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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(li),造(zao)型(xing)造(zao)芯都實(shi)現了機(ji)(ji)(ji)械化(hua)或(huo)自動(dong)化(hua)。常用的(de)砂(sha)型(xing)造(zao)型(xing)造(zao)芯設備有高、中、低壓造(zao)型(xing)機(ji)(ji)(ji)、拋砂(sha)機(ji)(ji)(ji)、無箱射(she)壓造(zao)型(xing)機(ji)(ji)(ji)、射(she)芯機(ji)(ji)(ji)、冷(leng)和(he)熱芯盒機(ji)(ji)(ji)等。
叉車配重鐵(tie)工藝可分為(wei)(wei)三(san)個基本(ben)部(bu)分,即配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)金(jin)(jin)屬準備(bei)、鑄型準備(bei)和鑄件處理(li)。 配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)金(jin)(jin)屬是指配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)生(sheng)產中(zhong)用于澆注鑄件的(de)金(jin)(jin)屬材料,它是以一種金(jin)(jin)屬元(yuan)素為(wei)(wei)主(zhu)要(yao)(yao)(yao)成分,并加入(ru)其(qi)他(ta)金(jin)(jin)屬或(huo)非金(jin)(jin)屬元(yuan)素而組成的(de)合(he)金(jin)(jin),習(xi)慣上稱(cheng)為(wei)(wei)配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)合(he)金(jin)(jin),主(zhu)要(yao)(yao)(yao)有(you)鑄鐵(tie)、鑄鋼和配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)有(you)色合(he)金(jin)(jin)。叉車(che)配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)按造(zao)型材料的(de)不同,又可分為(wei)(wei)兩大(da)類:一類以天然(ran)礦產砂石作為(wei)(wei)主(zhu)要(yao)(yao)(yao)造(zao)型材料,如(ru)熔模配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、殼型配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、負壓配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、泥型配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、實型配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、陶瓷型配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)等(deng);一類以金(jin)(jin)屬作為(wei)(wei)主(zhu)要(yao)(yao)(yao)鑄型材料,如(ru)金(jin)(jin)屬型配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、離(li)心配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、連續配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)、叉車(che)配(pei)(pei)(pei)件鐵(tie)、低壓配(pei)(pei)(pei)重(zhong)(zhong)(zhong)鐵(tie)等(deng)。
配重塊結構設(she)(she)計除應符合(he)機器設(she)(she)備(bei)本(ben)身的(de)要(yao)(yao)求(qiu)(qiu)(qiu)和(he)機械加工(gong)工(gong)藝性的(de)要(yao)(yao)求(qiu)(qiu)(qiu)外,還應符合(he)鑄造(zao)工(gong)藝的(de)要(yao)(yao)求(qiu)(qiu)(qiu),配重塊的(de)結構設(she)(she)計應注意以(yi)下幾(ji)點:
一、要便于制造模(mo)型、芯(xin)盒和造型:
1)配重塊的外形應力求簡單,以便(bian)于起模(mo),應盡量使鑄造分型面為平面,且數目小;
2)配重塊的內腔(qiang)應(ying)(ying)力求鑄造時(shi)不用(yong)或少用(yong)型(xing)芯(xin),當采(cai)用(yong)型(xing)芯(xin)時(shi),應(ying)(ying)方便其支(zhi)撐(cheng)、固定(ding)及排氣出砂(sha),時(shi)應(ying)(ying)設有足夠的工(gong)藝(yi)孔;
3)對于(yu)配重塊內外側面及加強肋等結構(gou),應在起模方向設有的結構(gou)斜度;
4)配(pei)重(zhong)塊上(shang)的凸(tu)臺部分與配(pei)重(zhong)鐵(tie)本體(ti)不應相差過大,好(hao)(hao)取同(tong)一高度,同(tong)一面上(shang)的距離較近(jin)的幾個凸(tu)臺,好(hao)(hao)連成整(zheng)體(ti)的凸(tu)起部分。
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