埋管铸造成形油道孔的工艺试验
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摘要
针对砂型铸造中利用砂芯成形细长的油道孔容易出现断芯、烧结和清砂困难的问题,研究了预埋空心油道管和预埋油道管内填充铬矿砂成形铸钢件中细长油道孔的两种工艺方案,分析了预埋油道管与铸件界面结合状况、影响油道管熔合的因素以及油道管重量与热节部位重量的关系。结果表明:对于20～100 kg的铸件,采用预埋空心油道管可以有效解决断芯问题,而对于100～300 kg的铸件,采用预埋油道管内填充铬矿砂的工艺不仅可以解决预埋管熔穿的问题,还可以提高铸件的品质。
It's easy to cause blockage, core breaking, sintering and sand cleaning problem in sand mold casting by using sand core to form slender oil duct. In order to solve these problems, both casting processes were attempted.One was that the elongated oil hole in steel casting was formed by pre-embedded hollow oil duct, and the other was formed by the pre-embedded oil duct with chromite sand filled inside. The research also focused on studying the interface bonding between the pre-embedded oil duct and casting, the factors affecting the fusion of oil duct and the relationship between the pre-embedded oil duct weight and hot spot weight. The results indicate that the casting process of the pre-embedded hollow oil duct in sand mold can effectively solve the problem of core breaking for the castings with weight range from 20 kg to 100 kg; the casting process of the pre-embedded oil duct with chromite sand filled inside not only solve the problem of melt-through of preembedded oil duct, but also improve the quality of castings with weight range from 100 kg to 300 kg.
It's easy to cause blockage, core breaking, sintering and sand cleaning problem in sand mold casting by using sand core to form slender oil duct. In order to solve these problems, both casting processes were attempted.One was that the elongated oil hole in steel casting was formed by pre-embedded hollow oil duct, and the other was formed by the pre-embedded oil duct with chromite sand filled inside. The research also focused on studying the interface bonding between the pre-embedded oil duct and casting, the factors affecting the fusion of oil duct and the relationship between the pre-embedded oil duct weight and hot spot weight. The results indicate that the casting process of the pre-embedded hollow oil duct in sand mold can effectively solve the problem of core breaking for the castings with weight range from 20 kg to 100 kg; the casting process of the pre-embedded oil duct with chromite sand filled inside not only solve the problem of melt-through of preembedded oil duct, but also improve the quality of castings with weight range from 100 kg to 300 kg.
引文
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[2]梁学政,陆魁朝,韦东明.大断面藕筒辊的埋管铸造[J].铸造,1997(8):41.
[3]郭跃广,刘波,刘秋荣.扁状拐弯深盲孔消除粘砂的工艺实践[J].铸造技术,2012(8):125-127.
[4]朱丽娟,王明娜,张喻,等.消失模铸造中盲孔及细深孔粘砂问题的解决途径[J].特种铸造及有色合金,2009,29(11):1040-1041.
[5]陈宗民,于文强.铸造金属凝固原理[M].第二版.北京:北京大学出版社,2016:88-90.
[6]HwangHo-Young,NamCheol-Hee,Choi Young-Sim,etal. Astudyoneffectsofceramicfoamfilteronflowaspectthroughwater modeling experiment[J]. China Foundry,2017,3(3):216-225.
[7]Kwak S Y,Hwang H Y,Cho C. Thermal stress analysis method considering geometric effect of risers in sand mold casting process[J].China Foundry,2014,6(1):531-536.
[8]王文清,李魁盛.铸造工艺学[M].北京:机械工业出版社,1998:326-329.
[9]李维乔.铸造深孔的经验[J].机械工人,1985(1):30-32.
[10]沈宏谋.铸件深孔的铸造[J].现代铸造,2007(6):26-29.
[11]李晨希.铸造工艺及工装设计[M].第一版.北京:化学工业出版社,2014:230-231.
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