消除弯管铸件的渗漏和气孔缺陷的措施

Measures to Remove Leakage and Blowhole Defects of Elbow Pipe

针对弯管铸件原工艺出现的渗漏和气孔缺陷,对原工艺进行了改进。通过在底部法兰盘两侧设置边暗冒口和在法兰盘下面增加冒口补贴,使铸件实现顺序凝固,消除铸件的缩松缺陷。在下法兰盘两边冒口上增设两个内浇道,使金属液平稳进入型腔,避免带入气体,并将浇注温度由1 550℃提高到1 575℃,以及增设边冒口的气眼等措施,消除了铸件气孔缺陷。经生产验证,铸件成品率大大提高。

The original process of elbow pipe casting was improved, because of leakage and blowhole of casting. In order to remove the defects, realize directional solidification of casting, the side closed riser was set on the two sides of base flange and riser allowance was put under the flange, so the dispersed shrinkage was removed. The ingate was put on the riser, the melt iron enters into mold smoothly and steadily, the gas was avoided entering into mould. The temperature was increased from 1550 ℃ to 1575 ℃, the side riser air vent was installed, the blowhole was removed, the production was verified, the yield of casting was increased.