充型方式对高铬铸铁磨球气孔缺陷的影响  

Influence of Filling Modes on Blowhole Defects of High Chromium Cast Iron Grinding Ball

作　　者：贺国强[1] 

机构地区：[1]金堆城钼业集团有限公司机电修配厂,陕西华县714102

出　　处：《铸造》2008年第6期627-628,631,共3页Foundry

摘　　要：针对高铬铸铁磨球在生产过程中心部和表面产生气孔缺陷的问题,对比分析了一模一球和一模四球两种模具的不同充型方式对气孔缺陷的影响。结果表明,中注式充型的一模四球模具排气能力强,充型时铁液冲击力较小,充型相对平稳,不易卷入气体,优于顶注式充型的一模一球模具。对于碳化物呈(Cr,Fe7)C3型的高铬铸铁磨球而言,采用一模四球模具生产,可以消除磨球的气孔缺陷。To solve the problem of the blowhole defects in the center and on the surface of the high chromium cast iron grinding ball, the influence of the two filling modes-one-ball mold and four-ball mold on blowhole defects was analyzed. The result indicated that the venting effect of the four-ball mold with parting-line gating system is better, the impact of liquid iron is smaller, and the filling is relatively steady as compared with that of the one-ball mold with top gating system, therefore the gas is not easy to be entrapped. So for high chromium cast ron grinding ball whose carbide is （Cr, Fe） 7C3 the blowhole defects could be eliminated using the four-ball mold with parting-line gating system.

关 键 词：充型方式 高铬铸铁 磨球 气孔缺陷 

分 类 号：TG245[金属学及工艺—铸造]