但這兩種清砂方法也有不足之處：噴砂清砂適用于較大油腔或油道敞開(kāi)的閥體，對(duì)結(jié)構(gòu)復(fù)雜、油道細(xì)小的閥孔等有較大的局限性，不能有效去除粘砂，且對(duì)已加工表面較易造成破壞，故而影響密封性、美觀(guān)性和產(chǎn)品精度，且不利于加工工序的安排；電化學(xué)清砂對(duì)一些非循環(huán)腔而言很難有效去凈粘砂，且能耗較高，對(duì)環(huán)境破壞極大，工人的作業(yè)強(qiáng)度也高，故對(duì)復(fù)雜件的清砂大家還在探索之中。對(duì)于小型復(fù)雜鑄件的清砂，筆者介紹一種方法供大家參考：人工時(shí)效-酸洗-漂洗-防銹-超聲波清洗。
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為降低鋼水中碳含量，在精煉裝置中開(kāi)發(fā)了精煉新工藝。當(dāng)帶有金屬的罐進(jìn)入精煉爐后，通過(guò)底部多孔風(fēng)嘴以20m3/h的消耗量進(jìn)行提前3min吹氬，進(jìn)行溫度測(cè)量、提取金屬和鋼渣試樣，繼續(xù)利用夾送器按125g/tCa的計(jì)算量添加硅鈣合金絲。通過(guò)添加ФС75渣、0.4～0.7kg/t焦炭粉和石灰，造Fe0含量小于0.5%和堿度2.5～3.0的液態(tài)渣。當(dāng)?shù)玫焦拗薪饘僭嚇拥幕瘜W(xué)分析結(jié)果后，再加入鐵合金及其他合金。第二次按125g/tCa加入硅鈣合金絲，進(jìn)行終脫氧，但不早于精煉結(jié)束前5min。
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