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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,造型(xing)造芯(xin)都實現了機械化或自動化。常用的(de)砂(sha)型(xing)造型(xing)造芯(xin)設備有高(gao)、中、低壓(ya)造型(xing)機、拋砂(sha)機、無箱射壓(ya)造型(xing)機、射芯(xin)機、冷(leng)和熱芯(xin)盒機等(deng)。
叉車配重鐵工(gong)藝可分(fen)為(wei)(wei)(wei)三個基本(ben)部分(fen),即配重(zhong)(zhong)鐵金(jin)屬(shu)準(zhun)備、鑄(zhu)(zhu)型(xing)準(zhun)備和鑄(zhu)(zhu)件處理(li)。 配重(zhong)(zhong)鐵金(jin)屬(shu)是(shi)指配重(zhong)(zhong)鐵生產中用(yong)于(yu)澆注(zhu)鑄(zhu)(zhu)件的(de)(de)金(jin)屬(shu)材(cai)料(liao),它(ta)是(shi)以(yi)一種(zhong)金(jin)屬(shu)元素為(wei)(wei)(wei)主(zhu)要(yao)(yao)成分(fen),并加入其(qi)他金(jin)屬(shu)或非金(jin)屬(shu)元素而組成的(de)(de)合(he)金(jin),習慣(guan)上稱為(wei)(wei)(wei)配重(zhong)(zhong)鐵合(he)金(jin),主(zhu)要(yao)(yao)有(you)鑄(zhu)(zhu)鐵、鑄(zhu)(zhu)鋼和配重(zhong)(zhong)鐵有(you)色合(he)金(jin)。叉(cha)車配重(zhong)(zhong)鐵按造(zao)型(xing)材(cai)料(liao)的(de)(de)不同,又可分(fen)為(wei)(wei)(wei)兩大(da)類(lei):一類(lei)以(yi)天然礦產砂石作為(wei)(wei)(wei)主(zhu)要(yao)(yao)造(zao)型(xing)材(cai)料(liao),如熔模配重(zhong)(zhong)鐵、殼型(xing)配重(zhong)(zhong)鐵、負壓(ya)配重(zhong)(zhong)鐵、泥型(xing)配重(zhong)(zhong)鐵、實型(xing)配重(zhong)(zhong)鐵、陶瓷(ci)型(xing)配重(zhong)(zhong)鐵等;一類(lei)以(yi)金(jin)屬(shu)作為(wei)(wei)(wei)主(zhu)要(yao)(yao)鑄(zhu)(zhu)型(xing)材(cai)料(liao),如金(jin)屬(shu)型(xing)配重(zhong)(zhong)鐵、離心配重(zhong)(zhong)鐵、連續配重(zhong)(zhong)鐵、叉(cha)車配件鐵、低壓(ya)配重(zhong)(zhong)鐵等。
配重塊結構(gou)設(she)計除應符合(he)機器設(she)備(bei)本身的要(yao)求和機械(xie)加工工藝性的要(yao)求外,還應符合(he)鑄造工藝的要(yao)求,配重(zhong)塊的結構(gou)設(she)計應注意以下(xia)幾點(dian):
一、要便于制造(zao)模型(xing)、芯盒和造(zao)型(xing):
1)配重(zhong)塊的(de)外形應力求簡單(dan),以便于起(qi)模(mo),應盡量使鑄(zhu)造分(fen)型(xing)面為平面,且數目小;
2)配重(zhong)塊的內(nei)腔應力求(qiu)鑄造時不用(yong)(yong)或少(shao)用(yong)(yong)型(xing)(xing)芯,當采用(yong)(yong)型(xing)(xing)芯時,應方(fang)便其支撐、固定及排(pai)氣出(chu)砂(sha),時應設(she)有(you)足夠的工(gong)藝孔;
3)對于(yu)配重塊內(nei)外側面(mian)及加強肋等結構,應在起模方向設有的結構斜度;
4)配(pei)重(zhong)塊上的凸(tu)臺(tai)部分與配(pei)重(zhong)鐵本體(ti)不應(ying)相差(cha)過大,好取同(tong)一高度,同(tong)一面(mian)上的距(ju)離較近的幾個凸(tu)臺(tai),好連成整體(ti)的凸(tu)起(qi)部分。
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