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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)(xing)造芯都實現了機(ji)(ji)械化或(huo)自動化。常用(yong)的砂型(xing)(xing)造型(xing)(xing)造芯設備有高、中、低壓造型(xing)(xing)機(ji)(ji)、拋(pao)砂機(ji)(ji)、無箱射(she)壓造型(xing)(xing)機(ji)(ji)、射(she)芯機(ji)(ji)、冷和熱芯盒機(ji)(ji)等。
叉車配重鐵(tie)(tie)工藝可分(fen)(fen)為(wei)三(san)個基(ji)本部分(fen)(fen),即配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)金(jin)(jin)屬(shu)準備(bei)、鑄(zhu)型(xing)(xing)(xing)(xing)準備(bei)和鑄(zhu)件(jian)處(chu)理。 配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)金(jin)(jin)屬(shu)是指配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)生產中(zhong)用于澆注鑄(zhu)件(jian)的金(jin)(jin)屬(shu)材(cai)料,它是以(yi)一(yi)種金(jin)(jin)屬(shu)元(yuan)(yuan)素為(wei)主(zhu)(zhu)要(yao)(yao)成(cheng)分(fen)(fen),并加(jia)入其他(ta)金(jin)(jin)屬(shu)或(huo)非金(jin)(jin)屬(shu)元(yuan)(yuan)素而(er)組成(cheng)的合金(jin)(jin),習慣(guan)上(shang)稱為(wei)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)合金(jin)(jin),主(zhu)(zhu)要(yao)(yao)有鑄(zhu)鐵(tie)(tie)、鑄(zhu)鋼和配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)有色合金(jin)(jin)。叉(cha)車配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)按造型(xing)(xing)(xing)(xing)材(cai)料的不同,又(you)可分(fen)(fen)為(wei)兩(liang)大類:一(yi)類以(yi)天然礦(kuang)產砂石(shi)作為(wei)主(zhu)(zhu)要(yao)(yao)造型(xing)(xing)(xing)(xing)材(cai)料,如(ru)熔模配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、殼型(xing)(xing)(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、負(fu)壓配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、泥(ni)型(xing)(xing)(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、實型(xing)(xing)(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、陶(tao)瓷型(xing)(xing)(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)等(deng);一(yi)類以(yi)金(jin)(jin)屬(shu)作為(wei)主(zhu)(zhu)要(yao)(yao)鑄(zhu)型(xing)(xing)(xing)(xing)材(cai)料,如(ru)金(jin)(jin)屬(shu)型(xing)(xing)(xing)(xing)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、離心(xin)配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、連續配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)、叉(cha)車配(pei)(pei)(pei)(pei)件(jian)鐵(tie)(tie)、低壓配(pei)(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)(tie)等(deng)。
配重塊結構設(she)計(ji)除應符合機(ji)器設(she)備(bei)本(ben)身的(de)(de)要(yao)求(qiu)和機(ji)械加(jia)工(gong)工(gong)藝性(xing)的(de)(de)要(yao)求(qiu)外,還應符合鑄(zhu)造工(gong)藝的(de)(de)要(yao)求(qiu),配重(zhong)塊的(de)(de)結構設(she)計(ji)應注意以下(xia)幾(ji)點(dian):
一、要便于制造(zao)模(mo)型、芯盒和造(zao)型:
1)配重(zhong)塊的外形應力求簡單,以(yi)便(bian)于起模,應盡(jin)量使鑄造分型面為平(ping)面,且數(shu)目小(xiao);
2)配重塊的內腔應力求鑄造時不用(yong)或少用(yong)型芯(xin),當采用(yong)型芯(xin)時,應方便其(qi)支撐(cheng)、固定及排氣出砂(sha),時應設有足夠(gou)的工藝孔;
3)對于配重塊內外側面及加強(qiang)肋等結構,應在(zai)起(qi)模方(fang)向設有的結構斜度(du);
4)配重(zhong)塊(kuai)上的(de)凸(tu)(tu)臺部分與配重(zhong)鐵本(ben)體不應(ying)相(xiang)差過大,好取同一高度(du),同一面上的(de)距離較近的(de)幾個凸(tu)(tu)臺,好連成整體的(de)凸(tu)(tu)起部分。
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