于2μm。用(yong)(yong)此炭素原料(liao)做成(cheng)(cheng)的(de)(de)石(shi)(shi)(shi)墨模(mo)具(ju)(ju)(ju)(ju),氣(qi)孔率小(xiao)、結(jie)構(gou)致密(mi)、表(biao)面光潔度(du)高(gao)、抗(kang)氧化(hua)(hua)(hua)性(xing)較(jiao)(jiao)強,平均使用(yong)(yong)壽命可(ke)達30~40次。金剛(gang)石(shi)(shi)(shi)模(mo)具(ju)(ju)(ju)(ju)要(yao)求(qiu)材(cai)質(zhi)硬(ying)度(du)高(gao),抗(kang)氧化(hua)(hua)(hua)性(xing)能(neng)好,加工(gong)(gong)(gong)精度(du)高(gao)等(deng)(deng)特點,采用(yong)(yong)*石(shi)(shi)(shi)墨原材(cai)料(liao)大大延長了(le)模(mo)具(ju)(ju)(ju)(ju)使用(yong)(yong)壽命和提高(gao)了(le)抗(kang)氧化(hua)(hua)(hua)性(xing)能(neng)。