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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)(zao)(zao)型(xing)造(zao)(zao)(zao)芯(xin)(xin)都實(shi)現(xian)了(le)機(ji)械化或自動(dong)化。常用的砂(sha)型(xing)造(zao)(zao)(zao)型(xing)造(zao)(zao)(zao)芯(xin)(xin)設備有高、中(zhong)、低壓(ya)造(zao)(zao)(zao)型(xing)機(ji)、拋(pao)砂(sha)機(ji)、無箱射壓(ya)造(zao)(zao)(zao)型(xing)機(ji)、射芯(xin)(xin)機(ji)、冷和熱(re)芯(xin)(xin)盒機(ji)等。
叉車配重鐵(tie)(tie)(tie)工藝可分(fen)為(wei)(wei)(wei)三(san)個(ge)基本部(bu)分(fen),即配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)金(jin)屬(shu)(shu)準(zhun)備(bei)、鑄型(xing)準(zhun)備(bei)和鑄件處理。 配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)金(jin)屬(shu)(shu)是(shi)指配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)生(sheng)產中用于澆(jiao)注鑄件的(de)金(jin)屬(shu)(shu)材(cai)料,它是(shi)以(yi)一種金(jin)屬(shu)(shu)元素(su)為(wei)(wei)(wei)主(zhu)要(yao)成分(fen),并加入其他金(jin)屬(shu)(shu)或非金(jin)屬(shu)(shu)元素(su)而組(zu)成的(de)合(he)(he)金(jin),習慣上稱為(wei)(wei)(wei)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)合(he)(he)金(jin),主(zhu)要(yao)有鑄鐵(tie)(tie)(tie)、鑄鋼和配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)有色(se)合(he)(he)金(jin)。叉車(che)(che)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)按造型(xing)材(cai)料的(de)不同,又可分(fen)為(wei)(wei)(wei)兩大(da)類(lei):一類(lei)以(yi)天(tian)然礦產砂(sha)石作為(wei)(wei)(wei)主(zhu)要(yao)造型(xing)材(cai)料,如熔(rong)模配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、殼(ke)型(xing)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、負壓配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、泥型(xing)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、實型(xing)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、陶瓷型(xing)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)等;一類(lei)以(yi)金(jin)屬(shu)(shu)作為(wei)(wei)(wei)主(zhu)要(yao)鑄型(xing)材(cai)料,如金(jin)屬(shu)(shu)型(xing)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、離心(xin)配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、連續配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)、叉車(che)(che)配(pei)件鐵(tie)(tie)(tie)、低壓配(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)(tie)等。
配重塊結(jie)構設(she)計除應(ying)符合(he)機器設(she)備本身的(de)要求和機械加工(gong)(gong)工(gong)(gong)藝性(xing)的(de)要求外(wai),還應(ying)符合(he)鑄造工(gong)(gong)藝的(de)要求,配重塊的(de)結(jie)構設(she)計應(ying)注意以下幾點:
一、要便于制造模型、芯(xin)盒和造型:
1)配(pei)重塊的外形應力求簡(jian)單,以(yi)便于起模,應盡量使鑄造分型面為平面,且數目小;
2)配重塊的內(nei)腔應力求鑄造(zao)時(shi)(shi)不用或少(shao)用型芯,當采用型芯時(shi)(shi),應方便其支撐(cheng)、固定及排氣出砂(sha),時(shi)(shi)應設有足夠(gou)的工藝(yi)孔;
3)對于配重塊(kuai)內外側面及(ji)加強肋等結(jie)構(gou),應在起模方向(xiang)設有的結(jie)構(gou)斜(xie)度(du);
4)配(pei)重塊上的凸(tu)臺部分與配(pei)重鐵本體不應相差過大,好取同一高度,同一面(mian)上的距離較近的幾(ji)個凸(tu)臺,好連成(cheng)整體的凸(tu)起(qi)部分。
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