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id="folawda" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="rqiactv" class="box"><p><p> 球墨鑄鐵件常見缺點(diǎn)的分析與對策球鐵是近40年來我國發(fā)展起來的重要鑄造金屬材料。由于球狀石墨造成的應(yīng)力集中小，對基體的割裂作用也較小，故球鐵的抗拉強(qiáng)度，塑性和韌性均高于其他鑄鐵。與相應(yīng)組織的鋼相比，塑性低于鋼，疲勞強(qiáng)度接近一般中碳鋼，屈強(qiáng)比可達(dá)07～08，幾乎是一般碳鋼的2倍，而成本比鋼低，因此其應(yīng)用日趨***。當(dāng)然，頭屯河區(qū)球墨鑄鐵管推薦，球鐵也不是十全十美的，它除了會產(chǎn)生一般的鑄造缺點(diǎn)外，頭屯河區(qū)球墨鑄鐵管推薦，還會產(chǎn)生一些特有的缺點(diǎn)，如縮松、夾渣、皮下氣孔、球化不良及衰退等。這些缺點(diǎn)影響鑄件性能，頭屯河區(qū)球墨鑄鐵管推薦，使鑄件廢品率增高。為了防止這些缺點(diǎn)的發(fā)生，有必要對其進(jìn)行分析，總結(jié)出各種影響因素，提出防止措施，才能有效降低缺點(diǎn)的產(chǎn)生，提高鑄件的力學(xué)性能及生產(chǎn)效益。本文將討論球鐵件的主要常見缺點(diǎn):縮孔、縮松、夾渣、皮下氣孔、石墨漂浮、球化不良及球化衰退。1縮孔縮松(1)碳當(dāng)量：提高碳量，增大了石墨化膨脹，可減少縮孔縮松。此外，提高碳當(dāng)量還可提高球鐵的流動性，有利于補(bǔ)縮。生產(chǎn)質(zhì)量鑄件的經(jīng)驗(yàn)公式為Ｃ%+1/7Ｓｉ%>39%。但提高碳當(dāng)量時，不應(yīng)使鑄件產(chǎn)生石墨漂浮等其他缺點(diǎn)。(2)磷：鐵液中含磷量偏高，使凝固范圍擴(kuò)大，同時低熔點(diǎn)磷共晶在***凝固時得不到補(bǔ)給，以及使鑄件外殼變?nèi)酢０⒗仗╇x心球墨鑄鐵管哪家好。頭屯河區(qū)球墨鑄鐵管推薦</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="頭屯河區(qū)球墨鑄鐵管推薦,球墨鑄鐵管" src="http://tyunfile.71360.com/UpLoadFile/jhhsm/2019/6/636959543149289467/6369595431492894676091816.jpg"></div><p> 縮孔縮松球墨鑄鐵由於其糊狀凝固的特徵決定所生產(chǎn)的鑄鐵由於補(bǔ)縮不良經(jīng)常產(chǎn)生縮孔、縮松等缺點(diǎn)，為了能在鑄件生產(chǎn)以前預(yù)測這些缺點(diǎn)情況，早在印年代國內(nèi)外就開展了鑄造過程數(shù)值類比。鑄造過程數(shù)值類比是使用數(shù)值類比技術(shù)，在計算機(jī)虛擬的環(huán)境下類比實(shí)際鑄件形成過程，包括金屬液體的充型過程、冷卻凝固過程、應(yīng)力形成過程、判斷成型過程中主要原素的影響程度，預(yù)測組織、性能和可能出現(xiàn)的缺點(diǎn)，為優(yōu)化工藝減少廢品提供依據(jù)。1962年丹麥的Forsund***個采用電子計算機(jī)類比鑄件的凝固過程，此后美國、英國、德國、日本、法蘭西等相繼開展了這方面的研究。我國于70年代末開始，大連理工大學(xué)、沈陽鑄造研究所率先在我國開展了這一技術(shù)的研究，并分別于1980年發(fā)表了研究報告(郭可韌等，大型鑄件凝固過程的數(shù)字類比，大連工學(xué)院學(xué)報，1980(2)1─16;沈陽鑄造研究所，鑄件凝固熱場電子計算機(jī)類比，鑄造，此后在我國高等院校投入大量人力開展了這項(xiàng)研究。在"六五"、"七五"期間國家攻關(guān)項(xiàng)目中部有計算機(jī)在鑄造中應(yīng)用的攻關(guān)項(xiàng)目，"六五"的項(xiàng)目為"大型鑄鋼件凝固控制"、"七五"項(xiàng)目為"大型鑄鋼件鑄造工藝CAD"，組織產(chǎn)、學(xué)、研聯(lián)合攻關(guān)，**推展了此項(xiàng)技術(shù)在我國的發(fā)展。烏魯木齊球墨鑄鐵管規(guī)格阿克蘇球墨鑄鐵水篦子規(guī)格。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="頭屯河區(qū)球墨鑄鐵管推薦,球墨鑄鐵管" src="http://tyunfile.71360.com/UpLoadFile/jhhsm/2019/6/636973165956074490/6369731659560744903324287.jpg"></div><p> 在鎂蒸汽的帶動下，使石墨漂浮到鑄件上部。碳當(dāng)量越高，石墨漂浮現(xiàn)象越嚴(yán)重。應(yīng)當(dāng)指出，碳當(dāng)量太高是產(chǎn)生石墨漂浮的主要原因，但不是***原因，鑄件大小、壁厚也是影響石墨漂浮的重要因素。(2)硅：在碳當(dāng)量不變的條件下，適當(dāng)降低含硅量，有助于降低產(chǎn)生石墨漂浮的傾向。(3)稀土：稀土含量過少時，碳在鐵液中的溶解度會降低，鐵液將析出大量石墨，加重石墨漂浮。(4)球化溫度與孕育溫度：為了提高鎂及稀土元素的吸收率，國內(nèi)試驗(yàn)研究表明，球化處理時**適當(dāng)?shù)蔫F液溫度是1380～1450℃。在此溫度區(qū)間，隨著溫度升高，鎂和稀土的吸收率增加。(5)澆注溫度：一般情況下,澆注溫度越高，出現(xiàn)石墨漂浮的傾向越大，這是因?yàn)殍T件長時間處于液態(tài)有利于石墨的析出。Ｗ.Ｗ.Ｃhaput研究發(fā)現(xiàn),若縮短凝固時間，隨著澆注溫度升高，石墨漂浮傾向降低。(6)滯留時間：孕育處理后至澆注完畢之間的停留時間太長，為石墨的析出提供了條件，一般這段時間應(yīng)控制在10ｍｉｎ以內(nèi)。32防止措施(1)控制鐵液成分：嚴(yán)格控制碳當(dāng)量，不得大于46%；鐵液的含碳量不得大于40%，可用廢鋼來調(diào)整鐵液的含碳量；采用低硅(<12%)生鐵；改進(jìn)孕育處理，增強(qiáng)孕育效果，這樣可降低孕育硅鐵量。。</p><p> 降低殘留鎂量(<007%)；采用稀土鎂合金來處理，稀土氧化物殘余量控制在002%～004%。(2)工藝設(shè)計要確保鑄件在凝固中能從冒口不斷地補(bǔ)充高溫金屬液，冒口的尺寸和數(shù)量要適當(dāng)，力求做到順序凝固。(3)必要時采用冷鐵與補(bǔ)貼來改變鑄件的溫度分布，以利于順序凝固。(4)澆注溫度應(yīng)在1300～1350℃，一包鐵液的澆注時間不應(yīng)超過25ｍｉｎ，以免產(chǎn)生球化衰退。(5)提高砂型的緊實(shí)度，一般不低于90；撞砂均勻，含水率不宜過高，保證鑄型有足夠的剛度。2夾渣(1)硅：硅的氧化物也是夾渣的主要組成部分，因此盡可能降低含硅量。(2)硫：鐵液中的硫化物是球鐵件形成夾渣缺點(diǎn)的主要原因之一。硫化物的熔點(diǎn)比鐵液熔點(diǎn)低，在鐵液凝固過程中，硫化物將從鐵液中析出，增大了鐵液的粘度，使鐵液中的熔渣或金屬氧化物等不易上浮。因而鐵液中硫含量太高時，鑄件易產(chǎn)生夾渣。球墨鑄鐵原鐵液含硫量應(yīng)控制在006%以下，當(dāng)它在009%～0135%時，鑄鐵夾渣缺點(diǎn)會急劇增加。(3)稀土和鎂：近年來研究認(rèn)為夾渣主要是由于鎂、稀土等元素氧化而致，因此殘余鎂和稀土不應(yīng)太高。(4)澆注溫度：澆注溫度太低時，金屬液內(nèi)的金屬氧化物等因金屬液的粘度太高，不易上浮至表面而殘留在金屬液內(nèi)；溫度太高時。阿克蘇球墨鑄鐵水篦子要多少錢。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="頭屯河區(qū)球墨鑄鐵管推薦,球墨鑄鐵管" src="http://tyunfile.71360.com/UpLoadFile/jhhsm/2019/6/636959543241897858/6369595432418978587567592.jpg"></div><p> 如木屑等。(4)合理設(shè)計澆注系統(tǒng)，使之為開放式，可在型腔的比較高處設(shè)置出氣孔，同時應(yīng)保證澆冒口高度，以提高液態(tài)金屬的靜壓力。5球化衰退及球化不良(1)碳當(dāng)量：鐵液的碳當(dāng)量太高時(尤其是硅含量也高時)將使石墨球化受到影響。試驗(yàn)表明，對于厚壁鑄件，當(dāng)碳當(dāng)量超過共晶成分時就有可能產(chǎn)生開花狀石墨。但是提高鐵液的含碳量有利于鎂回收率的提高。因此生產(chǎn)中大多采用高碳低硅的原則，通常含硅量控制在2%左右。此外，碳當(dāng)量的選取還與鑄件壁厚有關(guān)：當(dāng)壁厚為～76ｍｍ時，碳當(dāng)量為～；當(dāng)壁厚>76ｍｍ，碳當(dāng)量為～。(2)硫:當(dāng)鐵液中的含硫量太高時，硫與鎂和稀土生成硫化物，因其密度小而上浮到鐵液表面，而這些硫化物與空氣中的氧發(fā)生反應(yīng)生成硫，硫又回到鐵液，又重復(fù)上述過程，從而降低了鎂與稀土含量。當(dāng)鐵液中的硫大于，即使加入多量的球化劑，也不能使石墨完全球化。(3)稀土與鎂:稀土與鎂含量過低時，往往產(chǎn)生球化不良或球化衰退現(xiàn)象。一般工廠要求球化劑的加入量為～。(4)壁厚：鑄件壁太厚也容易產(chǎn)生球化不良及衰退缺點(diǎn)，主要是因?yàn)殍F液在鑄型中長時間處于液態(tài)，鎂蒸汽上浮，造成鎂含量降低；共晶時大量石墨生成而釋放出的結(jié)晶潛熱使奧氏體殼重新熔化。阿勒泰專業(yè)球墨鑄鐵管哪家好。頭屯河區(qū)球墨鑄鐵管推薦公司</p><p style="text-indent:25px"> 阿克蘇球墨鑄鐵水篦子直銷。頭屯河區(qū)球墨鑄鐵管推薦</p><p> 下面的幾張球墨鑄鐵管腐蝕失效的照片是這個報告中的附圖。高質(zhì)量生產(chǎn)的球墨鑄鐵管基本能夠滿足輸水管道的一般應(yīng)用。而質(zhì)量管控差的鑄管企業(yè)生產(chǎn)的球墨鑄鐵管基本上與手工防腐鋼管相差無幾。因此，不要以為球墨鑄鐵管就一定比鋼管耐腐蝕。當(dāng)電阻率小于100歐姆米時，美國墾務(wù)局（類似于國內(nèi)水務(wù)公司）建議普通防腐的球墨鑄鐵管采取陰極保護(hù)，而重防腐（聚合物涂層）球墨鑄鐵管當(dāng)土壤電阻率小于25歐姆米時也需要陰極保護(hù)（參見CorrosionConsiderationsforBuriedMetallicWaterPipe2004）。新興鑄管在文章和報告中用工廠生產(chǎn)的球墨鑄鐵管與國內(nèi)手工防腐（外防腐為三油兩布，內(nèi)防腐為水泥砂漿或IPN8710涂料）的輸水鋼管做比較，一個是工廠程序化機(jī)械生產(chǎn)，質(zhì)量管控嚴(yán)格的的球墨鑄鐵管，另一個是手工操作，防腐質(zhì)量無法把控的輸水鋼管。由于加工手段不同，雖然它們采用的防腐材料基本相同，但實(shí)際防腐效果相差甚遠(yuǎn)。不過從另一方面提醒我們，除了現(xiàn)場補(bǔ)口施工，手工防腐的輸水鋼管應(yīng)當(dāng)***禁止生產(chǎn)和使用。球墨鑄鐵管防腐形式除了常規(guī)的內(nèi)襯水泥砂漿和管外噴涂瀝青外還有其它多種防腐，重防腐為內(nèi)外噴涂環(huán)氧或聚氨酯。而新型的輸水鋼管內(nèi)外防腐通常為聚氨酯。頭屯河區(qū)球墨鑄鐵管推薦</p><p style="text-indent:25px">行路致遠(yuǎn)，砥礪前行。新疆錦宏皓商貿(mào)有限公司致力成為與您共贏、共生、共同前行的戰(zhàn)略伙伴，更矢志成為機(jī)械及行業(yè)設(shè)備富有影響力的企業(yè)，與您一起飛躍，共同成功！</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/1039129.html</p></div></div></div></div></div><div id="ckceli8" class="page-right twoColRt"><div 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