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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(che)間里,造(zao)型造(zao)芯(xin)(xin)都實現了機(ji)械(xie)化(hua)或自動化(hua)。常用的砂型造(zao)型造(zao)芯(xin)(xin)設備(bei)有(you)高、中(zhong)、低壓(ya)造(zao)型機(ji)、拋砂機(ji)、無箱射壓(ya)造(zao)型機(ji)、射芯(xin)(xin)機(ji)、冷和熱(re)芯(xin)(xin)盒機(ji)等(deng)。
叉車配重鐵(tie)(tie)工藝(yi)可分(fen)為(wei)三個基本部(bu)分(fen),即配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)金(jin)(jin)(jin)屬準備、鑄(zhu)型(xing)準備和鑄(zhu)件(jian)處理。 配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)金(jin)(jin)(jin)屬是指配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)生產中用于澆注鑄(zhu)件(jian)的(de)金(jin)(jin)(jin)屬材(cai)(cai)料(liao),它(ta)是以(yi)一(yi)(yi)種金(jin)(jin)(jin)屬元(yuan)素(su)(su)為(wei)主(zhu)(zhu)要成(cheng)分(fen),并加(jia)入其他金(jin)(jin)(jin)屬或非金(jin)(jin)(jin)屬元(yuan)素(su)(su)而組成(cheng)的(de)合金(jin)(jin)(jin),習(xi)慣(guan)上稱為(wei)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)合金(jin)(jin)(jin),主(zhu)(zhu)要有鑄(zhu)鐵(tie)(tie)、鑄(zhu)鋼(gang)和配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)有色合金(jin)(jin)(jin)。叉車配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)按造型(xing)材(cai)(cai)料(liao)的(de)不同,又可分(fen)為(wei)兩大類(lei):一(yi)(yi)類(lei)以(yi)天然礦產砂石作為(wei)主(zhu)(zhu)要造型(xing)材(cai)(cai)料(liao),如熔模配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、殼型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、負壓配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、泥型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、實型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、陶瓷型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)等;一(yi)(yi)類(lei)以(yi)金(jin)(jin)(jin)屬作為(wei)主(zhu)(zhu)要鑄(zhu)型(xing)材(cai)(cai)料(liao),如金(jin)(jin)(jin)屬型(xing)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、離心(xin)配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、連續配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)、叉車配(pei)(pei)(pei)(pei)(pei)(pei)件(jian)鐵(tie)(tie)、低壓配(pei)(pei)(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)鐵(tie)(tie)等。
配重塊結構設計(ji)除應符合機(ji)器(qi)設備本身的(de)(de)要求(qiu)和機(ji)械(xie)加工(gong)工(gong)藝(yi)性的(de)(de)要求(qiu)外,還應符合鑄造工(gong)藝(yi)的(de)(de)要求(qiu),配重塊的(de)(de)結構設計(ji)應注意以下幾(ji)點:
一、要便于制(zhi)造(zao)(zao)模型(xing)、芯(xin)盒和造(zao)(zao)型(xing):
1)配重塊的(de)外形應(ying)力求簡單,以便于起模,應(ying)盡量使(shi)鑄造(zao)分型面為(wei)平(ping)面,且數目小;
2)配重塊的內腔應力求鑄造時(shi)不用(yong)(yong)或少用(yong)(yong)型芯(xin),當采用(yong)(yong)型芯(xin)時(shi),應方便其支撐、固定(ding)及排氣出砂,時(shi)應設有足夠的工藝孔(kong);
3)對(dui)于配重塊內外側面及加強肋等結(jie)(jie)構,應在(zai)起模方向設(she)有的(de)結(jie)(jie)構斜度(du);
4)配(pei)重(zhong)塊上的(de)凸(tu)臺部分與配(pei)重(zhong)鐵本(ben)體不應相(xiang)差過(guo)大,好取同(tong)(tong)一高度,同(tong)(tong)一面(mian)上的(de)距離較近的(de)幾(ji)個凸(tu)臺,好連成整(zheng)體的(de)凸(tu)起(qi)部分。
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