(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 哈爾濱 150001)
摘 要: 對Ti合金立式離心鑄件的充填和凝固過程進(jìn)行研究。 結(jié)果發(fā)現(xiàn)， 在離心場下， 柯氏力對熔體運(yùn)動方向的改變影響非常大， 熔體沿著與旋轉(zhuǎn)方向相對的型壁進(jìn)行正向加速充填， 當(dāng)達(dá)到最遠(yuǎn)端后反向充填。 在正向充填過程中， 對沒有內(nèi)澆道的鑄型， 熔體在橫澆道內(nèi)的截面面積隨充填長度的增加而逐漸減小， 當(dāng)橫澆道側(cè)壁存在內(nèi)澆道時， 熔體通過內(nèi)澆道進(jìn)入型腔， 導(dǎo)致熔體在內(nèi)澆道入口處產(chǎn)生速度降， 熔體橫截面面積在該處有所回升， 然后隨充填長度的增加而減少。 同時， 旋轉(zhuǎn)方向?qū)τ袃?nèi)澆道鑄型的充填順序影響非常大。
關(guān)鍵字: Ti合金； 石墨型； 立式離心鑄造； 截面面積
BI Wei-sheng, FU Heng-zhi
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract: The filling and solidification of titanium alloy melts in the vertical centrifugal filed were investigated. The results show that the coriolis force plays an important role in the change of melts flow direction. With the action of the centrifugal force and coriolis force, the melts stick one of side of the mould to fill and the side is opposite to the rotational direction. The whole filling process includes two filling parts: forward filling and back filling. During the forward filling process, the sectional area of the mould without the ingate decreases with the increase of filling length, but which is changeable with the increase of the filling length for the mould with ingate. The rotational direction plays an important role in the filling sequence of the mould with ingates.
Key words: titanium alloy; graphite mould; vertical centrifugal casting; sectional area
