摘要
冷镦机气缸原工艺采用冷冒口,导致缩孔和缩松产生,根据球铁的凝固特性,利用呋喃树脂砂型刚度较高的特点,改用无冒口铸造工艺,主要改进措施是:(1)采用顶注开放式环形浇注系统;(2)在内浇道附近和铸件两壁交接部位设置冷铁;(3)铸件顶面增设排气冒口,以利排气。经过批量生产验证,铸件没有出现缩孔和缩松缺陷,也没有发生冲砂和气孔。
The cold riser was used in the former casting method to produce the upsetter cylinder,and as the result,the shrinkage cavities and porosities were caused.Based on the solidification characteristics of the nodular iron,by using the advantage of relatively high rigidity of the furan resin sand mold,it was decided to use the riserless casting method.The main improvements were as follows：（1）adopting circle-shaped non-pressured top gating system;（2）setting chills at locations near to the ingates and junction location of two walls of the casting;（3）setting venting risers to improve venting.The result of batch production proved that no shrinkage defects,no sand wash and blowhole defects.
出处
《现代铸铁》
CAS
2013年第4期39-41,共3页
Modern Cast Iron
关键词
气缸体
球墨铸铁
缩孔
缩松
cylinder body
nodular iron
shrinkage cavity
shrinkage porosities
