论文部分内容阅读
通过对某涡轮泵壳体涡道内腔“黑线”缺陷进行成分及组织分析,确认为氧化铝夹杂。应用铸造过程数值模拟分析技术,对氧化膜的破碎卷入过程进行了分析,得到氧化膜夹杂的形成和分布受壳体铸件的结构特点影响和决定,高压腔涡道顶部出现“黑线”是个普遍现象,不可避免。提出一种控制充型合金液温度来控制“黑线”的长度和深度的方法,达到控制“黑线”缺陷的目的。实验结果表明,通过对坩埚起吊时间控制及浇注温度的保证,壳体黑线氧化膜夹层数量及长度大幅减少,通过挠削等方式即可消除,使壳体“黑线”报废率大幅度降低。
By analyzing the composition and microstructure of the vortex chamber “black line ” defect of a turbine pump shell, it was confirmed that the alumina inclusions. The casting process numerical simulation analysis technology was used to analyze the process of oxide film crushing and entangling. The formation and distribution of oxide film inclusion were influenced and decided by the structural characteristics of the shell casting. The “black line ”It is a common phenomenon, inevitable. A method to control the length and depth of “black line ” to control the temperature of filling liquid alloy is proposed to achieve the purpose of controlling “black line ” defects. The experimental results show that by controlling the crucible lifting time and the pouring temperature, the number and length of the black oxide film interlayer in the shell are greatly reduced and can be eliminated by means of bending and the like, so that the rejection rate of the shell "black line The rate of decrease.