铸铁件N2孔的原因分析及防止
Nitrogen Fissure Reason Analysis and Prevention of Iron Castings
刘畅 1庞争群 1赵学清 1吴大春 1刘洋 1洪恒发 1杨欣1
作者信息
- 1. 东风汽车股份有限公司 铸造分公司,湖北襄阳441004
- 折叠
摘要
分析了6B缸体铸件的生产条件及缺陷特征,确认其缺陷是裂隙状N2孔.指出呋喃树脂w(N)量高、砂芯排气不畅及铁液中溶解N过高是导致裂隙状N2孔的主要原因,并提出了解决措施,主要是:(1)使用低N呋喃树脂;(2)芯砂中加入Fe2O3粉或使用含Fe2O3粉的涂料;(3)加强砂芯的排气;(4)在孕育剂中增加N的稳定元素Zr,使Zr和N生成稳定的氮化物,从而降低溶解N的浓度.
Abstract
The production conditions and defect characteristics of 6B model engine block were analyzed,and it was confirmed that its defect is nitrogen fissure.It was pointed out that the high nitrogen content of the furan resin,poor venting of the sand cores and too high content of nitrogen dissolved in the iron melt were the main reasons causing the nitrogen fissure.The solution measures were proposed included mainly:(1)using furan resin having low content of nitrogen; (2)adding Fe2O3 powder into core sand or using Fe2O3 containing coating; (3)improving venting of the cores; (4)adding nitrogen-stabilizing element Zr into the inoculant to make the nitrogen and nitrogen to form stable compound and thereby to decrease the concentration of nitrogen dissolved in the iron melt.
关键词
N2孔/低N树脂/砂芯排气/氮化物Key words
nitrogen fissure/low nitrogen content resin/cores venting/nitrogen compound引用本文复制引用
出版年
2013
NETL
NSTL
维普
万方数据