球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼、可鍛球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼、耐(nai)磨損(sun)球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼、耐(nai)蝕球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼及耐(nai)低(di)(di)溫球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼等的煅(duan)造(zao)機(ji)械(xie)效能般比灰球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼差(cha),如此,確定好同類(lei)球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼件在(zai)鑄型(xing)中的急(ji)冷事件,_有(you)力思考其煅(duan)造(zao)機(ji)械(xie)效能。這類(lei):硅、鋁硫含量較(jiao)高的耐(nai)低(di)(di)溫球(qiu)(qiu)(qiu)墨(mo)(mo)(mo)(mo)碳(tan)(tan)(tan)鋼,線(xian)縮小大,脆化變(bian)化熱度較(jiao)高,應在(zai)注射成型(xing)后(hou)數分種內(nei)即松掉(diao)砂箱,以縮小到鑄件縮小水頭(tou)損(sun)失,并(bing)需要使鑄件在(zai)鑄型(xing)中_急(ji)冷后(hou)再打箱。
若在紅(hong)熱(re)(re)環境拆(chai)(chai)包,須立就是將鑄件(jian)移入(ru)(ru)700~800 ℃爐中(zhong)做(zuo)固溶(rong)處理;對于那些耐(nai)蝕鑄件(jian),由其熱(re)(re)導率低,線收斂大,具有(you)著明(ming)顯的熱(re)(re)裂趨勢,生產方式(shi)上常運用800~900 ℃ 時拆(chai)(chai)封,拆(chai)(chai)封后可以把妨礙鑄件(jian)優質收縮的砂(sha)芯、砂(sha)型及澆冒口(kou)系統的保(bao)住,大件(jian)快遞(di)都(dou)投(tou)入(ru)(ru)熱(re)(re)砂(sha)坑中(zhong)緩冷(leng),中(zhong)、大件(jian)快遞(di)都(dou)投(tou)入(ru)(ru)熱(re)(re)加工(gong)爐中(zhong)消失內內應力。
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