Influence of Gas Replacement in Foamed Pattern on Pattern Decomposition and Mold Filling Rate in Evaporative Pattern Casting Process of Iron Castings
Influence of Gas Replacement in Foamed Pattern on Pattern Decomposition and Mold Filling Rate in Evaporative Pattern Casting Process of Iron Castings
复制标题
铸铁件消失模铸造过程中泡沫模型中气体置换对模型分解和铸型填充率的影响
DOI：
10.11279/jfes.94.748
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
丸山 徹
中科院分区：
文献类型：
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作者：
児濱 司樹;藤野 茂;丸山 徹
为了减少聚苯乙烯泡沫模型中的空气量，我们用氩气代替模型中的气体，然后测量了铁水消失模铸造中的模型分解率和模具填充率。图案中的气体置换是通过将图案放入减压下的真空容器后，将图案保持在氩气氛中来进行的。发现气体置换后模型中的空气量随着在减压和氩气气氛中保持时间的增加而减少。刚浇注后的图案分解率具有随着减压下及氩气氛中的保持时间的增加而增加的倾向，但随着浇注后时间的延长，分解速度减慢，热分解气层厚度增加。在充模初期，随着气体置换时氩气气氛保持时间的增加，充模速率趋于加快，而随着熔融金属流动长度的延长，充模速率趋于变慢。当在气体置换之后涂覆图案时，图案的分解速率比在气体置换之前涂覆图案时更慢，这表明在没有涂覆的情况下，气体置换效率更高。
In order to decrease the amount of air in a polystyrene foam pattern, we replaced the gas in the pattern with argon, and then measured the pattern decomposition rate and mold filling rate in the evaporative pattern casting of molten cast iron. The gas substitution in the pattern was performed by keeping the pattern in an argon atmosphere after the pattern was placed in a vacuum vessel under reduced pressure. The amount of air in the pattern after gas substitution was found to decrease with increasing holding times at reduced pressure and in an argon atmosphere. The pattern decomposition rate immediately after pouring tended to increase with increasing holding times at reduced pressure and in the argon atmosphere, however the decomposition rate slowed down and the thermal decomposition gas layer thickness increased with increasing time after pouring. In the initial stage of the mold filling, the mold filling rate tended to be faster with increasing argon atmosphere holding time during gas substitution, and slower with longer flow length of the molten metal. The decomposition rate of the pattern was slower when the pattern was coated after gas substitution than when the pattern was coated before gas substitution, suggesting that gas substitution efficiency is higher without coatings.