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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(zao)型(xing)(xing)造(zao)芯(xin)都實(shi)現了機械(xie)化(hua)或自動化(hua)。常用的砂型(xing)(xing)造(zao)型(xing)(xing)造(zao)芯(xin)設(she)備有高、中、低壓造(zao)型(xing)(xing)機、拋砂機、無(wu)箱射壓造(zao)型(xing)(xing)機、射芯(xin)機、冷和熱芯(xin)盒(he)機等。
叉車配重鐵(tie)(tie)工(gong)藝可分為三個基本部(bu)分,即配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)金(jin)(jin)屬(shu)(shu)準備、鑄型(xing)(xing)準備和鑄件處理。 配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)金(jin)(jin)屬(shu)(shu)是指配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)生產中用(yong)于澆注鑄件的金(jin)(jin)屬(shu)(shu)材料,它(ta)是以一(yi)(yi)種(zhong)金(jin)(jin)屬(shu)(shu)元(yuan)素(su)為主要成(cheng)分,并加(jia)入(ru)其(qi)他金(jin)(jin)屬(shu)(shu)或非金(jin)(jin)屬(shu)(shu)元(yuan)素(su)而組成(cheng)的合(he)(he)金(jin)(jin),習慣上稱為配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)合(he)(he)金(jin)(jin),主要有鑄鐵(tie)(tie)、鑄鋼和配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)有色(se)合(he)(he)金(jin)(jin)。叉車配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)按造型(xing)(xing)材料的不同,又可分為兩(liang)大類(lei):一(yi)(yi)類(lei)以天(tian)然礦產砂石作為主要造型(xing)(xing)材料,如熔模(mo)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、殼(ke)型(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、負壓配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、泥(ni)型(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、實型(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、陶瓷型(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)等;一(yi)(yi)類(lei)以金(jin)(jin)屬(shu)(shu)作為主要鑄型(xing)(xing)材料,如金(jin)(jin)屬(shu)(shu)型(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、離心配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、連續(xu)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、叉車配(pei)(pei)(pei)(pei)件鐵(tie)(tie)、低壓配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)等。
配重塊結(jie)構設計(ji)除應(ying)符合(he)(he)機(ji)器設備(bei)本身的要求和機(ji)械加工(gong)(gong)工(gong)(gong)藝性(xing)的要求外,還(huan)應(ying)符合(he)(he)鑄(zhu)造工(gong)(gong)藝的要求,配重塊的結(jie)構設計(ji)應(ying)注意以下幾(ji)點(dian):
一、要便于制造模(mo)型(xing)、芯盒和造型(xing):
1)配重塊(kuai)的外形應力求簡單,以(yi)便于起模,應盡量使鑄(zhu)造分型面(mian)為(wei)平(ping)面(mian),且數目小;
2)配重塊的內腔(qiang)應力求鑄造(zao)時(shi)不用或(huo)少用型芯,當采用型芯時(shi),應方(fang)便其支撐、固定及(ji)排(pai)氣出(chu)砂,時(shi)應設有(you)足夠的工藝孔;
3)對于配重塊內外側面及加(jia)強肋等結構,應在起模方向(xiang)設有的(de)結構斜度;
4)配(pei)重塊上的(de)凸(tu)臺(tai)部分(fen)與配(pei)重鐵本體不應(ying)相(xiang)差過大,好取同(tong)一(yi)高度(du),同(tong)一(yi)面上的(de)距離(li)較(jiao)近的(de)幾個凸(tu)臺(tai),好連(lian)成整體的(de)凸(tu)起部分(fen)。
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