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鑄件的精度和生產過程的經濟表現,主要取決于這道工序。在很多現代化的配重鐵車間里(li),造(zao)(zao)(zao)(zao)型(xing)造(zao)(zao)(zao)(zao)芯都(dou)實現(xian)了(le)機(ji)(ji)械化(hua)或自動化(hua)。常用的砂型(xing)造(zao)(zao)(zao)(zao)型(xing)造(zao)(zao)(zao)(zao)芯設備有高、中、低壓造(zao)(zao)(zao)(zao)型(xing)機(ji)(ji)、拋砂機(ji)(ji)、無箱(xiang)射(she)(she)壓造(zao)(zao)(zao)(zao)型(xing)機(ji)(ji)、射(she)(she)芯機(ji)(ji)、冷(leng)和熱(re)芯盒(he)機(ji)(ji)等(deng)。
叉車配重鐵工(gong)藝可分(fen)為(wei)三(san)個(ge)基本部(bu)分(fen),即配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵金(jin)屬準備(bei)、鑄(zhu)(zhu)(zhu)型(xing)準備(bei)和鑄(zhu)(zhu)(zhu)件處理(li)。 配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵金(jin)屬是指配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵生產(chan)中用于澆注鑄(zhu)(zhu)(zhu)件的金(jin)屬材料,它是以(yi)一種金(jin)屬元(yuan)素為(wei)主(zhu)(zhu)要成(cheng)分(fen),并加入(ru)其他金(jin)屬或(huo)非(fei)金(jin)屬元(yuan)素而組成(cheng)的合金(jin),習慣上稱為(wei)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵合金(jin),主(zhu)(zhu)要有(you)鑄(zhu)(zhu)(zhu)鐵、鑄(zhu)(zhu)(zhu)鋼和配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵有(you)色合金(jin)。叉車(che)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵按造(zao)型(xing)材料的不同,又(you)可分(fen)為(wei)兩大(da)類(lei):一類(lei)以(yi)天然礦產(chan)砂石(shi)作為(wei)主(zhu)(zhu)要造(zao)型(xing)材料,如熔模(mo)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、殼(ke)型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、負壓(ya)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、泥型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、實(shi)型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、陶(tao)瓷型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵等;一類(lei)以(yi)金(jin)屬作為(wei)主(zhu)(zhu)要鑄(zhu)(zhu)(zhu)型(xing)材料,如金(jin)屬型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、離心配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、連續配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵、叉車(che)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)件鐵、低(di)壓(ya)配(pei)(pei)(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵等。
配重塊結構(gou)設(she)計除應符合(he)機(ji)器設(she)備本身的要(yao)求和機(ji)械加工(gong)(gong)工(gong)(gong)藝性的要(yao)求外,還應符合(he)鑄造工(gong)(gong)藝的要(yao)求,配重塊(kuai)的結構(gou)設(she)計應注意以下幾點:
一、要便于(yu)制造模型(xing)、芯盒和造型(xing):
1)配重塊的(de)外形應(ying)力(li)求(qiu)簡單,以便(bian)于起(qi)模,應(ying)盡(jin)量使鑄造分型(xing)面(mian)為平(ping)面(mian),且數(shu)目(mu)小(xiao);
2)配重塊的內腔應(ying)力求鑄造(zao)時不用(yong)或少用(yong)型芯,當采用(yong)型芯時,應(ying)方便其(qi)支撐、固(gu)定及排氣出(chu)砂,時應(ying)設(she)有(you)足夠的工藝孔;
3)對于配重塊(kuai)內外側(ce)面及加強(qiang)肋等結(jie)構(gou),應在起模方(fang)向設有(you)的結(jie)構(gou)斜度(du);
4)配重(zhong)塊上(shang)的(de)(de)凸(tu)臺(tai)部分(fen)與配重(zhong)鐵(tie)本體不應相(xiang)差過大(da),好取(qu)同(tong)一高度(du),同(tong)一面上(shang)的(de)(de)距離較近的(de)(de)幾個凸(tu)臺(tai),好連成整體的(de)(de)凸(tu)起部分(fen)。
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